CN217990810U

CN217990810U - Hollow spline shaft finish forging die

Info

Publication number: CN217990810U
Application number: CN202221556657.2U
Authority: CN
Inventors: 郭艳珺; 刘建华; 李广宇; 陈喜乐; 胡卫华; 葛利芳; 李洁; 卢文峰; 丁圣杰; 宋航; 田鹏
Original assignee: Xuchang Yuandong Drive Shaft Co Ltd; Xuchang Zhongxing Forging Co Ltd
Current assignee: Xuchang Yuandong Drive Shaft Co Ltd; Xuchang Zhongxing Forging Co Ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-12-09
Anticipated expiration: 2032-06-21

Abstract

A hollow spline shaft finish forging die comprises an upper die frame, a lower die frame, an upper female die, a lower female die and a male die body, wherein the male die body comprises a male die rod and a male die pressure head which are coaxially arranged; the excircle of the first conical section is symmetrically provided with two positioning keys about the central line, and the left ends of the two positioning keys are fixedly connected with the right end face of the annular pressing plate. The utility model discloses a to the design that hollow spline shaft finish forging goes on, have following advantage: the structure is simple, the installation and the disassembly are convenient, the spindle head is further upset after the finish forging, any part of the inner nest is ensured not to be lack of materials, the demoulding is convenient, the forging workload of the finish forging process is greatly reduced, the forging efficiency is improved, the abrasion of a finish forging die is reduced, and the service life is prolonged.

Description

Hollow spline shaft finish forging die

Technical Field

The utility model belongs to the technical field of the automotive industry, concretely relates to hollow spline shaft finish forging mould.

Background

The traditional spline shaft forging is of a long-rod solid revolving body structure, solid bars are adopted for upsetting and forming on a horizontal forging machine during forging, the spline shaft forging adopts the solid bars as blanks, and the shaft body of the produced forging is of a solid structure. The following problems are caused: (1) the forging piece is heavy, the raw material consumption is high, and the heating energy consumption is high; (2) the labor intensity of workers is high during operation, and the production efficiency is low; (3) the heavy weight of the spline shaft forge piece can cause the weight increase of the transmission shaft assembly, the load of a transmission system is additionally increased, and the trend of light weight design of automobile parts is not met; (4) the forging process of the forgings is high in cost.

The blank that hollow spline shaft adopted is pipe material (steel pipe), need carry out the preforging when forging earlier, carry out the finish forging after the preforging, the inner nest of the protruding die body main forming spindle nose that the finish forging adopted, because the inner nest after the preforging has tentatively enlarged, the axis body centre bore of hollow spline shaft is penetrating with the inner nest simultaneously, two centrosymmetric location keyways still need to forge to the inner nest inner wall, when designing the location keyway, through the metal flow direction and the shaping effect of forging shaping numerical simulation analysis location keyway, discover location keyway size and structural design in time improper, the location keyway can appear scarcely expecting and folding. Therefore, it is necessary to improve the structure of the existing hollow spline shaft finish forging die.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the weak point among the prior art, provide a hollow spline shaft finish forging mould that can improve interior nest shaping efficiency and quality.

In order to solve the technical problem, the utility model adopts the following technical scheme: a final forging die for a hollow spline shaft comprises an upper die frame, a lower die frame, an upper female die, a lower female die and a male die body, wherein the upper female die is fixedly installed at the bottom of the upper die frame, the lower female die is fixedly installed at the top of the lower die frame, a final forging die cavity is arranged between the bottom of the upper female die and the top of the lower female die, the final forging die cavity is composed of a shaft head cavity and a shaft body cavity which are coaxially arranged, the shaft head cavity is positioned on the left side of the shaft body cavity, the central line of the male die body is superposed with the central line of the final forging die cavity, the male die body coaxially extends into the final forging die cavity from left to right, the male die body comprises a male die rod and a male die pressing head which are coaxially arranged, a threaded hole is formed in the center of the right end of the male die rod, the male die pressing head sequentially comprises an external thread connecting section, an annular pressing plate, a first conical section, a second conical section and a guide section from left end face of the external thread connecting section to the right, the left end face of the male die pressing plate is pressed with the right end face of the male die rod; the first conical section, the second conical section and the guide section are cone structures with the left thick and the right thin, the excircle of the first conical section is symmetrically provided with two positioning keys about the central line, and the left ends of the two positioning keys are fixedly connected with the right end face of the annular pressing plate.

