JP3485777B2 - Pressing method of cylindrical body end - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of pressing an end portion of a tubular body. More specifically, the present invention relates to a method of chamfering an inner corner of one end portion of a tubular body made of a metal material, The present invention relates to a method of press working so as to form a smooth surface and a smooth portion near one end.

[0002]

2. Description of the Related Art In the prior art, after a bottomed tubular body material is formed in an upstream process, bottoming is performed through a plurality of chamfering processes, and finally chamfering is performed to remove the end of the tubular body. The processing method of forming was taken.

This conventional processing method is shown in FIG.
As shown in FIG. 5, after the bottomed tubular body material having a predetermined shape is formed in the upstream step, in the first surface pressing step 120, the bottom surface is formed so as to be able to contact the bottom inner surface of the bottomed tubular body material. The pressing punch 125, the surface pressing guide die 122 that guides the bottomed tubular material, and the bottom receiving tool 123 that stands by below hold the bottom surface of the bottomed tubular material and both end surfaces of the body so as to sandwich the surface. Pressing is performed to reduce the surplus of the inner corner of the bottom portion, and one end surface intersecting with a chamfered slope described later is formed flat.

In the next surface pressing step 130, the surface pressing punch 13 whose lower end portion is formed so as to be able to contact the inner surface of the bottom portion of the bottomed cylindrical body.
5, the surface pressing guide die 132 that guides the bottomed cylindrical body, and the bottom receiving tool 133 that waits below to perform surface pressing so as to sandwich both the bottom surface and the body end surface of the bottomed cylindrical body. ,
The flat bottom cylinder is formed by further reducing the surplus of the inner corner of the bottom portion and further flattening one end surface that intersects with a chamfered slope described later.

Next, in the bottom punching step 140, the bottom of the flat-bottomed cylinder is removed by the lowered bottom-punching punch 145, the bottom-punching guide die 142 for guiding the flat-bottomed cylinder, and the bottom-punching tool 143 waiting below. Then, a bottom punching process is performed to form a double-ended open cylindrical body.

In the final chamfering step 150, the chamfering punch 15 is lowered so as to be able to press the upper ends of the both-end opening cylinders.
5 and a chamfering guide die 152 for guiding the cylindrical body with openings at both ends.
And a chamfering tool 153 that stands by below, the chamfering process presses the inner corners of one end of the double-ended opening cylinder to form a chamfered cylinder.

[0007]

According to the prior art method of pressing the end portion of the cylindrical body, the bottom portion is removed, and the chamfering process is performed on the inner corner of the one end before the chamfering step 120, 130 is performed. By reducing the surplus of the inner corner of the bottom portion and forming one end surface that intersects with the chamfered slope into a flat shape, FIG.
It is intended to secure in advance the one-end face diameter difference Df formed on the one end face after chamfering. However,
Since the pressure receiving area of the one end surface that abuts on the bottom receiving tools 123, 133 is large, the surface pressing load per unit area applied to the bottom of the bottomed tubular body is small, and the smooth area of the one end surface is widened. Needs to press both end surfaces of the body with a large pressing force. For this reason, there has been a problem that the shape of the body portion of the bottomed tubular body is easily deformed, and it is difficult to secure a large smooth area on one end face formed after the bottom punching and chamfering.

In order to solve the above problems, the pressing force for pressing the both end surfaces of the bottomed tubular body is reduced to increase the number of times the surface pressing step is repeated a plurality of times. There are problems that the manufacturing cost increases, the processing cost becomes expensive, and the productivity is low.

The present invention has been made in view of the above problems, and an object of the present invention is to reduce the surface pressing step and to make it difficult to deform the shape of the body of the bottomed cylindrical body. In addition, the one end face intersecting with the chamfered slope is made wider so that the inner corner of one end of the cylinder is chamfered, and the one end face is smoothed and the vicinity of the one end is smoothly pressed. It is intended to provide a processing method.

[0010]

In order to achieve the above-mentioned object, a method for pressing an end portion of a cylindrical body according to claim 1 of the present invention is such that a chamfer is formed at an inner corner of one end portion of a cylindrical body formed of a metal material. It is a method of processing and pressing so that one end surface is smooth and the vicinity of one end is smooth, and after the bottomed cylindrical material of a predetermined shape is formed in the upstream process, the next bottom In the punching process, the bottom edge of the bottomed tubular material is brought into contact with the bottom edge of the bottomed tubular material, and the bottom edge of the bottomed punch material is pressed against the bottom edge of the bottomed tubular material to remove the bottom edge of the bottomed tubular material. In the next chamfering step, the inner and outer peripheries of at least one end of the both-end opening cylinder are regulated so that the chamfering conical surface of the chamfering tool is contacted with the inner angle of one end at the chamfering tool. Make contact and press, and make a surface at the inner corner of one end of the double-ended opening cylinder. To form a chamfered cylinder, and in the next crushing step, regulate the inner and outer circumferences of at least one end of the chamfered cylinder so that one end of the crushing tool contacts the crushed surface and Then, one end surface of the chamfered cylinder is crushed to be smooth to form an end portion of the cylinder.

According to the structure of the present invention, since the bottomed cylindrical material is subjected to bottoming to remove the bottom, chamfering, and then crushing, the chamfering step can be omitted. Furthermore, in the crushing step, the pressure receiving area of the one end face that abuts the crushing tool can be reduced, and the crushing process can be performed with a small pressing force when pressing both end faces of the body. Therefore, the shape of the barrel body is not deformed, and the smooth surface of the one end face intersecting the chamfered slope is formed to be wide, and the overall length can be easily determined.

