Non-spring tire mold pore sleeve and additive manufacturing method thereof

Abstract

The invention relates to the field of tire manufacturing, in particular to a non-spring tire mold air hole sleeve and an additive manufacturing method thereof.The non-spring tire mold air hole sleeve comprises an assembly structure, an exhaust structure is arranged in the assembly structure, and multiple staggered and stacked air hole layers are arranged on the exhaust structure; the air hole layer is composed of a plurality of evenly-distributed air holes, the air holes are square, and the hole diameter of the air holes ranges from 0.05 mm to 0.5 mm. The staggered size of the air hole layers is half of the aperture of the air holes; the non-spring tire mold air hole sleeve is integrally formed by adopting a laser powder bed melting technology LPBF; the ventilation flow of the non-spring tire mold air hole sleeve can be customized and designed according to the exhaust requirement of the mold, the structure is simple, maintenance is convenient, glue can be effectively prevented from entering the air hole strip, the fatigue failure phenomenon of the spring air hole sleeve structure is avoided, the service life of the air hole sleeve is prolonged, and the maintenance frequency of the tire mold is reduced.

Description

Technical Field

[0001] The invention relates to the field of tire manufacturing, and more particularly to a non-spring tire mold air hole sleeve and an additive manufacturing method thereof. Background Art

[0002] Pore ​​sleeves are widely used in various mold types in the field of tire manufacturing, including passenger car tires, truck tires, industrial tires, etc. In addition to tire manufacturing, other industries that require mold molding, such as plastic molding, rubber molding, etc., also use pore sleeves to improve the quality of finished products and production efficiency. Tire mold pore sleeves are crucial components in the tire manufacturing process. They are mainly used for the ventilation and exhaust systems of the mold.

[0003] During the production process, the rubber in a semi-fluid state tends to flow toward the peripheral side of the core shaft head and enter the exhaust channel. On the one hand, it causes the spring sleeve to be blocked, the spring sleeve to fail, and the tire to be flat and produce a waste tire. On the other hand, it is difficult to clean the rubber that enters the spring sleeve, so the spring sleeve can only be replaced, which is difficult and costly. The existing spring pore sleeve structure has an immutable ventilation flow rate. To change the exhaust volume of the tire mold, the number of spring pore sleeves can only be increased or decreased, which is not conducive to the flexible manufacturing of the tire mold. Secondly, when the spring structure is in a high temperature and high pressure environment for a long time, the spring pore sleeve is prone to fatigue fracture, causing the spring pore sleeve to fail. Summary of the invention

[0004] The purpose of the present invention is to provide a non-spring tire mold pore sleeve and an additive manufacturing method thereof. The ventilation flow of the non-spring tire mold pore sleeve can be customized according to the mold exhaust requirements. The structure is simple and maintenance is convenient. It can effectively avoid glue entering the pore strip and fatigue failure of the spring pore sleeve structure, thereby increasing the service life of the pore sleeve and reducing the maintenance frequency of the tire mold.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A non-spring tire mold air hole sleeve comprises an assembly structure, an exhaust structure is arranged in the assembly structure, and a plurality of mutually staggered and stacked air hole layers are arranged on the exhaust structure;

[0007] The pore layer is composed of a plurality of evenly distributed pores, the pores are regular quadrilaterals, and the pore diameters are 0.05-0.5 mm;

[0008] The interlaced size of the pore layers is half of the pore diameter;

[0009] The pore sizes of the multiple pore layers are the same;

[0010] The pore size of the multi-layer pore layer changes uniformly from 0.05 to 0.5 mm along the length direction of the pore sleeve;

[0011] The density of the assembly structure is above 99.5%, the height of the assembly structure is H, the outer diameter of the assembly structure is R, the outer ring of the assembly structure includes a limiting step, the height of the limiting step is 0-1 / 2H, and the outer diameter of the step is R-(1-2) mm;

[0012] The height of the exhaust structure is 1 / 5H-H, the top of the exhaust structure is flush with the top of the assembly structure, the bottom of the exhaust structure is a self-supporting structure, and the angle α between the bottom of the exhaust structure and the bottom plane of the assembly structure is 40-70°;

[0013] The thickness of the assembly structure is 0.4-10 mm, and there is 0.1-0.5 mm interference between the assembly structure and the exhaust structure;

[0014] A non-spring tire mold pore sleeve additive manufacturing method, the non-spring tire mold pore sleeve adopts laser powder bed fusion technology (LPBF) to form an integrated structure;

[0015] The material of the non-spring tire mold pore sleeve manufactured by the laser powder bed melting technology is stainless steel, aluminum alloy, titanium alloy or mold steel material, and the original material powder particle size is 10-63um; the laser forming power of the laser powder bed melting equipment is 150W-475W, the laser scanning speed is 600mm / s-3000mm / s, the laser scanning spacing is 0.06mm-0.60mm, the powder layer thickness of the selective laser melting equipment is 20μm-60μm, and the molding atmosphere is argon or nitrogen;

