JPH09122786A - Formation of cut-bent shaped part of joint component of endoscope curved tube and joint parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming method of cut-bent shaped part of a curve tube joint component without damaging or cutting an operating wire inserted into the inside of the cut-bent shaped part of an endoscope curve tube and with the high reliability and to provide a joint component. SOLUTION: A joint component 1 formed with a slit 2 is mounted on a positioning member 3. On the upper side of the joint component 1, a joint component 4 with the shape as same as the positioning member 3 is supported oppositely to be freely moved vertically. Further, a punch 5 and a punch 7 are arranged mutually oppositely to be freely advanced and retracted on the side faces of the joint component 1. On each top end of the punch 5 and the punch 7, projecting parts 6 and 8 along the cut-bent shaped part of the required joint component 1 are formed as one body. Further, a lower die is fitted to the positioning member 3 and an upper die is fitted to the positioning member 4 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a cut / bent shaped portion on the inner peripheral surface side of a curved tube capsule part for an endoscope and a capsule part.

[0002]

2. Description of the Related Art Conventionally, there is an invention described in Japanese Utility Model Publication No. 2-39617, for example, as a device for forming a cut-and-bent shape portion on the inner peripheral surface side of a curved tube capsule part for an endoscope. In the above invention, as shown in FIG. 9, first, the two middle dies 12, 12 parallel to the pipe A are inserted, and the tip of the pipe A is pressed against the contact plate 20 to position the pipe A.
Next, the two opposing punches 13 approach the pipe A, respectively. Along with this, the core metal 18 has two medium-sized molds 12, 1.
The wedge portion 14 that enters between the two and has a tapered shape of the cored bar 18
And the tapered surface 15 of the middle die 12 spread the middle die 12, and the surface of the middle die 12 having the receiving hole 17 contacts the inner peripheral wall of the pipe A.

At the same time, each of the two punches 13 abuts on the outer peripheral wall corresponding to the receiving hole 17 of the middle die 12, and the pipe A
Press the outer peripheral wall of. Then, the protrusion 16 of the punch 13 and the receiving hole 17 perform dowel forming. After the dowel forming, the two punches 13 move away from each other, and the cored bar 18 also comes out of the space between the two middle dies 12, 12.
The springs 19 bring the tips closer to each other and the receiving hole 17 is separated from the dowel. Then, the pipe A is pulled out from the two middle molds 12, 12.

[0004]

However, the above-mentioned prior art has the following drawbacks. That is,
The above-mentioned conventional technique is a method in which cutting and bending are performed simultaneously. At this cutting step, as shown in FIGS. 10 and 11, since the outer periphery of the pipe A is not pressed by the wrinkle presser, the pipe material is pulled toward the center of the pipe A and the pipe A is deformed in the radial direction. 33. Deformation 33
Then, the cut and bent shape portion 34 through which the scanning wire is inserted
It becomes impossible to keep the bending depth of the constant.

Further, as shown in FIG. 12, when the pipe A is dowel-molded, a burr 21 is generated. When the burr 21 is generated, as shown in FIGS. 13 and 14, the operation wire 23 that is inserted into the cut-and-bent portion 22 is caught, which may make the operation difficult. For this reason,
The burr 21 must be manually passed through the reamer, and burrs generated during the reamer must be removed by barreling. Therefore, if the above steps are taken, it is impossible to improve the number of products produced and the yield rate.

Besides, when molding a hard material such as stainless steel, a large pressure is required for cutting. Further, it is necessary to maintain the clearance between the die and the punch with high accuracy for cutting. Further, the punches and the protrusions and the die wear quickly, which makes it difficult to obtain a product having stable dimensions.

According to the first to third aspects of the present invention, when the cut and bent shape portion is formed on the Kancetsu component, the burr is not generated in the cut and bent shape portion without deforming the radial direction of the Kancetsu component. The present invention provides a method for forming a cut / bent shape portion of a curved tube cansetsu part for an endoscope and a cansetsu part.

[0008]

According to a first aspect of the present invention, there is provided a method for forming a cut and bent shape portion on an inner peripheral surface side of a Kansetsu component of a bending tube for an endoscope, wherein two slits are formed in the outer peripheral direction in advance. After the forming step, a die having a diameter smaller than the inner diameter of the capsule component is fitted inside the capsule component, and a punch having a protrusion arranged near the outer periphery is used to form a gap between the two slits of the capsule component. The method for forming a cut-and-bent shape portion of an endoscope curved tube capsule part is characterized in that it comprises a step of pressing and bending.

