Low-hardness rubber roller forming mold for optimizing parting line

Abstract

The utility model relates to the technical field of dies, in particular to a low-hardness rubber roller forming die with an optimized parting line, which comprises an upper die plate, a lower die plate and a material extruding plate, a plurality of rubber roller cavities are uniformly distributed between the upper die plate and the lower die plate, a sleeve for forming the surface of a rubber roller is positioned and placed in each rubber roller cavity, and the material extruding plate is arranged between the upper die plate and the lower die plate. Shaft fixing grooves used for fixing the shaft cores are formed in the positions, corresponding to the positions except the two ends of each sleeve, between the upper die plate and the lower die plate. A material groove used for containing rubber materials is formed in the upper die plate, the material extruding plate is arranged on the upper die plate and movably matched with the upper die plate, and a rubber inlet runner extending into a rubber roller cavity is formed in the bottom of the material groove. The molded rubber roller has no parting line, so that the phenomenon of edge cracking is avoided, and the grinding procedure is omitted; and the rubber roller cavity is put into the mold for molding by using the sleeve, so that interchangeability is realized, the demolding efficiency is high, and the product is poor.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a low-hardness rubber roller forming mold with an optimized parting line. Background Art

[0002] In modern industrial production, low-hardness rubber rollers, such as silicone or rubber, are widely used in various fields due to their unique properties. These rollers are typically required to possess excellent elasticity, wear resistance, corrosion resistance, and low compression set to meet the requirements of various operating conditions. Currently, the production of low-hardness rubber rollers generally uses vulcanization molds for vulcanization molding. Vulcanization molding is a process that cross-links unvulcanized rubber or silicone materials under specific temperature, pressure, and time conditions to produce rubber products with specific shapes and properties.

[0003] However, existing vulcanization molds present some significant problems during the low-hardness rubber roller molding process. First, because the vulcanization mold itself has a cavity surface structure, edge bursting is prone to occur during rubber roller molding. This is mainly because the low-hardness rubber roller material will expand and contract in volume as the temperature and pressure change during the vulcanization process. When the rubber roller material contacts the mold cavity surface, due to the limitations of the cavity surface, the stress on the rubber roller material during expansion and contraction is uneven, which easily causes stress concentration at the edge, resulting in edge bursting. Edge bursting not only affects the appearance quality of the rubber roller, but may also reduce the performance and life of the rubber roller. Secondly, the problem of poor grinding at the parting line is also quite prominent. The parting line is the dividing line between the upper and lower parts of the mold formed when the mold is closed. During the molding process of low-hardness rubber rollers, the rubber roller material at the parting line is prone to burrs and flash, which requires grinding. However, due to the softness and elasticity of low-hardness rubber roller material, grinding at the parting line is more difficult. Traditional grinding methods often cannot ensure the flatness and smoothness of the parting line, and are prone to poor grinding. This not only affects the appearance quality of the rubber roller, but also may cause the rubber roller to stick and jump during use, affecting the normal operation of the equipment. In addition, existing vulcanization molds for the molding of low-hardness rubber rollers also have problems such as low production efficiency and short mold life. Due to the existence of problems such as burrs and poor grinding at the parting line, the rubber roller needs to be repaired and processed multiple times, which not only increases production costs but also reduces production efficiency. At the same time, frequent repairs and processing will cause certain damage to the mold and shorten the mold life.

[0004] In summary, existing vulcanization molds suffer from issues such as edge bursting, poor parting line grinding, low production efficiency, and short mold life during the low-hardness rubber roller forming process, which seriously impact the quality and production efficiency of low-hardness rubber roller products. Therefore, developing a low-hardness rubber roller forming mold with an optimized parting line has important practical significance and application value. Utility Model Content

[0005] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0006] A low-hardness rubber roller forming mold with an optimized parting line includes an upper template, a lower template and an extrusion plate. A plurality of evenly distributed rubber roller cavities are provided between the upper template and the lower template. A sleeve for forming the surface of the rubber roller is positioned in each rubber roller cavity, and shaft fixing grooves for fixing the shaft core are provided at positions other than the two ends of each sleeve between the upper template and the lower template. A material trough for placing rubber material is provided on the upper template. The extrusion plate is provided on the upper template and is movably matched with the upper template. A glue feed channel extending into the rubber roller cavity is provided at the bottom of the material trough.

[0007] Preferably, the lower template includes a base plate and a stripping template, the base plate is provided with an inlay groove, the stripping template is movably inlaid in the inlay groove, the rubber roller cavity has a middle groove provided on the stripping template and end grooves arranged on the left and right sides of the inlay groove, the middle groove and the end groove are connected to form a structure for positioning the lower half of the sleeve, and the shaft fixing groove is arranged on the end groove, and the upper half of the sleeve is positioned by the rubber roller cavity corresponding to the upper template.

