A multifunctional composite lower die for engine crankshaft

Abstract

The utility model discloses a multifunctional composite lower mould for engine crankshaft, include: lower mould base, the split mould includes middle lower mould, trim lower mould and two side forging lower mould, two side forging lower mould are movable between split station and the combination station, be provided with the mould hole on trim lower mould and move along the vertical direction, and the middle lower mould is combined with the two side forging lower mould of combination station and forms the forging and pressing lower mould, drive assembly, drive trim lower mould and two side forging lower mould movable. This multifunctional composite lower mould for engine crankshaft is through drive assembly control trim lower mould and two side forging lower mould movable, is convenient two side forging lower mould with middle lower mould combination formation forging and pressing lower mould to cooperate with forging and pressing upper die and carries out the forging and pressing handle, is convenient through the support blank of middle lower mould and controls trim lower mould to move to the outside of middle lower mould to the blank flash support to cooperate with trim upper die and carries out the trimming handle, need not mechanical hand to snatch, avoids the deformation of extrusion knock and leads to, is favorable for promoting the quality of final product.

Description

Technical Field

[0001] This utility model relates to the field of engine crankshaft manufacturing technology, and in particular to a multifunctional composite lower mold for engine crankshafts. Background Technology

[0002] The engine crankshaft is the core of the power transmission of an internal combustion engine. It is responsible for converting the reciprocating linear motion of the piston into rotational motion, thereby driving the operation of the whole vehicle and equipment. It is widely used in automobiles, engines, pumps, etc. The crankshaft material is mostly alloy structural steel or ductile iron.

[0003] During the production process, engine crankshafts typically undergo forging, trimming, and shaping in sequence. Different processing techniques require the use of different molds, such as... Figure 1 As shown, this is a machining mold 4 for an engine crankshaft in the prior art, including a forging mold and a trimming mold. The machining mold includes a lower forging mold 42 and an upper forging mold 41 located directly above the lower forging mold 42. The trimming mold includes a lower trimming mold 44 and an upper trimming mold 44 located directly above the lower trimming mold 44. During the production process, the blank is placed on the lower forging mold 42, and the upper forging mold 41 is lowered by a hydraulic cylinder to form a forging cavity with the lower forging mold 42. After the blank is forged, the upper forging mold 41 rises and acts on the flash generated during the forging process through a push rod, making it easy for the robot to grasp. Then the blank is placed on the lower trimming mold 44, and the upper trimming mold 43 is lowered by a hydraulic cylinder to remove the flash generated during the forging process using the cutting edge of the upper trimming mold 43.

[0004] The two sets of molds mentioned above can achieve forging and trimming of the billet. However, after forging, the billet needs to be ejected by a push rod and picked up by a robotic arm. The billet usually still has a high temperature of several hundred degrees Celsius after forging, and the material is still relatively plastic. Moreover, for engine crankshafts, which are slender materials, the rigidity is relatively poor after forging, and they are prone to bending during handling. At the same time, the use of robotic arms to pick up, place, or adjust the position can easily cause the billet to be bumped, crushed, or deformed, thereby damaging the billet and affecting the quality of the final product.

[0005] Therefore, it is necessary to improve the forging die and trimming die of the engine crankshaft in the existing technology. Utility Model Content

[0006] The purpose of this invention is to overcome the defects in the existing technology and provide a multifunctional composite lower mold for engine crankshafts that reduces damage and improves the molding accuracy of the final product.

[0007] To achieve the above-mentioned technical effects, the technical solution of this utility model is: a multifunctional composite lower mold for engine crankshaft, comprising: Lower mold base; A split mold, horizontally positioned above the lower mold base, includes a middle lower mold, a trimming lower mold, and two side forging lower molds. The middle lower mold is fixed above the lower mold base. The two side forging lower molds are located on either side of the middle lower mold and can move between the split-type station and the combined station. The trimming lower mold has a mold hole extending vertically. The mold hole is a through hole. The projection of the middle lower mold on the horizontal plane is located within the projection of the mold hole on the horizontal plane. The trimming lower mold moves vertically. A gap is provided between the side forging lower molds in the split-type station for the trimming lower mold to enter. The middle lower mold and the two side forging lower molds in the combined station combine to form a forging lower mold. The forging lower mold has a forging lower cavity with the opening facing upward. A drive assembly, disposed on the lower die base, drives the trimming lower die and the two side forging lower dies to move.

