The use of non-standard screws made by cold heading machine, if the installed mold is bad, there will be a series of problems, we will detail the following related issues:
Non-standard screws
a, Shantou: Caused by improper adjustment of one impulse and two impulses, or the installation is too loose.
b. Split angle: Material problems, or improper adjustment caused by one stroke.
c. Poor installation and improper adjustment of the second flush.
d. The installation of non-standard screws is bad, and bad one-shot molding.
e, head is not round: a die is not adjusted.
f, mold cracks: mold cracking or improper R angle, so that the mold is scraped by two collisions.
g, burrs: poor one-shot forming, mainly caused by excessive gap between the punch and die holes or short punches.
h, head cracking: material problems, or the use of a wrong die (such as a pan head with a hexagonal die head die), and the reasons for the oil.
The above is a series of questions about the manufacturing of non-standard screws. If you have related problems in the manufacturing process, you can properly solve them according to the problems.
147,Non-standard screw industry will test products produced
Non-standard screw industry will test the products produced, such as special screws, non-standard screws and so on. After testing, it will find out where the product is unqualified and further improve its own product. In this way, we can provide customers with more quality products and win the favor of users.
Non-standard screws
The testing of non-standard screws in fasteners, appearance and quality requirements; appearance inspection of non-standard screws, inspection of plating layers. The thickness of the screw plating test can be verified with a micrometer, vernier caliper, plug gauge, etc. The magnetic method for measuring the thickness of a coating layer is a non-destructive measurement of a non-magnetic coating on a magnetic substrate using a magnetic thickness gauge; the microscopic method is called a metallographic method, and it is an etched fastener. Magnify on a metallographic microscope with a micrometer eyepiece to measure the thickness of the coating on the section; chronofluidic flow method.
The chronofluidic flow method uses a solution that causes the dissolved coating solution to flow on the partial surface of the coating, and the thickness of the coating is calculated based on the time required for the partial coating to be dissolved. There are plating drop method, anodizing Coulomb method and so on. Inspection of Adhesion Strength of Screw Plating: There are many methods for assessing the adhesion of the plating layer to the base metal, usually the following: friction polishing test; boring knife test; scratching method; bending test; thermal shock test; extrusion method. Corrosion resistance test of stainless steel screw plating: Test methods for plating corrosion resistance include: atmospheric explosion test; neutral salt spray test (NSS test); acetate spray test (ASS test), copper accelerating acetate spray test (CASS Test); Corrosion Erosion Corrosion Test (CORR Test) and Solution Droplet Corrosion Test; Immersion Test, Intermittent Corrosion Test, etc.