JPH11156449A - Method for press-working cylinder end part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To chamfer one end part inner edge of a cylinder formed from a metal stock and to smoothen the periphery of the one end part. SOLUTION: After a bottomed cylindrical work stock R is formed in an upstream process Or, in a next bottom face press process Os, a flat bottomed cylindrical work S is formed by bottom face pressing for reducing an excess material at a bottom inner edge of the work stock R, in a next bottom removing process Ot, a cylindrical work T with opening both ends is formed by bottom removing to remove a bottom part of the work S, in a next chamfering process, a chamfered cylindrical work U is formed by chamfering an end part inner edge of the work T, in a next squeezing process, an end face of the work U is squeezed to smooth an end face crossing to a chamfered inclined face, further, a press working process to form a cylindrical work V with smoothening the peripheral edge of an end part is constituted.

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 cylindrical body, and more particularly, to a method of chamfering an inner corner of one end of a cylindrical body formed of a metal material and further forming one end surface. And press forming so as to smoothly form the vicinity of one end.

[0002]

2. Description of the Related Art In the prior art, after a bottomed cylindrical body material is formed in an upstream process, a bottom punching process is performed through a plurality of face pressing processes, and finally a chamfering process is performed to cut off the end of the cylindrical body. The processing method of forming was used.

FIG. 10A shows a conventional processing method.
As shown in the figure, after the bottomed cylindrical body material having a predetermined shape is formed in the upstream process, in the first surface pushing step 120, the lower end portion is formed so as to be able to contact the bottom inner surface of the bottomed cylindrical body material. A pushing punch 125, a face pushing guide die 122 for guiding a bottomed cylindrical body material, and a bottom receiving tool 123 waiting on the lower side face the bottom surface of the bottomed cylindrical body material so as to sandwich both body bottom end surfaces. Pressing is performed to reduce the excess thickness at the inner corner of the bottom, and one end face that intersects a chamfered slope described later is formed flat.

[0004] In the next face-pressing step 130, the face-pressing punch 13 whose lower end is formed so as to be in contact with the bottom inner surface of the bottomed cylindrical body.
5, a surface pushing guide die 132 that guides the bottomed cylindrical body, and a bottom receiving tool 133 that stands by below, so that the bottomed cylindrical body is face-pressed so as to sandwich both the bottom surface and the body end surfaces. ,
A flat bottom cylindrical body is formed by further reducing the extra thickness at the bottom inner corner and further flattening one end face intersecting a chamfered slope described later.

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

In the final chamfering step 150, the chamfering punch 15 is lowered so as to press the upper end of the cylindrical body having both ends open.
5, and a chamfering guide die 152 for guiding the both-end opening cylindrical body.
And a chamfering tool 153 which stands by below and chamfers an inner corner of one end of the open-ended cylindrical body so as to form a chamfered cylindrical body.

[0007]

According to the prior art method of pressing the end of the cylindrical body, the bottom is removed and the bottomed cylindrical body is subjected to face pressing steps 120 and 130 before chamfering the inner corner at one end. 10 (b), while reducing the excess thickness of the inner corner at the bottom and flattening one end face intersecting the chamfered slope.
In this case, one end surface diameter difference Df formed on one end surface after chamfering is to be secured in advance. However,
Since the pressure receiving area of one end face abutting on the bottom receiving tools 123 and 133 is increased, the surface pushing load per unit area applied to the bottom of the bottomed cylindrical body is reduced, and the smooth area of the one end face is increased. It is necessary 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 of the bottomed cylindrical body is easily deformed, and it is difficult to secure a wide smooth area on one end face formed after the bottoming and chamfering.

Further, in order to solve the above-mentioned problems, the pressing force for pressing the both end surfaces of the body of the bottomed cylinder is reduced to increase the number of repetitions of the surface pressing process a plurality of times. There has been a problem that the manufacturing cost is increased, the processing cost is increased, and the productivity is low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to reduce the number of pressing steps and to make the shape of the barrel of the bottomed cylinder less likely to deform. In addition, the smooth surface of the one end face intersecting with the chamfered slope is widened, and chamfering is performed at the inner corner of one end of the tubular body, and the one end face is pressed smoothly, and the vicinity of the one end is pressed smoothly. It is intended to provide a method of processing.

