A self-centering rubber-encapsulated bearing vulcanization mold

Abstract

The self-centering rubber-encased bearing vulcanization mold disclosed in the present invention is formed by the cooperation of seven parts, namely, an upper mold cavity, a lower mold cavity, a middle sleeve, a mold core, a pressure cover, a nut, and a positioning column, wherein the middle sleeve is located between the upper mold cavity and the lower mold cavity and is positioned with the upper mold cavity and the lower mold cavity, the positioning column is positioned on the lower mold cavity, the mold core is positioned on the positioning column, the inner ring of the bearing is positioned on the mold core and placed in the middle mold cavity of the middle sleeve, the pressure cover is sleeved on the mold core and positioned on the upper mold cavity, the pressure cover is locked by screwing the nut on the mold core, and the bearing is positioned in the middle mold cavity of the middle sleeve after the pressure cover is locked, and the rubber is completely bonded to the outer diameter surface of the bearing through high-temperature vulcanization to form a rubber-encased bearing. The present invention improves product quality and greatly improves the qualified rate when the rubber-encased bearing is vulcanized. The optimized mold has good concentricity, and the thickness and width of the rubber layer of the produced product are uniform and stable.

Description

Technical Field

[0001] The invention relates to the technical field of a vulcanization mold for a rubber-coated bearing, which is a convenient, efficient and long-service-life self-centering vulcanization mold for a rubber-coated bearing. Background Art

[0002] Molds are various molds and tools used in industrial production to obtain the desired products by injection molding, blow molding, extrusion, die casting or forging, smelting, stamping and other methods. In short, molds are tools used to make molded objects. This tool is composed of various parts, and different molds are composed of different parts.

[0003] Rubber-coated bearings are formed by vulcanizing rubber on bearings through compression molding with the help of molds. The requirements for molds for rubber-coated bearings are different from those for general rubber product molds. Rubber-coated bearing molds are more complex and have more components. There are higher requirements for the coordination between the components, which must ensure both precise positioning and a long service life. This new type of rubber-coated bearing mold perfectly solves the above problems.

[0004] However, the current rubber-coated bearing vulcanization mold has problems such as mold damage due to insufficient mold positioning during the vulcanization process, short mold service life, low product quality, low production efficiency, low product qualification rate and high production cost. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a self-centering rubber-coated bearing vulcanization mold to solve the problem of insufficient mold positioning during the vulcanization process, which causes the mold to be crushed and the mold has a short service life. The self-centering rubber-coated bearing vulcanization mold solves the problem of low product quality, greatly improves production efficiency and product qualification rate, and reduces production costs.

[0006] The technical solution adopted by the present invention to solve the above problems is:

[0007] The self-centering rubber-encapsulated bearing vulcanization mold is formed by an upper mold cavity, a lower mold cavity, a middle sleeve, a mold core, a pressure cover, a nut, and a positioning column, which cooperate with each other. The middle sleeve is located between the upper mold cavity and the lower mold cavity and is positioned with the upper mold cavity and the lower mold cavity. The positioning column is positioned on the lower mold cavity, the mold core is positioned on the positioning column, the inner ring of the bearing is positioned on the mold core and placed in the middle mold cavity of the middle sleeve, the pressure cover is sleeved on the mold core and positioned on the upper mold cavity, and the pressure cover is locked by screwing the nut on the mold core. After the pressure cover is locked, the bearing is positioned in the middle mold cavity of the middle sleeve. Through high-temperature vulcanization, the rubber is completely bonded to the outer diameter surface of the bearing to form a rubber-encapsulated bearing.

