CN108213426A - A kind of repeatable utilization tire-mold manufacturing method based on increases material manufacturing technology - Google Patents

Abstract

The invention discloses a reusable tire mold manufacturing method based on additive manufacturing technology. A single tire mold is processed in blocks. The single tire mold is divided into an additive manufacturing body and a machining base. The additive manufacturing body passes The additive manufacturing process is processed, and the machined substrate is processed by the traditional manufacturing process, and the two are combined through a mechanical connection, and finally the tire is formed. Driven by 3D drawing software, metal powder is melted layer by layer or fed in synchronously to produce additive manufacturing objects with complex patterns. The original additive manufacturing body is separated from the machining base; then the new additive manufacturing body is connected to the original machining base and assembled into a single overall mold, and then assembled into a complete mold. The production link of the present invention is more efficient, and is more energy-saving and environment-friendly compared with traditional processing methods; at the same time, vulcanization of tires with different types of patterns is more convenient and quick, and the machined substrate can be reused, which saves production and manufacturing costs.

Description

A reusable tire mold manufacturing method based on additive manufacturing technology

technical field

The invention relates to a novel tire mold manufacturing method, in particular to a tire mold manufacturing method combining an additive manufacturing body and a reusable base body through a detachable mechanism, and belongs to the field of advanced manufacturing.

Background technique

Dies are widely used in various fields of national economy. Throughout the development history of molds, from the initial pure hand-made, to mechanical processing, to the digital design and CNC machining of automatic control molds that are commonly used today, the precision and complexity of molds are getting higher and higher, and the cost and production cycle are gradually increasing. reduce. With the rapid development of my country's automobile industry, the manufacturing level of tire molds and tires has also made great progress. The rapid upgrading of the automobile tire industry has stimulated the continuous growth of the tire mold market. Tire mold is vulcanization molding equipment on the tire production line, which is used to process the appearance characteristics of tire patterns, patterns, fonts, etc. Therefore, it is a very personalized and dynamic product, and its technical content and precision are relatively high. At present, there are generally four types of processing methods for tire molds at home and abroad: decals, EDM, precision casting and high-speed milling and engraving, among which EDM and high-speed milling and engraving are the most common. EDM technology has very good professional advantages in processing complex cavities, micropores, superhard and brittle materials, but the rough surface after processing requires manual grinding and polishing, which is not only inefficient but also difficult to achieve uniform surface quality. As a high-precision, high-efficiency advanced manufacturing technology, high-speed machining technology also has some inevitable limitations, such as difficulty in processing complex patterns with many pattern steel sheets and small pattern angles, and the cost of equipment and tools is high , and thus have not been widely used. With the improvement of the requirements for car comfort and adapting to complex and harsh road conditions, people have put forward higher standards for the performance of car tires (braking performance, water skid resistance, driving stability, noise reduction, etc.), complex patterns ( Mixed patterns, asymmetric patterns, etc.) demand increases, but the manufacturing technology level of tire molds limits the improvement of tire performance.

For the manufacture of tire molds, additive manufacturing technology has incomparable advantages over traditional processing technologies:

(1) Personalized production. Additive manufacturing usually serves single-piece small-batch production, which can meet individual needs and is time-sensitive. The new mold samples produced by it can be used for market exploration, which can not only save development costs, but also promote the further development and research of new molds.

(2) High processing precision. Traditional technology inevitably uses manual pre- and post-processing. For example, the aluminum alloy sheet on the mold needs to be manually inserted, and it is difficult to meet the interference requirements. The additive manufacturing machining production does not need to consider this problem, and ensures the shape accuracy, dimensional accuracy and position accuracy of the mold to a greater extent, as well as the consistency of surface quality. At the same time, it is easier to realize the processing of complex structures.

(3) The production cycle is short. Traditional mold manufacturing generally needs to go through design, production, trimming and other processes, while additive manufacturing technology directly generates entities based on 3D modeling data, and the design, modification and improvement processes are all completed in the computer, which can improve production efficiency and shorten production cycle .

(4) Low production cost. Additive manufacturing can save a lot of human resources and equipment resources. Although printing materials and equipment are currently more expensive, the overall cost of producing small batches of personalized tire molds will still be reduced.

Therefore, with the rapid development of additive manufacturing technology, it will be a future trend to use additive manufacturing technology to produce molds. However, there are still no relevant reports on using this technology to achieve reusability through the detachable design of the mould, thereby saving production costs. The manufacturing method of the reusable tire mold based on the additive manufacturing technology proposed by the invention fills up the gap in the prior art in the aspect of complex pattern forming.

Contents of the invention

The main technical problem to be solved by the present invention is to propose a new tire mold manufacturing method that can be quickly disassembled and assembled, so as to realize the formation of complex patterns, and the base body can be reused.

Generally, a complete tire mold produced by a mold factory will be divided into 8-10 pieces, and the pattern of each mold is different. Take one of the molds as an example to introduce its detachable and reusable functions, and the rest are the same.

