How to use the sharpening wheel correctly

 

The cutting performance of mechanical inserts depends to a large extent on the sharpening quality of the insert. The quality of the sharpening depends on the choice of sharpening equipment, the choice of grinding wheel, the choice of sharpening amount and the reasonable sharpening process.

Sharpening equipment - the choice of sharpening machine. For the cutting of the mechanical inserts for long cutters, we propose that you use the grinding head-type spindle sharpener with the grinding wheel end face sharpening shown.

In order to avoid burn grinding surface during sharpening, please adjust the grinding head axis, which is the working surface of the grinding wheel inclined 10 ˊ to 30 相对 relative to the sharpening surface . If you use a horizontal shaft sharpening machine for grinding, you must have a master with rich experience to operate, because the angle of the knife edge is difficult to master.

First, the choice of grinding wheel:

1. Abrasives for grinding wheels:

We propose that you use white corundum (code WA ) because this kind of abrasive is not easy to heat when it is sharp and sharp, and then choose brown corundum (code OA ) or chrome corundum (code PA ).

2 , the grinding wheel particle size:

We propose that you choose 46# ~ 60# . The abrasive grains of the grinding wheel are too thick, the sharpness of the sharpening is not up to the requirement, and the cutting edge is easy to be cracked; when it is too thin, the surface of the sharpening is easily burned, and the sharpening efficiency is also low.

3 , the hardness of the grinding wheel:

We propose that you choose one of the three types of H , J , and K that are softer . If the grinding wheel is too hard, it will burn the surface of the sharpening surface; while the grinding wheel is too soft, the grinding wheel will quickly consume waste.

The hardness of the grinding wheel should be inversely proportional to the hardness of the material to be ground. That is to say, if you choose the blade with a high blade hardness, the grinding wheel with H hardness should be used . Otherwise, the grinding wheel with K hardness should be used.

4 , the binder of the grinding wheel:

We recommend that you use a resin binder (code B ). If you use a cup wheel, you can also use a ceramic adhesive (code V ). When using a resin-coated grinding wheel, please be careful not to use alkaline cutting fluid at the same time, otherwise the adhesive will be broken down and destroyed, which will affect the robustness of the grinding wheel.

Second, the recommended amount of sharpening:

1. The peripheral speed of the grinding wheel: V=15 ～ 25m / s ( m / s )

2. The moving speed of the grinding head and the workpiece: Vt=5 ～ 15 m /min ( m / min )

3 , grinding head feed:

The grinding depth is related to the width of the sharpened bevel (the flank), the width is less and the feed is narrower.

Generally, the initial coarse grinding is mastered at 0.012mm/str ( mm / stroke ) , and the fine grinding is mastered at 0.005 mm/str ( mm / stroke ) .

Third, the grinding process requirements:

1. Grinding wheel rotation direction:

The two directions of rotation of the grinding wheel,

( a ) indicates that the rotation of the grinding wheel against the cutting edge will cause a small gap in the cutting edge. This phenomenon is particularly prominent for high speed steel.

( b ) indicates that the grinding wheel rotates along the oblique opening, and the small gap described above rarely occurs.

However, when the selected grinding wheel is too hard or the grinding is too smooth, the cutting edge is more likely to have a small gap. We propose that you adjust the direction of rotation of the grinding wheel.

2. Select the appropriate wedge angle (knife angle):

The wedge angle (knife angle) is the main angle affecting the cutting performance of the mechanical blade. The angle of the angle depends mainly on the material to be cut. When you do not specify the requirements, the blade angle of the blade provided by the manufacturer is based on the general 22 ° requirement. Depending on the material being cut, the angle of the knife edge may be as long as 17 ° or as large as 28 °. The angle to be used depends on the actual situation. Here we introduce you to a groping experience: cutting soft materials - Small angle, hard material - large angle.

3. Use a certain pressure of coolant:

When sharpening, the coolant must be used in the sharpening zone, and the blade should be fully cooled during the whole grinding process. Otherwise, the grinding surface will overheat and the cutting edge will lose its cutting ability. Usually , the No. 1 metal emulsion cutting fluid or D15 anti-mold rust-proof emulsion, the coolant should be directly injected into the contact part of the grinding wheel, and the fully pressurized coolant acts not only to cool the working contact point to “take away” the heat generated by the grinding, at the same time It also has a cleaning wheel to prevent the accumulation of dirt.

Directly using water as the coolant is unfavorable for the grinding of the blade. It will cause dirt on the surface of the blade to appear quickly, and the grinding wheel will also become sticky. The coolant prepared by adding certain substances can take away the grinding. Dirt and prevent the grinding wheel from sticking.

4 , master the correct sharpening method:

For the user, the sharpening edge is only a beveled portion, and some users are for some purpose. In order to make the cutting front (large plane) of the knife have a concave shape, it is not preferable to grind the front by itself. We believe that to grind a knife, we must pay attention to three steps to achieve the goal, these three steps are: rough grinding, fine grinding and finishing protection.

( 1 ) rough grinding

The purpose of the rough grinding is to remove the defects of the cutting edge and form a preliminary shape of the cutting edge angle, so that a relatively large feed amount can be used. The temperature at the point of contact between the blade and the grinding wheel can still be tolerated by quietly reaching 200 °C . Remember: Do not give the ground surface a pale yellow or even blue-blue spots. The occurrence of discoloration spots indicates that the temperature has exceeded 200 °C , and subsequent grinding can remove these discoloration spots, but the defects on the blade still exist, which affects the performance of the blade.

( 2 ) fine grinding

Fine grinding is the main step of the whole sharpening. Uniform micro-feeding and sufficient cooling are two key points worth noting. When the ground surface is silver-gray and there is a tiny burr in the blade back direction, fine grinding is even fine. ended.

( 3 ) Photo-curing

Photo-finishing refers to the fact that the grinding wheel or the tool holder can travel several times without the feed amount, so as to improve the straightness of the cutting edge and the self-measurement of the sharpening surface. Generally , the blade of 1 meter length passes through 7 ~ 8 trips can achieve this goal. For longer blades, it may take more than 20 strokes to meet the requirements.

Remarks: This article is produced by Wenzhou Tianming Printing Machinery Co., Ltd., the first-line engineer of the grinding knife machinery. According to the production practice and the manufacturing experience of the factory ( more than 20 years), it is compiled and compiled. It is only for peer learning and user reference. Welcome letter advice ( 619881609 @ qq.com ).

Attachment 1 , Reference: Tianming Grinding Machine Technical Support Center    Http://

Attachment 2 , cited website: China Grinding Machine Network    Http://

Attachment 3 , English information: China grinding machine supplier    Http://

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