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What are the cutting tool grinding skills?

  • Author:Nayuy
  • Source:Boreway
  • Release on:2019-01-19

1. Selection of grinding wheel:

(1) alumina grinding wheel: it is white with good toughness and sharpness, but slightly lower hardness. It is suitable for grinding high-speed steel and hard alloy parts.Alumina grinding wheel is also called corundum.

(2) silicon carbide grinding wheel: green, its sand hardness, cutting performance is good, but more brittle, suitable for cutting hard alloy turning tool.

The size of grinding wheel is expressed as particle size, which is used for coarse grinding and fine grinding.

2. Methods and steps for sharpening turning tool:

(1) first, grind the welding slag on the front and back, and then grind the bottom surface of the turning tool flat. Alumina grinding wheel with particle size no. 24-36 can be used.

(2) rough grinding of the tool shank at the back of the main blade and the back of the auxiliary blade: when grinding, tilt the turning tool at the horizontal position of the external cylinder of the grinding wheel slightly higher than the center of the grinding wheel by an Angle 20-30 degrees larger than the rear Angle on the cutter body, and move slowly left and right to facilitate the grinding of the main rear Angle and the rear Angle of the auxiliary blade on the blade body.
Alumina grinding wheel with particle size of 24-36 and medium soft hardness is available.

(3) the main back of the rough grinding tool body: when the grinding tool surface is finished, the tool handle should be parallel to the axis of the grinding wheel, and the bottom plane of the tool body should be inclined to the direction of the grinding wheel by an Angle 20 times larger than the main rear Angle.When grinding, the back clearance surface of the turning tool is first placed on the outer circle of the grinding wheel, and the starting position of grinding is close to the center of the grinding wheel, and then the grinding continues to approach the grinding wheel, and moves slowly left and right.When the grinding wheel grinds to the edge of the knife, it is finished.In this way, the main deflection Angle and the main rear Angle can be grinded out simultaneously.Available 36-60 silicon carbide grinding wheel.

(4), coarse grinding Angle after vice: behind the mill vice, handle the tail should be turned to the right a pair of Angle Angle, tilt wheel direction turning tool at the same time the bottom flat face a bigger than vice Angle after 20's perspective, the concrete method and the coarse grinding of the knife body is approximately the same god behind, behind different is coarse grinding wheel should be grinding to the point.Also can grind at the same time sub - declination Angle and sub - after Angle.

(5) rough grinding front: rough out the front of the turning tool with the end face of the grinding wheel, and grind out the front Angle while grinding the front.

(6) grinding chip breaker: chip breaker has two kinds, one is linear, suitable for cutting harder materials;One is an arc shape, suitable for softer materials.

Generally speaking, the chip breaker groove of manual grinding is of arc shape. The outer circle of the grinding wheel and the corner of the end face shall be polished into corresponding arc with the diamond pen of grinding wheel.If the cutting edge grinds out the linear chip breaker, the grinding wheel intersection Angle must be trimmed and grinded very sharp.Edge grinding can be down or up grinding, but the cutting edge grinding chip groove parts, should consider the width of the chamfered edge set apart.

Matters needing attention in chip grinding and chip breaking groove:

The corner of the grinding wheel should always be sharp or have a circular arc of a certain shape. When the edge of the grinding wheel has a large corner, it should be trimmed in time.

The starting point of the grinding should be a certain distance from the cutting edge and the main cutting edge. The distance from the main cutting edge should be half of the width of the chip breaker and the width of the chamfering edge.

When grinding, do not use too much force. The turning tool moves slowly in the direction of the handle.Small size of a forming, large size can be divided into rough grinding and fine grinding process grinding forming.

(7) master back and vice back of fine grinding: it is better to trim the grinding wheel before fine grinding, keep the grinding wheel rotating smoothly, the bottom plane of the turning tool is against the adjusted bracket, and make the cutting edge gently against the end face of the grinding wheel, moving slowly left and right along the end face of the grinding wheel.Optional grinding wheel size 180-200.

(8) grinding negative chamfering: the inclination Angle of negative chamfering is -50--100, and the width b= (0.5-0.8) f.Negative chamfering is not suitable for carbides with lower front Angle and materials with lower strength and hardness.

When grinding negative chamfering, the force is slight, and the back end of the main cutting edge should swing towards the tool tip.The straight grinding method and the horizontal grinding method can be adopted in knife grinding, and the straight grinding method is preferred.

(9). Grinding the transition edge: the method of grinding the transition edge is the same as that of the surface after grinding. When grinding the turning tool with hard materials, negative chamfering can also be made on the transition edge.

(10) manual grinding of turning tool: grinding with whetstone requires smooth action and even force.

Note: grinding should be done on the side of the grinding wheel.

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