JPH0565452U - Cooling mold for overlay - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a mold structure that can demonstrate the lubricating function of graphite material by eliminating the use of copper material from the cooling mold for overlaying composite materials. [Structure] By fitting a graphite cylindrical lining material above the inner surface of the iron cooling jacket, the use of copper as the lining material can be eliminated and the cooling jacket can be formed by a single iron material. However, it is easy to deform, easy to weld and machine, and easy to make and modify. In addition, since the cooling rate is practically low, the lubricity of the graphitic cylindrical lining material is sufficient, and the occurrence of flaws on the lining material does not pose a problem.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a cooling mold for overlay welding, which is used when manufacturing a composite roll that is welded by high-frequency induction heating while continuously pouring a molten metal for overlaying which forms an outer layer material around a solid-phase core material. ..

[0002]

[Prior Art]

 Conventionally, as a structure of this type of buildup cooling mold, for example, there is one disclosed in Japanese Patent Publication No. 52-28646.

The structure of this mold is such that the inner surface of a cooling jacket made of metal such as steel having a low thermal conductivity is lined with copper having a high thermal conductivity, and the upper portion thereof is made of black lead. It is formed by forming a cooling buffer function layer that suppresses heat absorption to a predetermined level.

As a result, since the molten metal for overlay welding does not come into direct contact with the graphite layer after solidification, sliding flaws do not occur in the black lead lining, and the meat that is successively cooled and solidified in the lower water cooling jacket portion. It was said that sliding with the piled layer became smooth and there was almost no occurrence of wear defects.

[0005]

[Problems to be solved by the device]

 However, the copper-lined inner surface of the water-cooled jacket has poor weldability and workability of the copper itself, which requires time and effort to correct deformation during manufacture and use, and the material itself is expensive. It had been.

Further, in terms of lubricity required as a cooling mold material for the molten metal for overlay welding, in the case of the main overlay that the withdrawal speed of the overlay solidified body from the mold is about 5 to 50 mm per minute. In the method, a graphite material having a poor thermal conductivity is preferable to a copper material.

An object of the present invention is to provide a mold structure capable of exerting a lubricating function of a graphite material by eliminating the use of a copper material in such a composite overlay cooling mold.

[0008]

[Means for Solving the Problems]

 The overlay cooling mold of the present invention is characterized in that a graphite-made cylindrical lining material is fitted over the inner surface of an iron cooling jacket.

The graphite cylindrical lining material may be formed in the molten metal solidification portion, and may be an annular body having a short cylinder length.

[0010]

[Action]

 Since the cooling jacket is made of a single iron material, it has a simple structure, is not easily deformed, is easy to weld and machine, and can be easily manufactured and modified.

Further, since the cooling rate is practically low, the lubricity of the graphite cylindrical lining material is sufficient, and the occurrence of flaws on the lining material does not pose a problem.

[0012]

【Example】

 An example of an apparatus in which the cooling mold for overlay welding according to the present invention is applied to manufacture a composite roll for rolling will be described.

FIG. 1 is a sectional view showing an outline of the apparatus.

In FIG. 1, reference numeral 1 denotes a coil for preheating the core material A, and a tundish 2 made of a refractory material for accommodating the metal melt B for overlaying is disposed below the coil. Reference numeral 3 is a heating coil for heating the tundish 2 from the outside, and reference numeral 4 is a water-cooling type shielding plate for blocking the influence of the heating coil 3. The casting mold 5 according to the present invention is arranged continuously with the tundish 2 and the water-cooled shield plate 4. The casting mold 5 comprises an iron annular water-cooling jacket 8 having a cooling water inlet 6 and an outlet 7, and a graphite ring fitted and attached to a step 9 provided above the inner surface thereof. The lining material 10 is used.

The graphite annular lining material 10 is provided in a solidification region where the build-up molten metal B in the tundish 2 is gradually cooled and solidified on the core material A during the drawing process of the core material A. As such a graphite, one having a small amount of SiO ₂ having thermal conductivity and lubricity and having an appropriate strength can be particularly preferably used.

Further, the inner surface 11 of the jacket 2 below the fitting portion of the annular lining material 10 is formed outside of the inner surface of the annular lining material 10, and a gap g is formed between it and the overlay material B. It is provided.

The gap g has a function of preventing the roll surface immediately after solidification from being seized on the inner surface of the iron jacket having no lubricating ability.

[0018]

[Effect of the device]

 The present invention has the following effects.

(1) The structure itself is simple, consisting of a jacket made of a single iron material and a graphite cylindrical lining fitted to the jacket, and correction for manufacturing and repair is easy.

(2) The deformation of the mold itself is small and the quality is stable.

(3) Since the inner surface of the mold has a simple two-layer structure of graphite and iron, the cooling ability can be easily changed by changing the thickness of each.

[Brief description of drawings]

FIG. 1 shows an example in which the present invention is applied to a composite roll manufacturing facility.

[Explanation of symbols]

 1 Core material pre-heating coil A Core material B Overlay material 2 Tundish 3 Tundish heating coil 4 Water-cooled shielding plate 5 Casting mold 6 Cooling water inlet 7 Cooling water outlet 8 Circular water cooling jacket 9 Water cooling jacket Step portion 10 Annular lining material 11 Lower inner surface of jacket g Gap

Claims (1)

[Scope of utility model registration request] 1. A cooling mold for build-up, wherein a graphite-made cylindrical lining material is fitted in a molten metal solidification portion above an inner surface of an iron cooling jacket.