JPS6229161Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ring material manufacturing device for manufacturing metal rings such as starting ring gears for automobiles.

Conventionally, a device described in Japanese Patent Publication No. 53-46196 has been known as an apparatus for obtaining a metal ring material of good quality. This conventional device includes a cylindrical holding member having an outer diameter smaller than the inner diameter of the ring material to be manufactured, and a cylindrical holding member having a slit extending the entire axial length at one circumferential location, and a cylindrical holding member having an outer diameter smaller than the inner diameter of the ring material to be manufactured. A core metal having a large outer diameter is provided, and by forcibly press-fitting the core metal into the member with a spiral body for a metal ring material fitted to the outer periphery of the holding member, the diameter of the holding member The spiral body is also expanded by expanding the spiral body, and in this state, the spiral body is cut in the axial direction at the slit portion to obtain a plurality of ring-shaped materials with ends.

However, this conventional device had the following drawbacks.

(a) Only one size of ring material can be obtained from one type of unit consisting of a holding member and a core metal, and therefore, the number of units equal to the number of ring sizes to be manufactured is required, which reduces equipment costs. This was extremely uneconomical as it was expensive and required a large space for equipment.

(b) Since the diameter of the holding member is expanded or contracted by elastic deformation of the holding member itself, when the holding member expands, stress is concentrated on the part opposite to the slit, which serves as the fulcrum for the expansion deformation, causing repeated damage. Due to severe fatigue of this part due to use, the life of the holding member is shortened.

(c) Furthermore, as described above, since the holding member utilizes the strain deformation effect with one point as the fulcrum, the holding member is not a perfect circle in the expanded state, but takes on a kind of elliptical shape. In this case, when each of the convoluted bodies forming the helical body moves in the circumferential direction of the member as the holding member expands, the friction is not uniform throughout each convoluted body, and the residual stress in each convoluted body is also uneven. As a result of the uniformity, partial plastic deformation may occur, which may adversely affect the circular accuracy of the finished ring material. In this respect, there is a possibility that this may become a major obstacle in achieving high precision of the ring material, which is the basic purpose of this type of device.

In view of the above-mentioned circumstances, the present invention is a metal ring material that can manufacture ring materials of various sizes with one type of unit, improves the life of the holding member and the circular accuracy of the ring material, and is easy to handle. The purpose is to provide manufacturing equipment for.

The feature of the present invention is that a plurality of planar arc-shaped pieces are arranged on a base at regular intervals in the circumferential direction and movable in the radial direction to form a roughly cylindrical shape whose diameter can be expanded or contracted. A holding member in which a helical body made of a metal wire is fitted around the outer periphery of the holding member, a spring that presses each piece of this holding member inward to apply a shrinking force to the holding member, and an inner flange that prevents each piece from moving inward and holds the holding member at a predetermined diameter; and a flange that engages with a flange provided on the outside of the lower end of each piece to hold each piece upright. The ring-shaped outer flange is attached to the base in a holding state, and a core metal is press-fitted into the holding member, and the core metal has a conical shape that gradually becomes smaller in diameter in the direction of press-fitting into the holding member. The invention resides in an apparatus for manufacturing a metal ring material, in which the inner surface of each piece of a holding member is formed into a tapered shape corresponding to the metal core.

Embodiments of the present invention will be described below with reference to the drawings.

1 is a holding member into which the helical body is fitted, and 2 is a core bar which is press-fitted into the holding member 1.

The holding member 1 includes a plurality of planar arc-shaped pieces 3...
are arranged on the same circumference on the base 4 at regular intervals in the circumferential direction, and each piece 3...
are movable in the radial direction along keys 5 provided radially on the upper surface of the base 4. That is, the holding member 1 is formed into a substantially cylindrical shape by each piece 3, and is configured such that its diameter can be expanded or contracted.

