JPH11197773A - Press die for forming spoon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a circumference edge of a ball part into a stable shape, and to simplify the chamfering, edge-finishing and filling-up works of the edge parts. SOLUTION: In a die 21 comprising a die 22 and a punch 32 to form a ball part of a spoon, a back part forming surface 25 of the curved shape copying a back part of the ball part is formed on a bottom part side of a forming recessed part 24 of the die, a fitting edge 29 to be erected at the prescribed height is formed on a peripheral part 28 of the back part forming surface 25, a body part forming surface 33 of the curved shape copying a body part of the ball part corresponding to the back part forming surface 25 is formed on a tip side of the punch 32, a peripheral part 34 of the body part forming surface 33 is matched with the peripheral part of the die 22, a stepped edge 35 which is directed to the fitting edge of the die 22 and seals the gap between the back part forming surface 25 and the body part forming surface 33 is formed on the peripheral part, a recessed R surface 36 of the prescribed diameter is formed on a corner part between the stepped edge 35 and the body part forming surface 33, and a fitting part 37 to be slidably fitted to the fitting edge of the die 22 is provided on an end part of the stepped edge 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of a spoon for a table, and more particularly to a spoon molding die for molding a ball portion of a spoon.

[0002]

2. Description of the Related Art Conventionally, a manufacturing process of a table spoon of this kind will be described with reference to a process diagram shown in FIG. 6. First, as shown in FIG. A step of removing material from an original plate material W having a predetermined size;
(See FIG. 8), and the ball portion 3 side of the original material 1 is crushed to a predetermined thickness by cold rolling (see FIG. 9). After the cured material 1 is annealed in a non-oxidizing furnace, the outer shape of the ball portion 3 is further punched out by a press to form an intermediate material 4 of the ball portion 3A (half-cutting of the ball portion) (FIG. 1).
0), and the flat surface (the handle portion 2 and the ball portion 3) of the intermediate material 4 is subjected to sisal buff polishing to perform a flat polishing process for removing scratches, pinholes, and the like on the surface. Next, a pattern finishing step (see FIG. 11) is performed in which a pattern is stamped and trimmed on the pattern portion 2 to make the intermediate material 4A of the pattern portion 2A (see FIG. 11), and then the ball portion 3A of the intermediate material 4A is pressed into a predetermined concave shape by pressing. (Ball part forming) step (see FIG. 12), the peripheral edge of the ball part 3A and the deburring / edge sliding step of the handle part 2A, and the peripheral edge of the ball part 3A and the handle part 2A Crushing process, automatic polishing finishing process,
The spoon S is formed by the washing, inspection and packaging steps.

[0003]

However, in the manufacturing process of the conventional spoon S, particularly, the molding of the ball portion 3A is performed by using a die 11 and a punch 12 as shown in FIGS. The die 11 is formed in a trapezoidal shape, and a molding recess 13 having a back molding surface 14 that follows the curved surface of the back 6a of the ball portion 3A of the spoon S at the bottom is formed in the center thereof.
The four peripheral surfaces 15 of the back molding surface 14 are formed as extension surfaces that naturally extend along the back molding surface 14. Further, an abdominal part forming surface 16 for forming an abdominal part 6b corresponding to the back part 6a of the ball part 3A is formed on the tip side of the punch 12,
The four circumferences of the abdomen forming surface 16 are formed with a four-peripheral surface 17 that naturally extends along the abdomen forming surface 16 within a predetermined height range, and a tapered relief surface 18 is formed from the four-peripheral surface 17. The die 11 thus formed is mounted on a die holder, and the punch 12 is mounted on a punch holder. As shown in FIG. 15 (a), the molding recess 13 of the die 11 has a ball portion 3A of an intermediate material 4A. Is placed,
When a predetermined stroke is given to the punch 12 and the ball 3
A is pressed, and the ball portion 3A is formed into a predetermined curved surface. In this case, the ball portion 3A is pressure-formed with a predetermined interval t between the spine forming surface 14 of the die 11 and the belly forming surface 16 of the punch 12 (see FIG. 15B).

