Cold heading die for gear standard component

Abstract

The cold heading die comprises a first die, a second die, a third die, a fourth die and a fifth die, and each of the first die, the second die, the third die, the fourth die and the fifth die comprises a stamping die unit connected with the moving end of a cold heading machine and a main die unit connected with the fixed end of the cold heading machine; the stamping die units of the first die, the second die, the third die and the fourth die respectively comprise an upper die connected with the moving end of the cold header, a rear stamping pad arranged in the upper die and a stamping rod. Main die units of the first die, the second die, the third die and the fourth die respectively comprise a lower die connected with the fixed end of the cold header, an ejector rod connected into the lower die in a sliding mode, a die sleeve arranged at the rear end of the lower die and a T-shaped pad connected with the rear end of the ejector rod, and a die cavity is formed in the front end of the lower die; the stamping die unit of the fifth die comprises an upper die connected with the moving end of the cold header, a rear stamping pad arranged in the upper die and a waste stamping and removing pipe. The cold heading die and the cold heading technology are adopted for replacing cutting machining, automatic production is achieved, and the production efficiency is high.

Description

Technical Field

[0001] The present application relates to the field of cold heading dies, and in particular to a cold heading die for a gear standard part. Background Art

[0002] Standard gears refer to gears whose parameters meet standard values. Standard gears for different purposes are manufactured according to different standards. Standard gears are often used as reference samples for measuring gears, for producing gears, or for calibrating measuring instruments. Gear blanks refer to the blanks used to make gear transmission components such as gears and transmission shafts during the machining process.

[0003] Gear blanks are usually made of metal materials and have a certain size, shape and number of teeth, but have not been processed carefully and accurately. They need further processing before they can be used to produce mechanical transmission parts. In related technologies, gear blanks are processed by cold heading solid rough blanks + machining. Gear blanks are processed by cold heading solid rough blanks, machining, and CNC finishing.

[0004] With respect to the above-mentioned related technologies, the inventors believe that this process has low production efficiency, requires multiple processing steps, and has high labor costs. Utility Model Content

[0005] In order to improve production efficiency, the present application provides a cold heading die for a gear standard part.

[0006] The present application provides a cold heading die for a gear standard part, which adopts the following technical solution:

[0007] A cold heading die for a gear standard part, comprising a first die, a second die, a third die, a fourth die and a fifth die which are arranged on a cold heading machine and are located at different workstations, wherein the first die, the second die, the third die, the fourth die and the fifth die all comprise a punching die unit connected to a moving end of the cold heading machine and a main die unit connected to a fixed end of the cold heading machine; the punching die units of the first die, the second die, the third die and the fourth die all comprise an upper die connected to a moving end of the cold heading machine, a punching back pad and a punching rod arranged in the upper die, and the first die The main die units of the No. 1, No. 2, No. 3 and No. 4 die all include a lower die connected to the fixed end of the cold heading machine, a push rod slidably connected to the lower die, a die sleeve arranged at the rear end of the lower die and a T-shaped pad connected to the rear end of the push rod, and the front end of the lower die is a die cavity; the punch unit of the No. 5 die includes an upper die connected to the moving end of the cold heading machine, a punch back pad and a punching waste pipe arranged in the upper die, and the main die unit of the No. 5 die includes a lower die connected to the fixed end of the cold heading machine, a push rod slidably connected to the lower die, a die sleeve arranged at A die sleeve at the rear end of the lower die, a T-shaped pad connected to the rear end of the ejector rod, and a punch sleeve with a sliding sleeve arranged on the outer side of the ejector rod; in the No. 1 die, a first outer protrusion is arranged at the end of the punch rod away from the punch pad, and a first inner groove is arranged at the bottom of the lower die cavity; in the No. 2 die, a second left inner groove is arranged at the end of the punch rod away from the punch pad, and a second right inner groove is arranged at the lower die cavity; in the No. 3 die, a first pull block is arranged at the middle of the end of the punch rod away from the punch pad, and the end of the ejector rod away from the T-shaped pad is provided with a first pull block. A second pull block is arranged in the middle, and the size of the first pull block is larger than that of the second pull block; in the No. 4 mold, a third pull block is arranged in the middle of the end of the punch rod away from the rear pad, and a fourth pull block is arranged in the middle of the end of the top rod away from the T-shaped pad, and the size of the fourth pull block is the same as that of the first pull block, and the size of the third pull block is larger than that of the fourth pull block; in the No. 5 mold, an upper waste port is opened in the middle of the punching waste pipe, and a lower waste port connected to the upper waste port is opened in the upper mold.

