A cold header

Abstract

The present application relates to the technical field of cold header, and particularly discloses a cold header. The cold header comprises a bed body, a feeding unit, a cutting unit and a transmission unit are installed on the bed body, a main sliding table is slidingly connected to the bed body, and a main die box is fixedly connected to the bed body, the transmission unit is used for driving the main sliding table to slide on the bed body, the main die box is oppositely arranged to the main sliding table, when the transmission unit drives the main sliding table to reciprocally slide on the bed body, the cut-off bar between the main sliding table and the main die box is cold headed. The transmission unit comprises a first connecting rod, a second connecting rod and a pushing rod, the first connecting rod, the second connecting rod and the pushing rod form a "Y" shape or a "I" shape structure, when the main crankshaft rotates, the front die installed on the main sliding table can cold head the bar for a longer time, so that the qualified rate of the bar is improved.

Description

Technical Field

[0001] This invention relates to the field of cold heading machines, and particularly to a cold heading machine. Background Technology

[0002] A cold heading machine is a stamping machine used in mechanical manufacturing to shape raw materials into the required shape without altering their shape. When cold heading bar stock, the cold heading time, i.e., the time the die extrudes the bar stock, should be minimized to ensure that the dimensions of parts produced in the same batch are relatively uniform.

[0003] For example, the front-exit device of a cold heading machine disclosed in application document CN 215697700U uses a common cold heading machine transmission device. This transmission device consists of an input motor, a crankshaft, and a pusher connecting rod rotatably connected to the crankshaft. The crankshaft rotation drives the pusher connecting rod to move the slide table left and right, causing the die mounted on the slide table to press the cut bar stock, shaping it into the desired form. However, when cold heading the bar stock using this transmission unit, the slide table stays near the bar stock for a short time, resulting in a short pressing time for the bar stock. This leads to dimensional differences in parts produced in the same batch, such as bolts or nuts, making it difficult to control the quality of parts from the same batch.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] This invention discloses a cold heading machine to improve the problem of quality differences in the same batch of bar stock during the cold heading process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A cold heading machine, comprising:

[0008] Bed frame;

[0009] The feeding unit, mounted on the bed, is used to convey bar stock;

[0010] The cutting unit, mounted on the machine bed, is used to cut the bar stock conveyed to the machine bed by the feeding unit.

[0011] The main slide and the main mold box are positioned opposite each other, with the main slide slidably connected to the bed and the main mold box fixedly connected to the bed.

[0012] The transmission unit includes:

[0013] The main crankshaft is rotatably connected to the bed and is connected to an external motor drive.

[0014] The first connecting rod is rotatably connected at one end to the eccentric portion of the main crankshaft;

[0015] The first connecting shaft is fixedly connected to the bed frame;

[0016] The second link is positioned above the first link, and one end of the second link is rotatably connected to the first connecting shaft;

[0017] A second connecting shaft, the other end of the first connecting rod being rotatably connected to the second connecting shaft; and the other end of the second connecting rod being rotatably connected to the second connecting shaft; and

[0018] The pusher connecting rod has one end rotatably connected to the second connecting shaft and the other end rotatably connected to the main slide table. The pusher connecting rod is used to push the main slide table to slide relative to the bed. The main slide table is used to cold head the bar stock close to the main mold box.

[0019] The clamping unit, mounted on the bed, is used to clamp the bar stock to different workstations.

[0020] Preferably, when the second connecting shaft is located below the first connecting shaft, the first connecting rod, the second connecting rod, and the pusher connecting rod form a "Y" shaped structure.

[0021] Preferably, when the second connecting shaft is located above the first connecting shaft, the first connecting rod, the second connecting rod, and the pusher connecting rod form a "U" shaped structure.

[0022] Preferably, the clamping unit includes:

[0023] The crankshaft extends out and is rotatably connected to the bed, where it is driven by the main crankshaft.

[0024] A long drive shaft is rotatably connected to the bed and is drively connected to the through crankshaft. A clamping rocker arm cam is provided on the long drive shaft.

[0025] A flip-grip assembly, mounted on the bed, is used to clamp bar stock;

[0026] One end of the clamp connecting rod is connected to the flip clamp assembly;

[0027] The clamp rocker arm is rotatably connected to the bed in the middle. One end of the clamp rocker arm abuts against the clamp rocker arm cam, and the other end is rotatably connected to the other end of the clamp connecting rod.

[0028] Preferably, the feeding unit includes:

[0029] A mounting base is installed on the bed, and the mounting base is provided with a first mounting hole and a first limiting hole, with the first mounting hole located directly below the first limiting hole;

[0030] An active drive structure includes a drive gear, a first rotating shaft, and a first feeding wheel. The drive gear and the first feeding wheel are coaxially fixedly connected to the first rotating shaft, and the first rotating shaft is rotatably installed in the first mounting hole.

[0031] The first driven structure includes a first driven gear, a second rotating shaft, a first mounting box, and a second feeding wheel. The second rotating shaft is rotatably connected to the first mounting box. The first mounting box passes through the first limiting hole and is slidably connected to the mounting base. The first driven gear and the second feeding wheel are coaxially fixedly connected to both ends of the second rotating shaft. The first driven gear meshes with the driving gear. The first feeding wheel and the second feeding wheel cooperate to convey bar stock.

[0032] The first support rod has one end fixedly connected to the mounting base and the other end rotatably connected to the first mounting box;

[0033] A first cylinder is mounted on the mounting base. The first cylinder is used to drive the first mounting box to rotate around the first support rod, so that the driving gear is separated from the first driven gear.

[0034] A stop and a controller are provided. The stop is set on the path of the bar stock movement and is used to adjust the length of the feed bar stock. A pressure sensor is set on the stop. The first cylinder, the pressure sensor and the controller are communicatively connected.

[0035] Preferably, the cutting unit includes:

[0036] Two lugs are fixedly connected to one side of the bed. The two lugs are arranged opposite each other, and a coaxial circular through hole is provided on the opposite side of the two lugs. A copper sleeve is installed in the through hole.

[0037] A cutting structure is disposed between the two lugs:

[0038] A round cutting rod is slidably connected inside the copper sleeve, used to drive the cutting structure to approach and cut the bar stock;

[0039] A first elastic element is mounted on the bed, and the first elastic element is used to drive the cutting structure away from the bar stock;

[0040] The cutter connecting rod is eccentrically rotatably connected to the main crankshaft at one end, and rotatably connected to the cutter rod at the other end.

[0041] Preferably, the cold heading machine further includes a first ejector unit, the first ejector unit comprising:

[0042] The first top material rocker arm is rotatably connected to the bed in the middle;

[0043] The top material connecting rod is eccentrically rotatably connected to the through crankshaft at one end, and rotatably connected to the first top material rocker arm at the other end;

[0044] Multiple top material mounting plates are spaced apart and arranged on top of the top material rocker arm;

[0045] Multiple push rod bolts, each push rod bolt being installed one-to-one on the top material mounting plate; and

[0046] A push rod is slidably connected inside the main mold box, and the push rod is used to push the material out by being driven by the push rod bolt.

[0047] Preferably, the cold heading machine further includes a second ejector unit, the second ejector unit comprising:

[0048] The second top material rocker arm is rotatably connected to the bed at its middle part;

[0049] An ejector rod is slidably connected inside the main mold box. One end of the ejector rod is rotatably connected to one end of the second ejector rocker arm. The second ejector rocker arm is used to drive the ejector rod to reciprocate.

[0050] The ejector pin and the ejector mold are slidably connected in the main mold box. The ejector mold is used for ejecting material. One end of the ejector pin abuts against the ejector mold, and the other end abuts against the ejector rod.

[0051] The top material drive structure is connected to the transmission shaft and is used to drive the top material rocker arm to reciprocate.

[0052] Preferably, the transmission unit further includes a front-exit structure, the front-exit structure comprising:

[0053] A front-exit pressure plate is rotatably connected to the main slide table;

[0054] A front-exit cam is detachably mounted on the pusher linkage;

[0055] A front-exit rocker arm is rotatably connected to the main slide, and the front-exit rocker arm is located below the front-exit pressure plate;

[0056] A punch rod is slidably connected within the main slide. The front exit cam abuts against the front exit pressure plate. The front exit cam drives the front exit pressure plate to rotate. The front exit pressure plate abuts against the front exit rocker arm. The front exit pressure plate drives the front exit rocker arm to rotate. The front exit rocker arm drives the punch rod to move. The punch rod drives the front die to punch the workpiece.

[0057] Preferably, the transmission unit further includes a main slide spring rod, which is mounted on the bed and one end of the main slide spring rod is fixedly connected to the main slide.

[0058] Preferably, the transmission unit further includes a limiting structure, which includes a fixed side plate, an adjusting side plate, and an adjusting screw. The fixed side plate and the adjusting side plate respectively abut against the two sides of the main slide. The adjusting screw is threadedly connected to the bed and passes through the bed to abut against the adjusting side plate.

[0059] Preferably, the feeding unit further includes:

[0060] The feeding rocker arm is eccentrically rotatably connected at one end to the outlet crankshaft.

[0061] A swing arm, located on one side of the mounting base, is used to swing left and right by being driven by a feeding rocker arm;

[0062] A one-way bearing is disposed at one end of the first rotating shaft. The inner ring of the one-way bearing is connected to the keyway of the outer wall of the first rotating shaft, and the outer ring is fixedly connected to the rocker arm.

[0063] Preferably, the first support rod is close to the first driven gear, and the first cylinder is close to the second feed wheel.

[0064] Preferably, the feeding unit further includes a first compression spring, which is located near the second feeding wheel. One end of the first compression spring is mounted on the mounting base, and the other end is mounted on the bottom of the first mounting box.

[0065] Preferably, the mounting base is provided with a second mounting hole and a second limiting hole, the second mounting hole is located on one side of the first mounting hole, and the second limiting hole is located directly above the second mounting hole. The feeding unit further includes:

[0066] The second driven structure includes a second driven gear, a third rotating shaft and a third feeding wheel. The third rotating shaft is rotatably installed in the second mounting hole, and the second driven gear and the third feeding wheel are coaxially fixedly connected to both ends of the third rotating shaft.

[0067] The third driven structure includes a third driven gear, a fourth rotating shaft and a fourth feeding wheel. The fourth rotating shaft is installed in the second limiting hole, and the third driven gear and the third feeding wheel are coaxially fixedly connected to both ends of the fourth rotating shaft.

[0068] A transmission gear is rotatably connected to the mounting base. The transmission gear is disposed between the driving gear and the second driven gear, and the transmission gear meshes with the driving gear and the second driven gear respectively.

[0069] Preferably, the third driven structure further includes a second mounting box, and the feeding unit further includes a second support rod and a second cylinder;

[0070] The fourth rotating shaft is rotatably connected to the second mounting box, the second mounting box passes through the second limiting hole, the second mounting box is slidably connected to the mounting base, one end of the second support rod is fixedly connected to the mounting base, and the other end is rotatably connected to the second mounting box, the second cylinder is mounted on the mounting base, and the second cylinder is used to drive the second mounting box to rotate around the second support rod, so that the second driven gear is separated from the third driven gear.

