First, the working principle of the blade sharpening machine
Blade sharpening machine is a kind of grinding machine which makes use of grinding wheel face. Working principle: according to the appropriate grinding Angle of the blade, by adjusting the worktable, the grinding wheel is rotated at high speed to grind the blade steel to achieve a certain straightness and sharpness, and prolong the cutting time.
Second, The performance and selection of blade and grinding wheel, and the feed of grinding head during grinding
All kinds of blades are divided into hard alloy blades, alloy tool steels and high tool steels (front steel), which are different in dry hardness and wear resistance.
Three, Grinding wheel structure classification
Particle size: abrasive particle size, generally we choose between 46 and 60#. Too thick, grinding finish can not meet the requirements, but also easy to make the edge crack; If it is too fine, it is easy to burn the grinding surface and reduce the grinding efficiency.
Hardness: the industry blade is suitable for H, J, K(soft 2, soft 3, soft 1) three levels of selection. Too hard will burn the blade, too soft will consume too much waste. Hardness is inversely proportional to the hardness of the grinding material, that is to say, hard blade grinding wheel is soft, soft blade grinding wheel is hard.
Abrasives: The abrasive is the sand particles that make up the grinding wheel.
Shape: we usually choose cup and bowl shapes.

Four. Feed amount of grinding head during grinding:
The feed of the grinding head is directly related to the width of the inclined surface. Wide feed less, narrow feed more. There are “rough grinding” and “fine grinding” in the round trip, generally can be respectively grasped as:0.05mm, 0.01mm.
To sum up:
1. For grinding ordinary alloy-steel blades, it is recommended to choose white corundum grinding wheel with particle size of 60 and hardness of grade J. The feed of coarse grinding is controlled at 0.01mm-0.03mm/ stroke, and the feed of fine grinding is controlled at 0.005mm/ stroke.
2. For grinding high-speed tool steel (front steel) blades, it is recommended to choose brown corundum grinding wheel with particle size of 46 and hardness of K level, and the feeding amount is relatively reduced.
3. Grinding carbide blades can not be completed by general grinding wheels, and the grinding process is particularly required, so diamond grinding wheels must be used, the particle size is 180, and the feed amount is generally 0.01mm/ stroke.
Five, the choice of blade Angle and the correct grinding steps
The grinding angle of the blade has a direct influence on the cutting performance of the blade, which mainly depends on the material. There are several kinds of paper in common use, and their corresponding angles are:
1, soft paper (such as cigarette paper, carbon paper, etc.) industrial fabric, varnished cloth and cloth Angle of 17 degrees;
2. The Angle of cutting meat is 20 degrees;
3, smash and dense paper (such as copper board paper, writing paper, typing paper) is 19-23 degrees;
4. Insulation paper, transparent paper, polyester paper, fiber fabric and so on are about 19 degrees;
5, hard paper, glued paper and wood for 20 degrees – 30 degrees;
6, aluminum, tin, zinc and other metal film is about 26 degrees;
7, slitting machine used to throw the knife Angle of 75-85 degrees;
8. Other cutting tools may be determined according to the situation.
There are three kinds of working steps for the correct grinding of the edge slope to achieve the purpose, namely: rough grinding, fine grinding and smooth curing.
Rough grinding: the purpose of large feed is to remove the defect of the cutting edge. Remember: the amount of feed should not be too large so that the grinding surface can not produce light yellow or blue.
Fine grinding：is an important step of sharpening the knife, “uniform micro feed” and “sufficient cooling” are two key points. When grinding, a cooling liquid with a mixture ratio of “water and emulsified oil” of 30:1 must be used in the grinding area. It is sprayed directly on the grinding contact parts of the grinding wheel and the blade to fully cool the friction heat generated in the whole grinding process. It has three functions of cooling, rust prevention and lubrication.
Finishing maintenance: it refers to that the grinding wheel travels several times laterally without feed to improve the straightness of the cutting edge and improve the surface quality of the grinding edge. Generally, the blade of 1 meter length should go through 7~8 strokes, and the longer blade should go through more than 20 strokes to meet the requirements.
Six. Repair the knife, to the knife flower
Repair knife is the use of oil-soaked stone on the edge of the polished grinding to improve the cutting performance of the blade is a careful work. The purpose is to remove the burr produced by the blade edge after grinding machine processing, if not treated, the surface of the cut object will appear corrugated (commonly known as “knife flower “). The choice of stone must be fine, soft, smooth, general granularity in more than 600 mesh, the finer the better.

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