The technical scheme adopted in the present invention is a reusable tire mold manufacturing method based on additive manufacturing technology, in which a single tire mold is processed in blocks, and a single tire mold is divided into an additive manufacturing body and a machining base, and the additive manufacturing The manufactured body is processed by the additive manufacturing process, the machined substrate is processed by the traditional manufacturing process, and the two are combined through mechanical connection, and finally the tire is formed.

In the first step, under the drive of 3D drawing software, high-power or high-brightness laser is used as the heat source to melt or feed metal powder layer by layer, so as to produce an additive manufacturing body with complex patterns.

In the second step, according to the drawings, the ring forging blank is machined through rough turning, heat treatment, semi-finish turning, rough milling, electrocutting, block cutting, vertical milling, air hole drilling, slot milling, turning holes, and surface treatment. The matrix ensures that the appearance of the vulcanization mold remains unchanged.

The third step is to use mechanical connection parts to combine the two and conduct a qualification inspection. On the basis of ensuring its assembly accuracy, its mechanical properties are guaranteed by tensile tests and other means.

In the fourth step, for tire molds with the same specifications and different patterns, use the method in the first step to re-produce the additive manufacturing body with other types of patterns; then disassemble the mechanical connection of the existing mold, and connect the original additive manufacturing body with the machine The processing base is separated; then the new additive manufacturing body is connected to the original machined base to assemble a monolithic overall mold, and then assembled into a complete set of molds.

Compared with the prior art, the present invention has the following beneficial effects.

The production process is more efficient, and it is more energy-saving and environmentally friendly than traditional processing methods; at the same time, it is more convenient and quick to vulcanize tires with different types of patterns, and the machined substrate can be reused, which saves manufacturing costs.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of a single detachable mold;

Fig. 2 is a schematic diagram of the structural form of the additive manufacturing body;

Fig. 3 is a cross-sectional view of an additively manufactured body;

Fig. 4 is a schematic diagram of the structure of the intermediate connector;

Fig. 5 is a cross-sectional view of an intermediate connector;

Fig. 6 is a schematic diagram of the structural form of the machined substrate;

Fig. 7 is a schematic diagram of the inner structure of the machined substrate;

Fig. 8 is a cross-sectional view of a machined substrate;

Figure 9 is a partial sectional view of the mechanical connection.

Fig. 10 is a flowchart of the implementation of the present invention.

In the figure: 1. Machining substrate, 2. Intermediate connecting body, 3. Additive manufacturing body, 4. Boss, 5. Connecting threaded hole, 6. Positioning threaded hole, 7. Connecting through hole, 8. Positioning through hole , 9, through groove, 10, groove, 11, through hole, 12, threaded hole, 13, step hole, 14, hexagon head screw, 15, positioning pin, 16, positioning plate, 17, hexagon head bolt.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

In order to make the connection between the additive manufacturing body and the machined substrate more interchangeable, an intermediate connector is added as a transition part between the two during specific implementation. The tire mold shown in this embodiment is specifically divided into three parts, namely the additive manufacturing body 1, the intermediate connecting body 2 and the machining base 3, and the additive manufacturing body 1, the intermediate connecting body 2 and the machining base are mechanically connected. 3 Assemble into a complete set of moulds, the mechanical connections are bolt or screw connections, and will be assembled into a single complete mould, as shown in Figure 1.

The structural design form of the additively manufactured body 1 of this embodiment is shown in FIG. 2 . Print complex patterns on the inside of the additive manufacturing body 1; print four bosses 4 with connecting threaded holes 5 on the outside of the additive manufacturing body 1, and the centerlines of the bosses 4 and the connecting threaded holes 5 point to the tire section circle respectively The center of the circle, see Figure 3; print two positioning threaded holes 6, see Figure 3.

The structural design form of the intermediate connecting body 2 in this embodiment is shown in FIG. 4 . The inner and outer surfaces of the intermediate connecting body 2 are closely attached to the additive manufacturing body 1 and the machined substrate 3 respectively, and four connecting through holes 7 are processed on the intermediate connecting body 2, as shown in Figure 5; two positioning through holes are processed, see Figure 5; the center lines of the connecting through hole 7 and the positioning through hole 8 respectively point to the center of the tire section circle, and the axial distance is the axial distance from the boss 4 of the additive manufacturing body 1, the connecting threaded hole 5, and the positioning threaded hole 6 be consistent.

The structural design form of the machined substrate 3 in this embodiment is shown in FIG. 6 . Process a through groove 9 inside the machined base body, as shown in Figure 7; process two grooves 10 outside the base body, see Figure 8; process a through hole 11 and two threaded holes 12 on the groove 10, see Figure 7 8. Process four stepped holes 13 on both sides symmetrically on the groove 10, as shown in Fig. 8, the centerlines of the stepped holes 13 point to the center of the tire cross-section circle respectively, and the axial distance is connected with the boss 4 of the additively manufactured body 1. The axial distance between the threaded hole 5 and the positioning threaded hole 6 is consistent.