[0071] Preferably, the second support rod is close to the third driven gear, and the second cylinder is close to the fourth feed wheel.

[0072] Preferably, the feeding unit further includes a second compression spring, which is close to the fourth feeding wheel. One end of the second compression spring abuts against the mounting base, and the other end abuts against the bottom of the second mounting box.

[0073] Preferably, the cutting structure includes a cutter holder and a cutter head, the cutter head passing through the side wall of the bed and slidably connected to the bed, and the cutter holder abutting against the cutting rod.

[0074] Preferably, the cutting rod has a first plane and a second plane, the distance between the first plane and the axis of the rod is greater than the distance between the second plane and the axis of the rod, and a cutting surface is provided between the first plane and the second plane, the cutting surface being used to abut against the blade holder.

[0075] Preferably, the cutter structure further includes an eccentric adjustment shaft, which is threadedly connected to the cutter holder. The eccentric adjustment shaft includes a shaft body and an eccentric portion, which is used to abut against the cutter rod.

[0076] Preferably, the first ejector unit further includes an ejector tube base plate and an ejector tube, the ejector tube base plate is mounted on the bed, the ejector tube is threadedly connected in the ejector tube base plate, and the ejector rod is slidably connected in the ejector tube.

[0077] Preferably, the inside of the ejector tube is provided with a second elastic element, which is used to drive the ejector rod to move toward the ejector bolt.

[0078] Preferably, the top material driving structure includes:

[0079] A vertical drive shaft is rotatably connected to the bed, and the vertical drive shaft is drively connected to the long drive shaft.

[0080] A camshaft is rotatably connected to the bed and is connected to the transmission vertical shaft. A top material cam is mounted on the camshaft and abuts against the top material rocker arm. The top material cam is used to drive the top material rocker arm to reciprocate.

[0081] Preferably, the second top-feeding unit further includes:

[0082] The top material rocker arm seat is mounted on the bed;

[0083] The drive block is rotatably connected to the top material rocker arm seat;

[0084] A connecting plate is disposed between the top material rocker arm and the drive block. One end of the connecting plate is rotatably connected to the drive block, and the other end is rotatably connected to one end of the top material rocker arm. The drive block abuts against the top material cam, and the top material cam is used to drive the drive block to swing.

[0085] Preferably, the second ejector unit further includes a second elastic element, which is installed inside the main mold box. One end of the second elastic element abuts against the main mold box, and the other end abuts against the ejector mold.

[0086] Preferably, the clamping unit further includes a clamping rocker arm spring rod, one end of which is mounted on the bed and the other end abuts against the upper part of the clamping rocker arm.

[0087] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0088] In a cold heading machine provided by this invention, one end of a first connecting rod in the transmission unit is eccentrically rotatably connected to the main crankshaft. A second connecting rod is positioned above or below the first connecting rod and rotatably connected to a first connecting shaft fixed to the machine bed. The other ends of both the first and second connecting rods are rotatably connected to the second connecting shaft. One end of a pusher connecting rod is rotatably connected to the second connecting shaft, and the other end is rotatably connected to the main slide. This allows the pusher connecting rod to drive the main slide to move left and right during the rotation of the first connecting rod, thereby realizing the cold heading operation of the bar stock. Simultaneously, when the bar stock is stamped using this structure, the bar stock remains near the bar stock for a longer period on the main slide, and the bar stock is compressed for a longer time. This results in higher uniformity of the bar stock after cold heading, thus improving product quality. Attached Figure Description

[0089] Figure 1 This is a first-view structural schematic diagram of a cold heading machine provided in an embodiment of the present invention;

[0090] Figure 2 This is a second-view structural schematic diagram of a cold heading machine provided in an embodiment of the present invention;

[0091] Figure 3 This is a first-view structural schematic diagram of the interior of a cold heading machine according to an embodiment of the present invention;

[0092] Figure 4 This is a second-view structural schematic diagram of the interior of a cold heading machine according to an embodiment of the present invention;

[0093] Figure 5 This is a schematic diagram of the structure of a transmission unit provided in an embodiment of the present invention;

[0094] Figure 6 This is a schematic diagram of the structure of a transmission unit provided in an embodiment of the present invention;

[0095] Figure 7 This is a schematic diagram of the first state of the transmission unit provided in an embodiment of the present invention;

[0096] Figure 8 This is a schematic diagram of the second state of the transmission unit provided in an embodiment of the present invention;

[0097] Figure 9 This is a schematic diagram of the third state of the transmission unit provided in an embodiment of the present invention;

[0098] Figure 10 A schematic diagram of the fourth state of the transmission unit provided in an embodiment of the present invention;

[0099] Figure 11 This is a cross-sectional structural schematic diagram of a transmission unit provided in an embodiment of the present invention;

[0100] Figure 12 This is a cross-sectional structural schematic diagram of a transmission unit provided in an embodiment of the present invention;

[0101] Figure 13 This is a schematic diagram of the first structure of a transmission unit during cold heading according to an embodiment of the present invention;

[0102] Figure 14 This is a schematic diagram of the second structure of the transmission unit during cold heading according to an embodiment of the present invention;

[0103] Figure 15 This is a schematic diagram of the first structure of the transmission unit in the prior art.

[0104] Figure 16 This is a schematic diagram of the second structure of the transmission unit in the prior art;

[0105] Figure 17 This is a schematic diagram of the structure of the first cold heading arc angle provided in an embodiment of the present invention;

[0106] Figure 18This is a schematic diagram of the structure of the second cold heading arc angle provided in an embodiment of the present invention;

[0107] Figure 19 This is a schematic diagram of the structure of a transmission unit with another combination provided in one embodiment of the present invention;

[0108] Figure 20 This is a schematic diagram of the connection between the feeding unit and the main crankshaft according to an embodiment of the present invention;

[0109] Figure 21 This is a schematic diagram of the feeding unit from a first perspective according to an embodiment of the present invention;

[0110] Figure 22 This is a schematic diagram of the feeding unit from a second perspective according to an embodiment of the present invention;

[0111] Figure 23 This is an exploded view of a feeding unit provided in an embodiment of the present invention;

[0112] Figure 24 This is a schematic diagram of the feeding state of a feeding unit provided in an embodiment of the present invention;

[0113] Figure 25 This is a schematic diagram of the feeding unit clamping bar stock according to an embodiment of the present invention;

[0114] Figure 26 This is a schematic diagram of the third driven structure provided in an embodiment of the present invention;

[0115] Figure 27 This is an enlarged view of the portion of the cutting unit mounted on the bed in one embodiment of the present invention;

[0116] Figure 28 This is a first structural schematic diagram of a cutting unit provided in an embodiment of the present invention;

[0117] Figure 29 This is a schematic diagram of the second structure of a cutting unit provided in an embodiment of the present invention;

[0118] Figure 30 This is a schematic diagram of the structure of an eccentric adjustment shaft provided in an embodiment of the present invention;

[0119] Figure 31 This is an exploded view of an eccentric adjustment shaft provided in an embodiment of the present invention;

[0120] Figure 32 This is a schematic diagram of the clamping unit and the second ejector unit provided in an embodiment of the present invention from a first perspective.

[0121] Figure 33This is a schematic diagram of the clamping unit and the second ejector unit from a second perspective according to an embodiment of the present invention;

[0122] Figure 34 This is a schematic diagram of the structure of the second top material unit provided in an embodiment of the present invention;

[0123] Figure 35 This is a schematic diagram of the first top material structure provided in an embodiment of the present invention;

[0124] Figure 36 for Figure 35 Enlarged view of part A in the diagram;

[0125] Figure 37 This is a cross-sectional view of a top material connecting rod provided in an embodiment of the present invention. Detailed Implementation

[0126] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0127] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0128] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0129] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0130] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0131] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0132] Example

[0133] A cold heading machine is a type of stamping machine used in mechanical manufacturing to shape annealed bars with low hardness into the required shape without any alteration.

[0134] During production, the cold heading machine cuts the bar stock and conveys it to the processing station. At this point, a transmission device drives the main slide, which houses the die, to move. The sliding of the main slide moves the die, thus stamping the bar stock. Combined with... Figure 15 and 13 The transmission device of a cold heading machine in the prior art, as shown in the front outlet device of a cold heading machine disclosed in application document CN 215697700U, comprises an input motor, a crankshaft a, and a push rod b rotatably connected to the crankshaft a. The input motor and crankshaft a are drively connected, and the input motor drives the crankshaft a to rotate. The crankshaft a is rotatably connected to the machine bed. The push rod b pushes a slide table c, which is slidably connected to the machine bed, to move left and right. The push rod b is eccentrically rotatably connected to the crankshaft a. When the crankshaft a rotates, the end of the push rod b connected to the crankshaft a will perform a circular motion around the axis of rotation of the crankshaft a. Figure 15 and Figure 16 As shown, at this time, the slide table c, which is connected to the other end of the push rod b, can slide in the left and right directions relative to the bed.

[0135] It should be noted that, for ease of understanding the rotation angle of crankshaft a, neither the input motor nor the bed is [specified]. Figure 15 and Figure 16 Draw it out in the middle.

[0136] contrast Figure 15 and Figure 16 During the rotation of crankshaft a, in the prior art, crankshaft a moves from... Figure 15 Rotate to the position shown. Figure 16 At the position shown, during the clockwise rotation of crankshaft a, Figure 15 and Figure 16 The diagram shows two critical positions during the rotation of crankshaft a. When crankshaft a rotates to... Figure 15 and Figure 16 When the crankshaft a reaches the specified position, the die begins cold heading of the bar stock. Figure 15 At the designated position, push rod b pushes slide c until the mold mounted on slide c just comes into contact with the bar stock. During the clockwise rotation of crankshaft a (crankshaft a from...), Figure 15 Position rotated to Figure 16 During the positioning process, the die completes the stamping of the bar stock, and... Figure 16 As shown, the mold and the bar stock are in contact.

[0137] crankshaft a from Figure 15 Rotate the position to Figure 16 When the crankshaft a is in the middle position, the rotation angle is α1. When the position of the crankshaft a falls within this angle, the mold on the slide table c performs cold heading on the bar stock. When the position of the crankshaft a is outside this angle, the mold on the slide table c moves away from the bar stock. α1 is named the first cold heading arc angle of the cold heading machine.

