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Screws are part of a family of threaded fasteners that includes bolts and studs as well as specialized screws like carpenter's wood screws and the automotive cap screw. The threads (or grooves) can run right handed or left, tapered, straight, or parallel. There are two types of screws, machine and wood screws. Both are made of metal, however the machine screw has a constant diameter and joins with nuts while the wood screw is tapered and grips to the actual wood surface.

We are offering high performance screw making machine. Our screw making machine is designed and manufactured, to compete with the international market. These header machines are widely known for its durability and quality. These header machines are available at industrial leading price.

These cold heading machines are fully automatic and easy to operate with little training, fitted with Solid Die to produce blank for Bolts, Screws, Rivets and other similar components. Cut off and knock out mechanism have safety devices that will stop any major accident if any abnormal function occurs in machines.

The Screw Manufacturing Process

Machining is only used on unique designs or with screws too small to be made any other way. The machining process is exact, but too time consuming, wasteful, and expensive. The bulk of all screws are mass manufactured using the thread rolling method, and that is the procedure described in further detail.

Cold heading

1 Wire is fed from a mechanical coil through a prestraightening machine. The straightened wire flows directly into a machine that automatically cuts the wire at a designated length and die cuts the head of the screw blank into a preprogrammed shape. The heading machine utilizes either an open or closed die that either requires one punch or two punches to create the screw head. The closed (or solid) die creates a more accurate screw blank. On average, the cold heading machine produces 100 to 550 screw blanks per minute.

Thread rolling

2 Once cold headed, the screw blanks are automatically fed to the thread-cutting dies from a vibrating hopper. The hopper guides the screw blanks down a chute to the dies, while making sure they are in the correct feed position.

3 The blank is then cut using one of three techniques. In the reciprocating die, two flat dies are used to cut the screw thread. One die is stationary, while the other moves in a reciprocating manner, and the screw blank is rolled between the two. When a centerless cylindrical die is used, the screw blank is rolled between two to three round dies in order to create the finished thread. The final method of thread rolling is the planetary rotary die process. It holds the screw blank stationary, while several die-cutting machines roll around the blank.

Learn more about high speed screw thread rolling machine.

Threads can be cut into the blank by several methods. In the reciprocal method, the screw blank is rolled between two dies. In the cylindrical method, it is turned in the center of several rollers.

Threads can be cut into the blank by several methods. In the reciprocal method, the screw blank is rolled between two dies. In the cylindrical method, it is turned in the center of several rollers.

All three methods create higher quality screws than the machine-cut variety. This is because the thread is not literally cut into the blank during the thread-rolling process, rather it is impressed into the blank. Thus, no metal material is lost, and weakness in the metal is avoided. The threads are also more precisely positioned. The more productive of the thread-rolling techniques is by far the planetary rotary die, which creates screws at a speed of 60 to 2,000 parts per minute.

1. The precise and stable structure can make precise/mini rivets with flexibility.

2. China patented united formed punch lifting plank can diminish the cumulative deviation in assembly to ensure the stability of the lifting system.

3. The flexible lifting system ensures the efficiency of the machine.

4. Slide side guide can diminish the swing of punch holder.

5. Hard and stable foundation improves the rigidity of the machine and the stability of heading

Brève introduction des processus et des machines nécessaires:

(1). Pull the coarse line to the line patch needed. (Wire drawing machine)

(2). Adjust, produce, and form the head of screw on the heading machine. (Screw heading machine)

(3) .Grind dent sur la machine à rouler les filets de la bobine, et forme complètement la vis (Machine à rouler les filets)

(4). Treat the semi-finished screw in the heat treatment according to the standard (Heat treatment furnace)

(5). According to the requirements, process plating etc. (Zinc plating machine)

(6). Packing and out of factory

Why do we choose Somose screw making machines?

We are professional manufacturer of various kinds of screw, nail, rivets making machines, Which has over 18 years experience for producing screw production line. Not only have rich experience to produce high quality machine , but also with strong technical team as basis.