[0008] By adopting the above technical scheme, cold heading dies and cold heading technology are used instead of cutting processing to achieve automated production with high production efficiency. Cold heading utilizes the plastic deformation of metal to form the desired shape with high material utilization. Cold heading is a precision forming technology with relatively high surface roughness and dimensional accuracy. The cold working hardening of the metal after cold extrusion and the formation of a reasonable fiber streamline distribution inside the part make the strength of the part much higher than that of the raw material.

[0009] Optionally, in mold No. 1, the angle of the first outer protrusion of the punch is 150°~170°, the first inner groove of the lower mold cavity is truncated cone-shaped, and the angle of the first inner groove is 150°.

[0010] By adopting the above technical solution, the first outer protrusion of the punch rod is concave on the workpiece, and the first inner groove of the lower die cavity is convex on the workpiece, so that the force of the punch rod is dispersed during extrusion, thereby increasing the service life of the punch rod.

[0011] Optionally, in mold No. 2, the second left inner groove and the second right inner groove are both truncated cone-shaped, and the angles of the second left inner groove and the second right inner groove are both 155°.

[0012] By adopting the above technical solution, the second left inner groove and the second right inner groove are arranged so that the two end surfaces of the workpiece have an upper ball mold and a lower ball mold respectively.

[0013] Optionally, in the third mold, edge blocks are provided in a ring shape at the edge positions of the ends of the punch rod and the ejector rod that are close to each other.

[0014] By adopting the above technical solution, the edge blocks on the punch rod and the ejector rod process the outer edge of the workpiece and form a chamfer.

[0015] Optionally, in mold No. 4, a fourth external protrusion protruding outward is provided at the end of the push rod.

[0016] By adopting the above technical solution, the fourth outer protrusion forms a first concave surface on the end face of the workpiece, which can increase the contact area between the end of the push rod and the end face of the workpiece, disperse the force when the push rod is squeezed, and increase the service life of the push rod.

[0017] Optionally, in die No. 4, a marking block is provided at the end of the punch.

[0018] By adopting the above technical solution, the marking block of the punch rod processes the end face of the workpiece and forms a marking surface.

[0019] Optionally, in the fifth die, the end of the punch sleeve is provided with a fifth outer protrusion protruding outward.

[0020] By adopting the above technical solution, the fifth outer protrusion forms a second concave surface on the end face of the workpiece, which can increase the contact area between the end of the punch sleeve and the end face of the workpiece, disperse the force when the punch sleeve is extruded, and thus increase the service life of the punch sleeve.

[0021] Optionally, surfaces of the first pulling block, the second pulling block, the third pulling block and the fourth pulling block are all provided with a titanium coating layer.

[0022] By adopting the above technical solution, the provision of the titanium plating layer can improve the hardness, wear resistance and corrosion resistance of the surfaces of the first pull block, the second pull block, the third pull block and the fourth pull block.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Cold heading is to use the plastic deformation of metal to form the desired shape, with high material utilization rate. Cold heading is a precision forming technology process with high surface roughness and dimensional accuracy. The cold working hardening of the metal after cold extrusion and the formation of a reasonable fiber streamline distribution inside the part make the strength of the part much higher than that of the raw material.

[0025] 2. The provision of the titanium plating layer can improve the hardness, wear resistance and corrosion resistance of the surfaces of the first pulling block, the second pulling block, the third pulling block and the fourth pulling block. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the shearing of the cold heading die of the gear standard part;

[0027] Figure 2 This is a cross-sectional view of die No. 1 of the cold heading die for standard gear parts;

[0028] Figure 3 It is a schematic diagram of workpiece No. 1 of the cold heading die of the gear standard part;

[0029] Figure 4 This is a cross-sectional view of the No. 2 die of the cold heading die for standard gear parts;

[0030] Figure 5 It is a schematic diagram of workpiece No. 2 of the cold heading die for standard gear parts;

[0031] Figure 6 This is a cross-sectional view of the No. 3 die of the cold heading die for standard gear parts;

[0032] Figure 7 This is a cross-sectional view of workpiece No. 3 of the cold heading die for standard gear parts;

[0033] Figure 8 This is a cross-sectional view of the No. 4 die of the cold heading die for standard gear parts;

[0034] Fig. 9 This is a cross-sectional view of workpiece No. 4 of the cold heading die for standard gear parts;

[0035] Fig.10 This is a cross-sectional view of the No. 5 die of the cold heading die for standard gear parts;

[0036] Fig.11 This is a cross-sectional view of workpiece No. 5 of the cold heading die for standard gear parts.

