Hollow spline shaft fork blank forging die and forging process

Abstract

The present application relates to a kind of hollow spline shaft fork blank forging die and forging process, and the forging die includes lower die, upper die and driving device;Lower die top is provided with lower die cavity and several lower slide;Lower slide is slidably provided with die stem in, and one end of lower slide is communicated lower die cavity;Upper die is set in the upper of lower die, and the bottom of upper die is provided with upper die cavity and with lower slide one-to-one corresponding upper slide, upper die cavity and lower die cavity are matched, and upper slide and lower slide are matched driving device is used to drive upper die to move downwards, and drive die stem to move to lower die cavity;Several die stems are set in the present application, and the complex spline shaft fork can be completed once heating without flash forging, preferably, die stem corresponds the deep hole of shaft fork shaft portion end portion and the two through holes of shaft fork fork portion respectively, the shaft fork blank with shaft portion and fork portion can be completed, and the deep hole is provided in shaft portion, and the through hole is provided on fork portion, the blank shape is closer to the shape of finished product, and the weight of feeding is light, the forming quality is good, and the forming precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of forging of spline shaft fork blanks, and particularly relates to a hollow spline shaft fork blank forging die and a forging process. BACKGROUND

[0002] At present, spline shaft forks used on automobile transmission shafts are mainly solid integral type and friction welded (the shaft fork head and the shaft tube are friction welded), and are basically formed by using a traditional forging process. The traditional forging process route is: blanking, heating, blank making, heating, pre-forging, final forging, trimming, quenching and tempering treatment, and shot blasting. The traditional forging process needs 2 times of heating and 9 processes, has high production cost, low production efficiency, and produces a large amount of trimming waste and oxidation loss. Although the traditional forging process can meet the demand, the traditional process needs two times of heating, has many processes, produces much waste from the flash, and has high energy consumption and cost, and the blank weight is heavy. SUMMARY

[0003] Based on the above description, the present application provides a hollow spline shaft fork blank forging die and a forging process. By arranging a plurality of die rods, the no-flash forging of the complex spline shaft fork can be completed by one time of heating. Preferably, the die rods correspond to the deep hole at the end of the shaft part of the shaft fork and the two through holes of the fork part, respectively, so that the shaft fork blank with the shaft part and the fork part can be completed, the end of the shaft part is provided with the deep hole, the fork part is provided with the through hole, the blank shape is closer to the finished product shape, the feeding weight is light, the forming quality is good, and the forming precision is high.

[0004] The technical scheme for solving the above technical problem is as follows: a hollow spline shaft fork blank forging die, comprising a lower die, an upper die and a driving device;

[0005] The lower die is provided with a lower die cavity and a plurality of lower slides at the top; the die rods are slidably arranged in the lower slides; and one end of the lower slide is communicated with the lower die cavity;

[0006] The upper die is arranged above the lower die, the bottom of the upper die is provided with an upper die cavity and an upper slide corresponding to the lower slide one by one, the upper die cavity is used to form a complete closed die cavity together with the lower die cavity, and the upper slide is used to form a complete slide matched with the die rod together with the lower slide;

[0007] The driving device is used to drive the upper die to move downward and drive the die rod to move toward the lower die cavity.

[0008] On the basis of the above technical scheme, the present application can also be improved as follows.

[0009] Further, the top of the lower die cavity is provided with three lower slides and the die rods, and the die rods correspond to the deep hole at the end of the shaft part of the shaft fork and the two through holes of the fork part, respectively.

[0010] Further, the driving device comprises a cylinder body arranged above the upper die;

[0011] An outer piston rod is arranged in the cylinder body, the top of the outer piston rod is open, and an outer piston plate is arranged outside the top of the outer piston rod, the outer piston plate is in slidable sealing fit with the inner side wall of the cylinder body; a push plate is arranged at the bottom of the outer piston rod, the bottom of the push plate is provided with a push rod corresponding to the die rod, the bottom of the push rod is slidable through the upper die, and the push rod is used for pushing the corresponding die rod;

[0012] An inner piston rod is arranged in the outer piston rod in parallel, the top of the inner piston rod is provided with an inner piston plate, the inner piston plate is in slidable sealing fit with the inner side wall of the outer piston rod; the bottom of the inner piston rod is slidable through the push plate and connected with the upper die;

[0013] A clamping groove is arranged on the outer piston rod, a trigger block movable in the radial direction is arranged in the clamping groove, and a clamping block matched with the clamping groove is elastically arranged at the bottom of the cylinder body; when the upper die and the lower die are closed, the inner piston plate presses the clamping block out of the clamping groove through the trigger block.