The mechanical connection part of this embodiment is divided into two parts, one is to use hex head bolts 17 to connect the machined substrate 1, the intermediate connecting body 2, and the additive manufacturing body 3; the other is to use hex head screws 14 and positioning pins 15 , the positioning plate 16 will position the three, the hexagon head screw 14 will connect the positioning plate 16 with the machining substrate 1, and the positioning pin 15 will connect the positioning plate 16 with the machining substrate 1, the intermediate connecting body 2, and the additive manufacturing body 3, Make sure the connections are tight and concentric, as shown in Figure 9.

It should also be noted that what is listed above are only specific embodiments of the present invention. Apparently, the present invention is not limited to the above embodiments, and many variations are possible. Moreover, the additive manufacturing technology mentioned in the present invention is not limited to laser 3D printing technology, but also includes other additive technologies such as electron beam and sand casting. All deformations that can be directly derived or conceived by other persons of ordinary skill in the art from the content disclosed in the present invention should be considered as the protection scope of the present invention.

Claims (3)

1. A reusable tire mold manufacturing method based on additive manufacturing technology, characterized in that: a single tire mold is processed in blocks, a single tire mold is divided into an additive manufacturing body and a machined substrate, and the additive manufacturing The body is processed by the additive manufacturing process, the machined base is processed by the traditional manufacturing process, and the two are combined through mechanical connection, and finally the tire is formed; The first step is to use high-power or high-brightness laser as a heat source to melt or feed metal powder layer by layer under the drive of 3D drawing software, so as to produce an additive manufacturing body with complex patterns; In the second step, according to the drawings, the ring forging blank is machined through rough turning, heat treatment, semi-finish turning, rough milling, electrocutting, block cutting, vertical milling, air hole drilling, slot milling, turning holes, and surface treatment. The matrix ensures that the shape and appearance of the vulcanization mold remain unchanged; The third step is to use mechanical connection parts to combine the two and conduct a qualification inspection. On the basis of ensuring its assembly accuracy, its mechanical properties are guaranteed by means of tensile tests and other means; In the fourth step, for tire molds with the same specifications and different patterns, use the method in the first step to re-produce the additive manufacturing body with other types of patterns; then disassemble the mechanical connection of the existing mold, and connect the original additive manufacturing body with the machine The processing base is separated; then the new additive manufacturing body is connected to the original machined base to assemble a monolithic overall mold, and then assembled into a complete set of molds. 2. a kind of reusable tire mold manufacturing method based on additive manufacturing technology according to claim 1, is characterized in that: The tire mold is specifically divided into three parts, which are the additive manufacturing body (1), the intermediate connecting body (2) and the machined substrate (3). The additive manufacturing body (1), the intermediate connecting body (2) are mechanically connected Assembled with the machined base (3) to form a complete set of moulds, the mechanical connection is a bolt or screw connection, which will be assembled into a single complete mould; Print complex patterns on the inside of the additively manufactured body (1); print four bosses (4) with connecting threaded holes (5), bosses (4) and connecting threaded holes on the outside of the additively manufactured body (1) The center line of (5) points to the center of the tire section circle; print two positioning threaded holes (6); The inner and outer surfaces of the intermediate connector (2) are closely attached to the additive manufacturing body (1) and the machined substrate (3) respectively, and four connecting through holes (7) are processed on the intermediate connector (2); a positioning through hole; the center lines of the connecting through hole (7) and the positioning through hole (8) point to the center of the tire section circle respectively, and the axial distance is the same as that of the boss (4) and the connecting threaded hole of the additive manufacturing body (1) (5), the axial distance of the positioning threaded hole (6) remains consistent; Machining a through groove (9) inside the machined substrate; processing two grooves (10) outside the substrate; respectively processing a through hole (11) and two threaded holes (12) on the groove (10); Four stepped holes (13) are processed on both symmetrical sides of the groove (10), the centerlines of the stepped holes (13) point to the center of the tire cross-section circle, and the axial distance is the same as that of the boss (4) of the additive manufacturing body (1). , The axial distance between the connecting threaded hole (5) and the positioning threaded hole (6) is kept consistent. 3. a kind of reusable tire mold manufacturing method based on additive manufacturing technology according to claim 2, is characterized in that: The mechanical connection part is divided into two parts, one is to use hexagon head bolts (17) to connect the machined base (3), intermediate connecting body (2) and additive manufacturing body (1), and the other is to use hexagon head screws (14), locating pin (15), locating plate (16) will three be positioned, hex head screw (14) locating plate (16) is connected with machined substrate 1, locating pin (15) locating plate (16) ) is connected with the machined substrate (3), the intermediate connecting body (2), and the additive manufacturing body (1), so as to ensure that the connection is tight and concentric.