[0010]

In order to achieve the above-mentioned object, according to a first aspect of the present invention, there is provided a method for press-working an end of a cylindrical body. A method of performing press working so that one end surface is smooth and one end portion is formed smoothly, and after a bottomed cylindrical body material having a predetermined shape is formed in an upstream process, the next bottom surface is formed. In the punching process, one bottom surface of the bottomed cylindrical body material is brought into contact with the cutting edge of the bottomed tool, and the cutting blade of the bottomed punch is pressed against the other surface of the bottom to remove the bottom of the bottomed cylindrical body material. In the next chamfering step, the inner and outer peripheries near at least one end of the both-end opening cylinder are regulated so that the inner corner of the chamfering tool of the chamfering tool has one end inner angle. Contact and press, and open at both ends To form a chamfered cylinder, and in the next crushing step, regulate the inner and outer peripheries near at least one end of the chamfered cylinder so that one end is brought into contact with the crushed surface of the crushing tool, and pressed. Then, one end surface of the chamfered cylinder is crushed to be smooth by crushing to form an end of the cylinder.

According to the structure of the present invention, since the bottomed cylindrical body material is bottomed by removing the bottom portion, chamfered, and then crushed, the pressing step can be omitted. Further, in the crushing step, the pressure receiving area of the one end face which comes into contact with the crushing tool can be reduced, and crushing can be performed with a small pressing force when pressing both end faces of the body. Therefore, the shape of the cylindrical body is not deformed, the smooth area of the one end face intersecting with the chamfered slope is formed wide, and the overall length can be easily determined.

The bottom punching process according to claim 2 is a method in which the bottomed cylindrical body material formed in the upstream step is processed after the bottom is pressed. After the cylindrical material is formed, in the next bottom pressing step, the inner and outer peripheries of at least the vicinity of the bottom of the bottomed cylindrical material are regulated, one bottom surface is brought into contact with the bottom receiving tool, and the other bottom surface is formed. Pressing the bottom pressing punch so as to sandwich at least the vicinity of the inside angle, forming a flat bottom cylinder by pressing the bottom to reduce the excess thickness of the bottom inside corner of the bottomed cylinder material, and forming a flat bottom cylinder in the next bottoming step A bottom end is removed to form a two-end open cylinder, and in the next chamfering step, an inner corner of one end of the two-end open cylinder is chamfered to form a chamfered cylinder, and in the next crushing step, the chamfered cylinder is formed. 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 bottom is cut to reduce the excess thickness of the bottom inner corner of the bottomed cylindrical body material. Is easily formed smoothly, and has the effect of improving the wear resistance of the respective cutting edges of the bottom punch and the bottom tool. Furthermore, even in difficult-to-machine materials such as stainless steel plates, bottoming can be easily performed.

According to a third aspect of the present invention, in the chamfering step, the outer periphery near at least one end of the open-ended cylindrical body is regulated by a chamfering guide die, and the inner periphery near at least one end is regulated by a tip guide portion of a chamfering tool. Then, the inner corner of one end is brought into contact with and pressed against the chamfered conical surface of the chamfering tool, and the inner end of the cylindrical body having both ends opened is chamfered to the inner corner.

According to the structure of the present invention, since the inner and outer peripheries near at least one end of the open-ended cylindrical body are regulated and the chamfer is formed at the inner corner of the one end, a desired chamfered shape can be easily formed. In addition, it functions to prevent burrs from being generated at the chamfer angle.

In the crushing step according to a fourth aspect, the outer periphery near at least one end of the chamfered cylinder is crushed and regulated by a guide die, and the inner periphery near at least one end is crushed and regulated by a tip guide portion of a punch. One end face is brought into contact with and pressed against the crushing surface of the crushing tool, and crushing is performed so that one end face of the chamfered cylinder is crushed and smoothed.

According to the structure of the present invention, the inner and outer peripheries near at least one end of the chamfered cylindrical body are regulated and the one end face is crushed so as to be flattened. The pressure receiving area of the end surface can be reduced, and the pressing process can be performed with a small pressing force when pressing the both end surfaces of the body. Therefore, the shape of the cylindrical body is not deformed, the smooth area of the one end face intersecting with the chamfered slope is formed wide, and the overall length can be easily determined. Furthermore, even in difficult-to-process materials such as stainless steel plates, this crushing can be easily performed.

The bottomed cylindrical body material processed in the upstream step according to the fifth aspect is a cylindrical body with a flange having a flange formed in an opening, and a chamfer is formed at an inner corner at one end of the cylindrical body with the flange. Processing and crushing of one end face are performed.

According to the structure of the present invention, since the bottomed cylindrical body material processed in the upstream step is formed with a flange at the opening, the opening is pressed in bottom pressing, chamfering or crushing. In this case, the opening can be pressed with a large pressing force without deforming the opening.