Further, the bottom punching according to claim 2 is a method in which the bottomed cylindrical material formed in the upstream step is pressed after the bottom surface is worked, and the bottomed material having a predetermined shape is formed in the upstream step. After the tubular material is formed, in the next bottom pressing step, at least the inner and outer peripheries of the bottomed tubular material are regulated so that the bottom receiving tool contacts one bottom surface and the bottom other surface. The bottom pressing punch is pressed so as to sandwich at least the vicinity of the inner corner, and the bottom pressing is performed to reduce the surplus at the bottom inner corner of the bottomed cylindrical material to form a flat bottom cylindrical body. To remove the bottom of the cylinder to form a double-ended opening cylinder, and in the next chamfering step, chamfer the inner corner of one end of the double-ended opening cylinder to form a chamfered cylinder. Crush one end of the body to make it smooth And processed, in which so as to form an end portion of the tubular body.

According to the structure of the present invention, the bottom surface is pressed before the bottoming process to reduce the surplus of the inner corner of the bottom of the bottomed cylindrical material. Is easy to form smoothly, and also has the effect of improving the wear resistance of the cutting edges of the bottom punching tool and the bottoming tool. Further, even in a difficult-to-process material such as a stainless steel plate, the bottom can be easily processed.

In the chamfering step according to claim 3, the outer periphery of at least one end of the double-ended cylinder is regulated by a chamfering guide die, and the inner periphery of at least one end is regulated by a tip guide portion of the chamfering tool. Then, the chamfering conical surface of the chamfering tool is brought into contact with the inner corner of one end and pressed to chamfer the inner corner of the one end of the double-ended opening cylindrical body.

According to the structure of the present invention, the inner and outer peripheries of at least one end of the double-ended cylinder are regulated to form the chamfer at the inner corner of the one end, so that a desired chamfered shape can be easily formed. In addition, the chamfering angle does not cause burrs.

Further, in the crushing step according to the fourth aspect, the outer periphery of at least one end of the chamfered cylinder is regulated by the crushing guide die, and the inner periphery of at least one end thereof is crushed and regulated by the tip guide portion of the punch. The one end surface is brought into contact with and pressed against the crushing surface of the crushing tool, and the one end surface of the chamfered cylinder is crushed and smoothed.

According to the structure of the present invention, since the inner and outer circumferences of at least one end portion of the chamfered cylindrical body are regulated and the one end surface is crushed to be smoothed, the chamfering tool is brought into contact with the crushing tool. The pressure receiving area of the end face can be made small, and crushing can be performed with a small pressing force when pressing both end faces of the body. Therefore, the shape of the barrel body is not deformed, and the smooth surface of the one end face intersecting the chamfered slope is formed to be wide, and the overall length can be easily determined. Furthermore, even in difficult-to-process materials such as stainless steel plates, this crushing process can be performed easily.

Further, the bottomed cylindrical body material processed in the upstream step according to claim 5 is a flanged cylindrical body in which a flange is formed in an opening, and a chamfer is formed at an inner corner of one end of the flanged cylindrical body. The processing is performed and the one end surface is crushed.

According to the structure of the present invention, since the bottomed cylindrical body material processed in the upstream process is formed with the flange in the opening, the opening is pressed in the bottom surface pressing, chamfering or crushing. At this time, there is an effect that the opening can be pressed with a large pressing force without being deformed.

Further, the bottomed cylindrical body material processed in the upstream step according to claim 6 is a stepped cylindrical body in which the bottom side cylinder diameter is smaller than the opening side cylinder diameter. The chamfering process is performed on the inner corner of one end of the stepped cylinder, and the crushing process is performed on the one end face.

According to the structure of the present invention, since the bottomed cylindrical body material processed in the upstream process forms the step portion,
The stepped tube body, which is not limited to the straight-line tube body and in which the step portion is likely to buckle, is chamfered to the inner angle at one end, and one end surface is made smooth and the vicinity of the one end is made smooth. Can be pressed.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view showing the structure of the present invention, FIG. 2 is an enlarged view of a bottom pressing step, FIG. 3 is an enlarged view of a bottoming step, FIG. 4 is an enlarged view of a chamfering step, and FIG. 5 is a crushing step. Enlarged views and FIGS. 6 to 8 are cross-sectional views of a workpiece processed in each step.

As shown in FIG. 1, the pressing process of the end portion of the cylinder according to the present invention is performed in the upstream process Or from the metal strip-shaped plate material to the flange part Ra and the step part Rc shown in FIG. 6 (a).
After the work material R of the bottomed tubular body having and is formed, in the next bottom surface pushing step Os, the bottom portion Re of the work material R is
Pressing the bottom surface to reduce the surplus of the inner corner, Fig. 6 (b)
A work S having a flat-bottomed cylindrical body shown in is formed. In the next bottoming-out step Ot, bottoming-out processing for removing the bottom Se of the work S is performed to form a work T having a cylindrical body with open ends as shown in FIG. 7A. In the next chamfering step Ou, the inner edge of the lower end Te of the work T is chamfered to form the work U of the chamfered cylinder shown in FIG. 7B. In the next crushing step Ov, the lower end surface Ug of the work U is crushed so as to smooth the lower end surface Ug and the peripheral edge of the lower end portion Ue, and the cylindrical body shown in FIG. It is composed of a press working process of the end portion of the cylindrical body forming the work V.

