1. Rough scraping: If the surface of the clamping plate is rough, processing marks are deep, or the surface is rusty, uneven or twisted, and the scraping allowance is more than 0.005mm, rough scraping should be done first. The characteristics of rough scraping are the use of a long scraper, the stroke length (between 10mm and 15mm), a wider knife mark (10mm), and the scraper marks are in the same direction, and the pieces are not repeated. After the tool marks of the cast iron platform machining are hung off, the points can be researched and scraped according to the displayed high points.

 

2. Fine scraping: Fine scraping is to scrape off the high points after rough scraping. It is characterized by the short scraping method (the width of the knife mark is about 6mm and the length of 5mm~10mm), and the grinding points are dispersed quickly. When scraping finely, scrape in some directions. After scraping, scrape out the net pattern in 45 degrees or 60 degrees crosswise. When the average research point is 10~14 points per 25㎡×25㎡, the fine scraping can be finished.

　　

3. Fine scraping: Fine scraping is performed on the basis of fine scraping, using a small scraper or a fine scraper with an arc, the width of the knife mark is about 4mm, and the average grinding point should be 20-25 points per 25㎡×25㎡.

　　

4. Scratching: The function of scratching is aesthetics and the function of accumulating lubricating oil. Common patterns are: diagonal pattern, swallow pattern and fish scale pattern.

 

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