JP3709285B2 - Press drilling device for cylindrical workpiece with inner side stepped groove - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press punching device for a side wall of a cylindrical member having a stepped groove on an inner surface.
[0002]
[Prior art]
A cylindrical part having a stepped groove on the inner surface is provided with a stepped groove part for supplying lubricating oil to the sliding surface of the inner surface or for screwing a set screw for fixing a part incorporated in the cylindrical member. It is necessary to make a hole in the wall. 1 (a) to 1 (c) illustrate holed tubular parts 1-1, 1-2, and 1-3 having stepped grooves. The cylindrical part is provided with stepped grooves 1a, 1b and 1c, and the stepped grooves 1a, 1b and 1c are provided with through holes 2a, 2b and 2c, respectively.
[0003]
[Problems to be solved by the invention]
When performing such drilling by press working, if the press punching is performed by the punching punch in a state where the die die is not brought into close contact with the inner surface stepped groove of the cylindrical part, the product is deformed at the time of punching. Therefore, conventionally, considering that it is difficult to make a hole with a press, the wall portion of the stepped groove portion of the cylindrical part having the stepped groove has been drilled by drilling. However, when drilling with a drill, the dimensional accuracy and hole position accuracy after drilling varies, back burrs are generated, chips are generated, cutting oil is scattered, There are also problems such as long processing time.
[0004]
On the other hand, when drilling with a press, depending on the shape, if it is only on one side of a cylindrical part having a stepped groove on the inner surface, a cylindrical member 4 is formed on a semi-cylindrical die 3 as shown in FIG. Can be drilled by pressing using the punch 6 on the stepped die 3 having a semicircular cross section in a state where the stepped grooves of the cylindrical member are in close contact with the stepped portions 5 and 5. However, according to this method, the operator has to position and insert the stepped groove of the cylindrical member into the stepped portions 5 and 5 of the die die 4 each time, and the punched punch residue 7 is It will remain inside the product.
[0005]
The present invention improves the dimensional accuracy of the hole and the positional accuracy of the hole without causing deformation in the wall portion of the step groove portion of the stepped groove cylindrical part of the cylindrical workpiece having the step groove. It is an object of the present invention to provide a press punching device for a cylindrical workpiece having inner side stepped grooves which can be punched by pressing while ensuring.
[0006]
[Means for Solving the Problems]
The press punching device for a cylindrical body having an inner surface stepped groove according to the present invention is fixed on a processing table, and the inner surface of a stepped groove provided on the inner surface of a cylindrical workpiece on the outer surface is provided. A die mold having a convex step portion having a shape commensurate with the side surface shape and capable of loosely fitting a cylindrical workpiece on the outer peripheral portion, and a workpiece to be loosely fitted on the outer peripheral portion of the die mold A workpiece holding mechanism that slidably holds the workpiece, and a die that is moved in the direction of the die during the press drilling operation, and is supported so as to be movable on the processing table in a state where the die can be moved close to and away from the die. The workpiece pressing mechanism that enables the inner surface stepped groove surface of the workpiece to be pressed against and fixed to the outer surface of the convex step portion of the mold, and pressed against the outer surface of the die step portion of the die Press drilling on the wall of the inner stepped groove on the workpiece Characterized in that it consists of a press drilling mechanism that.
[0007]
The press punching apparatus for a cylindrical body having a stepped groove on the inner surface according to the present invention holds a workpiece in a state of loosely fitting to the outer periphery of the die mold by the workpiece holding mechanism, and dies the workpiece pressing mechanism. Moves in the direction of the mold and presses and fixes the inner surface stepped groove surface of the workpiece to the outer surface of the die mold convex stepped portion, and in this state, presses against the outer surface of the die mold convex stepped portion. It becomes possible to carry out press drilling in the wall portion of the inner surface stepped groove of the processed member. After the press drilling, the workpiece is held again by the workpiece holding mechanism in a loosely fitted state on the outer periphery of the die. As a result, the workpiece can be removed upward from the die.
[0008]
Therefore, a series of steps including loose fitting of the workpiece to the die, close contact of the stepped groove portion of the workpiece to the outer periphery of the die-shaped convex step, press drilling, and removal of the workpiece from the die die are performed. It is possible to carry out smoothly and to automate these series of steps. The cylindrical workpiece is not only a cylindrical shape but also a hollow cylindrical body having an elliptical cross section, a square cross section, a polygonal cross section, and the like.
[0009]
Embodiment
Hereinafter, a press drilling mechanism that performs press drilling on the wall portion of the inner side stepped groove of the workpiece of the present invention will be described in detail.
