JPS6179501A - Cutting method of thin member - Google Patents

Abstract

PURPOSE:To prevent work section from deformation and slight waviness for the purpose of improving work efficiency by impregnating melted plastic into the spaces corresponding to the side opposite to the work face of the thin part of the hub of a wheel or the like and solidifying it. CONSTITUTION:A melted plastic 7 is impregnated into four spaces 6 divided by the bearing boss 3 becoming the center of a hub 1 in a rim 2 and four ribs 4 and is solidified after setting the hub 1 in a jig and before cutting the periphery. Although plaster is general for the material of the plastic 7 because of being cheap, the materials which can be melted and can be removed being heated at low temperature are desirable. Since the thin part is forced to keep its form from interior, even if some force is given by a cutting tool from exterior, it will not deform itself. Therefore, high speed heavy duty cutting is possible, and work efficiency is extremely improved.

Description

Detailed Description of the Invention (1) Industrial Application Field The present invention relates to a method for cutting thin-walled members, such as a circular hub constituting a wheel, which has a thin-walled rim portion and has a space inside. By having this, when it is necessary to cut the outer surface of various thin-walled materials having a part or all of the outer shell made thin, this can be accomplished with high precision and high efficiency.

(2) Conventional technology For example, when cutting the outer circumferential surface of a circular hub that constitutes a wheel for a two-wheeled vehicle, in most cases the shaft core is fixed to a rotating jig, and the jig is rotated at a constant speed while being sequentially cut. Processing is performed.

However, if the rim portion of the hub is thin, the workpiece itself may be distorted by the cutting force of the cutting tool against the workpiece during cutting, and the rim portion may be deformed by centrifugal force during rotation.

For this reason, it goes without saying that it is extremely difficult to perform uniform cutting across the circumference with high precision.

Therefore, in order to solve this conventional difficulty, it is possible to use a workpiece holder to fix the outer rim of a thin-walled workpiece in a fixed position, or to reduce the cutting force of the cutting tool to an extreme level during cutting. In addition, it was necessary to reduce the rotation speed of the workpiece.

(3) Problems to be solved by the invention However, in the case of using the above-mentioned conventional method, it is necessary to prepare a special holder to prevent deformation of the thin wall part of the workpiece and chatter during cutting, which increases the cost. Not only does it increase the cutting power, but it also weakens the cutting force of the cutting tool.
Alternatively, if the rotational speed of the workpiece is reduced, the work efficiency will be reduced accordingly.

(4) Means for Solving the Problems The present invention has been devised to solve the above-mentioned conventional difficulties. It is characterized in that the molten mold retaining material is injected and solidified.

(5) Examples In the following, the specific content of the present invention will be explained using as an example a case in which cutting is performed on the outer peripheral surface of the hub of a two-wheeled vehicle wheel. As shown in FIGS. 1 and 2, l is the entire hub. A thin material having a circular outer shape and having a space 6 formed inwardly and thinning the entire circumference of the outer shell, that is, a rim 2.
The bearing located at the center of the rim 2 is connected to the boss part 3; the rim 2 and the bearing are connected to the boss part 3, and a rib 4 connects them together to integrally connect them; A reinforcing flange 5 is provided along the inner circumferential surface of the flange 5.

After setting the hub 1 in a suitable jig and cutting the outer peripheral surface, the central bearing inside the rim 2 has four spaces partitioned by a boss 3 and four ribs 4. A molten mold retaining material is injected into the portion 6 to a thickness matching the width of the rim 2 to be cut and solidified.

Gypsum is relatively cheap and common as a melt-molded mold retaining material used here, but it also solidifies at room temperature and has a
Substances that can be melted at a relatively low temperature of about 00'C, such as wax or low-temperature melting metal solder,
Materials that can be easily removed from the hub by crushing or dissolving in water after the cutting process, including gold salts, etc., and preferably materials that can be melted and removed by heating at low temperatures;
More preferably, any material can be used as long as it has a melting point as low as possible for removal or can be reused after melting and removal.

(6) Effects of the Invention As described above, when cutting the outer surface of a rim or other thin-walled material, the present invention injects and solidifies a molten mold retaining material into the inner space to cut the thin portion of the thin-walled material from the inside. In order to retain the shape,
Even if an external force is applied from the outside by a cutting tool, the thin material will not be deformed (and work efficiency is significantly improved because high-speed heavy cutting work can be performed without the use of special jigs like in the past) In addition, high cutting accuracy can be maintained, and deformation during transportation between processes can be prevented.

Furthermore, after the cutting process is completed, the molten mold can be easily removed by crushing, water-melting, or low-temperature heating, and it can also be reused, reducing the cost of the product.
In addition, it greatly contributes to improving work efficiency.

[Brief explanation of the drawing]

Figure 1 shows the inner surface of a two-wheeled vehicle hub, and the bearing is secured by filling and solidifying a molten mold retaining material into three of the four spaces partitioned by four ribs extending radially around the boss. A side view of the molded state; FIG. 2 is a sectional view taken along the line A-A in FIG. 1; 1...Hub 2...Re
3...The bearing is the boss part 4...The rib 5...The flange 6...
・Space part 7...Inventor of molten molding material Shigeru Osawa

Claims (5)

[Claims] (1) A method for cutting a thin-walled member, which comprises injecting a molten mold retaining material onto the opposite side of the cut surface of the thin-walled member and solidifying the same, and then processing the cut surface. (2) The method for cutting the outer surface of a thin-walled material according to claim 1, wherein plaster is used as the melt-holding material to be injected and solidified into the space. (3) The method for cutting the outer surface of a thin material according to claim 1, wherein wax is used as the molten mold retaining material injected into the space and solidified. (4) The method for cutting the outer surface of a thin material according to claim 1, wherein the molten mold retaining material injected into the space and solidified is a low-temperature molten metal. (5) The method for cutting the outer surface of a thin-walled material according to claim 1, wherein a thermoplastic modeling material is used as the molten mold retaining material to be injected and solidified into the space.