Cold extrusion die for simultaneously forming external tooth profile and internal straight spline

Abstract

When parts with external tooth profiles and internal straight splines are produced at the same time, a traditional production process comprises the steps of round bar material processing, blank processing, external tooth profile extruding, drilling, turning and internal spline pulling, and has the defects that a large number of devices are needed, the production time is long, and the cost is high. The utility model provides a metal precision forming die, and particularly relates to a cold extrusion die for simultaneously forming an outer tooth profile and an inner straight spline, which comprises an upper female die pre-tightening ring, a locking bolt, a lower female die pre-tightening ring, a cushion block, an ejector rod, an ejector block, an upper female die core, an outer tooth profile female die, a middle sleeve, a positioning block and an inner spline male die. The cold extrusion die for simultaneously forming the outer tooth profile and the inner straight spline is used, so that the outer tooth profile and the inner straight spline of a part are extruded and formed at one step, the product precision is ensured, the manufacturing process of the product can be completed only through one lathing procedure subsequently, the material loss is reduced, the delivery time is shortened, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to a metal precision forming die, in particular to a cold extrusion die for simultaneously forming an external tooth shape and an internal straight spline. Background Art

[0002] Cold extrusion technology is often used in mass production of automotive parts. When producing parts with both external gears and internal straight splines, the traditional production process is round bar material-blank processing-extrusion of external gears-drilling-turning-drawing internal splines. The disadvantage is that it requires more equipment, and the production time is long and the cost is high. Summary of the invention

[0003] In order to solve the above problems, the utility model provides a cold extrusion die for simultaneously forming an external tooth shape and an internal straight spline.

[0004] The technical solution adopted by the utility model is:

[0005] The cold extrusion die for simultaneously forming the external tooth shape and the internal straight spline comprises an upper die preload ring, a locking bolt, a lower die preload ring, a cushion block, an ejector rod, an ejector block, an upper die core, an external tooth shape die, an intermediate sleeve, a positioning block and an internal spline punch; there are a plurality of ejector rods; a plurality of holes having the same shape as the ejector rods are arranged in the middle area of ​​the positioning block, and the number of holes is the same as the number of the ejector rods; all the ejector rods pass through the holes of the positioning block and are installed in the holes; the positioning block is installed on the cushion block; the ejector block is installed Installed in the hole of the cushion block and in contact with the ejector rod; the external toothed die is installed on the positioning block; the intermediate sleeve is sleeved on the outside of the positioning block and the external toothed die; the lower die preload ring is sleeved on the outside of the intermediate sleeve; the internal spline punch is installed on the positioning block and is located in the middle of all the ejector rods; the upper die core is installed on the intermediate sleeve; the upper die preload ring uses a conical surface to press the upper die core and is connected to the lower die preload ring through a plurality of locking bolts.

[0006] The beneficial effect of the utility model is that a cold extrusion die is used to simultaneously form the external tooth shape and the internal straight spline, so that the external tooth shape and the internal straight spline of the part are extruded together, thereby ensuring the product accuracy. Only one subsequent turning process is required to complete the manufacturing process of the product, thereby reducing material loss, shortening delivery time, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The following is further described in conjunction with the figures of the present utility model:

[0008] Figure 1 It is a schematic diagram of the structure of the utility model.

[0009] In the figure, 1. upper die preload ring, 2. locking bolt, 3. lower die preload ring, 4. spacer, 5. ejector rod, 6. ejector block, 7. upper die core, 8. external toothed die, 9. intermediate sleeve, 10. positioning block, 11. internal spline punch. DETAILED DESCRIPTION

[0010] The cold extrusion die for simultaneously forming the external tooth shape and the internal straight spline comprises an upper die preload ring 1, a locking bolt 2, a lower die preload ring 3, a cushion block 4, an ejector rod 5, an ejector block 6, an upper die core 7, an external toothed die 8, an intermediate sleeve 9, a positioning block 10 and an internal spline punch 11; there are a plurality of ejector rods 5; a plurality of holes having the same shape as the ejector rods 5 are arranged in the middle area of ​​the positioning block 10, and the number of holes is the same as the number of the ejector rods 5; all the ejector rods 5 pass through the holes of the positioning block 10 and are installed in the holes; the positioning block 10 is installed on the cushion block 4; the ejector block 6 is installed in the hole of the cushion block 4 and contacts the ejector rod 5; the external toothed die 8 is installed on the positioning block 10; the intermediate sleeve 9 is sleeved on the outside of the positioning block 10 and the external toothed die 8; the lower die preload ring 3 is sleeved on the outside of the intermediate sleeve 9; the internal spline punch 11 is installed on the positioning block 10 and is located in the middle of all the ejector rods 5; the upper die core 7 is installed on the intermediate sleeve 9; the upper die preload ring 1 uses a conical surface to press the upper die core 7 and is connected to the lower die preload ring 3 through a plurality of locking bolts 2.

[0011] When using the cold extrusion die for simultaneously forming the external tooth shape and the internal straight spline, it is only necessary to put the blank into the upper die core 7, and under the action of the hydraulic press punch, the blank is extruded from top to bottom, so that the external tooth shape and the internal straight spline are extruded and formed at the same time; then, under the action of the hydraulic press ejector, the ejector block 6 is driven, and then the ejector rod 5 is pushed to push the formed part out of the upper die core 7, and finally the extrusion forming of the part is completed.

[0012] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A cold extrusion die for simultaneously forming an external tooth profile and an internal straight spline, comprising an upper die preload ring, a locking bolt, a lower die preload ring, a cushion block, an ejector rod, an ejector block, an upper die core, an external tooth profile die, an intermediate sleeve, a positioning block and an internal spline punch; wherein: There are a plurality of ejector rods; a plurality of holes having the same shape as the ejector rods are arranged in the middle area of ​​the positioning block, and the number of holes is the same as the number of the ejector rods; all the ejector rods pass through the holes of the positioning block and are installed in the holes; the positioning block is installed on the cushion block; the ejector block is installed in the hole of the cushion block and contacts the ejector rods; the external toothed die is installed on the positioning block; the intermediate sleeve is sleeved on the outside of the positioning block and the external toothed die; the lower die preload ring is sleeved on the outside of the intermediate sleeve; the internal spline punch is installed on the positioning block and is located in the middle of all the ejector rods; the upper die core is installed on the intermediate sleeve; the upper die preload ring uses a conical surface to press the upper die core and is connected to the lower die preload ring through a plurality of locking bolts.

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