[0138] Therefore, this application discloses a cold heading machine, which includes a bed 100. A feeding unit 400 is installed on the bed 100 to convey bar stock into the bed 100. Downstream of the feeding unit 400, a cutting unit 500 is also installed on the bed 100. The cutting unit 500 is used to cut the bar stock fed into the bed 100 by the feeding unit 400. The bed 100 is also equipped with a transmission unit 200, a main slide table slidably connected thereto, and a main die box 900 fixedly connected thereto. The transmission unit 200 is used to drive the main slide table slidably connected to the bed 100 to slide. A front die 320 is installed on the main slide table. The main die box 900 is disposed opposite to the main slide table. When the transmission unit 200 drives the main slide table to slide back and forth on the bed 100, the cut bar stock between the main slide table and the main die box 900 is cold-headed. The bed 100 is also equipped with a clamping unit 600. After the bar stock is cut, the clamping unit 600 clamps the bar stock between the main slide and the main die box 900. After the cold heading is completed, the clamping unit 600 clamps the cold-headed bar stock out from between the main slide and the main die box 900 and then clamps the bar stock that has not been cold-headed between the main slide and the main die box 900.

[0139] Specifically, when multiple processing stations are set on the main mold box 900, the clamping unit 600 clamps the bar stock from one station to another in sequence.

[0140] Reference Figure 5The transmission unit 200 disclosed in this application includes a main crankshaft 210, which is used for transmission connection with a motor. A first connecting rod 220 is rotatably connected to the eccentric portion of the main crankshaft 210. One end of the first connecting rod 220 is rotatably connected to the main crankshaft 210, and the other end is rotatably connected to one end of a second connecting rod 240. A third connecting rod 260 is also rotatably connected at the connection between the first connecting rod 220 and the second connecting rod 240. One end of the third connecting rod 260 is rotatably connected to the other end of the first connecting rod 220, and the other end of the third connecting rod 260 is rotatably connected to a main slide 300.

[0141] Combination Figure 5-8 When the main crankshaft 210, which is connected to the motor drive, rotates, the first connecting rod 220, which is rotatably connected to the main crankshaft 210 at one end, will undergo the following operation: Figure 5-8 The rotation demonstrated in the diagram causes the first link 220 to drive the third link 260 to move, which in turn drives the main slide table 300 to reciprocate approximately, thereby achieving the cold heading of the bar stock.

[0142] like Figure 5-8 As shown, the first link 220, the second link 240, and the third link 260 form a "Y"-shaped elbow drive structure. (Settings...) Figure 5 The initial position of the transmission unit 200 is such that when the main crankshaft 210 rotates clockwise, the main crankshaft 210 moves from... Figure 5 The positions are rotated sequentially to Figure 6 , Figure 7 and Figure 8 After repositioning, the main crankshaft 210 returns to its original position. Figure 5 The location.

[0143] Combination Figure 5-8 As shown, during the rotation of the main crankshaft 210, the main slide 300, which is connected to the third connecting rod 260, will move left and right, thereby enabling the front mold 320 mounted on the main slide 300 to stamp the bar stock.

[0144] Combination Figure 10 and Figure 11 When the main crankshaft 210 rotates to the position shown in the image Figure 10 At the position shown, the front mold 320, mounted on the main slide 300, initially abuts against the workpiece. The main crankshaft 210 moves from... Figure 10 As the indicated position continues to rotate clockwise, the front die 320 mounted on the main slide 300 presses the bar stock until the main crankshaft 210 rotates to the position shown. Figure 11 When the position shown is such that the front mold 320 mounted on the main slide 300 is in a critical contact state with the workpiece, that is, after the main crankshaft 210 rotates clockwise, the front mold 320 will detach from the workpiece.

[0145] Main crankshaft 210 from Figure 10Rotate the position to Figure 11 When the main crankshaft 210 is in the middle position, the rotation angle is α2. When the position of the main crankshaft 210 falls within this angle, the front mold 320 mounted on the main slide 300 cold heads the bar stock. When the position of the main crankshaft 210 is outside this angle, the front mold 320 on the slide is away from the bar stock. α2 is named the second cold heading arc angle of the cold heading machine.

[0146] To facilitate observation of the rotation angle of the main crankshaft 210, blind holes have been incorporated into both existing technologies and the crankshaft of this application. (See figures 14 and...) Figure 15 The angle of blind hole rotation can clearly determine the magnitude of the first cold heading arc angle and the second cold heading arc angle.

[0147] like Figure 14 and Figure 15 As shown, the second cold heading arc angle in this application is significantly larger than the first cold heading arc angle in the prior art. This means that the transmission unit in this application can ensure that the front mold 320 on the main slide 300 can squeeze the bar stock for a longer time during cold heading. The bar stock is cold-headed at a slower speed, and the product has sufficient forming time. This results in better metal flow during the cold heading process of the bar stock, and thus makes the size of products in the same batch basically consistent (improved uniformity).

[0148] Furthermore, in one embodiment of the present invention, the first link 220 can be made longer. When the length of the first link 220 is increased, such as... Figure 9 As shown, the first connecting rod 220, the second connecting rod 240, and the third connecting rod 260 form a "U"-shaped structure. During the rotation of the first connecting rod 220 driven by the main crankshaft 210, the first connecting rod 220 drives the third connecting rod 260, thereby causing the main slide 300 to reciprocate left and right. Similar to the "Y"-shaped transmission unit, which will not be elaborated here, the "U"-shaped transmission unit also increases the arc angle during cold heading, thus extending the pressing time of the bar stock by the front die 320 on the main slide 300, thereby improving the quality of the produced parts.

[0149] Furthermore, by configuring the transmission unit 200 as an elbow structure, the problem of the transmission unit 200 easily getting stuck at the front dead center in the prior art is avoided. Typically, to solve the problem of getting stuck at the front dead center during commissioning, the motor speed is increased to increase the extrusion pressure of the slide table. This increases the impact force on the front die 320 mounted on the main slide table 300 during stamping, making the front die 320 prone to damage during operation. However, with the elbow structure of this application, the bar stock is cold-forged at a slower speed, reducing the impact on the die and thus extending the die's service life.

[0150] Reference Figure 1The bed 100 houses a transmission unit 200 and a main slide 300. The main slide 300 is slidably connected to the bed 100 and is used to mount the front die 320 for stamping the bar stock. The transmission unit 200 is connected to a motor and drives the main slide 300 to slide left and right on the bed 100. The main crankshaft 210 is rotatably connected to the bed 100 and is drively connected to the output shaft of the motor. When the motor rotates, the main crankshaft 210 rotates synchronously. The main crankshaft 210 is an eccentric shaft, and a first connecting rod 220 is rotatably connected to the eccentric portion of the main crankshaft 210.

[0151] Combination Figure 16 and Figure 17 The transmission unit also includes a first connecting shaft 230 and a second connecting shaft 250. The first connecting shaft 230 is fixedly connected to the bed 100, and the second connecting shaft 250 is rotatably connected to the other end of the first connecting rod. One end of the second connecting rod is rotatably connected to the second connecting shaft 250, and the other end is rotatably connected to the first connecting shaft 230. One end of the third connecting rod is rotatably connected to the second connecting shaft 250, and the other end is rotatably connected to the main slide 300. By setting the first connecting shaft 230 and the second connecting shaft 250, the first connecting rod 220, the second connecting rod 240, and the third connecting rod 260 can be stably transmitted, thereby ensuring that the transmission unit can stably perform cold heading operations.

[0152] When processing special bolts such as internal hex bolts, the cold heading machine cannot form a hexagonal hole in the bolt in one go. The first cold heading can only form a shallow hexagonal hole in the bolt.

[0153] Furthermore, in one embodiment of the present invention, the transmission unit further includes a front-exit structure 270, which is used to drive the front mold 320 to stamp the workpiece. The front-exit structure 270 is also driven by the main crankshaft 210, and during the rotation of the main crankshaft 210, the front-exit structure 270 stamps the part.

[0154] Combination Figure 16 and Figure 18The front-exit structure 270 includes a front-exit pressure plate 271, which is rotatably connected to the main slide 300. A front-exit cam 272 is detachably mounted on the third connecting rod 260. The front-exit cam 272 abuts against the front-exit pressure plate 271, and the front-exit cam 272 drives the front-exit pressure plate 271 to rotate. A front-exit rocker arm 273 is rotatably connected to the main slide 300 and is located below the front-exit pressure plate 271. The front-exit pressure plate 271 drives the front-exit rocker arm 273 to rotate. A punch rod 274 is slidably connected inside the main slide 300. The front-exit rocker arm 273 drives the punch rod 274 to move. When the punch rod 274 is driven by the front-exit rocker arm 273, the punch rod 274 drives the front die 320 to punch the workpiece, thereby enabling some parts, such as hexagon socket head cap screws, to be cold-forged.

[0155] Based on the aforementioned principle of the main crankshaft 210 motion, combined with Figure 18 When the main crankshaft 210 rotates, it drives the first connecting rod 220 to rotate. During the movement of the first connecting rod 220, it drives the third connecting rod 260 to move, which in turn drives the front through-cam 272 to move. Figure 19 During the rotation of the front exit cam 272, the front exit pressure plate 271 will rotate on the main slide 300, thereby driving the front exit rocker arm 273 to rotate. The punch rod 274 is located on the left side of the front exit rocker arm 273. During the rotation of the front exit rocker arm 273, the front exit rocker arm 273 will drive the punch rod 274 to move to the left, thereby realizing the punching of the front end of the part.

[0156] In other words, when there are special processing requirements, such as needing to punch holes in the head of the bolt, the punch rod 274 is required to work.

[0157] Of course, when machining bolts that do not require special processing, the front exit cam 272, which is detachably mounted on the third link 260, can be used. After the front exit cam 272 is removed, the third link 260 will no longer drive the front exit pressure plate 271 to rotate.

[0158] Preferably, in one embodiment of the present invention, the center of gravity of the front outlet pressure plate 271 is biased to the right, so that the front outlet pressure plate 271 always abuts against the front outlet cam 272.

[0159] Preferably, in one embodiment of the present invention, a torsion spring is provided between the front outlet pressure plate 271 and the main slide 300. The torsion spring is initially provided with a torque. Under the action of the torque, the front outlet pressure plate 271 tends to rotate clockwise, thereby making the front outlet pressure plate 271 always abut against the front outlet cam 272.

[0160] Preferably, in one embodiment of the present invention, in order to enable the front exit cam 272 to better drive the front exit pressure plate 271 to rotate, the front exit pressure plate 271 is provided with a bearing at the contact position with the front exit cam 272, and the front exit cam 272 abuts against the bearing, so that the friction between the front exit cam 272 and the front exit pressure plate 271 is reduced.

[0161] Combination Figure 7 , Figure 8 and Figure 5 That is, when the main crankshaft 210 is as follows Figure 7 Move to the position shown Figure 8 The position shown is then moved to... Figure 5 At this time, the third link 260 is used to drive the main slide 300 to move to the right. During the movement to the right, the main crankshaft 210 drives the first link 220 to move against gravity.

[0162] Furthermore, in one embodiment of the present invention, the transmission unit further includes a main slide spring rod 310, which is mounted on the bed 100 and is used to drive the main slide 300 to move to the right.