[0037] Description of reference numerals: 1. Die No. 1; 2. Die No. 2; 3. Die No. 3; 4. Die No. 4; 5. Die No. 5; 6. Workpiece; 601. Upper ball die; 602. Lower ball die; 603. First pulling hole; 604. Second pulling hole; 605. Third pulling hole; 606. Inner concave surface; 607. Outer convex surface; 608. Marking surface; 609. Chamfer; 610. First concave surface; 611. Second concave surface; 612. Through hole; 11. Punch die unit; 110. Punch back pad; 111. Punch rod; 1110. First pulling block; 1111. Third pulling block; 1112, first outer protrusion; 1113, first inner groove; 1114, second left inner groove; 1115, second right inner groove; 1116, edge block; 1117, marking block; 1118, fourth outer protrusion; 1119, fifth outer protrusion; 112, upper mold; 12, main mold unit; 120, lower mold; 121, ejector rod; 1210, second pull block; 1211, fourth pull block; 122, mold sleeve; 123, T-type pad; 124, punching and removing waste pipe; 1240, upper waste port; 1241, lower waste port; 125, punching sleeve. DETAILED DESCRIPTION

[0038] The following is combined with Figures 1 to 11 This application is described in further detail.

[0039] The embodiment of the present application discloses a cold heading die for a gear standard part. Figure 1 and Figure 2 The cold heading dies for the gear standard parts include die No. 1, die No. 2, die No. 3, die No. 4, and die No. 5. The die No. 1, die No. 2, die No. 3, die No. 4, and die No. 5 are installed at different positions on the cold heading machine. The die No. 1, die No. 2, die No. 3, die No. 4, and die No. 5 successively process the workpiece 6 and process the workpiece 6 into a gear blank.

[0040] Die No. 1 1, Die No. 2 2, Die No. 3 3, Die No. 4 4, Die No. 5 5 all include a punch unit 11 and a main die unit 12; the punch unit 11 is installed at the moving end of the cold heading machine, and the main die unit 12 is installed at the fixed end of the cold heading machine. The punch unit 11 of Die No. 1 1, Die No. 2 2, Die No. 3 3, Die No. 4 4 all include a back-punching pad 110, a punch rod 111, and an upper die 112, the upper die 112 is fixedly installed at the moving end of the cold heading machine, the upper die 112 is hollow, the back-punching pad 110 and the punch rod 111 both penetrate and extend into the upper die 112, the back-punching pad 110 and the punch rod 111 are fixedly connected to the upper die 112, the punch rod 111 is located at the front end of the back-punching pad 110, and the end of the punch rod 111 away from the back-punching pad 110 extends out of the upper die 112, so as to facilitate the corresponding processing of the workpiece 6.

[0041] The main die units 12 of the No. 1 die 1, the No. 2 die 2, the No. 3 die 3, and the No. 4 die 4 all include a lower die 120, a push rod 121, a die sleeve 122, and a T-shaped pad 123. The lower die 120 is fixedly installed at the fixed end of the cold heading machine. The front end of the lower die 120 is a die cavity, and the rear end of the lower die 120 is a hollow setting. The die sleeve 122 is fixed to the rear end of the lower die 120, and the die sleeve 122 is also a hollow setting. The push rod 121 is slidably connected to the rear end of the lower die 120, and the T-shaped pad 123 is slidably connected in the die sleeve 122. The push rod 121 and the T-shaped pad 123 are fixedly connected. The push rod 121 is located at the front end of the T-shaped pad 123, and the end of the T-shaped pad 123 away from the push rod 121 is connected to the push rod in the cold heading machine. It should be noted that the push rod in the cold heading machine is the prior art.

[0042] In mold No. 1, a first outer protrusion 1112 is integrally formed at one end of the punch rod 111 away from the punch back pad 110. The first outer protrusion 1112 is conical in shape, and the angle of the first outer protrusion 1112 of the punch rod 111 is 150°~170°. The bottom of the mold cavity of the lower mold 120 is set as a first inner groove 1113. The first inner groove 1113 is truncated cone-shaped, and the angle of the first inner groove 1113 is 150°.

