Hollow and solid lining necking tool

Abstract

The invention discloses a hollow and solid lining necking tool, and relates to the technical field of automobile chassis lining necking, the hollow and solid lining necking tool comprises a tool main body, the tool main body comprises a plurality of groups of extrusion blocks, the plurality of groups of extrusion blocks are encircled to form a barrel shape, the plurality of groups of extrusion blocks are elliptical, the bottom end of each group of extrusion block is provided with a group of lower oil grooves, and the lower oil grooves are communicated with the lower oil grooves. The inner wall of the lower oil groove is slidably connected with two first abutting blocks, the two first abutting blocks extend out of the extrusion block, and the side wall of each first abutting block is fixedly connected with a reset spring. By designing the side walls of the multiple sets of extrusion blocks, the inner wall of the barrel-shaped structure defined by the multiple sets of extrusion blocks is oval, the outer metal sleeve and the inner rubber of the bush are extruded into oval sections, the bush has a larger deformation space in the large-diameter direction of an oval hole, and therefore the dynamic performance of a suspension system is optimized, and the service life of the suspension system is prolonged. And compared with a circular cross section, the mounting direction of the bushing is easier to determine when the bushing is mounted.

Description

Technical Field

[0001] The invention relates to the technical field of automobile chassis bushing shrinkage, in particular to a hollow solid bushing shrinkage tool. Background Art

[0002] Automotive bushing shrinking refers to improving the performance and durability of bushings through shrinking treatment. The shrinking treatment mainly compresses the outer jacket radially to make the rubber molecules have pre-existing compressive stress, so that they are not affected by tensile stress during operation, thereby improving the durability of the product. The shrinking treatment can make the bushing better withstand external loads during use and reduce internal cracks and early damage caused by excessive tensile stress. By adjusting the compression amount, the bushing can be free from tensile stress during operation, thereby improving its stability and durability. When shrinking the bushing, the bushing is placed inside the tooling and squeezed through the tooling, so that the outer wall diameter of the bushing is reduced, thereby squeezing the internal rubber.

[0003] However, the above technical solution still has certain defects. During use, the bushing needs to be reshaped after shrinking. In addition, there is a certain gap between the dovetail groove and the dovetail pin on the tooling during the shrinking process, which causes the tooling to shake during the shrinking process, resulting in displacement between the tooling and the bushing. For this reason, a hollow solid core bushing shrinking tooling is proposed. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a hollow solid core bushing shrinking tool to solve the technical problems raised in the above background.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hollow solid core bushing shrinking tool, comprising a tool body, the tool body comprising a plurality of extrusion blocks, the plurality of extrusion blocks are surrounded into a barrel shape, the plurality of extrusion blocks are elliptical, the bottom ends of each group of the extrusion blocks are respectively provided with a group of lower oil grooves, the inner walls of the lower oil grooves are slidably connected with two groups of first abutment blocks, the two groups of first abutment blocks extend to the outside of the extrusion blocks, the side walls of each group of the first abutment blocks are respectively fixedly connected with a group of return springs, the ends of the return springs are fixedly connected with the inner walls of the lower oil grooves, the inner walls of the lower oil grooves are connected with two groups of connecting pipes, the inner walls of each group of the extrusion blocks are provided with an upper oil groove near the top, the side walls of the extrusion blocks are provided with a dovetail groove, the upper oil groove is connected to the inside of the dovetail groove, the inner walls of the upper oil grooves are slidably connected with two groups of second abutment blocks, and the top ends of the connecting pipes are connected to the upper oil grooves; The exterior of the tooling body is sleeved with a retracting mechanism, which includes a plurality of side panels, and the side walls of each group of side panels are respectively fixedly connected with a group of dovetail pins, and the dovetail pins are slidably sleeved on the inner walls of a group of dovetail grooves.

[0006] As a preferred technical solution, a set of upper sliders are respectively and slidably connected to the top ends of each group of the extrusion blocks. A curling plate is fixedly connected to the top ends of the upper sliders. A upper hydraulic rod is fixedly connected to the side wall of the upper slider. The end of the upper hydraulic rod is fixedly connected to the top end of the extrusion block.

[0007] As a preferred technical solution, the bottom end of the upper hydraulic rod is communicated with a communication valve. The bottom end of the communication valve is communicated with the inside of the upper oil groove.

[0008] As a preferred technical solution, a through hole is formed in the inner wall of the communication valve. A sealing plate is slidably connected to the inside of the communication valve. The sealing plate is attached above the through hole. Two groups of pressure springs are fixedly connected to the top end of the sealing plate. The top ends of the pressure springs are fixedly connected to the inner wall of the communication valve.

