JP2813038B2 - Wire drawing dies - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a drawing die.

(Prior Art) As a conventional example of providing lubrication to a die, see, for example,
No. -51156 is known. In this example, two dies are housed in a case, and a lubricating oil residue is formed between the dies. While the material enters into the dies and is processed on the processing surface, the lubricating oil smoothly moves in the presence of the lubricating oil. It is intended to do that.

(Problems to be Solved by the Invention) However, in the above-described conventional example, although lubricity can be expected to be improved to a certain degree, it is difficult to expect lubricity to be improved at an approach portion of a die where a material first comes into contact.

Then, the present inventor, when the die is a drawing die,
Various investigations and analyzes of the causes of the die being damaged during the wire drawing operation revealed that the following causes occupy a large weight. That is, in the case of wire drawing dies, so-called flaws called rings, craters, etc. are apt to be damaged. The approach angle is not well matched, the approach angle is widened like a trumpet, the lubricant (oil or powder) does not work well, and there is metal-to-metal contact. It has been found that the possible causes are that the die material is soft or the strand material is hard.

And, even if the regular dies, that is, the dies with the diameter of the wire and the approach angle are matched, the damage may still occur due to the extremely long drawing work, and in the case of such a case, wrap it on the processing surface of the dies early It has been found that the life of the dice can be prolonged as much as possible.

(Means for Solving the Problems) The present invention has been devised based on the above findings, and when a die is a drawing die, at least the element wire of the processing surface of the die hits first. A porous structure was formed at the site, and in addition, a lubricant was introduced and held therein.

(Operation) The drawing die has a machined surface that is continuous with the mouth, approach, bearing, and relief in order from the direction of entry of the wire, and the wire is drawn into a certain part of the approach by wire drawing. The abutment is narrowed down, and the wire is drawn with an outer diameter corresponding to the bore size of the bearing part. Lubricant introduced
Since it is held, the lubricating property in the vicinity of the part concerned is remarkably good, and it is difficult to form a ring or a crater. Of course, the lubricant is carried in with the intrusion of the strand into the machined surface after the above-mentioned portion, so that the lubricating properties of the bearing portion and the like are also improved.

(Embodiments) Details of the present invention will be described below with reference to the illustrated embodiments. The whole drawing die 1 is composed of a dice chip 2 and a case 3. The dice chip 2 has a mouth part 5, an approach part 6, a bearing part 7, and a relief part 8 in the direction of entry of the wire 4 (in the direction of arrow X). It has a continuous working surface 9 referred to as. As is well known, the approach portion 6 and the bearing portion 7 exert the most influence as the machining surface 9, and the strand 4 hits a certain portion A of the approach portion 6 first. Become. However, although the die chip 2 is made of cemented carbide,
Are formed in advance so as to have a porous structure, and the lubricating oil 10 is introduced and held in each minute-sized porous material.

In FIG. 2, the porous state of the porous portion 11 indicated by diagonal lines is set as a very small size so as not to impair the strength of the die chip 2 and not to damage the wire 4, Introduction of lubricating oil 10
It is of a size that can be held.

Accordingly, when the wire 4 enters the drawing die 1, that is, the die chip 2, the wire 4 first hits a certain portion A of the approach portion 6.
Is a porous part 11, into which lubricating oil 10 is introduced
The lubricating oil 10 is carried in with the intrusion of the wire 4 even when used for a long period of time because
Since the number of the die 10 is constant, the die chip 2 and thus the drawing die 1 can be extended without a pain.

(Effect of the Invention) Since the wire drawing die according to the present invention has the contents described above, it is difficult for the so-called ring or crater to be attached to the approach portion, and lubrication is caused by the presence of the lubricant in the porous structure portion. This has the effect that the properties are good and the life of the die can be extended.

[Brief description of the drawings]

 FIG. 1 is a partial perspective view of a drawing die and FIG. 2 is a partial sectional view of a die chip. 1 ... Die drawing die 2 ... Die chip 4 ... Wire 6 ... Approach part A ... The part which comes into contact with the beginning of the wire 9 ... Machined surface 10 ... Lubricating oil 11 ... Porous part

Claims (1)

(57) [Claims] In a die having a stay portion for a lubricant,
A drawing die, wherein the die is a drawing die, and a porous structure is formed at least in a portion of the processing surface of the die where the element wire first contacts, and a lubricant is introduced and held therein.