[0008] Preferably, in order to form a forging lower die and facilitate forging with the forging upper die, the top surface of the middle and lower die is a positioning support surface, and the two side forging lower dies are provided with a split recess on the side adjacent to the middle and lower die. The inner wall of the split recess of the two side forging lower dies is used to combine with the positioning support surface to form the cavity wall of the forging lower cavity.

[0009] Preferably, in order to improve production efficiency, the drive assembly drives the trimming die and the two side forging dies to move simultaneously.

[0010] Preferably, in order to ensure that there is a sufficiently large gap between the two side forging dies in the split-station configuration for the trimming die to enter, the two side forging dies move in opposite directions along a distribution direction parallel to their respective directions.

[0011] Preferably, in order to simultaneously move the lower cutting die and the two side forging dies in opposite directions, the drive assembly includes a telescopic unit and a connecting rod. The telescopic unit is disposed on the lower die base, and its output end moves in the vertical direction and is fixedly connected to the middle lower die for cutting. The two sides of the lower cutting die are hinged to the two side forging dies through the connecting rod.

[0012] Preferably, in order to ensure the smooth movement of the two side forging dies, a horizontal slide rail is fixed on the die base. The slide rail extends parallel to the distribution direction of the two side forging dies. Each of the two side forging dies is provided with a slide bar, which is slidably connected to the slide rail.

[0013] Preferably, in order to improve the cutting accuracy and forging accuracy, the cutting die and the two side forging dies are provided with positioning through holes extending in the vertical direction, and the die base is fixed with guide rods extending in the vertical direction. The guide rods correspond one-to-one with the positioning through holes of the cutting die and are slidably connected.

[0014] Preferably, in order to further improve the cutting accuracy, the top end of the guide rod is located between the top and bottom surfaces of the two side forging dies. Both side forging dies are provided with clearance grooves extending along their distribution direction. One end of the clearance groove extends to the side of the corresponding side forging die adjacent to the middle and lower dies. The top end of the guide rod is located in the clearance groove of the two side forging dies in the combined working position.

[0015] Preferably, in order to achieve fixed support for the middle and lower mold, the bottom of the middle and lower mold is fixed above the lower mold base by a support rod extending in the vertical direction, and the support rod is located inside the mold hole.

[0016] Preferably, to facilitate movement and position adjustment, the bottom of the lower mold base is provided with a rolling element.

[0017] In summary, compared with the prior art, the multifunctional composite lower die for engine crankshafts of this utility model controls the movement of the trimming lower die and the two side forging lower dies through the drive component. This facilitates the combination of the two side forging lower dies with the middle and lower dies to form a forging lower die to cooperate with the forging upper die for forging processing. It also facilitates the control of the trimming lower die to move upward to the outside of the middle and lower dies to support the flash of the billet, so as to cooperate with the trimming upper die for trimming processing. There is no need for a robotic arm to grasp the billet, avoiding deformation caused by squeezing and bumping, which helps to improve the quality of the final product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a machining mold used in the prior art for producing engine crankshafts; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 yes Figure 2 A structural diagram from another perspective; Figure 4 This is a schematic diagram of the structure of the forging die of this utility model; Figure 5 This is a schematic diagram of the structure of the cutting edge lower die of this utility model; Figure 6 yes Figure 2 An explosion diagram; Figure 7 yes Figure 2 Partial structural diagram; In the diagram: 1. Lower die base; 11. Slide rail; 12. Guide rod; 13. Rolling element; 14. Horizontal bar; 15. Vertical bar; 2. Split die; 21. Middle and lower die; 211. Positioning support surface; 212. Support rod; 22. Trimming lower die; 221. Die hole; 23. Side forging lower die; 231. Split notch; 232. Slide bar; 233. Clearance groove; 24. Forging lower die; 241. Forging lower cavity; 25. Positioning through hole; 3. Drive assembly; 31. Telescopic unit; 32. Connecting rod; 4. Machining die; 41. Upper forging die; 42. Lower forging die; 43. Upper cutting die; 44. Lower cutting die. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0020] like Figures 1-7 As shown, this utility model provides a multifunctional composite lower mold for engine crankshafts, comprising: Lower mold base 1; The split mold 2 is horizontally positioned above the lower mold base 1 and includes a middle lower mold 21, a trimming lower mold 22, and two side forging lower molds 23. The middle lower mold 21 is fixed above the lower mold base 1. The two side forging lower molds 23 are located on both sides of the middle lower mold 21 and can move between the split position and the combined position. The trimming lower mold 22 is provided with a mold hole 221 extending in the vertical direction. The mold hole 221 is a through hole. The projection of the middle lower mold 21 on the horizontal plane is located within the projection of the mold hole 221 on the horizontal plane. The trimming lower mold 22 moves in the vertical direction. A gap is provided between the side forging lower molds 23 in the split position for the trimming lower mold 22 to enter. The middle lower mold 21 and the two side forging lower molds 23 in the combined position are combined to form a forging lower mold 24. The forging lower mold 24 has a forging lower cavity 241 with the cavity opening facing upward. The drive assembly 3 is mounted on the lower die base 1 and drives the movement of the trimming lower die 22 and the two side forging lower dies 23.

