JPS6199716A - Shaft with spherical part - Google Patents

Abstract

PURPOSE:To reduce the number of manufacturing processes by shaping a shaft having a spherical part in such a manner that a work is pressed in the spherical form by use of a halved press mold and then having a pipe member at the opposed open ends thereof firmly biting a base shaft. CONSTITUTION:A spherical shell body 3 has a through hole 4 formed through the center thereof and has a hollow and linear base shaft 2 slided therethrough. The spherical shell body 3 has flat faces 5 and 5 formed at the opposed ends thereof in the adjacent positions of the axially open parts. The internal diameter of the rim parts 6 and 6 of the flat faces 5 and 5 is made shorter than the external diameter of the base shaft 2 to form recess parts 7 and 7 around the external face of the base shaft 2. Namely, the rim parts 6 and 6 are firmly retained in the recess parts 7 and 7. A shaft having a spherical part can thus be formed, whereby greatly reducing the number of manufacturing processes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ring having a spherical part, which is suitably used for a change lever, a rearview mirror, etc. of an automobile.

Conventionally, this kind of ring with a spherical part was formed by forging the part corresponding to the spherical part with a machining allowance, and then machining the spherical part, resulting in large material loss (and There was a problem in that the cost was high due to the large number of processing steps.

In order to reduce the above-mentioned material loss and processing man-hours, Japanese Patent Publication No. 53-33309 proposes a connection piece with a through hole that fits the outer circumference of the lever in a proper position in a part of the lever, and a slightly thin cylindrical tongue piece. A spherical part material having a cylindrical tongue piece is fitted and inserted into the through hole, a connecting piece is connected to a part of the lever, and a cylindrical tongue piece is then formed into a spherical shape, thereby forming a spherical part in a part of the lever. A manufacturing method has been proposed.

However, in the above method, it is necessary to provide the tubular ball material with a through hole that fits around the outer periphery of a part of the lever, and a connecting piece that is connected to the front plate by welding or the like to the part of the lever. ,
To manufacture this ball material, forging or sheet metal processing is required, which increases the number of man-hours required to process the ball material. It requires a joining process and is not very effective in reducing the number of processing steps.

The purpose of this invention is to solve the above-mentioned problems of the prior art, and to provide a shaft having a ball portion that requires less machining time and is inexpensive. A cylindrical tube material is inserted and positioned with a gap l1Il, and the tube material is pressed into a spherical shell using a press mold having two spherical parts arranged on both sides of the leap and sun angle to form a spherical shell. To provide a sleeve having a spherical part whose opening ends are narrowed to a diameter smaller than the outer diameter of the base shaft, the base shaft is recessed, and a spherical shell is tightened and fixed to the base shaft.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In FIG. 1, 1 is an embodiment of a ring having a spherical portion according to the present invention, in which a spherical shell 3 is provided at the center of a hollow linear base shaft 2, and a through hole 4 is provided at the center of the base shaft 2. As a result, the axial openings on both sides of the spherical shell body 3 are made into 7 rat surfaces 5, 5, and the inner diameter of the end 6.0 of the flat surface 5.5 is made smaller than the outer diameter of the base shaft 2. , four parts 717 are formed on the outer periphery of the base shaft 2 corresponding to the ends 6, 6, and the ends 6.6 are positioned and fixed in the recesses 7, 7, thus forming a sleeve having a spherical part.

FIGS. 2 to 5 show a method of manufacturing the shaft having a spherical portion shown in FIG. 1. First, as shown in FIG. Next, as shown in the figure, the ball portion 8atI of the base shaft 2 is located at a position facing the holding means 9 attached to the guide 8 so as to be retractable.
A cylindrical tube 10 having a through hole 4 in the center is inserted into the base shaft 2, the holding means 9 is made to protrude from the guide 8, and the outer periphery of the tube 10 is held, temporarily so that the base shaft 2 and the tube 10 are concentric. It's clamped. At this time, there is a gap VA+1 uniform in the ring direction between the inner circumferential surface of the tube material 1 ( ) and the outer circumferential surface of the base shaft 2 . As described above, after arranging the cylindrical tube 10 on the outer periphery of a predetermined position of the base shaft 2, the press molds 12A and 12B, which are divided into two on both sides in the axial direction of the tube 10, are slidably fitted into the guide 8. do. The pair of press molds 12A and 12B have mold cavities 13A and 1 in which spherical portions are formed on the opposing surfaces of the tube material 10I4.
3B, and a base shaft insertion hole 14 in the ring direction in the center.
A and 14B, and the base shaft 2 is slidably fitted into the insertion holes 14A and 14B. The above mold holes +3A and 13B are
Perpendicular flat surfaces ISA and 15B are formed on the small diameter portions in contact with the base shaft insertion holes 14A and 14B, and sloped surfaces 16A and 16B are slightly cut outward in the large diameter portions (bartending portions) to prevent occurrence of paris. is formed. Above mold hole 13
A, length e of 13B.

For C2, the length of the pipe material IO is set to be larger than the sum thereof. (L + e 2 < L) After placing the press molds 12A and 12B, each of which has a spherical portion divided into two as described above, on both sides of the opening side of the tube material 10,! 'f) As shown in Figure 3, pressurize the press molds 12A and 12B and move them within the guide 8 in the direction of bringing them closer together! lJ, both press molds 12A, 1
The opposing inner large diameter portions of 2B are fitted onto both sides of the tube material 10. In this state, the tube material 10 has press molds 12A on both sides.
, 12B, the holding means 9 temporarily clamping the tube material 10 is then moved into the guide 8 to release the clamp by the retainer #19.