Flange portions 6, 7 are provided on both the inner and outer sides of the lower end of each of the pieces 3. The inner flange 6 is formed into a disc-shaped inner flange 8, and the outer flange 7 is formed into a ring-shaped outer flange 9. are engaged with each other. Both flanges 8 and 9 are bolted to the upper surface of the base 4, respectively. Of these, the inner flange 8 is replaced for each desired ring size, and the outer flange 9
are shared across a range of ring sizes.
A concave hole 10 is provided in the outer flange 7 of each piece 3 along the radial direction, and a compression coil spring 11 is accommodated in the concave hole 10. The outer end of the spring 11 is supported by a spring receiver 12 screwed into the outer flange 9, and each piece 3 is constantly pressed inward by this spring force. That is, the holding member 1
is always applied with a spring force in the direction of contraction.

The inner surface 13 of each piece 3 is formed into a tapered shape in a direction in which the inner diameter of the holding member 1 tapers downward. Note that the outer flange 9 and the base 4 are
Gap 14 between two predetermined adjacent pieces 3, 3
A slit 15 is provided at a position aligned with the slit. Reference numeral 16 denotes a stopper gauge for regulating the press-fitting depth of the core metal 2 into the holding member 1 to a predetermined amount.

As shown in the figure, the core metal 2 is formed into an inverted conical shape with an outer circumferential surface having an inclined surface corresponding to the tapered surface 13 of each piece 3 of the holding member 1. A workpiece holder 17 is integrally attached to the upper part of the core metal 2, and a plurality of presser legs 18 are attached to the lower part of the holder 17 in the circumferential direction with bolts 19 so that the height position can be adjusted freely. There is. 20 is a workpiece support provided on the holding member 1 side corresponding to the presser legs 18, and 21 is a push shaft to which the core bar 2 is attached.

The apparatus configured as described above is used as follows.

At the setting stage, each piece 3 is attached to the spring 11
The outer diameter of the holding member 1 is set to be a predetermined dimension smaller than the inner diameter of the ring to be manufactured, and this outer diameter is maintained by the inner flange 8. Next, a spiral body 22 made of a metal wire is fitted onto the outer periphery of the holding member 1. The spiral body 22 is formed by cold bending a metal wire having a predetermined cross-sectional shape such as a rectangular or circular shape, and its diameter is smaller than the diameter of the ring to be manufactured. Note that the outer diameter of the holding member 1 described above is slightly smaller than the inner diameter of this spiral body 22. Therefore, at this stage, the spiral body 2
2 can be easily fitted into the holding member 1.

Then, as shown in FIG. 5, the core metal 2 is press-fitted into the holding member 1 with the spiral body 22 fitted around the outer periphery. Since the inner surface 13 of each piece 3 constituting the holding member 1 and the outer circumferential surface of the core metal 2 are tapered surfaces corresponding to each other as described above, each piece 3 can be attached to the spring 11 by press-fitting the core metal 2. The outer diameter of the holding member 1 is expanded by moving outward against the force. Therefore, the spiral body 22 receives the expanding force of the holding member 1 and is similarly expanded. When the core metal 2 is press-fitted, the presser legs 18 of the workpiece presser 17 come into pressure contact with the upper end of the spiral body 22, so that the spiral body 22 is pressed downward and its respective convoluted portions are brought into close contact.

With the spiral body 22 expanded in this manner, the spiral body 22 is cut along the axial direction at the gap 14 and the slit 15 of the holding member 1, as shown by the thick line A in FIG. 6, using a suitable cutting tool.

By this cutting, a plurality of ring-shaped raw materials 23 with ends are produced from the spiral body 22. After that, if the core metal 2 is pulled out from the holding member 1, the holding member 1 will be
Each piece 3... is moved inward by the spring 11..., thereby reducing its diameter, and automatically returns to the state before press-fitting the core metal. Therefore, the raw materials 23 can be easily extracted from the holding member 1.

Note that by abutting and welding the cut ends of the ring raw materials 23..., a metal ring material having a desired diameter is manufactured.

The metal ring material manufactured in this way does not have deviations from the circular shape of the ring or differences in the curvature of each part, such as those made by traditional metal wire bending methods or steel pipe ring cutting methods. , it has a high circular accuracy suitable for machining ring gears, etc.

Note that the number of pieces 3 constituting the holding member 1 can be selected as appropriate when implementing the present invention.