In the above-mentioned bottom surface pushing step Os, the die holder 21 is attached to the lower table 1 provided on the upper surface of the press machine (not shown), and the bottom surface pushing guide die 22 and the urethane are arranged in this die holder 21 in order from the top. Elastic spring 2
6 and the bottom receiving tool 23 are vertically regulated and fitted in the die holder 21. As shown in FIG. 2, a large-diameter guide hole 22a into which the outer circumference of the large-diameter body portion Rb of the work material R of the bottomed cylindrical body can be inserted, and a small-diameter cylinder of the work material R are provided on the inner circumference of the bottom surface pushing guide die 22. A small-diameter guide hole 22b into which the outer circumference of the portion Rd can be inserted is bored, and the step portion between them is formed so that the step portion Rc of the work material R does not abut.

Further, the urethane elastic spring 26 made of an elastic material having a spring action has a gap between the outer periphery and the inner periphery of the die holder 21, and the inner periphery is the outer periphery of the body portion 23a of the bottom receiving tool 23. Each of them is formed so that a gap is provided therebetween. In addition, the bottom receiving tool 23 is
The outer periphery of a is formed so that it can be inserted into the small-diameter guide hole 22b of the bottom surface pushing guide die 22, the upper end thereof is formed into a flat surface, and the inner periphery is provided with a guide hole through which a vertically movable knockout 27 can be inserted. ing.

On the other hand, a punch holder 24, which is vertically movable together with the slide, is attached to the upper table 2 provided on the lower surface of the slide (not shown) of the press machine.
A bottom surface pressing punch 25 is integrally attached to the inside of the unit 4. As shown in FIG. 2, the bottom surface pushing punch 25 has a large-diameter guide portion 25a formed below the shank portion, which can be inserted into the large-diameter body portion Rb of the work material R, and below the small-diameter portion of the work material R. Small-diameter guide 25 that can be inserted into the body Rd
b is formed. The lower end of the small-diameter guide portion 25b is formed into a flat surface, and a chamfer with a small radius is formed at the flat edge portion.

Further, the large-diameter guide portion 2 of the bottom surface pushing punch 25
The stripper 28 is inserted through the strip 5a.
8 is moved up and down by a vertical drive means (not shown) in association with the vertical movement of the slide, presses the flange upper surface Rf of the work material R at a position near the lower end, and flange portion Ra.
When the lower surface comes into contact with the upper end surface of the bottom surface pressing guide die 22, the bottom surface pressing guide die 22 urged by the urethane elastic spring 26 is pressed.
The flange portion Ra is sandwiched between the upper end surface of the stripper and the lower end surface of the stripper 28.

Then, in the bottom surface pressing process in the bottom surface pressing step Os thus constructed, the work material R of the bottomed cylindrical body transferred from the upstream step Or is lowered together with the bottom surface pressing punch 25, and near the lower end, the work piece In the material R, the flange upper surface Rf is pressed by the stripper 28 lower end surface,
The lower surface of the bottom Re contacts the upper end surface of the bottom receiving tool 23 that stands by below.

Then, the lower end of the small-diameter guide portion 25b of the bottom surface pressing punch 25 descends while sliding in contact with the surplus portion of the inner angle of the bottom portion Re of the work material R, and when the bottom surface pressing punch 25 reaches the descending end position shown in FIG. The bottom surface of the work piece R is pressed by the flat surface of the upper end of the bottom receiving tool 23 standing by below and the flat surface and the flat edge of the lower end of the bottom surface pressing punch 25 so as to sandwich the vicinity of the bottom Re angle of the work material R, as shown in FIG. As shown in FIG. 5, the bottom Se of the work S having a flat-bottomed cylindrical body with reduced surplus at the inner corner of the bottom is formed. That is, the inner radius r1 and the outer radius r2 of the bottom Se shown in FIG. 6C are reduced with respect to the work material R.

In this bottom surface pressing process, the outer circumference of the small-diameter body portion Rd of the work material R is regulated by the small-diameter guide hole 22b of the bottom surface pressing guide die 22.
By pressing the flange upper surface Rf of the stripper 28 with the stripper 28, the surplus thickness of the inner corner of the bottom portion Re is brought closer to the outer corner of the bottom portion Re and is ironed. Therefore, it is possible to prevent the surplus of the inner angle of the bottom portion Re from being scraped off at the lower end edge of the bottom surface pressing punch 25 and the bottom Se corner thickness of the flat-bottomed cylindrical workpiece S from being thinned.

The flat-bottomed cylindrical workpiece S thus pressed on the bottom surface is pressed upward by the knockout 27 which rises in association with the bottom surface pressing punch 25 and the stripper 28, and is gripped by a finger of a transfer mechanism (not shown). , And work S is fingers and stripper 2
It is separated from the bottom surface pressing punch 25 by the action of 8 and is transferred to the next bottom removal step Ot.

In the next bottoming-out step Ot, the die holder 31 is attached to the lower table 1 provided on the upper surface of the bolster (not shown). Inside the die holder 31, the bottoming-out guide die 32 and the bottoming-out tool 33 are arranged in this order from the top. Are fitted in the die holder 31 while being regulated in the vertical direction. As shown in FIG. 3, a large-diameter guide hole 32a into which the outer circumference of the large-diameter body Sb of the work S of the flat-bottomed cylinder can be inserted, and an outer circumference of the small-diameter body Sd of the work S are provided on the inner circumference of the bottoming guide die 32. And a small-diameter guide hole 32b into which is inserted, and the step portion between them is formed so that the step portion Sc of the work S does not come into contact with it.

