A cold heading production line and its production process

Abstract

The present invention provides a cold heading production line and its production process. The cold heading production line includes a wire storage device, a roll pressing device, a traction cutting device, and a cold heading machine arranged in sequence; a metal wire is provided on the wire storage device; a stepped roll pressing cavity is provided on the roll pressing device; the traction cutting device includes a cutting mechanism and an active traction mechanism, the active traction mechanism is on the side close to the roll pressing device, and the cutting mechanism is arranged close to the cold heading machine; a conveying device is provided between the cold heading machine and the cutting mechanism. The present invention has the following beneficial effects: Through the cooperation of the wire storage device, the roll pressing device, and the traction cutting device, partial forming work is completed before cold heading, which solves the technical problem in the existing cold heading technology that when cold heading parts with a relatively large stepped diameter, multiple sets of molds need to be used, resulting in a relatively high production line cost.

Description

Technical Field

[0001] The present invention relates to the technical field of screw and bolt production, and particularly to a cold heading production line and its production process. Background Art

[0002] Cold heading is a forging method that uses a die to upset and form metal wire at room temperature. It is usually used to manufacture screws, bolts, rivets, etc. The metal wire can be copper, aluminum, carbon steel, alloy steel, stainless steel, titanium alloy, etc.

[0003] Cold heading is mostly carried out on a cold heading machine. For example, operations such as cutting, upsetting, accumulating, forming, chamfering, thread rolling, necking down, and trimming are sequentially completed on the cold heading machine.

[0004] In the forming process, taking screws as an example, since the diameter difference between the screw rod part and the screw head part is relatively large, generally multiple sets of dies are required to perform cold heading in sequence to ensure that the amount of deformation during each cold heading is not too large and to avoid the situation of metal wire breakage.

[0005] Therefore, generally multiple sets of dies are required for the forming part, and the dies in the cold heading process generally have a high cost, which in turn leads to a high cost of cold heading production. Summary of the Invention

[0006] Aiming at the deficiencies in the prior art, the present invention provides a cold heading production line and its production process, which solves the technical problem that in the existing cold heading technology, when cold heading parts with a relatively large stepped diameter, multiple sets of dies are required, resulting in a high cost of the production line.

[0007] A cold heading production line according to an embodiment of the present invention includes a wire storage device, a roll pressing device, a traction cutting device, and a cold heading machine arranged in sequence;

[0008] A metal wire is arranged on the wire storage device;

[0009] A stepped roll pressing cavity is provided on the roll pressing device;

[0010] The traction cutting device includes a cutting mechanism and a main traction mechanism. The main traction mechanism is on the side close to the roll pressing device, and the cutting mechanism is arranged close to the cold heading machine;

[0011] A conveying device is arranged between the cold heading machine and the cutting mechanism.

[0012] The technical principle of the present invention is: when the metal wire passes through the roll pressing device, due to the circumferential position adjustment of the roll pressing device, the metal wire passes through different diameters of the stepped roll pressing cavity and is extruded into a shape with a changing outer diameter, and then is cut by the cutting mechanism according to actual requirements, as shown in the attached Figure 1-2As shown in the figure, after being cut, it enters the conveying device and finally forms through a cold heading machine. Since the front part has been roll-pressed by the roll-pressing device, only one cold heading is required to form the required stepped part, and one cold heading means only one set of cold heading dies is needed.

[0013] Although the present application adds a roll-pressing device, since the stepped roll-pressing cavity of the roll-pressing device can be set with multiple diameters, it can meet the requirements of most stepped parts. The dies in the prior art are special dies corresponding to specific parts, while the roll-pressing device of the present application is a general-purpose device.

[0014] The active traction mechanism is used to provide driving force for the metal wire and is also the active force for the extrusion deformation of the metal wire at the outlet of the roll-pressing device.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Through the cooperation of the wire storage device, the roll-pressing device and the traction cutting device, part of the forming work is completed before cold heading, which solves the technical problem in the prior cold heading technology that when cold heading a part with a relatively large stepped diameter, multiple sets of dies are required, resulting in a relatively high production line cost.

[0016] Further, the roll-pressing device includes two meshing pressure rollers. Stepped roll-pressing cavities are circumferentially arranged on the cylindrical surfaces of the two pressure rollers, and the edges of the two stepped roll-pressing cavities coincide with each other.

[0017] Further, the two pressure rollers are drivingly connected to a common roll-pressing motor.

