CNC precision machining work accuracy inspection experience sharing

CNC precision machining work accuracy inspection experience sharing

In the CNC precision machining industry, the precision (accuracy) of CNC precision machining centers will directly affect the quality and output of products, so for the CNC precision machining industry The work accuracy inspection of CNC precision machining center is the top priority of the company. I would like to share with you some experience on the work accuracy inspection of machining center.

(1) Positioning of the test piece

The test piece should be located in the middle of the X stroke, and should be at the appropriate position along the Y and Z axes for the positioning of the test piece and fixture and the length of the tool. placed at the location. CNC machining in Dongguan greatly reduces the number of tooling, and parts with complex shapes do not require complex tooling. If you want to change the shape and size of the part, you only need to modify the part processing program, which is suitable for new product development and modification. CNC machining CNC machining refers to the machining performed with CNC machining tools. CNC index-controlled machine tools are programmed and controlled by CNC machining language, usually G code. The CNC machining G code language tells the CNC machine tool which Cartesian position coordinates the machining tool adopts, and controls the feed rate and spindle speed of the tool, as well as functions such as tool changer and coolant. When there are special requirements for the positioning position of the test piece, it should be stipulated in the agreement between the manufacturer and the user.

(2) Fixing of the test piece

The test piece should be fixed in a special fixture It is easy to install on the top to achieve the maximum stability of the tool and fixture (explanation: stable and stable; no change). The mounting surface of the fixture and the test piece should be straight.

The parallelism between the mounting surface of the specimen and the clamping surface of the fixture should be checked. A suitable clamping method should be used to allow the tool to penetrate and machine the full length of the center hole. It is recommended to use a countersunk screw to fix the specimen to avoid interference between the tool and the screw, and other equivalent methods can also be used. The overall height of the test piece depends on the fixing method chosen.

(3) The material, tool and cutting parameters of the test piece

The material, cutting tool and cutting parameters of the test piece are selected according to the agreement between the manufacturer and the user, and should be recorded Next, the recommended cutting parameters are as follows:

1. Cutting speed: about 50m/min for cast iron; about 300m/min for aluminum (Al) parts.

2. Feed Quantity: about (0.05~0.10) mm/tooth. CNC machine tool processing is the abbreviation of digital control machine tool. It is an automatic machine tool equipped with a program control system, which can make the machine tool move and process parts according to the programmed program. It integrates the latest technologies such as machinery, automation, computer, measurement, and microelectronics. The basic components include processing program carrier, numerical control device, servo drive device, machine tool main body and other auxiliary devices.

3. Cutting depth: The radial cutting depth of all milling operations should be 0.2 mm. The maximum size is reduced and the hole diameter is increased. When it is used for inspection and acceptance inspection, it is recommended to select the final contour processing specimen size consistent with that specified in this standard, so as to faithfully reflect the cutting accuracy (precision) of the machine tool. The test piece can be used repeatedly in the cutting test, and its specification should be kept within ±10% of the characteristic size given in this standard. When the specimen is reused, a thin cut shall be made to clean all surfaces before a new finish test is performed.

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