[0021] The multifunctional composite lower die of this invention is mainly used in conjunction with the forging upper die in the prior art (i.e. Figure 1 The upper forging die and the upper trimming die (i.e., the upper forging die) Figure 1 When used in conjunction with the upper cutting die, after forging, the blank on the die can be trimmed without the need for a robotic arm to grasp it. This avoids damage to the blank caused by the robotic arm grasping it, such as bumping, abrasion, and deformation, thus improving the quality of the final product.

[0022] This multifunctional composite lower die integrates a forging lower die 24 and a trimming lower die 22, which can be adjusted according to different usage conditions. Specifically, the trimming lower die 22 and the two side forging lower dies 23 in the split die 2 are controlled by the drive component 3 to adjust the position of the above three to meet the production needs of engine crankshafts.

[0023] A further improvement is that the top surface of the middle and lower die 21 is a positioning support surface 211, and the two side forging lower dies 23 are provided with a split recess 231 on the side adjacent to the middle and lower die 21. The inner wall of the split recess 231 of the two side forging lower dies 23 is used to combine with the positioning support surface 211 to form the cavity wall of the forging lower cavity 241.

[0024] In the initial stage of production, the two side forging dies 23 are moved to the combined station by the drive component 3, such as... Figure 4 As shown, at this time, the two side forging lower dies 23 and the middle lower die 21 are combined to form the forging lower die 24, and the trimming lower die 22 is located directly below the forging lower die 24. In this configuration, the positioning support surface 211 and the inner wall of the recess of the two side forging lower dies 23 are combined to form the cavity wall of the forging lower cavity 241. At this time, the multifunctional composite lower die can be used in conjunction with the forging upper die to forge the billet.

[0025] After forging is completed, the flash generated during forging needs to be trimmed. At this time, the drive assembly 3 controls the two side forging dies 23 to separate and be supported by the middle lower die 21 located in the middle. The trimming die 22 moves upward to between the two side forging dies 23. The top surface of the trimming die 22 contacts the flash of the blank, assisting the middle lower die 21 to achieve stable support for the blank. Then the flash can be removed by the trimming upper die.

[0026] After the flash is removed, the temperature of the billet drops, and the lower cutting die 22 can be driven down by the drive assembly 3. A certain distance is maintained between the two side forging dies 23, so that the outer side of the billet is exposed and the center part is supported by the positioning support surface 211 of the middle and lower dies 21. As the billet temperature drops, the rigidity increases to a certain extent, and it can be gripped by a robot at this time, which facilitates the shaping operation of the billet.

[0027] A further improvement is that the drive assembly 3 drives the trimming die 22 and the two side forging dies 23 to move simultaneously.

[0028] With the above design, after the drive component 3 is running, the trimming die 22 and the two side forging dies 23 move synchronously, which can effectively improve the adjustment efficiency of the multi-functional composite die shape, shorten the adjustment time, and thus improve the product processing efficiency.

