What are the precautions for grinding tools on ordinary lathes?

Pay attention to the problem of incorrect diameter in ordinary lathes:

Measure the mid-diameter size frequently.

Use the dial correctly.

Sharpen and measure the turning tool angle correctly.

When cutting with high-speed steel turning tools, the cutting speed should be reduced and cutting fluid should be added.

Increase the cross-sectional area of the tool holder, and reduce the extension length (because the tool holder is not rigid enough, it is easy to produce vibration during cutting).

Reduce the longitudinal rake angle of the turning tool, and adjust the gap between the sliding plate screw nuts (the longitudinal rake angle of the turning tool is too large, and the sliding plate screw nut gap is too large, which is easy to produce piercing).

The basic content of the fitter's work is:

Hand tools are used to perform various machining of workpieces on vices and platforms, and sometimes to repair equipment. The basic operations include marking, filing, sawing, chiseling, drilling, countersinking, reaming, reaming, tapping, threading, riveting, straightening, bending, grinding, measuring, assembling and commissioning, simple heat treatment, oil painting, etc.

The main task. It is mainly divided into the following processing parts, equipment maintenance, manufacturing and maintenance.

1. Processed parts.

Some machining that is not suitable or can not be solved by mechanical methods can be completed by fitters. Such as: marking in the process of parts processing, precision machining (such as scraping, frustration and making molds, etc.), inspection and repair, etc.

Assembly: The parts are assembled according to the technical requirements of the assembly of mechanical equipment, the components are assembled and matched, excavated and adjusted, inspected and tested, etc., so as to make them qualified mechanical equipment.

2. Equipment maintenance.

When the machinery fails during use, is damaged or the accuracy is reduced after long-term use, which affects the use, it should also be maintained and repaired by fitters.

3. Manufacture and repair of stools.

Manufacture and repair of all kinds of tools, fixtures, gauges, molds and all kinds of professional equipment.

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Precautions when sharpening:

1. The type of grinding wheel must be determined according to the tool material. Generally, when sharpening the cutting tool body and high-speed steel turning tool, use a white alumina grinding wheel; When sharpening carbide turning tools, use green silicon carbide grinding wheels. If conditions permit, diamond grinding wheels can be used when grinding carbide turning tools.

2. When sharpening the carbide carbide, do not put the cutter head part into the water to cool down to prevent the blade from suddenly cooling and breaking. When sharpening high-speed steel turning tools, they should be cooled with water at any time to prevent overheating and annealing of turning tools and reducing hardness.

3. When grinding, the height of the turning tool must be controlled in the horizontal center of the grinding wheel, and the cutting head is slightly upturned, otherwise defects such as excessive rear angle or negative rear angle will occur.

4. Cemented carbide tools should be sharpened on green silicon carbide grinding wheels, and high-speed steel tools should be sharpened on white alumina grinding wheels. It should be sharpened on the grinding wheel with a grit size of 46-60 during rough grinding, and sharpened on the grinding wheel with a grit size of 60-80 during fine grinding. Green silicon carbide stone should be used for grinding cemented carbide tools, and white alumina stone should be used for high-speed steel tools.

5. Tungsten titanium cobalt cemented carbide turning tools, due to their strong sensitivity to cold and heat and impact, when the ambient temperature changes greatly, cracks will also occur, such as in the winter in northern China, if the grinding tool is placed in cold air, cracks will often occur, and it is best to keep warm and cool slowly.

6. When sharpening the chip breaker, it is easy to slip when the turning tool and the grinding wheel are in contact, so it is necessary to pay attention to safety.

The posture and method of sharpening the turning tool are: (1) The person stands on the side of the grinder to prevent the fragments from flying out and injuring people when the grinding wheel is broken; (2) The distance between the two hands of the knife is released, and the two elbows are clamped around the waist to reduce the shaking when sharpening the knife; (3) When sharpening the tool, the turning tool should be placed in the horizontal center of the grinding wheel, the tip of the knife should be slightly upturned about 3 ° 8 °, and the turning tool should be left and right after touching the grinding wheel.

Pay attention to slotting and grind with heart.

What kind of knife do you have to sharpen.