JPS59174214A - Die for manufacturing steel bar - Google Patents

Abstract

PURPOSE:To reduce remarkably maintenance cost by installing oppositely an upper nib and a lower nib at a nib installing part of a main body of machine frame and providing freely detachably guide nibs, used for maintaining the distance between the upper and lower nibs, to the left and right sides of the upper and lower nibs respectively. CONSTITUTION:A machine frame is formed into a rectangular or circular block- shaped steel as a conventional one is done, and a rectangular shape is hollowed in its central part to form a nib installing part 2. An upper nib 3 and a lower nib 4 are oppositely installed in the part 2, and guide nibs 5 for maintaining the distance (l) between the nibs 3, 4 are installed freely detachably at the left and right sides of the nibs 3, 4 respectively. As each nib is installed freely detachably in the frame 1, and when the nibs 3, 4 are worn out, only said nibs can be replaced; thus the maintenance cost is remarkably reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die for producing steel bars by cold drawing.

Conventionally, there are processing methods such as extrusion, rolling, drawing, and cutting to produce steel bars, but those produced by rolling methods cannot become polished steel bars due to low surface dimensional accuracy; Although it can be a polished steel bar,
It was not possible to manufacture wide, thick-walled steel bars. This is because the conventional die is integrally fixed to the machine frame body (A) in a solid state, as shown in FIGS. 1 and 2. Moreover, the nib (b) of this product was entirely molded from cemented carbide, so it had the drawback of being extremely expensive.

In view of the inconveniences and shortcomings of conventional processing methods, the present invention has been developed to produce steel bars that have higher surface dimensional accuracy than rolling processing methods, are wider and thicker than ordinary polished steel bars, are easy to maintain, and are inexpensive. It is an object of the present invention to provide a die for manufacturing steel bars used for cold drawing.

Hereinafter, an example of implementation of the present invention will be described based on the drawings.

The machine frame body (1) is formed into a rectangular or circular block shape made of steel as in the past, and the central part thereof is bored into a rectangular shape to form a nib installation part (2). The upper nib (3) and lower nib (4) are installed facing each other, and the upper and lower nibs (3) (4) are placed on the left and right of the upper and lower nibs (3) (4).
Guide nibs (5) that maintain the spacing (2) of 4) are each removably installed.

The upper nib (3) and lower nib (4) are made of cemented carbide and formed into a long, slender rod shape with an approach angle, bearings, etc., and are integrated into steel nib holters (6) and (7). Install the nib installation part (2) of the machine frame body (1) at the upper and lower positions with a required interval (L>) and install them in parallel in parallel.

The guide nib (5) (5) has an upper nib (3) and a lower nib (
This is to maintain the spacing (1) in 4), and is made of steel into a roughly T-shape, and is attached to the nib installation part (2) of the machine frame body (1).
Install it at the left and right positions of the upper and lower nibs (3) and (4) that fall inside, and the vertical part (5a) (5a>) of the upper and lower nibs (3)
(4) while supporting the left and right end surfaces of the horizontal part (5b).
Insert the guide nib (5b) between the upper and lower nibs (3) and (4), maintaining the gap between them.
) (5) Horizontal portion (5b) (5b) may be integrally equipped with a nib made of cemented carbide, if necessary.

Then, remove the upper and lower nibs (3) (4) and the left and right kite nibs (5).
) (5) are removably installed in the nib installation part (2) of the machine frame body (1), and the upper nib (3) and the left and right guide nibs (5) (5) are each tightened with the bolts (8). At the same time, insert the tightening metal (wedge) (9) between the upper nib (3) and the tightening bolt (8), and tighten each nib (3) (4).
(5) Integrally incorporate (5) into the nib installation part (2) of the machine frame body (1), and draw the steel material (10) through the upper nib (3) and lower nib (4). It is something.

The distance () between the upper and lower nibs (3) and (4) is changed by increasing or decreasing the thickness of the horizontal portions (5b) (5b) of the left and right guide nibs (5) (5).

In this way, the present invention has an upper nib and a lower nib installed in the nib installation part of the machine frame body so as to face each other, and guide nibs for maintaining the spacing between the upper and lower nibs are installed on the left and right sides of the upper and lower nibs, respectively, in a detachable manner. Therefore, by passing a steel material between the upper nib and the F part nib and drawing it, the surface of the steel material, at least the upper and lower surfaces, will have dimensional accuracy close to that of a polished steel bar, and it will also be possible to obtain a steel bar that is wider and thicker than a normal polished steel bar. can be easily manufactured.

Moreover, each nib is freely installed on the machine frame body, so if the upper and lower nibs become worn, only that nib can be replaced, which reduces maintenance and upkeep costs.
, and can be manufactured at a lower cost than conventional dies. Further, as in the embodiment, by attaching the nib to the nib holder and molding only the parts that are used from cemented carbide, it becomes easier to manufacture and can be provided at a lower cost.

Therefore, the intended purpose can be achieved.

[Brief explanation of drawings]

Figure 1 is a front view showing a conventional example, Figure 2 is a sectional view of the same, and Figure 3 is a front view of a conventional example.
The figure is a front view showing an example of the implementation of the dice of the present invention, and FIG. 4 is a sectional view taken along the line (4)-(4) in FIG. In the figure, (1) is the machine frame body, (2) is the nib installation part, (3) is the dobe nib, (4) is the lower nib, and (5) is the guide nib. - Shibutsu) Shi-4)

Claims (1)

[Claims] A die for producing steel bars, in which an upper nib and a lower nib are installed facing each other in a nib installation part of a machine frame body, and guide nibs are removably installed on the left and right sides of the upper and lower nibs to maintain the spacing between the upper and lower nibs.