The Cold Heading Die, also called cold forming die, is a specialized die used in the process of cold heading, where a metal blank is formed into a part without heating. It is designed to form the head of a bolt, screw or other fasteners. The main die is the core component of the cold heading die, and it works together with the punch and the other components to produce the desired shape of the part.

We are a professional cold forging die manufacturers,various types of cold heading machines are available, cold heading die for screw moulds is general application,but for fastener production, it is common to find machines with one die two blow, up to five die six blow, and even more. The use of multi-die headers enables the production of more intricate parts in a single process, overcoming the limitations posed by the diameter ratio reductions.

In summary, the cold heading die and cold forging die is an essential tool for the production of high-quality fasteners. With its high-quality materials, precision machining, and customizable features, it can meet the demanding requirements of various industries and applications.

Cold heading dies include various types such as straight hole dies, triangular dies, extrusion dies, trimming dies, and socket dies. The method of cold pressing, shrink fitting, or taper fitting is chosen for the carbide inserts based on the specific application or customer requirements. Similarly, the carbide heading dies come in different variations such as plain hole, pointing, extrusion, trap extrusion, hexagonal, hex extrusion, flat extrusion, and trilobular to cater to the production of various types of fasteners, screws, and bolts.

Benefit:

• Increased efficiency: With excellent wear resistance, tungsten carbide cold heading dies have a longer lifespan, reducing downtime and increasing production efficiency.

• Cost savings: Tungsten carbide cold heading dies can produce a large number of screws with consistent quality, reducing scrap and material waste and lowering production costs.

• Versatility: Tungsten carbide cold heading dies can be customized to produce screws of various sizes, shapes, and thread designs, making them suitable for a wide range of applications.

The cold heading die bears the heavy pressing load, and its female die surface bears high-pressure stress so that the die core material is required to have high strength, toughness and wear resistance, tungsten carbide with high cobalt content(Most grades applied to the heading die core contains cobalt more than 12%, some even reach up to 25%) can perfectly meet this requirement, so all better heading die with long service time use tungsten carbide as die core material, and the outer case of the die is made of hot working die steel (the hardness after heat treatment is about HRC 45). The core is inserted the outer case by cold pressing or hot pressing method, so as to make the core and case combine tightly, and the outer case causes certain compressive stress to the inner core, which improves the service conditions of the die and extends the service time of the die.

Cold heading die(also mentioned as cold header dies) for fastener industry can be divided into cutting die, forming die, and trimming die as per the different production process of a fastener product, and forming die includes the first station, second station, third station, up to the fifth station for some complicated items. Divided by detailed fastener products, there are bolt die, screw die, nut die, hexagon nuts with flange die, drill point die etc. The carbide grade for flanged hexagon nuts is special,

In addition to cold upsetting, there is also a warm heading or hot heading process used in fastener manufacturing, especially for large size or complicated deformation fastener blanks, when cold heading may cause heading defects. HXY has a series of carbide grades for warm heading, hot heading and hot forging, below is the list:

Tips for heading die carbide grade selection:

1. If you have the experience to use a satisfied carbide material, you can choose a similar hardness carbide grade from HXY carbide to replace.

2. If there are two or more grades that can meet your needs, you can choose the harder carbide grade for the die core to gain a longer service time.

3. If you want to improve your heading die further or want to change to a better supplier, it is very important to describe the current problem of the current die to HXY salesperson, and if possible take show the picture of the broken point detail of the die, sometimes a problem may be caused by too hard grade, sometimes too soft, sometimes special formula grades may be needed, you can turn to HXY carbide’s professional engineer team for a solution.

Which cold heading machines are your cold heading dies suitable for?

1-Dies-2-Blow Cut-off Fingerless Heading Machine

• 2-Dies-3-Blow Precision Micro Cold Forged Bolt Former (round shears)

• 2-Dies-4-Blow Multi-Stroke Heading Machine

• 4-Dies-4-Blow Precision Micro Cold Forged Bolt Former

• 6-Dies-6-Blow Mini Cassette Bolt Former

• Open mold machine

• ls there a difference in the production cost of cold heading dies for internal hex bolts and external hexbolts?

• The production cost of cold heading dies for internal hex bolts and external hex bolts may differ depending on various factors, such as:

• Design and manufacturing cost of the dies: Internal hex bolts and external hex bolts have different shapes and sizes, which require different die designs and manufacturing processes, affecting the cost. The difference lies in the head manufacturing process, as the head structures are completely different and require different dies and processes. The head manufacturing cost of internal hex bolts is higher than that of external hex bolts due to the different head structures, with the cost of external hex bolts being only half that of internal hex bolts.

• Material cost: Internal hex bolts and external hex bolts may use different materials, which may also affect the cost. For example, internal hex bolts are usually cold-headed from solid bar stock, while external hex bolts are cut and machined from hexagonal rod stock.

• Processing cost: The production process of bolts using cold heading dies may involve multiple processing steps, such as cold heading, cutting, forming, cleaning, etc., and the cost of these steps may also differ depending on the type and quantity of bolts.

Therefore, when determining the production cost of internal hex bolts and external hex bolts, it is necessary to consider the above factors.

ZHUZHOU WISDOM MINING TECHNOLOGY COMPANY LTD. 

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Email: zztungsten@hxy-carbide.com

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