Engine balance shaft forging die assembly convenient to take and place

Abstract

The utility model discloses an engine balance shaft forging die assembly convenient to take and place, include: lower mould base is provided with lower cavity, and lower cavity includes lower balance cavity and lower axle body cavity, and be provided with the jacking through -hole on lower mould base, the upper mould base is set up with upper cavity, drive assembly, pack elevating unit and translation unit to drive upper mould base and lower mould base close -mold and part -mold, and the projection of lower cavity on horizontal plane is separated with the projection of upper mould base on horizontal plane under part -mold state, the material of top -feed component includes telescopic unit and tapper, this engine balance shaft forging die assembly convenient to take and place, through translation unit drive lower mould base removes, make the projection of lower cavity on horizontal plane after part -mold and the projection of upper mould base on horizontal plane are separated, and it is convenient to take and place the blank, and the tapper of telescopic unit control lower cavity both sides moves upward, and the blank is stably supported in the upper side of lower cavity, and it is convenient for mechanical hand to catch the blank and carry out subsequent processing, and it is favorable to improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of balance shaft forging technology, and in particular to an engine balance shaft forging die assembly that is easy to pick up and put down. Background Technology

[0002] The forging die for the engine balance shaft is the core tooling for achieving the one-piece molding of the balance shaft (including the eccentric balance block). Because it needs to be adapted to the complex structure of the balance shaft "shaft body + eccentric block" and to ensure strength and precision, hot forging die is usually used.

[0003] In existing technology, the core structure of the forging die for the engine balance shaft mainly includes a pair of upper and lower die holders. The upper and lower die holders each have an upper cavity and a lower cavity, respectively, and a push rod that can move vertically is installed on the lower die holder. During use, the blank is placed in the lower cavity of the lower die holder, and the upper and lower die holders are closed, forming a forging cavity while simultaneously compressing the blank. This initially shapes the blank. During the forming process, excess blank material between the upper and lower die holders and at the opening of the lower die cavity forms flash. The push rod moves upwards to lift the formed blank, making it easier for a robotic arm to grasp and trim the edges.

[0004] In the aforementioned forging dies, the upper die holder is typically positioned directly above the lower die holder. The upper die holder occupies the space directly above the lower die holder, causing inconvenience for the placement and clamping of the billet and reducing processing efficiency. Furthermore, when the billet is ejected upwards by ejector pins, the limited number of ejector pins results in fewer support nodes for the flash and a limited support area, making it difficult to achieve stable support for the billet. This causes the billet to tilt during the actual ejection process, and as the tilt angle increases, it easily detaches from the ejector pins and falls onto the lower die holder, causing deformation after impact. This affects the quality of subsequent processing and hinders the gripping by the robotic arm, thus reducing overall processing efficiency.

[0005] Therefore, it is necessary to improve the existing engine balance shaft forging die. Utility Model Content

[0006] The purpose of this utility model is to overcome the defects in the existing technology and provide an engine balance shaft forging die assembly that is easy to pick up and place, avoids collisions, improves production efficiency, and ensures processing quality.

[0007] To achieve the above technical effects, the technical solution of this utility model is: an engine balance shaft forging die assembly that is easy to pick up and put down, comprising: The lower mold base is horizontally arranged and has a lower cavity on its top surface. The lower cavity includes a lower balancing cavity and a lower shaft cavity that connects to both ends of the lower balancing cavity. The lower mold base is also provided with a lifting through hole that extends in the vertical direction. The lifting through hole is located on both sides of the lower cavity and is adjacent to the connection between the lower shaft cavity and the lower balancing cavity. The upper mold base is horizontally positioned above the lower mold base and has an upper cavity on its bottom surface; The driving assembly includes a lifting unit and a translation unit respectively connected to the upper mold base and the lower mold base to drive the upper mold base and the lower mold base to close and separate the mold. In the closed state, the lower cavity and the upper cavity combine to form a forging cavity. In the separated state, the projection of the lower cavity on the horizontal plane is separated from the projection of the upper mold base on the horizontal plane. The material feeding assembly includes a telescopic unit and a top rod. The top rod corresponds one-to-one with the lifting through hole and is slidably connected in a sealed manner. The telescopic unit is located below the top rod and drives the top rod to move between the material picking station and the storage station. In the material picking station, the top end of the top rod is located above the lifting through hole. In the storage station, the top end of the top rod is located close to the bottom of the top opening of the lifting through hole.