In addition, the bottom punching tool 33 has a small-diameter hole 3 having the same inner diameter as the inner diameter of the small-diameter body portion Sd of the work S of the flat-bottomed cylinder on the upper end side.
3a and a large-diameter hole for discharging the scraped-out scrap Ts are drilled below the small-diameter hole 33a. At the inner peripheral angle of the small diameter hole 33a intersecting the upper end surface of the bottom punching tool 33, one cutting edge is formed so that the bottom Se of the work S can be sheared.

On the other hand, a punch holder 34, which is vertically movable together with the slide, is attached to the upper table 2 provided on the lower surface of the slide (not shown) of the press machine.
A bottom punch 35 is integrally attached to the inside of the unit 4. As shown in FIG. 3, the bottom punch 35 has a large-diameter body portion 35a formed below the shank portion, into which a stripper 38, which will be described later, can be inserted, and is inserted below the large-diameter body portion Sb of the work S. A possible medium diameter guide portion 35b is formed,
Below that, a small-diameter guide portion 35c that can be inserted into the small-diameter body portion Sd of the work S is formed. Then, the other cutting edge is formed at the lower end edge of the small-diameter guide portion 35c so that the bottom Se of the work S can be sheared in cooperation with the cutting edge of the bottom punching tool 33.

The large-diameter body portion 35a of the bottom punch 35
The stripper 38 is inserted into the stripper 38
Is configured to be moved up and down by an up / down drive means (not shown) in association with the up / down movement of the slide.

In the bottom punching process in the bottom punching step Ot thus constructed, the work S of the flat-bottomed cylinder transferred from the bottom pushing step Os is lowered together with the bottom punching punch 35, and the bottom surface of the bottom Se is bottomed. The workpiece S reaches the lower end position by contacting the upper end surface of the extraction tool 33. After the work S reaches the lower end position, when the bottom punching punch 35 is further continuously lowered, the bottom Se of the work S has one of the ones formed at the upper end inner circumferential angle of the small diameter hole 33a of the bottom punching tool 33. Bottom cutting is performed by the shearing action of the cutting blade and the other cutting blade formed on the lower end edge portion of the small-diameter guide portion 35c of the bottom punching punch 35, and as shown in FIG. T is formed.

After the work T having the open-ended cylinder is formed, when the bottom punching punch 35 is further continuously lowered,
The scrap Ts separated from the work T is discharged downward, and the bottom punch 35 reaches the descending end position shown in FIG.

The work T of the both-end-opening cylindrical body which has been subjected to the bottom punching in this manner rises together with the bottom punching 35.
The work T is gripped by a finger of a transfer mechanism (not shown), and the work T is separated from the bottom punch 35 by the action of the finger and the stripper 38, and the next chamfering step Ou is performed.
Be transferred to.

In the next chamfering step Ou, the die holder 41 is attached to the lower table 1 provided on the upper surface of the bolster (not shown). Inside the die holder 41, the chamfering guide die 42 and the die liner 46 are arranged in order from the top. The chamfering tool 43 is vertically restrained and fitted in the inside 41, and a chamfering tool 43 is inserted in each inside so as to be vertically movable. As shown in FIG. 4, the chamfering guide die 42 has a large-diameter guide hole 42a into which the outer circumference of the large-diameter body portion Tb of the work T having a double-ended opening can be inserted, and an outer circumference of the small-diameter body portion Td of the work T. And a small-diameter guide hole 42b into which the workpiece T can be inserted are bored, and the stepped portion between them is formed so that the stepped portion Tc of the work T does not abut.

A guide hole 46a is formed in the inner periphery of the die liner 46 so that the outer periphery of the flange 43d of the chamfering tool 43 can be inserted. Further, the chamfering tool 43 can be inserted into the small diameter guide hole 43b of the chamfering guide die 42 below the inner peripheral guide portion 43a which can be inserted into the small diameter body portion Td of the workpiece T having the both-end opening tubular body. Body 43c, a conical surface 43b whose diameter is expanded downward between the lower end of the inner circumference guiding portion 43a and the upper end of the body 43c, and a collar 43d that can be inserted into the inner circumference of the die liner 46 below the body 43c. Are formed. In the chamfering tool 43, the upper surface of the collar portion 43d is pressed by the knockout 47 inserted into the lower die 1 so that the upper surface of the flange portion 43d is chamfered.
2 is moved up to the upper end position where it comes into contact with 2, and the lower surface of the flange portion 43d is moved down to the lower end position where it comes into contact with the lower die 1 by the pressing of a chamfering punch 45 described later.

On the other hand, a punch holder 44, which is vertically movable together with the slide, is attached to the upper table 2 provided on the lower surface of the slide (not shown) of the press machine.
A chamfering punch 45 is integrally attached to the inside of the unit 4. As shown in FIG. 4, the chamfering punch 45 has a large-diameter body portion 45a under which a stripper 48, which will be described later, can be inserted, and a large-diameter body portion Tb of the work T provided below the large-diameter body portion 45a.
A medium-diameter guide portion 45b that can be inserted inside and a small-diameter guide portion 45c that can be inserted into the small-diameter body portion Td of the work T are formed below the large-diameter body portion 45a, and the lower surface of the large-diameter body portion 45a is the flange upper surface Tf of the work T. Is formed so that it can be pressed.

The large-diameter body portion 45a of the chamfering punch 45
The stripper 48 is inserted through the stripper 48,
Is configured to be moved up and down by an up / down drive means (not shown) in association with the up / down movement of the slide.