[0008] In a preferred embodiment of the present invention, an upper tapered boss is provided at the lower portion of the upper mold cavity, a lower tapered boss is provided at the upper portion of the lower mold cavity, an upper tapered concave surface is provided at the upper portion of the middle sleeve, and a lower tapered concave surface is provided at the lower portion of the middle sleeve. The upper tapered concave surface at the upper portion of the middle sleeve is closely matched with the upper tapered boss at the lower portion of the upper mold cavity, and the lower tapered concave surface at the lower portion of the middle sleeve is closely matched with the lower tapered boss at the upper portion of the lower mold cavity, so that the upper mold cavity, the middle sleeve and the lower mold cavity are positioned and matched, thereby ensuring the concentricity of the vulcanization mold and improving the life of the vulcanization mold.

[0009] In a preferred embodiment of the present invention, a positioning hole is provided at the center of the lower mold cavity, and the positioning column is coaxially provided with an upper positioning column and a lower positioning column. The lower positioning column is interference fit with the positioning hole for positioning. The positioning column also serves as a guide column when the bearing mold is matched, thereby reducing the probability of mold damage and preventing quality defects such as eccentricity of the product. At the same time, only the positioning column needs to be replaced after the mold is worn, and replacement is convenient.

[0010] In a preferred embodiment of the present invention, the mold core is in a stepped shape, and is composed of a coaxially arranged external thread section, a pressure cap conical positioning section, a bearing inner diameter positioning section and a bearing inner diameter end face positioning section from top to bottom. An inner positioning hole is also provided in the mold core, and the inner positioning hole is loosely fitted on the upper positioning column; a lower inner taper concave surface is provided in the lower mold cavity, and a lower outer taper positioning surface is provided on the bearing inner diameter end face positioning section, and the lower outer taper positioning surface on the bearing inner diameter end face positioning section is in a substantially uniform relationship with the lower inner taper concave surface on the lower mold cavity. The taper is tightly matched; the bearing inner diameter positioning section is positioned and matched with the inner diameter of the inner ring of the bearing; an inner taper positioning hole and an upper outer taper positioning surface are arranged on the pressure cover, and an upper inner taper concave surface is arranged in the upper mold cavity. The inner taper positioning hole on the pressure cover is taper-tightly matched with the pressure cover conical positioning section, and the upper outer precision positioning surface on the pressure cover is taper-tightly matched with the upper inner taper concave surface on the upper mold cavity; the bottom surface of the pressure cover and the top surface of the bearing inner diameter end face positioning section jointly position the upper and lower end faces of the inner ring of the bearing.

[0011] Due to the adoption of the above technical solution, the self-centering rubber-encased bearing vulcanization mold of the present invention improves product quality and significantly improves the qualified rate when the rubber-encased bearing is vulcanized. The optimized mold has good concentricity, and the thickness and width of the rubber layer of the produced product are uniform and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the vulcanization mold of the self-centering rubber-encased bearing of the present invention.

[0013] Figure 2 It is a schematic diagram of the exploded structure of the vulcanization mold of the self-centering rubber-encased bearing of the present invention.

[0014] Figure 3 The figure is a schematic diagram of the use state of the self-centering rubber-coated bearing vulcanization mold of the present invention when vulcanizing the rubber-coated bearing. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] See also Figures 1 to 3 The self-centering rubber-encapsulated bearing vulcanization mold shown in the figure is formed by seven parts, namely, an upper mold cavity 10, a lower mold cavity 20, a middle sleeve 30, a mold core 40, a pressure cover 50, a nut 60, and a positioning column 70, which cooperate with each other.

[0017] Specifically:

[0018] An upper tapered boss 11 is provided at the lower portion of the upper die cavity 10 , and an upper inner tapered concave surface 12 is provided inside the upper die cavity 10 .

[0019] A lower tapered boss 21 is provided on the upper portion of the lower die cavity 20 , and a lower inner tapered concave surface 22 is provided in the lower die cavity 20 .

