CN105677934A - Design method for screening scheme of electronic devices - Google Patents

Abstract

The invention pertains to the field of screening technology of electronic devices, in particular to a design method for a screening scheme of electronic devices. The technical scheme is used for finding out a specified vibration spectrum according to different products and then for screening products by vibration on purpose based on the vibration spectrum. Compared with a conventional prior art, the screening result is more accurate with higher efficiency.

Description

The method of design of a kind of electronic product vibrations screening scheme

Technical field

The invention belongs to electronic product reciprocating sieve selecting technology field, it relates to the method for design of a kind of electronic product vibrations screening scheme.

Background technology

Environment stress screening is that product applies specific environmental stress in internal field, fast the defect introduced by aspects such as components and parts, material, production technique fluctuations of interiors of products is excited into the fault that can be detected and the process got rid of, its objective is to reject as early as possible the early stage fault of product, it is to increase line reliability. Due to vibration be one of main environmental factors causing product bug, therefore in environment stress screening process, vibratory stress be must stress. Correlation standard is produced the product 100% paid and is carried out environment stress screening test, and in order to ensure the effect of screening, a lot of product also to be carried out two-stage even three level screen.

The effect of vibratory screening determines primarily of following factor:

1, time of vibration;

2, the root-mean-square value acceleration of vibration spectrum;

3, the shape of vibration spectrum;

4, product is to the sensitivity of vibration spectrum.

By our line data statistics, in still taken place frequently by fault early stage after the product line that screens layer by layer, illustrate that our internal field screening degree has much room for improvement, this problem is also current the faced main problem of all products production producers. By research, we find to cause the major cause of vibratory screening weak effect to be: the vibration spectrum that vibratory screening all uses GJB1032-1990 to recommend at present, the formulation of this vibration spectrum considers the characteristic of most of product, but for a certain concrete product, under the prerequisite that vibration spectrum and time of vibration are determined, whether the vibratory response characteristic that vibratory screening the most direct whether efficient determinative is exactly this product is responsive to this vibration spectrum, and namely whether vibration spectrum is targeted.

Current vibratory screening all directly quotes the method that GJB1032 specifies, the specific aim of specific product is not strong, and the vibration energy in product sensitive bands may be not enough, it is easy to causes screening intensity not enough and causes the screening degree of product not high.

Summary of the invention

The technical problem that the present invention solves is: the vibratory response feature design of bonded products of the present invention has more vibratory screening method targetedly, low to solve vibratory screening efficiency, the problem of weak effect.

The technical scheme of the present invention is: described method of design comprises the steps:

Step 1, by existing vibratory screening process carries out combing and the investigation of interiors of products environmental response data, finds out the vibratory response present situation of existing vibratory screening process product;

Step 2, carries out product vibratory response test, it is determined that product vibration sensing frequency band;

Step 3, taking product vibration sensing frequency band as foundation, revises the GJB1032 excitation spectrum performed at present;

Step 4, interiors of products people for imbedding defect, it may also be useful to product is vibrated by existing GJB1032 vibration spectrum, and statistics defect precipitates out quantity;

Step 5, imbeds identical defect again at interiors of products, it may also be useful to the vibratory screening after improvement is initially composed and vibrated by product, and statistics defect precipitates out quantity;

Step 6, precipitates out the contrast of quantity, it is determined that the efficiency of the vibratory screening after improvement by two kinds of vibration failure, if efficiency is not enough, adjustable section, re-starts step 1,2,3, until obtaining satisfied efficiency;

Step 7, after confirming vibratory screening section, initially composes vibratory screening and carries out life loss assessment, if by the useful life that vibratory screening product loss is more, need profile control, repeat above step, until efficiency and life loss are all within acceptable scope;

Step 8, according to checking, assessment result, it is determined that final high-efficiency vibration screening method.

The useful effect of the present invention is: the technical program, according to different products, finds out specific vibrations general, then according to vibrations are general, product carries out vibrations screening targetedly, and compared with prior art this selection result is more accurate, and efficiency is higher.

Embodiment

Below the technical program is described in further details.

For specific product may to general vibratory screening section insensitive and cause screening intensity deficiency problem, first when product is used traditional method to screen by we, the vibratory response of three axis is tested, and carried out vibratory response investigation for product, fully grasp product to the sensitive bands of vibration, and based on this screening vibration spectrum is redesigned, improve the vibration energy in product sensitive bands targetedly to improve the validity of vibratory screening. After obtaining vibratory screening spectrum, vibratory screening effect has been confirmed by the mode inserted by fault. The good security to new vibratory screening has been assessed in addition, confirms to use new vibratory screening method to be safe concerning product.

Product vibratory screening section design procedure is as follows:

Step 1, by existing vibratory screening process carries out combing and the investigation of interiors of products environmental response data, finds out the vibratory response present situation of existing vibratory screening process product;

Step 2, carries out product vibratory response test, it is determined that product vibration sensing frequency band; In this step, treat testing product and apply the straight spectrum within 2000 hertz and encourage at random, the vibratory response characteristic of measure product, it is determined that product vibration sensing frequency band;

Step 3, taking product vibration sensing frequency band as foundation, revises the GJB1032 excitation spectrum performed at present, forms the initial spectrum of high-efficiency vibration screening (targetedly the excitation of the vibration in improving product sensitive bands magnitude);

Step 4, interiors of products people for imbedding defect, it may also be useful to product is vibrated by existing GJB1032 vibration spectrum, and statistics defect precipitates out quantity;

Step 5, imbeds identical defect again at interiors of products, it may also be useful to the vibratory screening after improvement is initially composed and vibrated by product, and statistics defect precipitates out quantity;

Step 6, precipitates out the contrast of quantity by two kinds of vibration failure, it is determined that the efficiency of high-efficiency vibration screening, if efficiency is not enough, adjustable section, re-starts step 1,2,3, until obtaining satisfied efficiency;

Step 7, after confirming that high-efficiency vibration screening section is efficient, carries out life loss assessment to the initial spectrum of high-efficiency vibration screening, if screening the more useful life of product loss by high-efficiency vibration, need profile control, repeat above step, until efficiency and life loss are all within acceptable scope;

Step 8, according to checking, assessment result, it is determined that final high-efficiency vibration screening method.

Claims (1)

1. a method of design for electronic product vibrations screening scheme, is characterized by described method of design and comprises the steps:

Step 1, by existing vibratory screening process carries out combing and the investigation of interiors of products environmental response data, finds out the vibratory response present situation of existing vibratory screening process product;

Step 2, carries out product vibratory response test, it is determined that product vibration sensing frequency band;

Step 3, taking product vibration sensing frequency band as foundation, revises the GJB1032 excitation spectrum performed at present;

Step 4, interiors of products people for imbedding defect, it may also be useful to product is vibrated by existing GJB1032 vibration spectrum, and statistics defect precipitates out quantity;

Step 5, imbeds identical defect again at interiors of products, it may also be useful to the vibratory screening after improvement is initially composed and vibrated by product, and statistics defect precipitates out quantity;

Step 6, precipitates out the contrast of quantity, it is determined that the efficiency of the vibratory screening after improvement by two kinds of vibration failure, if efficiency is not enough, adjustable section, re-starts step 1,2,3, until obtaining satisfied efficiency;

Step 7, after confirming vibratory screening section, initially composes vibratory screening and carries out life loss assessment, if by the useful life that vibratory screening product loss is more, need profile control, repeat above step, until efficiency and life loss are all within acceptable scope;

Step 8, according to checking, assessment result, it is determined that final high-efficiency vibration screening method.