[0008] Preferably, in order to ensure the support effect on the blank, two lifting through holes are provided on both sides of the lower cavity and distributed in a rectangular array.

[0009] Preferably, in order to ensure good contact between the push rod and the outer edge of the blank, the top end of the push rod is provided with a lifting boss or a lifting recess.

[0010] Preferably, to facilitate control of the lifting and lowering movement of the ejector rod to eject the blank, a horizontal pressure platform is also included. The lower mold base slides horizontally on the pressure platform. The pressure platform is provided with guide holes that correspond one-to-one with the lifting through holes. The inner diameter of the guide holes is smaller than the inner diameter of the lifting through holes. The telescopic unit includes a lifting cylinder and a support rod. Both the lifting cylinder and the support rod are vertically arranged. The cylinder barrel of the lifting cylinder is fixed below the pressure platform. The top end of the piston rod is connected to the bottom end of the support rod. The support rod corresponds one-to-one with the guide through holes, and the circumferential outer edge of the support rod is sealed and fitted to the circumferential inner wall of the guide through hole.

[0011] Preferably, in order to facilitate the forging process, some of the billet material can enter the lifting through hole to strengthen the bonding force between the flash and the top of the ejector pin. In the mold-closed state, the bottom end of the ejector pin abuts against the bottom end of the pressure plate, and the top end of the lifting boss is flush with the top end of the lifting through hole, or the top end of the lifting boss is adjacent to the bottom of the top end of the lifting through hole.

[0012] Preferably, in order to ensure good contact between the top rod and the support rod, a plug-in sleeve and a plug-in protrusion are provided between the support rod and the top rod for vertical insertion.

[0013] Preferably, to facilitate the forming of the top rod, the top rod is a top tube, and a thin rod is threadedly connected to the inner wall of the top tube. The top end of the thin rod protrudes from the top end of the top tube, and the bottom end is located inside the top tube. The lifting boss is the part of the thin rod that protrudes from the top end of the top tube, and the insertion sleeve is integrally formed at the bottom end of the top tube.

[0014] Preferably, a sealing ring is integrally connected to the inner side of the top end of the jacking pipe along a coaxial centerline. The thin rod includes a connecting rod portion and a lifting rod portion integrally connected along a coaxial centerline. The lifting rod portion seals through the sealing ring, and the connecting rod portion is threaded to the circumferential inner wall of the jacking pipe.

[0015] Preferably, in order to ensure accurate mold closing, the pressure plate is provided with positioning components that limit the positions of both ends of the lower mold base's movement trajectory, and the output end of the translation unit is connected to the lower mold base through an elastic component.

[0016] Preferably, in order to increase the ejection height of the billet during ejection so as to clamp the forged billet, the height difference between the top of the ejector rod and the lifting through hole is greater than the depth of the lower cavity at the material handling station.

