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The characteristic of milling processing is that the cutter rotates at high speed under the driving of the spindle while the workpiece is relatively stationary. The difference between turning and milling: turning is used to process the parts of the rotary body. The parts are clamped on the spindle of the machine tool through the three gripper chuck and rotate at high speed. Then the turning tool is used to follow the generatrix of the rotary body to cut out the product shape. The lathe can also process internal holes, threads, undercuts, etc., and the latter two are low-speed processing.

The selection of cutting fluid needs to be selected according to the processing material, equipment, process and other factors. Guangzhou liannuo chemical provides a variety of water-based and oil-based cutting fluids, including cutting fluids suitable for aluminum alloy, stainless steel, copper aluminum alloy and other processing. Precision machining requires high lubricity of cutting fluid. Generally, cutting oil is used. If cooling and cleaning are to be considered, microemulsion containing extreme pressure agent can be used; General water-based cutting fluid can be used for the processing of ordinary workpieces. It is recommended to use semi synthetic water-based cutting fluid, which has good lubrication, cooling and cleaning properties. However, for special materials, such as aluminum, copper and other non-ferrous metals, the corrosion and oxidation of metal materials by cutting fluid shall be considered.

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1. Judge whether the product quality is qualified.
2. Determine the product quality grade or severity of product defects to provide basis for quality improvement.
3. Collect quality data, and make statistics and Analysis on the data to provide basis for quality improvement.
4. When the supplier and the demander have disputes over product quality problems, the quality responsibility shall be determined.
5. strengthen the supervision and management of product quality and improve the product quality level.
6. define product quality responsibilities.
7. protect the legitimate rights and interests of consumers; 4、 Maintain social and economic order.

Effect:
The function of quality inspection is to check, prevent and report. That is, through the inspection of incoming raw materials, semi-finished products and finished products, as well as the inspection of processes in the production process and the inspection of finished products before leaving the factory, collect data, compare the inspected object with the technical requirements, and make a qualified or unqualified judgment.

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Full inspection, sampling inspection, counting inspection, physical and chemical inspection, destructive inspection, etc.

1. Total inspection
Full inspection is generally applied to: important, critical and valuable products; Items that have a decisive impact on subsequent process processing; Processes and products with seriously uneven quality; Non interchangeable assembly parts; Products with small batch and without sampling inspection. For example, it is suitable for the refrigeration effect of freezer, not suitable for the life test of TV, the strength test of steel pipe and the thread of a large number of nuts.

2. Sampling inspection
Sampling inspection, also known as sampling inspection, is a statistical method and theory to randomly select a small number of products (samples) from a batch of products for inspection, so as to judge whether the batch of products are qualified or not. It is different from comprehensive inspection in that the latter needs to inspect the whole batch of products one by one and pick out the unqualified products, while sampling inspection infers the quality of the whole batch of products according to the inspection results of the products in the sample.

If the inference result shows that the batch of products meets the pre-defined qualification standards, they will be accepted, otherwise they will be rejected. Therefore, a batch of products that are considered qualified through sampling inspection may also contain some unqualified products. The main sampling methods include simple random sampling, systematic sampling and stratified sampling.

3. Counting test
For each unit product in the sampling group, only qualified products or unqualified products are determined by measuring the inspection items, so as to infer the unqualified product rate of the whole batch of products. This kind of inspection is called counting inspection. The count value and quality data of counting inspection cannot be taken continuously, such as the number of nonconformities, the number of defects, the number of defects, etc.

4. Physical and chemical test
The methods of quality inspection can be divided into physical and chemical inspection and functional inspection according to the nature of inspection. Physical and chemical inspection, also known as “instrument inspection”, is the inspection carried out by using some measuring tools or instruments and equipment, such as micrometer, dial indicator, inspection gauge, microscope, etc. with the help of physical and chemical methods.

5. Destructive inspection
A destructive inspection is an inspection form or method that changes the form of the inspected product and destroys the use function or performance of the product to a certain extent.
Non-destructive inspection refers to the inspection form or method in which the form of the inspected product has not changed and the performance and use function of the product have not been affected after the product has been inspected.

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