[0009] As a preferred technical solution, the contraction mechanism further includes an outer frame. The outer frame is slidably sleeved on the outer walls of multiple groups of side plates. A guiding block is fixedly connected to the bottom end of the side plate. Multiple groups of sliding grooves that match the guiding blocks are formed in the bottom end of the outer frame.

[0010] As a preferred technical solution, a set of hooks are respectively fixedly connected to the bottom ends of multiple groups of the guiding blocks. An elastic ring is sleeved on the outer walls of multiple groups of the hooks. The elastic ring is an elastic metal ring with an opening.

[0011] As a preferred technical solution, multiple groups of sliding rods are slidably sleeved on the side wall of the outer frame. A bottom plate is fixedly connected to the bottom ends of multiple groups of the sliding rods. A lower hydraulic rod is fixedly sleeved on the inner wall of the bottom plate. The top end of the lower hydraulic rod is fixedly connected to the bottom end of the outer frame.

[0012] As a preferred technical solution, a set of sliding rods are respectively fixedly connected to the top ends of each group of the sliding rods. A rotating arm is slidably sleeved on the outer wall of the sliding rod. A sliding groove is formed at the position where the rotating arm contacts the sliding rod. A roller is rotatably connected to the end of the rotating arm.

[0013] In summary, the present invention mainly has the following beneficial effects: 1. By designing the side walls of multiple groups of the extrusion blocks, the inner wall of the barrel-shaped structure formed by multiple groups is elliptical, so that when the bushing is extruded, the outer metal sleeve and the internal rubber of the bushing are extruded into an elliptical cross-section, enabling the bushing to have a larger deformation space in the major diameter direction of the elliptical hole, thereby optimizing the dynamic performance of the suspension system. And compared with the circular cross-section, it is easier to determine the installation direction when installing the bushing; 2. In the process of multiple groups of extrusion blocks approaching the center, the first abutting blocks on adjacent extrusion blocks contact and push against each other in an arc shape, so that the hydraulic oil inside the lower oil groove is pushed into the upper oil groove, causing the second abutting block to be pushed, so that the second abutting block tightly fits on the outer wall of the dovetail pin. And the excess hydraulic oil is discharged into the upper hydraulic rod, so that the curling plate fits against the upper edge of the bushing, thereby finishing the edge curling at the upper edge of the bushing. 3. The contraction and extension of the lower hydraulic rod drive the sliding rod, thereby pushing the swing arm, so that the roller pushes the side plate to slide towards the center of the outer frame, so that the extrusion block squeezes the bushing. And through the elastic force of the elastic ring, when the roller does not push the side plate, the elastic ring rebounds to drive the side plate to reset, so that in the process of necking the bushing, the effect of fast and simple necking speed is achieved, and the processing efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the front view structural schematic diagram of the present invention; Figure 2 is the front view structural schematic diagram of the contraction mechanism of the present invention; Figure 3 is the structural schematic diagram of the swing arm of the present invention; Figure 4 is the front view structural schematic diagram of the present invention; Figure 5 is the structural schematic diagram of the present invention with the outer frame removed; Figure 6 is the structural schematic diagram of the connection state between the side plate and the extrusion block of the present invention; Figure 7 is the sectional structural schematic diagram of the bottom end of the extrusion block of the present invention; Figure 8 is the sectional structural schematic diagram of the top end of the extrusion block of the present invention; Figure 9 is the sectional structural schematic diagram of the curling plate of the present invention; Figure 10 is the internal structural schematic diagram of the communication valve of the present invention.

[0015] In the figure: 1, tooling main body; 2, contraction mechanism; 101, extrusion block; 102, lower oil groove; 103, first abutting block; 104, return spring; 105, communication pipe; 106, dovetail groove; 107, second abutting block; 108, upper oil groove; 109, upper slider; 110, curling plate; 111, upper hydraulic rod; 112, communication valve; 113, through hole; 114, sealing plate; 115, pressure spring; 201. Outer frame; 202. Slide rod; 203. Base plate; 204. Sliding rod; 205. Lower hydraulic rod; 206. Rotating arm; 207. Sliding groove; 208. Roller; 209. Side plate; 210. Dovetail pin; 211. Guide block; 212. Hook; 213. Elastic ring. Detailed implementation manner

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0017] The embodiments of the present invention will be described below according to its overall structure.