[0017] In summary, compared with the prior art, the engine balance shaft forging die assembly of this utility model, which facilitates the loading and unloading of blanks, moves the lower die base by means of a translation unit, so that the projection of the lower cavity on the horizontal plane after die separation is separated from the projection of the upper die base on the horizontal plane, which facilitates the loading and unloading of blanks. The telescopic unit controls the upward movement of the push rods on both sides of the lower cavity, which stably supports the blank above the lower cavity, making it convenient for the robot to grasp the blank for subsequent processing, thus improving production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment; Figure 2 This is a structural schematic diagram from another perspective of the first embodiment; Figure 3 yes Figure 2 Enlarged view of part A; Figure 4 This is a structural schematic diagram of another usage state of the first embodiment; Figure 5 yes Figure 4 An explosion diagram; Figure 6 This is a schematic diagram of the frame structure of the first embodiment; Figure 7 This is a schematic diagram of the translation unit in the first embodiment; Figure 8 This is a schematic diagram of the upper mold base in the first embodiment; Figure 9 This is a schematic diagram of the lower mold base in the first embodiment; Figure 10 This is a schematic diagram of the final forging die in the second embodiment; Figure 11 yes Figure 10 A schematic diagram of the cross-sectional structure; Figure 12 This is a schematic diagram of the structure of the product forged using this utility model; In the diagram: 1. Lower die base; 11. Pre-forging lower die; 111. Pre-forging lower cavity; 112. Guide recess; 12. Final forging lower die; 121. Final forging lower cavity; 123. Marking recess; 13. Lifting through hole; 14. Slide groove; 2. Upper die base; 21. Pre-forging upper die; 211. Pre-forging upper cavity; 212. Guide boss; 22. Final forging upper die; 221. Final forging upper cavity; 3. Lifting unit; 31. Lifting cylinder; 32. Lifting frame; 33. Guide rod; 4. Translation unit; 41. Translation cylinder; 42. Translation plate; 421. Limiting boss; 43. Connecting pipe; 44. Spring; 45. Sliding plate; 46. Sliding rod; 47. Connecting bar; 5. Frame; 51. 52. Base; 53. Support block; 54. Pressure plate; 541. Guide hole; 55. Support plate; 56. Bracket; 57. Guide sleeve; 58. Slide rail; 69. Positioning bolt; 60. Positioning nut; 61. Ejector assembly; 62. Lifting cylinder; 63. Lifting plate; 64. Support rod; 651. Inserted protruding rod; 66. Top rod; 671. Inserted sleeve; 68. Lifting boss; 69. Sealing ring; 60. Thin rod; 61. Connecting rod part; 62. Lifting rod part; 70. Splicing assembly; 71. Splicing strip; 72. Splicing bolt; 73. Locking bolt; 74. Locking nut; 80. Product; 81. Shaft body; 82. Balance block; 83. Connecting shaft. 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] First Embodiment

[0021] like Figures 1-9 As shown, a forging die assembly for an engine balance shaft, which is easy to pick up and put down according to the first embodiment of this utility model, includes: The lower mold base 1 is horizontally arranged and has a lower cavity on its top surface. The lower cavity includes a lower balance cavity and a lower shaft cavity that connects to both ends of the lower balance cavity. The lower mold base 1 is also provided with a lifting through hole 13 that extends in the vertical direction. The lifting through hole 13 is located on both sides of the lower cavity and is adjacent to the connection between the lower shaft cavity and the lower balance cavity. The upper mold base 2 is horizontally positioned above the lower mold base 1 and has an upper cavity on its bottom surface; The driving assembly includes a lifting unit 3 and a translation unit 4 connected to the upper mold base 2 and the lower mold base 1 respectively, to drive the upper mold base 2 and the lower mold base 1 to close and separate the mold. In the closed state, the lower cavity and the upper cavity are combined to form a forging cavity. In the separated state, the projection of the lower cavity on the horizontal plane is separated from the projection of the upper mold base 2 on the horizontal plane. The top material assembly 6 includes a telescopic unit and a top rod 64. The top rod 64 corresponds one-to-one with the lifting through hole 13 and is slidably connected in a sealed manner. The telescopic unit is located below the top rod 64 and drives the top rod 64 to move between the picking station and the storage station. In the picking station, the top of the top rod 64 is located above the lifting through hole 13. In the storage station, the top of the top rod 64 is close to the bottom of the top opening of the lifting through hole 13.

[0022] In this embodiment, the forging die assembly first adjusts the upper die holder 2 and the lower die holder 1 to the parting state via the drive assembly. Then, the horizontal position of the lower die holder 1 is adjusted via the translation unit 4, so that the projection of the lower cavity on the lower die holder 1 onto the horizontal plane is separated from the projection of the upper die holder 2 onto the horizontal plane, ensuring that there is no obstruction above the lower cavity. This facilitates the robot arm to place the gripped blank into the lower cavity. The height position of the upper die holder 2 is adjusted via the lifting unit 3, and the horizontal position of the lower die holder 1 is adjusted via the translation unit 4, so that the lower cavity moves directly above the upper cavity. The drive assembly, specifically the lifting unit 3, controls the upper die holder 2 and the lower die holder 1 to close the die, so that the upper cavity on the upper die holder 2 and the lower cavity on the lower die holder 1 combine to form a forging cavity, while simultaneously squeezing the blank between them. This forging process shapes the blank and forms flash around it.

