Introduction to common problems of milling cutter dividing machine

As the manufacturing of electronic products becomes more and more refined, the quality requirements are improved. As the splitting is a destructive process (from the whole panel to the single panel), more and more PCBA manufacturing companies pay attention to how to reduce the stress. At present, the most widely used way in the market is to use the milling cutter dividing machine. How can we better understand the milling cutter dividing machine? At present, the common problems are: 1. Cutting accuracy; 2. Cutting efficiency; 3. Service life of milling cutter; 4. Dust management.

The cutting accuracy is affected by three points:

1) The repetition accuracy of the equipment itself can determine most of the cutting accuracy problems. The common two position plate splitting machine in the existing market: structure x, y, Z combination plus double linear motor feeding and discharging, which has high cutting efficiency and high accuracy.

2) Milling cutter is also the key factor of cutting. There are milling cutters produced at one time and milling cutters spliced in the market. The coaxiality of milling cutters produced at one time is higher than that of splicing.

3) The accuracy of fixtures and PCBA products, and the accuracy of PCB boards should be ensured at the same time. In order to ensure the accuracy of fixtures, we generally require customers to provide whole DXF file panels and single products.

Three factors affecting efficiency:

1. It still has something to do with the equipment structure. Under the same conditions, the cutting efficiency of linear motor is higher than that of traditional screw.

2. The torque and speed of the main shaft reach an optimal balance point to optimize the efficiency of the main shaft.

3. The design of the circuit board is related to the milling cutter. For example, if the 1.6mm circuit board selects the milling cutter with diameter of 1.0 and 1.5, the milling cutter with large diameter will have faster cutting speed. If the same 1.5 milling cutter is used to cut PCB boards with thickness of 1.2mm and 1.6mm, the cutting resistance of the milling cutter is different, and the cutting speed of thin boards will be faster.

Based on the above conclusions, it is very important to select the appropriate milling cutter for PCB. If the speed is too fast, the milling cutter will break or deform, resulting in uncontrollable arc cutting.

The life of milling cutter is closely related to the requirements of cutting speed, milling cutter diameter and cutting precision.

1) The faster the cutting speed, the faster the wear of the milling cutter.

2) The diameter of the milling cutter determines the length of the effective cutting edge. The larger the diameter, the relative use.

3) The requirement of cutting accuracy is also a factor affecting the service life of the milling cutter. For example, if the cutting accuracy is required to be ± 0.07mm and ± 0.1mm, the ± 0.1mm cutting can allow the wear of the milling cutter to be larger and the service life to be longer.

Dust management

At present, dust collection machine is used for dust management, and the dust collection mode is divided into upper dust collection and lower dust collection or upper and lower integration.

Upper dust collection: it belongs to point-to-point dust collection. The design of pipes and dust collectors is relatively small. Since the air sub negative pressure is evenly distributed in each stressed area, the upper dust collection negative pressure and wind speed will be better. The milling cutter uses a right-hand cutter to carry the dust upward.

Lower dust collection: for products with high components on both sides, it is not convenient to install brushes on the spindle. The milling cutter uses the right cutter selection to remove the dust downward.

Upper and lower dust collection: only used by a small number of customers. It can be used due to the vent designed by the fixture and the particularity of the product. The reason is that the vacuum at the cutting point will be generated when the dust is collected up and down at the same time, resulting in unstable dust.