In the chamfering process in the chamfering process Ou thus constructed, the work T of the double-ended open cylindrical body transferred from the bottom punching process Ot is pressed by the lower surface of the large diameter barrel portion 45a of the chamfering punch 45. Descend, work T
Is guided by the inner peripheral guide portion 43a of the chamfering tool 43, and the lower surface of the lower end Te contacts the conical surface 43b of the chamfering tool 43. When the chamfering punch 45 is further lowered continuously, the inner angle of the lower end Te of the work T is chamfered by the pressing action of the conical surface 43b of the chamfering tool 43 from the lower end surface toward the upper end, and at the lower end position shown in FIG. As shown in FIGS. 7B and 7C, a chamfered slope Uh is formed at the lower inner corner of the work U of the chamfered cylinder.

In this chamfering process, the outer circumference of the small-diameter copper portion Td of the work T is guided by the small-diameter guide hole 42 of the chamfering guide die 42.
b, and the inner circumference of the small-diameter body portion Td of the work T is restricted by the outer circumference of the inner circumference guide portion 43a of the chamfering tool 43, so that the chamfering angle of the work U can be chamfered. .

The chamfered cylindrical workpiece U thus chamfered is chamfered by the chamfering punch 45 and the stripper 4.
8 is pushed upward by a knockout 47 that rises in relation to the workpiece 8, and is gripped by a finger of a transfer mechanism (not shown).
Is removed from the chamfering punch 45 and transferred to the next crushing step Ov.

In the next crushing step Ov, the die holder 51 is attached to the lower stand 1 provided on the upper surface of the bolster (not shown),
In the die holder 51, a crushing guide die 52 and a die liner 56 are fitted in the die holder 51 so as to be regulated in the vertical direction, and the crushing tool 53 is vertically movably inserted in the die holder 51. Has been done. As shown in FIG. 5, a large-diameter guide hole 52a into which the outer circumference of the large-diameter body Ub of the work U of the chamfered cylinder and an outer circumference of the small-diameter body Ud of the work U are inserted into the inner circumference of the crushing guide die 52. A small-diameter guide hole 52b that can be inserted is bored, and the step portion between them is formed so that the step portion Uc of the work U does not abut.

A guide hole 56a is formed in the inner periphery of the die liner 56 so that the outer periphery of the collar portion 53d of the crushing tool 53 can be inserted. The crushing tool 53 has a body portion 53c that can be inserted upward into the small-diameter guide hole 52b of the crushing guide die 52.
And the guide hole 56a of the die liner 56 below the body portion 53c.
53d that can be inserted into the body and the recess 5 on the upper end surface of the body 53c.
A bulging edge portion 53b is formed on the peripheral edge of 3a. The inner periphery of the bulging edge portion 53b is formed so that a small-diameter guide portion 55c of the crushing punch 55 described later can be inserted therein.
The knockout 57 inserted through the lower die 1 pushes the upper surface of the collar portion 53d to the upper end position where it is crushed and abuts the guide die 52, and the crushing punch 55 pushes the collar portion 53d.
The lower surface is lowered to the lower end position where it abuts the lower die 1.

On the other hand, a punch holder 54, which is vertically movable together with the slide, is attached to the upper table 2 provided on the lower surface of the slide (not shown) of the press machine.
A crushing punch 55 is integrally attached to the inside of 4.
As shown in FIG. 5, the crushing punch 55 has a large-diameter body portion 55a into which a stripper 58, which will be described later, can be inserted, and a large-diameter body portion Ub of the work U, which can be inserted into the large-diameter body portion 55a, below the shank portion. A diameter guide portion 55b and a small diameter guide portion 55c that can be inserted into the small diameter body portion Ud of the work U are formed below the large diameter body portion 55a, and a lower surface of the large diameter body portion 55a is a flange upper surface U of the work U.
It is formed so that f can be pressed.

Also, the large-diameter guide portion 55a of the crushing punch 55.
A stripper 58 is inserted through the stripper 58.
Is configured to be moved up and down by an up / down drive means (not shown) in association with the up / down movement of the slide.

Then, the crushing process O configured as described above
In the crushing process in v, the work U of the chamfered cylinder transferred from the chamfering step Ou is the large-diameter body portion 55 of the crushing punch 55.
a The lower surface of the work U is pressed and lowered by the lower surface a, the small-diameter guide portion 55c of the crushing punch 55 is inserted and guided to the inner circumference of the bulging edge portion 53b of the crushing tool 53, and the lower end surface Ug of the work U is crushed by the crushing tool 5
The bulging edge portion 53b of No. 3 abuts on the upper end. Crushing punch 55
Is further lowered, the lower end surface Ug of the work U
Is crushed by the pressing action from the lower end surface to the upper end by the bulging edge portion 53b of the crushing tool 53, and as shown in FIGS. 8 (a) and 8 (b) at the lower end position shown in FIG. The lower end surface Vg of the work V is formed smoothly.

In this crushing process, the outer circumference of the small-diameter body portion Ud of the work U is restricted by the small-diameter guide hole 52b of the crushing guide die 52, and the inner circumference of the small-diameter body portion Ud of the work U is small-diameter guide portion 55c of the crushing punch 55. Since it is regulated by the outer circumference, the work piece V can be crushed so that the wall thickness near the lower end portion Ve does not swell. Further, since the pressure receiving area of the lower end surface Ug of the work U that abuts on the upper end of the bulging edge portion 53b of the crushing tool 53 is small, the surface pressing load per unit area applied to the lower end surface Ug is large, and the pressing force is small. Can be crushed.