[0023] After the billet is forged, the drive assembly controls the upper mold base 2 and the lower mold base 1 to adjust to the mold separation state. Since there is no obstruction above the lower cavity at this time, the ejector assembly 6 runs and the ejector rod 64 driven by the telescopic unit moves upward, so that the ejector rod 64 acts on the flash and lifts the billet. Since the lifting through holes 13 are located on both sides of the lower cavity, it is convenient for the ejector rods 64 to act evenly on the billet from both sides. Moreover, the lifting through holes 13 are close to the connection between the lower shaft cavity and the lower balance cavity. The center of gravity of the forged billet is concentrated near the position of the balance block 82. Therefore, it is ensured that the center of gravity of the billet is between the ejector rods 64 on both sides, so that the ejector rods 64 can be stably supported. Since there is no obstruction above the lower cavity at this time, it is further ensured that the billet is stably supported. On the one hand, it avoids tilting, which makes it convenient for the robot to grasp. On the other hand, it effectively prevents the billet from falling onto the lower die holder 1 after tilting and colliding with the lower die holder 1, which would cause deformation. Thus, by stably supporting the billet, it is beneficial to improve the forging efficiency and accuracy.

[0024] In this embodiment, two lifting through holes 13 are provided on both sides of the lower cavity and distributed in a rectangular array. With this design, when the blank is removed after forging, two push rods 64 are provided on both sides of the blank and correspond to the two ends of the forming position of the balance block 82 on the blank, which further ensures the stable support of the blank and prevents the blank from falling and bumping, thus affecting the forming accuracy of the final product.

[0025] A further improvement is that, at the material handling station, the height difference between the top of the ejector rod 64 and the lifting through hole 13 is greater than the depth of the lower cavity. With the above design, after the billet is lifted by the ejector rod 64, it can be ensured that the billet is located above the opening of the lower cavity. In this way, there is enough space above and below the billet, which makes it convenient for the robot to grasp the forged billet.

[0026] A further improvement is that the top of the push rod 64 is provided with a lifting boss 642 or a lifting recess. This design allows excess material to be formed around the lifting boss 642 or inside the lifting recess during the forging process, increasing the contact area between the flash and the top of the push rod 64. This strengthens the contact force between the flash and the push rod 64, preventing the flash from detaching from the push rod 64 when it is lifted upwards. In this embodiment, the top of the push rod 64 has a lifting boss 642 integrally formed along its coaxial centerline. The thickness of the lifting boss 642 is within 0.5-1.5mm. This ensures sufficient contact area between the lifting boss 642 and the flash, while also preventing the lifting boss 642 from being too thick and affecting subsequent trimming.

[0027] A further improvement is that, in this embodiment, the lower die holder 1 has two lower cavities, namely a pre-forging lower cavity 111 and a final forging lower cavity 121. Correspondingly, the upper die holder 2 has two upper cavities, namely a pre-forging upper cavity 211 and a final forging upper cavity 221. When the lower die holder 1 and the upper die holder 2 are closed, they enclose two forging cavities, namely a pre-forging cavity formed by the combination of the pre-forging lower cavity 111 and the pre-forging upper cavity 211, and a final forging cavity formed by the combination of the final forging lower cavity 121 and the final forging upper cavity 221. This facilitates the pre-forging and final forging of the billet, improving the forming accuracy of the final product 8.

[0028] Finally, using the forging die of this embodiment, and after edge trimming and shaping, the desired result is obtained as shown below. Figure 12 The product 8 shown includes two balance blocks 82. The two opposite sides of the two balance blocks 82 are fixedly connected by a connecting shaft 83. Both opposite sides are integrally connected with a shaft body 81 with the same center line. The center line of the shaft body 81 is separated from the center line of the connecting shaft 83.

[0029] A further improvement is that the upper die holder 2 includes a pre-forging upper die 21 and a final forging upper die 22 that are detachably connected, with the pre-forging upper cavity 211 and the final forging upper cavity 221 respectively disposed on the pre-forging upper die 21 and the final forging upper die 22; the lower die holder 1 includes a pre-forging lower die 11 and a final forging lower die 12 that are detachably connected, with the pre-forging lower cavity 111 and the final forging lower cavity 121 respectively disposed on the pre-forging lower die 11 and the final forging lower die 12.

