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Fastener Machine Operation
Jun 28, 2017

A method of forging up a metal bar upsetting (often partial upsetting) at a normal temperature using a mold is generally used to manufacture the head of a screw, Fastener bolt, rivet, etc., generally on a cold heading machine. Can be reduced or replaced by cutting.

In short, it is a kind of processing method that gives the external force to the part and makes its shape change. The so-called "upset": that is, forging a, Fastener mainly to shorten the length of the parts, a way to increase the diameter

Hot forging: refers to the raw materials after heating after the stamping, the specific use of no special requirements, under normal circumstances are required to use cold heading, because such a surface finish, the material composition of the material will be more closely, there is more Large workpieces often use hot upsetting

Mainly applicable to the installation of steel in the ordinary bolts, Fastener torsional shear high-strength bolts, large hexagon head high-strength bolts, rivets, self-tapping nails, pull rivets, nails, anchor, anchor bolts and other fastening standard parts installed Construction methods and quality standards;

Installation of the construction before the construction of major equipment, equipment ready; all components, components prefabricated assembly inspection before installation of the construction site, Fastener the discharge material site ready to have the construction conditions;

★ all refer to the construction staff have participated in the construction technology to the end, clear the construction procedures, construction methods, installation procedures, Fastener quality standards, product protection and HSE technical requirements;

★ construction squad leader, the post shoulders construction drawings information, standard Atlas, construction and acceptance standards and other well-known;

★ arrival of the variety, specifications, performance, Fastener etc. should be consistent with the existing national product standards and design requirements, product quality documents. High-strength large hexagon head bolts and vice-torsional shear high-strength bolts connected to the factory should be with the box with a torque coefficient and fastening force (pre-tension) inspection report;

A) High-strength bolted connection shall be supplied in the form of packing box, and the batch number, specification, quantity and date of manufacture shall be indicated on the packing box. Bolts, nuts, washers appearance of the surface should be oil protection, should not appear rust and contaminated stolen goods, the thread should not be damaged;

B) ordinary bolts as a permanent connection bolts, Fastener when the design requirements or the quality of doubt, Fastener the bolt should be the minimum tensile load test, each type of bolt checks 8;

C) The high-strength large hexagon head bolts should be re-tested with the torque coefficient and issued a test report, each batch of eight sets of connected vice subtraction, Fastener re-test to calculate each group of 8 sets of sub-torque coefficient of the average should be 0.110 to 0.150, the standard deviation is less than or equal to 0.010;

D) Torsional shear high-strength bolted joints should be pre-tension re-inspection and issued a test report, each batch of eight sets of auxiliary sub-re-inspection, Fastener pre-tension average and standard deviation should meet the following requirements:

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