Therefore, it is possible to easily increase the lower end face diameter difference Df intersecting the chamfered slope Vh shown in FIG. 8B without deforming the shape of the work, and thus the lower end face Vg.
Has a wide smooth area, and the total length can be easily determined.

The cylindrical work V crushed in this way is pressed upward by the knockout 57 which rises in association with the crushing punch 55 and the stripper 58,
The work V is gripped by a finger of a transfer mechanism (not shown), and is separated from the crushing punch 55 by the action of the finger and the stripper 58, and is transferred to the next downstream process Ow. The flange portion Va of the work V is trimmed in the downstream process Ow, and the work W of the completed cylindrical body shown in FIG. 8C is discharged below the lower table 1.

[0055]

Other Embodiments Another embodiment of the present invention will be described below with reference to FIG. 9 showing the configuration thereof.

As shown in FIG. 9, the press working process of the end portion of the tubular body according to the present example is a work of a bottomed tubular body having the flange portion Ra and the step portion Rc shown in FIG. 6A in the upstream step Or. After the material R has been formed, in the next bottoming step Ot, bottoming processing for removing the bottom Re of the work material R is performed to form a work T having a double-ended opening cylindrical body as shown in FIG. 7A. In the next chamfering step Ou, the inner edge of the lower end Te of the work T is chamfered to form the work U of the chamfered cylinder shown in FIG. 7B. In the next crushing step Ov, the lower end surface Ug of the work U is crushed so as to smooth the lower end surface Ug and the peripheral edge of the lower end portion Ue, and the cylindrical body shown in FIG. It is composed of a press working process of the end portion of the cylindrical body forming the work V.

That is, the structure of the processing step of this example is such that the bottom surface pressing step Os shown in FIG. 1 is omitted, and the bottom punching step Ot, the chamfering step Ou, and the crushing step Ov are the same as in FIG. Since each process has the same configuration as that described, the same components are designated by the same reference numerals and detailed description thereof will be omitted.

In the bottoming process in the bottoming process Ot described above, the work material R of the bottomed cylindrical body transferred from the upstream process Or is lowered together with the bottoming punch 35, and the bottom R thereof.
e The lower surface of the work material R reaches the lower end position by contacting the upper end surface of the bottom punching tool 33. After the work material R reaches the lower end position, when the bottom punching punch 35 is further continuously lowered, the bottom portion Re of the work material R is formed at the upper end inner peripheral angle of the small diameter hole 33a of the bottom cutting tool 33. One cutting edge,
Bottom punching is performed by the shearing action with the other cutting edge formed on the lower edge portion of the small diameter guide portion 35c of the bottom punching punch 35,
As shown in FIG. 7 (a), a work T having a tubular body with open ends is formed.

After the work T having the open-ended cylinder is formed, when the bottom punch 35 is further continuously lowered,
The scrap Ts separated from the work T is discharged downward, and the bottom punch 35 reaches the descending end position shown in FIG.

The work T that has been punched out in this way
Rises together with the bottom punch 35, is gripped by the fingers of the transfer mechanism (not shown), and the work T
Is separated from the bottom punch 35 by the action of the fingers and the stripper 38, and is transferred to the next chamfering step Ou.

In the chamfering process in the next chamfering step Ou, the work T of the both-end opening cylindrical body transferred from the bottom punching step Ot is pressed by the lower surface of the large-diameter body portion 45a of the chamfering punch 45 and descends to make the work T. The lower end Te is inserted and guided by the inner peripheral guide portion 43a of the chamfering tool 43, and the lower surface of the lower end Te contacts the conical surface 43b of the chamfering tool 43. When the chamfering punch 45 is further lowered continuously, the inner angle of the lower end Te of the work T is chamfered by the pressing action of the conical surface 43b of the chamfering tool 43 from the lower end surface toward the upper end, and at the lower end position shown in FIG. 7 (b),
As shown in (c), a chamfered slope Uh is formed at the lower inner corner of the work U of the chamfered cylinder.

In this chamfering process, the outer periphery of the small-diameter copper portion Td of the work T is provided with the small-diameter guide hole 42 of the chamfering guide die 42.
b, and the inner circumference of the small-diameter body portion Td of the work T is restricted by the outer circumference of the inner circumference guide portion 43a of the chamfering tool 43, so that the chamfering angle of the work U can be chamfered. .

The work T chamfered in this way
Is pressed upward by a knockout 47 that moves upward in association with the chamfer punch 45 and the stripper 48, and is gripped by a finger of a transfer mechanism (not shown), and the work U is separated from the chamfer punch 45 by the action of the finger and the stripper 48. Then, it is transferred to the next crushing step Ov.

In the crushing process in the next crushing step Ov, the work U of the chamfering cylinder transferred from the chamfering step Ou is pressed down by the lower surface of the large-diameter body portion 55a of the crushing punch 55, and is guided by the small-diameter guide of the crushing punch 55. The portion 55c is inserted and guided to the inner periphery of the bulging edge portion 53b of the crushing tool 53, and the work U
A lower end surface Ug of the crushing tool 53 contacts the upper end of the bulging edge portion 53b of the crushing tool 53. When the crushing punch 55 is further continuously lowered, the lower end surface Ug of the work U is crushed by the pressing action of the swelling edge portion 53b of the crushing tool 53 from the lower end surface toward the upper end, and the lowering end shown in FIG. 8 (a) at the position
As shown in (b), the lower end surface Vg of the cylindrical work V is formed smoothly.

