2020 – Page 93 – CNC Machining & Turning, Milling, Metal parts

Double head reticulated aluminum column

Double head reticulated aluminum column,Model airplane accessories

Metal screw lock adjuster

Customized remote control model airplane accessories, metal screw lock adjuster, model airplane, quick pull rod adjuster

Four axis multi rotor aerial photography UAV

Carbon fiber spiral, positive and negative rotor balancer (maglev type), four axis multi rotor aerial photography UAV

Aluminum alloy motor base

Aluminum alloy motor base, motor mounting pipe clamp, multi axis navigation model accessories

Aircraft model motor shell

Aircraft model parts processing, toy parts gear machining, aircraft model hardware parts, aircraft model motor shell2

Aircraft model parts processing

Aircraft model parts processing, toy parts gear machining, aircraft model hardware parts, aircraft model motor shell

What is the quality of the automated part processing machine?

The quality of the machine depends on the machining quality of the parts and the assembly quality of the machine. The machining quality of the parts includes the machining accuracy and the surface quality of the parts. The machining accuracy of the parts refers to the degree that the actual geometric parameters (size, shape and position) after machining are consistent with the ideal geometric parameters. The difference between them is called machining error. The machining error reflects the machining accuracy. The larger the error is, the lower the machining accuracy is, the smaller the error is, the higher the machining accuracy is; the main aspects affecting the machining accuracy are: dimensional accuracy, the degree of conformity between the actual dimension of the machined part and the tolerance zone center of the part dimension. Compared with the method of producing parts by die-casting die, it avoids the uneconomical of opening die when manufacturing small batch parts and greatly shortens the production cycle. At the same time, the correct clamping positioning and reasonable processing technology make the machined parts have high precision and surface finish, which is not achieved by the die casting technology. Moreover, the density of extruded aluminum profile is relatively high, and the strength of processed parts is higher than that of die casting. In addition, this method is different from the general single part machining production, it can produce a bed of parts in batch. If the worktable of the machine tool is large enough, the base plate can be larger, and several aluminum materials can be arranged at a time, the processing efficiency can be further improved, and the number of tool changes can be relatively reduced. If there are features on the side of the part to be machined, for example, if there are round holes to be drilled, then after the part is cut on the B side, the fixture shall be manufactured, and the part shall be installed before machining.

What is the effect of CNC rough machining on parts?

With the continuous development of the processing industry, what we use can only be completed after processing, and the processing must use machines to reduce product defects. Dongguan CNC parts processing is one of them, so what kind of consequences will be caused by rough CNC processing on parts?

1. Impact on wear resistance: the rougher the surface of CNC machining, the smaller the effective contact area between mating surfaces, the greater the pressure, the greater the friction resistance and the faster the wear.

2. Affect the stability of fit: for gap fit, the rougher the surface is, the easier it is to wear, so that the middle gap in the working process gradually increases; for interference fit, because the micro convex peak is squeezed flat during assembly, the practical effective interference is reduced, and the joint strength is reduced.

3. Influence on fatigue strength: there are large grooves on the surface of rough parts. Like sharp corner notches and cracks, they are sensitive to stress concentration, thus affecting the fatigue strength of parts.

4. Impact on corrosion resistance: the rough surface of parts is easy to make corrosive gas or liquid penetrate into the inner metal layer through the micro concave Valley on the surface, forming external corrosion.

5. Influence on sealing: rough surfaces cannot fit tightly, and gas or liquid leaks through the gap between contact surfaces.

6. Influence on contact stiffness: contact stiffness is the ability to resist contact deformation of the separation surface of the part under the action of external force. The stiffness of the machine depends on the contact stiffness between the parts to a great extent.

7. Affect the measurement accuracy: the surface roughness of the measured surface of the part and the measuring surface of the measuring tool will directly affect the measurement accuracy, which is in the fine measurement.

Which parts are suitable for precision machining?

We know that precision machining requires high precision. Precision machining has good rigidity, high manufacturing precision and accurate tool setting, so it can process parts with high precision. Which parts are suitable for precision machining? Here’s the introduction:

First of all, compared with the general lathe, CNC lathe has the function of constant linear speed cutting. No matter for the end face or the outer circle with different diameters, it can be processed with the same linear speed, which guarantees the surface roughness value and is relatively small. The general lathe is a constant speed, different diameter cutting speed is different. In the case of workpiece and tool material, finishing allowance and tool angle, surface roughness depends on cutting speed and feed speed.