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

According to the structure of the present invention, the bottomed cylindrical body material processed in the upstream process is formed with a step.
The stepped cylindrical body, which is not limited to the straight cylindrical body and is liable to buckle at the step, is also chamfered to the inner corner at one end, and the one end surface is formed smoothly, and the vicinity of the one end is formed smoothly. Press working is possible.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to 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 bottom punching step, FIG. 4 is an enlarged view of a chamfering step, and FIG. 6 to 8 are cross-sectional views of a workpiece processed in each step.

As shown in FIG. 1, in the step of pressing the end of the cylindrical body according to the present invention, in the upstream process Or, the flange portion Ra and the step portion Rc shown in FIG.
After the work material R of the bottomed cylindrical body having the following is formed, in the next bottom surface pushing step Os, the bottom portion Re of the work material R is formed.
6 (b)
A work S of a flat bottom cylindrical body shown in FIG. In the next bottom punching step Ot, bottom punching is performed to remove the bottom Se of the workpiece S to form a workpiece T having a double-ended cylindrical body shown in FIG. 7A. In the next chamfering step Ou, the inner edge of the lower end Te of the workpiece T is chamfered to form a chamfered cylindrical workpiece U shown in FIG. 7B. In the next crushing step Ov, the lower end surface Ug of the work U is crushed by crushing to make the lower end surface Ug smooth and the peripheral edge of the lower end portion Ue smooth. It is constituted by a press working step of the end of the cylindrical body forming the work V.

In the above-described bottom pressing step Os, the die holder 21 is attached to the lower base 1 provided on the upper surface of a bolster (not shown) of the press machine, and the bottom pressing guide die 22 and the urethane Elastic spring 2
6 and the bottom receiving tool 23 are fitted in the die holder 21 while being regulated in the vertical direction. As shown in FIG. 2, a large-diameter guide hole 22a into which the outer periphery of a large-diameter trunk portion Rb of a bottomed cylindrical work material R can be inserted, and a small-diameter cylinder of the work material R are provided on the inner periphery of the bottom push guide die 22. A small-diameter guide hole 22b into which the outer periphery of the portion Rd can be inserted is formed, and the step between them is formed so that the step Rc of the work material R does not abut.

In the urethane elastic spring 26 using an elastic material having a spring action, a gap is provided between the outer periphery and the inner periphery of the die holder 21, and the inner periphery is in contact with the outer periphery of the trunk 23 a of the bottom receiving tool 23. Each is formed so that a gap is provided between them. Further, the bottom receiving tool 23 is
The outer periphery of a is formed to be insertable into the small-diameter guide hole 22b of the bottom push guide die 22, the upper end thereof is formed in 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 that can move up and down with the slide is attached to an upper base 2 provided on the lower surface of a slide (not shown) of the press machine.
A bottom pressing punch 25 is integrally attached to the inside of the punch 4. As shown in FIG. 2, the bottom pressing punch 25 has a large-diameter guide portion 25a which can be inserted into the large-diameter body portion Rb of the work material R below the shank portion. Small-diameter guide portion 25 that can be inserted into body portion Rd
b is formed. The lower end of the small-diameter guide portion 25b is formed in a flat surface, and a chamfer having a small radius is formed at an edge of the flat surface.

The large-diameter guide portion 2 of the bottom pressing punch 25
5a, a stripper 28 is inserted.
Numeral 8 is vertically moved by vertical driving means (not shown) in relation to the vertical movement of the slide, and presses the upper surface Rf of the flange of the work material R at a position near the lower end, and the flange Ra
When the lower surface contacts the upper end surface of the bottom pressing guide die 22, the bottom pressing guide die 22 urged by the urethane elastic spring 26 is used.
And the lower end surface of the stripper 28 sandwich the flange Ra.

In the bottom pressing process in the bottom pressing process Os configured as described above, the work material R of the bottomed cylindrical body transferred from the upstream process Or is lowered together with the bottom pressing punch 25, and the work is formed near the lower end. As for the material R, the flange upper surface Rf is pressed at the lower end surface of the stripper 28,
The lower surface of the bottom Re contacts the upper end surface of the bottom receiving tool 23 waiting below.

Next, when the lower end of the small diameter guide portion 25b of the bottom pushing punch 25 descends while slidingly contacting the extra thickness of the inner corner of the bottom Re of the work material R, when the bottom pushing punch 25 reaches the descending end position shown in FIG. 6B, the bottom surface of the workpiece material R is sandwiched by the flat surface of the upper end of the bottom receiving tool 23 waiting below and the flat surface of the lower end of the bottom pressing punch 25 and the flat edge so as to sandwich the vicinity of the bottom Re angle of the work material R. As shown in the figure, the bottom Se of the work S of the flat bottom cylindrical body in which the excess thickness at the bottom inner corner is reduced is formed. That is, the inner angle radius r1 and the outer angle radius r2 of the bottom Se shown in FIG.