[0018] Further, the active traction mechanism includes at least two sets of traction wheel groups, and a common spacing slide rail is provided under all the traction wheel groups.

[0019] Further, each traction wheel group includes two symmetrically arranged traction wheels. A traction motor is connected to each traction wheel. A common width slide rail is provided under the two traction wheels. The width slide rail is arranged in the spacing slide rail. Blocks are provided on both sides of the width slide rail, and compression springs are provided between the blocks and the traction wheels.

[0020] Further, the cutting mechanism includes a punching machine and a punching platform arranged under the punching machine. A cutting edge is provided on the punching machine, and the punching platform is inclined towards the conveying device.

[0021] Further, the punching platform is provided with a sensor, and a telescopic rod for adjusting the vertical distance from the punching platform is provided under the sensor.

[0022] Further, the roll-pressing device, the cutting mechanism and the active traction mechanism are controlled by a common control system.

[0023] Further, the conveying device is a vibrating disk, and the end of the vibrating disk is communicated with a cold heading machine.

[0024] A production process of a cold heading production line according to the embodiments of the present invention includes:

[0025] S1. Drawing: Drawing out the metal wire through the rolling device and installing it on the active traction mechanism;

[0026] S2. First rolling: The rolling device rotates, adjusts the stepped rolling cavity to the required rolling diameter, and then the active traction mechanism pulls the metal wire forward. After advancing a specific distance, the active traction mechanism stops pulling;

[0027] S3. Circular rolling: Repeat S2, but before each time, adjust the stepped rolling cavity to another required rolling diameter, and finally roll the metal wire into a metal wire with a multi-step structure;

[0028] S4. Cutting: When the rolled metal wire in step S3 reaches the cutting mechanism, it is cut;

[0029] S5. Cold heading: The metal wire cut in step S4 falls into the conveying device and is then conveyed into the cold heading machine for cold heading forming.

[0030] The technical principle of the present invention is: Repeat step S2. Repeating 2 times forms a two-step part, repeating 3 times forms a three-step part, and so on.

[0031] Compared with the prior art, the present invention has the following beneficial effects: By repeating step S2, a multi-step structure can be formed to reduce the number of cold heading times in subsequent forming, thereby reducing the required cold heading dies and playing a role in reducing costs. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a two-step metal wire of Embodiments 1-2 of the present invention.

[0033] Figure 2 It is a schematic structural diagram of a three-step metal wire of Embodiments 1-2 of the present invention.

[0034] Figure 3 It is a schematic structural diagram of a cold heading production line of Embodiment 1 of the present invention.

[0035] Figure 4 It is a schematic structural diagram of a wire storage device of Embodiment 1 of the present invention.

[0036] Figure 5 It is a schematic structural diagram of a rolling device of Embodiment 1 of the present invention.

[0037] Figure 6 Structural schematic diagram of the traction cutting device according to Embodiment 1 of the present invention.

[0038] Figure 7 Structural schematic diagram of the traction wheel set according to Embodiment 1 of the present invention.

[0039] Figure 8 Structural block diagram of the control system according to Embodiment 1 of the present invention.

[0040] Figure 9 Process flow chart of the cold heading production line according to Embodiment 1 of the present invention.

[0041] Figure 10 Structural schematic diagram of the cold heading production line according to Embodiment 2 of the present invention.

[0042] In the above-mentioned drawings: 100, wire storage device; 110, base; 120, mandrel; 130, metal wire; 200, rolling device; 210, pressure roller; 220, stepped rolling cavity; 230, rolling motor; 300, cutting mechanism; 310, punching machine; 311, cutting edge; 320, punching platform; 321, inductor; 322, telescopic rod; 400, active traction mechanism; 410, traction wheel; 411, compression spring; 420, traction motor; 430, spacing slide rail; 440, width slide rail; 441, stop block; 500, cold heading machine; 510, conveying device; 600, heating device; 700, air cooling device. Detailed implementation manners

[0043] The technical solutions in the present invention will be further described below with reference to the drawings and embodiments.

[0044] Embodiment 1

[0045] As Figure 3 shown in the cold heading production line, which includes a wire storage device 100, a rolling device 200, a traction cutting device and a cold heading machine 500 arranged in sequence; specifically, a metal wire 130 is arranged on the wire storage device 100; a stepped rolling cavity 220 is provided on the rolling device 200 for the metal wire 130 to pass through.