In this crushing process, the outer circumference of the small-diameter body portion Ud of the work U is restricted by the small-diameter guide hole 52b of the crushing guide die 52, and the inner circumference of the small-diameter body portion Ud of the work U is small-diameter guide portion 55c of the crushing punch 55. Since it is regulated by the outer circumference, the work piece V can be crushed so that the wall thickness near the lower end portion Ve does not swell. Further, since the pressure receiving area of the lower end surface Ug of the work U that abuts on the upper end of the bulging edge portion 53b of the crushing tool 53 is small, the surface pressing load per unit area applied to the lower end surface Ug is large, and the pressing force is small. Can be crushed.

Therefore, the lower end face diameter difference Df intersecting the chamfered slope Vh shown in FIG. 8B can be easily increased without deforming the shape of the work, and thus the lower end face Vg.
Has a wide smooth area, and the total length can be easily determined.

Work V crushed in this way
Is pressed upward by a knockout 57 that moves up in association with the crushing punch 55 and the stripper 58, and is gripped by a finger of a transfer mechanism (not shown), and the work V is separated from the crushing punch 55 by the action of the finger and the stripper 58. Then, it is transferred to the next downstream process Ow. The flange portion Va of the work V is trimmed in the downstream process Ow, and the work W of the completed cylindrical body shown in FIG. 8C is discharged below the lower table 1.

In the crushing step Ov described above, the concave portion 53a of the crushing tool 53 is formed into a convex portion that can be inserted into the inner circumference of the small-diameter body portion Ud of the work U, and the lower end of the small-diameter guide portion 55c of the crushing punch 55 is formed. You may make it not contact | abut to this convex part.

Further, the mold or tool in each of the above-mentioned steps is appropriately provided with an air vent hole (not shown) so as to be able to operate smoothly during processing in each step.

Further, although the above-mentioned work has been described as a work having a flange portion and a step portion, the press working method for the end portion of the cylinder according to the present invention is applied to a work having no flange portion or step portion. I will get it.

[0071]

Since the present invention has been made as described above, it has the following effects.

After the bottomed cylindrical material is formed in the upstream step, the bottomed cylindrical material is removed in the next bottoming step to form a double-ended open cylindrical body, and the next chamfering step is performed. At the inner corner of one end of the double-ended opening cylinder, a chamfering cylinder is formed to form a chamfered cylinder, and in the next crushing step, one end face of the chamfered cylinder is crushed to be smooth to form an end of the cylinder. Since the steps are performed according to the procedure, the surface pressing step can be omitted. Furthermore, in the crushing step, the pressure receiving area of the one end face that abuts the crushing tool can be reduced, and the crushing process can be performed with a small pressing force when pressing both end faces of the body. Therefore, without deforming the shape of the cylindrical body, the smooth surface of the one end surface intersecting with the chamfered slope is formed to be wide, and the total length can be easily determined.

Further, in the bottom punching step, a bottom face pushing step is provided between the upstream step and the bottom punching step, and in this step, the bottom pushing process is performed after the bottom pushing process for reducing the surplus thickness of the bottom inner corner of the bottomed cylindrical body material. Since the punching process is performed, it is easy to form the cut surface smoothly, and the abrasion resistance of the cutting edges of the bottom punching tool and the bottoming tool is improved. Furthermore, even in difficult-to-process materials such as stainless steel plates,
The bottom can be easily punched.

Further, in the chamfering step, the inner and outer circumferences of at least one end of the double-ended cylinder are regulated to form the chamfer at the inner corner of the one end, so that a desired chamfered shape can be easily formed, and The effect that burrs do not occur in the chamfer angle is obtained.

In the crushing step, since the inner and outer circumferences of at least one end portion of the chamfered cylinder are regulated and the one end surface is crushed to be smoothed, the one end surface which is in contact with the crushing tool is crushed. The pressure receiving area can be made small, and it is possible to crush with a small pressing force when pressing both end surfaces of the body. Therefore, without deforming the shape of the cylindrical body, the smooth surface of the one end surface intersecting with the chamfered slope is formed to be wide, and the total length can be easily determined. further,
Even in difficult-to-process materials such as stainless steel plates, this crushing process can be performed easily.

Further, since the bottomed cylindrical body material processed in the upstream process has the flange formed in the opening, when the opening is pressed in the bottom surface pressing process, the chamfering process or the crushing process, the opening part is pressed. There is an effect that it can be pressed with a large pressing force without being deformed.

Further, since the bottomed cylindrical body material processed in the upstream process is formed with the stepped portion, it is not limited to the straight-lined cylindrical body, and the stepped cylindrical body is chamfered at the inner corner at one end. In addition, there is an effect that the press working can be performed so that one end surface is smooth and the vicinity of the one end is smooth.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a configuration of the present invention, which is a cross-sectional view of a central axis line at a processing lower end position in each process.

FIG. 2 is an explanatory view of a bottom surface pushing step, which is an enlarged cross-sectional view of the bottom surface pushing step of FIG. 1;

FIG. 3 is an explanatory view of a bottom punching step, which is an enlarged cross-sectional view of the bottom punching step of FIG. 1.

4A and 4B are explanatory views of the chamfering process, in which FIG. 4A is an enlarged view of the chamfering process of FIG. 1, and FIG. 4B is a sectional view in which the vicinity of one end of the work of FIG.

5A and 5B are explanatory views of the crushing step, in which FIG. 5A is an enlarged view of the crushing step of FIG. 1, and FIG. 5B is a cross-sectional view in which the vicinity of one end of the work of FIG.

6A and 6B show process-by-process shapes of a work processed according to the process sequence of the present invention, where FIG. 6A is a work material processed in an upstream process, FIG. 6B is a work after bottom surface pressing, and FIG. b)
It is sectional drawing which expanded the bottom angle of.