The included angle between the outer side of the positioning key and the center line of the convex die body along the axial direction of the convex die body is 5 degrees, and the included angle between the right side of the positioning key and the center line of the convex die body along the radial direction of the convex die body is 75 degrees.

The included angle between the generatrix of the first conical section and the central line is 2 degrees, the included angle between the generatrix of the second conical section and the central line is 30 degrees, and the included angle between the generatrix of the guide section and the central line is 1 degree.

The excircle of the right end of the guide section is provided with an arc chamfer, and the center of the right end face of the guide section is provided with a straight or cross-shaped groove for rotating a screwdriver.

And ejector rod holes are formed in the inner parts of the lower die frame and the lower concave die along the vertical direction, and the center line of each ejector rod hole penetrates through the center of gravity of the finish forging die cavity.

Adopt above-mentioned technical scheme, the utility model discloses a raw and other materials change the pipe material into by original solid bar, and the centre bore at axis body center forms naturally to alleviate forging weight. The inner nest of the shaft head of the workpiece is preliminarily formed after the pre-forging, so that the forging workload is reduced during the finish forging, and the forging efficiency is improved.

The utility model discloses a preforging working process does: and (3) placing the pre-forged workpiece into the lower female die of the finish forging cavity, starting the horizontal forging machine, and enabling the upper die frame and the upper female die to downwards move to be in contact with the lower female die. Then the die body moves rightwards to perform pre-forging operation on the pipe material, a guide section of a male die pressure head firstly enters a central hole of a shaft body of the pre-forging piece, a second conical section and a first conical section perform finish forging on an inner socket of the pre-forged shaft head, an annular pressure plate extrudes the left end of the pre-forging piece rightwards along with the increase of the rightward feeding amount of the die body, the whole pre-forging piece is upset in the axial direction while the inner socket and two positioning key grooves are formed, and the wall thickness of the shaft head of the pre-forging piece is further increased; after the finish forging process is finished, the die body is withdrawn leftwards, the upper die frame and the upper female die move upwards, the upper half part of the finish forging piece is separated from the upper female die, then a mandril arranged in a mandril hole is started (the lower end of the mandril is driven by a cylinder), the mandril jacks up the finish forging piece and separates the lower female die, a worker clamps a shaft head of the finish forging piece by using a long handle, and the finish forging piece is placed at a finish forging station for finish forging operation.

The utility model discloses a through threaded connection, easy to assemble and dismantlement between terrace die pressure head and the terrace die pole to change the terrace die pressure head of different shapes and size, during installation and dismantlement, can use the screwdriver to block a word or cross type groove rotating terrace die pressure head of right-hand member.

After the guide section of the punch press head extends into the central hole of the shaft body, the annular pressing plate further upsets the shaft head, and the guide section has the following effects: the shaft body part adjacent to the shaft head is limited to move along the radial direction, and the aperture of the central hole is ensured not to be reduced.

The shapes and related dimensional parameters of the positioning key, the first conical section, the second conical section and the guide section are designed based on the structure and the size of a final forging piece, so that the die is easy to demold, and the shaft head, particularly the positioning key groove, is ensured not to be lack of materials and folded, so that the final forging quality is improved.

The design that the inner wall of the inner socket is provided with the positioning key groove is a material removing design, so that the weight of the forging can be reduced on the premise of not reducing the strength of the shaft head, and the cost of raw materials is reduced. The function of positioning the key slot is as follows: the integral key shaft forging is the solid of revolution, and the power of 90 directions of perpendicular with integral key shaft forging the central axis needs when processing the forging excircle, makes the forging rotatory get up and process, at this moment need design dedicated driver plate and stir the forging and rotate, and the driver plate realizes the rotation of forging through stirring two symmetrical location keyway.

The utility model provides an between last die carrier and the last die, all be connected through bolt assembly between lower die carrier and the lower die.

To sum up, the utility model discloses a to the design that hollow spline shaft finish forge goes on, have following advantage: the structure is simple, the installation and the disassembly are convenient, the spindle head is further upset after the finish forging, any part of the inner nest is ensured not to be lack of materials, the demoulding is convenient, the forging workload of the finish forging process is greatly reduced, the forging efficiency is improved, the abrasion of a finish forging die is reduced, and the service life is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged view of the punch ram of FIG. 1;

FIG. 3 is a schematic structural view of a finish forged workpiece according to the present invention;

fig. 4 is a top view of fig. 3.

