Cold finishing die for end face spline

Abstract

The utility model discloses a cold finishing die for an end face spline, and relates to the technical field of forge piece manufacturing. The finishing pressure block is arranged in the die sleeve, a through hole is formed in the middle of the finishing pressure block, and a plurality of mounting holes are formed in the finishing pressure block; the finishing mold core is arranged in the through hole; the spring is arranged in the mounting hole; the finishing female die is located in the die sleeve; the finishing punch is positioned above the finishing female die; according to the cold finishing die, the jumping requirement of the end face spline and the appearance of a product is met in a female die floating mode, and the machining cost is saved for follow-up machining. The end face spline is finished firstly, then machining is carried out with the end face spline as the positioning reference, and the precision requirements of the end face spline, the appearance and the inner cavity size are improved.

Description

Technical Field

[0001] The invention relates to the technical field of forging manufacturing, in particular to a cold finishing die for an end face spline. Background Art

[0002] With the development of the times, cost reduction and energy saving of automobiles have become a trend. As an important part of the automobile, the transmission system also needs to be improved. The face spline outer star wheel was born in this development process. The face spline is lighter and more convenient to connect than the traditional spline. However, higher requirements are put forward in the processing technology of the face spline. In the past, the processing method of the face spline was used for processing, which had a long process and complicated processing. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art and provide a cold finishing die for end face splines.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0005] A cold finishing die for an end face spline, comprising:

[0006] Mold sets;

[0007] A finishing pressure block is arranged in the mold sleeve, a through hole for placing a finishing mold core is opened in the middle of the finishing pressure block, and a plurality of mounting holes are opened on the finishing pressure block;

[0008] A finishing mold core is arranged in the through hole;

[0009] A spring is arranged in the mounting hole, and the axis of the spring extends in the vertical direction;

[0010] A finishing die is located in the die sleeve and is placed on the upper end of the spring;

[0011] and, a finishing punch, located above the finishing die.

[0012] As a preferred solution of the cold finishing die of the end face spline of the present invention, a plurality of mounting holes are evenly arranged on a circumference with the center of the through hole as the center, and the distance between the axis of any mounting hole and the axis of the through hole is equal.

[0013] As a preferred solution of the cold finishing die of the end face spline of the present invention, in which: in the natural extension state, the upper end of the spring is higher than the upper end surface of the finishing pressure block.

[0014] As a preferred solution of the cold finishing die of the end face spline of the present invention, a positioning groove is provided on the side of the finishing die core, and a positioning convex block matching the positioning groove is provided on the inner side of the finishing pressure block.

[0015] As a preferred solution of the cold finishing die of the end face spline of the present invention, there are a plurality of positioning grooves, and the plurality of positioning grooves are evenly arranged on the side of the finishing die core.

[0016] As a preferred solution of the cold finishing die of the end face spline of the present invention, the upper end face diameter of the finishing die core is smaller than the lower end face diameter, and the transition surface between the upper and lower parts of the finishing die core is a smooth curved surface.

[0017] As a preferred solution of the cold finishing die of the end face spline of the present invention, the cold finishing die also includes a finishing ejector, which is slidably arranged in the die sleeve, and the axis of the finishing ejector coincides with the axis of the finishing die core.

[0018] The beneficial effects of the present invention are:

[0019] The cold finishing die provided by the present invention ensures the runout requirements of the end face spline and the product shape by floating the concave die, saving processing costs for subsequent machining. The end face spline is first finished, and then the end face spline is used as the positioning reference for machining, which improves the precision requirements of the end face spline and the shape and inner cavity size. In general, the floating finishing die structure saves processing costs, shortens the processing technology, and improves product precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0021] Figure 1 A schematic diagram of a cold finishing die provided by the present invention;

[0022] Figure 2 A front view of a finishing pressure block in a cold finishing die provided by the present invention;

[0023] Figure 3 A schematic diagram of the structure of a finishing mold core in a cold finishing mold provided by the present invention;

[0024] Figure 4 A front view of a finishing mold core in a cold finishing mold provided by the present invention;

[0025] Among them: 1. Die sleeve; 2. Finishing pressure block; 3. Through hole; 4. Mounting hole; 5. Finishing die core; 6. Spring; 7. Finishing die; 8. Finishing punch; 9. Positioning groove; 10. Finishing ejector; 11. Product. DETAILED DESCRIPTION

[0026] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific implementation modes and in combination with the accompanying drawings.

[0027] See also Figure 1 The cold finishing die includes a die sleeve 1, a finishing pressure block 2, a finishing die core 5, a spring 6, a finishing die 7, a finishing punch 8 and a finishing stripper 10. By placing the back extrusion material into the die cavity of the die and extruding it, the end face spline can be forged.

[0028] For details, see Figure 1 , the finishing pressure block 2 is fixedly arranged in the die sleeve 1. Figure 2 The finishing pressure block 2 is roughly in the shape of a hollow cylinder. A through hole 3 for placing a finishing mold core 5 is provided in the middle of the finishing pressure block 2. The through hole 3 penetrates the finishing pressure block 2 along the thickness direction of the finishing pressure block 2. Several mounting holes 4 are also provided on the finishing pressure block 2. Figure 2 The plurality of mounting holes 4 are evenly arranged on a circle with the center of the through hole 3 as the center, and the distance between the axis of any mounting hole 4 and the axis of the through hole 3 is equal.