[0014] Further, the bottom of the outer piston plate is connected with the cylinder body through a first elastic member, and the first elastic member is used for pushing the outer piston plate upwards.

[0015] Further, the die rod is provided with a first inclined surface at the end away from the lower die cavity, and the top of the first inclined surface is inclined to the side close to the lower die cavity; the bottom of the push rod is provided with a second inclined surface matched with the first inclined surface.

[0016] Further, the bottom of the end of the lower slide away from the lower die cavity is provided with a buffer groove matched with the push rod.

[0017] Further, the bottom of the inner piston plate is connected with the push plate through a second elastic member, and the second elastic member is used for pushing the inner piston plate upwards.

[0018] Further, the die rod is connected with the lower die through a third elastic member, and the third elastic member is used for pushing the die rod away from the lower die cavity.

[0019] The application further provides a hollow spline shaft fork blank forging process, which comprises the following steps:

[0020] (1) The raw material steel bar is sawed into a rod material of a specified length by a high-speed circular sawing machine according to the required length and weight;

[0021] (2) the bar material of the specified length is put into the middle frequency heating furnace for heating;

[0022] (3) the bar material is taken out from the heating furnace to remove the oxide skin;

[0023] (4) the bar material without the oxide skin is put into the closed die cavity of the hydraulic forging machine, the hydraulic machine is started, and the punch extrudes the bar material into the die cavity to realize the blanking by die forging and extrusion at the same time, and the shaft-fork blank with the shaft part and the fork part at the same time is generated, and the end part of the shaft part is provided with a deep hole, and the fork part is provided with a through hole;

[0024] (5) the blank is quenched and tempered and is shot blasted.

[0025] Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

[0026] 1. The complex spline shaft fork without flash can be forged by one-time heating through the arrangement of the plurality of die rods, preferably, the die rods correspond to the deep hole at the end part of the shaft part of the shaft-fork and the two through holes of the fork part, the shaft-fork blank with the shaft part and the fork part at the same time is completed, the end part of the shaft part is provided with a deep hole, the fork part is provided with a through hole, the blank shape is closer to the finished product shape, the feeding weight is light, the forming quality is good, and the forming precision is high.

[0027] 2. The upper and lower molds are first completed in steps through one cylinder body by arranging the outer piston rod and the inner piston rod in the cylinder body of the driving device, the die rod is then made to extend into the die cavity, the control process of the driving device is simplified, and the control is more convenient.

[0028] 3. The forging process only needs one-time heating, and the blank does not need to be edge cut, the production efficiency of the blank is improved, and the production cost of the blank is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure schematic view of the blank completed by the embodiment of the application;

[0030] Figure 2 The structure schematic view of the hollow spline shaft fork blank forging die and the forging process provided by the embodiment of the application;

[0031] Figure 3 The top view schematic view of the lower mold in the embodiment of the application;

[0032] Figure 4 The structure schematic view of the driving device before work in the embodiment of the application;

[0033] Figure 5 The structure schematic view of the driving device after the upper and lower molds are closed in the embodiment of the application;

[0034] Figure 6Fig. 2 is a schematic view of the structure of the driving device after the mold rod of the embodiment of the present application extends into the mold cavity;

[0035] In the drawings, the components represented by the reference numerals are listed as follows:

[0036] 1, lower mold; 11, lower mold cavity; 12, lower slide; 13, mold rod, 14, third elastic member; 15, buffer groove; 2, upper mold; 21, upper mold cavity; 22, upper slide; 3, cylinder body; 31, clamping block; 4, outer piston rod; 41, outer piston plate; 42, first elastic member; 43, push plate; 44, push rod; 45, clamping groove; 46, trigger block; 5, inner piston rod; 51, inner piston plate; 52, second elastic member; 6, blank; 61, shaft portion; 62, deep hole; 63, fork portion; 64, through hole. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0039] As used herein, the singular forms "a", "an" and "the" also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprise / comprising" or "have / having" specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0040] Embodiment one

[0041] A hollow spline shaft fork blank 6 forging die, as shown in Figure 2 includes a lower mold 1, an upper mold 2 and a driving device.

