What is the first test?

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What is the first test? Teach you to do the first test

In the design and production process of the charger, there are often activities such as design changes, process changes, process adjustments, unplanned suspensions, conversions, and transitions. So how do you ensure that these activities do not affect subsequent chargers? This requires a first-piece inspection during the job preparation verification and post-production verification phase.

1. Definition of the first piece and the first piece inspection

Process change: 5M1E (human, machine, material, method, ring, test) during production

Any one or more of the production factors have changed, such as personnel changes, equipment adjustments and repairs, refueling and changing fixtures, design changes, stop lines, and so on.

First piece: The first or first piece of charger processed by the production line at the beginning of each shift/production line production or after the process changes. For high volume production, the “first piece” often refers to a certain number of samples.

First item inspection: The inspection of the first or first few chargers processed by the production line at the beginning of each shift or after a change in the process. The quantity of inspection can be made according to the requirements of different companies or customers. In general, at least 3-5 pieces of chargers that are continuously produced must be inspected, and the subsequent chargers can continue to be processed. Strictly carry out the first inspection before any changes occur in the equipment or manufacturing process, and before each work shift begins.

2, the purpose of the first inspection

The first inspection in the production process is mainly to prevent the charger from being out of tolerance, rework, and scrap. It is a means to pre-control the charger production process, and is an important method for the quality control of the charger process. An effective and indispensable method for improving the quality of the charger

The first inspection is to find out the factors affecting the quality of the charger during the production process as early as possible, and prevent batch defects or scrapping. After the first inspection is qualified, it can enter the formal production, mainly to prevent the long-term practical experience of the batch of non-conforming products. The first inspection system is an effective measure to detect problems early and prevent the chargers from being scrapped in batches. Through the first inspection, it is possible to find systematic reasons such as serious wear of the fixture or installation positioning error, deterioration of measuring instrument accuracy, misreading drawings, feeding or formulation errors, so as to take corrective or improvement measures to prevent batch nature. Qualified goods occur

3. Timing/ occasion of the first piece inspection

1) Every work class starts

2) Replace the operator

3) Replace or adjust equipment and process equipment (including tool change or sharpening)

4) Change the technical conditions, process methods and process parameters (such as changes in roughness requirements, change of bore reaming to boring, change in the number of passes or speed in the NC program)

5) After the replacement of new materials or materials (such as material changes during processing, etc.)

6) Replace or re-test the bath (such as phosphating, nitriding, etc.)

4, the requirements of the first inspection

The first inspection uses three inspection systems: self-inspection, mutual inspection and special inspection:

The charger to be inspected must first be “self-tested” by the operator, and then “mutual inspection” by the team leader or colleague. Finally, the inspector “special inspection”, after confirming the qualification, can continue to process the subsequent charger.

Whether the first piece of inspection is qualified or not, it should be approved by the full-time inspector. The inspector should mark the first piece of the qualified charger and keep it until the class or batch of chargers are processed (all the first pieces). The charger must be sampled and used as a follow-up charger to see if the process has changed. Mark “√” with a marker to indicate the first piece of inspection).

If the first piece of inspection is unqualified, it is necessary to find out the cause and take measures. After the failure, the machine will be reprocessed and the third inspection will be carried out.

5. The main items of the first inspection

Whether the figure number matches the work order

Whether materials, blanks or semi-finished products and work orders match

Whether the material, the surface treatment of the blank, and the installation orientation match

Whether the formula ingredients meet the specified requirements

Whether the actual quality characteristics of the first charger after processing meet the requirements specified in the drawings or technical documents

6, the first inspection standard process

●Thematic content and scope of application

This document stipulates the requirements for the first inspection, the first inspection of the new product and the working procedures of the company during the production process.

This regulation applies to the company's control of the first piece of inspection and the first piece of inspection of the new product in the production process.