[0008] Preferably, the front and rear positions of the inlay groove pass through the base plate, and the front and rear ends of the stripper plate are extended to form a pushing portion, which extends along the front and rear positions of the inlay groove to outside the base plate.

[0009] Preferably, the glue inlet channel corresponds to the substrate, one end of which extends to penetrate the material groove, and the other end extends to the end corresponding to the sleeve.

[0010] Preferably, the glue inlet channel has a longitudinal section and a transverse section. The longitudinal section is vertically arranged in the upper template and passes through the material trough. The transverse section is arranged between the upper template and the base plate. The transverse section is provided with a water outlet docking with the inlay groove.

[0011] Preferably, each rubber roller cavity is provided with two rubber feed channels, and the two rubber feed channels of each rubber roller cavity are symmetrically arranged along the shaft fixing groove.

[0012] Preferably, the glue inlet channel of each rubber roller cavity is arranged at one end thereof, and the glue inlet channel of the adjacent rubber roller cavity is arranged at the other end thereof.

[0013] Preferably, a waste channel corresponding to the ends of the rubber roller cavity is provided between the upper template and the lower template, and the waste channel is docked with the shaft fixing groove.

[0014] Preferably, the casing is made of steel pipe material.

[0015] Preferably, the low-hardness rubber roller forming mold further includes a bottom plate for fixing the lower template and a top plate for fixing the extrusion plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] An upper template, a lower template and an extrusion plate are set. The upper template has a material trough and cooperates with the extrusion plate. The material trough is used to place the rubber material for the molding rubber roller. Through the extrusion of the extrusion plate, the rubber material can enter the rubber roller cavity along the rubber inlet channel and be molded on the shaft core placed in advance. After demoulding, the rubber roller with the shaft core is automatically formed. On this basis, a positioning device is set between the upper template and the lower template. A sleeve in the rubber roller cavity allows the rubber material to enter the rubber roller cavity and fill the interior of the sleeve. After demoulding, the sleeve is taken out together with the rubber roller, and then the sleeve is taken off to form the structure of the rubber roller. Through this setting, the molded rubber roller has no parting line, thereby avoiding the occurrence of edge bursting and saving the grinding process; and the rubber roller cavity is placed in the mold with the sleeve for molding, which is interchangeable, has high demoulding efficiency, and has a low product quality. Moreover, the molded rubber roller does not need to be ground on the parting line, which greatly improves the precision of the molding.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the utility model when the extrusion plate is opened;

[0022] Figure 3 This is a structural diagram of the utility model with the upper template and the lower template opened;

[0023] Figure 4This is a schematic diagram of the structure of the utility model when the lower template is split;

[0024] Figure 5 This utility model Figure 4 Schematic diagram of the structure at A in the middle;

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the utility model taken along the glue inlet flow channel;

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of the utility model taken along the position of the rubber roller cavity.

[0027] The reference numerals and names in the figures are as follows:

[0028] Upper template 10, material trough 11, lower template 20, base plate 21, stripping template 22, inlay groove 23, pushing part 24, bottom plate 25, extrusion plate 30, top plate 31, rubber roller cavity 40, middle groove 41, end groove 42, sleeve 50, shaft fixing groove 60, shaft core 70, glue feed channel 80, longitudinal section 81, transverse section 82, water outlet 83, waste channel 90. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1-7 In an embodiment of the utility model, a low-hardness rubber roller forming mold with an optimized parting line includes an upper template 10, a lower template 20 and an extrusion plate 30. A plurality of rubber roller cavities 40 are evenly distributed between the upper template 10 and the lower template 20. A sleeve 50 for molding the surface of the rubber roller is positioned in each rubber roller cavity 40, and an axis fixing groove 60 for fixing the axis core 70 is provided at a position other than the two ends of each sleeve 50 between the upper template 10 and the lower template 20; a material trough 11 for placing rubber material is opened on the upper template 10, the extrusion plate 30 is arranged on the upper template 10 and is movably matched with the upper template 10, and a glue feed channel 80 extending into the rubber roller cavity 40 is opened at the bottom of the material trough 11.