[0029] A further improvement is that the two side forging dies 23 move in opposite directions along a distribution direction parallel to their respective directions.

[0030] The drive assembly 3 controls the two side forging dies 23 to move in opposite directions, ensuring that after the two side forging dies 23 move from the combined station to the split station, there is a sufficient gap between the two side forging dies 23, allowing the trimming die 22 to enter between the two side forging dies 23 to cooperate with the middle die 21 to provide auxiliary support for the billet 6.

[0031] A further improvement is that the drive assembly 3 includes a telescopic unit 31 and a connecting rod 32. The telescopic unit 31 is disposed on the lower die base 1, and its output end moves in the vertical direction and is fixedly connected to the middle lower die 21 and the cutting lower die 22. The two sides of the cutting lower die 22 are hinged to the two side forging lower dies 23 through the connecting rod 32.

[0032] Specifically, the telescopic unit 31 is a telescopic hydraulic cylinder arranged in the vertical direction. Its cylinder is fixed on the lower die base 1, and the top of the piston rod is fixedly connected to the horizontal trimming lower die 22. Both sides of the trimming lower die 22 are hinged to the two side forging lower dies 23 through two connecting rods 32. Thus, when the telescopic hydraulic cylinder runs, it drives the trimming lower die 22 to move in the vertical direction. Then, through the connecting rods 32, it acts on the side forging lower dies 23, causing the two side forging lower dies 23 to move in opposite directions. Specifically, when the trimming lower die 22 descends, the two side forging lower dies 23 move closer to each other to move to the combined position. When the trimming lower die 22 rises, the two side forging lower dies 23 move further apart to make room for the trimming lower die 22 to move to the outside of the middle lower die 21.

[0033] A further improvement is that a horizontal slide rail 11 is fixed on the lower die base 1. The slide rail 11 extends along the distribution direction parallel to the two side forging lower dies 23. Each of the two side forging lower dies 23 is provided with a slide bar 232, which is slidably connected to the slide rail 11.

[0034] Specifically, the two side forging dies 23 have the same width direction, and both ends of the two are fixed with slide bars 232 extending along their width direction. A horizontal bar 14 is fixed above the lower die base 1 by a vertical rod 15 extending upward in the vertical direction. The slide rail 11 is fixed above the horizontal bar 14 and slides with the slide bar 232. In this way, the slide bar 232 and the slide rail 11 ensure that the two side forging dies 23 are always at the same height position and move between the split position and the combined position in a direction parallel to their own width direction.

[0035] A further improvement is that the trimming die 22 and the two side forging dies 23 are both provided with positioning through holes 25 extending in the vertical direction, and the lower die base 1 is fixed with guide rods 12 extending in the vertical direction. The guide rods 12 correspond one-to-one with the positioning through holes 25 of the trimming die 22 and are slidably connected.

[0036] The guide rod 12, which is fixed on the lower die base 1, is slidably connected to the positioning through hole 25 on the trimming lower die 22, ensuring that the trimming lower die 22 moves smoothly in the vertical direction. Moreover, the positioning through hole 25 is a through hole, which facilitates the precise docking of the forging upper die and the forging lower die 24, as well as the precise docking of the trimming upper die and the trimming lower die 22, during forging and trimming.

[0037] A further improvement is that the top of the guide rod 12 is located between the top and bottom surfaces of the two side forging dies 23. Both side forging dies 23 are provided with clearance grooves 233 extending along their distribution direction. One end of the clearance groove 233 extends to the side of the corresponding side forging die 23 adjacent to the middle and lower dies 21. The top of the guide rod 12 is located in the clearance grooves 233 of the two side forging dies 23 in the combined working position.

[0038] With the above design, the length of the guide rod 12 is increased to ensure that when the two side forging dies 23 move to the split position, the guide rod 12 still maintains a sliding fit with the positioning through hole 25 on the trimming die 22. In addition, the clearance groove 233 can make room for the upper part of the guide rod 12, so that the two side forging dies 23 can move to the combined position and avoid position interference.

