Tag Archive Decomposition of CNC machining process

Decomposition of CNC machining process

CNC machining center is an efficient automatic machine tool suitable for machining complex parts by mechanical equipment and CNC system. Its comprehensive processing capacity is stronger, and it can finish the processing after clamping the workpiece. The efficiency of the batch workpiece with high processing accuracy and medium difficulty is 5 ~ 10 times higher than that of the ordinary equipment. In particular, it can complete the processing that many ordinary equipment can not complete, and the complex shape, high-precision single processing or small batch and multi variety production are more suitable.

Here are some tips to teach you how to operate the CNC machining center easily

1。 In order to simplify the positioning and installation, the machining center of each fixture positioning surface should have accurate coordinate size.

2。 In order to ensure the part installation position and programming direction consistency of workpiece coordinate and machine coordinate system, and installation direction.

3。 Can be deleted after a short period of time to adapt to the new workpiece fixture. Because the auxiliary time of CNC machining center is compressed very short, it can not take too much time to support fixed loading and unloading.

4。 Fixtures should have as few elements and high stiffness as possible.

5。 Try to open the fixture. The space position of clamping elements can be very low, and the installation fixture and tools can not interfere in one step.

6。 Ensure that the parts within the range of spindle travel are processed.

7。 Due to the movement of worktable and rotation movement, fixture design must prevent the space interference of fixture and machine tool.

8。 Try to finish everything in the clamping process. When replacing the clamping point, pay special attention not to damage the positioning accuracy of the replacement clamping point, if necessary, during this process.

9。 The flatness of fixture base, worktable and fixture bottom must be within 0.01-0.02 mm, and the surface roughness should not be greater than ra3.2. CNC CNC lathe is a kind of high-precision and high-efficiency automatic machine tool. The use of CNC lathe can improve the processing efficiency, To create more value, the appearance enterprises of CNC lathe get rid of backward processing technology. The processing process of CNC lathe is similar to that of ordinary lathe. However, due to the clamping and automatic processing of CNC lathe, the following aspects should be paid attention to.

Reasonable selection of cutting parameters

For effective metal cutting, machining materials, cutting tools and cutting conditions are the three main factors. These determine the processing time, tool life and machining quality. Cutting conditions must be selected reasonably for economical and efficient processing methods.

The three elements of cutting conditions: cutting speed, feed and cutting depth directly cause damage. With the increase of cutting speed, the point temperature will rise, resulting in mechanical, chemical and thermal wear. If the cutting speed is increased by 20%, the tool life will be reduced by 1 / 2.

Back feed conditions and tool wear are kept to a minimum. But feeding behind, cutting temperature rise, wear. It is less than the effect of cutting speed. Cutting depth has no effect on cutting speed and feed, small cutting depth, but cutting material in hardened layer will also affect tool life.

According to the user’s processing material, hardness, cutting conditions, material selection, feed and cutting depth, the cutting speed is used.

Based on the selection of the most suitable process conditions, these factors are selected. Regular life and stable wear are the most ideal conditions.

However, in practice, the selection of tool life and tool wear, through machining size, surface quality, noise reduction, heat and so on. Under certain treatment conditions, it is necessary to study according to the actual situation. Difficult to machine materials such as stainless steel, heat-resistant alloy, can use coolant or choose a good rigid blade.

Reasonable selection of cutting tools

1。 Rough rotation, should choose high strength, good durability knife, in order to meet the large car turning, feedback.

2。 The essence of automobile is to select high precision, durable and good cutting tools to ensure the machining accuracy.

3。 Reduce the conversion time and knife convenience, should try to use machine knife and machine clip blade.

Select fixture

4。 General fixture should be selected to clamp workpiece as much as possible, and special fixture should be avoided;

5。 The coincidence of parts positioning datum reduces the positioning error.

Determine the processing route

Machining path is the part of tool path and direction relative to each other in the process of exponential control.

1。 It should be able to meet the requirements of machining accuracy and surface roughness;

2。 Shorten the processing route as far as possible and reduce the idle travel time of the tool.