JPS62261767A - Manufacture of taper plug - Google Patents

Abstract

PURPOSE:To prevent production of burrs being apt to produce at an opening edge part, by a method wherein, in prior to taper machining of a taper plug for gas cock, chamfering machining is applied on at least the opening edge part on the one side in a circumferential direction of the opening end of a through-hole. CONSTITUTION:In prior to taper machining, chamfering machining is applied on at least an opening edge part 6 on the one side in a circumferential direction of the opening end of a through-hole 3 to form the opening edge part 6 in the shape of an obtuse angled projected part. A cutter 7 is used for chamfering machining, and in the opening edge part 6 of the opening end, either the one side or the other side is chamfered to provide an obtuse angled projected part. When subsequent taper machining is effected by means of a cutter 5, burrs, being apt to produce in the case of a conventional acute angled projected part, are prevented from production especially in relation to the right opening edge part 6 on a peripheral surface.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention mainly relates to a method of manufacturing a taper stopper for a gas cock.

(Prior art) Conventionally, as a method for manufacturing this type of taper stopper, for example, the first
As shown in Figures to 3, a hole forming process is carried out to form a passage hole C opening on the circumferential surface of a cylindrical columnar body a, and then a taper surface d is formed by cutting the layer surface. A type is known in which a product is obtained by processing, and the product is then fitted into a cock body e as shown in FIG. 4, for example, to obtain a gas cock as a whole.

(Problems to be Solved by the Invention) However, according to the above manufacturing method, the cross-sectional shape of the opening end of the passage hole C is as shown in FIG. An acute-angled convex portion is obtained as shown by the chain line in the figure, which is then removed by cutting with a blade f during the taper process, resulting in the state shown by the solid line in the figure.
In this case, a burr h extending forward in the cutting direction is likely to be formed on the mouth edge q, and this burr causes grease clogging and makes gas control difficult, so it must be removed manually or otherwise. It is inevitable that it will be troublesome.

(Means for Solving the Problems) The object of the present invention is to provide a method that is free from the above disadvantages, that is, a method that does not generate burrs. In a device in which a taper plug is obtained by performing a drilling process to form a passage hole that opens, and then a taper process to form the peripheral surface into a tapered surface, the opening of the passage hole is formed prior to the taper process. The mouth edge on at least one side in the circumferential direction of the end is chamfered to form the mouth edge into an obtuse-angled convex portion.

(Example) Embodiments of the present invention will be described with reference to the attached drawings.

Figures 16 to 12 show one example. (1) shows a cylindrical columnar body, and the columnar body (1) has a circumferential surface (
The product is manufactured by performing drilling to form a passage hole (3) opening in 2), and then tapering to form a tapered surface (4) by cutting the peripheral surface. is not particularly different from the conventional one. In the drawing, (5) shows a cutting tool for cutting the outer periphery for the taper process.

According to the present invention, prior to the taper processing, the passage hole (3
) at least on one side in the circumferential direction of the opening end (6)
A chamfering process was applied to the opening edge portion (6) to form an obtuse-angled convex portion.

To explain this in detail, in the illustrated example, a rotary cutter (7>
The cutter (7) cuts the drawing (2) at the opening end of the passage hole (3), and the resulting chamfered portion (8) is as shown in FIG. It has a rectangular outline, and its cross-sectional shape is, for example, as shown in FIG.
), both the one side and the other side are chamfered to obtain an obtuse-angled convex part as shown in the figure, and thus, during the subsequent taper machining with the cutter (5), especially the right side of the circumferential surface is chamfered. Regarding the mouth edge (6), there is no occurrence of cracks that tend to occur in the case of conventional acute-angled convex parts.

In this case, when the machining allowance due to the chamfering process and the machining allowance h2 due to the taper process are matched correctly,
As shown in the figure, the mouth edge (6) is formed into an acute-angled convex part (6a) on the inner side at the product stage, which provides a good sealing property for the eye area. It is not always easy to achieve this goal. That is, the cutting allowance h2 due to the taper process gradually increases along the length direction of the columnar body (1) from the root side to the tip side, whereas the cutting allowance h1 due to the chamfering process increases in the length direction. Therefore, it is impossible to always match the cutter (h) at each point in the length direction, and in order to eliminate this inconvenience as much as possible, the cutter (7) is Use the one shown in Fig. 14 and make the cutting allowance.

It is conceivable to increase the amount in advance toward the distal end. Changes in the chamfered portion (8) in this case are as shown in FIGS. 15 to 17, for example.

Furthermore, it is also effective to gradually reduce the reshaping from the central part of the opening end in the longitudinal direction. In this case, use the cutter (n as shown in FIG. 18, for example). use something.

Changes in the chamfered portion (3) in this case are as shown in FIGS. 19 and 20, for example.

Furthermore, the cutter (D) can be made as shown in FIG. 22, and in this case, the chamfered portion (8) changes as shown in FIGS. 23 to 25, for example. If only sealing performance is required, the other part may be cut largely as shown in FIG.

(Function) To explain the function, for example, it is as clearly shown in FIG. 11, namely, at least one side of the opening end of the passage hole (3),
The mouth edge (6) on the right side in the drawing is chamfered in advance to form the mouth edge (6) from a conventional acute-angled convex part to an obtuse-angled convex part in preparation for the subsequent taper process, When the mouth edge (6) is tapered, no cracks occur therein.

(Effects of the Invention) As described above, according to the present invention, it is possible to eliminate the occurrence of cracks that are likely to occur at the edge of the opening end of the passage hole, and the work for this can be done simply by chamfering in advance. It's easy and
It has the effect of being able to obtain excellent products at low cost and with high efficiency.

[Brief explanation of drawings]

Figures 1 to 5 are explanatory diagrams of conventional examples, and Figures 6 to 9
The figure is an explanatory diagram of one example of the method of the present invention, FIG. 10 is a cut side view of FIG. 9, FIG. 11 is an enlarged cross-sectional view taken along the line XI-XI of FIG. 8, and FIG. 12 is an illustration of its use. A side view of one side of the cutter, FIG. 13 is an enlarged sectional view showing a modification of FIG. 11, FIG. 14 is a side view of another example of the cutter used, and FIGS. Explanatory diagram of changes in the take-up part, No. 17
The figure is a cut side view of Figure 15, and Figure 18 is another cutter side view.
A side view of the example, FIGS. 19 and 20 are explanatory diagrams of changes in the chamfered portion obtained, FIG. 21 is a cut side view of FIG. 19,
FIG. 22 is a side view of another example of the cutter, FIGS. 23 and 24 are explanatory diagrams of changes in the chamfered portion obtained, and FIG. 25 is a cut side view of FIG. 23.

Claims (1)

[Claims] A tapered stopper is obtained by subjecting a cylindrical columnar body to a drilling process to form a passage hole opening in the circumferential surface, and then a taper process to form the circumferential surface into a tapered surface, Prior to the tapering process, the opening end of the passage hole is chamfered at least on one side in the circumferential direction, so that the opening edge is formed into an obtuse-angled convex part. Production method.