A mold for casting multiple polyurethane grooved wheel pieces

Abstract

This utility model discloses a mold for casting multiple polyurethane grooved wheel pieces, relating to the field of polyurethane molding mold technology. It includes a shell, comprising a semi-arc strip and two sets of side arc strips. The two sets of side arc strips are inserted into the sides of the shell. Inside the shell is a mold core assembly capable of injection molding polyurethane grooved wheel pieces. The mold core assembly includes a central shaft arranged along the axial direction of the shell. Multiple sets of spacers are sleeved on the outer walls of the side arc strips. Adjacent sets of spacers, together with the inner wall of the shell, form a mold cavity, and an arc-shaped component abuts against the shell. This utility model, through the design of the shell and mold core assembly, allows for the simultaneous casting of multiple wheel pieces in a single, burr-free molding process. It eliminates the need for CNC grooving of the wheel pieces, reducing processing costs. Furthermore, the two sets of side arc strips can be separated from the semi-arc strip, weakening the connection force between the outer wall of the wheel piece and the diameter of the shell (resistance between the wheel piece and the inner wall of the shell), making manual separation of the wheel pieces faster and easier.

Description

Technical Field

[0001] This utility model relates to the field of polyurethane molding mold technology, specifically a mold for casting multiple polyurethane grooved wheel pieces together. Background Technology

[0002] Polyurethane, short for polyurethane foam, is a polymer compound. There are two main types of polyurethane: polyester and polyether. They can be made into polyurethane plastics, polyurethane fibers, polyurethane rubber, and elastomers. Flexible polyurethane primarily has a thermoplastic linear structure, offering better stability, chemical resistance, resilience, and mechanical properties than PVC foam, while exhibiting less compression deformation. A polyurethane wheel is a roller consisting of a hub and a polyurethane outer shell.

[0003] Traditional polyurethane grooved wheel plates have the following defects in manufacturing:

[0004] 1. Polyurethane wheels need to be cast first, and then the outer groove is machined by CNC grooving, which involves many processes and low efficiency.

[0005] 2. Difficulty in ensuring accuracy: Multiple clamping operations can lead to concentricity deviations (requirement ≤0.05) and symmetry deviations on both sides, and burrs are easily generated on the surface.

[0006] 3. High cost: CNC grooving removes a large amount of material, resulting in waste of polyurethane raw materials; low production quantity per mold (e.g., low mold capacity of the original solution), and poor delivery efficiency. Utility Model Content

[0007] Therefore, the purpose of this utility model is to provide a mold for casting multiple polyurethane grooved wheel pieces to solve the technical problems mentioned in the background.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a mold for casting multiple polyurethane grooved wheel pieces, comprising a shell, wherein the shell comprises a semi-arc strip and two sets of side arc strips, the two sets of side arc strips being inserted into the two sides of the shell along the edge, and the shell being provided with a mold core assembly capable of injection molding polyurethane grooved wheel pieces.

[0009] The mold core assembly includes a central shaft arranged along the axial direction of its outer shell. Multiple sets of partitions are sleeved on the outer wall of the side arc strip. Adjacent sets of partitions form a mold cavity with the inner wall of the outer shell. An arc-shaped component abutting against the inner wall of the outer shell is provided in the mold cavity. End caps abutting against the partitions are provided on the outer wall of the central shaft near both ends. Nuts abutting against the end face of the end caps are provided at the ends of the central shaft.

[0010] As a preferred technical solution, the mold core assembly further includes side fittings sleeved at the ends of the two sets of side arc strips, with fan-shaped plates fixed to the inner curved surfaces of the two sets of side fittings, and washers sleeved on the outer walls of the central shaft at the axial positions of the two sets of fan-shaped plates.

[0011] As a preferred technical solution, the outer wall of the end of the central shaft is provided with an external thread that matches the nut, and the nut compression washer fits tightly with the end cap.

[0012] As a preferred technical solution, the bottom of the edge arc strip is provided with an inner lining strip extending into the semi-arc strip, and a strip-shaped groove is provided at the position where the semi-arc strip contacts the inner lining strip.

[0013] As a preferred technical solution, the side of the two sets of edge arc strips that are close to each other constitutes the pouring opening.

[0014] As a preferred technical solution, each set of mold cavities is provided with two sets of arc-shaped components, and the two sets of arc-shaped components are distributed symmetrically.

