Customized cemented carbide wire drawing dies tungsten carbide wire drawing dies



Precautions of Cemented carbide wire drawing dies

When using carbide wire drawing dies, it is usually necessary to pay attention to five points of caution: selection of equipment, pre-treatment of wire material, selection of suitable lubricants, abnormal handling and timely replacement of aging.


1. Equipment selection: according to the material you want to draw and drawing equipment, reasonable proportion of each channel of the compression rate of the drawing die, so as to determine the angle of the working area of the drawing die. (That is, what type of drawing die to choose)
2. Pre-treatment of drawing materials: such as cleaning, rust removal, annealing, phosphating, etc., to ensure the cleanliness of the material.
3. drawing powder, oil selection: the choice of high-quality applicable drawing powder (lubricant, oil), good cooling work of the drawing die.
4. Mold abnormalities in a timely manner: drawing when the mold cracking, blowing mold, sticky mold, scratching, shrinkage, broken wire, high temperature, mold black, not wear-resistant and other use of the problem please contact the professional and technical personnel in a timely manner.

5. Timely replacement of aging wire drawing die: wire drawing die to reach the service life, please timely change the wire drawing die for repair processing, so as to avoid the transition of the use of wire drawing die caused by the scrapping of wire drawing materials.


Grades and applications of Cemented carbide wire drawing dies

Cemented carbide wire drawing dies are widely used for drawing wire. Wire drawing is a manufacturing process used to reduce or change the cross-section of a wire by using a series of drawing plates or dies. Steel wire drawing, inside which a "nib" is inserted inside a steel casting of tungsten carbide.

Grade

Density g/cm³

Strength MPa

Hardness HRA

Applications

YG6X

14.95

1800

91.5

Suitable for making drawing dies with bore less than ¢6.00mm.

YG6

14.95

1900

90.5

Suitable for making drawing dies for non-ferrous round bars with bore less than 20.00mm and tubes with bore less than 10.00mm.

YG8

14.8

2200

89.5

Drawing dies for the production of round bars and tubes of steel and non-ferrous metals.

YG10

14.5

2400

88.5

YG15

14

2800

87

For drawing steel bars and tubes with high shrinkage.


Mould blanks processing

Cemented carbide wire drawing die core in the sintering process will produce shrinkage phenomenon, different batch number because of the composition, pressing and sintering process has a difference, shrinkage amount also has a large difference; die blank parts due to different shrinkage amount, often formed "saddle" or "flare" shape. The fluctuation of the mould billet dimensions, although in line with the mould billet standards, far exceeds the requirements of the overfill amount when the mould is set, resulting in serious uneven pre-stressing of the mould core during setting and a significant reduction in the service life of the mould, therefore, the mould billet must be cylindrically ground and needs to be ground on the grinding machine using a special fixture with diamond grinding wheels.

Mounting overruns

In order to achieve a certain pre-stress in the mould core, the diameter of the inner hole of the mould sleeve should be smaller than the outer diameter of the mould core, the difference between the two is called the interference. The difference between the two is called the interference. The interference is determined according to the size and deviation of the core, the pulling stress and the method of setting. Table 1 shows the actual amount of interference in the mould setting. The cold pressing method has two types: hot pressing and cold pressing. The cold pressing method has a small amount of interference, and the preload stress is also small.

Production process of Cemented carbide wire drawing die

Carbide wire drawing die blanks, die sleeve processing and die core mounting process should be noted in the main points; manufacturing of the main four steps: 1. processing of die blanks; 2. mounting of interference; 3. wire drawing die sleeve processing; 4. mounting process.

Mould bushing processing

Mold sleeve using lathe turning processing forming, processing control points are as follows.
(I) The inner diameter roughness of the die sleeve must reach 0.80 I.6 m, which is conducive to close cooperation with the die sleeve.
(2) The inner diameter of the die sleeve should correspond with the outer diameter of the die blank to ensure that the interference amount of each piece of mould is accurate.
(3) The bottom surface of the inner hole of the die sleeve must be parallel to the outer end of the mould and ensure that it is perpendicular to the centre line of the die hole after fitting.
(4) The oval of the bore of the die sleeve should be as small as possible, not more than 0.02 mm. The outer surface of the die sleeve should be polished and evenly cooled after mounting.

Mounting techniques

The cold press method is used to press mould blanks into the mould sleeve at room temperature. The cold press method requires an accurate amount of interference and high dimensional accuracy of the cemented carbide core and sleeve.






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