Grinding Method of Turning Tools

2019-08-10 Yixin Precision Metal and Plastic Ltd

It is necessary to sharpen turning tools after blunting. How to use new technology to finish the grinding process of turning edges with high precision and efficiency is the main task of the grinding process.  The following is a brief introduction to the selection method of lower grinding tools by:  

I. Selection of Abrasive Tools

The characteristics of abrasive tools are determined by abrasive materials, particle size, hardness, binder and combination factors.

Abrasives: The commonly used abrasives are oxide, carbide and high-hardness abrasives.

Grain size: grain size indicates the degree of abrasive grain size.  The number of holes in the length of each inch through which the abrasive particles can pass is taken as the symbol, and the larger the number, the finer the abrasive particles are.

Hardness: The hardness of the grinding tool reflects the difficulty of abrasive particles falling off the surface of the grinding wheel under the action of grinding force.  Hard grinding wheel means that surface abrasive particles are difficult to fall off, while soft grinding wheel means abrasive particles are easy to fall off.

Bonding agents and combinations: ceramic bonding agents and combined abrasive tools are generally selected.

Second, the car blade grinding steps

Grinding the main flank and grinding the main declination angle and the main flank at the same time;

Grinding the back face of the pair, and grinding out the pair deflection angle and the pair back angle at the same time;

Grinding the front and grinding the front corner at the same time;

Grind all knife surfaces and tips.

3. grinding tool posture and method

People stand on the side of the grinding machine to prevent debris flying out and hurting people when the grinding tool is broken.

The distance between the two hands holding the knife is released, and the waist is clamped by two elbows to reduce the shaking during sharpening.

When grinding the main and auxiliary flank surfaces, the turning tool should be placed in the horizontal center of the grinding wheel. After contacting the grinding wheel, the turning tool should move left and right.  When the lathe tool leaves the grinding wheel, the lathe tool should be lifted up to prevent the grinded blade from being bruised by the grinding wheel.

When grinding the tool face, the tail of the tool bar is tilted to the left by a main deflection angle.  When grinding the back face of the pair, the tail of the cutter bar is offset to the right by an angle of a pair deflection angle;

When grinding the tip arc, the left hand usually holds the front end of the turning tool as the fulcrum and the right hand rotates the tail of the turning tool.

4. Selection of Grinding Oil

High-speed grinding oil plays a key role in the process of tool repair and grinding. Good cooling performance and extreme pressure anti-wear performance have made a qualitative leap in the service life of grinding tools and the improvement of tool precision.

(1) extreme pressure performance of grinding oil: special grinding oil contains sulfurized extreme pressure antiwear additive components, which can effectively protect grinding tools and improve process accuracy.

(2) Chemical properties of grinding oil: Compared with rapeseed oil, machine oil and reclaimed oil, special grinding oil has good chemical stability and will not cause harm to equipment, human body and environment.

(3) Other properties of grinding oil: The special grinding oil has passed strict tests in viscosity, flash point, pour point and thermal conductivity to meet various technological requirements.

The above is the selection method of grinding tools for metal grinding process. High-quality raw materials are the premise to obtain good grinding quality. In addition, the grinding process precision is closely related to the surface condition of the workpiece and the heat treatment process.   

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