The design of the product structure is also very important. This is entirely a matter of experience. There is no shortcut. In this regard, each series has its own characteristics. Etc., shrinkage deformation caused by uneven wall thickness, etc., there are mainly the following types of screw prevention: three rib prevention, hoop prevention, neck prevention, stamping prevention, neck prevention due to the influence of technical process It is not used much, and most of them use the neck mouth to prevent it from falling. The realization of the above structure is based on the precondition that the plastic material is PA66. Here, it is necessary to explain the neck mouth prevention. Taking the screw as M3 as an example, the actual screw of M3 The outer diameter is φ2.90mm, so the size of the shell neck should be designed in: φ2.5-φ2.6, the thickness of the shell neck should be 0.4-0.5mm, and there should be a section under the screw head smaller than the shell neck. In order to ensure that the screw can be screwed into the thread smoothly, the production process should also be adjusted accordingly. The following is a statistical and solution plan for the structural problems of each series of products.
1. Aðalástæðan fyrir aflögun hins langa-talna fjölda samsettra vörusamsetninga er sú að ósanngjörn uppbygging veldur því að tveir skautfálkarnir eru í ójafnvægi að framan, aftan, upp, niður, vinstri og hægri krafta. Sýnt er að í burðarvirkishönnun ætti að huga að krafti og aflögun splæsuðu fálkanna. átt.
2. Vandamálið við að koma í veg fyrir að skrúfan detti af. Í þessu sambandi mæli ég með því að nota hálsmunninn til að koma í veg fyrir það eins mikið og mögulegt er, vegna þess að það kemur í veg fyrir vandræði af völdum þolsnákvæmni skrúfstöngarinnar og hringmunnsins samanborið við forvarnir fyrir hringmunninn. Og uppbyggingin er áreiðanleg og auðvelt er að stjórna þolinu.
3. The problem of salt spray test of screws and threaded steel parts after electroplating is based on the company's thread electroplating standard in 2012 (the coating is limited, but I think the thickness of the thread corresponding to the coating needs to be further determined) to solve this problem. When the electroplating process is normal, there are two methods, selecting the correct sealing agent and using the plating layer to electroplate multiple times. Both methods are to cover the pores generated by the screw that are invisible to the naked eye. The cost of electroplating in multiple times is high, so it is recommended to use the first method, and the key to this method is the research on the formula of the sealing agent.
