An apparatus for forming an electrically conductive contact for a self-lubricating bearing
By punching and stretching protruding contacts on the surface of self-lubricating bearings using conductive contact forming equipment, the problem of poor conductivity in traditional methods is solved, and stable conductivity and efficient production of composite material bearings are achieved.
Patent Information
- Application Number
- CN202521566997.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-24
- Estimated Expiration
- 2035-07-25
AI Technical Summary
Traditional methods are difficult to completely remove coating materials when manufacturing self-lubricating bearings with low composite strength and thin thickness, resulting in poor conductivity and failing to meet the requirements of automotive electrophoretic coating.
The conductive contact forming equipment uses a pin assembly to punch holes on the bearing surface and then uses a stretching part to form raised contacts, achieving stable conductivity. It also improves production efficiency by forming multiple contacts in one step.
This achieves stable conductivity in self-lubricating bearings, avoids excessive processing time caused by multiple steps, and improves production efficiency and product quality.
Smart Images
Figure CN224542873U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of self-lubricating bearings, and in particular to a conductive contact forming device for self-lubricating bearings. Background Technology
[0002] A self-lubricating sliding bearing is a mechanical component that has a self-lubricating function, requiring no additional lubricating oil or grease. Its working principle relies on the inherent properties of the bearing material itself for lubrication; typically, solid lubricants such as graphite or molybdenum disulfide are pre-added to the material. These lubricants form a lubricating film during bearing operation, effectively reducing friction and extending the bearing's service life.
[0003] Self-lubricating bearings, typically used as connectors between bores and shafts in automotive door hinge assembly, require conductivity to meet the requirements of automotive electrophoretic coating. Traditional methods improve the conductivity of self-lubricating polymer coatings through formulation design, but this often fails to achieve low resistance, resulting in poor conductivity and quality risks during the electrophoretic coating process.
[0004] Existing technologies typically achieve hole-shaft conductivity by removing the surface coating material during bearing manufacturing, exposing the metal layer and allowing it to directly contact the shaft, thus obtaining lower resistance. This approach is widely used in steel-based composite bearings with high overall strength and can meet the requirements of electrophoretic coating. However, when the composite material used in the bearing has low overall strength and is thin, incomplete or missed removal of the coating material can easily occur during the removal process, resulting in the bearing failing to achieve its conductive function after assembly. Summary of the Invention
[0005] In view of this, the present invention provides a conductive contact forming device for a self-lubricating bearing to solve the above-mentioned technical problems.
[0006] A conductive contact forming device for a self-lubricating bearing includes an upper mold assembly, a lower mold assembly spaced apart from the upper mold assembly, and an ejector pin assembly disposed on the lower mold assembly. The upper mold assembly includes an upper mold base, a pad disposed on the upper mold base, and two ejector pins disposed on the pad. Each ejector pin has a downward pressing slope at its free end away from the upper mold base. The downward pressing slopes of both ejector pins are located on opposite sides. The lower mold assembly includes a lower mold base, a positioning plate disposed on the lower mold base, and a slider assembly disposed on the lower mold base. The slider assembly consists of two spaced-apart sliders, located on opposite sides of the ejector pin assembly and arranged axially symmetrically about the ejector pin. Each slider in the slider assembly has a first inclined surface on the side opposite to the two sliders and a second inclined surface on the side opposite to the two sliders. The first inclined surface abuts against the downward pressing slope of the ejector pin. The ejector assembly includes an upper blade plate disposed within the positioning plate, a stop block disposed in the middle of the slider assembly, and multiple ejector pins disposed within the stop block. The stop block is positioned between two sliders of the slider assembly, with two abutting inclined surfaces on each side, abutting against the second inclined surfaces of the two sliders respectively. The ejector pins are arranged and fixed on the stop block. Each ejector pin includes a punch located at its free end and a stretching portion disposed on one side of the punch. The stretching portion is located on the side of the punch away from the ejector pin's punching direction. The diameter of the stretching portion is larger than the diameter of the punch.
[0007] Furthermore, the upper mold assembly also includes a wedge block disposed on the pad.
[0008] Furthermore, both of the top pins are columnar structures, parallel to each other and spaced apart.
[0009] Furthermore, the ejector pin is vertically fixed to the upper mold base and extends toward the lower mold assembly.
[0010] Furthermore, the lower mold assembly also includes a recessed template disposed on the lower mold base.
[0011] Furthermore, a horizontal guide rail is also provided along the direction in which the two sliders are arranged.
[0012] Furthermore, a supporting spring is provided between the two sliders. Without external force, the springs are pushed and pushed away from each other.
[0013] Furthermore, the upper blade is fixed to the positioning plate, and the upper blade is provided with a plurality of punches, the number and position of which correspond to the ejector pin.
[0014] Compared with the prior art, the conductive contact forming equipment for self-lubricating bearings provided by this utility model, by setting the ejector pin, punching holes on the product surface with the punch, and then stretching the edge of the punched hole by the stretching part, makes the edge protrude to form a contact. This enables the contact to protrude effectively, thereby achieving stable conductivity. Moreover, the product is formed in one step, avoiding the long processing time caused by multiple processes. At the same time, multiple contact stamping and stretching operations can be performed at one time, resulting in high production efficiency. Attached Figure Description
[0015] Figure 1 A schematic diagram of the structure of a conductive contact forming device for a self-lubricating bearing provided by this utility model.
