How to solve common problems in polishing

(1) Excessive polishing

The biggest problem encountered in the daily polishing process is "overpolishing", which means that the longer the polishing time, the worse the quality of the mold surface. There are two phenomena of over-polishing: "orange peel" and "pitting". Excessive polishing occurs mostly in mechanical polishing.

(2) Reasons for "orange peel" in the workpiece

The irregular and rough surface is called "orange peel". There are many reasons for "orange peel". The most common reason is due to overheating of the mold surface or excessive carburization. For more CNC knowledge, pay attention to the WeChat public account (CNC programming). Teaching), too much polishing pressure and too long polishing time are the main reasons for "orange peel". For example: polishing the Polishing wheel, the heat generated by the polishing wheel can easily cause "orange peel". Harder steel can withstand greater polishing pressure, while relatively soft steel is prone to over-polishing. Studies have shown that the time for over-polishing varies depending on the hardness of the steel.

(3) Measures to eliminate the "orange peel" of the workpiece

When it is found that the surface quality is not good, many people increase the polishing pressure and prolong the polishing time, which often makes the surface quality worse.

The following methods can be used to remedy:

1) Remove the defective surface, grind the particle size a little coarser than the previous sand number, and then grind it, and the polishing force is lower than the previous one.

2) Perform stress relief at a temperature of 25°C lower than the tempering temperature, and use the finest sand number for grinding before polishing until a satisfactory effect is achieved, and finally polish with a lighter force.

(4) The reason for the formation of "pitting" on the surface of the workpiece

Due to some non-metallic impurities in the steel, usually hard and brittle oxides, they are pulled out from the steel surface during the polishing process to form micro-pits or pitting corrosion. The main factors that produce "pitting corrosion" are as follows:

1) The polishing pressure is too large and the polishing time is too long.

2) The purity of the steel is not enough, and the content of hard impurities is high.

3) The mold surface is rusted.

4) The black leather is not removed.

(5) Measures to eliminate pitting corrosion of workpieces

1) Carefully re-grind the surface, the sand grain size is slightly coarser than the one used previously, and use a soft and sharp whetstone for the final step of grinding before proceeding with the polishing process.

2) When the grit size is less than 1 mm, the softest polishing tool should be avoided.

3) Use the shortest polishing time and minimum polishing force as possible.

The polishing of the cavity in the mold manufacturing process is a very important process, which is related to the quality and life of the mold, and also determines the quality of the product. Mastering the working principle and process of polishing and choosing a reasonable polishing method can improve the quality and life of the mold, and then improve the quality of the product.

Jiangmen Gude Polishing Equipment Co., Ltd. established in 2010,We are a Polishing materials manufacturer focused on research and develop,produce and sell all kinds of Polishing Compound, buffing wheels, and accessories,After 13 years development,own 2 subsidiary of a factory and our factory has passed ISO9001 quality management system cetification and Midea audit.

We produce and sell polishing compound for metal ,wooden,musical instrument,furniture,Car paint surface etc,And all matching polishing wheels.We continuously optimize the formula to make the product use with better cutting force and faster brightness.

We also produce other polishing waxes and polishing agents, together with Sisal Polishing Wheel and Cotton Polishing Wheel. In addition, we also produce non-woven polishing, turnover wheel, abrasive belt, etc.

Three factroies are more than 10000 square meters,production capacity and delivery time could fully meet customer's request.We provide ODM and OEM for global super markets,importers,agents ,distributors and Amazon retailers.Products with REACH/ROHS certificates and so on.
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