[0016] The laser scanning strategy for the assembly structure is short straight line or long straight line, and the laser scanning strategy for the exhaust structure is long straight line or short straight line. In the short straight line laser scanning strategy, the area width of the black area and the white area is 5-15mm, and the overlap between the black area and the white area is 0.05-0.15mm. The scanning line rotates 67 degrees per layer, the laser scanning interval is 0.06-0.16mm, and the scanning line is offset by 0.5 area width per layer; in the long straight line laser scanning strategy, the angle of each layer of the scanning line is 0 degree and 90 degree, and the scanning line of the n+1th layer and the nth layer is offset by 0.5 laser scanning interval;

[0017] The beneficial effects of the present invention are:

[0018] The ventilation flow of the non-spring tire mold pore sleeve can be customized according to the mold exhaust requirements. It has a simple structure and is easy to maintain. The multiple layers of staggered pores can effectively prevent glue from entering the pore strip. The non-spring design avoids fatigue failure of the spring pore sleeve structure, thereby increasing the service life of the pore sleeve and reducing the maintenance frequency of the tire mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] Figure 1 It is a schematic diagram of the structure of the air hole sleeve of the non-spring tire mold of the present invention;

[0021] Figure 2 is a schematic diagram of staggered distribution of pores in adjacent layers of the present invention;

[0022] Figure 3 is a cross-sectional view of the air hole sleeve of the non-spring tire mold of the present invention;

[0023] Figure 4 is a schematic diagram of a pore cross section of the present invention;

[0024] Figure 5 is a schematic diagram of the laser scanning strategy for a long straight line of the present invention;

[0025] Figure 6 is a schematic diagram of the laser scanning strategy for a short straight line of the present invention;

[0026] Figure 7 It is a structural schematic diagram of embodiment 2 of the present invention.

[0027] In the figure: assembly structure 1; exhaust structure 2. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 to Figure 2 As shown, in order to achieve the technical effect of "the ventilation flow of the non-spring tire mold pore sleeve can be customized according to the mold scheduling requirements, the structure is simple, and the maintenance is convenient, which can effectively avoid the glue from entering the pore strip, avoid the fatigue failure of the spring pore sleeve structure, increase the service life of the pore sleeve, and reduce the maintenance frequency of the tire mold", the structure and function of the non-spring tire mold pore sleeve are described in detail below;

[0030] A non-spring tire mold air hole sleeve comprises an assembly structure 1, wherein an exhaust structure 2 is arranged inside the assembly structure 1, and a plurality of mutually staggered and stacked air hole layers are arranged on the exhaust structure 2;

[0031] The pore layer is composed of a plurality of evenly distributed pores, the pores are regular quadrilaterals, and the pore diameters are 0.05-0.5 mm;

[0032] The interlaced size of the pore layers is half of the pore diameter;

[0033] The pore diameters of the multiple pore layers are the same; or the pore diameters of the multiple pore layers are uniformly changed from 0.05 to 0.5 mm along the length direction of the pore sleeve, and are set according to the use requirements;

[0034] The density of the assembly structure 1 is above 99.5%, the height of the assembly structure 1 is H, the outer diameter of the assembly structure 1 is R, the outer ring of the assembly structure 1 includes a limiting step, the height of the limiting step is 0-1 / 2H, and the outer diameter of the step is R-(1-2) mm;

[0035] The height of the exhaust structure 2 is 1 / 5H-H, the top of the exhaust structure 2 is flush with the top of the assembly structure 1, the bottom of the exhaust structure 2 is a self-supporting structure, and the angle between the bottom of the exhaust structure 2 and the bottom plane of the assembly structure 1 is 40-70°;

[0036] The thickness of the assembly structure 1 is 0.4-10 mm, and there is 0.1-0.5 mm interference between the assembly structure 1 and the exhaust structure 2;

[0037] A non-spring tire mold pore sleeve additive manufacturing method, the non-spring tire mold pore sleeve adopts laser powder bed fusion technology (LPBF) to form an integrated structure;

[0038] The material of the non-spring tire mold pore sleeve manufactured by the laser powder bed melting technology is stainless steel, aluminum alloy, titanium alloy or mold steel material, and the particle size of the original powder is 10-63um um; the laser forming power of the laser powder bed melting equipment is 150W-475W, the laser scanning speed is 600mm / s-3000mm / s, the laser scanning spacing is 0.06mm-0.60mm, the powder layer thickness of the selective laser melting equipment is 20μm-60μm, and the molding atmosphere is argon or nitrogen.

