1, turning and milling machine tool reasonable selection of cutting dosage

For efficient metal cutting processing, the material being machined, cutting tools, cutting conditions are the three main elements. These determine the processing time, tool life and processing quality. Cost-effective processing is necessarily a reasonable choice of cutting conditions.

The three elements of cutting conditions: cutting speed, feed and depth of cut directly cause damage to the tool. With an increase in cutting speed, the tool tip temperature rises and mechanical, chemical and thermal wear occurs. A 20% increase in cutting speed reduces tool life by 1/2. The relationship between feed conditions and wear behind the tool arises in a very small range. However, with high feeds, cutting temperature rises and back wear is high. It has a smaller effect on the tool than cutting speed. The effect of depth of cut on the tool is not as great as the cutting speed and feed, but in the tiny depth of cut cutting, the material being cut produces a hardened layer, which also affects the life of the tool. However, in actual operation, the selection of tool life is related to tool wear, dimensional changes of the machined material, surface quality, cutting noise, machining heat, etc. When determining the machining conditions, studies need to be conducted based on actual conditions. For difficult-to-machine materials such as stainless steel and heat-resistant alloys, coolant can be used or choose a good rigidity of the cutting edge.

2, the amount of tool feed (walking tool amount)

Mainly depends on the workpiece processing surface roughness requirements. When finishing, the surface requirements are high, the amount of tool travel is small: 0.06~0.12mm/spindle per revolution. When rough machining, it can be larger. Mainly determined by the tool strength, generally desirable 0.3 or more, tool strength is poor when the main back angle of the tool is large, the amount of feed can not be too large. In addition should also consider the power of the machine tool, the workpiece and tool rigidity. CNC program uses two units of tool feed: mm / min, mm / spindle per revolution, the units used above are mm / spindle per revolution, such as the use of mm / min, the available formula for conversion: the amount of tool feed per minute = the amount of tool feed per revolution * spindle revolutions per minute.

3、Depth of tool eating (depth of cut)

When finishing, generally take 0.5 (radius value) or less. When rough machining, it is decided according to workpiece, tool and machine tool, generally small lathe (larger processing diameter is below 400mm) turning No.45 steel in normalized condition, the depth of cutter in radius direction is generally not more than 5mm. The output power will be significantly reduced, and the tool eating depth and tool feed can only be small at this time.

4. Fixture installation points

At present, the hydraulic chuck and hydraulic clamping cylinder connection is achieved by the tie rod, hydraulic chuck clamping points are as follows: first of all, remove the nut on the hydraulic cylinder with a hand, remove the pull tube, and pull out from the back end of the spindle, and then remove the chuck set screw with a hand, you can remove the chuck.

Turning and milling machine tool equipment users to be processed according to the material, hardness, cutting state, material type, feed, depth of cut, etc. to choose the cutting speed used. The selection of more suitable processing conditions is selected on the basis of these factors. A regular and stable wear to reach the life is the ideal condition.