[0016] Figure 2 for Figure 1 A schematic diagram of the structure of the conductive contact forming equipment for self-lubricating bearings.
[0017] Figure 3 for Figure 1 A schematic diagram of the ejector pin assembly in the conductive contact forming equipment for self-lubricating bearings. Detailed Implementation
[0018] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.
[0019] like Figures 1 to 3 The diagram shown is a structural schematic of the conductive contact forming device for a self-lubricating bearing provided by this utility model. The conductive contact forming device for the self-lubricating bearing includes an upper mold assembly 10, a lower mold assembly 20 spaced apart from the upper mold assembly, and an ejector pin assembly 30 disposed on the lower mold assembly 20. It is conceivable that the conductive contact forming device for the self-lubricating bearing also includes other functional modules such as mold cores, control systems, etc., which are technologies well known to those skilled in the art and will not be described in detail here.
[0020] The upper mold assembly 10 includes an upper mold base 11, a pad 12 disposed on the upper mold base 11, a wedge block 13 disposed on the pad 12, and two ejector pins 14 disposed on the pad 12.
[0021] The upper die holder 11 is a plate-shaped part of the punch die that is far from the ground. It is set close to the press slide and is fixed to the press slide through the die handle or directly.
[0022] The pad 12 is an auxiliary tool in the stamping die, usually made of steel or plastic, used to support and protect the die, and also serves as a positioning tool.
[0023] The wedge 13 is a part used to adjust the clearance in the stamping die. By adjusting its height or angle, it can correct the die offset in time and ensure the normal operation of the die. It can not only prevent the die offset, ensure the normal operation of the die, adjust the die height and strengthen the die rigidity, but also improve the stability and durability of the stamping die, improve production efficiency and product quality, and reduce production costs and pressure.
[0024] The ejector pins 14 are vertically fixed to the upper mold base 11 and extend toward the lower mold assembly 20. Both ejector pins 14 can be columnar structures, parallel to each other and spaced apart. The free end of each ejector pin 14 away from the upper mold base 11 is also provided with a downward pressing slope 141. The downward pressing slopes 141 of both ejector pins 14 are located on one side facing each other, for abutting and pushing the slider assembly 24 described below.
[0025] The lower mold assembly 20 includes a lower mold base 21, a concave mold plate 22 disposed on the lower mold base 21, a positioning plate 23 disposed on the lower mold base 21, and a slider assembly 24 disposed on the lower mold base 21.
[0026] The lower die base 21 is a plate-shaped part on the bottom surface of the lower die, which is directly fixed to the press worktable or pad during operation.
[0027] The concave die 22 is a concave working part in the stamping die that directly forms the stamped part, that is, a part whose inner shape is the working surface.
[0028] The positioning plate 23 directs the correct positioning and relative position of the upper and lower dies in the die assembly. During die processing, the positioning plate, as part of the die, ensures more precise and stable opening and closing of the die, significantly impacting its accuracy, stability, and production efficiency. A polyurethane layer can also be installed between the positioning plate 23 and the die plate 22 to provide cushioning protection, improve blanking accuracy, extend die life, reduce direct collisions between the die and the workpiece, and lower the risk of die damage.
[0029] The slider assembly 24 consists of two spaced-apart sliders, located on opposite sides of the ejector pin assembly 30 and arranged symmetrically about the ejector pin 33. Each slider in the slider assembly 24 has a first inclined surface 241 on the side where the two sliders are separated and a second inclined surface 242 on the side where the two sliders are opposite. A horizontal slide rail is also provided along the arrangement direction of the two sliders to allow for slider movement. A spring is also provided between the two sliders to push and move them away from each other without external force.
[0030] The first inclined surface 241 abuts against the downward pressing inclined surface 141 of the ejector pin 14. It can be imagined that when the upper mold assembly 10 pushes the ejector pin 14 to move, due to the mutual abutment of the inclined surfaces, the slider will be pushed to move horizontally along the slide rail. Specifically, the two sliders will move closer to each other.
[0031] The second inclined surface 242 abuts against the corresponding structure of the ejector pin assembly 30 to achieve its vertical movement, which will be described in detail below with reference to the specific structure. The first inclined surface 241 and the second inclined surface 242 may be arranged symmetrically on the slider assembly 24.
[0032] It is conceivable that the upper mold assembly 10 and the lower mold assembly 20 also include other functional modules, such as guide pillars, springs, upper and lower clamping plates, etc., which are existing technologies of the mold itself, and will not be listed and explained here.
[0033] The ejector pin assembly 30 includes an upper blade plate 31 disposed within the positioning plate 23, a stop block 32 disposed in the middle of the slider assembly 24, and a plurality of ejector pins 33 disposed within the stop block 32.