[0039] The laser scanning strategy of assembly structure 1 is a long straight line or a short straight line, and the laser scanning strategy of exhaust structure 2 is a long straight line or a short straight line; in the short straight line laser scanning strategy, the area width of the black area and the white area is 5-15mm, the overlap between the black area and the white area is 0.05-0.15mm, the scanning line rotates 67 degrees per layer, the laser scanning interval is 0.06-0.16mm, and the scanning line is offset by 0.5 area width per layer; in the long straight line laser scanning strategy, the angle of each layer of the scanning line is 0 degree and 90 degrees, wherein 0 degree is parallel to the scraper movement direction, and 90 degrees is perpendicular to the scraper movement direction, and the scanning lines of the n+1th layer and the nth layer are offset by 0.5 laser scanning intervals.

[0040] like Figures 3 to 6 As shown, the data and process of the non-spring tire mold pore sleeve and the additive manufacturing method thereof are described in detail by example;

[0041] A tire mold air hole sleeve without a spring structure, the tire mold air hole sleeve without a spring structure comprises an assembly structure 1 and an exhaust structure 2, the density of the assembly structure 1 is above 99.5%, the height of the assembly structure 1 is 4 mm, the outer diameter is 4 mm, the inner diameter is 3.2 mm, the outer ring of the assembly structure 1 has a limiting step, and the limiting step height is 0 mm;

[0042] The outer diameter of the exhaust structure 2 is 3.8 mm, the height of the exhaust structure 2 is 4 mm, the top of the exhaust structure 2 is flush with the assembly structure 1, the bottom of the exhaust structure 2 is a self-supporting structure, and the angle α between the exhaust structure 2 and the bottom plane of the assembly structure 1 is 45°;

[0043] The pore diameter of the exhaust structure 2 is 0.32mm, the pores are stacked layer by layer, the staggered size of the exhaust structure 2 is 0.16mm, the pore diameter of the exhaust structure 2 can be uniform, the thickness of the assembly structure is 0.25mm, and there is 0.15mm interference between the exhaust mechanisms;

[0044] The non-spring structure tire mold pore sleeve is formed by laser powder bed fusion technology (LPBF), and the particle size of the raw material 17-4PH powder is 15-53um; the laser forming power of the laser powder bed melting equipment is 210W, the laser scanning speed is 800mm / s, the laser scanning spacing is 0.32mm, the powder layer thickness of the selective laser melting equipment is 40μm, and the forming atmosphere is argon or nitrogen;

[0045] The laser scanning strategy of assembly structure 1 is short straight lines, the area width of the black area and the white area is 10mm, the overlap between the black area and the white area is 0.05mm, the scanning line rotates 67 degrees per layer, and the laser scanning spacing is 0.11mm. The laser scanning strategy of exhaust structure 2 is long straight lines, and the angles of the scanning lines of each layer are 0 degrees and 90 degrees, where 0 degrees is parallel to the scraper movement direction and 90 degrees is perpendicular to the scraper movement direction. The scanning lines of the n+1th layer and the nth layer are offset by 0.16mm;

[0046] After the non-spring structure tire mold pore sleeve is printed, it is removed from the substrate by wire cutting and then magnetically ground for 15 minutes at a speed of 400r / min.

[0047] like Figure 1 As shown, the arrow direction is the exhaust direction. When in use, the pore sleeve is embedded in the vent hole of the mold. When the mold is heated, the pore sleeve discharges excess gas in the mold cavity. During high-pressure molding, it helps balance the internal pressure and avoid damage to the mold.

[0048] Implementation Case 2

[0049] like Figure 7As shown, a tire mold air hole sleeve without a spring structure, the tire mold air hole sleeve without a spring structure comprises an assembly structure 1 and an exhaust structure 2, the density of the assembly structure 1 is above 99.5%, the height of the assembly structure 1 is 12 mm, the outer diameter is 6 mm, the inner diameter is 5 mm, the outer ring of the assembly structure 1 contains a limiting step, and the limiting step height is 5 mm; the outer diameter of the exhaust structure 2 is 5.3 mm, the height of the exhaust structure 2 is 12 mm, the top of the exhaust structure 2 is flush with the assembly structure 1, the bottom of the exhaust structure 2 is a self-supporting structure, and the angle α between the exhaust structure 2 and the bottom plane of the assembly structure 1 is 65°;

[0050] The pore diameter of the exhaust structure 2 is 0.20mm, the pores are stacked layer by layer, the staggered size of the exhaust structure 2 is 0.1mm, the pore diameter of the exhaust structure 2 can be uniform, the thickness of the assembly structure is 0.5mm, and there is 0.15mm interference between the exhaust mechanisms;

