JPH0683859B2 - Method for manufacturing edge ring with flat surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention has a flat surface intended to be fitted and fixed to a glass lid edge or a lid edge of a enamel device and a container rim. The present invention relates to a method for manufacturing an edge ring.

(Prior Art) Conventionally, the inventor of the present application has made various improvements in this kind of method for manufacturing an edge ring, and invented a method of press molding from a metal tape (Japanese Examined Patent Publication No. 52-1388), According to the application, a method for manufacturing an edge ring which can be elastically deformed when mounted is also invented (Japanese Patent Laid-Open No. 162154/1985).

(Problems to be solved by the invention) According to the conventional manufacturing method, the side wall is formed in a vertical straight line (flat).
However, it is not solved to perform the process of bending the upper and lower edges in one step with one set mold. For example, according to JP-A-60-162541,
Two molds are used, and a winding piece is used to bend when the edge ring is fitted.

Therefore, there has been a problem that a method of providing a relatively wide straight portion of the side wall has not been solved and that both upper and lower edges cannot be processed in one step.

(Means for Solving the Problem) However, according to the present invention, when the short tubular ring is bent by the female mold and the male mold, the inner wall of the ring or the outer supporting member is processed by the female mold and the male mold. It solved the conventional problem.

That is, the present invention, a metal tape having a width required for the edge ring is cut into a predetermined length, and a short tubular ring is formed by welding both ends thereof, and the short tubular ring is formed into a press die,
Set it in a state of supporting the side wall, then descend the male mold while supporting the side wall, and the section-shaped arc processed portion of the male mold,
The upper edge of the ring is curved in an arcuate shape in cross section in cooperation with the ridge of the female die that freely descends, and the lower edge is curved by the female annular groove to the same side as the curved side of the upper edge. A method of manufacturing an edge ring having a featured flat surface. In the above, the upper edge and the lower edge of the short tubular ring are curved outward or inward. This curve is processed by an annular groove having an arc-shaped cross section provided in the corresponding portion of the female type and the male type. In this case, since the side wall of the ring is supported by the auxiliary type (female type) or the like, the side wall of the product is kept almost vertical, so that the purpose can be achieved. Since the side wall support mentioned above is a female side wall having a vertical wall, there is no risk of deformation during pressing.

(Operation) According to the present invention, when the ring formed in the shape of a short cylinder is pressed by the female die and the male die, since the upper and lower edges thereof are in contact with the annular grooves of the both die, they are curved in the same direction, The outer or inner wall of the ring is supported so that it does not deform during processing and the flat ring retains its original shape as originally supplied.

(Embodiment 1) Next, an embodiment of the present invention will be described with reference to FIGS.

A short tubular ring 2 is formed by welding both ends of a tape material 1 obtained by cutting a stainless tape into a predetermined length,
If necessary, after polishing the inner and outer walls of the welded part to make them flush (if the welding condition is good, it is not necessary to polish them), and then fit the inside of the first female die 3 (Fig. 3), The lower edge is brought into contact with the edge of the annular groove 5 having the arcuate cross section of the second female die 4. Then male type 6
When it is lowered as indicated by arrow 7, the upper edge of the ring 2 is curved along an annular groove 8 having an arcuate cross section provided on the lower surface of the male die 6. The lower edge of the ring 2, however, is curved inwardly by the annular groove 5. In this way, the upper edge of the ring 2 completes the curved edge 2a having a predetermined curvature by the protrusion 10 of the third female die 9, and at the same time the curved edge 2b is completed at the lower edge of the ring 2 and the straight side wall 2c ( Predetermined edge ring with flat surface)
11 is completed.

In the above embodiment, the upper and lower edges of the ring 2 are curved inwardly. According to the above method, the upper and lower edges of the ring 2 can be simultaneously curvedly formed by a female mold and a male mold in one step, and the side wall of the central portion can be formed relatively wide and without deformation. In this case, the first female mold 3
Is pressed down by the spring 13 as the male die 6 descends, and
Thus, the linearity of the side wall is maintained. Further, since the third female die 9 also lowers the spring 14 as the male die 6 descends and descends as shown by the arrow 15, the upper curved edge 2a of the product edge ring 11 can be finished in a predetermined shape and size. it can.

(Embodiment 2) Next, an embodiment of the present invention will be described with reference to FIG. 1, FIG. 2 and FIG.
7 and 8 will be described.

A short tubular ring 2 is formed by welding both ends of a tape material 1 obtained by cutting a stainless tape into a predetermined length.
If necessary, after the inner and outer walls of the welded portion are ground to be flush with each other (it does not necessarily have to be polished if the welding condition is good), then the lower edge inner side is fitted to the outer side of the first female die 16 and , Its lower end is faced with an annular groove 17 having an arcuate cross section provided on the side wall portion of the first female die 16. Then, when the male die 18 is lowered as shown by the arrow 19, the upper end of the ring 2 faces the inside of the annular groove 20 having an arcuate cross section of the male die 18 (FIG. 6). Then, when the male die 18 is further lowered, the upper edge of the ring 2 is curved by the annular groove 20.
And the lower edge forms the curved edge 2b by the annular groove 17. In the above, the curvature of the curved edge 2a is corrected by coming into contact with the protrusion 22 of the second female die 21. The second female mold 21
Is pressed down by the spring 23 as the male die 18 descends.
As described above, the curved edge 2a is not excessively deformed, and the straight side wall 2c between the curved edges 2a and 2b is also not deformed and is formed into a correct shape. In the above embodiment, the upper and lower edges of the ring are curved outward.

(Effect of the Invention) According to the present invention, the upper and lower edges of the ring are curved by the female die and the male die, the side wall of the ring is supported by the female die during press working, and part of the female die is freely moved. There is an effect that a ring having a straight side wall (flat surface) of a predetermined width can be formed with high accuracy.

That is, the edge ring having a desired cross-sectional shape can be obtained in one step.

[Brief description of drawings]

FIG. 1 is a perspective view in which a part of a tape material used for implementing the present invention is omitted, FIG. 2 is a perspective view of the same ring, FIG. 3 is an enlarged sectional view of the same die, and FIG. 4 is a press of the same die. FIG. 5 is a partially enlarged perspective view of the product, FIG. 6 is an enlarged sectional view of the mold of another embodiment, and FIG. 7 is an enlarged sectional view of the mold when the die is pressed. FIG. 8 is a partially enlarged perspective view of the same product. 1 ... tape material, 2 ... ring 3 ... first female type, 4 ... second female type 6 ... male type, 9 ... third female type 11 ... edge ring, 16 ... first female type Mold 18 …… Male, 21 …… Second female

Claims (3)

[Claims] 1. A short tubular ring is formed by cutting a metal tape having a width required for an edge ring into a predetermined length and welding both ends thereof, and the short tubular ring is formed into a press die. Set while supporting the side wall, then lower the male mold while supporting the side wall, and work the upper edge of the ring by cooperation of the male arc-shaped cross-section processed portion and the female ridge that freely descends. A method for manufacturing an edge ring having a flat surface, characterized in that the edge is curved in an arc shape and the lower edge is curved to the same side as the curved side of the upper edge by a female annular groove. 2. A method of manufacturing an edge ring having a flat surface according to claim 1, wherein the upper edge is curved in the outer or inner direction. 3. The method for manufacturing an edge ring having a flat surface according to claim 1, wherein the side wall supporting portion is lowered along with the lowering of the male die.