JP2000343174A - Mold for thickness draft press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for a thickness draft press, wherein a mold at the badly damaged portion can be exchanged. SOLUTION: A pair of molds for a thickness reduction press are arranged to sandwich a slab 1 from above and below so as to pressurization mold the slab 1. A lamination mold laminated in thickness direction of the slab 1 is used as a mold, and a contact mold 7a on one side for directly pressing the slab 1 is constituted with a mold with heat resistance, and a mounting mold 7b on the other side opposed to the slab is constituted with a mold having strength against pressurizing load. Thickness of the contact mold 7a is thinner than that of the mounting mold 7b. Also, at the contact part of the molds 7a and 7b, a concave part is provided on one side and a convex part to be fitted in the concave part is provided on the other side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a mold used for a thickness reduction press.

[0002]

2. Description of the Related Art Hitherto, in order to reduce the thickness of a rolled material of a slab or a rough bar, a horizontal mill has been provided in a plurality of stages or a reverse rolling mill has been used. However, when multiple horizontal mills are provided, the equipment becomes large, the cost is high, and the operation time is required in the reverse rolling mill. For this reason, a pressing method using a die has been used. Was.

FIG. 3 shows an example of a thickness reduction press. In the thickness reduction press 2, a reduction device is disposed symmetrically in the frame 3 with the slab 1 interposed therebetween. The reduction device includes a reduction member 5 that moves up and down by rotation of an eccentric crank shaft 4, It comprises a mold holder 6 attached to the slab 1 and holding the mold 7, and a mold 7 for pressing down the slab 1. An electric motor is connected to the upper and lower four crankshafts 4 through a universal joint and a speed reducer (not shown). The electric motors are rotated synchronously, and the slab 1 is pressed while being advanced.

FIG. 4 is a detailed view of the mold holder 6. The mold holder 6 includes a mold mounting portion 6a indicated by oblique lines and a support portion 6b to which the mold mounting portion 6a fits. The mold 7 fits into an opening provided in the mold mounting portion 6a and is stopped by a bolt 8.

[0005]

The mold is exposed to high temperatures due to contact with the hot slab, and further subjected to severe wear due to pressurized contact. For this reason, it is made of heat-resistant steel having wear resistance. With use, re-grinding, overlaying, etc. are performed due to wear, rough skin, scratches, etc., but if the damage becomes severe, it will be replaced. The dimensions of the mold, for example,
It has a thickness of about 500 mm, a width of about 2,000 mm, and a length of about 1500 mm, is made of heat-resistant steel, and is expensive. For this reason, it is not economical to dispose of the entire expensive mold, including most of the undamaged parts, only by the damage to the surface in contact with the slab.

The present invention has been made to solve such a problem. That is, an object of the present invention is to provide a mold for a thickness reduction press capable of replacing a mold in a severely damaged portion.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a die for a thickness reduction press which is provided in a pair at the top and bottom with a slab interposed therebetween and press-molds the slab. A laminated mold laminated in the thickness direction of the slab, a contact mold on the side that directly presses one slab is a mold having heat resistance, and a mounting mold on the other side of the slab is against a rolling load. It is composed of a mold having strength, the thickness of the contact mold is thinner than the thickness of the mounting mold, and the connecting portion of both molds has a concave portion on one side and a convex portion fitted on this concave portion on the other side. Is provided.

[0008] The dies are laminated in the thickness direction of the slab, and the contact mold on the slab side is made of heat-resistant, for example, Ni-Cr heat-resistant alloy steel. It is made of, for example, a Cr-Mn alloy steel having appropriate strength. Thereby, the slab-side mold at the time of the rolling operation under high temperature has improved abrasion resistance of the pressing surface in the high heat state, the life of the mold can be prolonged, and the mold manufacturing cost can be reduced. In addition, since the thickness of the contact mold is made smaller than the thickness of the mounting mold, the amount of expensive heat-resistant steel used can be further reduced. If the contact mold is damaged, only the contact mold needs to be replaced, which is economical. Since the connecting portion between the contact mold and the mounting mold has a fitting structure of a concave portion and a convex portion, contact wear due to sliding of the contact portion can be prevented.

According to a second aspect of the present invention, in order to make the first aspect of the present invention more effective, a cooling groove for flowing a cooling liquid is provided on one of the contact mold and the mounting mold along a contact surface between the two. Have been.