[0039] A further improvement is that the bottom of the middle and lower mold 21 is fixed above the lower mold base 1 by a support rod 212 extending in the vertical direction, and the support rod 212 is located inside the mold hole 221.

[0040] With this design, the support rod 212 is located inside the die hole 221 of the lower die 22 and is fixedly connected to the lower die base 1 to ensure that the position of the lower die 21 is fixed and to prevent its position from shifting. At the same time, it facilitates the movement of the lower die 22 in the vertical direction.

[0041] A further improvement is that a rolling element 13 is provided at the bottom of the lower mold base 1.

[0042] Specifically, the rolling element 13 is a ball bearing, which is densely distributed at the bottom of the lower die base 1. This makes it easy to adjust the position of the multi-functional composite lower die and facilitates its precise docking with the cutting upper die or the forging upper die.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multifunctional composite lower mold for engine crankshafts, characterized in that, include: Lower mold base; A split mold, horizontally positioned above the lower mold base, includes a middle lower mold, a trimming lower mold, and two side forging lower molds. The middle lower mold is fixed above the lower mold base. The two side forging lower molds are located on either side of the middle lower mold and can move between the split-type station and the combined station. The trimming lower mold has a mold hole extending vertically. The mold hole is a through hole. The projection of the middle lower mold on the horizontal plane is located within the projection of the mold hole on the horizontal plane. The trimming lower mold moves vertically. A gap is provided between the side forging lower molds in the split-type station for the trimming lower mold to enter. The middle lower mold and the two side forging lower molds in the combined station combine to form a forging lower mold. The forging lower mold has a forging lower cavity with the opening facing upward. A drive assembly, disposed on the lower die base, drives the trimming lower die and the two side forging lower dies to move.

2. The multifunctional composite lower mold for engine crankshaft according to claim 1, characterized in that: The top surface of the middle and lower die is a positioning support surface. The two side forging lower dies are provided with a split recess on the side adjacent to the middle and lower die. The inner wall of the split recess of the two side forging lower dies is used to combine with the positioning support surface to form the cavity wall of the forging lower cavity.

3. The multifunctional composite lower mold for engine crankshaft according to claim 1, characterized in that: The drive assembly drives the trimming die and the two side forging dies to move simultaneously.

4. The multifunctional composite lower mold for engine crankshaft according to claim 3, characterized in that: The two side forging dies move in opposite directions along their distribution directions.

5. The multifunctional composite lower mold for engine crankshaft according to claim 4, characterized in that: The drive assembly includes a telescopic unit and a connecting rod. The telescopic unit is disposed on the lower die base, and its output end moves in the vertical direction and is fixedly connected to the middle and lower die cutting edge lower die. The two sides of the cutting edge lower die are hinged to the two side forging lower dies through the connecting rod.

6. The multifunctional composite lower mold for engine crankshaft according to claim 4, characterized in that: A horizontal slide rail is fixed on the lower die base. The slide rail extends parallel to the distribution direction of the two side forging lower dies. Each of the two side forging lower dies is provided with a slide bar, which is slidably connected to the slide rail.

7. The multifunctional composite lower mold for an engine crankshaft according to any one of claims 1-6, characterized in that: The trimming die and the two side forging dies are each provided with positioning through holes extending in the vertical direction. A guide rod extending in the vertical direction is fixed on the die base. The guide rod corresponds one-to-one with the positioning through holes of the trimming die and is slidably connected.

8. The multifunctional composite lower mold for engine crankshaft according to claim 7, characterized in that: The top end of the guide rod is located between the top and bottom surfaces of the two side forging dies. Both side forging dies are provided with clearance grooves extending along their distribution direction. One end of the clearance groove extends to the side of the corresponding side forging die adjacent to the middle and lower dies. The top end of the guide rod is located in the clearance grooves of the two side forging dies in the combined working position.

9. The multifunctional composite lower mold for an engine crankshaft according to any one of claims 1-6, characterized in that: The bottom of the middle and lower mold is fixed above the lower mold base by a support rod extending in the vertical direction, and the support rod is located inside the mold hole.

10. The multifunctional composite lower mold for an engine crankshaft according to any one of claims 1-6, characterized in that: The bottom of the lower mold base is provided with a rolling element.

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