Manufacturing method of product for enhancing friction between connecting parts

Abstract

The invention discloses a manufacturing method of a product for enhancing friction between connecting parts, and belongs to the technical field of material surface treatment. The method is characterized in that a hard metal sheet is subjected to chemical plating, and hard wear-resistant particles and the hard metal sheet form a composite product through a four-step plating method; the hard wear-resistant particles are uniformly plated on the surface of the hard metal sheet by adopting a shakeout method, so that the particles are uniformly distributed; the upper surface and the lower surface of the hard metal sheet can be respectively plated with hard wear-resistant particles with different particle sizes; particles are uniformly distributed, the coating hardness is high, and the structure is compact; and the surface of the plated product is coated with a rubber sealing line, so that the product has a sealing function, and a sealing assembly does not need to be added.

Description

Technical Field

[0001] The invention relates to the technical field of material surface treatment, in particular to a method for manufacturing a product for enhancing friction between connecting parts. Background Art

[0002] Mechanical transmission is a key transmission method to ensure the normal operation of machinery. With the development of the industry, mechanical components are moving towards lightweight and compactness. The reduction in size of mechanical parts and the compact assembly space have reduced the number of bolts between connecting parts and reduced the clamping force. At this time, to ensure the normal output of power through mechanical transmission, it is necessary to increase the friction coefficient between the connecting parts, improve the reliability of power output, reduce the efficiency loss caused by slippage, and protect the bolts from being twisted off. At present, in order to increase the friction coefficient, the method of increasing the roughness by processing the texture on the metal surface is often used. Due to the low strength of the metal bonding surface, the texture is worn flat after long-term use, and the function fails. In addition, due to the increase in roughness after processing the texture, if liquid passes between the connecting parts, it will cause liquid leakage. Summary of the Invention

[0003] The object of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a method for manufacturing a product that increases friction between connecting parts.

[0004] The technical solution provided by the present invention is: a method for manufacturing a product for increasing friction between connecting parts, wherein the product is first cleaned and activated after being cut or punched out of a hard metal sheet, then evenly laid flat on a tool and fixed, and the tool is placed in a plating solution for chemical plating. The special feature of the method is that the chemical plating includes the following process steps: a. Place the tooling hanger into a plating solution without hard wear-resistant particles, so that the upper and lower surfaces of the activated product are plated as a bonding layer; b. After the plating solution containing hard wear-resistant particles is stirred, the tooling in step a is placed flat in the plating solution containing hard wear-resistant particles, and the falling sand method is used to make the hard wear-resistant particles in the plating solution fall evenly on the surface of the product; c. Rotate the fixture 180° so that the downward surface in step b faces upward, and use the falling sand method to make the hard wear-resistant particles in the plating solution fall evenly on the surface of the product; d. Place the tooling hanger into the plating solution without hard wear-resistant particles, continue plating, and evenly plate the composite coating on the upper surface and the lower surface of the product; After the electroless plating is completed, heat treatment is performed.

[0005] Furthermore, the hard wear-resistant particles have an area coverage of 5-50% on the surface of the product, and the particle size of the hard wear-resistant particles is 1 μm-55 μm.

[0006] Furthermore, the composite coating formed on the upper and lower surfaces of the product is coated with a rubber sealing line, so that the product has a sealing function.

[0007] Furthermore, the coated rubber sealing line is produced by silk screen printing.

[0008] Beneficial effects of the present invention: 1. The four-step chemical plating method is used to plate hard wear-resistant particles on the surface of hard metal. In particular, the falling sand method is used to effectively improve the uniformity of hard wear-resistant particles on the surface of hard metal sheets. In addition, hard wear-resistant particles of different particle sizes can be plated on the upper and lower surfaces as needed to meet the requirements of the connection surface material and roughness. The particles are evenly distributed, the coating has high hardness and a dense structure. 2. Used to connect components, it can increase the friction coefficient between the connected components and ensure effective power transmission under lightweight and compact conditions; the manufacturing method is simple, reliable and highly adaptable; 3. Apply rubber sealing line on the surface of the product to make the product have sealing function on the basis of high friction coefficient, reducing the use of sealing components. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a cross-sectional view of a product of the present invention; Figure 2 This is a schematic diagram of the flat tooling structure used in the present invention; Figure 3 is a planar distribution diagram of hard wear-resistant particles on the surface of the product of the present invention; Figure 4 This is a three-dimensional morphology diagram of the hard wear-resistant particles on the surface of the product of the present invention; Figure 5 It is a cross-sectional view of the product of the present invention after coating the rubber sealing line.

[0010] In the figure: 1 hard metal sheet, 2 composite coating, 3-1 upper surface of product, 3-2 lower surface of product, 4 fixed cross bar, 5 column, 6 fixed clamping block, 7 hard wear-resistant particles, 8 rubber sealing line. DETAILED DESCRIPTION

[0011] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings.