[0010] One of the contact mold and the mounting mold is provided with a cooling groove through which a cooling fluid flows along the contact surface between the contact mold and the mounting mold, and the cooling liquid flows to cool both the contact mold and the mounting mold. Heat can be shut off to the mounting mold. As a result, the contact mold is removed from the heat and the life can be extended. In addition, the heat of the material of the mounting mold is cut off, so that the thermal effect is reduced, the deterioration with the lapse of time is suppressed, and the material can be manufactured with a lower cost material.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a die for a thickness reduction press according to an embodiment of the present invention, and FIG. 2 shows a cross-sectional view taken along line XX of FIG. 1 and 2 show the upper mold, but the same applies to the lower mold. The mold 7 is laminated in two layers in the thickness direction of the slab 1, and the one in contact with the slab 1 is referred to as a contact mold 7 a, and FIG.
The mold to be mounted on the mold holder 6 shown in FIG. The thickness h of the mounting mold is greater than the thickness h1 of the contact mold 7a.
2 is thicker (h1 <h2).
a is made of heat-resistant steel (for example, Ni-Cr-based heat-resistant alloy steel), and the mounting die 7b is made of a steel material (for example, Cr-Mn-based alloy steel) having strength against rolling load. Thereby, the material cost of the mold can be reduced. Both molds 7a,
In the contact portion 7b, a convex portion 10 is formed on the contact mold 7a, and a concave portion 11 that fits with the convex portion 10 is formed on the mounting mold 7b. A packing groove 12 is provided around the bottom surface (the top surface in FIG. 1) of the concave portion 11 of the mounting die 7b, and the packing groove 12 is formed in the packing groove 12.
3 is inserted to seal the coolant leakage. Inside the packing groove 12, cooling water passages 14 are provided in the width direction of the slab 1.
Are connected at both ends as shown in FIG. 2 to form a single channel. Inlet 14a of this cooling water passage 14
The outlet 14b is connected to a cooling device (not shown) to supply and discharge a cooling liquid (normally, cooling water).

The transmission of the rolling load between the two molds 7a and 7b is as follows.
The transmission of the frictional force and the impact force is performed on the same surface as the transmission of the rolling load, and is performed on the peripheral surface of the convex portion 10 and the concave portion 11.

In the above embodiment, the packing groove 12,
Although the example in which the cooling water passage 14 is provided in the mounting mold 7b is shown,
It may be provided on the contact mold 7a.

[0014]

As is apparent from the above description, according to the present invention, the mold is laminated in two layers in the thickness direction of the slab, the contact mold on the slab side is made of heat-resistant steel, and the mold on the press mold holder side is formed. By configuring the mounting die with an inexpensive steel material, the cost of the die can be significantly reduced. In addition, by making the connection between the contact mold and the mounting mold a fitting structure with unevenness, contact wear of the contact surface can be prevented. further,
Cooling the mold can extend the life.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a diagram illustrating a configuration example of a thickness reduction press.

FIG. 4 is a diagram showing a configuration of a mold holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slab 6 Mold holder 6a Mold attaching part 6b Support part 7 Mold 7a Contact mold 7b Mounting mold 8 Bolt 10 Convex part 11 Concave part 12 Packing groove 13 Packing 14 Cooling water channel 14a Inlet 14b Exit

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Norio Iwanami 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries Co., Ltd. Yokohama Engineering Center (72) Inventor Ken-ichi Ide Isogo-ku, Yokohama-shi, Kanagawa No. 1 in Shin-Nakahara-cho Ishi Kawashima-Harima Heavy Industries, Ltd. Yokohama Engineering Center (72) Inventor Hajime Ishii No. 1, Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Ishi Kawashima-Harima Heavy Industries Co., Ltd. in Yokohama Engineering Center (72) Inventor Masao Mikami 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries Co., Ltd.In the Machinery and Plant Development Center (72) Inventor Takashi Nishi 1-1-1 Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa, Japan Heavy Industries, Ltd. Machinery & Plant Development Center (72) Inventor Hayato Murata 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 4E087 AA10 BA13 CA01 CB01 DA03 DB16 DB23 EC24 EC41 EC54 ED12 ED22 ED31 ED33 GA08 GA09 GA12

Claims (2)

[Claims] 1. A die for a thickness reduction press, which is provided in pairs vertically above and below a slab and press-molds the slab, wherein the die is a laminated die laminated in the thickness direction of the slab, and one of the slabs is directly The contact mold on the pressing side is a heat-resistant mold, and the other mounting mold on the opposite side of the slab is a mold having strength against the rolling load. A mold for a thickness reduction press, wherein the mold is thinner than a thickness of a mold, and a connecting portion of both molds is provided with a concave portion on one side and a convex portion fitted on the concave portion on the other side. 2. The metal mold for a thickness reduction press according to claim 1, wherein one of the contact mold and the mounting mold is provided with a cooling groove through which a coolant flows along a contact surface between the contact mold and the mounting mold. Type.