[0030] With the above structure, both the upper die holder 2 and the lower die holder 1 are detachable and separate structures. Thus, when the cavity wall of one of the pre-forging upper cavity 211, the final forging upper cavity 221, the pre-forging lower cavity 111, and the final forging lower cavity 121 experiences severe wear, only the part corresponding to the severely worn location needs to be replaced, without replacing the entire upper die holder 2 or the lower die holder 1, thereby reducing replacement costs.

[0031] The pre-forging upper die 21 and the final forging upper die 22, as well as the pre-forging lower die 11 and the final forging lower die 12, are connected by splicing components 7.

[0032] Specifically, the pre-forging upper die 21, the final forging upper die 22, the pre-forging lower die 11, and the final forging lower die 12 are all rectangular parallelepiped structures with basically the same length, width, and height dimensions and orientation. Both ends of the four dies are provided with splicing grooves extending along their respective width directions, and the cross-sectional shape and size of each splicing groove are the same.

[0033] More specifically, the two ends of the pre-forging upper die 21 and the final forging upper die 22 are flush and connected along their width direction, and the two ends of the pre-forging lower die 11 and the final forging lower die 12 are flush and connected along their width direction, so that the splicing grooves at both ends of the pre-forging upper die 21 and the final forging upper die 22, and the splicing grooves at both ends of the pre-forging lower die 11 and the final forging lower die 12 are combined to form an assembly through groove.

[0034] The splicing assembly 7 includes a splicing strip 71, a splicing bolt 72, a locking bolt 73, and a locking nut 74. The splicing strip 71 is adapted to the assembly through slot. For the upper die base 2, the ends of the pre-forging upper die 21 and the final forging upper die 22 are connected to the splicing strip 71 by the splicing bolt 72. The locking bolt 73 and the locking nut 74 are threadedly connected and connected to the output end of the lifting unit 3, so as to control the upper die base 2 to move in the vertical direction through the lifting unit 3. For the lower die base 1, the ends of the pre-forging lower die 11 and the final forging lower die 12 are connected to the splicing strip 71 by the splicing bolt 72, and one end of them is connected to the output end of the translation unit 4 by the threaded locking bolt 73 and the locking nut 74. The translation unit 4 drives the lower die base 1 to move in the length direction parallel to the pre-forging lower die 11.

[0035] A further improvement is that this embodiment also includes a frame 5. The frame 1 includes a horizontal base 51. The top surface of the base 51 is fixedly connected to a horizontal pressure platform 54 through a column 52 and a support block 53. The pressure platform 54 is provided with guide holes 541 that correspond one-to-one with the lifting through holes 13. The inner diameter of the guide holes 541 is smaller than the inner diameter of the lifting through holes 13. The telescopic unit includes a lifting cylinder 61 and a support rod 63. Both the lifting cylinder 61 and the support rod 63 are vertically arranged. The cylinder of the lifting cylinder 61 is fixed below the pressure platform 54. The top end of the piston rod is connected to the bottom end of the support rod 63. The support rod 63 corresponds one-to-one with the guide holes 541, and the circumferential outer edge of the support rod 63 is sealed and fitted with the circumferential inner wall of the guide holes 541.

[0036] With the above design, the support rod 63 can move upward through the guide hole 541 to support the top rod 64 and lift the billet upward. The outer diameter of the supporting top rod 64 is the same as the inner diameter of the lifting through hole 13. The inner diameter of the lifting through hole 13 is larger than the inner diameter of the guide hole 541, which can prevent the top rod 64 from falling downward.

[0037] More specifically, in the mold-closed state, the top of the lifting boss 642 is adjacent to the bottom of the top of the lifting through hole 13. With this design, during the forging process, some excess material of the billet, after forming flash around the lower cavity opening, enters the top of the lifting through hole 13 and contacts the lifting boss 642. This enhances the contact area and bonding strength between the flash and the lifting boss 642, allowing the ejector rod 64 to smoothly lift the billet when it moves upward, facilitating gripping by the robotic arm.

[0038] A further improvement is that a plug-in sleeve 641 and a plug-in protrusion 631 are provided between the support rod 63 and the top rod 64 for vertical insertion.