[0163] Combination Figure 1 and Figure 7 The main slide spring rod 310 is mounted on the bed 100, and one end of the main slide spring rod 310 abuts against the main slide 300. When the main slide 300 moves from the left side to... Figure 7 During the process shown on the far right, the main slide spring rod 310 is compressed, and an elastic potential energy is stored in the main slide spring rod 310.

[0164] When the main slide 300 is as follows Figure 7 The position shown is towards Figure 8 When the main crankshaft 210 and the first connecting rod 220 move to the right, the main crankshaft 210 and the first connecting rod 220 need to do work against gravity, and the elastic potential energy in the compressed main slide spring rod 310 is released. That is, at this time, the main slide spring rod 310 can assist the main slide 300 to move to the right, so that the main slide 300 moves to the right smoothly.

[0165] Furthermore, in one embodiment of the present invention, to facilitate smoother sliding of the main slide table 300 to the right, two main slide table spring rods 310 are provided. Both main slide table spring rods 310 are mounted on the bed 100, and are respectively located on both sides of the main slide table 300, ensuring uniform force distribution on the main slide table 300 during spring-driven operation. The main slide table 300 is made of iron (iron alloy). When a cold heading machine is used in northern regions, where the temperature difference between winter and summer can exceed 50°C, the slide table will experience significant thermal expansion and contraction due to room temperature changes.

[0166] In order to ensure that the main slide 300 can still slide smoothly relative to the bed 100, in one embodiment of the present invention, the transmission unit further includes a limiting structure 280. The limiting structure 280 is used to limit the left and right positions of the main slide 300, so that the main slide 300 can be well limited at any temperature, thereby enabling the main slide 300 to make linear motion in the left and right directions under the drive of the third link 260.

[0167] Specifically, refer to Figure 16 and Figure 17 The limiting structure 280 includes a fixed side plate 281, an adjusting side plate 282, and an adjusting screw. The fixed side plate 281 and the adjusting side plate 282 respectively abut against the two sides of the main slide table 300, and a sliding groove is formed between the fixed side plate 281 and the adjusting side plate 282, within which the main slide table 300 slides. The adjusting screw is threadedly connected to the bed 100, and one end of the adjusting screw is threadedly connected to the adjusting side plate 282.

[0168] When the temperature is low in winter, the main slide 300 pre-cools and contracts. At this time, the width of the groove between the adjusting side plate 282 and the fixed side plate 281 needs to be reduced by rotating the adjusting bolt to allow the main slide 300 to slide normally. Similarly, when the temperature is high in summer, the main slide 300 expands at higher temperatures. At this time, the width of the groove between the adjusting side plate 282 and the fixed side plate 281 needs to be increased by rotating the adjusting bolt to allow the main slide 300 to slide normally.

[0169] Of course, in one embodiment of the present invention, in order to ensure that the adjustment of the adjusting side plate 282 is uniform, multiple adjusting bolts are usually provided. Furthermore, the adjusting bolts are as follows: Figure 16 As shown, multiple adjusting bolts are distributed along the edge of the adjusting side plate 282 to form a rectangular structure, thereby enabling the adjusting bolts to adjust the position of the adjusting side plate 282 more comprehensively, such as adjusting the left or right side of the adjusting side plate 282, so that the limiting structure 280 can effectively limit the main slide table 300 under different working conditions.

[0170] Preferably, in one embodiment of the present invention, in order to simplify the driving of the first link 220, the second link 240, and the third link 260, the first link 220, the second link 240, and the third link 260 are usually hollowed out. It should be noted that the strength of the first link 220, the second link 240, and the third link 260 is not affected after the hollowing out process.

[0171] Furthermore, in order to reduce wear between the main crankshaft 210 and the first connecting rod 220, the first connecting shaft 230 and the second connecting rod 240, the second connecting shaft 250 and the first connecting rod 220, and the second connecting shaft 240 and the third connecting rod 260, copper sleeves are provided on the main crankshaft 210, the first connecting shaft, and the second connecting shaft. The copper sleeves can effectively prevent wear. Even if the copper sleeves wear out, only the copper sleeves need to be replaced, without the need to replace the connecting rods or connecting shafts.

[0172] Simultaneously, during the movement of the main slide 300, the main slide spring rod 310 compresses the main slide 300, thereby reducing the gap between the third connecting rod 260 and the copper sleeve, the gap between the first connecting rod 220 and the copper sleeve, and the gap between the second connecting rod 240 and the copper sleeve. Furthermore, the main slide spring rod 310 also reduces the vibration of the main slide 300, thus improving the cold heading effect of the main slide 300.

[0173] The clamping unit 600 includes a crankshaft 610 that is rotatably connected to the bed, and is engaged with... Figure 2 and Figure 4 The through crankshaft 610 and the main crankshaft 210 are connected by gear transmission. When the main crankshaft 210 is driven to rotate by the motor, the through crankshaft 610 rotates synchronously. Figure 32 and Figure 33 The output end of the crankshaft 610 is connected to a transmission shaft 620 via a helical gear. The transmission shaft 620 is rotatably connected to the bed. When the crankshaft 610 rotates, the transmission shaft 620 rotates synchronously.

[0174] Combination Figure 1 and Figure 32 The machine bed is equipped with a flip clamp assembly 630, which is a conveying device disclosed in the prior application with application number 202310183092.0 (this application has not yet entered the substantive examination stage and is therefore not disclosed at present). The flip clamp assembly 630 is used to clamp, flip, and transfer bar stock. That is, the flip clamp assembly 630 is used to clamp the cut bar stock between the main slide table 300 and the main die box 900, and to move or flip the workpiece during the cold heading process between different stations of the main die box 900. At the same time, it also clamps out the workpiece after cold heading. The specific structure and working principle of the flip clamp assembly 630 have been disclosed in detail in the application document and will not be repeated here.

[0175] A clamp rocker arm 660 is rotatably connected to the bed. The middle part of the clamp rocker arm 660 is rotatably connected to the bed. A clamp rocker arm cam 621 is fixedly connected to the outer wall of the transmission shaft 620. One end of the clamp rocker arm 660 abuts against the clamp rocker arm cam 621, and the other end is connected to the flip clamp assembly 630 through the clamp connecting rod 650.

[0176] Reference Figure 32 When the main crankshaft 210 drives the outlet crankshaft 610 to rotate, the outlet crankshaft 610 drives the transmission long shaft 620 to rotate, which in turn drives the clamp rocker arm 660 to swing. The swinging clamp rocker arm 660 drives the flip clamp assembly 630 to reciprocate. Combined with the conveying device in the prior application, the flip clamp assembly 630 clamps the bar stock.

[0177] Furthermore, to ensure that the flipping clamp assembly 630 can return to its original position after moving to the right, the clamping unit 600 also includes a clamping rocker arm spring rod 670, which drives the clamping rocker arm 660 to abut against the clamping rocker arm cam 621. When the protrusion of the clamping rocker arm cam 621 moves away from the clamping rocker arm 660, the clamping rocker arm spring rod 670 drives the clamping rocker arm 660 to rotate counterclockwise, thereby causing the flipping clamp assembly 630 to move to the left. The clamping rocker arm spring rod 670 can be positioned above or below the clamping rocker arm central axis 640. When the clamping rocker arm spring rod 670 is positioned below the clamping rocker arm central axis 640, it is a tension spring. When the clamping rocker arm spring rod 670 is positioned above the clamping rocker arm central axis 640, it is a compression spring.

[0178] Preferably, in one embodiment of the present invention, combined with Figure 32 and Figure 1 To adapt to the bed structure, the clamp rocker arm spring rod 670 is positioned above the clamp rocker arm central shaft 640. One end of the clamp rocker arm spring rod 670 is mounted on the bed, and the other end abuts against the clamp rocker arm 660. The clamp rocker arm spring rod 670 is a compression spring rod. When the flip clamp assembly 630 moves to the left, the clamp rocker arm spring rod 670 stores energy; when the flip clamp assembly 630 moves to the right, the clamp rocker arm spring rod 670 releases the stored elastic potential energy.

[0179] Furthermore, such as Figure 32 As shown, a spring rod stop 680 is provided on the clamp rocker arm 660, and the other end of the clamp rocker arm spring rod 670 abuts against the spring rod stop 680.

[0180] In order to balance the force on the clamp rocker arm 660, two clamp rocker arm spring rods 670 are provided. The two clamp rocker arm spring rods 670 abut against the two sides of the spring rod stop post 680 respectively, that is, the clamp rocker arm spring rods 670 are respectively provided on both sides of the clamp rocker arm 660.

[0181] The feeding unit 400 disclosed in this application drives the bar stock to move via an active drive structure 420 and a first driven drive structure 430. The active drive structure 420 connects the drive gear 421 and the first feed wheel 423 via a first rotating shaft 422, and the first driven drive structure 430 connects the first driven gear 431 and the second feed wheel 434 via a second rotating shaft 432. The second rotating shaft 432 of the first driven drive structure 430 is disposed within a first mounting box 433, and the second rotating shaft 432 is rotatable relative to the first mounting box 433, which is rotatable relative to the mounting base 410. A first cylinder 2 is disposed above the mounting base 410, and the first cylinder 2 drives the first mounting box 433 to rotate. The feeding unit 400 also includes a baffle 4, on which a pressure sensor 4a is mounted. After the distance between the moving stop 4 and the cutting blade (the length of the bar to be cut) is set (to the desired length), when one end of the bar passes through the inlet conduit 7 and abuts against the stop 4, the pressure sensor 4a on the stop 4 is triggered. At this time, the pressure sensor 4a transmits a signal to the controller. The controller controls the extension of the cylinder's output shaft, causing the first mounting box 433 to rotate. With the rotation of the first mounting box 433, the second feeding wheel 434 presses tightly against the first feeding wheel 423. At this time, the bar located between the first feeding wheel 423 and the second feeding wheel 434 is also tightly clamped. Simultaneously, the driving gear 421 and the first driven gear 431 no longer mesh, and the first feeding wheel 423 and the second feeding wheel 434 no longer feed the bar, thus preventing the bar from moving left or right. This ensures that the bar can be accurately cut.