[0031] In the above technical solution, an upper template 10, a lower template 20 and an extrusion plate 30 are provided. The upper template 10 is provided with a material trough 11 and cooperates with the extrusion plate 30. The material trough 11 is used to place the rubber material of the forming rubber roller. Through the extrusion of the extrusion plate 30, the rubber material can enter the rubber roller cavity 40 along the rubber feed channel 80 and thus be formed on the shaft core 70 placed in advance. After demoulding, the rubber roller with the shaft core 70 is automatically formed. On this basis, a positioning device is provided between the upper template 10 and the lower template 20 to form a sleeve in the rubber roller cavity 40. 50, so that the rubber material enters the rubber roller cavity 40 and fills the interior of the sleeve 50. After demoulding, the sleeve 50 is taken out together with the rubber roller, and the sleeve 50 is taken off after taking it out, so as to form the structure of the rubber roller. Through this setting, the molded rubber roller has no parting line, thereby avoiding the occurrence of edge bursting and saving the grinding process; and the rubber roller cavity 40 is placed in the mold with the sleeve 50 for molding, which is interchangeable, has high demoulding efficiency, and does not require product defects. Moreover, the molded rubber roller does not need to be ground on the parting line, which greatly improves the accuracy of the molding.

[0032] See also Figure 3-5 , this embodiment further proposes that the lower template 20 includes a base plate 21 and a stripping plate 22, the base plate 21 is provided with an embedding groove 23, the stripping plate 22 is movably embedded in the embedding groove 23, the rubber roller cavity 40 has a middle groove 41 provided on the stripping plate 22 and end grooves 42 arranged on the left and right sides of the embedding groove 23, the middle groove 41 and the end grooves 42 are connected to form a structure for positioning the lower half of the sleeve 50, and the shaft fixing groove 60 is provided on the end groove 42, and the upper half of the sleeve 50 is positioned by the rubber roller cavity 40 corresponding to the upper template 10; the lower template 20 is designed as the base plate 21 and the stripping plate 22 movably embedded in the embedding groove 23 of the base plate 21. This structure provides greater flexibility during the demolding process. When the rubber roller needs to be demolded after being formed, the demolding plate 22 can be first removed from the embedding groove 23 of the base plate 21. Since the demolding plate 22 has a partial structure of the rubber roller cavity 40, the rubber roller can be more conveniently demolded. In addition, the demolding plate 22 is vertically upward during the demolding process. Compared with the integral lower template 20, the movable embedded demolding plate 22 can reduce the direct pulling and damage to the rubber roller during demolding, especially for the rubber roller with low hardness, and can better protect its shape and structural integrity.

[0033] See also Figure 3-4, this embodiment further proposes that the front and rear positions of the inlay groove 23 pass through the base plate 21, and the front and rear ends of the stripping plate 22 are extended to form a pushing part 24, and the pushing part 24 extends along the front and rear positions of the inlay groove 23 to the outside of the base plate 21. The pushing part 24 is used to dock with a power mechanism, such as a hydraulic cylinder, a pneumatic cylinder, etc. The power mechanism can accurately control the movement speed and force of the stripping plate 22 to ensure the stability and reliability of each demoulding process, so as to achieve the ability to vertically drive the stripping plate 22 to move to complete the stripping operation; when the power mechanism fails or in some special circumstances, small-scale debugging, maintenance or trial production is required, the operator can manually use the pushing part 24 to remove the stripping plate 22. This manual operation design provides flexibility and emergency response. The manual demoulding operation is relatively simple, and the operator can intuitively control the demoulding process according to the actual situation to avoid production stagnation due to mechanical failure and other reasons.

[0034] See also Figure 3-6 , this embodiment further proposes that a glue feed channel 80 corresponds to the base plate 21, one end of which extends to penetrate the material trough 11, and the other end extends to the end corresponding to the sleeve 50. This design ensures that the glue can be accurately delivered to the key position of the rubber roller cavity 40; the glue feed channel 80 has a longitudinal section 81 and a transverse section 82, the longitudinal section 81 is vertically arranged in the upper template 10 and penetrates the material trough 11, and the transverse section 82 is arranged between the upper template 10 and the base plate 21, and the transverse section 82 is provided with a sprue 83 connected to the inlay groove 23; each rubber roller cavity 40 is provided with two glue feed channels 80, and the two glue feed channels 80 of each rubber roller cavity 40 are symmetrically arranged along the shaft fixing groove 60; this symmetrical layout helps to evenly fill the glue in the cavity; when the glue enters the cavity from the two symmetrical glue feed channels 80 at the same time, it can be evenly diffused to the surroundings, reducing stress concentration and deformation caused by unbalanced glue flow. For the rubber roller with the shaft core 70, the symmetrical glue feeding method can make the rubber material evenly wrapped around the shaft core 70, ensuring the bonding strength and integrity of the rubber roller and the shaft core 70. This is very important for improving the rotation accuracy and stability of the rubber roller, and can ensure the normal operation and working accuracy of the equipment in fields such as mechanical transmission and printing equipment. In addition, the glue feeding channel 80 of each rubber roller cavity 40 is set at one end thereof, and the glue feeding channel 80 of the adjacent rubber roller cavity 40 is set at the other end thereof. The adjacent rubber roller cavities 40 will not be set with a large spacing due to the conflict between the adjacent glue feeding channels 80, thereby improving the compactness of the overall structure. In large-scale production, more rubber roller products can be produced in a single vulcanization molding process, reducing the production cost per unit product.

