High-concentricity shaft sleeve die
By designing a high concentricity bushing mold, using the combination of limiting grooves and limiting pins, along with guide components and ejector pin components, the problem of ensuring bushing concentricity was solved, resulting in material cost savings and improved production efficiency.
Patent Information
- Application Number
- CN202422878248.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing technologies make it difficult to ensure high concentricity between the first and second bushing parts during machining, resulting in large machining errors, high material costs, and low production efficiency.
A high concentricity bushing mold was designed, including an upper mold fixing plate, a runner plate, a front template, a rear template, and a lower mold fixing plate. It is equipped with a limiting groove, a limiting post, a guide assembly, and an ejector pin assembly. The limiting groove and the limiting post cooperate to achieve high concentricity injection molding. The use of the guide assembly and the ejector pin assembly ensures stable demolding of the product.
It achieves high concentricity bushing molding, saves material costs, improves production efficiency, and ensures stable demolding of products through the design of guide components and ejector pin components.
Smart Images
Figure CN223834963U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, and in particular to a high concentricity bushing mold. Background Technology
[0002] A mold is a tool used to create shaped objects. This tool consists of various parts, and different molds have different components. It is a tool that uses external force to shape a blank into a part with a specific shape and size. Molds are widely used in blanking, die forging, cold heading, extrusion, powder metallurgy pressing, pressure casting, and compression or injection molding of engineering plastics, rubber, and ceramics.
[0003] like Figure 6 The bushing 100 shown mainly includes a first sleeve portion 110 coaxially arranged and a second sleeve portion 120 integrally formed with the first sleeve portion 110. The diameter of the first sleeve portion 110 is smaller than the diameter of the second sleeve portion 120. A retaining ring portion 130 is provided at the end of the first sleeve portion 110. When forming the bushing, it is necessary to ensure the high concentricity of the first sleeve portion 110 and the second sleeve portion 120. The error of wire cutting process is too large. Coordinate grinding process is used to improve it. In the existing technology, the parting surface of the front and rear molds is mainly on the outer circumferential surface of the second sleeve portion. It is difficult to ensure the concentricity of the outer edge circumferential surface and the inner edge circumferential surface in this processing method. The existing processing of the inner parts of the bushing mainly uses wire cutting, which has a large error. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a high concentricity bushing mold that saves material costs and improves molding stability.
[0005] The technical solution of this utility model is as follows: a high concentricity bushing mold, comprising, from top to bottom, an upper mold fixing plate, a runner plate, a front mold plate, a rear mold plate, and a lower mold fixing plate. The front mold plate contains a front mold core, and the rear mold plate contains a rear mold core corresponding to the front mold core. An ejector pin assembly is provided between the rear mold plate and the lower mold fixing plate. A gate is provided on the upper mold fixing plate. A hot runner assembly communicating with the gate is provided in the runner plate. A plurality of rectangular limiting grooves are provided in the rear mold core. A plurality of first through holes are arranged annularly in the rectangular limiting grooves of the rear mold core. A limiting connecting block is provided in the rectangular limiting groove. A second through hole communicating with the first through hole is provided in the limiting connecting block. A limiting post is provided at the end of the ejector pin assembly. The top of the limiting post extends through the second through hole and out of the limiting connecting block. The contour formed between the contact surfaces of the front mold core and the rear mold core is a partial contour of the bushing.
[0006] As can be seen from the above scheme, the gate is used to pour the plastic melt into the hot runner assembly, the hot runner assembly is used to realize the simultaneous injection molding of several products between the front mold core and the rear mold core, and the ejector assembly is used to eject the injection molded products after the mold is opened. This utility model uses a bushing mold to injection mold a bushing with high concentricity, which saves material costs and has high production efficiency.
[0007] The limiting post includes a connecting portion and a limiting portion coaxially arranged with the connecting portion. The diameter of the limiting portion is smaller than the diameter of the connecting portion and smaller than the diameter of the second through hole. The height of the limiting portion is greater than the height by which the limiting post extends out of the limiting connecting block. Therefore, the smaller diameter of the limiting portion compared to the second through hole facilitates the entry of the molten plastic.