[0018] A blank and solid bushing necking tooling, as Figures 1 to 10 shown, includes a tooling main body 1. The tooling main body 1 includes multiple groups of extrusion blocks 101. The multiple groups of extrusion blocks 101 are arranged in a barrel shape. An oval shape is presented between the multiple groups of extrusion blocks 101. A group of lower oil grooves 102 are respectively opened at the bottom ends of each group of extrusion blocks 101. Two groups of first abutting blocks 103 are slidably connected to the inner walls of the lower oil grooves 102. The two groups of first abutting blocks 103 extend to the outside of the extrusion blocks 101. A group of return springs 104 are respectively fixedly connected to the side walls of each group of first abutting blocks 103. The ends of the return springs 104 are fixedly connected to the inner walls of the lower oil grooves 102. Two groups of connecting pipes 105 are communicated with the inner walls of the lower oil grooves 102. Upper oil grooves 108 are opened at positions near the top ends of the inner walls of each group of extrusion blocks 101. Dovetail grooves 106 are opened on the side walls of the extrusion blocks 101. The upper oil grooves 108 are communicated to the inside of the dovetail grooves 106. Two groups of second abutting blocks 107 are slidably connected to the inner walls of the upper oil grooves 108. The top ends of the connecting pipes 105 are communicated to the upper oil grooves 108; A contraction mechanism 2 is sleeved outside the tooling main body 1. The contraction mechanism 2 includes multiple groups of side plates 209. A group of dovetail pins 210 are respectively fixedly connected to the side walls of each group of side plates 209. The dovetail pins 210 are slidably sleeved on the inner walls of a group of dovetail grooves 106.

[0019] By placing the bushing between multiple groups of extrusion blocks 101, multiple groups of extrusion blocks 101 surround the outside of the bushing, the contact positions of multiple groups of extrusion blocks 101 and the bushing are in an elliptical state, and multiple groups of extrusion blocks 101 move closer to the middle, so that the multiple groups of extrusion blocks 101 squeeze the outer wall of the bushing, so that the outer metal sleeve and the inner rubber of the bushing are squeezed into an elliptical cross-section, so that the bushing has a larger deformation space in the major diameter direction of the elliptical hole, and the directions of the forces applied to different components in the suspension system are different. Through the above design, the bushing can be installed in accordance with the main force direction of the components in the automobile chassis suspension system, thereby optimizing the dynamic performance of the suspension system, and compared with the circular cross-section, it is easier to determine the installation direction of the bushing during installation. When using the tooling body 1, by setting the dovetail grooves 106 on the multiple groups of extrusion blocks 101 on the dovetail pins The outer wall of 210, in the process of multiple groups of extrusion blocks 101 approaching each other, the first abutment blocks 103 on the two adjacent groups of extrusion blocks 101 push each other, so that the first abutment blocks 103 slide into the lower oil groove 102, so that the first abutment blocks 103 compress the reset spring 104, and push the hydraulic oil in the lower oil groove 102 into the connecting pipe 105, so that the hydraulic oil flows into the upper oil groove 108, so that the hydraulic oil pushes the second abutment blocks 107 to slide out of the upper oil groove 108, so that the two groups of second abutment blocks 107 are clamped on the outer wall of the dovetail pin 210, so that the multiple groups of extrusion blocks 101 will not shake or move during the extrusion of the outer wall of the bushing, avoid the extrusion blocks 101 rubbing on the bushing surface to produce scratches or the bushing surface is uneven, and avoid the gap between the dovetail groove 106 and the dovetail pin 210 affecting the processing effect.

[0020] Please refer to Figure 8 , Figure 9 and Figure 10 The top of each group of extrusion blocks 101 is slidably connected to a group of upper sliders 109, the top of the upper sliders 109 is fixedly connected to a curling plate 110, the side wall of the upper sliders 109 is fixedly connected to an upper hydraulic rod 111, the end of the upper hydraulic rod 111 is fixedly connected to the top of the extrusion block 101, the bottom end of the upper hydraulic rod 111 is connected to a connecting valve 112, the bottom end of the connecting valve 112 is connected to the interior of the upper oil tank 108, the inner wall of the connecting valve 112 is provided with a through hole 113, the interior of the connecting valve 112 is slidably connected to a sealing plate 114, the sealing plate 114 is attached to the top of the through hole 113, the top of the sealing plate 114 is fixedly connected to two groups of pressure springs 115, and the top of the pressure spring 115 is fixedly connected to the inner wall of the connecting valve 112.