At the time of this bottom pressing, the outer periphery of the small diameter body portion Rd of the work material R is regulated by the small diameter guide hole 22b of the bottom press guide die 22.
By pressing the flange upper surface Rf with the stripper 28, the excess thickness at the inner angle of the bottom Re is moved toward the outer angle of the bottom Re, and is ironed. Therefore, it is possible to prevent the excess thickness at the inner corner of the bottom Re from being scraped off at the lower end edge of the bottom pressing punch 25 and to reduce the thickness of the bottom Se of the flat bottom cylindrical work S having the bottom pressed.

The flat-bottomed cylindrical workpiece S pressed in this manner is pressed upward by a knockout 27 which rises in relation to the bottom-pressing punch 25 and the stripper 28, and is gripped by fingers of a transfer mechanism (not shown). , And work S consists of finger and stripper 2
8 and is released from the bottom pressing punch 25 and transferred to the next bottoming step Ot.

In the next bottoming step Ot, the die holder 31 is attached to the lower base 1 provided on the upper surface of the bolster (not shown), and the bottoming guide die 32 and the bottoming tool 33 are sequentially placed in the die holder 31 from above. 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 periphery of the large-diameter trunk portion Sb of the flat-bottomed work S can be inserted, and an outer periphery of the small-diameter trunk portion Sd of the work S, as shown in FIG. And a small-diameter guide hole 32b through which the step S can be inserted, and a step between them is formed so that the step Sc of the work S does not abut.

The bottom punching tool 33 has a small-diameter hole 3 having the same inner diameter as the inner diameter of the small-diameter trunk portion Sd of the flat-bottom cylindrical work S at the upper end side.
3a and a large-diameter hole for discharging the scrap Ts whose bottom is removed below the small-diameter hole 33a. One cutting edge is formed at the inner peripheral angle of the small diameter hole 33a intersecting with the upper end surface of the bottom cutting tool 33 so as to be able to shear the bottom Se of the work S.

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

The large-diameter trunk 35a of the bottom punch 35
The stripper 38 is inserted through the
Is configured to be moved up and down by up and down driving means (not shown) in relation to the up and down movement of the slide.

In the bottoming process in the bottoming process Ot configured as described above, the work S of the flat bottom cylindrical body transferred from the bottom pressing process Os is lowered together with the bottoming punch 35, and the bottom surface of the bottom Se is bottomed. The work S reaches the lower end position by contacting the upper end surface of the punching tool 33. After the work S reaches the lower end position, when the bottom punch 35 is further continued to be lowered, the bottom Se of the work S is formed at one of the upper inner peripheral angles of the small diameter holes 33a of the bottom punch tool 33. The bottom is punched by the shearing action of the cutting blade and the other cutting blade formed at the lower edge of the small diameter guide portion 35c of the bottom punch 35, and as shown in FIG. T is formed.

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

The work T of the open-ended cylindrical body which has been bottomed in this way rises together with the bottom punch 35,
The workpiece T is gripped by a finger of a transfer mechanism (not shown), and is separated from the bottom punch 35 by the action of the finger and the stripper 38, so that the next chamfering step Ou
Is transferred to

In the next chamfering step Ou, a die holder 41 is attached to the lower base 1 provided on the upper surface of a bolster (not shown), and a chamfering guide die 42 and a die liner 46 are sequentially placed in the die holder 41 from above. A chamfering tool 43 is inserted in the inside of each of them so as to be able to move up and down. As shown in FIG. 4, a large-diameter guide hole 42a into which the outer periphery of the large-diameter trunk portion Tb of the work T having the open-ended cylindrical body can be inserted, and an outer periphery of the small-diameter trunk portion Td of the work T are formed on the inner periphery of the chamfering guide die 42. And a small-diameter guide hole 42b into which a workpiece T can be inserted, and a step between them is formed so that the step Tc of the work T does not abut.

A guide hole 46a is formed on 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. The chamfering tool 43 can be inserted into the small-diameter body portion Td of the work T of the open-ended cylindrical body at the upper end, and can be inserted into the small-diameter guide hole 42b of the chamfering guide die 42 below it. A main body 43c, a conical surface 43b whose diameter is expanded downward between the lower end of the inner peripheral guide 43a and the upper end of the main body 43c, and a flange 43d that can be inserted into the inner periphery of the die liner 46 below the main body 43c. Are formed. The chamfering tool 43 presses the knockout 47 inserted through the lower die 1 so that the upper surface of the flange 43 d is
2 and lowers to the lower end position where the lower surface of the flange 43 d abuts on the lower die 1 by pressing a chamfering punch 45 described later.

