JPH0347719Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-frequency vibrating mold used in a continuous metal casting machine that casts molten metal while vibrating the mold at high frequency.

[Prior Art] FIG. 2 is a diagram showing the configuration of a high-frequency vibration mold (hereinafter abbreviated as a vibration mold in this specification) for continuous metal casting. Inner wall of vibrating mold 1, 1-1, 1
-2, 1-3, and 1-4 are made of Cu or Cu alloy. Outer wall 3, 3-1, 3-2, 3-3, 3
-4 is a reinforcing material. 4 is a connecting rod insertion hole, and high frequency vibration is transmitted to the inner wall 1 of the vibrating mold via the connecting rod 5 inserted into 4.

Figure 3 is a diagram showing the inner wall of a conventional vibrating mold.
B is the shape of the water channel provided on the excitation water cooling surface 2 (e.g. 2-1) of the inner wall 1 (e.g. 1-1), and B is the shape of the cooling water when the inner wall 1 and outer wall 3 (e.g. 3-1) are combined. It is a diagram showing a waterway. High pressure cooling water is available at water intake 22
It is introduced into the mold and discharged from the drain port 23.
The water channel inside the mold is narrowed by a water flow accelerator 8 provided on the vibrating water cooling surface 2, and the cooling water flows at high speed within the gap 14 formed by the slit 13, the outer wall 3, and the water flow acceleration portion 8. It flows and cools the inner wall 1. Reference numeral 6 denotes an excitation section provided on the excitation cooling surface 2, and high-frequency vibrations are transmitted to the inner wall 1 via the connecting rod 5.

The thickness of the inner wall 1 is desirably thin in order to lower the temperature of the contact portion with the molten metal and to prevent the attenuation of high frequency vibrations, and is usually 10 to 30 mm.

As described above, the vibrating water-cooling surface 2 of the inner wall 1 is exposed to high-flow cooling water and high-frequency vibrations. Cracks and erosion were severe in the portions 16 (points marked with ●) and immediately below the water-cooled acceleration section 8 (points marked with ●).

When cracks or erosion progresses in parts 15 or 16 of the vibrating water cooling surface 2, it is replaced with a new vibration mold, but this replacement is cumbersome and undesirable in terms of cost, so the occurrence of cracks and erosion is rare. A vibratory mold was desired.

[Problems to be Solved by the Invention] In the present invention, cracks and erosions are less likely to occur in the portions 15 and 16 of the vibrating water cooling surface 2. The purpose is to provide a vibrating mold that can withstand long-term use.

[Means for Solving the Problems] The present invention is based on a high-frequency vibration mold that vibrates an inner wall 1 made of copper or a copper alloy, in which an excitation part 6 of a cooling water channel is provided on an excitation water cooling surface 2 of the inner wall 1. The shape of the part 7 that obstructs the water flow and the part 9 that obstructs the water flow of the water flow accelerator 8 is determined by the slip angle 10 and the inclination angle 11.
This is a high-frequency vibration mold for continuous casting of metal, characterized by a water-dividing tip shape consisting of surfaces 12, 12' with an angle of 20° or more and 60° or less.

The present invention will be explained in detail below.

In FIG. 3, for example, 7 and 9 form local retention of cooling water in the cooling water channel. In the present invention, the cooling water channel is shaped to reduce such accumulation of cooling water.

FIG. 1 is a diagram showing an example of the shape of the cooling water channel provided on the vibrating water cooling surface 2 of the vibrating mold of the present invention.
1 and A-2 are overall views, B-1 and B-2 are enlarged views of the vicinity of the vibrating part 6, and C-1 and C-2 are enlarged views of the vicinity of the water flow acceleration part 8. Furthermore, A-1, B-1, C
-1 is a plan view, A-2, B-2, C-2 are E-
FIG.

For example, in 15, the retention of cooling water can be eliminated by changing the shape of the vibrating part 6 to the shape of the water dividing tip shown in FIG. Further, for example, by changing the shape of the water flow accelerator 8 to the water diversion tip shape shown in FIG. 1, the retention of cooling water can be eliminated.

It should be noted that the shape of this water dividing tip has a sliding angle 10 and an inclination angle 11 of 20° or more and 60° or less in Figures B-1 and B-2 and Figures C-1 and C-2.

[Function] As a result of research into the causes of cracks and erosion that occur at points 15 and 16 on the vibrating water-cooled surface 2, the present inventors found that these can be caused by the flow velocity of cooling water and high-frequency vibration. A portion where high pressure and low pressure repeatedly occur is created on the surface 2, and bubbles are generated and collapsed at and near the interface between the excitation water cooling surface 2 and the cooling water.
It has been learned that this causes damage to the excitation water cooling surface 2 due to so-called cavitation erosion.

Cavitation erosion also causes serious damage to the area where the generated air bubbles accumulate if they accumulate locally.Furthermore, as a means to prevent local accumulation of air bubbles, local accumulation of cooling water is recommended. We learned that solving this problem is extremely effective and came up with the present invention.

The present inventors also observed that in conventional vibrating molds, cooling water stagnates at points 15 and 16 on the vibrating cooling surface 2, and separated the shapes of the vibrating part 6 and the water flow accelerating part 8. By forming the tip into the shape of the water tip, we were able to eliminate the stagnation of cooling water and air bubbles. In this invention, the slip angle of the water dividing tip shape is 10 and the inclination angle is 1.
1 is set to be between 20° and 60°; however, at angles smaller than this, the effect of eliminating bubble retention is small. Next, although there are no particular theoretical restrictions on the upper limits of the slip angle and inclination angle, it is desirable to set them to 60° or less for processing and construction reasons.

[Effects] With the present invention, the cracks and erosion that had occurred on the vibrating water cooling surface 2 were eliminated, making it possible to significantly extend the life of the vibrating mold.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of the shape of the cooling water channel provided on the vibration water cooling surface 2 of the vibration mold of the present invention, Figure 2 is a diagram showing an example of the configuration of the vibration mold, and Figure 3 is a diagram of the conventional vibration mold. It is a figure showing the inner wall of a vibration mold. 1: Inner wall, 2: Vibrating water cooling surface, 3: Outer wall, 4: Connecting rod insertion port, 5: Connecting rod, 6: Vibrating part, 7: Point that obstructs water flow, 8: Water flow acceleration part, 9: Water flow Obstruction point, 10: Slip angle, 11: Inclination angle, 12,
12': Surface, 13: Slit, 14: Gap, 2
2: Water intake, 23: Drain.

Claims (1)

[Scope of utility model registration request] In a high-frequency vibration mold that vibrates an inner wall 1 made of copper or a copper alloy, the water flow at a location 7 that obstructs the water flow in the vibration part 6 of the cooling water channel provided on the water cooling surface 2 of the inner wall 1 and in the water flow acceleration part 8. The shape of the part 9 that prevents the sliding angle 10 and the slope angle 11
A high-frequency vibration mold for continuous metal casting, characterized by having a water-dividing tip shape consisting of surfaces 12, 12' with an angle of 20° or more and 60° or less.