[0021] During the operation of the above technical solution, when the hydraulic oil inside the lower oil tank 102 flows into the upper oil tank 108, part of the hydraulic oil flows into the inside of the connecting valve 112. However, due to the elastic force of the pressure spring 115, the sealing plate 114 blocks the through hole 113. Therefore, the hydraulic oil can only push the second abutting block 107 to fit against the dovetail pin 210. However, as multiple groups of first abutting blocks 103 are continuously pushed into the lower oil tank 102, the oil pressure inside the upper oil tank 108 continuously increases, causing the oil pressure to push the sealing plate 114 to slide upward, thereby compressing the pressure spring 115. The upper hydraulic rod 111 is already filled with hydraulic oil inside. At this time, the pressure of the hydraulic oil is transmitted to the inside of the upper hydraulic rod 111, causing the upper hydraulic rod 111 to extend and push the crimping plate 110 to move. When the upper edge of the bushing contacts the crimping plate 110, it rolls inward along the curvature of the crimping plate 110, thereby achieving the effect of crimping the upper edge of the outer tube of the bushing.

[0022] Please refer specifically to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the contraction mechanism 2 further includes an outer frame 201. The outer frame 201 is slidably sleeved on the outer walls of multiple groups of side plates 209. The bottom ends of the side plates 209 are fixedly connected with guide blocks 211. Multiple groups of chutes that match the guide blocks 211 are opened at the bottom end of the outer frame 201. A group of hooks 212 are respectively fixedly connected to the bottom ends of multiple groups of guide blocks 211. An elastic ring 213 is sleeved on the outer walls of multiple groups of hooks 212. The elastic ring 213 is an elastic metal ring with an opening. Multiple groups of sliding rods 202 are slidably sleeved on the side walls of the outer frame 201. The bottom ends of multiple groups of sliding rods 202 are fixedly connected with a bottom plate 203. An inner wall of the bottom plate 203 is fixedly sleeved with a lower hydraulic rod 205. The top end of the lower hydraulic rod 205 is fixedly connected to the bottom end of the outer frame 201. A group of sliding rods 204 are respectively fixedly connected to the top ends of each group of sliding rods 202. A rotating arm 206 is slidably sleeved on the outer wall of the sliding rod 204. A sliding groove 207 is opened at the position where the rotating arm 206 contacts the sliding rod 204. A roller 208 is rotatably connected to the end of the rotating arm 206.

[0023] When necking is required, the lower hydraulic rod 205 contracts, causing the bottom plate 203 to move closer to the outer frame 201. As a result, the bottom plate 203 pushes multiple sliding rods 202 upward. During the upward sliding process of the sliding rods, they push the sliding rod 204 upward, causing the sliding rod 204 to slide inside the sliding groove 207 and pushing the rotating arm 206 to flip. During the flipping process of the rotating arm 206, the roller 208 is driven to flip, so that the roller 208 squeezes the side plate 209. At this time, multiple side plates 209 move closer to the middle simultaneously, causing multiple hooks 212 to move closer to the middle, thereby compressing the elastic ring 213. During the process of multiple side plates 209 moving closer to the middle simultaneously, multiple extrusion blocks 101 are driven towards the middle hole, so that the extrusion blocks 101 perform necking on the bushing. After necking is completed, the lower hydraulic rod 205 extends, increasing the distance between the bottom plate 203 and the outer frame 201, causing the sliding rods 202 to descend. At this time, the roller 208 flips and resets in the reverse direction under the drive of the rotating arm 206, and the side plate 209 is no longer squeezed by the roller 208. Therefore, under the resilience of the elastic ring 213, the hook 212 drives the guide block 211 to reset, and the guide block 211 drives the side plate 209 to reset, causing the side plate 209 to drive the extrusion block 101 to reset through the dovetail pin 210 and the dovetail groove 106. After the extrusion block 101 resets, the adjacent first abutting blocks 103 no longer push against each other. At this time, the resilience of the return spring 104 pushes the first abutting block 103 to reset, causing the hydraulic oil in the upper oil groove 108 to be drawn back into the lower oil groove 102, and a reset occurs inside the upper oil groove 108, so that the second abutting block 107 slides into the upper oil groove 108, and the elastic force of the pressure spring 115 pushes the sealing plate 114 to reset. At this time, the second abutting block 107 no longer clamps on the outer wall of the dovetail pin 210, making it possible to replace the extrusion block 101 conveniently.

[0024] During use, by designing the side walls of multiple extrusion blocks 101, the inner wall of the barrel-shaped structure formed by multiple extrusion blocks 101 is made elliptical. As a result, when extruding the bushing, the outer metal sleeve and the internal rubber of the bushing are extruded into an elliptical cross-section, enabling the bushing to have a greater deformation space in the major diameter direction of the elliptical hole, thereby optimizing the dynamic performance of the suspension system. And compared with a circular cross-section, it is easier to determine the installation direction of the bushing during installation. The parts not involved in this device are the same as or can be implemented using the prior art.