On the other hand, a punch holder 44, which can move up and down with the slide, is attached to the upper base 2 provided on the slide lower surface (not shown) of the press machine.
Inside 4, a chamfering punch 45 is integrally attached. As shown in FIG. 4, the chamfering punch 45 has a large-diameter trunk portion 45a into which a stripper 48, which will be described later, can be inserted, and a large-diameter trunk portion Tb of the work T below the shank portion.
A medium-diameter guide portion 45b that can be inserted into the 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 medium-diameter guide portion 45b. Can be pressed.

The large-diameter trunk portion 45a of the chamfering punch 45
, A stripper 48 is inserted.
Is configured to be moved up and down by up and down driving means (not shown) in relation to the up and down movement of the slide.

Then, in the chamfering process in the chamfering step Ou configured as described above, the work T of the open-ended cylindrical body transferred from the bottom punching step Ot is pressed by the lower surface of the large-diameter trunk portion 45a of the chamfering punch 45. Down, work T
Is guided by the inner peripheral guide portion 43a of the chamfering tool 43 so that the lower surface of the lower end Te abuts on the small diameter portion of the conical surface 43b of the chamfering tool 43. When the chamfering punch 45 is further continuously lowered, the inner angle of the lower end Te of the workpiece T is chamfered by the pressing action from the lower end face to the upper end direction by the conical surface 43b of the chamfering tool 43, and at the lower end position shown in FIG. As shown in FIGS. 7B and 7C, a chamfered inclined surface Uh is formed at an inner corner of the lower end of the work U of the chamfered cylindrical body.

At the time of this chamfering, the outer periphery of the small-diameter copper portion Td of the work T is placed in the small-diameter guide hole 42 of the chamfer guide die 42.
b, and the inner circumference of the small-diameter trunk portion Td of the workpiece T is regulated by the outer circumference of the inner circumference guide portion 43a of the chamfering tool 43, so that the chamfering angle of the workpiece U can be chamfered so that burrs do not occur. .

The work U of the chamfered cylindrical body thus chamfered is subjected to the chamfering punch 45 and the stripper 4.
8, the workpiece U is pressed upward by a knockout 47 which rises in relation to the workpiece 8, and is gripped by a finger of a transfer mechanism (not shown).
With the operation described above, it is separated 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 base 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 while being restricted in the vertical direction, and a crushing tool 53 is inserted into each of the die holders 51 in a vertically movable manner. Have been. As shown in FIG. 5, a large-diameter guide hole 52a into which the outer periphery of the large-diameter trunk Ub of the work U of the chamfered cylindrical body can be inserted, and an outer periphery of the small-diameter trunk Ud of the work U are provided on the inner periphery of the crushing guide die 52. A small-diameter guide hole 52b that can be inserted is formed, and a step between them is formed so that the step 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 flange 53d of the crushing tool 53 can be inserted. The crushing tool 53 has a body 53c that can be inserted upward into the small-diameter guide hole 52b of the guide die 52.
And a guide hole 56a of the die liner 56 below the body 53c.
53d that can be inserted into the body, and a recess 5 in the upper end surface of the body 53c
A bulging edge 53b is formed on the periphery of 3a. The inner periphery of the bulging edge 53b is formed so that a small-diameter guide portion 55c of a crushing punch 55 described later can be inserted.
The upper surface of the flange portion 53d is crushed by the pressing of the knockout 57 inserted through the lower die 1 and rises to the upper end position in contact with the guide die 52, and the flange portion 53d is pressed by the crushing punch 55.
The lower surface descends to the lower end position where it contacts the lower die 1.

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

The large-diameter guide portion 55a of the crushing punch 55
A stripper 58 is inserted through the
Is configured to be moved up and down by up and down driving means (not shown) in relation to the up and down movement of the slide.

Then, the crushing step O thus configured
In the crushing process in v, the workpiece U of the chamfered cylinder transferred from the chamfering step Ou is crushed by the large-diameter trunk portion 55 of the crushing punch 55.
a The lower diameter guide portion 55c of the crushing punch 55 is inserted and guided by the inner periphery of the bulging edge 53b of the crushing tool 53, so that the lower end surface Ug of the work U is
3 is in contact with the upper end of the bulging edge 53b. Crush punch 55
Is continuously lowered, the lower end surface Ug of the workpiece U is
Is crushed by a pressing action from the lower end surface to the upper end direction by the bulging edge 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 periphery of the small diameter body Ud of the work U is regulated by the small diameter guide hole 52b of the crush guide die 52, and the inner periphery of the small diameter body Ud of the work U is the small diameter guide 55c of the crush punch 55. Because it is regulated by the outer periphery, the work V can be crushed so as not to bulge in the vicinity of the lower end Ve. In addition, since the pressure receiving area of the lower end surface Ug of the work U that is in contact with the upper end of the bulging edge 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.