[0046] The traction cutting device includes a cutting mechanism 300 and an active traction mechanism 400. The active traction mechanism 400 is on the side close to the rolling device 200, and is used to traction the metal wire 130 through the rolling device 200 and push it to the cutting mechanism 300. The cutting mechanism 300 is arranged close to the cold heading machine 500, facilitating the cut metal wire 130 to enter the cold heading machine 500.

[0047] A transfer device 510 is provided between the cold heading machine 500 and the cutting mechanism 300 for transferring the cut metal wire 130. Specifically, the transfer device 510 is a vibrating bowl, and the end of the vibrating bowl is connected to the cold heading machine 500.

[0048] Specifically, as Figure 4 shown, the wire storage device 100 is a base 110 and a mandrel 120 arranged on the base 110. It can be seen that the wire is wound around the mandrel 120, and a bearing is provided between the mandrel 120 and the base 110 to facilitate the rotation of the mandrel 120.

[0049] As Figure 5 shown, the rolling device 200 includes two meshing rollers 210. On the cylindrical surfaces of the two rollers 210, stepped rolling cavities 220 are arranged in a surrounding manner. The edges of the two stepped rolling cavities 220 coincide with each other. Thus, when the metal wire 130 passes through, it can be extruded to make its diameter smaller. Specifically, the stepped rolling cavity 220 can be provided with several steps to cope with parts with various different diameter requirements.

[0050] As Figure 5 shown, the two rollers 210 are drivingly connected to a common rolling motor 230. That is, the rolling motor 230 can drive the two rollers 210 to adjust different positions to form extrusion with different diameters. Specifically, the rolling motor 230 uses a stepper motor to control the rotation angle of the rollers 210.

[0051] As Figure 6-7 shown, the active traction mechanism 400 includes at least two groups of traction wheels 410 and a traction motor 420 for driving all the traction wheels 410. A common spacing slide rail 430 is provided under all the groups of traction wheels 410. That is, the number of groups of traction wheels 410 can be arbitrarily increased on the spacing slide rail 430. The purpose of using at least two groups is to ensure that when one group slips, the other group can continue to traction the metal wire 130.

[0052] Specifically, each group of traction wheels 410 includes two symmetrically arranged traction wheels 410. A traction motor 420 is connected to each traction wheel 410 for driving the traction wheel 410. A common width slide rail 440 is provided under the two traction wheels 410. The width slide rail 440 is fixed in the spacing slide rail 430 by screws. Blocks 441 are provided on both sides of the width slide rail 440. A compression spring 411 is provided between the block 441 and the traction wheel 410. That is, the compression spring 411 provides a clamping force for the metal wire 130 with a changing outer diameter to ensure that the rotation of the traction wheel 410 can complete the traction of the metal wire 130. The traction motor 420 uses a stepper motor to calculate the distance of the traction wire.

[0053] As Figure 6As shown, the cutting mechanism 300 includes a stamping machine 310 and a stamping platform 320 disposed below the stamping machine 310. A cutting edge 311 is provided on the stamping machine 310. That is, when the stamping machine 310 descends, the metal wire 130 is cut on the stamping platform 320. The stamping platform 320 is inclined toward the conveying device 510 to facilitate the cut metal wire 130 to slide into the conveying device 510.

[0054] As Figure 6 shown. The stamping platform 320 is provided with a sensor 321. Below the sensor 321, there is a telescopic rod 322 for adjusting the vertical distance from the stamping platform 320. The telescopic rod 322 is an electric push rod for adjusting the height of the sensor 321, thereby distinguishing whether there is a metal wire 130 on the stamping platform 320. The function of the telescopic rod 322 is to adjust the height position of the sensor 321 to more accurately sense the metal wire 130.

[0055] As Figure 8 shown, the rolling device 200, the cutting mechanism 300 and the active traction mechanism 400 are controlled by a shared control system. Specifically, the control system controls the operations of the sensor 321, the rolling motor 230, the traction motor 420 and the stamping machine 310.

[0056] As Figure 9 shown, the production process of the cold heading production line includes:

[0057] S1. Drawing out: The metal wire 130 is drawn out through the rolling device 200 and installed on the active traction mechanism 400.

[0058] S2. First rolling: The rolling device 200 rotates to adjust the stepped rolling cavity 220 to the required rolling diameter. Here, the pressure roller 210 needs to rotate counterclockwise because clockwise rotation will give the metal wire 130 a traction force toward the active traction mechanism 400. Then, the active traction mechanism 400 traction the metal wire 130 forward. After advancing a specific distance, the active traction mechanism 400 stops traction. The specific distance advanced is the length of this section of diameter.