[0039] Specifically, such as Figure 3 As shown, the insertion protrusion 631 is integrally formed on the top of the support rod 63 along the coaxial centerline, and the insertion sleeve 641 is integrally formed on the bottom of the top rod 64 along the coaxial centerline. The outer diameter of the insertion protrusion 631 is smaller than the outer diameter of the support rod 63 and equal to the inner diameter of the insertion sleeve 641. This ensures that there is sufficient contact area between the support rod 63 and the top rod 64, so that when the support rod 63 moves upward, it can drive the top rod 64 to move upward stably.

[0040] In this embodiment, the number of support rods 63, top rods 64, lifting through holes 13 and guide through holes 541 are equal and correspond to each other. The cylinder of the lifting cylinder 61 is fixed on the base 51. A horizontal lifting plate 62 is fixedly connected to the top of the piston rod. The support rod 63 is fixed above the lifting plate 62 and its outer circumferential edge is sealed and fitted with the inner circumferential wall of the guide through hole 541. The top rod 64 is located inside the lifting through hole 13 and its outer circumferential edge is sealed and fitted with the inner circumferential wall of the lifting through hole 13.

[0041] When the top material assembly 6 is running, the lifting cylinder 61 drives the lifting plate 62 to move upward, so that the top of the support rod 63 acts on the bottom of the top rod 64, and the top rod 64 moves upward, so that the top rod 64 acts on the flange around the billet, thereby driving the billet to move upward and separate from the pre-forging lower cavity 111 and the final forging lower cavity 121. At the same time, the billet is located on one side of the upper mold base 2, which is convenient for the robot to grasp.

[0042] To achieve smooth lifting and lowering movement of the upper mold base 2, such as Figure 4 and Figure 5 As shown, the lifting unit 3 includes a lifting cylinder 31 disposed on the top of the bracket 55. The cylinder of the lifting cylinder 31 is vertically downward and fixed above the bracket 55. The bottom end of the piston rod is fixedly connected to a lifting frame 32. The lifting frame 32 is fixedly connected to the upper mold base 2 by a threaded locking bolt 73 and a locking nut 74. The top of the lifting frame 32 is fixed with a guide rod 33 extending in the vertical direction. The bracket 55 is fixed with a guide sleeve 551 extending in the vertical direction. The guide rod 33 and the guide sleeve 551 are slidably engaged.

[0043] A further improvement is that the pressure plate 54 is equipped with positioning components that limit the positions of both ends of the movement trajectory of the lower mold base 1, and the output end of the translation unit 4 is connected to the lower mold base 1 through an elastic component.

[0044] By utilizing the elastic deformation of the elastic element and the positioning element to limit the sliding range of the lower mold base 1, it is ensured that after the translation unit 4 has been in operation, the lower mold base 1 can abut against one of the positioning elements, ensuring the precise mold closing of the upper mold base 2 and the lower mold base 1, and that after the lower mold base 1 moves to the side below the upper mold base 2, the projection of the lower cavity on the horizontal plane is separated from the projection of the upper mold base 2 on the horizontal plane.

[0045] Specifically, such as Figure 6 As shown, both the pre-forging lower die 11 and the final forging lower die 12 are provided with grooves 14 extending along their own length at their bottoms, such as... Figure 5 As shown, the top surface of the pressure platform 54 is provided with two slide rails 56 that are arranged side by side along the width direction of the pre-forging lower die 11 and extend along the length direction of the pre-forging lower die 11. Both ends of the two slide rails 56 are fixedly connected to the pressure platform 54 by threaded positioning bolts 57 and positioning nuts 58. The two slide rails 56 are slidably engaged with the slide grooves 14 of the pre-forging lower die 11 and the final forging lower die 12, respectively. The cap of the positioning bolt 57 is located above the slide rail 56, forming the aforementioned positioning element, which limits the positions of the two ends of the sliding trajectory of the lower die base 1.

