JPS597421A - Manufacture of metallic bat - Google Patents

Abstract

PURPOSE:To obtain easily and efficiently bat on which a grip is consecutively provided as one body in the end part of a grip part, by forming a metallic pipe by a rotary swaging method. CONSTITUTION:A pipe 1 of a light alloy, which has the thickness corresponding to the thickness of a bat to be obtained is set to a rotary swaging machine, and a pair of upper and lower rotary dies 2, 3 are moved from its important part toward the root part and are hit strongly. In this case, the diameter of the important part of the pipe 1 is reduced 1a gradually, and the outside diameter of the reduced diameter part 1a is nearly equalized to the diameter of a grip 6. Subsequently, the interval of the dies 2, 3 is reduced, or dies 4, 5 whose interval is narrow are used, and the dies are hit so that its tip is bitten into the reduced diameter part 1a, are moved in the direction of the root part of the pipe 1, and are stopped immediately before the root part. In this case, a shape of die tip part sides 4a, 5a of the pipe root part is equal to a shape of an inclined face of the grip 6 to be obtained, and the interval of both the dies is equal to the diameter of a grip part 1b of the final product.

Description

[Detailed Description of the Invention] Conventionally, in order to manufacture a metal bat, a light alloy pipe is usually drawn into a tapered shape, and a camp-shaped grip of a slightly larger diameter, which is manufactured separately, is welded to the tip of the pipe. Ta. Therefore, manufacturing is time consuming and costly, and great care is required to maintain product reliability.

In order to eliminate such defects, it is possible to form a grip by expanding the diameter with a tapered end t or an expander, but cracks may occur due to work hardening that accompanies the drawing process. There are many cases and it is not practical.

The present invention relates to a method for manufacturing a metal bat that eliminates the above-mentioned drawbacks of the conventional method by applying a rotary swaging method, and will be described below with reference to the drawings.

As shown in Figure 1, a light alloy pipe (1) with dimensions corresponding to the thickness of the bat to be obtained is hung on a rotary swaging machine. By moving the pair of rotating dies (2) and (3) and vigorously hitting the die, key points of the nozzle (1) are gradually reduced in diameter (1a).

The outer diameter of this reduced diameter portion (1a) is approximately equal to the diameter of the grip (6) in the final product as shown in FIG.

Next, as shown in FIG.
), or a rotating die (4) having a smaller mutual spacing than the rotating dies (2) and (3).
(5), move it toward the proximal end of the pipe (1) while striking it so that its tip bites into the reduced diameter part (1a), and stop just before the proximal end.

At this time, the rotating die at the base end side (C) of the pipe (1) (
4) Tip part 9111 surface of (5) (4a) (5a) 17
) shape is equal to the shape of the inclined surface of the grip (G) to be obtained, and the mutual spacing between the two dies (4) (51) is equal to the diameter of the grip part (1b) in the final product.

By rotary swaging in this way,
As shown in Fig. 6, the grip υ part (
A product is obtained in which a grip (6) of a desired diameter that expands in a trumpet shape is connected to the end of 1b).

A metal bat is completed by fitting a suitable base into the end opening of the grip (6).

According to the present invention, when the rotary swage method is used, KX, C, from one metal pipe to the end of the grip part,
Batke with integrally connected grips allows for continuous work and can be manufactured easily, quickly, and efficiently.

[Brief explanation of the drawing]

Figure 1 is a simplified longitudinal sectional front view for explaining the implementation procedure of the present invention. Figure 1 shows the diameter expanded state as the first step. FIG. 2 shows a state in which the grip portion is formed as the second step. Figure 6 shows the state of forming Grino 7'' as the final step. (1) Pipe (1a) Reduced diameter part (7b) Grip part (2) to (5) Rotating die (6) Grip part

Claims (1)

[Scope of Claims] By striking a metal pipe having a thickness corresponding to the thickness of the bat to be obtained while moving rotating dies facing each other toward the base end of the metal pipe, υ, Reduce the key points of the pipe to a diameter that is approximately equal to the diameter of the grip to be formed, and then reduce the mutual spacing to approximately the same diameter as the grip V portion to be formed, and the side surface of the distal end on the proximal end side of the pipe. The whole rotary die, whose shape is almost the same as the shape of the inclined surface of the grip to be formed, is moved toward the base end of the pipe while being struck so that its tip bites into the reduced diameter part, and the base end A method for manufacturing a metal bunt, characterized in that a grip 9 part and a grip connected to an end part thereof are simultaneously formed by stopping just before the part.