JP3011607U - Die holder for cold drawing of steel wire - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a die holder for cold drawing of a steel wire rod. A housing 1 having a hollow portion 2, a die holding ring 8 attached to a central portion of the housing 1 so as to hold a die 3, and defining a water-cooled chamber that seals the hollow portion 2, and a housing 1 Since the water supply pipe 6 is attached to the upper part of the housing and its tip extends to the lower side of the die holding ring 8, and the drain pipe 7 is provided in the substantially central part of the upper part of the housing 1, there is no water leakage and a uniform distribution. A die holder capable of cooling the die is realized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a die holder for cold drawing of a steel wire rod.

[0002]

[Prior art]

 Conventionally, a cold wire drawing machine is used for cold drawing of steel wire rods, but cooling is indispensable for the holder that holds the die. The mechanism of this cooling device will be briefly described with reference to FIGS. 2 (a) and 2 (b). 1 is a housing having a cavity 2 and 3 is a cavity 2 which is held via an O-ring 4. The die 5 is a cap fixed to the housing 1 to fix the die, 6 is a water supply pipe for supplying cooling water, and 7 is a drainage pipe thereof.

With this structure, the outer surface of the die 3 is directly cooled by supplying water from the water supply pipe 6 to the hollow portion 2 and circulating the water inside the hollow portion 2, and the water is drained from the drain pipe 7. At this time, the O-ring 4 prevents water leakage to the outside.

[0004]

[Problems to be solved by the device]

 By the way, when the die 3 is replaced for size change, etc., the cooling water from the water supply pipe 6 is stopped, the water inside the cavity 2 is drained, the cap 5 is loosened and removed, and the O-ring 4 and the die 3 are removed. Then, using a new die, it is attached to the housing 1 in the reverse order of the above, but at that time, the housing 1 is damaged due to a failure due to deterioration of the O-ring 4 itself, damage at the time of installation, or an error in cooling water pressure adjustment. Water leakage may occur from the gap, which may mix with the lubricant for wire drawing and reduce the lubrication performance, causing troubles such as wire drawing defects and wire breakage.

It is an object of the present invention to provide a die holder for cold drawing of a steel wire, which solves the problems of the above-mentioned conventional techniques.

[0006]

[Means for Solving the Problems]

 This invention is a holder for holding a die used when cold drawing a steel wire rod by a wire drawing machine, and a housing having a hollow portion and a die for holding the die at the center of the housing. A die holding ring that is attached to the housing to define a water cooling chamber that seals the cavity, a water supply pipe that is attached to the top of the housing and whose tip extends to the lower side of the die holding ring, and the housing. A die holder for cold drawing of a steel wire rod, which comprises a drainage pipe provided in an approximately central portion of an upper portion.

[0007]

[Work]

 According to this invention, since the die holding ring is attached to the cavity of the housing to define the water cooling chamber having the closed structure, it is possible to configure the die holder having no risk of water leakage. Further, since the tip of the water supply pipe is extended to the lower part of the die holding ring and the drain pipe is attached to the central portion of the upper part of the housing, the die holding ring can be cooled substantially uniformly, which allows the die to be cooled. Can be cooled as well as directly cooled.

[0008]

【Example】

 Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which (a) is a front sectional view and (b) is a sectional view taken along the line AA. In the drawings, the same members as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the drawing, in the die holder of the present invention, a die holding ring 8 having a predetermined thickness is provided in a cavity 2 in a housing 1, and the die holding ring 8 and the cavity 2 prevent the die 3 from moving. A closed water cooling chamber for cooling is defined. The tip of the water supply pipe 6 is configured to extend to the lower portion of the die holding ring 8, and the drainage pipe 7 is configured to be attached to the central portion of the upper portion of the housing 1. As a result, the cooling water is supplied to the lower side of the die holding ring 8 and drained from the center of the upper side, whereby the die holding ring 8 can be cooled substantially uniformly.

Therefore, a steel housing 1 having a height of 100 mm, a width of 100 mm, a depth of 60 mm and a thickness of 12 mm, a water supply pipe 6 having an inner diameter of 6 mm and a drain pipe 7 having an inner diameter of 8 mm, A die holding ring 8 having a thickness of 1 mm and an inner diameter of 42.05 mm was attached. Then, the die holding ring 8 was fitted with a die 3 having an outer diameter of 41.95 mm. At this time, the gap between the die 3 and the die holding ring 8 is as small as 0.05 mm.

The die 3 is made of an ultra-hard material, and the inner surface of the back of the housing 1 and the inner surface of the die holding ring 8 that come into contact with the die 3 are polished to a maximum roughness of 6.3 μm (▽▽▽) or less. did. With the die holder constructed in this way attached to a wire drawing machine, while supplying 30 l / min of cooling water at a water pressure of 8 kgf / cm ² , a mild steel wire with a diameter of 3.3 mmφ and a tensile strength of 65 kgf / mm ² was drawn. When drawn to 2.8 mmφ at 500 m / min, there was no traverse due to leakage of cooling water, and stable drawing was possible.

At this time, the temperature at the center of the front surface of the die is 120 ° C. at maximum, which is not much different from 115 ° C. in the conventional example, and it was confirmed that sufficient cooling can be performed using the die holder of the present invention. It was

[0013]

[Effect of device]

 According to this invention, the following excellent effects are exhibited. Since the dies are indirectly cooled, it is possible to prevent turbulence due to leakage of cooling water and mixing with the lubricant. Cooling efficiency can be improved by supplying water to the lower side of the die holding ring and draining water from the upper center side. By increasing the pressure and amount of cooling water, high-speed wire drawing is possible as with the conventional direct cooling method. The die can be removed easily by pushing it out from the back of the housing to the front.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a front sectional view, and (b) is a sectional view taken along the line AA.

FIG. 2 shows a conventional example, (a) is a front view, and (b) is a sectional view taken along the line BB.

[Explanation of symbols]

 1 Housing 2 Cavity 3 Dice 6 Water supply pipe 7 Drain pipe 8 Dice holding ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomiji Oishi, 1st Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture, Steel Research Laboratory, Kawasaki Steel Co., Ltd. (72) Hiroshi Akimatsu 1st, Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture Kawasaki Iron & Steel Co., Ltd. Steel Research Laboratory (72) Inventor Tokihiko Kataoka 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Kawasaki Steel Co., Ltd. Steel Research Laboratory

Claims (1)

[Scope of utility model registration request] 1. A holder for holding a die used when cold drawing a steel wire rod by a wire drawing machine, the housing having a hollow portion, and the die being held in a central portion of the housing. A die holding ring that is attached to define a water cooling chamber that seals the cavity, a water supply pipe that is attached to an upper portion of the housing and has a tip extending to a lower side of the die holding ring, and an upper portion of the housing. A die holder for cold drawing of a steel wire rod, which comprises a drainage pipe provided substantially in the center of the die.