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Surface treatment method of vehicle brake caliper piston

A surface treatment and vehicle braking technology, applied in the chemical field, can solve the problem of unsatisfactory salt bath compound treatment, etc., and achieve the effect of easy handling and easy collection

Active Publication Date: 2019-11-29
浙江百达精工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of ecology and environmental protection, QPQ salt bath composite treatment is not ideal enough

Method used

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  • Surface treatment method of vehicle brake caliper piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The process sequence steps of the vehicle brake caliper piston surface treatment method are as follows:

[0018] The first step of pre-processing: firstly, the opening of the caliper piston is facing down and clamped on the fixture. There should be a distance of 10mm to 20mm between two adjacent caliper pistons.

[0019] Then put the clamp and the caliper piston into the water-based cleaning agent, and use ultrasonic cleaning to peel off the dirt on the surface of the caliper piston.

[0020] Finally, put it into a heat treatment furnace after being controlled to dry.

[0021] The second step is pre-oxidation in air: heat the caliper piston to 350°C and keep it warm for 30 minutes; during this process, air can be allowed to enter the furnace naturally, or air can be introduced into the furnace.

[0022] The third step of nitrocarburizing: Heating the caliper piston to 500°C and holding it for 3 hours. During the holding period, pass ammonia gas into the furnace and dro...

Embodiment 2

[0026] The process sequence steps of the vehicle brake caliper piston surface treatment method are as follows:

[0027] The first step of pre-processing: firstly, the opening of the caliper piston is facing down and clamped on the fixture. There should be a distance of 10mm to 20mm between two adjacent caliper pistons.

[0028] Then put the clamp and the caliper piston into the water-based cleaning agent, and use ultrasonic cleaning to peel off the dirt on the surface of the caliper piston.

[0029] Finally, put it into a heat treatment furnace after being controlled to dry.

[0030] The second step is pre-oxidation in air: heat the caliper piston to 400°C and keep it warm for 40 minutes; during this process, air can be allowed to enter the furnace naturally, or air can be introduced into the furnace.

[0031] The third step of nitrocarburizing: Heating the caliper piston to 570°C and holding it for 2 hours. During the holding period, feed ammonia gas into the furnace and dro...

Embodiment 3

[0035] The process sequence steps of the vehicle brake caliper piston surface treatment method are as follows:

[0036] The first step of pre-processing: firstly, the opening of the caliper piston is facing down and clamped on the fixture. There should be a distance of 10mm to 20mm between two adjacent caliper pistons.

[0037] Then put the clamp and the caliper piston into the water-based cleaning agent, and use ultrasonic cleaning to peel off the dirt on the surface of the caliper piston.

[0038] Finally, put it into a heat treatment furnace after being controlled to dry.

[0039] The second step is pre-oxidation in air: heat the caliper piston to 450°C and keep it warm for 50 minutes; during this process, air can naturally enter the furnace, or air can be introduced into the furnace.

[0040] The third step of nitrocarburizing: Heating the caliper piston to 600°C and holding it for 1 hour. During the holding period, feed ammonia gas into the furnace and drop formamide as ...

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Abstract

The invention provides a surface treatment method for a brake caliper piston of a vehicle, and belongs to the technical field of chemistry. The surface treatment method for the brake caliper piston ofthe vehicle solves the problem that an existing method for manufacturing the brake caliper piston of the vehicle is not environmentally friendly. The surface treatment method for the brake caliper piston of the vehicle comprises the steps that 1, pre-treatment is performed; 2, pre-oxidation in air is performed; 3, nitrocarburizing is performed, specifically, the caliper piston is heated to a temperature of 500-600 DEG C, heat preservation is performed for 1-3 hours, ammonia gas is introduced and the formamide is dropped into a furnace during the heat preservation; 4, oxidation is performed, specifically, the temperature of the caliper piston is adjusted to 540-570 DEG C, the heat preservation is performed for 40-60 minutes, and oxygen is introduced into the furnace during the heat preservation; and 5, cooling is performed. According to the surface treatment method for the brake caliper piston of the vehicle, the ammonia gas and the formamide of required raw materials are low in toxicity and easily miscible with water and ethanol, and the advantages that exhaust gas is easy to collect and a tail gas treatment solution is easy to handle are achieved; and therefore, the surface treatment method for the brake caliper piston of the vehicle is more environmentally friendly.

Description

technical field [0001] The invention belongs to the chemical field, and relates to a metal surface chemical treatment method, in particular to a vehicle brake caliper piston surface treatment method. Background technique [0002] Brake calipers are one of the core components of the braking system. Brake calipers are widely used in vehicles to generate braking force through the interaction between brake calipers and brake discs. Brake calipers are usually fixed to the frame of the vehicle. The disc is fixed to the wheel. The brake caliper consists of pistons and brake pads, which slide in the support under the action of pressurized fluid, and then push the brake pads and brake discs to generate braking force in a frictional manner. Related documents about the brake caliper are such as the brake caliper recorded in the Chinese patent literature (authorized notification number CN101595324B). [0003] The caliper piston and the corresponding oil cylinder are closely matched, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/34C23C8/30
CPCC23C8/30C23C8/34
Inventor 阮吉林张启斌史红立
Owner 浙江百达精工股份有限公司
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