[0043] Reference Figure 2 and Figure 3 , the wire wheel mechanism pulls in the wire, passes through the wire die, the backing plate holds the wire in place, the cutting mechanism operates, cuts the wire according to size, the transmission mechanism clamps the cut material, and transmits it to the predetermined position of the first die 1. At this time, the workpiece 6 is a cylindrical shear, and the length of the workpiece 6 is 35.6mm, the diameter is 29.2mm, and the mass is 187g. It should be noted that the wire wheel mechanism, the backing plate, the cutting mechanism and the transmission mechanism are all internal structures of the cold heading machine, and the cold heading machine is a prior art.

[0044] The punch unit 11 moves as a whole, and the punch rod 111 pushes the workpiece 6 into the cavity of the lower die 120. The main die unit 12 is fixed on the cold heading machine. The first outer protrusion 1112 of the punch rod 111 concave the workpiece 6, and the first inner groove 1113 of the cavity of the lower die 120 convexes the workpiece 6. After the operation is completed, the punch unit 11 retreats and resets, and the workpiece 6 is pushed out by the push rod 121. The clamping mechanism of the cold heading machine automatically clamps the workpiece 6 and transfers the workpiece 6 to the predetermined position of the second die 2. At this time, the two ends of the workpiece 6 have an inner concave surface 606 and an outer convex surface 607 respectively, and the overall length of the workpiece 6 is 36.3 mm, the diameter is 29.6 mm, the outer convex surface 607 is truncated cone-shaped, the upper bottom surface diameter of the outer convex surface 607 is 21 mm, and the angle of the outer convex surface 607 is 150°. It should be noted that the angle of the inner concave surface 606 is 150°~170°. The setting of the inner concave surface 606 can increase the contact area between the end of the punch rod 111 and the end face of the workpiece 6, so that the force of the punch rod 111 is dispersed during extrusion, so as to increase the service life of the punch rod 111, and the setting of the outer convex surface 607 facilitates the formation of the lower ball mold 602 in the next step.

[0045] Reference Figure 4 and Figure 5 In mold No. 2, a second left inner groove 1114 is provided at the end of the punch rod 111 away from the punch back pad 110, and a second right inner groove 1115 is provided at the bottom of the mold cavity of the lower mold 120. The second left inner groove 1114 and the second right inner groove 1115 are both truncated cone-shaped, and the angles of the second left inner groove 1114 and the second right inner groove 1115 are both 155°.

[0046] The punch unit 11 moves as a whole, and the punch rod 111 pushes the workpiece 6 into the cavity of the lower die 120. The punch rod 111 bulges the workpiece 6 and thickens the workpiece 6. The main die unit 12 is fixed on the cold heading machine. After the operation is completed, the punch unit 11 retreats and resets, and the workpiece 6 is pushed out by the push rod 121. The clamp mechanism of the cold heading machine automatically clamps the workpiece 6 and transfers the workpiece 6 to the predetermined position of the third die 3. At this time, the diameter of the workpiece 6 increases and the thickness decreases. The second left inner groove 1114 and the second right inner groove 1115 are set so that The two end faces of the workpiece 6 have an upper ball mold 601 and a lower ball mold 602, respectively, and the overall length of the workpiece 6 is 18 mm, the diameter is 46 mm, the diameter error is within 0.05 mm, the length of the workpiece 6 minus the length of the upper ball mold 601 and the lower ball mold 602 is 12.5 mm, the upper ball mold 601 and the lower ball mold 602 are both truncated cone-shaped, the diameter of the upper bottom surface of the upper ball mold 601 is 21.5 mm, the diameter of the lower bottom surface of the lower ball mold 602 is 21 mm, and the angles of the upper ball mold 601 and the lower ball mold 602 are both 155°. It should be noted that the setting of the upper ball mold 601 and the lower ball mold 602 is to prepare for the next process to press the two ends of the workpiece 6 into a plane, and the setting of the upper ball mold 601 and the lower ball mold 602 can also increase the contact area between the workpiece 6 and the punch 111 and the lower mold 120 cavity, respectively, so that the force of the punch 111 is dispersed during extrusion to increase the service life of the punch 111.