[0042] The lower mold 1 is provided with a lower mold cavity 11 and a plurality of lower slides 12 at the top. The mold rod 13 is slidably arranged in the lower slide 12, and one end of the lower slide 12 is communicated with the lower mold cavity 11.

[0043] The upper die 2 is arranged above the lower die 1, and the bottom of the upper die 2 is provided with an upper die cavity 21 and upper slides 22 corresponding to the lower slides 12 one by one, the upper die cavity 21 is used to form a complete closed die cavity together with the lower die cavity 11, and the upper slides 22 are used to form complete slides matched with the die rods 13 together with the lower slides 12.

[0044] The driving device is used to drive the upper die 2 to move downward and drive the die rods 13 to move toward the lower die cavity 11.

[0045] The embodiment can complete the flashless forging of the complex spline shaft fork by heating once.

[0046] In the embodiment, as shown in Figure 3 , the top of the lower die cavity 11 is provided with three lower slides 12 and the die rods 13, and the die rods 13 correspond to the deep hole 62 at the end of the shaft part 61 and the two through holes 64 of the fork part 63 of the shaft fork respectively.

[0047] Therefore, the forging die of the embodiment can complete the blank 6 as shown in Figure 1 , the blank 6 has the shaft part 61 and the fork part 63 at the same time, the end of the shaft part 61 is provided with the deep hole 62, and the fork part 63 is provided with the through hole 64, the shape of the blank 6 is closer to the shape of the finished product, the feeding weight is light, the forming quality is good, and the forming precision is high.

[0048] Preferably, as shown in Figures 4 to 6 , the driving device includes a cylinder body 3, and the cylinder body 3 is arranged above the upper die 2.

[0049] The cylinder body 3 is provided with an outer piston rod 4, the top of the outer piston rod 4 is open, and the outer side of the top of the outer piston rod 4 is provided with an outer piston plate 41, the outer piston plate 41 is in slidable sealing fit with the inner side wall of the cylinder body 3, and the bottom of the outer piston plate 41 is connected to the cylinder body 3 through a first elastic member 42, and the first elastic member 42 is used to push the outer piston plate 41 upward.

[0050] The bottom of the outer piston rod 4 is provided with a push plate 43, the bottom of the push plate 43 is provided with push rods 44 corresponding to the die rods 13 one by one, the bottom of the push rod 44 is slidably arranged through the upper die 2, and the push rod 44 is used to push the corresponding die rod 13. The end of the die rod 13 away from the lower die cavity 11 is provided with a first inclined surface, and the top of the first inclined surface is inclined to the side close to the lower die cavity 11. The bottom of the push rod 44 is provided with a second inclined surface matched with the first inclined surface. The bottom of the end of the lower slide 12 away from the lower die cavity 11 is provided with a buffer groove 15 matched with the push rod 44. The die rod 13 is connected to the lower die 1 through a third elastic member 14, and the third elastic member 14 is used to push the die rod 13 away from the lower die cavity 11.

[0051] An inner piston rod 5 is arranged in parallel inside the outer piston rod 4, and a top of the inner piston rod 5 is provided with an inner piston plate 51 which is in slidable sealing cooperation with an inner side wall of the outer piston rod 4. A bottom of the inner piston rod 5 is slidable through the push plate 43 and connected with the upper die 2. A bottom of the inner piston plate 51 is connected with the push plate 43 through a second elastic member 52 which is used to push the inner piston plate 51 upward.

[0052] When the pressure inside the cylinder 3 is increased, the outer piston plate 41 is moved downward due to the clamping block 31 clamped into the clamping groove 45, and the gradually increased pressure first pushes the inner piston plate 51 to move downward, so that the upper and lower dies 1 are closed.