[0008] A guide assembly is provided between the runner plate and the rear template. The guide assembly includes a guide post and a guide sleeve. The guide sleeve is fitted inside the guide post. The guide post is disposed on the rear template, and the guide sleeve is disposed on the front template. Therefore, the guide assembly is used to guide the front template and the rear template during mold opening and closing.
[0009] The hot runner assembly includes a manifold, a plurality of first hot injection nozzles disposed at the bottom of the manifold, and a plurality of second hot injection nozzles disposed at the bottom of the first hot injection nozzles. The manifold is disposed within the runner plate, and a heating wire is embedded in the surface of the manifold. A manifold channel communicating with the first hot injection nozzles is disposed within the manifold. The second hot injection nozzles are disposed within the front mold core and are correspondingly disposed above the limiting post. Thus, the manifold is used to divert the molten plastic from the gate into the plurality of first hot injection nozzles. The heating wires are used to keep the manifold warm, preventing the molten plastic from cooling and causing obstruction within the manifold. The second hot injection nozzles inject downwards above the limiting post, injecting into the groove between the front and rear mold cores to achieve the injection molding of the sleeve.
[0010] The ejector pin assembly includes an ejector pin pad, an ejector pin fixing plate connected above the ejector pin pad, an ejector pin group, and a reset rod. The ejector pin group includes a plurality of ejector pins disposed on the ejector pin fixing plate. The ejector pins are inserted upward into the rear mold core. The reset rod is disposed between the rear mold core and the ejector pin fixing plate, and a reset spring is sleeved on the reset rod. Therefore, the ejector pin fixing plate is used to fix the ejector pins, the reset rod is reset by the reset spring, and the ejector pins are used to separate and remove the product during mold opening.
[0011] A gate sleeve is fitted over the outside of the gate. Therefore, the gate sleeve is used for positioning by the injection molding machine during injection molding.
[0012] The second injection nozzle adopts an open injection nozzle head, and an injection port is provided at the bottom of the second injection nozzle.
[0013] Both the front mold core and the rear mold core are provided with cooling channels. Therefore, coolant is injected into the cooling channels to cool and mold the injection-molded product. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a partial structural schematic diagram of the present invention;
[0016] Figure 3 This is a partial structural schematic diagram of the present invention;
[0017] Figure 4 This is a schematic diagram of the hot runner assembly;
[0018] Figure 5 This is a schematic diagram of the structure of the rear mold core;
[0019] Figure 6 This is a schematic diagram of the mechanism of the bushing product to be injection molded. Detailed Implementation
[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0021] like Figures 1 to 6 As shown, this utility model is a high concentricity bushing mold, which includes, from top to bottom, an upper mold fixing plate 1, a runner plate 2, a front mold plate 3, a rear mold plate 4, and a lower mold fixing plate 5. The front mold plate 3 contains a front mold core 6, and the rear mold plate 4 contains a rear mold core 7 corresponding to the front mold core 6. An ejector pin assembly 8 is provided between the rear mold plate 4 and the lower mold fixing plate 5. A gate 10 is provided on the upper mold fixing plate 1, and a gate sleeve is fitted around the gate 10. A hot runner assembly 9 communicating with the gate 10 is provided inside the runner plate 2. The mold core 7 is provided with a plurality of rectangular limiting grooves 70. The rear mold core 7 is provided with a plurality of first through holes 701 arranged in a ring within the rectangular limiting grooves 70. A limiting connecting block 71 is provided within the rectangular limiting grooves 70. A second through hole 711 communicating with the first through hole 701 is provided within the limiting connecting block 71. A limiting post 72 is provided at the end of the ejector pin assembly 8. The top end of the limiting post 72 extends out of the limiting connecting block 71 through the second through hole 711. The contour formed between the contact surfaces of the front mold core 6 and the rear mold core 7 is a partial contour of the sleeve.
