Reasons for Dimensional Fluctuations of Wire Drawing Dies

 In wire processing, the wire is forced through a die by an external force, and the cross-sectional area of the wire is compressed to obtain the required cross-sectional shape and size.   


In this article, we will discuss the causes of dimensional fluctuations of wire drawing dies.

 

Reasons for Dimensional Fluctuations of Wire Drawing Dies

The Mould of The Cropping

 

Analysis of causes 

Die processing level

 

The influence of mold processing and production level on the quality of the mold is mainly reflected in two aspects; one is the hole size of the wire drawing die, and the other is the surface finish inside the die hole.
Foreign wire drawing die grinding process generally uses high-speed mechanical grinding machine, as well as the surface plated with diamond metal grinding needle, the equipment runs smoothly, the specifications of the grinding needle and the use of standardized, high precision products.
If you use manual operation to grind the hole pattern, it will be difficult to ensure the accuracy, so the processing and production level of the mold is a reason to affect the size of the mold.

 

Improper use

 

(1) The shrinkage of the drawing surface is too large, resulting in cracks or broken molds.
(2) Asymmetry between the drawing axis of the wire and the center line of the die hole, resulting in uneven stress effect on the wire and the drawing die.
(3)Uneven hardness of the wire caused by uneven annealing, resulting in premature fatigue damage to the diamond wire drawing die.
(4) wire surface roughness, surface adhesion oxide layer, sand or other impurities, etc. will make the die too fast wear.
(5) poor lubrication or drawing powder contains metal debris impurities lead to die wear.

 

Reasons for Dimensional Fluctuations of Wire Drawing Dies

Square Cross Fine Blanking

Ways to reduce fluctuation

Choose high quality

 

Try to use high quality drawing dies produced by advanced die processing technology, and choose drawing dies with good hole pattern design.
The longitudinal profile lines of all parts of the hole pattern must be straight, and a straight working cone has the least pulling force;
The intersection part of each part of the die must be obvious, so that each part can give full play to their respective roles and avoid the reduction of the transition angle on the actual length of the sizing area; the sizing area must be flat and of reasonable length.

 

Wire to be pretreated

(1) surface pretreatment: for the surface of the dirty, adhering more impurities of the wire, to be cleaned and dried before drawing.
(2) Heat treatment: For wire with excessive hardness or uneven hardness, reduce the hardness by annealing or tempering first and keep the wire with good hardness uniformity before drawing.

 

Regular maintenance

In the long-term use of wire drawing die, the wall of the die is subjected to strong friction and scouring of the metal wire, which will inevitably produce wear and tear, the most common is the appearance of circular grooves (dents) at the entrance of the wire in the work area. If not replaced in time to repair, then the ring groove will continue to accelerate the expansion, making it more difficult to repair.

 

In summary, to keep in the wire drawing production process to avoid the size fluctuations of the wire drawing die in addition to the selection of suitable die material, design a reasonable hole size, improve the manufacturing level of the wire drawing die, so that the surface finish of the die hole to meet the requirements of the process, but also must determine a reasonable channel compression rate to improve the conditions of use of the wire drawing die.


If you need to buy wire drawing die, please contact FENGFENG, we provide you with high quality products and perfect after-sales service.


Are the header die and tool high quality ?

Yes all products will be tested before bulk production, and we will check the physical properties, shape and tolerance for ensuring qualified products before shipping.

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