[Fig. 7] Similarly, (a) is a work after bottoming,
(B) is a workpiece after chamfering, (c) is an enlarged cross-sectional view of one end of (b).

[Fig. 8] Similarly, (a) is a work after crushing, (b)
3A is an enlarged view of one end of FIG. 3A, and FIG. 3C is a cross-sectional view after trimming.

FIG. 9 is an explanatory view showing the configuration of another embodiment of the present invention, which is a cross-sectional view of the central axis at the processing lower end position in each step.

FIG. 10 is an explanatory diagram showing a configuration of a conventional technique,
(A) is sectional drawing of the center axis line in the processing lower end position of each process, (b) is an end part enlarged view of the chamfering cylinder after chamfering processing.

[Explanation of symbols]

22 Bottom pushing guide die 23 Bottom receiving tool 25 Bottom pushing punch 32 Guide die for bottom removal 33 Bottom punching tool 33a Small diameter hole 35 Bottom punch 35c Small diameter guide 42 Chamfer guide die 42b Small diameter guide hole 43 Chamfering tool 43a Inner circumference guide 43b conical surface 43c body 45 chamfer punch 45c small diameter guide 52 Smash guide die 52b Small diameter guide hole 53 crushing tool 53a recess 53b Bulging edge 53c body 55 Punching 55c Small diameter guide Df Bottom surface diameter difference Or upstream process Os bottom pressing process Ot bottom removal process Ou chamfering process Ov crushing process Ow downstream process R Bottomed work material S Flat bottom cylinder work Se bottom T Workpiece with open end cylinder Te bottom edge U chamfered cylinder work Ue Lower end Ug bottom surface Uh chamfered slope Work of V cylinder Ve lower end Vg lower end surface Vh chamfered slope Work of W cylinder

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21D 19/00 B21D 19/08 B21D 22/28-22/30 B21D 28/28

Claims (6)

(57) [Claims] 1. A cylinder formed of a metal material is chamfered at an inner corner of one end thereof, and the one end surface is made smooth and
A method of press working so as to smoothly form the vicinity of one end, and after the bottomed cylindrical body material having a predetermined shape is formed in the upstream process, the cutting blade of the bottoming tool is used in the next bottoming process. The bottom side of the bottom cylinder material is brought into contact with the bottom bottom surface of the bottomed cylinder material, and the bottom edge of the bottomed cylinder material is removed to form a double-ended cylinder. Then, in the next chamfering step, the inner and outer peripheries of at least one end portion of the double-ended opening cylinder are regulated so that the chamfering conical surface of the chamfering tool abuts and presses the inner corner of the one-end opening cylinder. A chamfering cylinder is formed by chamfering at one end of the chamfering cylinder, and in the next crushing step, the inner and outer circumferences of at least one end of the chamfering cylinder are regulated so that the crushing surface of the crushing tool abuts the one end surface. And press to crush one end surface of the chamfered cylinder and flatten it. Crushing processing to the press working method of the cylindrical body end, characterized in that so as to form an end portion of the cylindrical body to. 2. The bottom punching is a method in which the bottomed cylindrical body material formed in the upstream step is pressed after the bottom surface is worked, and the bottomed cylindrical body material having a predetermined shape is formed in the upstream step. After that, in the next bottom pressing step, at least the inner and outer peripheries of the bottomed tubular material are regulated so that one bottom surface is brought into contact with the bottom receiving tool, and the other bottom surface is at least near the inner corner. The bottom pressing punch is pressed so as to pinch it, and the bottom pressing is performed to reduce the surplus of the bottom inner corner of the bottomed cylindrical material to form a flat bottomed cylinder, and the bottom of the flat bottomed cylinder is removed in the next bottoming process. Bottom-end processing is performed to form a double-ended opening cylindrical body, and in the next chamfering step, a chamfering processing is performed to the inner corner of one end of the double-sided opening cylindrical body to form a chamfered cylindrical body. Crush to make it smooth Press-forming method of the cylindrical body end according to claim 1, characterized in that so as to form an end. 3. In the chamfering step, a chamfering guide die regulates the outer circumference of at least one end of the double-ended cylinder, and a tip guide portion of the chamfering tool regulates an inner circumference of the chamfering tool. The end portion of the tubular body according to claim 1 or 2, wherein the chamfered conical surface is brought into contact with and pressed by one end inner angle to chamfer the one end inner angle of the double-ended opening tubular body. Stamping method. 4. The crushing step comprises crushing an outer circumference of at least one end of the chamfered cylinder with a crushing guide die, and crushing an inner circumference of at least one end of the chamfered cylinder with a tip guide portion of a punch,
4. The crushing process for bringing one end surface into contact with and pressing the crushing surface of the crushing tool to crush the one end surface of the chamfered cylinder to make it smooth.
The method for pressing the end portion of the cylindrical body according to. 5. The bottomed tubular body material processed in the upstream step is a flanged tubular body in which a flange is formed in an opening, and one end of the flanged tubular body is chamfered and one end face is formed. 5. The method for pressing an end portion of a tubular body according to claim 1, 2, 3 or 4, wherein the crushing process is performed. 6. The bottomed tubular body material processed in the upstream process is a stepped tubular body in which the bottom side body diameter is smaller than the opening side body diameter. The method for pressing an end portion of a tubular body according to claim 1, 2, 3, 4, or 5, wherein chamfering processing is performed on an inner corner of the one end portion and crushing processing is performed on the one end surface.