[0022] In this embodiment, cooling channels are provided in the front mold core 6 and the rear mold core 7. Coolant is injected into the cooling channels to cool and achieve the cooling and molding of the injection molded product. Four rectangular limiting grooves 70 are provided, and six limiting posts 72 are arranged in a ring. This utility model can injection mold 24 sleeves at one time. The sleeve is marked as 100 in the attached drawing. The contour formed between the contact surfaces of the front mold core 6 and the rear mold core 7 is formed into a first sleeve portion 110 on the outer circumferential surface of the limiting post 72. A retaining ring portion 130 is formed at the end of the limiting post 72. The sprue sleeve is arranged in a ring and is concentric with the sprue 10 for positioning. The diameter of the limiting post 72 is larger than the inner diameter of the retaining ring portion 130, which facilitates the ejection assembly to eject the sleeve 100.
[0023] The limiting post 72 includes a connecting portion 721 and a limiting portion 722 coaxially disposed with the connecting portion 721. The diameter of the limiting portion 722 is smaller than the diameter of the connecting portion 721, and the diameter of the limiting portion 722 is smaller than the diameter of the second through hole 711. The height of the limiting portion 722 is greater than the height of the limiting post 72 extending out of the limiting connecting block 71. In this embodiment, a gap is provided between the limiting portion 722 and the second through hole 711. During injection molding, the molten plastic flows into this gap to form the second sleeve 120.
[0024] A guide assembly is provided between the flow channel plate 2 and the rear template 4. The guide assembly includes a guide post 11 and a guide sleeve 12. The guide sleeve 12 is fitted inside the guide post 11. The guide post 11 is disposed on the rear template 4, and the guide sleeve 12 is disposed on the front template 3. In this embodiment, the guide assembly is disposed on the outside of the front mold core 6 and the rear mold core 7. The lower mold fixing plate 5 is provided with mold corners 13 on both sides of the ejector pin assembly 8. The bottom of the guide post 11 is fixed on the mold corner 13, and the end extends upward to connect with the rear template 4 and the front template 3. The guide sleeve 12 is connected with the front mold core 6.
[0025] The hot runner assembly 9 includes a manifold 91, a plurality of first hot injection nozzles 92 disposed at the bottom of the manifold 91, and a plurality of second hot injection nozzles 93 disposed at the bottom of the first hot injection nozzles 92. The manifold 91 is disposed within the runner plate 2, and a heating wire 94 is embedded on the surface of the manifold 91. A manifold channel communicating with the first hot injection nozzles 92 is disposed within the manifold 91. The second hot injection nozzles are disposed within the front mold core 6, and the second hot injection nozzles 93 are correspondingly disposed above the limiting post 72. The second hot injection nozzles 93 are open-type hot injection nozzle heads, and an injection port is provided at the bottom end of the second hot injection nozzles 93. In this embodiment, the upper surface of the manifold 91 communicates with the gate 10, and the bottom surface communicates with the first hot injection nozzles 92. The heating wire 94 is an electric heating wire. A main feed port communicating with the gate 10 is provided at the end of the runner plate 2. The main feed port is connected to the first hot injection nozzles 92 for feeding molten plastic.
[0026] The ejector assembly 8 includes an ejector pad 81, an ejector fixing plate 82 connected above the ejector pad 81, an ejector group, and a reset rod 83. The ejector group includes a plurality of ejector pins 84 disposed on the ejector fixing plate 82. The ejector pins 84 are inserted upward into the rear mold core 7. The reset rod 83 is disposed between the rear mold plate 4 and the ejector fixing plate 82. A reset spring 85 is sleeved on the reset rod 83.