[0182] Specifically, such as Figure 20 and Figure 21 As shown, the feeding unit 400 includes a mounting base 410, which is combined with... Figure 23The mounting base 410 is provided with a first mounting hole 411 and a first limiting hole 412, with the first limiting hole 412 located directly above the first mounting hole 411. The active drive structure 420 includes a drive gear 421, a first rotating shaft 422, and a first feeding wheel 423. The drive gear 421 and the first feeding wheel 423 are coaxially fixed on the first rotating shaft 422, and the first rotating shaft 422 is installed in the first mounting hole 411. The first device 22 and the mounting base 410 are rotatably connected, and the first rotating shaft 422 is used to drive the drive gear 421 and the first feeding wheel 423 to rotate. The first driven structure 430 includes a first driven gear 431, a second rotating shaft 432, a first mounting box 433, and a second feeding wheel 434. The first driven gear 431 and the second feeding wheel 434 are respectively disposed at both ends of the second rotating shaft 432. The second rotating shaft 432 is rotatably connected inside the first mounting box 433. The first mounting box 433 passes through a first limiting hole 412 and is slidably connected to the mounting base 410. The first mounting box 433 slides up and down within the first limiting hole 412 in a limited manner. The first driven gear 431 meshes with the driving gear 421. When the first rotating shaft 422 drives the driving gear 421 to rotate, the first driven gear 431 meshing with the driving gear 421 rotates synchronously with the driving gear 421. Consequently, the first feeding wheel 423 and the second feeding wheel 434 rotate in opposite directions, allowing the bar stock between the first feeding wheel 423 and the second feeding wheel 434 to be conveyed to the cutting position of the cold heading machine.

[0183] The mounting base 410 is also provided with a first support rod 1. One end of the first support rod 1 is fixedly connected to the inner wall of the mounting base 410, and the other end is rotatably connected to the first mounting base 410. The first support rod 1 and the first mounting box 433 form a lever structure. The first mounting box 433 rotates around the first support rod 1 under the limitation of the first limiting hole 412.

[0184] A baffle 4 is provided on one side of the mounting base 410. The baffle 4 is located on the movement path of the bar stock and a pressure sensor 4a is provided on the baffle 4.

[0185] The mounting base 410 is also equipped with a first cylinder 2 and a controller. The first cylinder 2 is used to drive the first mounting box 433 to rotate around the first support rod 1. When the first cylinder 2 is working, the driving gear 421 and the first driven gear 431 are separated, and the rotation of the driving gear 421 cannot be transmitted to the first driven gear 431.

[0186] When the bar stock is driven to a sufficient length (the length of the workpiece to be processed) by the first feed roller 423 and the second feed roller 434, one end of the bar stock passes through the inlet conduit 7 and abuts against the stop frame 4, triggering the pressure sensor 4a. The pressure sensor 4a feeds back the signal to the controller, which controls the first cylinder 2 to move. The operation of the first cylinder 2 causes the drive gear 421 and the first driven gear 431 to separate. At the same time, the second feed roller rotates and approaches the first feed roller 423. The first feed roller 423 and the second feed roller 434 cooperate to clamp the bar stock, so that the bar stock will not feed during cutting, thereby ensuring the accuracy of the bar stock cutting length.

[0187] Reference Figure 24-25 To facilitate the separation of the first driven gear 431 and the driving gear 421, the first support rod 1 is typically positioned close to the first driven gear 431. For example... Figure 24 As shown, when the connection point between the first support rod 1 and the mounting base 410 is close to the first driven gear 431, the second feed wheel 434 only needs to descend a small height to separate the first driven gear 431 from the drive gear 421.

[0188] Of course, the first cylinder 2 is positioned above the first mounting box 433 and close to the second feed wheel 434. Upon receiving a signal from the controller, the output shaft of the first cylinder 2 extends, driving the first mounting box 433 to rotate around the first support rod 1. The proximity of the first cylinder 2 to the second feed wheel 434 allows it to apply a small downward pressure, causing the first driven gear 431 to move upward and disengage from the driving gear 421. Furthermore, the relatively long lever arm of the first cylinder 2 ensures stability of the first driven gear 431 at its highest point, preventing it from falling and engaging with the driving gear 421.

[0189] Furthermore, in one embodiment of the present invention, in order to enable the first mounting box 433 to be easily reset to its original position after rotation, that is, the position where the first driven tooth and the driving gear 421 mesh, a first compression spring 3 is also provided, close to the second feeding wheel 434, and one end of the first compression spring 3 is mounted on the mounting base 410, and the other end of the first compression spring 3 abuts against the bottom of the first mounting box 433.

[0190] When the first cylinder 2 drives the first mounting box 433 to rotate, the first compression spring 3 is compressed during the rotation of the first mounting box 433, so that the first compression spring 3 stores a certain amount of elastic potential energy. When the output shaft of the first cylinder 2 retracts, the elastic potential energy stored in the first compression spring 3 is released, and this elastic potential energy causes the first mounting box 433 to rotate. After the first mounting box 433 stops rotating, the first driven gear 431 and the driving gear 421 re-mesh.

[0191] Furthermore, in one embodiment of the present invention, the first compression spring 3 can initially be in a compressed state, combined with... Figure 24 or Figure 25 The first compression spring 3, in its compressed state, applies an upward force to the first mounting box 433. Under the action of the first support rod 1, the first mounting box 433 tends to rotate clockwise. At this time, the first driven gear 431 can press tightly against the driving gear 421.

[0192] To enable the first rotating shaft 422 to rotate and thus drive the drive gear 421 to rotate, a one-way bearing 442 is provided at one end of the first rotating shaft 422. The inner ring of the one-way bearing 442 is connected to the keyway on the outer wall of the first rotating shaft 422. The outer ring of the one-way bearing 442 is fixedly connected to the rocker arm 441, which is located on one side of the mounting base 410 and is used to swing left and right by being driven by the feeding rocker arm 443. The feeding rocker arm 443 is eccentrically mounted on the main crankshaft 210. When the main crankshaft 210 rotates, the feeding rocker arm 443 drives the rocker arm 441 to perform reciprocating left and right movements.

[0193] Preferably, in one embodiment of the invention, the one-way bearing 442 can rotate counterclockwise. For example... Figure 20 As shown, during the process of the swing arm 441 moving from left to right to the high point, since the one-way bearing 442 cannot rotate clockwise, the swing arm 441 will drive the first rotating shaft 422 to rotate, which in turn drives the drive gear 421 to rotate. The drive gear 421 drives the first driven gear 431 to rotate. The first feeding wheel 423 and the second feeding wheel 434 rotate in opposite directions, so that the bar can be conveyed to the stop frame 4 to trigger the pressure sensor 4a.

[0194] Furthermore, in one embodiment of the present invention, it is assumed that the swing arm 441 is in such a state as Figure 20 The position shown is the highest point of the swing arm 441. If the bar stock triggers the pressure sensor 4a at this moment, then this bar stock is the longest bar stock that the cold heading machine can process. After the bar stock triggers the pressure sensor 4a, the controller controls the first cylinder 2 to work according to the signal fed back by the pressure sensor 4a, thereby causing the first driven gear 431 and the driving gear 421 to separate.

[0195] If the bar stock reaches the position at swing arm 441 as shown Figure 20 The pressure sensor 4a is triggered at the highest point shown. Before the swing arm 441 reaches the highest point, the first driven gear 431 and the driving gear 421 have separated. At this time, the feeding rocker arm 443 drives the driving gear 421 to rotate. Since the second feeding wheel 434 is pressed tightly on the first feeding wheel 423, the bar material between the first feeding wheel 423 and the second feeding wheel 434 cannot move under the rotation of the first feeding wheel 423 alone.

[0196] Since the cold heading machine is powered by a single motor, the operating speeds of other parts typically remain constant. The processing speeds of these other parts should be less than or equal to the feed speed of the longest bar stock the cold heading machine can process. Therefore, when the length of the bar stock changes, simply altering the position of the stop 4 is sufficient to produce workpieces of different lengths.

[0197] Preferably, in one embodiment of the present invention, in order to make the feeding process of the feeding unit 400 more stable, a second mounting hole and a second limiting hole 413 are also provided on the mounting base 410, wherein the second mounting hole is located on one side of the first mounting hole 411, and the second limiting hole 413 is located directly above the second mounting hole.

[0198] The feeding unit 400 also includes a second drive structure and a third drive structure. The second drive structure includes a second driven gear 451, a third rotating shaft 452, and a third feeding wheel 453. The third rotating shaft 452 is rotatably mounted in a second mounting hole, and the second driven gear 451 and the third feeding wheel 453 are coaxially mounted at both ends of the third rotating shaft 452. The third drive structure includes a third driven gear 461, a fourth rotating shaft 462, and a fourth feeding wheel 463. The fourth rotating shaft 462 is mounted in a second limiting hole 413, and the third driven gear 461 and the fourth feeding wheel 463 are coaxially mounted at both ends of the fourth rotating shaft 462. The second driven gear 451 and the third driven gear 461 mesh.

[0199] A transmission gear 470 is also provided between the driving gear 421 and the second driven gear 451. The transmission gear 470 is rotatably connected to the mounting base 410 and meshes with the driving gear 421 and the second driven gear 451 respectively. When the driving gear 421 rotates, the driving gear 421 drives the second driven gear 451 to rotate through the driven gear.

[0200] Combination Figure 21 and Figure 22 As shown, when the drive gear 421 rotates clockwise, the first driven gear 431 rotates counterclockwise, the transmission gear 470 rotates counterclockwise, the second driven gear 451 rotates clockwise, and the third driven gear 461 rotates counterclockwise. That is, at this time, the drive gear 421 and the first driven gear 431 rotate towards each other to convey the bar material to the right, and the second driven gear 451 and the third driven gear 461 rotate towards each other to convey the bar material to the right.

[0201] Figure 21 and Figure 22 The left and right directions in the text are based on the directions marked in the text.

[0202] Of course, in order to make the bar stock more stable, the third driven structure 460 also includes a second mounting box 464, a fourth rotating shaft 462 and a second mounting box 464 rotatably connected, the second mounting box 464 passes through the second limiting hole 413, and the second mounting box 464 and the mounting base 410 are slidably connected.

[0203] The feeding unit 400 also includes a second support rod 5 and a second cylinder 6. One end of the second support rod 5 is fixedly connected to the mounting base 410, and the other end is rotatably connected to the second mounting box 464. The second cylinder 6 is mounted on the mounting base 410 and is used to drive the second mounting box 464 to rotate around the second support rod 5. The second cylinder 6 is also electrically connected to the controller, and the second cylinder 6 and the first cylinder 2 work synchronously, that is, the second cylinder 6 and the first cylinder 2 synchronously press the feeding wheel, so that the bar stock is locked.

[0204] Similar to the first support rod 1 and the first cylinder 2 mentioned above, the second support rod 5 is also close to the third driven gear 461, and the second cylinder 6 is close to the fourth feed wheel 463.

[0205] Similarly, in order to facilitate the return of the second mounting box 464 to its original position after rotation, a second compression spring is provided between the mounting base 410 and the second mounting box 464. The second compression spring can be in a compressed state initially, and the second mounting box 464 tends to rotate clockwise, so that the third driven gear 461 can press tightly against the second driven gear 451.

[0206] Preferably, in one embodiment of the present invention, the first feeding wheel 423 and the second feeding wheel 434 are provided with annular grooves in the circumferential direction, and the third feeding wheel 453 and the fourth feeding wheel 463 are provided with annular grooves in the axial direction, thereby enabling the bar stock to be roughly limited. Of course, the bar stock is mainly limited by the conduit.