[0012] like Figure 1 、 2 , 3, 4, and 5, a method for manufacturing a product for increasing friction between connecting parts, firstly, a hard metal sheet 1 after cutting or stamping, i.e., the product, is cleaned and activated to remove the surface oxide layer, and then degreased by alkaline washing or electrochemical means to remove surface oil stains, and finally, the upper surface 3-1 and the lower surface 3-2 of the product are activated in an activation solution to improve the surface activity of the hard metal sheet; Place the activated hard metal sheets 1 evenly on the fixed crossbars 4 of the flat tooling through the uprights 5, with a certain distance between each hard metal sheet 1 and fixed with fixed clamps 6 to prevent it from falling off; After the fixation is completed, the flat plate fixture is placed in the plating solution and a four-step plating method is used to complete the chemical plating. The chemical plating process includes the following steps: In the first step, the flat tooling is placed in a plating solution without hard wear-resistant particles, so that the upper surface 3-1 and the lower surface 3-2 of the activated product are plated with a 3-5 μm coating as a bonding coating; In the second step, the plating solution containing hard wear-resistant particles is stirred to make the hard wear-resistant particles evenly suspended in the solution, and the flat tooling of the first step is placed flat in the plating solution containing hard wear-resistant particles, and the falling sand method is used to make the hard wear-resistant particles in the plating solution fall evenly on the surface of the product; In the third step, the tooling placed in the second step is rotated 180 degrees so that the downward surface in the second step faces upward, and the falling sand method is still used to make the hard wear-resistant particles in the plating solution fall evenly on the surface of the product; The hard wear-resistant particles have a surface coverage rate of 5-50% on the product, and the particle size of the hard wear-resistant particles is 1um-55um; In the fourth step, the flat tooling is placed in a plating solution without hard wear-resistant particles and the plating is continued. When more than 1 / 3 of the hard wear-resistant particles are embedded in the plating layer, the chemical plating is completed; the composite plating layer 2 is evenly plated on the upper surface 3-1 and the lower surface 3-2 of the product; After the plating is completed, the product is removed from the flat tooling, and then the product that has completed the chemical plating is placed in a high-temperature oven for heat treatment for 1-2 hours to eliminate the internal stress of the composite coating 2 and improve the density and hardness of the composite coating.

[0013] If the product of the present invention is to have a sealing function, a rubber sealing line 8 can be coated on the surface of the composite coating 2 formed on the upper and lower surfaces of the product by silk screen printing and then subjected to high temperature vulcanization; the rubber sealing line 8 is made of fluororubber material with a coating thickness of 10-30um.

[0014] The present invention provides a method for manufacturing a product for enhancing friction between connecting parts. The method comprises: using chemical plating to form a composite product by combining hard wear-resistant particles with a hard metal sheet; in the second and third chemical plating steps, hard wear-resistant particles of different particle sizes may be used; in the second step, a plating solution containing hard wear-resistant particles with a particle size of 25 μm is stirred to uniformly suspend the hard wear-resistant particles in the solution; a tool is placed horizontally in the plating solution, and a falling sand method is used to uniformly deposit the hard wear-resistant particles on the surface of the product; in the third step, the tool placed in the second step is flipped 180 degrees, with the downward surface in the second step facing upward, and placed in a plating solution containing hard wear-resistant particles with a particle size of 35 μm; the falling sand method is also used to uniformly deposit the hard wear-resistant particles on the surface of the product. Hard wear-resistant particles of different particle sizes can be selected according to different application requirements to improve the adaptability of the product.

[0015] It should be understood that all technical features not elaborated in detail in this specification belong to the prior art. Although the embodiments of the present invention are described, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Those skilled in the art can, under the guidance of the present invention, make more forms without departing from the scope of protection of the present invention and the claims, and all of these fall within the scope of protection of the present invention.

Claims

1. A method for manufacturing a product for increasing friction between connecting parts, wherein the product after cutting or punching of a hard metal sheet is first cleaned and activated, then evenly laid flat on a tool and fixed, and the tool is placed in a plating solution for chemical plating; characterized in that: The chemical plating comprises the following process steps: a. Place the tooling hanger into a plating solution without hard wear-resistant particles, so that the upper and lower surfaces of the activated product are plated with a coating as a bonding coating; b. After the plating solution containing hard wear-resistant particles is stirred, the tooling in step a is placed flat in the plating solution containing hard wear-resistant particles, and the hard wear-resistant particles in the plating solution are evenly dropped on the surface of the product by using the falling sand method; c. Rotate the tooling 180° so that the downward surface in step b faces upward, and use the falling sand method to make the hard and wear-resistant particles in the plating solution fall evenly on the surface of the product; d. Place the tooling hanger into the plating solution without hard wear-resistant particles, continue plating, and evenly plate the composite coating on the upper surface and the lower surface of the product; After the chemical plating is completed, heat treatment is performed.

2. The method for manufacturing a product for increasing friction between connecting parts according to claim 1, characterized in that: The hard wear-resistant particles have a surface area coverage of 5-50% on the product, and the particle size of the hard wear-resistant particles is 1um-55um.

3. The method for manufacturing a product for increasing friction between connecting parts according to claim 1, characterized in that: The composite coating surface formed on the upper surface and the lower surface of the product is coated with a rubber sealing line, so that the product has a sealing function.

4. The method for manufacturing a product for increasing friction between connecting parts according to claim 3, characterized in that: The coated rubber sealing line is applied by silk screen printing.

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