However, the punch 12 and the die 11
Is mainly performed by drawing. The outer periphery of the ball portion 3A is formed by the punch abdomen forming surface 16 and the back forming surface 1 of the die 11.
4, and the center bottom is drawn. At this time, as shown in FIG. 15 (b), the upper side of the peripheral edge 3a of the ball portion 3A is in an open state having a gap t, so that the height of the peripheral edge 3a is affected by a change in wall thickness. 16 (a) (b)
(c) As shown in the side view, the edge 3a is formed into a wavy shape with a middle height and the tip side is formed to be lowered, and the edge 3a is punched by a press in a half-cut (ball portion forming) step. Since the state remains as it is, the edge 3a is a cut surface, and as shown in FIG. 16 (c), the end face 3a faces outward and has sharp corners 3b and 3c as shown. For this reason, it is not only extremely troublesome to round the corners 3b and 3c in a curved shape by hand in the subsequent process and flatten the edges 3b and 3c, but also the rounded shape is not uniform, and the ball portion 3 The tip side has an acute angle, is easy to finish thinly, and is considered to have a risk of damaging the lips when using a spoon. This has caused problems in terms of quality and cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to form the periphery of a ball portion into a stable shape, and to perform chamfering and sliding of the edge portion. An object of the present invention is to provide a press die for forming a spoon that can be performed labor-saving, has an appropriate roundness in the periphery, and can be used safely.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional technical problem, the present invention relates to a mold comprising a die for forming a ball portion of a spoon and a punch, wherein a ball is provided on the bottom side of a concave portion of the die. A curved back-shaped molding surface that follows the back of the portion is formed, and a fitting edge that rises at a predetermined height is formed at four circumferential portions of the back-formed surface, and the tip side of the punch is the back-formed surface. A curved abdomen forming surface following the abdomen of the ball portion is formed in correspondence with the above, and the four circumferential portions of the abdominal forming surface are formed in alignment with the four circumferential portions of the die. A step edge for sealing the gap between the back molding surface and the abdomen molding surface is formed, and a concave R surface having a predetermined diameter is formed at a corner between the step difference edge and the abdomen molding surface. At the end of the step edge, a fitting part that slidably fits with the fitting edge of the die A configuration as to spoon molding press die was provided.

[0007]

According to the present invention having the above-described structure, in the step of molding the ball portion under pressure, the flow of the material flows between the back molding surface and the abdomen molding surface toward the step edge, and the same gap is formed. The flow of the material along the back molding surface flowing left and right is blocked at the corner of the back molding surface and the step edge, and the flow of the material along the abdomen molding surface is a concave R formed continuously on the same abdominal molding surface. It flows along the surface toward the back molding surface and the corner of the step edge. For this reason,
A part of the material flowing on the left and right sides flows toward the front end. As a result, the periphery of the curved ball portion is formed into a curved surface following the concave R surface on the inside, and the outer edge is formed into a sharp corner, and the outer shape from the side surface and the tip of the ball portion has a wavy shape with a middle height. In addition, since it is formed on the ball portion where the tip does not drop, in the subsequent process, a chamfered edge that makes a sharp corner outside the periphery be curved.
The corners on the inner side are finely finished by the concave R surface at the time of molding, so one step can be omitted from the conventional process, and the rounding of the tip can be easily performed. As a result, the quality can be prevented from being deteriorated due to the irregularity, so that the spoon can be formed stably.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. In the present invention, the steps from the material removing step to the pattern part finishing step are performed in the same manner as in the related art.
The ball portion 3A is formed by a molding die 21 described below.

This mold 21 is composed of a die 22 and a punch 32 as shown in FIGS. A back forming surface 25 which follows the curved surface of the back portion 6a of the ball portion 3A of the spoon S is formed at the bottom of the forming recess 24 formed on the upper surface side of the trapezoidal main body 23 of the die 22 as in the related art. As shown in FIG. 2, the molding surface 25 has a tip portion 26 for molding the tip 3b side of the ball portion 3A provided at a raised position, and a base portion 27 for molding the neck portion 5 side of the ball portion 3A has a tip portion. At a position lower than the base 26 from the base 26, a line a (corresponding to the periphery 3a of the ball 3A of the spoon S) connecting the front end 26 and the base 27 rises at a predetermined height at a four circumferential portion 28. Punch 3 when pressurized
A fitting edge 29 that slide-fits with the second fitting portion 37 is formed.
Are formed. Further, a concave portion 31 is provided on the base 27 side so that the handle 2A of the spoon S is not deformed.