[0207] like Figure 26 As shown, the first mounting box 433 and the second mounting box 464 are square tubular boxes. The second rotating shaft 432 is rotatably connected to the inner cavity of the first mounting box 433 and its two ends extend out of the first mounting box 433. The fourth rotating shaft 462 is rotatably connected to the inner cavity of the second mounting box 464 and its two ends extend out of the second mounting box 464.

[0208] Of course, in order to facilitate the installation of the first compression spring 3 and the second compression spring, a blind hole 414 for installing the first compression spring 3 and the second compression spring is provided on the mounting base 410.

[0209] The cutting unit 500 provided in this application is provided with two lugs 510, and a circular through hole is coaxially provided on the opposite side of the two lugs 510. A copper sleeve 570 is installed in the circular through hole. The copper sleeve 570 is a wear-resistant copper sleeve. The push rod is set as a cutter rod 530, and the cutter rod 530 is installed in the copper sleeve 570. The cutter rod 530 does not directly contact the bed 100. When the cutter rod 530 moves relative to the wear-resistant copper sleeve 570, the wear between the cutter rod 530 and the copper sleeve 570 is small, so that the cutter rod 530 can maintain its original state for a long time. This allows the cutter rod 530 to drive the cutter bar to move stably, thereby ensuring that the length of the bar stock cut meets the requirements. At the same time, when the cutter rod 530 moves relative to the copper sleeve 570, it is usually the copper sleeve 570 that wears. When the channel reaches the end of its service life, only the copper sleeve 570 needs to be replaced to restore the cutting unit 500 to normal cutting.

[0210] Specifically, refer to Figure 1 and Figure 27 The cutting unit 500 includes two lugs 510, which are fixedly connected to the bed 100 at opposite angles and intervals. (Refer to...) Figure 28 The lug 510 has coaxial circular through holes on opposite sides, as shown in the reference. Figure 29 A copper sleeve 570, which is a wear-resistant copper sleeve, is installed inside the through hole. A cutting rod 530 passes through two copper sleeves 570 and is slidably connected to each of the two sleeves. A cutting structure 520 is positioned between two lugs 510. The cutting rod 530 abuts against the cutting structure 520. When the cutting rod 530 slides within the two copper sleeves 570, it drives the cutting structure 520 to move closer to the bar stock between the lugs 510. When the cutting structure 520 reaches its limit position, the bar stock is cut. Because the lugs 510 and the cutting rod 530 are separated by the copper sleeves 570, the wear of the cutting rod 530 during operation is reduced, allowing it to maintain its original shape even after prolonged operation, ensuring that the cutting length of the bar stock falls within the tolerance range.

[0211] like Figure 29 As shown, the cutting unit 500 also includes a first elastic element 540 and a cutting drive structure 550, wherein the cutting drive structure 550 is used to drive the cutting rod 530 to reciprocate, the first elastic element 540 is mounted on the bed 100, and the first elastic element 540 is used to drive the cutting structure 520 away from the bar stock. The first elastic element 540 and the cutting rod 530 cooperate to enable the cutting structure 520 to continuously cut the bar stock.

[0212] Specifically, refer to Figure 30The cutting structure 520 includes a cutter holder 521 and a cutter head 522. The cutter holder 521 is disposed between two lugs 510 and is slidably connected to the lugs 510, allowing for stable sliding. The cutter head 522 is fixedly connected to one side of the cutter holder 521 and extends through the side wall of the bed 100 into the bed 100. The cutting rod 530 abuts against the cutter holder 521. During the reciprocating motion of the cutting rod 530, the cutting rod 530 drives the cutter holder 521 to move to the right, thereby driving the cutter head 522 to cut the bar stock.

[0213] Furthermore, the cutting rod 530 is provided with a cutting surface, and the cutter holder 521 abuts against the cutting surface. Specifically, the cutting surface includes a first part 531 and a second part 532, wherein the distance between the first part 531 and the axis of the rod is greater than the distance between the second part 532 and the axis of the rod, and a drop is formed between the second part 532 and the second part 532. When the cutting rod 530 moves backward, the cutter holder 521 moves from the second part 532 to the first part 531. At this time, the cutter holder 521 feeds to the right, that is, the cutter holder 521 drives the cutter head 522 to move to the right to cut the bar stock.

[0214] The transition plane between the first part 531 and the second part 532 is called the cutting part 533. One end of the cutting part 533 is connected to the first part 531, and the other end of the cutting part 533 is connected to the second part 532. When the cutter holder 521 abuts against the cutting part 533, the cutter is cutting the bar stock. In one embodiment of the present invention, in order to make the cutter holder 521 run smoothly, the cutting part 533 is set as a smooth curved surface, that is, the junction of the cutting part 533 with the first part 531 and the second part 532 is smoothly set, so that the cutter holder 521 can smoothly switch between different abutment planes, ensuring that the bar stock is stably cut.

[0215] To facilitate the installation of the first elastic element 540, a cutter bed cover plate 560 is installed on one side of the lug 510. The first elastic element 540 is installed on the cover plate, and one end of the first elastic element 540 is fixedly connected to the cutter holder 521. When the cutter holder 521 moves to the right, the first elastic element 540 stores an elastic potential energy. When the first part 531 no longer abuts against the cutter holder 521, the elastic potential energy is released and drives the cutter holder 521 to move to the left.

[0216] Specifically, the first elastic element 540 can be a compression spring or a tension spring. For example... Figure 30As shown, when the first elastic element 540 is set as a tension spring, the first elastic element 540 is located on the right side of the cutter bar bed cover plate 560; when the first elastic element 540 is set as a compression spring, the first elastic element 540 is located on the left side of the cutter bar bed cover plate 560.

[0217] Preferably, in one embodiment of the present invention, in order to facilitate the connection between the first elastic element 540 and the cutter holder 521, the first elastic element 540 is configured as a spring rod, which includes a compression spring and a rod body. The rod body passes through the cutter bed cover plate 560 and is fixedly connected to the cutter holder 521. When the cutter holder 521 moves to the right, it drives the rod body to move to the right. At this time, the rod body compresses the compression spring. When the first part 531 no longer abuts against the cutter holder 521, the compression spring releases its elastic potential energy and drives the cutter holder 521 to abut against the second part 532.

[0218] Preferably, in one embodiment of the present invention, in order to balance the force on the tool holder 521, two first elastic elements 540 are usually provided, and the two first elastic elements 540 are respectively provided at both ends of the tool holder 521.

[0219] Combination Figures 30-31 In one embodiment of the present invention, in order to enable the cutter structure 520 to adapt to cutting bars of different diameters, the cutter structure 520 further includes an eccentric adjustment shaft 523. The eccentric adjustment shaft 523 is threadedly connected to the cutter holder 521, and the eccentric adjustment shaft 523 includes a shaft body 5231 and an eccentric part 5232. The eccentric part 5232 is used to abut against the cutter rod 530. When it is necessary to adjust the different positions of the cutter head 522, it is only necessary to rotate the eccentric adjustment shaft 523 so that the position of the eccentric part 5232 abutting against the cutter rod 530 is different, that is, the position of the cutter head 522 is different in the left and right directions, thereby enabling the cutter to adapt to cutting bars of different diameters.

[0220] Of course, in one embodiment of the present invention, in order to make the movement of the cutter rod 530 relative to the eccentric adjustment shaft 523 smoother, a bearing 524 is also provided at the eccentric part 5232. The inner ring of the bearing 524 is sleeved on the outer wall of the eccentric part 5232, and the outer ring of the bearing 524 abuts against the cutter rod 530.

[0221] In one embodiment of the present invention, in order to reduce wear between the cutter head 522 and the machine bed, a copper sleeve 570 is also provided between the cutter head 522 and the machine bed, thereby enabling the cutter head 522 to work stably.

[0222] Specifically, the cutting drive structure 550 includes a bearing housing 551 and a cutting rod 552. A gear is provided at the output end of the main crankshaft 210, and the bearing housing 551 is eccentrically mounted on the gear. The cutting rod 552 is disposed between the bearing housing 551 and the cutting rod 530, with one end rotatably connected to the bearing housing 551 and the other end rotatably connected to the cutting rod 530. When the cutting rod 552 rotates under the drive of the main crankshaft 210, it engages... Figure 1 and Figure 29 At this time, the cutter connecting rod 552 moves left and right and drives the cutter rod 530 to move left and right, thereby driving the cutter to cut the bar stock.

[0223] The second ejector unit 800 in this application sets an ejector pin 822 and an ejector die 823 between the ejector rod 821 and the bar stock. The ejector rod 821 drives the ejector die 823 to move. Since the rod diameter of the ejector die 823 is larger than the rod diameter of the bar stock, the bar stock moves along the movement direction of the ejector rod 821 when it is ejected, so that the bar stock can be smoothly ejected into the gripper and held by the gripper.

[0224] Reference Figure 1 or Figure 32 The second ejector unit 800 includes a second ejector rocker arm 810, the middle of which is rotatably connected to the bed. One end of the second ejector rocker arm 810 is connected to the ejector drive structure 840. When the ejector drive structure 840 is working, the second ejector rocker arm 810 is driven to swing. The other end of the second ejector rocker arm 810 is rotatably connected to an ejector rod 821, which is slidably connected to the bed. When the second ejector rocker arm 810 is driven by the ejector drive structure 840, the swinging second ejector rocker arm 810 drives the ejector rod 821 to slide back and forth on the bed. The ejector structure also includes an ejector pin 822 and an ejector die 823. The ejector die 823 is slidably connected to the bed and is used to eject the bar stock. The ejector pin 822 is positioned between the ejector mold 823 and the ejector rod 821, with one end of the ejector pin 822 abutting against the ejector mold 823 and the other end abutting against the ejector rod 821.

[0225] Reference Figure 33 Specifically, the main mold box 900 is used to install the mold. The main mold box 900 has a through hole, and the ejector rod 821 and the ejector mold 823 are slidably connected in the through hole.

[0226] like Figure 34 As shown, when the second ejector rocker arm 810 rotates clockwise, it drives the ejector rod 821 to move to the left. At this time, the ejector rod 821, installed in the main mold box 900 on the bed, will abut against the ejector pin 822 during its leftward movement, thereby driving the ejector mold 823 to move to the left. Figure 33The ejector die 823 will extend from the main die box 900 and push the cut bar into the clamping jaws. Since the diameter of the ejector die 823 is larger than the diameter of the bar, the movement trajectory of the bar is the same as that of the ejector die 823 when ejecting the bar, and the bar can be pushed into the clamping jaws perpendicular to the main die box 900.