Accordingly, the lower end face diameter difference Df intersecting with the chamfered slope Vh shown in FIG. 8B can be easily increased without deforming the shape of the work.
Has a large smooth area, and the overall length can be easily determined.

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

[0055]

Another embodiment of the present invention will be described below with reference to FIG.

As shown in FIG. 9, in the press working step of the end of the cylindrical body according to this embodiment, in the upstream process Or, a work of a bottomed cylindrical body having a flange Ra and a step Rc shown in FIG. After the material R is formed, in the next bottoming step Ot, bottom work Re for removing the bottom Re of the work material R is performed to form a work T having a double-ended cylindrical body shown in FIG. 7A. In the next chamfering step Ou, the inner edge of the lower end Te of the workpiece T is chamfered to form a chamfered cylindrical workpiece U shown in FIG. 7B. In the next crushing step Ov, the lower end surface Ug of the work U is crushed by crushing to make the lower end surface Ug smooth and the peripheral edge of the lower end portion Ue smooth. It is constituted by a press working step of the end of the cylindrical body forming the work V.

That is, the configuration of the processing step of this example is such that the bottom pushing step Os shown in FIG. 1 is omitted, and the bottom punching step Ot, the chamfering step Au, and the crushing step Ov are the same as those in FIG. Since the configuration is the same as that of each of the steps described, the same components are denoted by the same reference numerals and detailed description thereof will be omitted.

In the bottom punching step Ot in the above-described bottom punching step Ot, the work material R of the bottomed cylindrical body transferred from the upstream step Or is lowered together with the bottom punching punch 35, and the bottom R
e The lower surface contacts the upper end surface of the bottom punching tool 33, and the workpiece material R reaches the lower end position. When the bottom punch 35 is further lowered after the work material R reaches the lower end position, the bottom Re of the work material R is formed at the upper end inner peripheral angle of the small-diameter hole 33 a of the bottom tool 33. One cutting edge,
The bottom is punched by a shearing action with the other cutting edge formed at the lower edge of the small diameter guide portion 35c of the bottom punch 35,
As shown in FIG. 7A, a work T having a cylindrical body having both ends open is formed.

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

The workpiece T thus punched out from the bottom
Rises together with the bottom punch 35, is gripped by a finger of a transfer mechanism (not shown), and
Is separated from the bottom punch 35 by the action of the finger and the stripper 38 and transferred to the next chamfering step Ou.

In the chamfering process in the next chamfering step Ou, the work T of the cylindrical body having both ends opened and transferred from the bottom punching step Ot is pressed down by the lower surface of the large-diameter trunk portion 45a of the chamfering punch 45 and descends. The lower end portion 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 portion Te contacts the small diameter portion of the conical surface 43b of the chamfering tool 43. When the chamfering punch 45 is further continuously lowered, the inner angle of the lower end Te of the workpiece T is chamfered by the pressing action from the lower end face to the upper end direction by the conical surface 43b of the chamfering tool 43, and at the lower end position shown in FIG. FIG. 7B,
As shown in (c), a chamfered inclined surface Uh is formed at the lower inner corner of the work U of the chamfered cylinder.

At the time of this chamfering, the outer periphery of the small-diameter copper portion Td of the work T is placed in the small-diameter guide hole 42 of the chamfer guide die 42.
b, and the inner circumference of the small-diameter trunk portion Td of the workpiece T is regulated by the outer circumference of the inner circumference guide portion 43a of the chamfering tool 43, so that the chamfering angle of the workpiece U can be chamfered so that burrs do not occur. .

The work T chamfered in this way
Is pressed upward by a knockout 47 which rises in relation to the chamfering punch 45 and the stripper 48, is gripped by a finger of a transfer mechanism (not shown), and the work U is separated from the chamfering 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 chamfered cylindrical body transferred from the chamfering step Ou is pressed down by the lower surface of the large-diameter trunk portion 55a of the crushing punch 55 and descends, and the small-diameter guide of the crushing punch 55 The part 55c is inserted and guided inside the bulging edge 53b of the crushing tool 53,
Abuts against the upper end of the bulging edge 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 from the lower end surface to the upper end direction by the bulging edge 53b of the crushing tool 53, and the lower end shown in FIG. In the position shown in FIG.
As shown in (b), the lower end surface Vg of the cylindrical work V is formed smoothly.