[0035] See also Figure 3-5This embodiment further proposes that a waste channel 90 corresponding to the ends of the rubber roller cavity 40 is provided between the upper template 10 and the lower template 20. The waste channel 90 is docked with the shaft fixing groove 60 to achieve centralized collection of waste, facilitate waste cleaning, and prevent waste from interfering with the rubber roller molding, thereby ensuring the installation accuracy of the shaft core 70.

[0036] See also Figure 7 , this embodiment further proposes that the sleeve 50 is made of steel pipe material; the low hardness rubber roller forming mold also includes a bottom plate 25 for fixing the lower template 20 and a top plate 31 for fixing the extrusion plate 30, the top plate 31 and the bottom plate 25 are used for docking the punch press.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A low-hardness rubber roller forming mold with optimized parting line, characterized in that: The invention comprises an upper template (10), a lower template (20) and an extrusion plate (30); a plurality of rubber roller cavities (40) are evenly distributed between the upper template (10) and the lower template (20); a sleeve (50) for shaping the surface of the rubber roller is positioned in each rubber roller cavity (40); and shaft fixing grooves (60) for fixing the shaft core (70) are provided at positions other than the two ends of each sleeve (50) between the upper template (10) and the lower template (20); a material trough (11) for placing rubber material is provided on the upper template (10); the extrusion plate (30) is provided on the upper template (10) and is movably matched with the upper template (10); and a glue inlet flow channel (80) extending into the rubber roller cavity (40) is provided at the bottom of the material trough (11).

2. The low-hardness rubber roller forming mold with optimized parting line according to claim 1, characterized in that: The lower template (20) includes a base plate (21) and a stripping template (22). The base plate (21) is provided with an inlay groove (23). The stripping template (22) is movably inlaid in the inlay groove (23). The rubber roller cavity (40) has a middle groove (41) provided on the stripping template (22) and end grooves (42) provided on the left and right sides of the inlay groove (23). The middle groove (41) and the end grooves (42) are connected to form a structure for positioning the lower half of the sleeve (50), and the shaft fixing groove (60) is provided on the end groove (42). The upper half of the sleeve (50) is positioned by the rubber roller cavity (40) corresponding to the upper template (10).

3. The low-hardness rubber roller forming mold with optimized parting line according to claim 2, characterized in that: The front and rear positions of the inlay groove (23) pass through the base plate (21), and the front and rear ends of the stripping plate (22) are extended to form a pushing portion (24), and the pushing portion (24) extends along the front and rear positions of the inlay groove (23) to the outside of the base plate (21).

4. The low-hardness rubber roller forming mold with optimized parting line according to claim 2, characterized in that: The glue inlet channel (80) corresponds to the base plate (21), one end of which extends to penetrate the material trough (11), and the other end extends to the inside of the end portion corresponding to the sleeve (50).

5. The low-hardness rubber roller forming mold with optimized parting line according to claim 4, characterized in that: The glue inlet channel (80) comprises a longitudinal section (81) and a transverse section (82), wherein the longitudinal section (81) is vertically arranged in the upper template (10) and passes through the material trough (11), and the transverse section (82) is arranged between the upper template (10) and the base plate (21), and the transverse section (82) is provided with a water outlet (83) docked with the inlay groove (23).

6. The low-hardness rubber roller forming mold with optimized parting line according to claim 5, characterized in that: Each rubber roller cavity (40) is provided with two rubber feed channels (80), and the two rubber feed channels (80) of each rubber roller cavity (40) are symmetrically arranged along the shaft fixing groove (60).

7. The low-hardness rubber roller forming mold with optimized parting line according to claim 6, characterized in that: The glue inlet channel (80) of each rubber roller cavity (40) is arranged at one end thereof, and the glue inlet channel (80) of an adjacent rubber roller cavity (40) is arranged at the other end thereof.

8. A low-hardness rubber roller forming mold with optimized parting line according to claim 2 or 6, characterized in that: A waste channel (90) corresponding to the ends of the rubber roller cavity (40) is provided between the upper template (10) and the lower template (20), and the waste channel (90) is butt-jointed with the shaft fixing groove (60).

9. The low-hardness rubber roller forming mold with optimized parting line according to claim 1, characterized in that: The casing (50) is made of steel pipe material.

10. The low-hardness rubber roller forming mold with optimized parting line according to claim 1, characterized in that: The low-hardness rubber roller forming mold further comprises a bottom plate (25) for fixing the lower template (20) and a top plate (31) for fixing the extrusion plate (30).

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