Detailed Description

As shown in fig. 1-4, the utility model discloses a hollow spline shaft finish forging die, including upper die carrier 1, lower die carrier 2, upper die 3, lower die 4 and the punch block, upper die 3 is fixed to be installed in upper die carrier 1 bottom, lower die 4 is fixed to be installed at lower die carrier 2 top, be equipped with the finish forging die cavity between upper die 3 bottom and lower die 4 top, the finish forging die cavity comprises the spindle nose chamber 6 and the spindle body chamber 7 of coaxial setting, spindle nose chamber 6 is located the left side of spindle body chamber 7, the punch block central line coincides with the finish forging die cavity central line, the punch block coaxially stretches into the finish forging die cavity from left to right, the punch block includes the punch rod 8 and the punch head 9 that set up coaxially, the right-hand member center of punch rod 8 is seted up the screw hole, the punch head 9 is external screw thread connection section 10 from left to right side in proper order, annular clamp plate 11, first cone section 12, second cone section 13 and direction section 14, external screw connection section 10 stretches into and threaded connection in the screwed hole, the left end face of connection section 10 left end face and the annular hole bottom press-face of punch rod, the right end face of annular clamp plate 11 are also with the punch rod 8 external screw connection at the right end face simultaneously; the first conical section 12, the second conical section 13 and the guide section 14 are all in a cone structure with the left thick and the right thin, the excircle of the first conical section 12 is symmetrically provided with two positioning keys 15 about the central line, and the left ends of the two positioning keys 15 are fixedly connected with the right end face of the annular pressing plate 11.

The included angle of the outer side of the positioning key 15 and the center line of the convex die body along the axial direction of the convex die body is 5 degrees, and the included angle of the right side of the positioning key 15 and the center line of the convex die body along the radial direction of the convex die body is 75 degrees.

The included angle between the generatrix of the first conical section 12 and the central line is 2 degrees, the included angle between the generatrix of the second conical section 13 and the central line is 30 degrees, and the included angle between the generatrix of the guide section 14 and the central line is 1 degree.

An arc chamfer is arranged on the excircle of the right end of the guide section 14, and a straight or cross-shaped groove 16 for the screwdriver to rotate is arranged in the center of the right end face of the guide section 14.

And ejector rod holes 17 are formed in the lower die frame 2 and the lower die 4 along the vertical direction, and the center line of the ejector rod hole 17 penetrates through the center of gravity of the finish forging cavity.

The utility model discloses the equal circular arc of transition joint portion or the curved surface transition of well upper and lower die 3, lower die 4 and die body surface in different shape structures.

The utility model discloses a raw and other materials are changed into the pipe material by original solid bar, and the 19 natural formation of centre bore at 18 centers of axis body to alleviate forging weight. The inner socket 21 of the spindle head 20 of the workpiece after pre-forging is formed preliminarily, so that the forging workload is reduced during finish forging, and the forging efficiency is improved.

The utility model discloses a preforging working process does: and (3) placing the pre-forged workpiece into a lower female die 4 of a finish forging cavity, starting a horizontal forging machine, and moving an upper die frame 1 and an upper female die 3 downwards to be in contact with the lower female die 4. Then the die body moves rightwards to perform pre-forging operation on the pipe material, a guide section 14 of a punch press head 9 firstly enters a central hole 19 of a shaft body 18 of the pre-forged piece, a second conical section 13 and a first conical section 12 perform finish forging on an inner socket 21 of a spindle head 20 after the pre-forging, an annular pressing plate 11 extrudes the left end of the pre-forged piece rightwards along with the increase of the rightward feeding amount of the die body, the upsetting of the whole pre-forged piece is realized in the axial direction while the inner socket 21 and two positioning key grooves 5 are formed, and the wall thickness of the spindle head 20 of the pre-forged piece is further increased; after the finish forging process is finished, the die body is withdrawn leftwards, the upper die frame 1 and the upper die 3 move upwards, the upper half part of the finish forging piece is separated from the upper die 3, then an ejector rod arranged in an ejector rod hole 17 is started (the lower end of the ejector rod is driven by a cylinder), the ejector rod jacks the finish forging piece and separates the finish forging piece from the lower die 4, a worker clamps a shaft head 20 of the finish forging piece by using a long handle, and the finish forging piece is placed at a finish forging station for finish forging operation.

