Three Forms Of Process Inspection

According to the test results, the process is judged, that is, whether all the elements of the process are in a normal stable state, so as to decide whether the process should continue to produce.

In order to achieve this goal, process inspection is often used.

(1) first piece inspection:

The first inspection is also known as the "first inspection system". The first inspection system is an effective measure to identify problems early and prevent products from being scrapped in batches.

Usually, the first part inspection should be carried out under the following circumstances:

When the first, first batch of products was put into production,

Second, when the equipment is readjusted or the process is subject to major changes.

Third, shift or operator changes;

Fourth, when the material changes.

The first part inspection generally adopts the "three inspection system" method, that is, the operator should carry out self inspection, the class leader or the quality member will carry out the re examination, and the examiner will carry out the special inspection.

If the first part is qualified, it should be recognized by a full-time inspector. The inspector should put the required mark on the first product that has passed the inspection and keep it until the class or a batch of products are finished.

For a large number of products produced in large quantities, the "first piece" is not limited to one piece, but a certain quantity of samples.

(2) circuit inspection

The roving inspection is to check the workers in order to check whether the finished products conform to the requirements specified in the drawings, workmanship or inspection instructions according to a certain time interval and route to the work place or production site.

In mass production, roving inspection is generally combined with the use of process control charts. It is an important measure to alarm the abnormal state of production process and prevent batch waste.

When traveling inspection finds problems in the process, two tasks should be carried out:

The first is to find out the causes of abnormal operation and take effective corrective measures to restore their normal state.

The two is to re inspect and screen the products produced before the last inspection to the inspection, so as to prevent the unqualified products from flowing into the next process (or users).

Itinerant inspection is carried out according to the time sequence of production process, so it is helpful to judge the change of process production status with time process, which is very beneficial to ensure the quality of whole batch processing products.

For this reason, the products processed by the process should be stored in the order of processing time. This is very important, but it is often neglected.

(3) final inspection:

It is very important to set up the "final inspection system" to ensure the quality of rotating production by mould or device.

That is to say, after a batch of products have been processed, check the last processed product thoroughly. If there are any defects, the mold or device can be repaired before the next batch is put into operation, so as to avoid being discovered after the next batch is put into production, thus affecting the production because of the need to repair the mold.

Process inspection is an important part of ensuring product quality, but as mentioned before, the role of process inspection is not only a simple check, but also closely combined with process control to determine whether the production process is normal.

Usually, the use of the first check, inspection and operation instruction flow control is effectively coordinated.

Process inspection is not simply checking, but closely related to quality improvement, and turning the test results into information of improving quality so as to take action of quality improvement.

It must be pointed out that in any case, the process inspection is not only to reject the unqualified products, but to closely combine process control with quality improvement.

Finally, it is pointed out that two problems should be paid attention to in process inspection: one is to be familiar with the leading factors that affect the machining quality listed in the "process quality table"; the next is to familiarity with the requirements of process quality management for process inspection.

Process quality sheet is the core of process management, and is also one of the important bases for compiling "inspection instruction".

Process quality sheets are usually not directly sent to the production site to direct production, but various management charts, including inspection plans, should be established according to the "process quality sheet" to guide the production site.

The procedure for determining the quality inspection point should be the focus of process inspection. Besides inspecting and supervising the operators strictly implementing the rules of process operation and process management points, inspection personnel should also check the quality characteristics of quality checkpoints and the leading factors of their influence through inspection tour, check the inspection and recording of operators, and correct the operation, and assist operators in analyzing and taking corrective measures.