[0015] In summary, the present invention has the following main advantages:

[0016] This invention, through the design of the outer shell and mold core assembly, allows for the simultaneous casting of multiple wheel pieces, achieving one-time molding without burrs. It eliminates the need for CNC grooving of the wheel pieces, thereby reducing processing costs. Furthermore, the two sets of edge arc strips can be separated from the semi-arc strips, weakening the connection force between the outer wall of the wheel piece and the diameter of the outer shell (the wheel piece adheres to the inner wall of the outer shell), making manual mold separation of the wheel pieces time-saving and labor-saving. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is a diagram showing the unfolded end structure of the outer shell of this utility model;

[0020] Figure 4 This is a schematic diagram of the unfolded structure of the mold core of this utility model.

[0021] In the diagram: 100, outer shell; 110, semi-circular strip; 111, strip groove; 120, edge arc strip; 121, inner lining strip;

[0022] 200. Mold core assembly; 210. Central shaft; 220. Spacer; 230. Wheel piece; 240. Arc-shaped part; 250. End cap; 260. Washer; 270. Nut; 280. Sector plate; 281. Side assembly. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] The embodiments of this utility model will be described below based on its overall structure.

[0025] A mold for casting multiple polyurethane grooved wheel pieces, such as... Figures 1 to 4 As shown, it includes a housing 100, which includes a semi-arc strip 110 and two sets of side arc strips 120. The two sets of side arc strips 120 are inserted into the two sides of the housing 100. The housing 100 is provided with a mold core assembly 200 capable of injection molding polyurethane grooved wheel pieces.

[0026] The mold core assembly 200 includes a central shaft 210 arranged along the axial direction of its outer shell 100. Multiple sets of partitions 220 are sleeved on the outer wall of the side arc strip 120. Adjacent sets of partitions 220 form a mold cavity with the inner wall of the outer shell 100. An arc-shaped member 240 is provided in the mold cavity and abuts against the inner wall of the outer shell 100. An end cap 250 is provided on the outer wall of the central shaft 210 near both ends to abut against the partitions 220. A nut 270 is provided at the end of the central shaft 210 to abut against the end face of the end cap 250.

[0027] The mold core assembly 200 also includes side fittings 281 sleeved at the ends of the two sets of side arc strips 120. The curved inner walls of the two sets of side fittings 281 are fixed with fan-shaped plates 280, and the axial positions of the two sets of fan-shaped plates 280 are provided with washers 260 sleeved on the outer wall of the central shaft 210.

[0028] The wheel 230 is formed in the mold cavity; the side of the two sets of side arc strips 120 that are close to each other forms the pouring gate;

[0029] The outer wall of the end of the central shaft 210 is provided with an external thread that is compatible with the nut 270, and the nut 270 squeezes the washer 260 and fits tightly with the end cap 250;

[0030] Each mold cavity is equipped with two sets of arc-shaped parts 240, which are symmetrically distributed.

[0031] It is worth noting that the two sets of arc-shaped parts 240 are formed by turning metal bars (triangular cross-section), and are in the shape of a central pointed cone (center of the inner wall of the curved surface) in the mold cavity, and can be made into a wheel 230 with the mold cavity;

[0032] Polyurethane slurry is poured into the pouring port and moved along the axis of the outer shell 100. The polyurethane slurry will enter each mold cavity until it cools. At this time, the nuts at both ends of the central shaft 210 are manually rotated one by one to loosen and separate them. The washers 260 are pulled in two directions respectively, which can drive the side fittings 281 and the fan-shaped plate 280 to separate from the outer shell 100, releasing the locking effect between the semi-arc strip 110 and the side arc strip 120. At this time, the two sets of side arc strips 120 can be pulled upward to separate from the semi-arc strip 110, exposing the upper part of the mold core assembly 200. The left and right parts of the wheel 230 can be separated. At this time, external force can be applied along the axis of the outer shell 100 to open the mold core assembly 200. When the core component 200 is pulled out from the outer shell 100, the central shaft 210, partition 220, wheel 230, and arc-shaped part 240 are all removed together. Manually, the partition 220 can be pulled one by one along the direction of the central shaft 210, and the wheel 230 and arc-shaped part 240 can be pulled out. Finally, the arc-shaped part 240 can be removed from the curved outer wall of the wheel 230 to complete the demolding. This polyurethane groove wheel forming mold realizes multiple parts can be cast at one time, ensuring accuracy (concentricity ≤0.05, symmetrical on both sides, no burrs), and saving costs. It occupies the "material space that needs to be removed in the original CNC grooving", so that the outer groove can be directly formed during polyurethane casting, saving the subsequent grooving process.