Further, a curved abdomen forming surface 33 for forming the abdomen 6b of the ball portion 3A of the spoon S is formed on the tip side of the punch 32 in the same manner as in the prior art. A stepped edge 35 is formed at a position corresponding to the four circumferential portions 28 at a slanted edge shown in the figure following the line a, and is formed toward the fitting edge 29 as shown in FIG.
5 and the abdomen forming surface 33 have a concave R
Surface 36 is provided. A fitting portion 37 is formed at a predetermined length at an end of the step edge 35 so as to slidably fit with the fitting edge 29 formed on the die 22.
A tapered portion 38 is formed on the upper side of 7.

When the die 22 and the punch 32 are mold-fitted, the back molding surface 25 and the abdomen molding surface 33 are in a state of being fitted to the fitting edge 37 with the fitting portion 37 and have a thickness equivalent to the thickness of the ball portion 3A. At a predetermined interval t, the four circumferential portions 28 of the back molding surface 25 are aligned with the step edge 35 of the abdomen molding surface 33 along the line a, and the back molding surface 25 and the abdominal molding surface 3 are aligned.
3 is sealed by the step edge 35 (see FIG. 4B).

The die 22 thus formed is mounted on a die holder, and the punch 32 is mounted on a punch holder. And the ball portion 3A of the intermediate material 4A
Is aligned with the forming recess 24 of the die 22, the neck portion 5 is fitted into the fixing recess 31, and the intermediate material 4A is positioned and fixed with the tip of the ball portion 3A pressed against the fitting edge 29.

In this state, when the punch 33 is lowered by a predetermined stroke to press the ball portion 3A, the pressure forming is performed mainly by drawing as in the conventional case, and the peripheral edge 3a side of the ball portion 3A is It is in strong contact with the molding surface 25 and the bottom at the center is drawn. At this time, the flow of the material flows between the back forming surface 25 and the abdomen forming surface 33 toward the step edge 35, and the flow of the material along the back forming surface 25 flowing right and left of the gap t is the same as the back forming surface. 25, and the flow of the material along the abdomen forming surface 33 flows along the concave R-surface 36 continuously formed on the abdomen forming surface 33 and the back forming surface 25 and the step rim 35. Flows towards the corners of. Therefore, a part of the material flowing on the left and right side portions flows toward the front end side 26, thereby forming the curved ball portion 3A.

When the spoon S is modeled by the upward movement of the punch 33, as shown in FIG.
Has a curved surface 39a whose inner surface follows the concave R surface 36.
The outer shape is formed at a sharp corner portion 39b, and the outer shape of the ball portion 3A from the side surface and the tip is shown in FIG.
As shown in (b), a ball portion 3A is formed on the peripheral edge 3a of the ball portion 3A without a swelling shape and a falling end.

In the spoon S taken out, a sharp corner 39b on the outer side of the peripheral edge 3a of the ball portion 3A is chamfered in a curved surface by hand and flattened, and thereafter, is automatically polished and washed.・ Inspection and packaging are performed.

The spoon S thus formed is
In molding the ball portion 3A, a curved back molding surface 25 following the back portion 6a of the ball portion 3A is formed on the bottom side of the molding concave portion 24 of the die 22 of the molding die 21, and four rounds of the back molding surface 25 are formed. A fitting edge 29 that rises at a predetermined height is formed in the portion 28, and a punch 32 of the molding die 21 is formed.
Forms a curved abdomen forming surface 33 corresponding to the abdomen 6b of the ball portion 3A in correspondence with the back forming surface 24, and the four circumferential portions 34 of the abdominal forming surface 33 correspond to the four circumferential portions 28 of the die 22. A step edge 35 is formed at the four circumferential portions 34 to seal the gap t between the back molding surface 25 and the abdomen molding surface 33 toward the fitting edge 29 of the die 22. A concave R surface 36 having a predetermined diameter is formed at the corner between the edge 35 and the abdomen forming surface 33, and the end of the stepped edge 35 is slidably fitted to the fitting edge 29 of the die 22. The configuration is such that a portion 37 is provided.

As described above, the ball 3A formed by the molding die 21 formed as described above is
In the pressure forming process of A, the material flows along the back molding surface 25 between the back molding surface 25 and the abdomen molding surface 33 toward the step edge 35, and flows on the left and right sides of the gap t. Are blocked at the corners of the back molding surface 25 and the stepped edge 35, and the flow of the material along the abdomen molding surface 33 is
3 along the concave R surface 36 continuously formed on the back surface 2
5 and flows toward the corner of the step edge 35. Therefore, a part of the material flowing on the left and right sides flows toward the front end side 26.