[0053] After the upper and lower dies 1 are closed, the inner piston plate 51 presses the clamping block 31 out of the clamping groove 45 through the trigger block 46, and the outer piston plate 41 starts to move downward. At this time, the push rod 44 pushes the die rod 13 to extend into the die cavity, until the push rod 44 passes through the die rod 13 and enters the buffer groove 15. At this time, the push rod 44 prevents the die rod 13 from resetting, so that the die rod 13 remains in the die cavity.

[0054] After the forging is completed, the cylinder 3 is depressurized, and the outer piston plate 41, the inner piston plate 51 and the die rod 13 are reset under the action of the first elastic member 42, the second elastic member 52 and the third elastic member 14 respectively.

[0055] In the embodiment, the outer piston rod 4 and the inner piston rod 5 are arranged in the driving device cylinder 3, so that the upper and lower dies 1 are closed first and then the die rod 13 extends into the die cavity through one cylinder 3, which simplifies the control process of the driving device and is more convenient to control.

[0056] Embodiment two

[0057] A hollow spline shaft fork blank forging process comprises the following steps:

[0058] (1) The raw material steel bar is sawed into a bar material of a specified length according to the required length and weight by using a high-speed circular sawing machine;

[0059] (2) The bar material of the specified length is placed into a medium-frequency heating furnace for heating;

[0060] (3) The bar material is clamped out of the heating furnace to remove the oxide skin;

[0061] (4) The bar material with the removed oxide skin is placed into a closed die cavity of a hydraulic forging machine, the hydraulic machine is started, and a punch presses the bar material into the die cavity to realize die forging and extrusion at the same time to manufacture a blank, and a shaft fork blank with a shaft part and a fork part is generated, and the end of the shaft part is provided with a deep hole, and the fork part is provided with a through hole;

[0062] (5) The blank is subjected to a quenching and tempering treatment and shot blasting.

[0063] The forging process of the embodiment only needs one heating, and does not need to perform edge cutting treatment on the blank, thereby improving the production efficiency of the blank and reducing the production cost of the blank.

[0064] The above merely provides the preferred embodiments of the application, and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A hollow spline shaft yoke blank forging die characterized by, The hollow spline shaft fork blank forging die comprises a lower die, an upper die and a driving device. The lower die is provided with a lower die cavity and a plurality of lower slides on the top. The upper die is arranged above the lower die and is provided with an upper die cavity and upper slides corresponding to the lower slides on the bottom. The driving device is used to drive the upper die to move downward and drive the die rods to move toward the lower die cavity. The lower die cavity is provided with three lower slides and the die rods on the top. The driving device comprises a cylinder arranged above the upper die. The outer piston rod is provided with an outer piston plate on the top. The outer piston rod is provided with a push plate on the bottom. The inner piston rod is provided with an inner piston plate on the top.

2. The hollow spline shaft fork blank forging die according to claim 1, wherein The outer piston plate is provided with a clamping groove.

3. The hollow spline shaft fork blank forging die according to claim 1, wherein The clamping groove is provided with a trigger block movable in the radial direction.

4. The hollow spline shaft fork blank forging die according to claim 1, wherein The upper die and the lower die are combined.

5. The hollow spline shaft fork blank forging die according to claim 1, wherein The outer piston plate is connected to the cylinder through a first elastic member.

6. The hollow spline shaft fork blank forging die according to claim 1, wherein The die rod is provided with a first inclined surface.

7. A hollow spline shaft fork blank forging process characterized by, The lower slide is provided with a buffer groove. The inner piston plate is connected to the push plate through a second elastic member. The die rod is connected to the lower die through a third elastic member. The hollow spline shaft fork blank forging die comprises the following steps: (1) The raw material steel bar is cut into a rod material of a specified length by a high-speed sawing machine according to the required length and weight; (2) The rod material of the specified length is placed into a medium-frequency heating furnace for heating; (3) The rod material is taken out from the heating furnace to remove the oxide skin; (4) The bar without the scaling is put into the closed die cavity of the hydraulic forging machine, the hydraulic machine is started, and the punch extrudes the bar into the die cavity to realize the blanking by die forging and extrusion at the same time, and the shaft-fork blank with the shaft part and the fork part is generated, and the end of the shaft part is provided with a deep hole, and the fork part is provided with a through hole; (5) The blank is subjected to the quenching and tempering treatment and the shot blasting.

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