[0034] The upper blade 31 is fixed to the positioning plate 23 so that it presses against the product during the stamping process and forms a punch under the pressure of the ejector pin. The upper blade 31 is provided with a plurality of punches, the number and position of which correspond to the ejector pin 33 so as to avoid the tip of the ejector pin 33 during stamping.
[0035] The abutting block 32 is disposed between the two sliders of the slider assembly 24, and two abutting inclined surfaces 321 are respectively provided on both sides, which abut against the second inclined surfaces 242 of the two sliders respectively. When the two sliders approach each other under the push of the ejector pin 14, the abutting block 32 is lifted under the abutting action of the inclined surfaces, which drives the ejector pin 33 to punch holes on the product surface.
[0036] The ejector pins 33 are arranged and fixed on the abutment block 32. The arrangement direction and shape can be set according to the arrangement direction and shape of the contacts stamped on the product surface as needed. Each ejector pin 33 includes a punch 331 located on the free end and a stretching part 332 disposed on one side of the punch 331.
[0037] The punch 331 is a metal part mounted on the stamping die. It is used to directly contact the material, causing the material to deform and cut. The punch 331 interacts with the punch hole on the upper blade 31 to punch a hole on the product surface.
[0038] The stretching portion 332 is disposed on the side of the punch 331 away from the punching direction of the ejector pin 33, and the diameter of the stretching portion 332 is larger than the diameter of the punch 331.
[0039] During punching, the product is placed between the positioning plate 23 and the concave template 22. The upper die assembly 10 is pressed down, and the ejector pin 14 pushes the two sliders of the slider assembly 24 closer to each other and squeezes the abutment block 32, so that the punch 331 punches an opening on the surface of the product. Then, it is punched again, and the stretching part 332 abuts and stretches the edge of the punch, so that the edge of the punch protrudes and forms a contact point.
[0040] Compared with the prior art, the conductive contact forming equipment for self-lubricating bearings provided by this utility model, by setting the ejector pin 33, punching holes on the product surface through the punch 331, and then stretching the edge of the punched hole by the stretching part 332, makes the edge protrude to form a contact. This enables the contact to protrude effectively, thereby achieving stable conductivity. Moreover, the product is formed in one step, avoiding the long processing time caused by multiple processes. At the same time, multiple contact stamping and stretching operations can be performed at one time, resulting in high production efficiency.
[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.
Claims
1. A conductive contact forming device for a self-lubricating bearing, characterized in that: The conductive contact forming device for the self-lubricating bearing includes an upper mold assembly, a lower mold assembly spaced apart from the upper mold assembly, and an ejector pin assembly disposed on the lower mold assembly. The upper mold assembly includes an upper mold base, a pad disposed on the upper mold base, and two ejector pins disposed on the pad. Each ejector pin has a downward pressing slope at its free end away from the upper mold base. The downward pressing slopes of both ejector pins are located on opposite sides. The lower mold assembly includes a lower mold base, a positioning plate disposed on the lower mold base, and a slider assembly disposed on the lower mold base. The slider assembly consists of two spaced-apart sliders, located on opposite sides of the ejector pin assembly and arranged axially symmetrically about the ejector pin. Each slider of the slider assembly... Each component is provided with a first inclined surface located on the side where the two sliders are separated, and a second inclined surface located on the side where the two sliders are opposite. The first inclined surface abuts against the downward pressing inclined surface of the ejector pin. The ejector pin assembly includes an upper blade plate disposed in the positioning plate, a stop block disposed in the middle of the slider assembly, and a plurality of ejector pins disposed in the stop block. The stop block is disposed between the two sliders of the slider assembly, and two stop inclined surfaces are respectively disposed on both sides, which abut against the second inclined surfaces of the two sliders. The ejector pins are arranged and fixed on the stop block. Each ejector pin includes a punch located on the free end and a stretching part disposed on one side of the punch. The stretching part is disposed on the side of the punch away from the ejector pin pressing direction, and the diameter of the stretching part is larger than the diameter of the punch.
2. The conductive contact forming equipment for self-lubricating bearings as described in claim 1, characterized in that: The upper mold assembly also includes a wedge block disposed on the pad.
3. The conductive contact forming equipment for self-lubricating bearings as described in claim 1, characterized in that: Both of the top pins are columnar structures, parallel to each other and spaced apart.
4. The conductive contact forming equipment for self-lubricating bearings as described in claim 1, characterized in that: The ejector pin is vertically fixed to the upper mold base and extends toward the lower mold assembly.
5. The conductive contact forming equipment for self-lubricating bearings as described in claim 1, characterized in that: The lower mold assembly also includes a concave template disposed on the lower mold base.
6. The conductive contact forming equipment for self-lubricating bearings as described in claim 1, characterized in that: A horizontal slide rail is also set along the direction in which the two sliders are arranged.
7. The conductive contact forming equipment for self-lubricating bearings as described in claim 1, characterized in that: A spring is installed between the two sliders. Without external force, the spring pushes the slider away from the other two.
8. The conductive contact forming equipment for self-lubricating bearings as described in claim 1, characterized in that: The upper blade is fixed to the positioning plate, and the upper blade is provided with a plurality of punches, the number and position of which correspond to the ejector pin.