JP4074973B2 - Die for thickness reduction press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold used for thickness reduction pressing.
[0002]
[Prior art]
Conventionally, in order to reduce the thickness of rolled material such as slabs and rough bars, a plurality of horizontal mills or reverse rolling mills have been used. However, the installation of multiple horizontal mills increases the equipment and costs, and the reverse rolling mill uses a pressing method that uses a mold for pressing. It was.
[0003]
FIG. 3 shows an example of a thickness reduction press. In the thickness reduction press 2, a reduction device is arranged vertically symmetrically with a slab 1 sandwiched in a frame 3, and this reduction device includes a reduction member 5 that moves up and down by the rotation of an eccentric crankshaft 4, and the reduction member 5 The mold holder 6 is attached to the slab 1 side and holds the mold 7, and the mold 7 presses down the slab 1. An electric motor is connected to the upper and lower four crankshafts 4 via a universal joint and a speed reducer (not shown), and the slab 1 is advanced while the electric motor is synchronously rotated.
[0004]
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 is fitted. The mold 7 is fitted into an opening provided in the mold mounting portion 6 a and is fixed with a bolt 8.
[0005]
[Problems to be solved by the invention]
The mold is exposed to high temperature because it contacts a high temperature slab, and is exposed to severe wear because it is pressed and contacted. For this reason, it is made of heat-resistant steel with wear resistance. With use, care such as re-polishing and build-up due to wear, rough skin, scratches, etc. is performed, but it is replaced with new ones when the damage becomes severe. The mold has, for example, a thickness of about 500 mm, a width of about 2000 mm, and a length of about 1500 mm, and is made of heat-resistant steel and is expensive. For this reason, it is uneconomical to dispose of the entire expensive mold, including most of the undamaged slab, only by damaging the surface in contact with the slab.
[0006]
The present invention has been made to solve such problems. That is, an object of the present invention is to provide a thickness reduction press die capable of replacing a severely damaged portion die.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, in a die of a thickness reduction press that is provided in pairs on top and bottom with a slab sandwiched between them, the die is laminated in the thickness direction of the slab. The contact mold on the side that directly presses one of the slabs is a heat-resistant mold, and the mounting mold on the other anti-slab side is a mold that has strength against the rolling load. The thickness of the contact mold is smaller than the thickness of the mounting mold, and the connecting portion of both molds is provided with a concave portion on one side and a convex portion that fits into the concave portion on the other side. The mounting mold is made of a material different from each other, the contact mold is made of a material having heat resistance, and the mounting mold is made of a material having strength against a rolling load. , One of the contact mold and the mounting mold on the contact surface of both Cooling grooves provided et flowing cooling liquid I, thereby blocking the heat to the mounting die from the contact mold.
[0008]
Molds are stacked in the thickness direction of the slab, the contact mold on the slab side is made of heat-resistant, for example, Ni-Cr heat-resistant alloy steel, and the mounting mold on the anti-slab side has strength corresponding to the rolling load. For example, it is made of Cr—Mn alloy steel. As a result, the slab side mold at the time of the rolling operation under high temperature can improve the wear resistance of the pressing surface in a high heat state, extend the life of the mold, and reduce the mold manufacturing cost. Moreover, since the thickness of the contact mold is made thinner than the thickness of the mounting mold, the amount of expensive heat-resistant steel used can be further reduced. When the contact mold is damaged, it is economical because only the contact mold needs to be replaced. Since the connection part between the contact mold and the mounting mold has a fitting structure of the concave part and the convex part, it is possible to prevent contact wear due to slippage of the contact part.
[0010]
One of the contact mold and the mounting mold is provided with a cooling groove for flowing a cooling liquid along the contact surface of both, and both the contact mold and the mounting mold are cooled by flowing the cooling liquid. Can shut off heat. As a result, the contact mold is heat-extracted and the life can be further extended. Further, the heat of the material of the mounting mold is reduced, so that the thermal influence is reduced, deterioration with time is suppressed, and it becomes possible to manufacture with a lower cost material.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a thickness reduction press mold 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, the same applies to the lower mold. The mold 7 is laminated in two layers in the thickness direction of the slab 1, the contact with the slab 1 is a contact mold 7a, and the one attached to the mold holder 6 shown in FIG. 4 is an attachment mold 7b. The thickness h2 of the mounting die is larger than the thickness h1 of the contact die 7a (h1 <h2), and the contact die 7a is made of heat-resistant steel (for example, Ni—Cr heat-resistant alloy steel) and attached. The mold 7b is made of a steel material (for example, Cr-Mn alloy steel) having strength against a rolling load. Thereby, the material cost of a metal mold | die can be reduced. At the contact part of both molds 7a and 7b, a convex part 10 is formed on the contact mold 7a, and a concave part 11 fitted to the convex part 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 recess 11 of the mounting die 7b, and a metal packing 13 is inserted into the packing groove 12 to seal leakage of coolant. To do. Inside the groove 12 for packing, the cooling water channel 14 is provided in the width direction of the slab 1, and they are connected as shown in FIG. 2 at both ends to form one water channel. An inlet 14a and an outlet 14b of the cooling water channel 14 are connected to a cooling device (not shown), and supply and discharge of a cooling liquid (usually cooling water) is performed.
[0012]
The transmission of the rolling load between the molds 7a and 7b is performed on the top surface of the convex portion 10 and the bottom surface of the concave portion 11, and the frictional force and the impact force are transmitted on the same surface as the transmission of the rolling load. 10 and the peripheral surface of the recess 11.
[0013]
In the above-described embodiment, an example in which the packing groove 12 and the cooling water channel 14 are provided in the mounting die 7b has been described. However, the packing groove 12 and the cooling water channel 14 may be provided in the contact die 7a.
[0014]
【The invention's effect】
As can be seen from the above description, the present invention is such that 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 mounting mold on the press mold holder side is inexpensive. By using a simple steel material, the cost of the mold can be greatly reduced. In addition, contact wear on the contact surface can be prevented by providing a fitting structure with concavities and convexities at the connection portion between the contact mold and the mounting mold. Furthermore, the life can be extended by cooling the mold.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an exemplary embodiment of the present invention.
2 is a cross-sectional view taken along the line XX of FIG.
FIG. 3 is a diagram showing 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 mounting part 6b Support part 7 Mold 7a Contact mold 7b Mounting mold 8 Bolt 10 Convex part 11 Concave part 12 Groove for packing 13 Packing 14 Cooling channel 14a Inlet 14b Outlet

Claims (2)

In a thickness reduction press mold that is provided in pairs on top and bottom across a slab, the mold is a laminated mold laminated in the thickness direction of the slab, and the contact on the side that directly presses one slab The mold is a heat-resistant mold, and the other anti-slab mounting mold is a mold that has strength against the rolling load, and the thickness of the contact mold is thinner than the thickness of the mounting mold. And the connecting part of both molds is provided with a concave part on one side and a convex part that fits into this concave part on the other side,
The contact mold and the mounting mold are made of different materials, the contact mold is made of a heat-resistant material, and the mounting mold is a material having strength against a rolling load. It is made with
One of the contact mold and the mounting mold is provided with a cooling groove through which a coolant flows along the contact surface of both, thereby blocking heat from the contact mold to the mounting mold. Die for pressing under thickness. The thickness reduction press die according to claim 1 , wherein the contact die is made of heat resistant steel, and the attachment die is made of a steel material having strength against a reduction load.

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