[0227] Reference Figure 32 The top-loading drive structure 840 includes a transmission vertical shaft 841 and a camshaft 842. A transmission long shaft 620 is connected to an outlet crankshaft 610 via a helical gear transmission. One end of the transmission long shaft 620 is connected to the outlet crankshaft 610, and the other end is connected to the transmission vertical shaft 841. One end of the transmission vertical shaft 841 is connected to the transmission long shaft 620, and the other end is connected to the camshaft 842. Both the transmission vertical shaft 841 and the camshaft 842 are rotatably connected to the machine bed. A top-loading cam 850 is mounted on the camshaft 842, which drives the second top-loading rocker arm 810 to swing. That is, when the main crankshaft 210 rotates, the top-loading cam 850 drives the second top-loading rocker arm 810 to swing.

[0228] The transmission long shaft 620, transmission vertical shaft 841 and camshaft 842 in this application are all designed to adapt to the specific structure of the bed so that the power at the main crankshaft 210 can be transmitted to the top cam 850.

[0229] Combination Figure 34 In one embodiment of the present invention, the second material feeding unit 800 further includes a material feeding rocker arm seat 860, which is mounted on the bed. The second material feeding rocker arm 810 is rotatably connected to the material feeding rocker arm seat 860. A drive block 870 is also rotatably connected to the material feeding rocker arm seat 860. A connecting plate 880 is provided between the second material feeding rocker arm 810 and the drive block 870, and one end of the connecting plate 880 is rotatably connected to the drive block 870, and the other end is rotatably connected to the second material feeding rocker arm 810.

[0230] like Figure 34 As shown, the ejector cam 850 and the drive block 870 abut against each other. When the protruding part of the ejector cam 850 abuts against the drive block 870, the ejector cam 850 will drive the drive block 870 to rotate clockwise. At this time, the drive block 870 will drive the connecting plate 880 to move to the right. The rightward movement of the connecting plate 880 will drive the ejector rocker arm seat 860 to rotate clockwise, and the ejector rod 821 will drive the ejector rod 821 to eject the bar stock to the left. By setting the drive block 870 and the connecting rod between the second ejector rocker arm 810 and the ejector cam 850, the required length of the second ejector rocker arm 810 is shortened. Under the same rod diameter, the second ejector rocker arm 810 in this application is more durable than the second ejector rocker arm 810 in the prior art.

[0231] Furthermore, in order to enable the ejector die 823 to reset after ejecting the bar stock, the ejector structure also includes a second elastic element 830, which is mounted on the bed and is used to ensure that the drive block 870 always abuts against the ejector cam 850.

[0232] Specifically, refer to Figure 34 and Figure 33 Based on the main mold box 900, the second elastic element 830 is set inside the main mold box 900. The second elastic element 830 is used to drive the ejector mold 823 to move to the right, thereby causing the ejector mold 823 to drive the ejector rod 821 to move to the right through the ejector pin 822, thereby causing the second ejector rocker arm 810 to rotate counterclockwise, so that the drive block 870 abuts against the ejector cam 850.

[0233] Furthermore, the bar stock feed tube is typically located beside the ejector die 823. After the bar stock is cut, it is pushed to the ejector die 823 by the cutter. To prevent wear between the bar stock feed and the ejector rod 821 on the main die box 900, a feed tube sleeve is also provided. This sleeve is inserted into the main die box 900 and does not rub against it. The bar stock is fed through the feed tube sleeve, and the ejector rod 821 and ejector die 823 are slidably connected within the feed tube sleeve.

[0234] The second elastic element 830 can be a compression spring or a tension spring. When the second elastic element 830 is a compression spring, such as... Figure 33 As shown, the second elastic element 830 is disposed in the inlet conduit sleeve. During the process of the ejector rod 821 moving to the left to eject the ejector die 823, the second elastic element 830 is compressed. When the ejector cam 850 no longer presses the drive block 870 to the right, under the reaction force of the second elastic element 830, the second elastic element 830 drives the ejector die 823 to reset. During the process of the ejector die 823 moving to the right, it abuts against the ejector pin 822, causing the ejector rod 821 to move to the right, thereby making the drive block 870 always abut against the cam.

[0235] In one embodiment of the present invention, when the second elastic element 830 is a tension spring, the installation and left-right principle of the tension spring can be compared with that of the compression spring, and will not be described in detail here.

[0236] The first ejector unit 700 replaces multiple parallel narrow ejector arms with a wider first ejector rocker arm 710, and multiple ejector bolts 730 are provided on the wider ejector rocker arm, so that the wider ejector rocker arm can simultaneously eject short parts similar to nuts from each cold heading station into the gripper. While ensuring that the cold heading machine can produce normally, the processing cost of the first ejector rocker arm 710 is reduced.

[0237] Specifically, combined Figures 35-36The first ejector unit 700 includes a first ejector rocker arm 710. The middle part of the first ejector rocker arm 710 is rotatably connected to the machine bed via a support shaft 712. Multiple ejector mounting plates 720 are mounted side-by-side on the top of the first ejector rocker arm 710, spaced apart. Each ejector mounting plate 720 is equipped with an ejector bolt 730. An ejector rod 740 is provided on one side of the ejector bolt 730, and the ejector rod 740 is slidably connected to the machine bed. The ejector rod 740 is driven to slide by the ejector bolt 730. A main mold box 900 is provided on one side of the ejector rod 740, and the ejector rod 740 is directly opposite the machining hole within the main mold box 900. The first ejector unit 700 also includes an ejector connecting rod 770. One end of the ejector connecting rod 770 is rotatably connected to the eccentric part of the crankshaft 610, and the other end of the ejector connecting rod 770 is rotatably connected to the bottom of the first ejector rocker arm 710. When one end of the ejector connecting rod 770 moves with the rotation of the crankshaft 610, the other end of the ejector connecting rod 770 will reciprocate left and right.

[0238] During the reciprocating motion of the other end of the ejector linkage 770, the ejector linkage 770 will drive the first ejector rocker arm 710 to swing clockwise and counterclockwise, and then the first ejector rocker arm 710 will drive the ejector bolt 730 to eject the workpiece into the clamp.

[0239] After the workpiece is cold-headed, the drive structure drives the first ejector rocker arm 710 (e.g., Figure 36 As shown in the diagram, when the first ejector rocker arm 710 rotates clockwise, it drives the ejector mounting plate 720 to rotate. The ejector bolt 730 mounted on the ejector mounting plate 720 rotates accordingly. At this time, the ejector bolt 730 will push the ejector rod 740 to the right, so that the ejector rod 740 is pushed into the machining hole of the main mold box 900, thereby pushing the workpiece in the machining hole into the clamping jaw.

[0240] Specifically, refer to Figure 36 The push rod bolt 730 is threaded onto the mounting plate of the first push rocker arm 710. The push rod bolt 730 includes a rod portion 731 and a head 732, wherein the head 732 faces the push rod 740 and is used to impact the push rod 740. The head 732 has a larger cross-sectional area, which allows the push rod bolt 730 to impact the push rod 740 more accurately.

[0241] To facilitate the installation of the ejector rod 740, the first ejector unit 700 also includes an ejector tube base plate 750 and an ejector tube 760, wherein the ejector tube base plate 750 is mounted on the bed 100 by screws. The bed 100 has a through hole, and the ejector tube base plate 750 has a threaded hole coaxial with the through hole, into which the ejector tube 760 is threaded. The ejector rod 740 is slidably connected to the inner wall of the ejector tube 760.

[0242] The inner diameter of the ejector tube 760 is variable, which facilitates the replacement of ejector pins 740 of different thicknesses to accommodate workpieces of different sizes. It also facilitates the replacement of ejector pins 740 when they are damaged.

[0243] Furthermore, the positional relationship between the ejector tube 760 and the ejector tube base plate 750 is adjustable. When processing workpieces of different lengths, the required ejection distance is different due to the different lengths after cold heading. That is, the distance that the ejector rod 740 moves to the right needs to be adjusted so that the first ejector unit 700 can be adapted to produce different workpieces.

[0244] In one embodiment of the present invention, when producing workpieces with shorter lengths, it is necessary to rotate the ejector tube 760 so that the ejector rod 740 moves a greater distance to the right.

[0245] In one embodiment of the present invention, when producing a workpiece with a long length, it is necessary to rotate the ejector tube 760 so that the ejector rod 740 moves to the right a smaller distance.

[0246] Of course, in one embodiment of the present invention, in order to enable the push rod 740 to automatically return to its initial position after moving to the right, a third elastic element is also provided in the push-out toothed tube 760. The third elastic element is used to drive the push rod 740 to move toward the push rod bolt 730.

[0247] Combination Figure 36 The third elastic element disposed within the ejector tube 760 can be a compression spring or a tension spring. When the third elastic element is a compression spring, the compression spring is compressed when the ejector rod 740 moves to the right, and thus the ejector rod 740 can move to the left after the first ejector rocker arm 710 returns to its counterclockwise position. When the third elastic element is a tension spring, the tension spring is stretched when the ejector rod 740 moves to the right, and thus the ejector rod 740 can move to the left after the first ejector rocker arm 710 returns to its counterclockwise position.

[0248] Since the installation of a third elastic element inside the tube is a common practice, it is not shown in the attached drawings.

[0249] Preferably, in one embodiment of the present invention, in order to ensure smooth rotation between the through crankshaft 610 and the ejector connecting rod 770, a copper sleeve is provided at the eccentric part of the through crankshaft 610, and the copper sleeve ensures smooth rotation of the ejector connecting rod 770.

[0250] Furthermore, in order to make the top material swing arm swing more easily, a first weight reduction hole 711 is provided on the top material swing arm. The array of first weight reduction holes 711 is provided on the top material swing arm. The provision of the first weight reduction holes 711 ensures the strength of the top material swing arm structure, reduces the self-weight of the top material swing arm, and makes the top material swing arm easier to be driven by the crankshaft 610.

[0251] Furthermore, combining Figure 35 and Figure 37 Similarly, the top-loading connecting rod 770 is provided with a second weight-reducing hole 771. The second weight-reducing holes 771 are spaced apart along the extension direction of the top-loading connecting rod 770, and are located on both sides of the top-loading connecting rod 770. The cross-section of the top-loading connecting rod 770 with the second weight-reducing holes 771 is "I" shaped. Of course, the setting of the second weight-reducing holes 771 ensures the strength of the top-loading swing arm structure, thereby reducing the self-weight of the top-loading connecting rod 770, and thus reducing the friction between the top-loading connecting rod 770 and the copper sleeve.

[0252] Of course, a bearing 524 is provided at the contact point between the drive block 87 and the ejector cam 85, so that the ejector cam 85 can smoothly drive the drive block 87 to rotate. Similarly, a bearing is provided at the contact point between the clamp rocker arm 660 and the clamp rocker arm cam 621, so that the clamp rocker arm cam 621 can smoothly drive the clamp rocker arm 660 to rotate.

