18 years professional hardware manufacturer - JM Hardware
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18 years professional hardware manufacturer - JM Hardware
Cold heading is one of two ways of making a bolt from a piece of metal. The other is through screw machining, which involves simply cutting away material from a piece of metal until you are left with a shape that you can then add threads and a head to. As you can imagine, this is a process that can result in a lot of waste, particularly if you do not make an effort to recycle some of the material that has been produced after the process. However, it’s still one of the commonest and cheapest ways of making fasteners.
On the other hand, cold heading involves forcing a piece of metal into the desired shape without taking away any material. In a way, you can think of it as a form of molding, only that you use metal instead. The major benefits of using this manufacturing method is that you will be left with very little waste material at the end.
Steps for producing Cold heading bolts
Cold heading is done by a variety of cold heading machines. It involves moving metal through a series of dies to form the part to its desired shape.
Cold heading machines use a coil of wire and form the wire into desired parts at very high rates of speed allowing the cold-headed parts to be made very quickly and economically. The process begins by loading a large coil of wire in front of the cold heading machine. The wire is purchased in a condition called spherodized anneal. This special condition allows the material to be formed without cracking.
The wire is then pulled through a wire draw box to change the stock diameter to the specific diameter required to manufacture the fastener. Running the wire through a draw box makes the wire shape very round with a tolerance of .001. This is very important to holding size on the final parts after it is cold headed. A wire straightener can also be added which will align the wire prior to going into the cold heading machine. Straightening the wire is especially important on long parts.
After the wire has been successfully drawn to size, the wire enters the inside of the cold heading machine. The wire goes through a cut-off die and continues until it reaches a wire-stop. Once it reaches the wire stop, a cut-off knife moves across the wire, cutting it off to a specific length. This is referred to as the cut-off slug.
The specific steps of cold heading process at JM Hardware®
Step1：Find quality raw materials
Raw materials refer to the raw materials purchased from manufacturers, which mainly include the following parameters:
A. Brand
B. product name
C. Specifications
D. Material
E. Heat number or batch number
F. Number/weight
Round raw material at JM Hardware® factory
Step2：Wire drawing/Phosphating
Function
Wire drawing:
1. Rust removal
2. Pull until the specified wire diameter
Phosphating:
Smooth material surface to reduce damage to machine
Wire drawing/Phosphating at JM Hardware® factory
Step3：Cold heading
This contains head forming, punch marking,Reducing rod, chamfering, cutting off In one
Multifunctional cold heading machine at JM Hardware® factory
Step4：Thread Rolling
The thread rolling uses two plate-like tools with inclined teeth to move toward each other to squeeze the workpiece, forming threads on the surface of the workpiece.
Step5: Heat treatment (not necessary)
Heat treatment is a thermal process that accomplishes three primary improvements to the material properties of metal castings:
Improving mechanical properties.
Enhancing corrosion resistance.
Reducing residual stresses.
Heat treatment production line at JM Hardware® factory
Step6: Surface treatment
The surface treatment of fasteners is a process of forming a covering layer on the surface of the workpiece by a certain method,
and its purpose is to endow the surface of the product with beautiful and anti-corrosion effects.
plain (before) Blcak（after）
Step7: Sampling test
For the finished bolts, JM Hardware® will conduct sampling inspection to ensure the quality of our products
Step8: Package
JM Hardware® offers a variety of packaging options to ensure that products are delivered to customers intact.
Or you can also inform us of your packing requirements, we will do our best to meet your requirements
Step9: Transportation
JM Hardware® will carry out the most suitable shipping according to the trade method you choose
siple hero unit, a simple jumbotron-style component
Since our establishment in 2006, JM has been adhering to the mission of creating maximum value for customers by providing differentiated services, building a stage for employees to succeed, and making a positive contribution to the society.
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