According to a second aspect of the present invention, there is provided a method for forming a cut-and-bent shape portion of a curved tube lance part for an endoscope according to the first aspect, wherein at least a protrusion of the punch is an elastic member.

According to a third aspect of the present invention, there is provided a slit component having a cut and bent shape portion on the inner peripheral surface side of the capsule component of the bending tube for an endoscope, in which two slits are formed on the outer periphery and the two slits are formed. A curved tube capsule part for an endoscope, characterized in that a slit-bent shape portion is formed by pushing a space between slits to the inside of the capsule part.

In the first and third aspects of the invention, the first step of forming the two slits in the Kansetsu component is performed by wire electric discharge machining or electrolytic cutting in which burrs do not occur.
Alternatively, laser processing, press processing, metal saw, band saw, etc., which generate burrs are performed, and barrel processing is performed when deburring is required later.

In the second step of performing the bending step, a punch presses and bends between the two slits already processed in the first step. At this time, the cut and bent shape portion is not deformed in the radial direction. This is because it is possible to perform molding with a far weaker force than when performing cutting and bending at the same time. Also, no burr is generated inside the cut and bent portion. Further, since the cut and bent portion can be formed with a low pressure, abrasion of the punch can be suppressed.

According to the second aspect of the present invention, at least the protruding portion is pressed and bent by the punch made of an elastic member, and the cut and bent shape portion is secured by the die. That is, since the bending work can be performed with a weak force, the punch is deformed so as to follow the shape of the die, and a desired cut and bent shape portion can be obtained.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 1 to 7 show the present embodiment, FIG. 1 is a schematic configuration diagram, FIG. 2 is a perspective view of a positioning member and a die,
3 is a perspective view of the Kansetsu component, FIG. 4 is a side view of the same, FIG. 5 is a sectional view taken along the line AA ′ of FIG. 4, FIG. 6 is a sectional view at the time of molding, and FIG.
[Fig. 4] is a layout view of a cansetsu component and a punch.

As shown in FIG. 1, a cansetsu component 1 having slits 2 is placed on a positioning member 3 which is machined into a shape corresponding to the shape of the ear portion R of the cansetsu component 1. Above the cassette part 1, a cassette part 4 having the same shape as the positioning member 3 is supported so as to be vertically movable. Further, a punch 5 and a punch 7 are provided opposite to each other on the side surface of the cansetsu component 1, and the punch 5 and the punch 7 are arranged so as to be retractable by a cylinder (not shown) with respect to the center of the diameter of the cansetsu component 1, respectively. Has been done.

Protrusions 6 and 8 are formed integrally with the tips of the punch 5 and the punch 7, respectively, following the cut and bent shape portion of the desired Kansetsu component 1. The projections 6 and 8 have a slit 2 formed with two slits 1
It is arranged so as to face the position where the bending is performed. Metal or hard plastic can be used as the material of the punches 5 and 7, and in the present embodiment, metal is used as the material. Further, as shown in FIG. 2, the positioning member 3 is fitted with a lower die 10 for bending, and the positioning member 4 is fitted with an upper die 9 for bending.

The operation of this embodiment will be described below. In the first step of forming the slit 2 in the Kansetsu component 1 in advance, as shown in FIGS. 3 to 5, the slit 2 is formed by wire electric discharge machining or electrolytic cutting. Or laser processing,
Slit 2 by pressing, metal saw, band saw, etc.
To form Burrs are generated when processed by laser processing, press processing, metal saw, band saw, etc., but these burrs are removed by barrel processing. In this case, a deburring process is required, but the deburring process can be performed in a batch process as compared with the conventional method in which a reamer is passed after cutting and bending, so that the desired Kansetsu parts can be obtained with much higher efficiency. Is possible.

Next, the second step of bending between the two slits 2 formed in the Kansetsu component 1 will be described with reference to FIG. First, the Kansetsu component 1 is placed on the positioning member 3 with which the lower die 10 is fitted. Next, the positioning member 4 and the upper die 9 descend from the upper side, and the positioning member 4 clamps the cansetsu component 1. At this time, the upper die 9 contacts the lower die 10 to form a die for bending.

Next, the punches 5 and 7 are attached to the cansetsu component 1.
A cylinder (not shown) moves from the outer circumference to the center. By this movement, the protrusions 6 and 8 of the punches 5 and 7 press between the two slits 2 of the Kansetsu component 1 to perform bending. At the time of bending, the upper die 9 and the lower die 10 secure a cut and bent shape portion. When the bending is completed, the punches 5 and 7 are retracted, and the positioning member 4 and the upper die 9 are also raised and retracted. Then, the molded cansetsu component 1 is taken out. At the time of the above-described bending, as shown in FIG. 7, the push-bending position of the protrusions 6 and 8 of the punches 5 and 7 is an intermediate position of the cutting width of the slit 2.