[0046] like Figure 7 As shown, the translation unit 4 includes a translation cylinder 41. The cylinder cylinder axial direction is parallel to the length direction of the slide rail 56. The cylinder cylinder is fixed above the base 51. A translation plate 42 is fixedly connected to the piston rod. A limiting boss 421 is integrally formed at one end of the translation plate 42 opposite to the translation cylinder 41. A sliding plate 45 is connected to the limiting boss 421 through an elastic element, which is a spring 44. A connecting strip 47 is fixedly connected to one end of the sliding plate 45 opposite to the translation cylinder 41 through a sliding rod 46. The two ends of the connecting strip 47 are fixedly connected to the lower mold base 1 through threaded locking bolts 73 and locking nuts 74. The translation unit 4 also includes a connecting pipe 43. One end of the connecting pipe 43 near the translation cylinder 41 is threadedly connected to the translation plate 42, and the other end is sealed and sleeved outside the sliding rod 46.

[0047] With the above design, the piston rod of the translation cylinder 41 extends outward, pushing the translation plate 42 and compressing the spring 44. This causes the limiting boss 421 to abut against the sliding plate 45. The piston rod then continues to extend outward, pushing the lower mold base 1, causing it to move to the side and below the upper mold base 2. Figure 1As shown, the lower mold base 1 abuts against the cap of one of the positioning bolts 57, facilitating the removal or placement of the blank; when the piston rod continues to retract, it first pulls the translation plate 42, causing the end of the connecting pipe 43 away from the translation cylinder 41 to abut against the sliding plate 45, thereby pulling the sliding plate 45 to move. Through the sliding rod 46 and the connecting strip 47, it drives the lower mold base 1 to move, so that the lower mold base 1 moves directly below the upper mold base 2. The lower mold base 1 abuts against the cap of the other positioning bolt 57, facilitating the lifting unit 3 to drive the upper mold base 2 to descend and close with the lower mold base 1. Figure 4 As shown.

[0048] A further improvement is that a guide boss 212 and a guide recess 112 are provided between the lower die holder 1 and the upper die holder 2, which are interlocked in the vertical direction. Specifically, the guide recess 112 is integrally formed on the pre-forging lower die 11 and is located on both sides of the lower balance cavity. When the die is closed, the guide boss 212 is located on both sides of the pre-forging cavity and the lifting through hole 13 is located between the guide bosses 212 on both sides.

[0049] By adopting this design, the guide bosses 212 and guide recesses 112 that interlock can not only achieve precise docking between the lower die holder 1 and the upper die holder 2, but also form a baffle wall during the pre-forging process, which surrounds the two sides of the balance cavity, so that the billet is concentrated in the balance cavity in the middle position, ensuring the forming quality of the balance block 82.

[0050] Second Embodiment

[0051] like Figure 10 and Figure 11 As shown, the second embodiment of this utility model provides an easy-to-remove engine balance shaft forging die assembly, which is based on the first embodiment. The difference is that the push rod 64 is a push tube, and a thin rod 65 is threadedly connected to the inner wall of the push tube. The top end of the thin rod 65 protrudes from the top end of the push tube, and the bottom end is located inside the push tube. The lifting boss 642 is the part of the thin rod 65 that protrudes from the push tube, and the insertion sleeve 641 is integrally formed at the bottom end of the push tube.

[0052] This design facilitates the forming of the top rod 64, ensures good contact between the top of the top rod 64 and the blank flash, and between the bottom of the top rod 64 and the support rod 63. Furthermore, the thin rod 65 is threadedly connected to the top tube, which facilitates the adjustment of the relative axial position between the thin rod 65 and the top rod 64, thereby enabling the adjustment of the thickness of the lifting boss 642.

[0053] More specifically, a sealing ring 643 is integrally connected to the inner side of the top of the jacking pipe along the coaxial centerline. The thin rod 65 includes a connecting rod part 651 and a lifting rod part 652 integrally connected along the coaxial centerline. The lifting rod part 652 seals through the sealing ring 643. The connecting rod part 651 is threaded to the circumferential inner wall of the jacking pipe. The outer diameter of the connecting rod part 651 is larger than the outer diameter of the lifting rod part 652.

[0054] With the above structural design, the connecting rod 651 is threaded to the inner wall of the jacking pipe, which makes it easy to adjust the relative axial position of the thin rod 65 and the jacking pipe, thereby adjusting the axial length of the part of the lifting rod 652 that protrudes from the outer side of the sealing ring 643, which means that the thickness of the lifting boss 642 can be easily adjusted.

