How to operate cold heading machine?

nut bolt forging machine stucture
nut bolt forging machine dies

Cold heading machine uses a die at room temperature to forge the metal bar upsetting forming method, usually used to manufacture screws, bolts, rivets and other head, forging billet materials can be copper, aluminum, carbon steel, alloy steel, stainless steel and titanium alloy. Cold heading is mostly carried out on cold heading machines, which facilitate continuous, multi-station, automation. The cold heading machine can sequentially complete the processes of cutting, heading, gathering, forming, chamfering, rolling, reducing and cutting edges. The following is a brief introduction to the operation and use of cold heading machine equipment: What are the main points.

I. Characteristics of cold heading process

(1) According to the theory of metal plastic change, a certain pressure is applied to the metal billet at room temperature to produce plastic change in the mold cavity according to the specified shape and size.
(2) It is necessary to select high quality metal materials with good plastic change, and its chemical composition and mechanical properties have strict standards.
(3) cold heading bolts, nuts forming machinery has multiple models, multiple series of machine, reliable equipment performance, high efficiency, stable quality.
(4) The workpiece forming upsetting force is large, the configuration of power equipment is expensive.
(5) The workpiece has good surface quality, high dimensional accuracy, because there is cold work hardening in the upsetting process, the deformation should not be too large.
(6) Cold heading process is applicable to large quantities and various types of workpieces.

II.the operation of cold heading machine precautions

(1) The diameter of steel bar or steel wire should meet the requirements of multi-station cold heading machine, not cold heading too thick or too fine steel bar.
(2) Within the allowable range of cold heading diameter of multi-station cold heading machine, adjust the position of the fixture according to the required anchor head size in order to get the proper amount of reinforcing bar extension.
(3) The area in the cold heading part of the reinforcement shall be descaled and straightened.
(4) The end of the reinforcement shall be ground flat to ensure the accurate shape of the cold heading anchor head.
(5) The reinforcement shall be subjected to a tensile test after upsetting to check the strength of the anchorage head.
(6) Cut the blank with a semi-enclosed cutting tool, the easiest way is to use a sleeve type cutting tool.
(7) Each forming station should be equipped with punch rejection device and concave die should be equipped with sleeve type top material device.
(8) During the effective use period, the structure of main slide guide and process parts can guarantee the positioning accuracy of punch and concave die.
(9) Terminal limit switch must be installed on the baffle plate that controls the material selection, and attention must be paid to the control of heading force.

III.Three levels of maintenance system of cold heading machine

Routine maintenance of cold heading machine, first-level maintenance and second-level maintenance.
(1) The three-level maintenance system is the operator-based mandatory maintenance system for the equipment mainly to protect the main, warranty and emphasis.
(2) Institutionalization is to specify different maintenance cycles and maintenance time and strictly enforce them according to different conditions of different equipment.
(3) The regular maintenance work, to develop a quota of working hours and material consumption quotas and to be assessed according to the quota.
(4) Enterprises should regularly conduct self-inspection and mutual inspection, and carry out major equipment inspection.