[0051] The non-spring structure tire mold pore sleeve is formed by laser powder bed fusion technology (LPBF), and the particle size of the raw material 18Ni300 powder is 10-63um; the laser forming power of the laser powder bed melting equipment is 295W, the laser scanning speed is 960mm / s, the laser scanning spacing is 0.2mm, the powder layer thickness of the selective laser melting equipment is 40μm, and the forming atmosphere is argon or nitrogen;

[0052] The laser scanning strategy of assembly structure 1 is long straight lines, the scanning line rotates 67 degrees per layer, and the laser scanning pitch is 0.1mm. The laser scanning strategy of exhaust structure 2 is short straight lines, the area width of the black area and the white area is 12mm, the overlap between the black area and the white area is 0.09mm, and the angle of each layer of scanning line is 0 degree and 90 degree, where 0 degree is parallel to the scraper movement direction and 90 degrees is perpendicular to the scraper movement direction. The scanning line of the n+1th layer and the nth layer is offset by 0.5 laser scanning pitch;

[0053] After the non-spring structure tire mold pore sleeve is printed, it is removed from the substrate by wire cutting and then magnetically ground for 15 minutes at a speed of 400r / min.

[0054] like Figure 1 As shown, the arrow direction is the exhaust direction. When in use, the pore sleeve is embedded in the vent hole of the mold. When the mold is heated, the pore sleeve discharges excess gas in the mold cavity. During high-pressure molding, it helps balance the internal pressure and avoid damage to the mold.

Claims

1. A non-spring tire mold vent sleeve, comprising an assembly structure (1), characterized in that: An exhaust structure (2) is arranged inside the assembly structure (1), and a plurality of mutually staggered and stacked pore layers are arranged on the exhaust structure (2).

2. The non-spring tire mold pore sleeve according to claim 1, characterized in that: The pore layer is composed of a plurality of evenly distributed pores, the pores are regular quadrilaterals, and the pore diameters are 0.05-0.5 mm.

3. The non-spring tire mold pore sleeve according to claim 2, characterized in that: The interlaced size of the pore layers is half of the pore diameter.

4. The non-spring tire mold pore sleeve according to claim 2, characterized in that: The pore diameters of the multiple pore layers are the same.

5. The non-spring tire mold vent sleeve according to claim 2, characterized in that: The pore diameter of the multi-layer porous layer changes uniformly from 0.05 to 0.5 mm along the length direction of the porous sleeve.

6. The non-spring tire mold vent sleeve according to claim 1, characterized in that: The density of the assembly structure (1) is above 99.5%, the height of the assembly structure (1) is H, the outer diameter of the assembly structure (1) is R, the outer ring of the assembly structure (1) comprises a limiting step, the height of the limiting step is 0-1 / 2H, and the outer diameter of the step is R-(1-2) mm.

7. The non-spring tire mold vent sleeve according to claim 6, characterized in that: The height of the exhaust structure (2) is 1 / 5H-H, the top of the exhaust structure (2) is flush with the top of the assembly structure (1), the bottom of the exhaust structure (2) is a self-supporting structure, and the angle α between the bottom of the exhaust structure (2) and the bottom plane of the assembly structure (1) is 40-70°.

8. The non-spring tire mold vent sleeve according to claim 1, characterized in that: The thickness of the assembly structure (1) is 0.4-10 mm, and there is an interference of 0.1-0.5 mm between the assembly structure (1) and the exhaust structure (2).

9. A method for additive manufacturing of a non-spring tire mold pore sleeve, characterized in that: The non-spring tire mold pore sleeve is integrally formed by laser powder bed fusion (LPBF) technology.

10. The additive manufacturing method for a non-spring tire mold pore sleeve according to claim 9, characterized in that: The material of the non-spring tire mold pore sleeve manufactured by the laser powder bed melting technology is stainless steel, aluminum alloy, titanium alloy or mold steel material, and the original material powder particle size is 10-63um; the laser forming power of the laser powder bed melting equipment is 150W-475W, the laser scanning speed is 600mm / s-3000mm / s, the laser scanning spacing is 0.06mm-0.60mm, the powder layer thickness of the selective laser melting equipment is 20μm-60μm, and the molding atmosphere is argon or nitrogen; The laser scanning strategy of the assembly structure (1) is a short straight line or a long straight line, and the laser scanning strategy of the exhaust structure (2) is a long straight line or a short straight line. In the short straight line laser scanning strategy, the area width of the black area and the white area is 5-15 mm, and the overlap between the black area and the white area is 0.05-0.15 mm. The scanning line rotates 67 degrees per layer, the laser scanning interval is 0.06-0.16 mm, and the scanning line is offset by 0.5 area width per layer; in the long straight line laser scanning strategy, the angle of each layer of the scanning line is 0 degree and 90 degree, and the scanning lines of the n+1th layer and the nth layer are offset by 0.5 laser scanning intervals.

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