Manufacturing method of hard alloy laser cladding coating brake disc based on gray cast iron base material

Abstract

The invention discloses a manufacturing method of a hard alloy laser cladding coating brake disc based on a gray cast iron base material, and relates to the technical field of brake discs. The manufacturing method of the hard alloy laser cladding coating brake disc based on the gray cast iron base material comprises the following specific operation steps that S1, a gray cast iron blank casting part is purchased, and the gray cast iron blank casting part is machined to obtain a semi-finished brake disc; and S2, induction heating is conducted on the semi-finished brake disc. According to the manufacturing method of the hard alloy laser cladding coating brake disc based on the gray cast iron base material, through improvement of technological parameters, on the premise that the manufacturing cost and the strength are guaranteed, the abrasion resistance of a product is greatly improved, it can be well guaranteed that the brake disc does not need to be replaced all the time under the non-special condition, and meanwhile the service life of the brake disc is prolonged. Equipment required for improvement is based on existing equipment and is a combination of the existing equipment, so that the improvement cost is reduced to a great extent, and the method is suitable for large-scale improvement.

Description

Technical Field

[0001] This invention relates to the field of brake disc technology, specifically to a method for manufacturing a hard alloy laser cladding coated brake disc based on a gray cast iron substrate. Background Technology

[0002] Brake discs are the braking devices used for braking and emergency braking in automobiles. Automobile braking methods can be divided into disc brakes and drum brakes. Disc brakes have better heat dissipation than drum brakes and are less prone to heat fade under high-speed braking conditions, so they have better high-speed braking performance. Disc brakes are mainly composed of brake calipers and brake discs, among which the brake disc is a round disc and is the key to braking.

[0003] In the existing technology, as vehicle performance improves, the performance requirements for brake discs also increase. The requirements for the strength, toughness, and wear resistance of brake discs are gradually increasing. The parameters used in brake disc manufacturing largely determine the performance of the brake discs. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a method for manufacturing a hard alloy laser cladding coated brake disc based on a gray cast iron substrate, thus solving the problems existing in the prior art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a method for manufacturing a hard alloy laser cladding coated brake disc based on a gray cast iron substrate, the specific operation of which is as follows: Step S1: Purchase gray cast iron blank castings and machine them to obtain semi-finished brake discs. Step S2: Induction heating is applied to the semi-finished brake disc; Step S3: 430L stainless steel powder is clad onto the braking surface of the brake disc using a high-energy laser beam, with a coating thickness of 70-200um, thereby obtaining a semi-finished brake disc with a transition layer; Step S4: Metallize TiC powder by sintering to form spherical TiC-FeCr powder; Step S5: The spheroidized TiC-FeCr powder is mixed with 430L stainless steel powder at a ratio of 10%-40% and then clad onto the 430L stainless steel surface using a high-energy laser beam to obtain a brake disc semi-finished product with a hard alloy cladding coating. Step S6: Use an air-cooling device to cool the carbide-coated brake disc to 30-50°C; Step S7: Grind the cooled carbide-coated brake disc using a special double-end grinding machine to obtain the finished carbide-coated brake disc.

[0006] Preferably, in step S2, the heating temperature range is 200-350℃.

[0007] Preferably, in step S4, the particle size of the spherical TiC-FeCr powder is 10-60 μm.

[0008] Preferably, in step S7, the coating thickness of the finished carbide-coated brake disc is 100-300 μm, and the hardness of the finished carbide-coated brake disc must be within the range of 400-800 HV0.3.

[0009] Preferably, in step S4, TiC powder is coated with FeCr material to form spherical TiC-FeCr, and the mass percentage of FeCr in the mixed powder is 0-1.2%.