[0055] 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. An easy-to-remove engine balance shaft forging die assembly, characterized in that, include: The lower mold base is horizontally arranged and has a lower cavity on its top surface. The lower cavity includes a lower balancing cavity and a lower shaft cavity that connects to both ends of the lower balancing cavity. The lower mold base is also provided with a lifting through hole that extends in the vertical direction. The lifting through hole is located on both sides of the lower cavity and is adjacent to the connection between the lower shaft cavity and the lower balancing cavity. The upper mold base is horizontally positioned above the lower mold base and has an upper cavity on its bottom surface; The driving assembly includes a lifting unit and a translation unit respectively connected to the upper mold base and the lower mold base to drive the upper mold base and the lower mold base to close and separate the mold. In the closed state, the lower cavity and the upper cavity combine to form a forging cavity. In the separated state, the projection of the lower cavity on the horizontal plane is separated from the projection of the upper mold base on the horizontal plane. The material feeding assembly includes a telescopic unit and a top rod. The top rod corresponds one-to-one with the lifting through hole and is slidably connected in a sealed manner. The telescopic unit is located below the top rod and drives the top rod to move between the material picking station and the storage station. In the material picking station, the top end of the top rod is located above the lifting through hole. In the storage station, the top end of the top rod is located close to the bottom of the top opening of the lifting through hole.

2. The engine balance shaft forging die assembly for easy handling as described in claim 1, characterized in that: The lower cavity has two lifting through holes on both sides, arranged in a rectangular array.

3. The engine balance shaft forging die assembly for easy handling as described in claim 1, characterized in that: The top of the top rod is provided with a lifting boss or a lifting recess.

4. The engine balance shaft forging die assembly for easy handling as described in claim 3, characterized in that: It also includes a horizontal pressure platform, on which the lower mold base slides horizontally. The pressure platform is provided with guide holes that correspond one-to-one with the lifting through holes. The inner diameter of the guide holes is smaller than that of the lifting through holes. The telescopic unit includes a lifting cylinder and a support rod. Both the lifting cylinder and the support rod are vertically arranged. The cylinder barrel of the lifting cylinder is fixed below the pressure platform. The top end of the piston rod is connected to the bottom end of the support rod. The support rod corresponds one-to-one with the guide holes, and the outer circumferential edge of the support rod is sealed and fitted to the inner circumferential wall of the guide holes.

5. The engine balance shaft forging die assembly for easy handling according to claim 4, characterized in that: In the mold-closed state, the bottom end of the ejector pin abuts against the bottom end of the pressure plate, and the top end of the lifting boss is flush with the top end of the lifting through hole, or the top end of the lifting boss is adjacent to the bottom of the top end of the lifting through hole.

6. The engine balance shaft forging die assembly for easy handling according to claim 4, characterized in that: A plug-in sleeve and a plug-in protrusion are provided between the support rod and the top rod for vertical insertion.

7. The engine balance shaft forging die assembly for easy handling according to claim 6, characterized in that: The top rod is a top tube, and a thin rod is threadedly connected to the inner wall of the top tube. The top end of the thin rod protrudes from the top end of the top tube, and the bottom end is located inside the top tube. The lifting boss is the part of the thin rod that protrudes from the top end of the top tube. The insertion sleeve is integrally formed at the bottom end of the top tube.

8. The engine balance shaft forging die assembly for easy handling according to claim 7, characterized in that: The top inner side of the jacking pipe is integrally connected with a sealing ring along the coaxial centerline. The thin rod includes a connecting rod part and a lifting rod part integrally connected along the coaxial centerline. The lifting rod part seals through the sealing ring, and the connecting rod part is threaded to the circumferential inner wall of the jacking pipe.

9. The easily accessible engine balance shaft forging die assembly according to any one of claims 1-8, characterized in that: The pressure plate is equipped with positioning components that limit the positions of both ends of the lower mold base's movement trajectory, and the output end of the translation unit is connected to the lower mold base through an elastic component.

10. The easily accessible engine balance shaft forging die assembly according to any one of claims 1-8, characterized in that: At the material handling station, the height difference between the top of the push rod and the lifting through hole is greater than the depth of the lower cavity.

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