In this crushing operation, the outer circumference of the small diameter body Ud of the work U is regulated by the small diameter guide hole 52b of the crush guide die 52, and the inner circumference of the small diameter body Ud of the work U is the small diameter guide 55c of the crush punch 55. Because it is regulated by the outer periphery, the work V can be crushed so as not to bulge in the vicinity of the lower end Ve. In addition, since the pressure receiving area of the lower end surface Ug of the work U that is in contact with the upper end of the bulging edge 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 with the chamfered slope Vh shown in FIG. 8B can be easily increased without deforming the shape of the work.
Has a large smooth area, and the overall length can be easily determined.

The work V crushed in this way
Is pressed upward by a knockout 57 that rises in relation to 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. In the downstream process Ow, the flange portion Va of the work V is trimmed, and the completed cylindrical work W shown in FIG. 8C is discharged below the lower base 1.

In the above-described crushing step Ov, the concave portion 53a of the crushing tool 53 is formed as a convex portion that can be inserted into the inner periphery of the small-diameter trunk 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 this convex part.

Further, an air vent hole (not shown) is appropriately formed in the mold or tool in each of the above-described steps, so that the mold or the tool can operate smoothly in each of the steps.

Although the above-described work has been described as a work having a flange portion and a step portion, the method of pressing a cylindrical end portion according to the present invention is also applied to a work having no flange portion or step portion. What you get.

[0071]

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

After the bottomed cylindrical body material is formed in the upstream step, the bottom is removed in the next bottoming step to remove the bottom of the bottomed cylindrical body material to form a double-ended cylindrical body, and the next chamfering step is performed. At one end, an inner corner of the open-end cylindrical body is chamfered to form a chamfered cylindrical body, and in the next crushing step, one end face of the chamfered cylindrical body is crushed to be smoothed to form an end of the cylindrical body. Since the steps are performed in the same order, the surface pushing step can be omitted. Further, in the crushing step, the pressure receiving area of the one end face which comes into contact with the crushing tool can be reduced, and crushing can be performed with a small pressing force when pressing both end faces of the body. Therefore, the shape of the cylindrical body is not deformed, the smooth area of the one end face intersecting the chamfered slope is formed wide, and the overall length can be easily determined.

In the bottoming step, a bottom pressing step is provided between the upstream step and the bottom punching step. In this step, the bottom pressing is performed after the bottom pressing to reduce the excess inner bottom corner of the bottomed cylindrical material. Since the punching is performed, the cut surface can be easily formed smoothly, and the wear resistance of each cutting edge of the bottom punch and the bottom tool is improved. Furthermore, even for difficult-to-machine materials such as stainless steel plates,
Bottom punching can be easily performed.

Further, in the chamfering step, the inner and outer peripheries near at least one end of the open-ended cylindrical body are regulated so that the chamfer is formed at the inner corner at one end, so that a desired chamfered shape can be easily formed, and This has the effect that no burrs are formed on the chamfer angle.

In the crushing step, the inner and outer peripheries in the vicinity of at least one end of the chamfered cylinder are regulated to crush the one end face to make it smooth. The pressure receiving area can be reduced, and the pressing process can be performed with a small pressing force when pressing the both end surfaces of the body. Therefore, the shape of the cylindrical body is not deformed, the smooth area of the one end face intersecting the chamfered slope is formed wide, and the overall length can be easily determined. further,
This crushing process can be easily performed even on difficult-to-process materials such as stainless steel plates.

Further, since the bottomed cylindrical body material processed in the upstream process is formed with a flange at the opening, the opening is pressed when the opening is pressed in bottom pressing, chamfering or crushing. There is an effect that pressing can be performed with a large pressing force without deformation.

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

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a configuration of the present invention, and is a cross-sectional view of a center axis at a processing lower end position in each step.

FIG. 2 is an explanatory view of a bottom pressing step, and is an enlarged sectional view of the bottom pressing step of FIG. 1;

FIG. 3 is an explanatory view of the bottoming step, and is an enlarged sectional view of the bottoming step of FIG. 1;

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

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

FIGS. 6A and 6B show the shape of a workpiece processed by the process of the present invention in each step, wherein FIG. 6A shows a workpiece material processed in an upstream process, FIG. 6B shows a workpiece after bottom pressing, and FIG. b)
FIG. 4 is an enlarged cross-sectional view of the bottom corner of FIG.

FIG. 7 (a) is a work after bottom punching,
(B) is a workpiece after chamfering, (c) is an enlarged sectional view of one end of (b).