[0020] An upper tapered concave surface 31 is provided at the upper part of the middle sleeve 30, and a lower tapered concave surface 32 is provided at the lower part. The upper tapered concave surface 31 at the upper part of the middle sleeve 30 is tapered and tightly matched with the upper tapered boss 11 at the lower part of the upper mold cavity 10, and the lower tapered concave surface 32 at the lower part of the middle sleeve 30 is tapered and tightly matched with the lower tapered boss 21 at the upper part of the lower mold cavity 20, so that the upper mold cavity 10, the middle sleeve 20, and the lower mold cavity 30 are positioned and matched, ensuring the concentricity of the vulcanization mold and improving the life of the vulcanization mold.

[0021] A positioning hole 23 is arranged at the center of the lower mold cavity 20, and an upper positioning column 71 and a lower positioning column 72 are coaxially arranged on the positioning column 70. The lower positioning column 72 is positioned by interference fit with the positioning hole 23. The positioning column 70 also serves as a guide column when the bearing mold is matched, which reduces the probability of mold damage and eliminates quality defects such as eccentricity of the product. At the same time, when the mold is worn, only the positioning column 70 needs to be replaced, which is convenient for replacement.

[0022] The mold core 40 is in a stepped shape, and consists of a coaxially arranged external thread section 41, a pressure cap conical positioning section 42, a bearing inner diameter positioning section 43 and a bearing inner diameter end face positioning section 44 from top to bottom. An internal positioning hole 45 is also provided in the mold core 40, and the internal positioning hole 45 is loosely fitted on the upper positioning column 71.

[0023] A lower outer tapered positioning surface 44 a is provided on the bearing inner diameter end surface positioning section 44 , and the lower outer tapered positioning surface 44 a on the bearing inner diameter end surface positioning section 44 is closely matched with the lower inner tapered concave surface 22 on the lower mold cavity 20 in a tapered manner.

[0024] The bearing inner diameter positioning section 43 is positioned and matched with the inner diameter of the inner ring 81 of the bearing 80 .

[0025] The gland 50 is provided with an inner taper positioning hole 51 and an upper outer taper positioning surface 52. The inner taper positioning hole 51 on the gland 50 is tapered and tightly matched with the gland conical positioning section 42. The upper outer precision positioning surface 52 on the gland 50 is tapered and tightly matched with the upper inner taper concave surface 12 on the upper mold cavity 10. The gland 50 is locked by a nut 60 screwed on the external thread section 41 of the mold core 40. After the gland 50 is locked, the bottom surface 53 of the gland 50 and the top surface 44b of the bearing inner diameter end surface positioning section 44 jointly position the upper and lower end surfaces of the inner ring 81 of the bearing 80. In this way, the bearing 80 is positioned in the middle mold cavity 33 of the middle sleeve 30. Through high temperature vulcanization, the rubber is completely bonded to the outer diameter surface of the outer ring 82 of the bearing 80 to form a rubber-encapsulated bearing.

[0026] The use process of the self-centering rubber-encased bearing vulcanization mold of the present invention is as follows:

[0027] Production preparation stage: Place the required rubber-coated bearing 80 on the bearing inner diameter positioning section 43 of the mold core 40, cover it with the pressure cover 50, and tighten it with the nut 60 by screwing. Wrap the outer ring 82 of the bearing 80 with a circle of standard rubber strip 90 for standby use to form a first whole.

[0028] Vulcanization stage: The lower positioning column 72 of the positioning column 70 is fixed with the positioning hole 23 of the lower mold cavity 20 through interference fit, and the lower tapered concave surface 32 of the lower part of the middle sleeve 30 is closely fitted with the lower tapered boss 21 of the upper part of the lower mold cavity 20. The first whole formed in the preparation stage is formed with a clearance fit between the inner positioning hole 45 in the mold core 40 and the upper positioning column 71. After the upper mold cavity 10 is covered, all the accessories are combined to form a second whole. The second whole is placed on a vulcanizing machine, molded, pressurized and heated, so that the rubber and the bearing 80 are vulcanized in the mold. During the mold closing and pressurization stage, the mold core 40 can be accurately positioned with the lower mold cavity 20 in advance with the help of the guiding effect of the positioning column 70. Avoid the mold core from crushing the mold cavity.