According to the present embodiment, by forming two slits in the Kansetsu component in advance and bending between the slits, the radial direction of the bent portion is not deformed.
Also, burrs do not occur inside the cut and bent portion. Further, since the cut and bent shape portion can be formed with a low pressure, wear of the die can be suppressed. Further, in the endoscope bending tube, by preventing the operation wire inserted through the inside of the cut-and-bent shape portion from being caught, it is easy to operate, and a method of forming the cut-and-bent shape portion of a highly reliable curved tube cansetsu component and It is possible to provide Kansetsu parts.

(Second Embodiment) FIG. 8 is a perspective view of a punch and an elastic member according to the present embodiment. The present embodiment is different in that the projections 6 and 8 at the tips of the punches 5 and 7 in the first embodiment are eliminated, and instead an elastic member 11 is provided in the shape of the projection, and other configurations are the same. The description is omitted. The elastic member 11 is not particularly limited as long as it is a material having elasticity such as urethane rubber, isoprene rubber, butyl rubber, natural rubber, and silicon rubber.

The operation of this embodiment will be described below. Similar to the first embodiment, the punches 5 and 7 move toward the center of the Kansetsu part. Then, the elastic member 11
Bends by pressing between two slits. At this time, the elastic member 11 is deformed so as to follow the shape of the die, and a desired cut and bent shape portion can be obtained. Other operations are the same as those in the first embodiment, and the description thereof will be omitted.

According to the present embodiment, the first embodiment
The same effect can be obtained. Further, bending the elastic member can reduce wear of the protrusion and reduce equipment cost of the protrusion die, which is a consumable item. Further, the shape of the elastic member does not need to be precise, and the elastic member can be easily manufactured.

Although the punches 5 and 7 and the elastic member 11 are separate bodies in the present embodiment, the present invention is not limited to this, and the punches 5 and 7 and the elastic member 11 are integrated. May be.

[0025]

According to the effects of claims 1 to 3, by forming two slits in the Kansetsu part in advance and bending between the two slits, the radial direction of the Kansetsu part is not deformed. . Also, no burr is generated inside the cut and bent portion. Further, wear of the punch can be suppressed. Further, in the bending tube for an endoscope,
By preventing the operation wire inserted through the inside of the cut / bent shape portion from being caught, it is possible to provide a method for forming the cut / bent shape portion of the curved tube / set part which is easy to operate and has high reliability, and a kansetsu part.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment.

FIG. 2 is a perspective view showing the first embodiment.

FIG. 3 is a perspective view showing the first embodiment.

FIG. 4 is a side view showing the first embodiment.

FIG. 5 is a sectional view taken along line A-A ′ of FIG. 4;

FIG. 6 is a cross-sectional view showing the first embodiment.

FIG. 7 is a layout view showing the first embodiment.

FIG. 8 is a perspective view showing a second embodiment.

FIG. 9 is a perspective view showing a conventional form.

FIG. 10 is a cross-sectional view showing a conventional form.

11 is a sectional view taken along line B-B 'of FIG.

FIG. 12 is a cross-sectional view showing a conventional form.

FIG. 13 is a side view showing a conventional form.

FIG. 14 is a front view showing a conventional form.

[Explanation of symbols]

 1 Kansetsu parts 2 Slits 3,4 Positioning members 5,7 Punches 6,8 Projections 9 Upper die 10 Lower die 11 Elastic member

Claims (3)

[Claims] 1. A method of forming a cut and bent shape portion on the inner peripheral surface side of a capsule part of an endoscope bending tube, wherein a step of forming two slits in the outer peripheral direction in advance, and a step of forming the capsule part after the step. A die having a diameter smaller than the inner diameter is fitted inside the kansetsu part, and a punch having a protrusion arranged near the outer periphery is used to press and form between two slits of the kansetsu part. A method for forming a cut-and-bent shape portion of a curved tube set for endoscopes, which is a feature. 2. The method for forming a cut-and-bent shape portion of an endoscope curved tube capsule part according to claim 1, wherein at least a projection of the punch is an elastic member. 3. A Kansetsu part having a cut and bent shape portion on the inner peripheral surface side of the Kansetsu part of a bending tube for an endoscope,
A curved tube cansetsu part for an endoscope, characterized in that two slits are formed on the outer circumference and a space between the two slits is pressed and bent to the inside of the cansetsu part to form a cut and bent shape part.