CNC Machining: As a CNC Machining Technician, How to Process High-Precision CNC Machining Parts?

How CNC machining technicians use precision surface grinders correctly and CNC machining precautions can be divided into the following categories:

1. What safety factors need to be paid attention to before using a precision surface grinder?

Before using the grinder, first check the circuit of the machine, whether the switch button is running normally, whether the center of the grinder shaft is concentric, and whether there are collision marks on the center shaft of the grinder, which cause the deviation of the shaft center distance.

2. How to check whether the balance of the shaft center is normal and whether the accuracy is up to standard?

Before testing, we must first prepare testing tools for calibration. Generally, precision CNC machining parts factories use calibration accuracy between 0.001 and 0.005. The calibration brand currently used by our company is mainly Japan's Mitutoyo, because Mitutoyo's measuring instruments are relatively It is said that the error is small, and the CNC machined parts made are more secure.

3. How to use the precision calibration table to detect the center distance error of the grinder?

Take out the precision calibration watch first. When using the calibration watch here, be careful not to collide the watch head. That place is very easy to break. After all, the pointer rotates. On the table, slightly adjust the direction of the meter head, and gently press the position of the axis of the grinder to start the detection.

4. How to correctly use the precision calibration table to detect whether the axis is concentric? How to operate it?

When our precision watch head touches the grinder shaft, the watch hand will start to rotate slightly at this time, don't be afraid, this is a normal operation phenomenon, for example, when the pointer rotates to one of the values ​​(80), do not touch the watch head at this time. Touch it, after the needle value is adjusted, how to detect it? At this time, we can use the transmission that comes with the grinder, turn on the switch button, and adjust the speed to the lowest level. At this time, we pay attention to the movement of the pointer in the school watch. 80), it means that the axis is in good condition. If it is found that the needle points to swing left and right at this time, it means that the axis has suffered a serious collision or there is a problem with the machine, and it is necessary to contact the professional and technical personnel of the grinding machine for overhaul.

5. After checking the basic operation of the grinding machine, how to start using the grinding machine and select the grinding wheel?

After the normal inspection of the grinding machine axis is completed, it can be used at this time. How to use it? First of all, we correctly select the type of grinding wheel required for precision CNC machining parts according to the parts we want to process. The general labels of the grinding wheels are: 46K, 60K, 80K, 100K, 120K, 180K, 220K, 320K, 500K, etc. How many labels are used? The grinding wheel should be selected according to the position of the CNC machining parts.

6. How to choose CNC grinding wheel correctly?

First of all, when we precision CNC machining parts, the general precision CNC machining parts factory is all processed according to the drawing. The general materials are divided into many categories. Here are just a few types. 2083, 1.2344, 1.2510, DF2, SKD61, S136, etc. Generally, before CNC machining, all the material dimensions are reserved and left for the grinding machine to grind in place. For example: For example, the drawing requires a height of 30mm, a width of 50mm, and a length of 100mm, then the general The size of the fine material or milling machine processing allowance: height 30.5, width 50.5, length 100.5, at this time we need our grinder to operate in place, generally the first choice for roughing grinding wheel is 46K, which is the standard specification for roughing commonly used in processing, why choose 46K grinding wheel Woolen cloth? Speaking of which, we can find several types of grinding wheels for comparison. Among the several grinding wheels, the 46K grinding wheel has the roughest and less dense sand grains, so when we precision CNC machining parts, we must use the roughest grinding wheel to grind it off. excess amount.

7. When the reserved material is processed according to the drawing, how much of the allowance should be left for roughing and finishing?

Here we must first understand what materials are processed in the drawings, such as soft materials and hard materials. Soft materials are generally used in fixtures that do not require hardness, such as s45, s50, P20, NAK80, 718 and other soft materials The hardness is about 20-40 degrees, and it is used for molds that do not require hardness. This material is generally easy to process, and it is not too hot when grinding. It is not suitable for deformation, and it is easy to control the size. In place, and the other hard material should be paid attention to. When opening thick, be sure to control the hotness. If the hotness is not well controlled, after cooling, the size will be directly reduced, and it will no longer be possible to correct it. Material models DH31, 2083, 1.2344, 1.2510, DF2, SKD61, S136, etc. are all materials that need to be hardened, and the hardness is required to be between 52-54 degrees. It is used for the kind of molds with high requirements and high temperature collision resistance. The life of CNC machined parts should be longer, and of course the price is much higher. Please remember that when processing such materials, the allowance should be gradually cooled and processed. If it is hot, please use alcohol or heat transfer between the workpiece and the workpiece for CNC machining. The cooling of the parts achieves the most perfect effect. After the roughing is completed, the allowance is reserved and then finished to the size required by the drawing to ensure foolproof.