I remember three years ago, when I participated in the training of key teachers of NC major in Wuxi Vocational School, I went to a CNC machine tool factory in Suzhou for a week-long visit and training. During this period, I was most impressed by a manual technique that is more difficult than wood carving. On the solid CNC machine table, I can sculpt 0.01 to 0.001 cm with hand tools. At the time I was very puzzled, can they really improve the current machined surfaces by shoveling?

Because the surface of the workpiece after shoveling is obviously not as beautiful as the mechanical processing, after communicating with the operating technician, I gradually became interested in this art, let's call this craft an art! Because there are few related literature books about shoveling flowers in the market, I also made a simple combing through the introduction of some authors on the Internet, and introduced it!

Shoveling 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 manufacture other machine tools, but it can never reproduce a product that is more accurate than the original. Therefore, 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.

Shoveling is to shovel the two moving surfaces of the machine straight, flat, and evenly. The point-line surface formed by the shoveling when the CNC track slides helps the machine move accurately, and also allows the lubricant to play an intermediary function to avoid early wear and reduce the machine. Life span, ten people with the same height support the door panel to share the weight evenly. If someone squats down and does not bear the strength, others will be tired because of the concentration of weight...... The key to mechanical quality is reliability, and the key to reliability is accuracy and precision. The key is to shovel flowers. The key to the fact that the spade can beat the precision of the machine by hand is that there is no thermal deformation problem.

Learning shoveling must be internalized into spontaneous movements through countless exercises, and repeated fine-tuning postures thousands of times a day, 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 shoveling point and feet The center of gravity is matched to a smoother body memory.

The difference between the highest and the lowest track may be a tiny 0.01mm, or it may be 1mm. It is an uneven thing for you to make. If you all exert the same force, it will not be flat at all, so you will not have any strength when you go down. Similarly, shoveling flowers is not like ordinary art sculptures, as long as one place is not accurate, it will affect the precision of other places. In addition, there are not only one plane, but four or more of them must be shoveled accurately at the same time. The difficulty of one more surface is not addition, but multiplication. Shoveling can only be digged out and cannot be repaired. Once the wrong place is shoveled, it must be done from the beginning. Everything else is done in vain, and the difficulty lies here.

Finally, briefly introduce the working principle of shoveling! First, apply the color developer (usually red lead powder or blue lead powder) on the standard fixture (flat plate or straight gauge fixture when shoveling the V-rail). The coating must be thin and uniform, and the thickness is less than 0.005mm. It is advisable to rub the standard jig coated with color developer on the track surface to be shoveled, and the color developer will be transferred to the high point of the track surface, and then use a special shovel tool to make the color high Point eradication. This action must be repeated until the track surface shows a uniform transfer. The shoveling master will generally strive to reach the standard of 25 points per square inch to greatly ensure the flatness and running-in of the contact surface.

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