Machine de frappe à froid
What is cold heading?
Cold heading(cold forming) is feeding wire into a machine, cutting it into pieces, and hammering on it. The material is not heated or machined, but formed into its desired shape at room temperature. The ability to form material instead of removing it deems this process extremely efficient and cost effective when manufacturing large quantities.
In cold forming metal is formed at high speed and high pressure into tool steel or carbide dies. The cold working of the metal increases the hardness, yield, and tensile strengths.
Cold forming and cold heading processes are flexible. Parts can be hit multiple times while staying in one die ("one die, multiple blow"), or transferred from die to die to progressively form various geometries ("multi-die forming").
The range of possible shapes is rather broad, including heads, threads, steps, knurls, chamfers, grooves, undercuts, and tapers.
Some features that cannot be directly made with Cold Forming or Cold Heading can be added in secondary operations, such as threading, pointing, or rolling.
Typical parts made using cold forming technology include screws, nuts, and bolts, electrical contacts, and rivets. In addition to these "high volume standard" parts, there are many thousands of different custom parts for a diverse set of applications.
Cold heading operation process description
Cold forming equipment is typically a horizontal press that feeds wire, cuts the wire to an appropriate length which is then transferred through a series of tools and dies to form the material into a desired shape.
Cold heading machines form a metal blank into shaped parts by using a reciprocating ram to force a punch into a preformed die. Heat is not added during part manufacturing.
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 slug is then placed in front of the heading die by the cut-off knife. Once the slug is in the proper position in front of the heading die, a series of punches are used to strike the part. This is how a cold-formed fastener is processed.
Somose cold heading machine
Our one mould two stroke cold heading machinery which is one general high-speed cold heading machine specializing in the production of various types of ordinary screws products, it is in high speed, precision in accurate rate, in widespread used, low cost and high efficiency advantages.
Functions of heading machine:
(1). La machine appartient à la machine de frappe à froid, la fonction est le premier moulage et le second produit de poinçonnage, qui est principalement utilisé pour former les têtes des produits à vis, le principe de travail est le calibrage des matériaux de la ligne, les lignes d'accès, l'envoi des matériaux au principal. moule, premier poinçon forgeage initial, et deuxième poinçonnage des ébauches formées et retrait. Le travail se fait sans relâche, la capacité de production peut atteindre 150-180 pièces à la minute environ, ce qui fait partie des produits les plus avancés de la technologie actuelle.
(2). Upsetter divers matériaux: acier commun, acier au carbone, acier inoxydable, cuivre, aluminium, acier allié, etc. (Pour l’acier inoxydable et l’acier allié, vous pouvez les chauffer à la température appropriée avec le radiateur, et peut augmenter la température.)
(3). La machine peut fabriquer les produits courants tels que la vis autotaraudeuse, la vis électrique, la micro-vis, les boulons à tête cylindrique, la vis autoperceuse, la vis à plaque de fibre, etc., par exemple, PKO peut créer des conflits avec du matériel anormal et du métal non standard des produits.
Gallery：
Rivet making machine, semi-tubular rivet making machine ( Screw making machine, bolt making machine , rivet maker) being of precise and stable structure.
Features:
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
The following is a detailed description of the use of our cold heading machine to manufacture screws and bolts.
