JPS60220267A - Manufacturing method of sealing member - Google Patents

Abstract

PURPOSE:To simplify the manufacturing process of a sealing member by feeding the cutter almost radially while the work is rotated so that a finished piece which has almost a double ring shape and a concave section configuration in the axial direction may be obtained. CONSTITUTION:A knife-like cutter 13 is set in such a maner that its back 14 is nearly perpendicular to the axis of a cylindrical work 15, and a finished piece 16 is shaped by feeding the cutter in the manner that it takes a concave section configuration in which the angle of the tangent line with respect to the axis is gradually made smaller in the radially outward direction. Because of this, by an arrangement in which one or more finished pieces are retained by a retainer, a sealing member than has alow sliding resistance and a good wear resistance can easily be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a sealing member, and more particularly, to a method for easily manufacturing a sealing member that is made of a fluororesin material, has low sliding resistance, and exhibits strong wear resistance. This article describes possible manufacturing methods.

Various sealing members are manufactured by utilizing the characteristics of fluororesin materials such as mulberry bamboo, heat resistance, abrasion resistance, and low friction properties.

The sealing member shown in FIG.
This is an example of the above-mentioned fluororesin sealing part H disclosed in the above-mentioned publication, which is a truncated conical part 4 made of a fluororesin material and equipped with a flat holding part 2 and a seal lip 3 with a sharp edge. A sealing member 1 having an oval shape in cross section, and a holding member 5 formed by combining an inner ring 6 and an outer ring 7 having an oval-shaped cross-sectional shape around each other, the holding part 2 is held between the holding member 5. The holding member 5 is fitted into the housing 9, and the seal lip 3 is slid on the circumferential surface of the shaft 10 to seal between the housing 9 and the shaft 10.

As shown in Fig. 2, the sealing member having the above-mentioned configuration is manufactured by holding the sealing member material, which has a substantially snake-eye shape turned from a cylindrical material, and is assembled with each other around the circumferential base. The member 5 is held between the inner ring 6 and the outer ring 7 forming the member 5, and a rod-shaped tool 12 is pressed against the member 5 while applying rotational movement to the seal member 1 as shown by the two-dot chain line in the figure. The sealing member is formed by applying bending deformation at a predetermined angle, but turning of a snake-like piece from a round bar or cylindrical member, joining with a holding member, and bending of the sealing part M are also possible. [etc.-[The culm was complicated and the product price could not be avoided.

The present invention discloses a technology that simply incorporates a sealing member that has a structure that is 110 times smaller than the above-mentioned device d, but has an excellent sealing function. be.

The resin material is turned into a rod-like or cylindrical shape to give it an approximately snake-like shape. + ff associated with processing when forming meat parts! ! By utilizing the fact that the thin-walled member is warped in the Q shape due to the friction heat and the inclined surface of the cutting edge of the female-shaped turning tool, the relative rotational movement part (between A and [, L relative reciprocating This prevents the formation of a usable sealing member between the moving members.

The degree of warp deformation caused by turning depends on the wall thickness of the product, the radial width, the rotational speed during turning, the angle of the cutting edge of the female-shaped turning tool, and the feed rate of the turning tool. Since it is affected by speed, etc., it is set appropriately depending on the area where the sealing member is used, its dimensions, etc.

The illustrated embodiment will be described below. FIGS. 3 and 4 show that in the embodiment of the present invention, a female-shaped cutting tool 13 has a back surface 14 and a center axis of a cylindrical material 15. After finishing the inner diameter and outer diameter, the cut piece 16 is set perpendicular to the cutter 13 by feeding the cutter 13 in a direction perpendicular to the center axis of the water seal 15.
is pushed by the surface on the right side of the figure and warps away from the cut surface, and the shape after cutting is completed is such that the angle of the tangent to the central axis is radially outward, as shown on the right side of the figure. In the other embodiment shown in FIG. 4, the cutting tool 13 is set at an angle of inclination to the central axis of the material 15, and cut in the setting direction. The shape of the cut piece is a curved cross section in which the inclination angle of the tangent to the central axis decreases as it goes inward in the radial direction, as shown in the figure.

The sealing member obtained by the above-mentioned embodiment shown in FIG.
As shown in FIG. 5, the sealing member is useful as a backing between the cylinder 20 and piston 21 of an air cylinder device, and the sealing member obtained by the embodiment shown in FIG. It is useful as a gland packing etc. of the piston rod 22, and furthermore, it is useful as a gland packing etc. of the piston rod 22.
The 1 habit between lipstick and () is also useful.

As described above, the manufacturing process of the sealing member of the present invention involves applying rotation to the rod-shaped or cylindrical element 4A made of the fluororesin 4AFl while turning it into a substantially female shape. Due to the structure in which the Rirume J shellfish is fed into JM, each cut piece is heated by the sliding friction heat between the cutting tool and the cut surface during cutting, and is therefore prevented from curving. By using a structure in which a single piece or multiple pieces of cut pieces are held by a holding means, a sealing member with low surrounding resistance and high wear resistance can be easily obtained. The practical effects are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the structure of a sealing member according to the prior art, Fig. 2 is a cross-sectional view showing the same manufacturing method, and Figs. 5-3 and 4 are cross-sectional views showing an embodiment of the present invention. Figure, 5th
The figure is a sectional view showing an example of the use of the sealing member obtained by the embodiment of FIGS. 3 and 4. DESCRIPTION OF SYMBOLS 1... Seal member, 2... Holding part, 3... Seal lip, 4... Frame-shaped part, 5... Holding member, 6... Inner ring, 7... Outer ring , 9...Housing, 10...Shaft, 12...Tool, 1
3... Cutting tool, 14... Back, 15... Sono 4,
16...Cut piece, 20...Cylinder, 21...
・Piston, 22...Piston rod. Utility model registration applicant Japan Oil Seal Kogyo Co., Ltd. 6-2 d;; Figure 3 ↑ Figure 4 5 14'

Claims (1)

[Claims] 1. Applying rotation to the cable material made of fluororesin material, and sending a substantially female-shaped cutting tool approximately in the radial direction into the cable material to form a substantially snake-like shape and curved in the axial direction. A method for manufacturing a sealing member that accepts the cross-sectional shape and obtains a cut piece.