JPS59223129A - Manufacture of metallic c ring - Google Patents

Abstract

PURPOSE:To obtain inexpensively a metallic C-ring with high operation efficiency, by making a circular ring by joining both ends of a metallic tube of fixed length, and cutting a part of the circular section. CONSTITUTION:Both ends 11 of a metallic tube of fixed length having circular sectional form are butted and joined by welding etc. to form a circular ring 2. This circular ring 2 is held by a rotating jig 3, and cut along the direction of outer periphery of the ring 2 using a cutting tool 4 ect. and the circular sectional form is cut to C-shaped sectional form. When necessary, the worked end face is finish worked. In this way, a metallic C-ring can be manufactured without requiring complicated dies.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a metal CIJ song manufacturing method.

Metal C-rings are used as fixing gaskets, and in order to manufacture them, as shown in Figure 1A, a circular ring 1' (] 1' indicates a welding point) of a predetermined width is attached to the ring. As shown in FIG. 1B, a method is used in which a C-ring 2' is formed using roll-shaped molds arranged so as to sandwich the band portions on the inside and outside. However, the mechanism of the roll-shaped mold used during molding is complex, difficult to operate, and extremely expensive. It is necessary to manufacture such a mold for each size of the metal C ring, which makes it difficult to manufacture inexpensive products.

Furthermore, during molding, it is necessary to support the inner surface of the ring's C-shaped cross section with an insert roll mold, but in order to manufacture small-sized metal C rings, this insert roll mold must be made into an extremely small mold. Therefore, the manufacturing of the mold becomes complicated, and there are problems in that it is essentially difficult to manufacture extremely small-sized products.

The method for manufacturing a metal C ring according to the present invention is a method that can eliminate the above-mentioned disadvantages, in which both ends of a regular length metal tube with a circular cross section are joined to form a circular ring, and the ring is cured in the circumferential direction and cut. This method is characterized in that the circular cross section is made into a C-shaped cross section.

The present invention will be explained below with reference to the drawings.

Figure 2 A is a regular-sized metal tube with a circular cross section as a base material]
Seamless welded tubes (e.g. stainless steel cheap), plugged metal tubes, etc. can be used.

To carry out the present invention, first, as shown in FIG. 2B,
The circular ring 2 is obtained by abutting both ends 11 of the above-mentioned regular length metal tube and joining by welding. This circular ring can be formed by either welding both ends of a metal chip and then shaping it into a predetermined circular ring using a core formwork, or by shaping it into a circular ring and then welding it. good.

After obtaining the circular ring, as shown in FIG. , a cutting whetstone, or a rotary blade may be used) to cut the circular cross section into a C-shaped cross section (θ is 60° to 120° in the figure).

After cutting, finish the machined end face if necessary. Note that the opening side of the metal OIJ ring is not limited to the outer circumferential side as in the embodiments, but may of course be any of the inner circumferential side, upper side, lower side, etc. The cutting means in this case is well known, and its explanation will be omitted.

In this way, a metal C ring is obtained, which can be further plated and coated if necessary.

As mentioned by Ueda, the method for manufacturing a metal C ring according to the present invention is that the C-shaped cross section is formed by cutting a part of the internal cross section, which eliminates the need for a complicated and expensive mold as in the past. It has excellent workability and can be manufactured at low cost.

Furthermore, compared to conventional manufacturing methods, smaller-sized products can be manufactured.

[Brief explanation of the drawing]

Figures 1A and 1A are explanatory diagrams showing the conventional manufacturing method of metal C rings, and Figures 2A, 2B, and 2C are explanatory diagrams showing the manufacturing method of metal C rings according to the present invention. FIG. In the figure, 1 is a standard length metal tube, 11 is a welding location,
2 is a circular ring, and 4 is a bite.

Claims (1)

[Claims] A metal C characterized in that a circular ring is formed by joining both ends of a regular length metal tube with a circular cross section, and cutting is performed along the circumferential direction of the ring to make the circular cross section into a C-shaped cross section. How to make a ring.