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Basic Types Of Quality Inspection In Shoe Design

2013/4/18 20:10:00 13

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1. incoming inspection (IQC, incoming quality contrl): /p >

the so-called purchase inspection mainly refers to the inspection of the original a href= "http://www.91se91.com/news/index_x.asp" > material > /a > purchased parts and outsourcing parts when the enterprise enters the factory. This is an important measure to ensure the normal production and ensure the quality of the products.

In order to ensure the quality of purchased materials, the inspection and inspection at the factory should be equipped with special quality inspectors and strictly and conscientiously tested according to the prescribed inspection contents, inspection methods and inspection quantities.

If we can not use the full inspection and only use the sampling inspection, we must provide a scientific and reliable sampling plan and acceptance system in advance.

incoming inspection includes two parts: first (batch) sample inspection and batch purchase inspection.

(1) first part (batch) sample inspection:

the purpose of the first sample inspection is to evaluate the quality level of the product supplied by the supplier and set up a specific measurement standard.

Therefore, the samples of the first lot inspection must be representative for future products, so that they can be used as the benchmark for future purchase.

(2) bulk purchase inspection:

batch purchase > a href= "http://www.91se91.com/news/index_x.asp" > test > /a > is to prevent unqualified raw materials, purchased parts and outsourcing parts from entering the production process of enterprises, so as to avoid producing unqualified products.

Batch purchase inspection can be classified according to A, B and C according to different situations. Class A is the key and must be checked; B class is important, full inspection or random sampling; C class is general, and sampling inspection or exemption can be carried out.

In this way, both quality and workload can be reduced.

Bulk purchase inspection can be carried out either in the supply unit or in the purchasing unit, but in order to ensure the quality of the inspection work and to prevent omission and wrong inspection, the "import inspection instruction" or "warehousing inspection detailed rules" should be generally formulated, and the form and content can be designed or specified according to the specific circumstances.

after the incoming materials have been inspected, the inspectors should make the inspection records and sign or seal them in the warehouses, notify the storeroom in time, and keep them well.

If the inspection is not qualified, all goods returned or handled should be handled according to the nonconformity management system.

For incoming inspection of raw materials and auxiliary materials, physical and chemical tests are often carried out, such as analysis of chemical composition, mechanical performance test and so on.

2. process inspection (IPQC, in process quality contrl): /p >

the purpose of the process inspection is to prevent a large number of unqualified products from appearing, and to avoid "a href=" http://www.91se91.com/news/index_x.asp "> unqualified < /a > products flowing into the next process to continue processing.

Therefore, process inspection should not only test products, but also check the main process elements (such as 4MIE) that affect the quality of products.

In fact, in the normal production of mature products, any quality problem can be attributed to the variation of one or more elements in 4M1E. Therefore, process inspection can play two roles: 1. according to the test results, the product should be judged, that is, whether the product quality meets the requirements of specifications and standards;

2. determines the process according to the test results, 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 combined with the use of control charts.

process inspection usually has three forms:

(1) first piece inspection:

first article inspection is also known as the "first inspection system". The first inspection system is an effective measure to detect problems and prevent products from being scrapped in bulk.

usually the first piece inspection should be conducted under the following circumstances:

first, first batch products begin to put into production;

Second, when the equipment is readjusted or the process has undergone significant changes,

Third, shift or operator change;

Fourth, when the material changes.

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

(2) circuit test

roving inspection is to check workers in a certain time interval and route, and then to work or production sites in order to check whether the newly processed products conform to the requirements specified in drawings, workmanship or inspection instructions.

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:

one is to find out the cause of abnormal operation and take effective corrective measures to restore its normal state;

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).

tour a href= "http://www.91se91.com/news/index_x.asp" > inspection < /a > is carried out according to the time sequence of production process, so it is helpful to judge the change of process production state 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 establish a "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.

we must point 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, the inspectors should also check the quality characteristics of the quality checkpoints and the leading factors of their influence through inspection tour, check the inspection and record of the operators and correct the operation, and assist the operators to analyze and take corrective measures.

3. final test (FQC, finally quality contrl): /p >

final inspection, also known as final inspection, refers to the inspection of semi-finished products or finished products after the completion of all processes in a processing or assembly workshop.

For semi-finished products, it often refers to the inspection before parts are put into storage.

Before the semi-finished products are put into storage, the full-time inspectors are required to carry out the full inspection or sampling inspection according to the situation. If the production workers carry out 100% self inspection during the processing, the sampling inspection can be carried out before entering the warehouse. Otherwise, the full-time inspectors shall be subject to full inspection before they can receive the warehousing.

However, when some enterprises carry out the sampling inspection, if they fail to meet the requirements, they must conduct full inspection and re screening.