Parts processing needs to be inspected after production, which can not only detect defective products in processing and production, but also provides beneficial help for the use of products in subsequent work. The machining inspection report is one of the important documents delivered to customers. So, what is the factory inspection report for parts processing?

CNC Machining Equipment

First. Guidelines

1. Inspectors need to have more professional knowledge and practical work experience, and at the same time, they need to meet the requirements of the advanced products for the inspection work.
2. The measuring instruments used by the inspectors need to be verified by the metrology department and within the specified verification period.
3. The inspector needs to be familiar with the relevant drawings and technical documents before accepting the product, and understand the key dimensions of the parts and the key points of the assembly.
4. The inspector needs to judge the parts strictly in accordance with the requirements of the drawings and technical documents.
5. Inspectors shall mark the products in the workshop according to regulations.

Second. Inspection system

1. First inspection system: For the first part processed by each operator, a full range of inspections must be carried out and left as it is.
2. Inspection system: to ensure that the key parts will be in full control.
3. Sequence inspection system: the parts that are about to be transferred to the next process should be inspected to prevent unqualified products from flowing into the next process.
4. Completion inspection system: The completion inspection of the products that are about to be put into storage after the completion of production, including the size and shape, whether there are missing processing procedures, etc.

CNC lathe processing

Third. Inspection method

1. Basic size and shape inspection

(1) Measurement of outer diameter
When measuring the outer diameter, it is necessary to measure and record at two locations in the circumferential direction. When the length of the part with the same diameter is greater than 50mm, it should be checked for straightness. The working surface of the knife-edge ruler is in contact with the outer diameter bus bar, the width of the building is observed, and then the standard optical gap is used to judge.

(2) Measurement of inner diameter
When measuring the inner diameter of a part, just measure it at three locations in the circumferential direction and make a record at the same time. When the length of the same diameter is greater than 40mm, the cylindrical should be checked. Within the range of the length of the same diameter, two positions with a larger interval should be measured. Calculate the cylindrical error.

(3) Length measurement
External thread measurement: the middle diameter of the external thread is measured with a threaded ring gauge or three needles, and the small diameter is measured with a threaded ring gauge (through gauge).
Internal thread measurement: the outer diameter of the internal thread is tested with a threaded plug gauge (through gauge), and the middle diameter is tested with a threaded plug gauge.
The large, medium and small diameters of the thread should be checked and accepted according to the accuracy grade required by the drawing.
Effective length tolerance of thread: According to the requirements in HY/QT001 fastener inspection specification.

2. Detection of surface plane

(1) Surface roughness detection: use sample block comparison method for comparison and judgment.
(2) Flatness inspection: use the metering method to test, place three adjustable supports on the flat plate, place the measuring surface of the part on the support point, adjust the support point so that the three points are of equal height, and the measured value The peak-to-valley value is the flatness error of the plane.

The above is some experience summarized by the parts processing manufacturers, I hope it can help everyone and avoid being deceived. 7Swortds CNC Technology Co., Ltd. solves various processing technical problems for you