[0029] The finishing mold core 5 is arranged in the through hole 3 in the middle of the finishing pressure block 2. Figure 3 The upper end of the finishing die core 5 is provided with an end spline that matches the end spline product. When the workpiece is placed on the finishing die core 5, the end spline can be formed on the lower end face of the product by extruding the finishing punch 8.

[0030] Better, see Figure 4 , three positioning grooves 9 are provided on the side of the finishing mold core 5. Correspondingly, positioning protrusions matching the positioning grooves 9 are provided on the inner side of the finishing pressure block 2, that is, on the side wall of the through hole 3 in the middle of the finishing pressure block 2. The cooperation between the positioning grooves 9 and the positioning protrusions can ensure that the finishing mold core 5 will not rotate relative to the finishing pressure block 2 when it is set in the middle of the finishing pressure block 2, thereby improving the position stability of the finishing mold core 5 in the finishing pressure block 2.

[0031] In this embodiment, the diameter of the upper end surface of the finishing mold core 5 is smaller than the diameter of the lower end surface, and the transition surface between the upper part and the lower part of the finishing mold core 5 is a smooth curved surface, see Figure 1 .

[0032] The spring 6 is arranged in the mounting hole 4 of the finishing pressure block 2. A spring 6 is arranged in each mounting hole 4. Figure 1 , the axis of the spring 6 extends in the vertical direction, that is, the spring 6 expands and contracts in the vertical direction.

[0033] It should be noted that, in the state of natural extension, the upper end of the spring 6 is higher than the upper end surface of the finishing pressure block 2. In this way, the spring 6 can support the finishing die 7 thereon. At the same time, in the state of natural extension, the lengths of all springs 6 are equal, that is, the upper ends of all springs 6 are located in the same horizontal plane, so that all springs 6 can support the lower end surface of the finishing die 7.

[0034] The finishing die 7 is located in the die sleeve 1 and is placed on the upper end of the spring 6. The film cavity inside the finishing die 7 is adapted to the outer shape of the product.

[0035] The finishing punch 8 is located directly above the finishing die 7. The shape of the finishing punch 8 is adapted to the internal shape of the product. After the finishing punch 8 moves downward, it can extend into the film cavity of the finishing die 7 to extrude the back extrusion material.

[0036] The above-mentioned cold finishing mold as a whole adopts the finishing die 7 to float up and down, and the finishing die 7 is supported by the spring 6 to ensure that the end face spline and the outer circle runout of the product are guaranteed to be within 0.6. In this way, the product margin can be the same as the transmission outer star wheel, which will not increase the turning cost and reduce the overall process cost. By floating the die, the runout requirements of the end face spline and the product shape are guaranteed, saving processing costs for subsequent machining. The end face spline is first finished, and then the end face spline is used as the positioning reference for machining, which improves the accuracy requirements of the end face spline and the shape and inner cavity size. In general, the use of a floating finishing mold structure saves processing costs, shortens the processing technology, and improves product precision.

[0037] In addition, in order to ensure smooth discharge, the cold finishing mold further includes a finishing ejector 10. Figure 4 The finishing stripper 10 is slidably mounted in the die sleeve 1, and the axis of the finishing stripper 10 coincides with the axis of the finishing die core 5. After the product is formed, the product can be ejected from the finishing die 7 by moving the finishing stripper 10 upward.

[0038] In addition to the above embodiments, the present invention may also have other implementation modes; any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A cold finishing die for end face splines, characterized in that: include: Mold sleeve (1); A finishing pressure block (2) is arranged in the mold sleeve (1), a through hole (3) for placing a finishing mold core (5) is opened in the middle of the finishing pressure block (2), and a plurality of mounting holes (4) are opened on the finishing pressure block (2); A finishing mold core (5) is arranged in the through hole (3); A spring (6) is arranged in the mounting hole (4), and the axis of the spring (6) extends in the vertical direction; A finishing die (7) is located inside the die sleeve (1) and is placed on the upper end of the spring (6); And, a finishing punch (8) is located above the finishing die (7).

2. The cold finishing die for the end face spline according to claim 1, characterized in that: A plurality of the mounting holes (4) are evenly arranged on a circumference with the center of the through hole (3) as the center, and the distance between the axis of any mounting hole (4) and the axis of the through hole (3) is equal.

3. The cold finishing die for end face splines according to claim 1, characterized in that: In a naturally extended state, the upper end of the spring (6) is higher than the upper end surface of the finishing pressure block (2).

4. The cold finishing die for end face splines according to claim 1, characterized in that: A positioning groove (9) is provided on the side of the finishing mold core (5), and a positioning protrusion matched with the positioning groove (9) is provided on the inner side of the finishing pressure block (2).

5. The cold finishing die for end face splines according to claim 4, characterized in that: A plurality of the positioning grooves (9) are provided, and the plurality of the positioning grooves (9) are evenly arranged on the side surface of the finishing mold core (5).

6. The cold finishing die for end face splines according to claim 4, characterized in that: The diameter of the upper end surface of the finishing mold core (5) is smaller than the diameter of the lower end surface, and the transition surface between the upper part and the lower part of the finishing mold core (5) is a smooth curved surface.

7. The cold finishing die for end face splines according to claim 1, characterized in that: The cold finishing mold further comprises a finishing ejector (10), wherein the finishing ejector (10) is slidably arranged in the mold sleeve (1), and the axis of the finishing ejector (10) coincides with the axis of the finishing mold core (5).

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