8 (a) is a work after crushing, and FIG.
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 a configuration of another embodiment of the present invention, and is a cross-sectional view of a center axis line at a processing lower end position in each step.

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

[Explanation of symbols]

 22 bottom push guide die 23 bottom receiving tool 25 bottom push punch 32 bottom punch guide die 33 bottom punch tool 33a small diameter hole 35 bottom punch 35c small diameter guide section 42 chamfer guide die 42b small diameter guide hole 43 chamfer tool 43a inner circumference guide section 43b Conical surface 43c Trunk 45 Chamfering punch 45c Small diameter guide 52 Crush guide die 52b Small diameter guide hole 53 Crush tool 53a Depression 53b Swelling edge 53c Body 55 Crush punch 55c Small diameter guide Df Lower diameter difference Or Upstream process Os Bottom Pushing process Ot Bottom cutting process Ou Chamfering process Ov Crushing process Ow Downstream process R Work material of bottomed cylindrical body S Work of flat bottomed cylinder Se Bottom T Workpiece of both ends open cylindrical body Te Lower end U Work of chamfered cylindrical body Ue Lower end Ug Lower end surface Uh Chamfered slope V Workpiece of cylindrical body Ve Lower end portion Vg Bottom End face Vh Chamfer slope W Workpiece of cylindrical body

Claims (6)

[Claims] An inner corner of one end of a cylindrical body formed of a metal material is chamfered, and one end surface is smoothed and
This is a method of press working so as to form the vicinity of one end smoothly, after forming a bottomed cylindrical body material having a predetermined shape in an upstream process, in a subsequent bottoming step, the cutting edge of a bottoming tool is used. One side of the bottom of the bottom cylindrical body material is abutted, and the cutting edge of the bottom punch is pressed against the other side of the bottom, and the bottom of the bottomed cylindrical body material is removed to form a bottom open cylindrical body. In the next chamfering step, the inner and outer peripheries near at least one end of the both-end opening cylindrical body are regulated so that the inner corner of one end abuts against the chamfering conical surface of the chamfering tool, and is pressed, and the both-end opening cylindrical body is pressed. Chamfering the inside corner of one end to form a chamfered cylinder, and in the next crushing step, regulate the inner and outer peripheries near at least one end of the chamfered cylinder and abut one end against the crushed surface of the crushing tool And press it, crush one end 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 process is a method in which a bottomed cylindrical body material formed in an upstream step is processed after being pressed into the bottom face, and a bottomed cylindrical body material having a predetermined shape is formed in the upstream step. After that, in the next bottom pushing step, the inner and outer peripheries of at least the vicinity of the bottom of the bottomed cylindrical body material are regulated, and one bottom surface is brought into contact with the bottom receiving tool, and at least the vicinity of the inner angle of the other bottom surface. Pressing the bottom pressing punch so as to sandwich it, forming a flat bottom cylinder by pressing the bottom to reduce the excess of the inner corner of the bottom of the bottomed cylinder material, forming a flat bottom cylinder, and removing the bottom of the flat bottom cylinder in the next bottoming step In the next chamfering step, a chamfering process is performed on an inner corner of one end of the both-end opening cylindrical body to form a chamfered cylindrical body, and in the next crushing step, one end surface of the chamfered cylindrical body is formed. Crush and smooth to crush Press-forming method of the cylindrical body end according to claim 1, characterized in that so as to form an end. 3. The chamfering step, wherein the outer periphery near at least one end of the open-ended cylindrical body is regulated by a chamfer guide die, and the inner periphery near at least one end is regulated by a tip guide portion of the chamfer tool. The cylindrical end according to claim 1 or 2, wherein an inner corner at one end is brought into contact with and pressed against the chamfered conical surface, and chamfering is performed at the inner corner at one end of the cylindrical body having both ends opened. Press working method. In the crushing step, the outer periphery near at least one end of the chamfered cylinder is crushed and regulated by a guide die, and the inner periphery near at least one end is crushed and regulated by a tip guide portion of a punch.
4. A crushing process in which one end surface is brought into contact with and pressed against a crushing surface of a crushing tool to crush and flatten one end surface of a chamfered cylinder.
3. The method for pressing a cylindrical body end according to claim 1. 5. A bottomed cylindrical body material processed in an upstream step is a flanged cylindrical body having a flange formed in an opening, and chamfering an inner corner of one end of the flanged cylindrical body, 5. The method according to claim 1, wherein the crushing process is performed. 6. A bottomed cylindrical body material processed in an upstream step is a stepped cylindrical body formed such that the bottom body diameter is smaller than the opening side body diameter. 6. The method according to claim 1, wherein the inner corner of one end is chamfered and the other end is crushed.