[0253] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A cold heading machine, characterized in that, include: Bed frame; The feeding unit, mounted on the bed, is used to convey bar stock; The cutting unit, mounted on the machine bed, is used to cut the bar stock conveyed to the machine bed by the feeding unit. The main slide and the main mold box are positioned opposite each other, with the main slide slidably connected to the bed and the main mold box fixedly connected to the bed. The transmission unit includes: The main crankshaft is rotatably connected to the bed and is connected to an external motor drive. The first connecting rod is rotatably connected at one end to the eccentric portion of the main crankshaft; The first connecting shaft is fixedly connected to the bed frame; The second link is positioned above the first link, and one end of the second link is rotatably connected to the first connecting shaft; A second connecting shaft, the other end of the first connecting rod being rotatably connected to the second connecting shaft; and the other end of the second connecting rod being rotatably connected to the second connecting shaft; and The pusher connecting rod has one end rotatably connected to the second connecting shaft and the other end rotatably connected to the main slide table. The pusher connecting rod is used to push the main slide table to slide relative to the bed. The main slide table is used to cold head the bar stock close to the main mold box. The clamping unit, mounted on the bed, is used to clamp the bar stock to different workstations; The feeding unit includes: A mounting base is installed on the bed, and the mounting base is provided with a first mounting hole and a first limiting hole, with the first mounting hole located directly below the first limiting hole; An active drive structure includes a drive gear, a first rotating shaft, and a first feeding wheel. The drive gear and the first feeding wheel are coaxially fixedly connected to the first rotating shaft, and the first rotating shaft is rotatably installed in the first mounting hole. The first driven structure includes a first driven gear, a second rotating shaft, a first mounting box, and a second feeding wheel. The second rotating shaft is rotatably connected to the first mounting box. The first mounting box passes through the first limiting hole and is slidably connected to the mounting base. The first driven gear and the second feeding wheel are coaxially fixedly connected to both ends of the second rotating shaft. The first driven gear meshes with the driving gear. The first feeding wheel and the second feeding wheel cooperate to convey bar stock. The first support rod has one end fixedly connected to the mounting base and the other end rotatably connected to the first mounting box; A first cylinder is mounted on the mounting base. The first cylinder is used to drive the first mounting box to rotate around the first support rod, so that the driving gear is separated from the first driven gear. A stop and a controller are provided. The stop is set on the path of the bar stock movement and is used to adjust the length of the feed bar stock. A pressure sensor is set on the stop. The first cylinder, the pressure sensor and the controller are communicatively connected. The operation of the first cylinder causes the drive gear and the first driven gear to separate. At the same time, the second feed wheel rotates and approaches the first feed wheel. The first and second feed wheels cooperate to clamp the bar stock, so that the bar stock will not be fed during cutting. The feeding unit further includes: The feeding rocker arm is eccentrically connected to the outlet crankshaft at one end. A swing arm, located on one side of the mounting base, is used to swing left and right by being driven by a feeding rocker arm; A one-way bearing is provided at one end of the first rotating shaft. The inner ring of the one-way bearing is connected to the keyway of the outer wall of the first rotating shaft, and the outer ring is fixedly connected to the rocker arm. The feeding unit also includes a first compression spring, which is close to the second feeding wheel. One end of the first compression spring is installed on the mounting base, and the other end is installed on the bottom of the first mounting box. The first compression spring applies an upward force to the first mounting box. Under the action of the first support rod, the first mounting box tends to rotate clockwise. At this time, the first driven gear can press tightly against the driving gear. The mounting base is provided with a second mounting hole and a second limiting hole. The second mounting hole is located on one side of the first mounting hole, and the second limiting hole is located directly above the second mounting hole. The feeding unit further includes: The second driven structure includes a second driven gear, a third rotating shaft and a third feeding wheel. The third rotating shaft is rotatably installed in the second mounting hole, and the second driven gear and the third feeding wheel are coaxially fixedly connected to both ends of the third rotating shaft. The third driven structure includes a third driven gear, a fourth rotating shaft and a fourth feeding wheel. The fourth rotating shaft is installed in the second limiting hole, and the third driven gear and the third feeding wheel are coaxially fixedly connected to both ends of the fourth rotating shaft. A transmission gear is rotatably connected to the mounting base, and the transmission gear is disposed between the driving gear and the second driven gear, and the transmission gear meshes with the driving gear and the second driven gear respectively; The third driven structure further includes a second mounting box, and the feeding unit further includes a second support rod and a second cylinder; The fourth rotating shaft is rotatably connected to the second mounting box, the second mounting box passes through the second limiting hole, the second mounting box is slidably connected to the mounting base, one end of the second support rod is fixedly connected to the mounting base, and the other end is rotatably connected to the second mounting box. The second cylinder is mounted on the mounting base and is used to drive the second mounting box to rotate around the second support rod, so that the second driven gear is separated from the third driven gear. The feeding unit also includes a second compression spring, which is close to the fourth feeding wheel. One end of the second compression spring abuts against the mounting base, and the other end abuts against the bottom of the second mounting box. The first and second feeding wheels are provided with annular grooves in the circumferential direction, and the third and fourth feeding wheels are provided with annular grooves in the axial direction. The cutting unit includes: Two lugs are fixedly connected to one side of the bed. The two lugs are arranged opposite each other, and a coaxial circular through hole is provided on the opposite side of the two lugs. A copper sleeve is installed in the through hole. A cutting structure is disposed between the two lugs; A round cutting rod is slidably connected inside the copper sleeve, used to drive the cutting structure to approach and cut the bar stock; A first elastic element is mounted on the bed, and the first elastic element is used to drive the cutting structure away from the bar stock; The cutter connecting rod is eccentrically rotatably connected to the main crankshaft at one end, and rotatably connected to the cutter rod at the other end.

2. A cold heading machine according to claim 1, characterized in that, When the second connecting shaft is located below the first connecting shaft, the first connecting rod, the second connecting rod, and the material pushing connecting rod form a "Y" - shaped structure.

3. A cold heading machine according to claim 1, characterized in that, When the second connecting shaft is located above the first connecting shaft, the first connecting rod, the second connecting rod, and the material pushing connecting rod form a "one" - shaped structure.

4. A cold heading machine according to claim 1, characterized in that, The clamping unit includes: A through - crankshaft, rotatably connected to the machine body and drivingly connected to the main crankshaft; A transmission long shaft, rotatably connected to the machine body and drivingly connected to the through - crankshaft, and a clamp rocker cam is arranged on the transmission long shaft; A flipping clamp assembly, installed on the machine body for clamping the bar stock; A clamp connecting rod, one end of which is connected to the flipping clamp assembly; A clamp rocker, the middle of which is rotatably connected to the machine body, one end of the clamp rocker abuts against the clamp rocker cam, and the other end is rotatably connected to the other end of the clamp connecting rod.

5. A cold heading machine according to claim 4, characterized in that, The cold - heading machine further includes a first material ejecting unit, and the first material ejecting unit includes: A first material ejecting rocker, the middle of which is rotatably connected to the machine body; A material ejecting connecting rod, one end of which is eccentrically rotatably connected to the through - crankshaft, and the other end is rotatably connected to the first material ejecting rocker; A plurality of material ejecting mounting plates, arranged at intervals on the top of the material ejecting rocker; A plurality of ejector bolts, and the plurality of ejector bolts are respectively installed on the material ejecting mounting plates one by one; and An ejector rod, slidably connected in the main die box, and the ejector rod is used to be driven by the ejector bolts to eject the material.

6. A cold heading machine according to claim 4, characterized in that, The cold - heading machine further includes a second material ejecting unit, and the second material ejecting unit includes: A second material ejecting rocker, the middle of which is rotatably connected to the machine body; A material ejecting rod, slidably connected in the main die box, one end of the material ejecting rod is rotatably connected to one end of the second material ejecting rocker, and the second material ejecting rocker is used to drive the material ejecting rod to reciprocate; A material ejecting needle and a material ejecting die, the material ejecting die is slidably connected in the main die box, the material ejecting die is used to eject the material, one end of the material ejecting needle abuts against the material ejecting die, and the other end abuts against the material ejecting rod; A material ejecting driving structure, drivingly connected to the transmission long shaft, for driving the material ejecting rocker to swing reciprocally.

7. A cold heading machine according to claim 1, characterized in that, The transmission unit further includes a front through - out structure, and the front through - out structure includes: A front through - out pressure plate, rotatably connected to the main slide table; A front through - out cam, detachably installed on the material pushing connecting rod; A front through - out rocker, rotatably connected to the main slide table, and the front through - out rocker is arranged below the front through - out pressure plate; A punching rod, slidably connected in the main slide table, the front through - out cam is in abutting connection with the front through - out pressure plate, the front through - out cam is used to drive the front through - out pressure plate to rotate, the front through - out pressure plate abuts against the front through - out rocker, the front through - out pressure plate is used to drive the front through - out rocker to rotate, the front through - out rocker is used to drive the punching rod to move, and the punching rod is used to drive the front die to punch the workpiece.

8. A cold heading machine according to claim 1, characterized in that, The transmission unit also includes a limiting structure, which includes a fixed side plate, an adjusting side plate, and an adjusting screw. The fixed side plate and the adjusting side plate respectively abut against the two sides of the main slide. The adjusting screw is threadedly connected to the bed and passes through the bed to abut against the adjusting side plate.

9. A cold heading machine according to claim 1, characterized in that, The cutting structure includes a cutter holder and a cutter head. The cutter head passes through the side wall of the bed and is slidably connected to the bed. The cutter holder abuts against the cutting rod.

10. A cold heading machine according to claim 9, characterized in that, The cutting rod has a first plane and a second plane. The distance between the first plane and the axis of the rod is greater than the distance between the second plane and the axis of the rod. A cutting surface is provided between the first plane and the second plane, and the cutting surface is used to abut against the blade holder.

11. A cold heading machine according to claim 9, characterized in that, The cutting tool structure also includes an eccentric adjustment shaft, which is threadedly connected to the tool holder. The eccentric adjustment shaft includes a shaft body and an eccentric part, which is used to abut against the cutting tool rod.

12. A cold heading machine according to claim 6, characterized in that, The top material driving structure includes: A vertical drive shaft is rotatably connected to the bed, and the vertical drive shaft is drively connected to the long drive shaft. A camshaft is rotatably connected to the bed and is connected to the transmission vertical shaft. A top material cam is mounted on the camshaft and abuts against the top material rocker arm. The top material cam is used to drive the top material rocker arm to reciprocate.

13. A cold heading machine according to claim 12, characterized in that, The second top-feeding unit also includes: The top material rocker arm seat is mounted on the bed; The drive block is rotatably connected to the top material rocker arm seat; A connecting plate is disposed between the top material rocker arm and the drive block. One end of the connecting plate is rotatably connected to the drive block, and the other end is rotatably connected to one end of the top material rocker arm. The drive block abuts against the top material cam, and the top material cam is used to drive the drive block to swing.

14. A cold heading machine according to claim 6, characterized in that, The second ejector unit also includes a second elastic element, which is installed inside the main mold box. One end of the second elastic element abuts against the main mold box, and the other end abuts against the ejector mold.

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