[0033] Please refer to the figure carefully. The bottom of the edge arc strip 120 is provided with an inner lining strip 121 extending into the semi-arc strip 110. A strip groove 111 is provided at the position where the semi-arc strip 110 contacts the inner lining strip 121.

[0034] It can separate the side assembly 281 and the fan-shaped plate 280 from the outer shell (half-arc strip 110 and side arc strip 120), and can seal the connection between the side arc strip 120 and the half arc strip 110, thereby improving the quality of the manufactured wheel piece 230.

[0035] In use, polyurethane slurry is poured into the pouring port and moved along the axis of the outer shell 100. The polyurethane slurry will enter each mold cavity until it cools. At this time, the nuts at both ends of the central shaft 210 are manually rotated one by one to loosen and separate them. The washers 260 are pulled in two directions respectively, which can drive the side fittings 281 and the fan-shaped plate 280 to separate from the outer shell 100, releasing the locking effect between the semi-arc strip 110 and the side arc strip 120. At this time, the two sets of side arc strips 120 can be pulled upward to separate from the semi-arc strip 110, exposing the upper part of the mold core assembly 200. The left and right separation of the wheel piece 230 can be completed. At this time, external force can be applied along the axis of the outer shell 100. When the mold core assembly 200 is pulled out from the outer shell 100, the central shaft 210, partition 220, wheel 230, and arc-shaped part 240 are all removed together. Manually, the partition 220 can be pulled one by one along the direction of the central shaft 210, and the wheel 230 and arc-shaped part 240 can be pulled out. Finally, the arc-shaped part 240 can be removed from the curved outer wall of the wheel 230 to complete the demolding. This polyurethane groove wheel slab molding mold can achieve multiple parts in one casting, ensure accuracy (concentricity ≤0.05, symmetrical on both sides, no burrs), and save costs. It occupies the "material space that needs to be removed in the original CNC grooving", so that the outer groove can be directly formed during polyurethane casting, saving the subsequent grooving process.

[0036] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A mold for multi-piece polyurethane sump wheel segment combination transfer molding comprising a housing (100), characterized in that: The outer shell (100) includes a semi-arc strip (110) and two sets of side arc strips (120). The two sets of side arc strips (120) are inserted into the two sides of the outer shell (100). The outer shell (100) is provided with a mold core assembly (200) capable of injection molding polyurethane grooved wheel pieces. The mold core assembly (200) includes a central shaft (210) arranged along the axial direction of its outer shell (100). The outer wall of the side arc strip (120) is fitted with multiple sets of partitions (220). The partitions (220) and the inner wall of the outer shell (100) together form a mold cavity. The mold cavity is provided with an arc-shaped member (240) that abuts against the inner wall of the outer shell (100). The outer wall of the central shaft (210) near both ends is provided with end caps (250) that abut against the partitions (220). The end of the central shaft (210) is provided with a nut (270) that abuts against the end face of the end cap (250).

2. A multi-piece polyurethane sump wheel segment assembly cast molding die according to claim 1, wherein: The mold core assembly (200) also includes side fittings (281) sleeved on the ends of the two sets of side arc strips (120). The inner curved walls of the two sets of side fittings (281) are fixed with fan-shaped plates (280), and the axial positions of the two sets of fan-shaped plates (280) are provided with washers (260) sleeved on the outer wall of the central shaft (210).

3. A multi-piece polyurethane sump wheel segment assembly cast mold according to claim 2, wherein: The outer wall of the end of the central shaft (210) is provided with an external thread that is compatible with the nut (270), and the nut (270) squeezes the washer (260) and the end cap (250) to fit tightly together.

4. A multi-piece polyurethane sump wheel segment assembly cast mold according to claim 1, wherein: The bottom of the edge arc strip (120) is provided with an inner lining strip (121) extending into the semi-arc strip (110), and a strip groove (111) is provided at the position where the semi-arc strip (110) contacts the inner lining strip (121).

5. A multi-piece polyurethane sump wheel segment assembly cast mold according to claim 1, wherein: The two sets of edge arc strips (120) with their sides close to each other form a pouring opening.

6. A multi-piece polyurethane sump wheel segment assembly cast mold according to claim 1, wherein: Each set of the mold cavity is provided with two sets of arc-shaped parts (240), and the two sets of arc-shaped parts (240) are distributed symmetrically.

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