[0010] (III) Beneficial Effects This invention provides a method for manufacturing a hard alloy laser cladding coated brake disc based on a gray cast iron substrate. It has the following advantages: This method for manufacturing a hard alloy laser cladding coated brake disc based on gray cast iron substrate, through the improvement of process parameters, greatly enhances the wear resistance of the product while ensuring manufacturing cost and strength. It can ensure that the brake disc does not need to be replaced for its entire life under normal circumstances. At the same time, the equipment required for the improvement is based on existing equipment and is a combination of existing equipment, thus greatly reducing the cost of the improvement and making it suitable for large-scale improvement. Attached Figure Description

[0011] Figure 1 Metallographic photographs of the product of this invention; Figure 2 Metallographic photographs in the prior art; Figure 3 This is a diagram comparing product parameters. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Please see Figure 1-3This invention provides a technical solution: a method for manufacturing a hard alloy laser cladding coated brake disc based on a gray cast iron substrate, the specific operation of which is as follows: Step S1: Purchase gray cast iron blank castings and machine them to obtain semi-finished brake discs. Step S2: Induction heating is applied to the semi-finished brake disc, with a heating temperature range of 200-350℃; Step S3: 430L stainless steel powder is clad onto the braking surface of the brake disc using a high-energy laser beam, with a coating thickness of 70-200um, thereby obtaining a semi-finished brake disc with a transition layer; Step S4: Metallize TiC powder by sintering to form spherical TiC-FeCr powder. The particle size of the spherical TiC-FeCr powder is 10-60 μm. TiC powder is coated with FeCr material to form spherical TiC-FeCr. The mass percentage of FeCr in the mixed powder is 0-1.2%. Step S5: The spheroidized TiC-FeCr powder is mixed with 430L stainless steel powder at a ratio of 10%-40% and then clad onto the 430L stainless steel surface using a high-energy laser beam to obtain a brake disc semi-finished product with a hard alloy cladding coating. Step S6: Use an air-cooling device to cool the carbide-coated brake disc to 30-50°C; Step S7: Grind the cooled carbide-coated brake disc using a special double-end grinding machine to obtain the finished carbide-coated brake disc. The coating thickness of the finished carbide-coated brake disc is 100-300um, and the hardness range of the finished carbide-coated brake disc must be 400-800HV0.3.

[0014] In summary, the manufacturing method of the hard alloy laser cladding coating brake disc based on gray cast iron substrate, through the improvement of process parameters, greatly enhances the wear resistance of the product while ensuring manufacturing cost and strength. It can well ensure that the brake disc does not need to be replaced for its entire life under special circumstances. At the same time, the equipment required for the improvement is based on existing equipment and is a combination of existing equipment, thus greatly reducing the improvement cost and making it suitable for large-scale improvement.

[0015] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0016] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a brake disc with a hard alloy laser cladding coating based on a gray cast iron substrate, characterized in that: The specific steps are as follows: Step S1: Purchase gray cast iron blank castings and machine them to obtain semi-finished brake discs. Step S2: Induction heating is applied to the semi-finished brake disc; Step S3: 430L stainless steel powder is clad onto the braking surface of the brake disc using a high-energy laser beam, with a coating thickness of 70-200um, thereby obtaining a semi-finished brake disc with a transition layer; Step S4: Metallize TiC powder by sintering to form spherical TiC-FeCr powder; Step S5: The spheroidized TiC-FeCr powder is mixed with 430L stainless steel powder at a ratio of 10%-40% and then clad onto the 430L stainless steel surface using a high-energy laser beam to obtain a brake disc semi-finished product with a hard alloy cladding coating. Step S6: Use an air-cooling device to cool the carbide-coated brake disc to 30-50°C; Step S7: Grind the cooled carbide-coated brake disc using a special double-end grinding machine to obtain the finished carbide-coated brake disc.

2. The method for manufacturing a hard alloy laser cladding coated brake disc based on a gray cast iron substrate according to claim 1, characterized in that: In step S2, the heating temperature range is 200-350℃.

3. The method for manufacturing a hard alloy laser cladding coated brake disc based on a gray cast iron substrate according to claim 1, characterized in that: In step S4, the particle size of the spherical TiC-FeCr powder is 10-60 μm.

4. The method for manufacturing a hard alloy laser cladding coated brake disc based on a gray cast iron substrate according to claim 1, characterized in that: In step S7, the coating thickness of the finished carbide-coated brake disc is 100-300 μm, and the hardness of the finished carbide-coated brake disc must be within the range of 400-800 HV0.

3.

5. The method for manufacturing a hard alloy laser cladding coated brake disc based on a gray cast iron substrate according to claim 1, characterized in that: In step S4, TiC powder is coated with FeCr material to form spherical TiC-FeCr, and the mass percentage of FeCr in the mixed powder is 0-1.2%.

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