[0029] Demolding stage: Due to the effect of rubber vulcanization, the middle sleeve 30 will be fixed together with the first whole, and the first whole and the middle sleeve 30 fixed together will be separated from the first whole on a special tooling, and then the first whole will be disassembled to obtain the required rubber-coated bearing.

[0030] The above is a specific implementation of the invented rubber bearing mold. Although the mold of the present invention has many components, each component cooperates with each other and has high production efficiency. The positioning column 70 and the lower mold cavity 20 are designed as two parts to reduce maintenance costs.

Claims

1. Self-centering rubber-encapsulated bearing vulcanization mold, characterized in that: The upper mold cavity, the lower mold cavity, the middle sleeve, the mold core, the pressure cover, the nut, and the positioning column are formed by mutual cooperation, wherein the middle sleeve is located between the upper mold cavity and the lower mold cavity and is positioned with the upper mold cavity and the lower mold cavity, the positioning column is positioned on the lower mold cavity, the mold core is positioned on the positioning column, the inner ring of the bearing is positioned on the mold core and placed in the middle mold cavity of the middle sleeve, the pressure cover is sleeved on the mold core and positioned on the upper mold cavity, the pressure cover is locked by screwing the nut on the mold core, and the bearing is positioned in the middle mold cavity of the middle sleeve after the pressure cover is locked, and the rubber is completely bonded to the outer diameter surface of the bearing through high-temperature vulcanization to form a rubber-coated bearing; a positioning hole is provided in the center of the lower mold cavity, and the positioning column is coaxially provided with an upper positioning column and a lower positioning column, and the lower positioning column is positioned by interference fit with the positioning hole, specifically: the positioning column also serves as a guide column when the bearing mold is matched; the first whole formed in the preparation stage is formed into a clearance fit between the inner positioning hole in the mold core and the upper positioning column.

2. The self-centering rubber-encased bearing vulcanization mold according to claim 1, characterized in that: An upper tapered boss is arranged at the lower part of the upper mold cavity, a lower tapered boss is arranged at the upper part of the lower mold cavity, an upper tapered concave surface is arranged at the upper part of the middle sleeve, and a lower tapered concave surface is arranged at the lower part of the middle sleeve. The upper tapered concave surface of the upper part of the middle sleeve is closely matched with the upper tapered boss of the lower part of the upper mold cavity, and the lower tapered concave surface of the lower part of the middle sleeve is closely matched with the lower tapered boss of the upper part of the lower mold cavity, so that the upper mold cavity, the middle sleeve and the lower mold cavity are positioned and matched.

3. The self-centering rubber-encased bearing vulcanization mold according to claim 1, characterized in that: The mold core is in a stepped shape, and is composed of a coaxially arranged external thread section, a pressure cap conical positioning section, a bearing inner diameter positioning section and a bearing inner diameter end face positioning section from top to bottom. An inner positioning hole is also arranged in the mold core, and the inner positioning hole positioning sleeve is on the upper positioning column; a lower inner taper concave surface is arranged in the lower mold cavity, and a lower outer taper positioning surface is arranged on the bearing inner diameter end face positioning section. The lower outer taper positioning surface on the bearing inner diameter end face positioning section is tapered and tightly matched with the lower inner taper concave surface on the lower mold cavity; The bearing inner diameter positioning section is positioned and matched with the inner diameter of the inner ring of the bearing; an inner taper positioning hole and an upper outer taper positioning surface are arranged on the pressure cover, and an upper inner taper concave surface is arranged in the upper mold cavity. The inner taper positioning hole on the pressure cover is tapered and tightly matched with the pressure cover conical positioning section, and the upper outer precision positioning surface on the pressure cover is tapered and tightly matched with the upper inner taper concave surface on the upper mold cavity; the bottom surface of the pressure cover and the top surface of the bearing inner diameter end face positioning section jointly position the upper and lower end faces of the inner ring of the bearing.

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