[0047] Reference Figure 6 and Figure 7 In the No. 3 mold 3, a first pull block 1110 is integrally formed at the middle of one end of the punch rod 111 away from the punch back pad 110, and a second pull block 1210 is integrally formed at the middle of one end of the push rod 121 away from the T-shaped pad 123. The size of the first pull block 1110 is larger than that of the second pull block 1210, and edge blocks 1116 are integrally formed at the edge positions of the ends of the punch rod 111 and the push rod 121 that are close to each other, and the edge block 1116 is arranged in a ring shape.

[0048] The punch unit 11 moves as a whole, the punch rod 111 pushes the workpiece 6 into the cavity of the lower die 120, the punch rod 111 flattens the upper ball die 601, and the cavity of the lower die 120 flattens the lower ball die 602, the punch rod 111 pre-draws holes on the workpiece 6, the main die unit 12 is fixed on the cold heading machine, the top rod 121 pre-draws holes on the workpiece 6, the punch rod 111 and the edge block 1116 on the top rod 121 process the outer edge of the workpiece 6 and form a chamfer 609, after the operation is completed, the punch unit 11 retreats and resets, the top rod 121 pushes the workpiece 6 out, and the clamp mechanism of the cold heading machine automatically clamps the workpiece Workpiece 6 is rotated 180° and then transferred to the predetermined position of the fourth mold 4. The first pull block 1110 and the second pull block 1210 are set so that the two end faces of the workpiece 6 have the first pull hole 603 and the second pull hole 604 respectively, and the length of the workpiece 6 is 15mm, the diameter is 46.1mm, the diameter error is within 0.05mm, the plane diameter of the workpiece 6 minus the chamfer 609 is 42.4mm, the depth of the first pull hole 603 is 3.5mm, the depth of the second pull hole 604 is 3mm, and the angle between the chamfer 609 surface and the circumferential surface of the workpiece 6 is 65°. It should be noted that this step flattens the upper ball mold 601 and the lower ball mold 602, so that the two ends of the workpiece 6 are planes, and the length of the workpiece 6 is controlled within the specified range, so that the length of the workpiece 6 can also be controlled within the specified range during subsequent punching. In this step, the setting of the chamfer 609 is completed together, which can save the subsequent steps of processing the chamfer 609 separately.

[0049] Reference Figure 8 and Fig. 9 In the No. 4 mold 4, a third pull block 1111 is integrally formed at the middle of one end of the punch rod 111 away from the punch back pad 110, and a fourth pull block 1211 is integrally formed at the middle of one end of the push rod 121 away from the T-shaped pad 123. The size of the fourth pull block 1211 is the same as that of the first pull block 1110, the size of the third pull block 1111 is larger than that of the fourth pull block 1211, a fourth outward protrusion 1118 protruding outward is integrally formed at the end of the push rod 121, and a marking block 1117 is integrally formed at the end of the punch rod 111.

[0050] The punch unit 11 moves as a whole, the punch rod 111 pushes the workpiece 6 into the cavity of the lower die 120, the marking block 1117 of the punch rod 111 processes the end face of the workpiece 6 and forms a marking surface 608, the push rod 121 processes the end face of the workpiece 6, the fourth outer protrusion 1118 forms a first concave surface 610 concave inwardly on the end face of the workpiece 6, the third pulling block 1111 of the push rod 121 pulls the second pulling hole 604 of the workpiece 6 to form a third pulling hole 605, the main die unit 12 is fixed on the cold heading machine, and after the operation is completed, the punch unit 11 retreats and resets, and the push rod 121 pulls the workpiece 6 is pushed out, and the clamping mechanism of the cold heading machine automatically clamps the workpiece 6, rotates the workpiece 6 180° and then transmits it to the predetermined position of the No. 5 mold 5. At this time, the two end surfaces of the workpiece 6 respectively have the first pulling hole 603 and the third pulling hole 605, and the length of the workpiece 6 is 15.3mm, the diameter is 46.2mm, the diameter error is within 0.05mm, the plane diameter of the workpiece 6 minus the chamfer 609 is 42.4mm, the depth of the third pulling hole 605 is 5.5mm, the angle between the chamfer 609 surface and the circumferential surface of the workpiece 6 is 65°, and the angle of the first recessed surface 610 is 1°~1.5°. It should be noted that the setting of the first recessed surface 610 can increase the contact area between the end of the push rod 121 and the end face of the workpiece 6, so that the force of the push rod 121 is dispersed when it is extruded, so as to increase the service life of the push rod 121. In this step, the second pulling hole 604 can be pulled to form a third pulling hole 605 with a deeper depth. In order to prepare for the subsequent through hole 612, the setting of the marking surface 608 is convenient for distinguishing the front and back sides when the tooth shape of the workpiece 6 is subsequently processed. In this step, the setting of the marking surface 608 is completed together, which can save the subsequent step of separately processing the marking surface 608, thereby saving expenses in the next processing step.