When based on the above-mentioned present invention,
Compared to the conventional device described in Publication No. 46196, it has the following superior effects.

(A) By configuring the holding member 1 with a plurality of pieces 3 that are movable in the radial direction, the holding member 1
The diameter can be freely changed within a certain range,
And, the inner surface 13 and core bar 2 of each piece 3...
Since the outer circumferential surfaces of the rings are formed into correspondingly tapered shapes, it is possible to manufacture ring materials of a plurality of sizes using one type of holding member 1 and core bar 2 as a unit. That is, one type of unit can be used in common for manufacturing ring materials in a certain size range. This reduces equipment costs and
This brings about various practical benefits, such as requiring less equipment space.

The holding member 1, which is composed of a plurality of pieces 3, can be expanded or contracted over a fairly wide range by moving each piece 3 in the radial direction. Therefore, if several different sizes of core bars 2 are used for one type of holding member 1, the scope of common use of the holding member 1 itself will be further expanded.

(B) In the conventional device described above, when the holding member expands, stress concentration occurs in the part opposite the slit, which serves as the fulcrum of expansion deformation, and this part suffers severe fatigue due to repeated use, so the life of the holding member is shortened. However, according to the present invention,
An equal force is applied to the holding member 1, that is, each piece 3 constituting the holding member 1,
It acts as a pressing force to move..., and no unreasonable force acts on all the pieces 3..., so the holding member 1 becomes highly durable.

(C) Also, as the holding member 1 as a whole always expands into a perfect circle due to the radial movement of each piece 3... It is possible to solve the problem of circular accuracy of the finished ring material due to the expansion effect, and to ensure perfect circular accuracy.

Further, according to the present invention, each piece 3 is pressed inward by a spring 11 to constantly apply a force in the shrinking direction to the holding member 1, and the shrinkage of the holding member 1 is prevented by the inner flange 8 to prevent the holding member 1 from shrinking. 1
Since the structure is such that the holding member 1 is held at a predetermined outer diameter, the circularity of the holding member 1 can be reliably maintained, and simply and accurately by simply fitting the inner flange 8 into the member 1. The member 1 can be set to a predetermined diametrical state. For this reason, the spiral body 2 relative to the holding member 1
Setting 2 is also easy. In addition, when the core metal is removed, the holding member 1 automatically returns to the state before the core metal was press-fitted, making it easier to remove the ring raw material. Moreover, since each piece 3 can be stably held in an upright state by the flange 7 of the piece 3 and the outer flange 9 engaged therewith, the radial movement of each piece 3, that is, the holding member The expansion and contraction movement of step 1 can be performed smoothly and stably, making handling easier.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the holding member and its support structure, Fig. 2 is a plan view of the same,
Fig. 3 is a front view of the core metal, Fig. 4 is a plan view of the same, and Fig. 5 is a front view of the core metal.
The figure is a schematic sectional view of the core metal in a press-fitted state, and FIG. 6 is a schematic front view of the core metal removed. DESCRIPTION OF SYMBOLS 1... Holding member, 2... Core metal, 3... A plurality of pieces constituting the holding member, 4... Base that supports the same piece, 7... Flange of the same piece, 9... Outer flange, 8 ...Inner flange, 11...Spring,
13...Tapered inner surface of each piece, 22... Spiral body.

Claims (1)

[Scope of utility model registration request] A plurality of planar arc-shaped pieces are placed on a base at regular intervals in the circumferential direction and movable in the radial direction, so that the outer periphery is formed into a roughly cylindrical shape whose diameter can be expanded or contracted. a holding member into which a spiral body is fitted, a spring that presses each piece of this holding member inward to apply a shrinking force to the holding member, and movement of each piece inwardly against this spring. and an inner flange that holds the holding member at a predetermined diametrical state by preventing The inner surface of each piece of the holding member is provided with a ring-shaped outer flange and a core metal that is press-fitted into the holding member, and the core metal has a conical shape that gradually becomes smaller in diameter in the direction of press-fitting into the holding member. An apparatus for manufacturing a metal ring material, characterized in that the metal ring material is formed into a tapered shape corresponding to the core metal.