JPS63281730A - Production of rim for wheel - Google Patents

Abstract

PURPOSE:To manufacture the rim for a wheel of high quality having good formability by fixing a cylindrical ingot to a rotary shaft after expanding it by rotating a die roll from the circumferential inner and outer faces and pressing a pressing member from the outer peripheral side with its rotating. CONSTITUTION:A pressing die roll 4 is inserted into the through hole 2 of the cylindrical ingot 1 of an aluminum alloy, etc. so as to coming into contact with the circumferential inner face 3 of the ingot 1, which is fitted between both rolls 4, 6 so that the outer face 5 thereof may be brought into contact with the rolls 6, 6 for driving. The ingot 1 is then expanded with rotating those in an arrow mark direction respectively. This expanded ingot 1 is cut in the slit 7 in an adequate width. This slit 7 of the ingot 1 is then fixed to the mandrel 10 having the outer peripheral shape formed in the final inner face shape of the rim of a spinning machine. Spinning is then executed by pressing the pressing member 13 fitting a roller 12 for the slit 7 with rotating this mandrel 10. The rim 14 for wheel having the inner face shape corresponding to said out peripheral shape 11 is thus formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing wheel rims used in automobiles, motorcycles, and other vehicles.

[Prior art]

Conventionally, the manufacturing method for wheel rims involves cutting a rolled sheet of steel or aluminum alloy to a certain size, winding the sheet into a ring shape, forming the end, flash butt welding, and applying paricant, planisher, and side burr cuts. One method was to perform a finishing process and then roll form. However, the welded part is prone to defects,
It just requires a complete air leak check process (,
The strength of the welded part is lower than other parts, so there is a problem with quality assurance of the welded part, and since the welded part has a different specific gravity compared to other rim parts, it is difficult to achieve rotational balance and there is a lot of molding. There were problems with the process.

In addition, in order to realize a seamless rim, there is a method of using extruded pipe as a material, but it is difficult to extrude a large-diameter thin-walled pipe that corresponds to the rim diameter and wall thickness.
It is necessary to perform drawing several times after extrusion, which not only increases the cost of the pipe, but also causes problems such as the inability to obtain uniform wall thickness.

[Problem that the invention seeks to solve]

The method for manufacturing a wheel rim according to the present invention is an attempt to solve these drawbacks, and to obtain a wheel rim with good moldability, high quality, and low cost.

(Means for Solving the Problems) The structure of the present invention is to fit a cylindrical ingot between at least two mold rolls so that the inner and outer circumferential surfaces of the ingot are in contact with each other, and While rotating the rolls, the ingot is expanded by gradually narrowing the interval between the mold rolls, and the expanded ingot is fixed to a rotating shaft, and while rotating the rotating shaft, the ingot is expanded from the outer circumference to the inside. This method of manufacturing a wheel rim is characterized in that the rim is molded by pressing a pressing member toward the circumference.

[Action of the invention]

The method of manufacturing a wheel rim of the present invention works by fitting a cylindrical ingot between two mold rolls so that the inner and outer circumferential surfaces of the ingot are in contact with each other, and While rotating, the ingot is expanded by gradually narrowing the interval between the mold rolls, and the expanded ingot is fixed to a rotating shaft, and while rotating the rotating shaft, the ingot is expanded from the outer circumference to the inner circumference. Since the rim is formed by pressing the pressing member toward the side, a seamless rim with high toughness can be manufactured economically and efficiently.

[Explanation of Examples]

Embodiments of the invention will be described based on the drawings.

First, as shown in Fig. 1(a), a continuously cast bar (hereinafter referred to as "ingot") 1 made of AI-8J-Mg aluminum alloy that has been cut to a certain width is shown in Fig. 1(b). As shown in the figure, a through hole 2 is made in the center thereof.

Next, as shown in FIG. 1C, the ingot 1 is provided with one rotatable press roll 4 on the inner circumferential surface 3 side of the ingot 1 and the outer circumferential surface of the ingot 1. Two driving mold rolls 6.6 are arranged on the 5 side, and the ingot 1 is fitted and held between both mold rolls.

Further, as shown in FIG. 2(d), while rotating the driving mold roll 6.6 in a fixed direction, the pressing mold roll 4 is gradually pressed against the driving mold roll 6.6. The ingot 1 is expanded.