Thus, the peripheral edge 3 of the curved ball portion 3A
As shown in FIG. 5C, a is formed on the inside of a curved surface 39a that follows the concave R-surface 36, and on the outside is formed on a sharp corner 39b, as shown in FIG. As shown in FIGS. 5 (a) and 5 (b), the outer shape from the tip is formed on the peripheral edge 3a of the ball portion 3A without undulation and the tip does not fall down. Chamfering to make the sharp corner 39b a curved surface may be performed by flattening and flattening. Also, since the inside is beautifully finished into the curved surface 39a by the concave R surface 36 at the time of molding, the conventional chamfering of the corner 3b is performed. One step of the edge sliding and edge crushing step can be omitted, and the tip 26 can be omitted.
Since the edge on the side is thin, it can be prevented from being sharpened without roundness, and it is possible to improve the safety and prevent the quality from being deteriorated due to the irregular shape, so that the spoon S can be formed stably.

It should be noted that the four circumferential portions 28 of the back molding surface 25 of the die 22 are divided into a front-end tip 26 and a base-lower base 27.
Is formed along the oblique line a connecting the
The present invention is not limited to this, and may be, for example, a horizontal shape.

[Brief description of the drawings]

FIG. 1 is a perspective view of a spoon forming mold.

FIG. 2 is a diagram showing a correspondence between a punch and a cross section of a die.

FIG. 3 is an enlarged cross-sectional view of a circle shown in FIG. 2;

FIGS. 4A and 4B are explanatory diagrams of forming a ball portion by a forming die.

FIG. 5 (a) is a side view of a ball portion formed by a forming die. (b) It is the figure which looked at the ball part shape | molded by the shaping die from the front-end | tip. (c) is a sectional view of the periphery of a ball portion formed by a forming die.

FIG. 6 is a manufacturing process diagram of a conventional spoon.

FIG. 7 is a perspective view of an original plate material.

FIG. 8 is a perspective view of an original material.

FIG. 9 is a perspective view of a ball portion of an original material that has been cold-rolled.

FIG. 10 is a perspective view of the crushed ball portion of the original material punched out.

11 is a perspective view of an intermediate material obtained by stamping a pattern on a pattern portion of the original material of FIG. 10;

FIG. 12 is a perspective view in which a ball portion of an intermediate material is pressure-formed.

FIG. 13 is a perspective view of a conventional spoon molding die.

FIG. 14 is a diagram showing a correspondence between a conventional punch and a cross section of a die.

FIGS. 15 (a) and 15 (b) are explanatory views of forming a ball portion using a conventional forming die.

FIG. 16 (a) is a side view of a ball portion formed by a conventional molding die. (b) It is the figure which looked at the ball part similarly formed with the molding die from the front-end | tip. (c) It is sectional drawing of the periphery of the ball part similarly shape | molded by the molding die.

[Explanation of symbols]

 S Spoon 3A Ball part 6a Back part 6b Abdomen 21 Mold 22 Die 24 Mold concave part 25 Back molding surface 28 Four peripheral parts 29 Fitting edge 32 Punch 33 Abdominal part forming surface 34 Four peripheral parts 35 Step edge 36 Concave R surface 37 Fitting part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tsutomu Oguro 3-21-5, Akiha-cho, Tsubame-shi, Niigata Pref.

Claims (1)

[Claims] 1. A die comprising a die for forming a ball portion of a spoon and a punch, a curved back forming surface following the back of the ball portion is formed on the bottom side of a forming recess of the die. Formed at the four circumferential portions of the surface are fitting edges that rise at a predetermined height, and the tip side of the punch forms a curved abdomen forming surface that follows the abdomen of the ball portion corresponding to the back forming surface. At the same time, the four peripheral parts of the abdominal molding surface are formed in alignment with the four peripheral parts of the die, and the four peripheral parts are directed to the fitting edge of the die and seal the gap between the back molding surface and the abdominal molding surface. A stepped edge is formed, and a concave R surface having a predetermined diameter is formed at a corner between the stepped edge and the abdomen forming surface, and an end of the stepped edge is slidably fitted with a fitting edge of a die. A press die for forming a spoon, characterized in that it has a configuration in which a fitting portion is provided.