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Steel back press-fit pretreatment process method

A process method and pre-treatment technology, applied in hot-dip plating process, metal material coating process, manufacturing tools, etc., can solve problems such as the lack of proper protection of the surface of the steel back, the inability to continue the manufacture of parts, and the pitting in the processing process. , to achieve the effect of improving the bonding effect, good performance and improving the fixing strength

Pending Publication Date: 2022-03-29
安徽瑞荣汽车零部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manufacture of components will not continue and may even have to be scrapped
The pre-treatment process of steel back pressing is an important process in the manufacturing process of brake pads. In the manufacture of the above-mentioned parts, because the surface layer of the steel back is not properly protected, it is easy to rust during the process of circulation and storage. A series of treatments are carried out on the back. Chinese patent CN110004402A discloses a surface anti-corrosion treatment process for brake steel backs used in motor vehicles. The brake steel backs after heat preservation are cooled, cleaned and lubricated. Although the oiling can isolate the air from corrosion, the steel backs are also The re-introduction of oil stains will cause pitting in the subsequent processing procedures, and the steel back still needs to be cleaned again during the pressing process. The Chinese patent CN111609058A is a method for treating the steel back of the brake pad by spraying wet glue on the surface of the steel back, spraying Glue, spray paint, etc. are not conducive to the subsequent lamination process, such as sintering and lamination of lead bronze-steel back bimetallic anti-friction materials, and the treatment of brake product glue spraying is not the process before lamination, nor does it belong to the stamping workshop In summary, the purpose of the pre-pressing treatment of the steel back is to serve the subsequent pressing process. It does not include the steps of the pressing process, and can play the role of anti-corrosion and cleaning, so as to facilitate the subsequent pressing process to prepare automobiles. components, and can promote the effect of lamination. At present, people mainly focus on the development of friction materials or anti-friction lubricant materials on the steel back. There are few related technologies for the pre-treatment of steel back lamination. Pretreatment has a prominent impact on production efficiency and production quality. Those skilled in the art urgently need to develop a pretreatment method for steel back pressing

Method used

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Effect test

Embodiment 1

[0021] The first step, annealing, the annealing process is to keep warm at 625°C for 20 minutes; the second step, polishing, the polishing process is sandblasting, and the sandblasting process of FC2-8 sandblasting machine is: nozzle diameter 0.5m, pressure 0.5MPa, distance It is 500mm, the gun speed is 0.5m / s, and the particle size of quartz sand is 80 mesh; the third step, electroless plating, the plating solution composition used in electroless plating is copper pyrophosphate 20g / L, sodium citrate 135g / L, tartaric acid Potassium sodium 42g / L, sodium dihydrogen phosphate 15g / L, potassium nitrate 5g / L, pH9, bath temperature 40°C, current density 1.5A / dm 2 , electroplating at 25°C with a stirring speed of 15r / min for 10min, the reagents used in the plating solution are analytically pure, the water used is deionized water, and the thickness is 5.8μm; the fourth step is hot-dip copper plating, the hot-dip copper plating process is steel back pre- The heating temperature is 700°C...

Embodiment 2

[0024]First, annealing, the annealing process is 640 ℃ heat preservation for 60 minutes; second, polishing, the polishing process is sandblasting polishing, in which the FC2-8 sandblasting machine sandblasting process is: nozzle diameter 0.6cm, pressure 0.6MPa, distance 600mm, walk The speed of the gun is 0.6m / s, and the particle size of quartz sand is 100 mesh; then, electroless plating, the plating solution composition that electroless plating adopts is copper pyrophosphate 20gL, sodium citrate 140g / L, potassium sodium tartrate 43g / L, diphosphate Sodium hydrogen 20g / L, potassium nitrate 4g / L, pH 12, bath temperature 80°C, current density 1.5A / dm 2 , 25 ℃ stirring speed 20r / min electroplating 20min, the reagents used in the plating solution are all analytically pure, the water used is deionized water, the thickness is 5.7μm; then, hot-dip copper plating, the hot-dip copper plating process is the preheating temperature of the steel back 800°C, copper bath immersion temperature...

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Abstract

The invention belongs to the technical field of steel backing production, and particularly relates to a steel backing press-fit pretreatment process method, in which a quick-drying adhesive adopts chemical plating and hot-dip copper plating, the press-fit bonding strength is improved through a copper coating, a copper layer is plated on a steel backing frame through chemical plating, the uniformity of hot-dip copper plating is improved, and the steel backing is subjected to hot-dip copper plating. The bonding strength between the steel backing and a copper substrate after pressing can be remarkably improved, the problems of material overflowing in the pressing process of the steel backing and burrs and burrs in the stamping process of the steel backing can be solved through the polishing procedure, the secondary cleaning procedure is added and adverse effects are brought to the product quality in the previous treatment methods adopting a lubricant, sizing and the like, and after silane surface treatment, the product quality is greatly improved. And the silane treatment layer can obviously reduce the corrosion potential and the corrosion current density and increase the polarization resistance, so that the corrosion resistance is improved, the steel backing is prevented from being rusted during transportation and storage, and the subsequent pressing process is not influenced.

Description

technical field [0001] The invention belongs to the technical field of steel back production, in particular to a pretreatment process for steel back pressing. Background technique [0002] Sintered friction materials or sintered anti-friction lubricating materials require steel backs, which are widely used in auto parts. Sintered friction material is not strong enough, especially when subjected to impact loads. Therefore, when manufacturing parts of this thickness, it must be reinforced with a metal backing with good strength. For example, brake pads are generally composed of steel plates, adhesive insulation layers, and friction blocks. Steel plates are also called steel backs. To produce steel backs for automobile brake pads, hot-rolled steel coils are purchased and cut to length by flattening and cutting, and finally stamped for automobile brake pads. Surface defects such as indentations and pits on the surface of the split plate require zero defects, and the steel back...

Claims

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Application Information

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IPC IPC(8): C23C18/40C23C18/18C23C2/04C23C2/26C23C2/40C23C22/34C23C22/68C23C28/02C25D3/38C25D7/00B24C1/08B24C5/04B24C11/00
CPCC23C18/40C23C18/1806C23C18/1803C23C2/04C23C2/40C23C2/26C23C22/68C23C22/34C23C28/023C25D3/38C25D7/00B24C1/08B24C1/083B24C5/04B24C11/00
Inventor 戴金宝
Owner 安徽瑞荣汽车零部件有限公司