[0051] It should be noted that the surfaces of the first pull block 1110, the second pull block 1210, the third pull block 1111 and the fourth pull block 1211 are all provided with a titanium coating. The provision of the titanium coating can improve the hardness, wear resistance and corrosion resistance of the surfaces of the first pull block 1110, the second pull block 1210, the third pull block 1111 and the fourth pull block 1211.

[0052] Reference Fig.10 and Fig.11The die unit 11 of the fifth die 5 includes a back-punching pad 110, a waste pipe 124, and an upper die 112. The upper die 112 is fixedly mounted on the moving end of the cold heading machine. The upper die 112 is hollow. The back-punching pad 110 and the waste pipe 124 both penetrate and extend into the upper die 112. The back-punching pad 110 and the waste pipe 124 are both fixedly connected to the upper die 112. The waste pipe 124 is located at the front end of the back-punching pad 110, and the One end of the waste pipe 124 away from the punching back pad 110 extends out of the upper mold 112. The waste pipe 124 is hollow. An upper waste port 1240 is provided in the middle of the waste pipe 124. The upper mold 112 is provided with a lower waste port 1241 that cooperates with the upper waste port 1240. The lower waste port 1241 is located below the upper waste port 1240, and the two are connected to each other. The upper waste port 1240 and the lower waste port 1241 are used for waste discharge.

[0053] The main die unit 12 of the No. 5 die 5 includes a lower die 120, a push rod 121, a punch sleeve 125, a die sleeve 122, and a T-shaped pad 123. The lower die 120 is fixedly installed at the fixed end of the cold heading machine. The front end of the lower die 120 is a die cavity, and the rear end of the lower die 120 is a hollow setting. The die sleeve 122 is fixed to the rear end of the lower die 120, and the die sleeve 122 is also a hollow setting. The push rod 121 is slidably connected to the rear end of the lower die 120, and the T-shaped pad 123 is slidably connected in the die sleeve 122. The push rod 121 and the T-shaped pad 123 are fixed. Connection, the push rod 121 is located at the front end of the T-shaped pad 123, the end of the T-shaped pad 123 away from the push rod 121 is connected to the push rod in the cold heading machine, the push rod 121 is slidably matched with the middle part of the waste punching pipe 124, the punch sleeve 125 is slidably connected between the rear end of the lower die 120 and the die sleeve 122, the punch sleeve 125 is slidably sleeved on the outside of the push rod 121, the punch sleeve 125 and the T-shaped pad 123 are respectively connected to two independent push rods in the cold heading machine, and the end of the punch sleeve 125 is integrally formed with a fifth external protrusion 1119 protruding outward.

[0054] The punch unit 11 moves as a whole, and the waste punching tube 124 pushes the workpiece 6 into the cavity of the lower die 120. The main die unit 12 is fixed on the cold heading machine, and the punch sleeve 125 processes the end face of the workpiece 6. The fifth outer protrusion 1119 forms a second recessed surface 611 recessed inwardly on the end face of the workpiece 6. The push rod 121 passes the waste into the waste punching tube 124. After the operation is completed, the punch unit 11 retreats and resets, and the workpiece 6 is pushed out by the punch sleeve 125. At this time, the first pulling hole 603 and the third pulling hole 605 of the workpiece 6 are connected to form a through hole 612, and the length of the workpiece 6 is 15.1~15.4mm, the diameter is 46.2~46.4mm, the diameter of the through hole 612 is 14~14.1mm, and the angle of the second recessed surface 611 is 0.5°~1°. It should be noted that the provision of the second recessed surface 611 can increase the contact surface between the end of the punch sleeve 125 and the end surface of the workpiece 6 , so that the force of the punch sleeve 125 is dispersed during extrusion, thereby increasing the service life of the punch sleeve 125 .