When 12B is further moved closer, the tube material 10 is moved into the mold hole 13A,
In FIG. 5, the inner end surfaces of the press molds 12A and 12B abut against each other, forming the spherical shell 3 which is formed by forging along the axial direction of the through hole 4 into a spherical shape with the maximum diameter at the axial center and the smaller diameter at both open sides. In the final step shown, both ends of the tube material IO are pressed into the press mold 1.
A seven-rat surface 5.5 is formed by the seven-rat surfaces 15A and ISB of the flat surfaces 2A and 12B, and the ends 6, 6 (both open ends of the tube material 10) of the flat surface 5.5 concave the outer periphery of the base shaft 2 due to contractile force. It is fixed in a state where it is bitten.

In addition, since the contact surfaces of the press dies 12A and 12B have inclined surfaces 16A and 16B to prevent the occurrence of pars, pars do not occur on the maximum outer diameter portion 3a (barten portion) of the spherical shell 3. If the molds 12A and 12B are not provided with an inclined surface for the above-mentioned burr generation interval, after the two bodies 3 are rested and fixed on the base shaft 2 with a press mold, burr cutting may be performed in the next step. Alternatively, the bartending portion may be formed into a 7-rad surface using a press mold, and the generated burrs may be contained within the bulb, thereby eliminating the burr cutting process.

In addition, in the above embodiment, the 7 rat surfaces are formed on both sides of the opening of the spherical shell 3, but if the flat surfaces 5.5 are not formed, the parts close to both sides of the opening will become a little thinner and , there are wrinkles on the opening end, and the JJ is a little poor, and the JJ is a little f
However, by providing the above-mentioned flat surface 5.5, the thin and thin parts near the flat surface tend to actively follow the desired surface, improving the accuracy of the true sphere and preventing the occurrence of wrinkles on the terminal. This can be prevented and the ability to drink becomes stable. However, it is not always necessary to form both sides of the opening of the spherical shell flat, and depending on the usage conditions of pongee having a spherical part, the spherical shell 3 may be formed as shown in FIG.
Both ends of the opening are shaped along the circular ring, and the terminal 6
In addition, in the embodiments shown in FIGS. 6 and 1, the entire end of the spherical shell is fitted into the recess 7 of the base shaft. If the length of the body is short (the length of the tube in the axial direction), as shown in Figure 7,
A part of the terminal 6'' of the spherical shell 3'' may be fixed to the base shaft 2.In each of the above embodiments, the base shaft is hollow, but as shown in FIG. 8, when the base shaft is a round bar. Since it is difficult to bite the spherical shell into the base shaft and fix it with force, the biting force can be improved by roughening the surface 2'a of the base shaft 2' by applying ceresitan processing or the like.

In the manufacturing shown in FIGS. 2 to 5 described above, the cylindrical tube material 10 is temporarily clamped with the id 9, but the id 9 is eliminated and the press mold 12A is used.

12B may support both sides of the opening of the tube material 10, as shown in FIG. 3, or press dies 12A and 12B may have a fixed force and only move the pressure.

The base shaft 1 having the spherical portion manufactured as described above can be suitably used as a support shaft of an automobile rearview mirror 20, etc., as shown in FIG. 9, and the spherical shell 3 is rotatably fitted into the support hole 20m. By fitting together, the rearview mirror is rotatably supported.

As is clear from the above description, according to the present invention, a cylindrical tube material is arranged at an appropriate position on a linear base shaft, and the tube material is
The spherical part is pressed into a spherical part using a press mold with a 2IItlN shape, and both ends of the opening of the tube are fixed to the base shaft to form a pongee with a spherical part, which reduces the number of processing steps compared to conventional methods.
In addition, since the shape of the tube forming the spherical portion is cylindrical and simple, the cost can be significantly reduced. In addition, in particular, if the tube material is temporarily clamped with a holding means before being forged with a press die, misalignment of the spherical shell with respect to the basic axis can be minimized, and a ring with a highly accurate spherical part can be manufactured. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a yuzu tree having a spherical portion showing an embodiment of the present invention; FIGS. 2, 3, 4 and 5 are sectional views sequentially showing the manufacturing process of the shaft; The figure is a sectional view showing an embodiment of the Sode no Ike according to the present invention, tIS 7 and 8 are also main part sectional views showing the embodiment of the pond of the present invention, and Fig. 9 is an example of the use of the shaft according to the present invention. FIG. 1... Axis, 2... Base axis, 3... Spherical shell, 4...
Through hole, 5...Flat surface, 6...Terminal, 7...
Recessed portion, 8... Id, 9... Holding means, 10...
Pipe material, 12A, 12B...press type.

Claims (1)

[Claims] (1) Consisting of a base shaft and a spherical shell having a through hole in the center through which the base shaft passes, the spherical shell is made by recessing the outer periphery of the base shaft so that both ends of the through hole of the spherical shell have a diameter smaller than the outer diameter of the base shaft. A shaft having a spherical portion, which is fixed to the base shaft.