[0027] The working process of this utility model is as follows: the front mold plate 3 and the rear mold plate 4 are closed, the upper mold plate 13 and the lower mold plate 21 are closed, the plastic melt is poured in through the gate 10, the plastic melt is diverted through the diversion channel in the manifold 91, and the plastic is injected into multiple products simultaneously through the second injection hot nozzle 92. After a period of cooling, the sleeve 100 is formed, the front mold plate 3 and the front mold core 6 move upward away from the rear mold core 7 to separate from the mold, and the ejector pin 84 ejects the formed sleeve product through the limiting post 72 to achieve the demolding of the sleeve product.
[0028] Finally, it should be emphasized that the above description is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A high concentricity bushing mold, comprising, from top to bottom, an upper mold fixing plate (1), a flow channel plate (2), a front mold plate (3), a rear mold plate (4), and a lower mold fixing plate (5), wherein a front mold core (6) is provided in the front mold plate (3), and a rear mold core (7) corresponding to the front mold core (6) is provided in the rear mold plate (4), characterized in that: An ejector assembly (8) is provided between the rear mold plate (4) and the lower mold fixing plate (5). A gate (10) is provided on the upper mold fixing plate (1). A hot runner assembly (9) communicating with the gate (10) is provided in the runner plate (2). A plurality of rectangular limiting grooves (70) are provided in the rear mold core (7). A plurality of first through holes (701) are provided in the rectangular limiting grooves (70) in a ring. A limiting connecting block (71) is provided in the rectangular limiting grooves (70). A second through hole (711) communicating with the first through hole (701) is provided in the limiting connecting block (71). A limiting post (72) is provided at the end of the ejector assembly (8). The top of the limiting post (72) extends out of the limiting connecting block (71) through the second through hole (711). The contour formed between the contact surfaces of the front mold core (6) and the rear mold core (7) is a partial contour of the sleeve.
2. The high concentricity bushing mold according to claim 1, characterized in that: The limiting post (72) includes a connecting part (721) and a limiting part (722) coaxially disposed with the connecting part (721). The diameter of the limiting part (722) is smaller than the diameter of the connecting part (721), the diameter of the limiting part (722) is smaller than the diameter of the second through hole (711), and the height of the limiting part (722) is greater than the height of the limiting post (72) extending out of the limiting connecting block (71).
3. The high concentricity bushing mold according to claim 1, characterized in that: A guide assembly is provided between the flow channel plate (2) and the rear template (4). The guide assembly includes a guide post (11) and a guide sleeve (12). The guide sleeve (12) is fitted inside the guide post (11). The guide post (11) is set on the rear template (4), and the guide sleeve (12) is set on the front template (3).
4. The high concentricity bushing mold according to claim 1, characterized in that: The hot runner assembly (9) includes a manifold (91), a plurality of first hot nozzles (92) disposed at the bottom of the manifold (91), and a plurality of second hot nozzles (93) disposed at the bottom of the first hot nozzles (92). The manifold (91) is disposed in the runner plate (2), and a heating wire (94) is embedded on the surface of the manifold (91). The manifold (91) is provided with a manifold channel communicating with the first hot nozzles (92). The second hot nozzles are disposed in the front mold core (6), and the second hot nozzles (93) are correspondingly disposed above the limiting post (72).
5. A high concentricity bushing mold according to claim 1, characterized in that: The ejector assembly (8) includes an ejector pad (81), an ejector fixing plate (82) connected above the ejector pad (81), an ejector group, and a reset rod (83). The ejector group includes a plurality of ejector pins (84) disposed on the ejector fixing plate (82). The ejector pins (84) are inserted upward into the rear mold core (7). The reset rod (83) is disposed between the rear mold plate (4) and the ejector fixing plate (82). A reset spring (85) is sleeved on the reset rod (83).
6. A high concentricity bushing mold according to claim 1, characterized in that: A gate sleeve is provided on the outside of the gate (10).
7. A high concentricity bushing mold according to claim 4, characterized in that: The second injection nozzle (93) adopts an open injection nozzle head, and the bottom end of the second injection nozzle (93) is provided with an injection port.
8. A high concentricity bushing mold according to claim 1, characterized in that: Cooling channels are provided in both the front mold core (6) and the rear mold core (7).