The processing technology of CNC lathe is similar to that of ordinary lathe. However, since CNC lathe is one-time clamping and can complete all turning processes continuously and automatically, attention should be paid to the following aspects.
1. Reasonable tool selection:
(1) In rough turning, the tool with high strength and good durability should be selected to meet the requirements of large back cutting and large feed rate.
(2) When finishing turning, the tool with high precision and good durability should be selected to ensure the machining accuracy.
(3) In order to reduce the tool change time and facilitate tool setting, the machine clamping tool and machine clamping blade should be used as far as possible.
2. Reasonable selection of fixture:
(1) The general fixture should be selected as far as possible to clamp the workpiece, and the special fixture should be avoided;
(2) Positioning error is reduced by means of locating datum.
3. Determine the processing route: machining route refers to the movement path and direction of the cutter relative to the parts in the process of NC machine tool processing.
(1) The machining accuracy and surface roughness requirements shall be guaranteed;
(2) The processing route should be shortened as far as possible to reduce the tool idle travel time.
4. The relationship between machining route and machining allowance: under the condition that the CNC lathe has not reached the universal use, the excessive allowance on the blank, especially the allowance containing forging and casting hard layer, should be arranged for processing on the common lathe. If must use the numerical control lathe processing, must pay attention to the program's flexible arrangement.
5. Key points of fixture installation: the connection between the hydraulic chuck and the hydraulic clamping oil cylinder is realized by the * pull rod. The clamping points of the hydraulic chuck are as follows: firstly, remove the nut on the hydraulic cylinder with a handler, remove the pull pipe, and pull it out from the rear end of the main shaft, and then remove the chuck fixing screw with the handler to remove the chuck.
6. Reasonable selection of cutting parameters: for efficient metal cutting, the material to be processed, cutting tools and cutting conditions are the three major elements. These determine the processing time, tool life and machining quality. The economical and effective machining method must be the reasonable choice of cutting conditions. The three factors of cutting conditions: cutting speed, feed rate and cutting depth directly cause tool damage. With the increase of cutting speed, the tool tip temperature will rise, which will produce mechanical, chemical and thermal wear. If the cutting speed is increased by 20%, the tool life will be reduced by 1 / 2.
The relationship between feed condition and tool back wear occurs in a very small range. But the feed rate is large, the cutting temperature rises, and the back wear is large. It has less effect on the tool than the cutting speed. Although the influence of cutting depth on the tool is not as great as the cutting speed and feed rate, but when the cutting depth is small, the hardened layer of the material to be cut will also affect the tool life.
The user should select the cutting speed according to the material to be processed, hardness, cutting state, material type, feed rate, cutting depth, etc. The most suitable processing conditions are selected on the basis of these factors. Choose CNC lathe processing plant to recognize titanium Hao, regular, stable wear to achieve life is the ideal condition. However, in practice, the choice of tool life is related to tool wear, size change, surface quality, cutting noise and processing heat. When determining the processing conditions, it is necessary to study according to the actual situation. For stainless steel and heat-resistant alloy and other difficult to machine materials, you can use coolant or choose a good rigid blade.
Turning is a method of cutting workpiece on a lathe by rotating the workpiece relative to the cutter. The cutting energy of turning is mainly provided by workpiece rather than tool. Turning is the most basic and common cutting method, which plays an important role in production. Turning is suitable for machining rotary surface. Most of the workpieces with rotary surface can be machined by turning method, such as inner and outer cylindrical surface, inner and outer cone surface, end face, groove, thread and rotary forming surface, etc. the tool used is mainly turning tool.
On 2018-08-08 11:45:46