Next, as shown in FIGS. 2(d) and (e), the expanded cylindrical ingot 1 is provided with slits 7 at regular intervals on its outer peripheral surface 5. and the slit 7.

Furthermore, if grooves (not shown) are formed in advance on the outer circumferential surface 8 of the pressing mold roll 4, as shown in FIG. The expanded ingot can be used as a non-slip for fixing it to the rotating shaft in the next process.

Next, as shown in FIG. 3(a), the expanded ingot 1 is fitted and fixed into a mandrel 10 fixed to a rotating shaft (not shown) of a spinning machine. Further, the outer peripheral shape 11 of the mandrel 10 is formed to match the final inner surface shape of the rim.

Next, as shown in FIG. 3(b), the mandrel 1
0, a pressing member 13 with a roller 12 attached to the tip is pressed against the slit 7, and the ingot 1 is pressed against the outer peripheral shape 11 of the mandrel 10, and spinning processing is performed. A rim 14 as shown in FIG. 3(c) is molded.

〔Effect of the invention〕

As described above, the method for manufacturing a wheel rim of the present invention involves fitting a cylindrical ingot between at least two mold rolls so that the inner and outer circumferential surfaces of the ingot are in contact with each other, and While rotating, the ingot is expanded by gradually narrowing the interval between the mold rolls, and the expanded ingot is fixed to a rotating shaft, and while rotating the rotating shaft, the ingot is expanded from the outer circumference to the inner circumference. Since the rim is formed by pressing the pressing member toward the side, a seamless rim with high toughness can be manufactured economically and efficiently.

[Brief explanation of drawings]

Figures 1(a) to (d) are perspective views showing the method for manufacturing a wheel rim of the present invention, and Figures 2(a) to (f) are shown in Figures 1(a) to (d). A cross-sectional view showing the shape of an ingot formed by the manufacturing method. FIGS. 3(a) to 3(C) are cross-sectional views showing the manufacturing method of the wheel rim of the present invention. 1 ... Ingot 3 ... Inner circumferential surface 4 ... Pressing mold roll 5 ... Outer peripheral surface 6 ... Driving mold roll 10 ... Mandrel 13 ... Pressing member 14 ... > Figure 1 of the rim drawing (a) (b) (C) (d) Figure 2 (0) (b) (C) (d)
(e) (f) Hayabusa 3! Sen3kojuho Seisho (Method) 1. Indication of the case: Japanese Patent Application No. 118276/1982 2, Title of the invention: Process for manufacturing wheel rims 3: Relationship with the person making the amendment: Patent applicant address: 1 name, 547 Horinouchi, Kikuyo-cho, Ogasa-gun, Shizuoka Prefecture
Asahi Malleable Iron Co., Ltd. Representative Toshihisa Gomi 4, Agent 29-29 Motojo-cho, Hamamatsu-shi, Shizuoka 430 5, Date of amendment order July 28, 1988 6, Subject of amendment 7, Contents of amendment (1), Figure 1 is corrected as shown in the attached sheet. Hand 3 sale (Hoshosho (self-proposal) dated August 27, 1986, Director General of the Patent Office Kunio Ogawa, 1, Indication of case: Japanese Patent Application No. 118276/1982 2, Title of invention: Process for manufacturing wheel rims 3, Relationship with the case of the person making the amendment Patent applicant address: 1 name, 547 Horinouchi, Kikuyo-cho, Ogasa-gun, Shizuoka Prefecture
Asahi Malleable Iron Co., Ltd. Representative Toshihisa Sumi 4, Agent 29-218 Motoshiro-cho, Hamamatsu-shi, Shizuoka 430 (Flower Building, 5th floor) 6. Subject of amendment (1), Detailed explanation of the invention in the specification In Column 1, Contents of Amendment (1), 7th line from the bottom of page 1 of the specification, "36 Title of the Invention" is corrected to "3. Detailed Description of the Invention."

Claims (1)

[Claims] By fitting a cylindrical ingot between at least two mold rolls so that the inner and outer circumferential surfaces of the ingot are in contact with each other, and gradually narrowing the gap between the mold rolls while rotating the mold rolls. The expanded ingot is fixed to a rotating shaft, and while the rotating shaft is rotated, a pressing member is pressed from the outer circumferential side of the ingot toward the inner circumferential side to form a rim. A method for manufacturing a wheel rim characterized by the following.