Correction of housing bore

Source: China Bearing Network Time: 2018-07-27

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A factory is processing a bearing hole 30H7 (data is cast iron) on a batch of equipment; because the worker neglects; when adjusting the tool; the scale is increased by 0. 2mm, causing the whole batch of workpieces to become waste; It has arrived; the factory is facing a critical moment of compensation for breach of contract; we have adopted the method of external coating to recover the shaft hole scale; it has become a top priority for the factory.
The correction process for the housing bore is as follows:
1. Removal, degreasing: treat the surface and adjacent parts; remove the oil with acetone.
2. Use a clear insulating tape paper to stick on both sides of the surface to be plated; the protective effect; to prevent unnecessary electrochemical reactions.
3. Electric net disposal: the net cleaning of the inner hole is cleaned by the electric cleaning liquid. The workpiece is connected to the negative pole; the voltage is 10V, the machine speed is 120r/min; the time is about 30s-1min.
4. Activation treatment: Activate the No. 2 activation solution; the workpiece is connected to the positive electrode; the voltage is 10V, the rotation speed is the same as above; when the appearance shows a uniform black carbon layer, it can be stopped; the time is about half a minute; the water is washed away, and then activated by the third activation liquid; Black is removed; the embodiment is exposed in silvery gray; the water is washed away; then it is plated.
5. The bottom layer is plated with alkali copper; the workpiece is connected to the negative electrode; the voltage is 10V, and the rotation speed is 120r/min.
6. The plated speed nickel is used as the scale layer: the workpiece is connected to the negative electrode; the voltage is 10V, the rotation speed is 120r/min to the regular scale; the residual amount for grinding is 0. 03mm.
7. Post-plating treatment: the regular scale and appearance roughness requirements after grinding and plating.

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