The utility model discloses a through threaded connection, easy to assemble and dismantlement between terrace die pressure head 9 and the terrace die pole 8 to change the terrace die pressure head 9 of different shapes and size, during installation and dismantlement, can use the screwdriver to block a word or 16 rotating terrace die pressure heads 9 in cross type groove of right-hand member.

After the guide section 14 of the punch press head 9 extends into the central hole 19 of the shaft body 18, the annular pressure plate 11 further upset the shaft head 20, and the guide section 14 has the following functions: the portion of the shank 18 defined adjacent the stub shaft 20 moves in a radial direction to ensure that the bore diameter of the central bore 19 does not decrease.

The shapes and related dimensional parameters of the positioning key 15, the first conical section 12, the second conical section 13 and the guide section 14 are designed based on the structure and the size of a final forging piece, so that the demoulding is easy, and the shaft head 20, particularly the positioning key groove 5, is ensured not to be lack of materials and folded, so that the final forging quality is improved.

The design that the positioning key groove 5 is arranged on the inner wall of the inner cavity 21 is a material removing design, so that the weight of a forging piece can be reduced and the cost of raw materials can be reduced on the premise of not reducing the strength of the shaft head 20. The function of the positioning key slot 5 is: the integral key shaft forging is the solid of revolution, and the power of 90 directions of the central axis of the integral key shaft forging is required to be perpendicular to when the excircle of the forging is processed, so that the forging is rotated to be processed, and at this moment, a special drive plate is required to be designed to stir the forging to rotate, and the drive plate realizes the rotation of the forging by stirring two symmetrical positioning key grooves 5.

The utility model provides an between last die carrier 1 and the last die 3, all be connected through bolt assembly between lower die carrier 2 and the lower die 4.

The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any form, and all of the technical matters of the present invention belong to the protection scope of the present invention to any simple modification, equivalent change and modification made by the above embodiments.

Claims

1. The utility model provides a hollow spline shaft finish forging mould, including last die carrier, lower die carrier, go up the die, lower die and the die body, go up die fixed mounting in last die carrier bottom, lower die fixed mounting is at lower die carrier top, go up and be equipped with the finish forging die cavity between die bottom and the lower die top, the finish forging die cavity comprises the axle head chamber and the axis body chamber of coaxial setting, the axle head chamber is located axle body chamber left side, die body central line and the coincidence of finish forging die cavity central line, the die body is from the left hand right hand in stretching into the finish forging die cavity with the axial, its characterized in that: the male die body comprises a male die rod and a male die pressure head which are coaxially arranged, a threaded hole is formed in the center of the right end of the male die rod, the male die pressure head sequentially comprises an external thread connecting section, an annular pressure plate, a first conical section, a second conical section and a guide section from left to right, the external thread connecting section extends into the threaded hole and is in threaded connection with the threaded hole, the left end face of the external thread connecting section is in pressure connection with the bottom face of the threaded hole, and meanwhile, the left end face of the annular pressure plate is in pressure connection with the right end face of the male die rod; the first conical section, the second conical section and the guide section are of cone structures with thick left and thin right, two positioning keys are symmetrically arranged on the excircle of the first conical section relative to the central line, and the left ends of the two positioning keys are fixedly connected with the right end face of the annular pressing plate.

2. The hollow spline shaft finish forging die according to claim 1, wherein: the included angle between the outer side of the positioning key and the center line of the convex die body along the axial direction of the convex die body is 5 degrees, and the included angle between the right side of the positioning key and the center line of the convex die body along the radial direction of the convex die body is 75 degrees.

3. A hollow spline shaft finish forging die according to claim 2, wherein: the included angle between the generatrix of the first conical section and the central line is 2 degrees, the included angle between the generatrix of the second conical section and the central line is 30 degrees, and the included angle between the generatrix of the guide section and the central line is 1 degree.

4. A hollow spline shaft finish forging die according to claim 3, wherein: the excircle of the right end of the guide section is provided with an arc chamfer, and the center of the right end face of the guide section is provided with a straight or cross-shaped groove for the screwdriver to rotate.

5. A hollow spline shaft finish forging die according to any one of claims 1 to 4, wherein: and ejector rod holes are formed in the lower die frame and the inner part of the lower concave die along the vertical direction, and the center line of each ejector rod hole penetrates through the center of gravity of the finish forging die cavity.