[0059] S3. Circular rolling: Repeat S2, but before each time, the stepped rolling cavity 220 is adjusted to another required rolling diameter, and it also needs to rotate counterclockwise. Finally, the metal wire 130 is rolled into a metal wire 130 with a multi-step structure of 210, as Figure 1-2 shown.

[0060] S4. Cutting: When the rolled metal wire 130 in step S3 reaches the cutting mechanism 300, it is cut. The specific cutting position can be cut at the outer diameter change as shown in Figure 1-2 , or cut at the same outer diameter section.

[0061] S5. Cold heading: The metal wire rod 130 cut in step S4 falls into the conveying device 510 and is then conveyed into the cold heading machine 500 for cold heading forming. Since the cut metal wire already has a rough outer diameter change, generally only a single cold heading forming is required.

[0062] Example 2

[0063] As Figure 10 shown, the difference between this embodiment and Embodiment 1 is that: a heating device 600 is provided between the wire storage device 100 and the rolling device 200 to heat the metal wire rod 130, facilitating forming in the rolling device 200. An air cooling device 700 is provided between the rolling device 200 and the traction cutting device, enabling the heated metal wire rod 130 to cool rapidly and restore its original strength.

[0064] This embodiment can be used for metal wire rods 130 with poor plasticity at room temperature, while Embodiment 1 can only be used for metal wire rods 130 with good plasticity at room temperature.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A production process for a cold heading production line, characterized in that: The cold heading production line includes a wire storage device, a rolling device, a traction cutting device and a cold heading machine arranged in sequence; A metal wire is arranged on the wire storage device; A stepped rolling cavity is provided on the rolling device; The traction cutting device includes a cutting mechanism and a main traction mechanism. The main traction mechanism is on the side close to the rolling device, and the cutting mechanism is arranged close to the cold heading machine; A conveying device is arranged between the cold heading machine and the cutting mechanism; The rolling device includes two meshing rollers. Stepped rolling cavities are circumferentially arranged on the cylindrical surfaces of the two rollers, and the edges of the two stepped rolling cavities coincide with each other; The production process of the cold heading production line includes: S1. Drawing out: Drawing out the metal wire through the rolling device and installing it on the main traction mechanism; S2. First rolling: The rolling device rotates, adjusts the stepped rolling cavity to the required rolling diameter. Here, the rollers need to rotate counterclockwise, and then the main traction mechanism pulls the metal wire forward. After advancing a specific distance, the main traction mechanism stops pulling; S3. Circular rolling: Repeat S2, but before each time, the stepped rolling cavity is adjusted to another required rolling diameter, and finally the metal wire is rolled into a metal wire with a multi-step structure; S4. Cutting: Cutting is performed when the rolled metal wire in step S3 reaches the cutting mechanism; S5. Cold heading: The metal wire cut in step S4 falls into the conveying device and is then conveyed into the cold heading machine for cold heading forming.

2. The production process for a cold heading production line according to claim 1, characterized in that: The two rollers are drivingly connected to a shared rolling motor.

3. The production process for a cold heading production line according to claim 1, characterized in that: The main traction mechanism includes at least two groups of traction wheel sets, and a shared spacing slide rail is arranged under all the traction wheel sets.

4. The production process for a cold heading production line according to claim 3, characterized in that: Each traction wheel set includes two symmetrically arranged traction wheels. A traction motor is connected to each traction wheel. A shared width slide rail is arranged under the two traction wheels. The width slide rail is arranged in the spacing slide rail, and stoppers are arranged on both sides of the width slide rail. Compression springs are arranged between the stoppers and the traction wheels.

5. The production process for a cold heading production line according to claim 1, characterized in that: The cutting mechanism includes a punching machine and a punching platform arranged under the punching machine. A cutting edge is arranged on the punching machine, and the punching platform is inclined towards the conveying device.

6. The production process for a cold heading production line according to claim 5, characterized in that: The punching platform is provided with a sensor, and a telescopic rod for adjusting the vertical distance from the punching platform is arranged under the sensor.

7. The production process for a cold heading production line according to claim 1, characterized in that: The rolling device, the cutting mechanism and the main traction mechanism are controlled by a shared control system.

8. The production process for a cold heading production line according to claim 1, characterized in that: The conveying device is a vibrating disk, and the end of the vibrating disk is communicated with the cold heading machine.

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