When machining surfaces with different surface roughness, small feed speed is selected for surfaces with small roughness, and larger feed speed is selected for surfaces with large roughness, which has good variability, which is difficult to achieve in general lathe. Parts with complex contour. Any plane curve can be approximated by a straight line or an arc. CNC precision machining has the function of arc interpolation, which can process various parts with complex contour. The use of CNC precision machining needs the careful use of the operator.

CNC precision machining mainly includes finishing turning, boring, milling, grinding and other processes:

(1) Fine turning and fine boring: most of the precision light alloy (aluminum or magnesium alloy, etc.) parts of the aircraft are processed in this way. Generally, natural single crystal diamond cutting tools are used, and the arc radius of the cutting edge is less than 0.1 μ M. The surface roughness of 1 μ m and average height difference less than 0.2 μ M can be obtained by machining on high-precision lathe, and the coordinate accuracy can reach ± 2 μ M.

(2) Finish milling: used for machining aluminum or beryllium alloy structural parts with complex shape. Depending on the precision of machine tool’s guide rail and spindle, we can get high precision of mutual position. The precise mirror surface can be obtained by high-speed milling with a carefully ground diamond cutter head.

(3) Fine grinding: used for machining shaft or hole parts. Most of these parts are made of hardened steel with high hardness. Most high-precision grinding machine spindles adopt hydrostatic or hydrodynamic liquid bearings to ensure high stability. The grinding accuracy is not only affected by the rigidity of machine tool spindle and bed, but also related to the selection and balance of grinding wheel, the machining accuracy of workpiece center hole and other factors. The size accuracy of 1 μ m and the out of roundness of 0.5 μ M can be obtained by fine grinding.

(4) Grinding: select and process the irregular convex parts on the surface to be processed by the principle of mutual grinding of mating parts. Abrasive diameter, cutting force and cutting heat can be precisely controlled, so it is a high-precision machining method in precision machining technology. The hydraulic or pneumatic mating parts of the precise servo components of the aircraft and the bearing parts of the dynamic pressure gyro motor are processed by this method to achieve the accuracy of 0.1 or even 0.01 μ m and the micro unevenness of 0.005 μ M.

What should we pay attention to when processing precision hardware parts?

We have introduced the process flow of precision hardware parts to you before, so today’s chief engineer of hardware will share the following precautions for precision hardware parts processing:

1. Check whether the moving part is filled with lubricating oil before the operation of precision hardware parts processing machinery, then start and check whether the clutch and brake are normal, and run the machine tool for 1-3 minutes by air. It is forbidden to operate when the precision hardware parts processing machinery is in fault.

2. Keep correct posture at work, and have enough spirit to deal with the work. If you find physical discomfort, you should leave the post immediately and report to the leader. During the operation, the operator shall be concentrated, no chatting and cooperating with each other. The operator shall not operate in the state of fidgety and tired to avoid

In case of accident, ensure operation safety. Before entering the work position, all employees shall check whether their clothes meet the work requirements. It is not allowed to wear slippers, high-heeled shoes and clothes that affect safety. Those with long hair shall wear safety helmet.

3、 When the die is replaced, the power supply shall be turned off first, and the die can be installed and debugged only after the movement Department of the press stops running. After installation and adjustment, move the flywheel by hand twice for trial punching, and check whether the upper and lower dies are symmetrical and reasonable, whether the screws are firm, and whether the blank holder is in a reasonable position.

4. After other personnel leave the mechanical working area and take away the sundries on the workbench, the power supply can be started to start the machine.

5. When the precision hardware parts processing machinery works, it is forbidden to extend your hand into the sliding block working area, and it is forbidden to take and place the workpiece by hand. Use standard tools when taking and placing workpieces in the die. In case of abnormal sound or failure of the machine, turn off the power switch immediately for inspection.

After the machine is started, one person shall transport materials and operate the machine. Other people shall not press the electric building or step on the foot switch board, nor put the hand into the mechanical working area or touch the moving part of the machine by hand.

6. When leaving work, turn off the power supply and tidy up the finished products, leftovers and sundries on the post to ensure the working environment is clean and safe.