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cold heading die for standard gear parts, characterized in that: The invention comprises a first die (1), a second die (2), a third die (3), a fourth die (4) and a fifth die (5) which are arranged on a cold heading machine and are located at different workstations. The first die (1), the second die (2), the third die (3), the fourth die (4) and the fifth die (5) all comprise a punching die unit (11) connected to a moving end of the cold heading machine and a main die unit (12) connected to a fixed end of the cold heading machine. The punching die units (11) of the first die (1), the second die (2), the third die (3) and the fourth die (4) all comprise an upper die (112) connected to a moving end of the cold heading machine, a punching back pad (110) and a punching rod (111) arranged in the upper die (112). The main die unit (12) of the No. 5 die (4) comprises a lower die (120) connected to the fixed end of the cold heading machine, a push rod (121) slidably connected to the lower die (120), a die sleeve (122) arranged at the rear end of the lower die (120), and a T-shaped pad (123) connected to the rear end of the push rod (121), and the front end of the lower die (120) is a die cavity; the punching die unit (11) of the No. 5 die (5) comprises an upper die (112) connected to the moving end of the cold heading machine, a punching back pad (110) arranged in the upper die (112), and a punching waste pipe (124), and the main die unit (12) of the No. 5 die (5) comprises a lower die (120) connected to the fixed end of the cold heading machine, a push rod (121) slidably connected to the lower die (120), and a T-shaped pad (123) connected to the rear end of the push rod (121). 21), a die sleeve (122) arranged at the rear end of the lower die (120), a T-shaped pad (123) connected to the rear end of the push rod (121), and a punch sleeve (125) slidably arranged on the outside of the push rod (121); in the first die (1), the end of the punch rod (111) away from the punch back pad (110) is provided with a first outer protrusion (1112), and the bottom of the die cavity of the lower die (120) is provided with a first inner groove (1113); in the second die (2), the end of the punch rod (111) away from the punch back pad (110) is provided with a second left inner groove (1114), and the die cavity of the lower die (120) is provided with a second right inner groove (1115); in the third die (3), the end of the punch rod (111) away from the punch back pad (110) is provided with a second left inner groove (1115); A first pull block (1110) is arranged at the middle of one end of the pad (110), a second pull block (1210) is arranged at the middle of one end of the push rod (121) away from the T-shaped pad (123), and the size of the first pull block (1110) is larger than the size of the second pull block (1210); in the fourth mold (4), a third pull block (1111) is arranged at the middle of one end of the punching rod (111) away from the punching pad (110), a fourth pull block (1211) is arranged at the middle of one end of the push rod (121) away from the T-shaped pad (123), the size of the fourth pull block (1211) is the same as the size of the first pull block (1110), and the size of the third pull block (1111) is larger than the size of the fourth pull block (1211);In the fifth mold (5), an upper waste opening (1240) is provided in the middle of the punching waste pipe (124), and a lower waste opening (1241) connected to the upper waste opening (1240) is provided in the upper mold (112). ; 2. The cold heading die for a gear standard part according to claim 1, characterized in that: In mold No. 1 (1), the angle of the first outer protrusion (1112) of the punch (111) is 150°~170°, the first inner groove (1113) of the mold cavity of the lower mold (120) is truncated cone-shaped, and the angle of the first inner groove (1113) is 150°.

3. The cold heading die for a gear standard part according to claim 1, characterized in that: In the second mold (2), the second left inner groove (1114) and the second right inner groove (1115) are both truncated cone-shaped, and the angles of the second left inner groove (1114) and the second right inner groove (1115) are both 155°.

4. The cold heading die for a gear standard part according to claim 1, characterized in that: In the third mold (3), edge blocks (1116) are provided in an annular manner at the edge positions of the end portions of the punch rod (111) and the ejector rod (121) that are close to each other.

5. The cold heading die for a standard gear part according to claim 1, characterized in that: In the No. 4 mold (4), the end of the push rod (121) is provided with a fourth outer protrusion (1118) protruding outward.

6. The cold heading die for a gear standard part according to claim 1, characterized in that: In the fourth mold (4), a marking block (1117) is provided at the end of the punch (111).

7. The cold heading die for a gear standard part according to claim 1, characterized in that: In the No. 5 mold (5), the end of the punch sleeve (125) is provided with a fifth outer protrusion (1119) protruding outward.

8. The cold heading die for a gear standard part according to claim 1, characterized in that: The surfaces of the first pulling block (1110), the second pulling block (1210), the third pulling block (1111) and the fourth pulling block (1211) are all provided with a titanium coating layer.

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