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For two hundred years, the metal processing technique, which machines can never replace flowers, has been more of an art.
I remember that three years ago, when I participated in the training of key teachers of the NC major at Wuxi Vocational School, I went for a one-week visit and training at a CNC machine tool factory in Suzhou. At that time, I was most impressed by a manual technique that is more difficult than carving wood. On the massive CNC machine table, I can shape with hand tools from 0.01 to 0.001 cm. At the time, when I was very confused, can they really improve the currently processed surfaces by scraping?
Since the surface of the workpiece after scraping is obviously not as beautiful as mechanical processing, I gradually became interested in this art after communicating with the process technician. Let's call this craft an art! Since there are only a few related literature books on flower scraping in the market, I also simply combed through and introduced some authors on the internet!
Scraping is a metal processing technique that has been passed down from the industrial revolution two hundred years ago and cannot be replaced by machines. It does not require other machine tools and can eliminate the deviation caused by clamping force and heat. This is the first machine in the world. Technology is produced. This is because the purpose of the machine tool is to make other machine tools, but it can never reproduce a product that is more accurate than the original. So if you want to make a machine that is more accurate than the original machine, it is still better. No hand tools! So where did the accuracy of the first machine come from? It must come from a more precise machine or rely on another method that can produce a truly flat surface.
In scraping, the two moving surfaces of the machine are scraped straight, flat, and evenly. The point line surface formed by scraping during the sliding of the CNC rail helps the machine to move accurately and allows the lubricant to play an intermediate function to avoid early wear and reduce the machine's lifespan. Ten people of the same size support the door panel to distribute the weight evenly. If someone squats and cannot withstand the force, others will be tired due to the concentration of weight. The key to mechanical quality is reliability, and the key to reliability is accuracy and precision. The key is to scrape flowers. The key to the fact that the scraper can exceed the precision of the machine by hand is that there is no thermal deformation problem.
Learning to scrape must be internalized through countless exercises and thousands of repeated fine-tunings in spontaneous movements to master the waist strength to control the length and width, the left hand and downward pressure to determine the depth, and the right hand to control the scraping point and the feet. The focus is adjusted to a more uniform body memory.
The difference between the highest and lowest track can be as tiny as 0.01 mm or 1 mm. It is an unequal thing for you to do. If you all exert the same force, it is not flat at all, so you have no strength when descending. Similarly, scraping flowers is not like ordinary art sculptures. As long as one place is not accurate, it affects the precision of other places. Moreover, there is not just one plane, but four or more must be scraped accurately at the same time. The difficulty of another surface is not addition, but multiplication. Scraping can only be excavated and cannot be repaired. Once the wrong place is scraped, it must be done from the beginning. Everything else will be in vain, and the difficulty lies here.
Finally, let me briefly introduce the functional principle of scraping! First, apply the color developer (usually red lead powder or blue lead powder) to the standard device (flat plate or straight measuring device when scraping the V-rail). The coating must be thin and even, with a thickness of less than 0.005 mm. It is advisable to rub the standard device coated with color developer on the rail surface to be scraped, and the color developer will be transferred to the highest point of the rail surface, and then use a special scraping tool to carry out the color high point eradication. This action must be repeated until the rail surface shows a uniform transfer. The scraping master generally strives to reach the standard of 25 points per square inch to ensure the flatness and the running-in of the contact surface to a high degree.
Do you believe that scraping will be replaced by machines in the future? Everyone is welcome to leave a message in the comment area and share with the editor!