[0025] Although the embodiments of the present invention have been shown and described, this specific embodiment is only an interpretation of the present invention and is not a limitation of the invention. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions, and variations that do not contribute creatively to the embodiments according to their needs without departing from the principles and purposes of the present invention.

Claims

1. A hollow solid core bushing shrinking tool, comprising a tool body (1), characterized in that: The tooling body (1) comprises a plurality of groups of extrusion blocks (101), the plurality of groups of extrusion blocks (101) are arranged in a barrel shape, and the plurality of groups of extrusion blocks (101) are elliptical in shape. The bottom end of each group of extrusion blocks (101) is provided with a group of lower oil grooves (102), and the inner walls of the lower oil grooves (102) are slidably connected with two groups of first abutment blocks (103), and the two groups of first abutment blocks (103) extend to the outside of the extrusion blocks (101). The side walls of each group of the first abutment blocks (103) are fixedly connected with a group of return springs (104), and the return springs The end of the (104) is fixedly connected to the inner wall of the lower oil groove (102), the inner wall of the lower oil groove (102) is connected to two groups of connecting pipes (105), the inner wall of each group of the extrusion blocks (101) is provided with an upper oil groove (108) near the top, the side wall of the extrusion block (101) is provided with a dovetail groove (106), the upper oil groove (108) is connected to the inside of the dovetail groove (106), the inner wall of the upper oil groove (108) is slidably connected to two groups of second abutment blocks (107), and the top end of the connecting pipe (105) is connected to the upper oil groove (108); The outside of the tool body (1) is provided with a retracting mechanism (2), the retracting mechanism (2) comprising a plurality of groups of side panels (209), the side walls of each group of side panels (209) being respectively fixedly connected with a group of dovetail pins (210), the dovetail pins (210) being slidably sleeved on the inner walls of a group of dovetail grooves (106).

2. A hollow solid bushing shrinking tool according to claim 1, characterized in that: The top of each group of extrusion blocks is slidably connected to a group of upper sliders (109), the top of the upper sliders (109) is fixedly connected to a curling plate (110), the side walls of the upper sliders (109) are fixedly connected to an upper hydraulic rod (111), and the end of the upper hydraulic rod (111) is fixedly connected to the top of the extrusion block (101).

3. A hollow solid bushing shrinking tool according to claim 2, characterized in that: The bottom end of the upper hydraulic rod (111) is connected to a communication valve (112), and the bottom end of the communication valve (112) is connected to the interior of the upper oil tank (108).

4. A hollow solid bushing shrinking tool according to claim 3, characterized in that: A through hole (113) is provided on the inner wall of the connecting valve (112); a sealing plate (114) is slidably connected to the inside of the connecting valve (112); the sealing plate (114) is fitted above the through hole (113); two groups of pressure springs (115) are fixedly connected to the top of the sealing plate (114); and the top of the pressure spring (115) is fixedly connected to the inner wall of the connecting valve (112).

5. The hollow solid bushing shrinking tool according to claim 1, characterized in that: The retracting mechanism (2) further comprises an outer frame (201), the outer frame (201) being slidably mounted on the outer walls of the plurality of sets of side panels (209), the bottom ends of the side panels (209) being fixedly connected to guide blocks (211), and the bottom ends of the outer frame (201) being provided with a plurality of sets of sliding grooves that match the guide blocks (211).

6. A hollow solid bushing shrinking tool according to claim 5, characterized in that: A group of hooks (212) are respectively fixedly connected to the bottom ends of the multiple groups of guide blocks (211), and the outer walls of the multiple groups of hooks (212) are sleeved with elastic rings (213), and the elastic rings (213) are elastic metal rings with openings.

7. The hollow solid bushing shrinking tool according to claim 5, characterized in that: The side wall sliding sleeve of the outer frame (201) is provided with a plurality of groups of sliding rods (202), the bottom ends of the plurality of groups of sliding rods (202) are fixedly connected to a bottom plate (203), the inner wall fixed sleeve of the bottom plate (203) is provided with a lower hydraulic rod (205), the top end of the lower hydraulic rod (205) is fixedly connected to the bottom end of the outer frame (201).

8. The hollow solid bushing shrinking tool according to claim 7, characterized in that: The top end of each group of sliding rods (202) is fixedly connected to a group of sliding rods (204), and the outer wall sliding sleeve of the sliding rod (204) is provided with a rotating arm (206). The rotating arm (206) is provided with a sliding groove (207) at the contact position with the sliding rod (204), and the end of the rotating arm (206) is rotatably connected to a roller (208).

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