The following is mentioned as a preferable embodiment of the press drilling mechanism which performs press drilling in the wall part of the inner surface stepped groove of the workpiece of the present invention.
[0010]
(1) The workpiece holding mechanism and the workpiece holding mechanism are integrated as the workpiece holding / holding mechanism, and the pressing operation and press punching of the workpiece holding / pressing mechanism are performed by operating the press drilling mechanism. Perform the action. In this case, after inserting the workpiece into the outer periphery of the die mold from the upper direction and loosely placing it, the press drilling mechanism is driven, and first the loosely fitted to the outer periphery of the die mold by the workpiece holding and pressing mechanism To hold the workpiece, and then further drive the press drilling mechanism to move the workpiece holding / pressing mechanism in the direction of the die, and the inner surface of the workpiece on the outer surface of the convex step of the die Press and fix the stepped groove surface. Thereafter, the press drilling mechanism is further driven to punch the workpiece by punching. By doing so, the configuration of the press punching device for the cylindrical body having the inner side stepped groove can be further simplified.
[0011]
(2) The work member holding mechanism has a work member guide jig disposed between the work member loosely fitted on the outer periphery of the die and the work member pressing mechanism, and is always a work member. Is a work member guide mechanism that is biased in a direction in which it is held in a loosely fitted state on the outer periphery of the die. By doing in this way, it becomes possible to more freely place the member to be processed on the outer periphery of the die mold. The guide jig is not particularly limited as long as it can hold the workpiece inserted and arranged on the outer periphery of the die mold in a loosely fitted state on the outer periphery of the die mold. Examples include a cylindrical shape in which the upper surface is open and a workpiece can be inserted and arranged therein, a type in which the workpiece is inserted and arranged between one holding piece and the like.
[0012]
(3) A die holding mechanism is provided that engages with the die during press punching and prevents the die from bending and deforming due to the press punching load. The die type pressing mechanism may be a type that is clamped from both sides of the die type, or a type that is clamped from both sides of the die type and pressed from above. In the latter case, it is possible to prevent the workpiece from being lifted during press drilling.
[0013]
(4) A pair of the workpiece holding mechanism and the workpiece holding mechanism are provided in a linearly opposite direction around the die die. By doing in this way, it becomes possible to make a hole efficiently by press work with respect to the wall part which has the level | step difference groove | channel on both sides of a to-be-processed member. However, instead of providing a pair of the processing member holding mechanism and the processing member holding mechanism in a linearly opposite direction centering on the die mold, the processing member loosely fitted on the outer peripheral portion of the die mold is an appropriate rotating member. It is also possible to make a press hole at an arbitrary portion of the wall portion having the step grooves on both sides of the workpiece by rotating at an arbitrary angle using.
[0014]
【Example】
Below, the press punching apparatus of the cylindrical workpiece which has an inner surface stepped groove | channel based on this invention based on drawing is demonstrated.
[0015]
FIG. 3 is a perspective view showing an embodiment of a press punching device for a cylindrical workpiece having inner stepped grooves according to the present invention, and FIG. 4 (a), FIG. 4 (b), FIG. 5 and FIG. 6 is a cross-sectional view of the main part of the embodiment shown in FIG. In FIG. 3, a die die 11 is fixedly erected on the processing table A of the press punching device main body, and a pair of support bases B and B are fixed on the processing table A on the opposite sides of the die die 11. Air press machines 12 and 12 for drilling are attached to the pair of support bases B and B, respectively, and workpiece pressing mechanisms 13 and 13 are provided at the ends of the air press machines 12 and 12 on the die mold 11 side. It is attached. Four struts S are erected on the processing table A, and the die-type pressing mechanism 14 is attached to the ceiling plates C1 and C2 attached to the upper part of the struts S.
[0016]
More specifically, in FIG. 4 (a), the workpiece W is loosely fitted to the outer periphery of the die 11 fixed upright at the center of the machining table A, and the lower end surface of the workpiece 11 is the die 11 It is slidably placed on the flange portion 11a. The die 11 has an outer peripheral surface shape corresponding to the shape of a U-shaped stepped groove Wg provided in the circumferential direction on the inner surface of the workpiece W, and has a convex portion 11b extending in the circumferential direction. Is provided. The outer diameter of the convex portion 11 b is such that the workpiece W can be fitted to the outer periphery of the die die 11 and the workpiece W is stepped when the workpiece W is pressed against one side of the die die 11. The inner peripheral surface of the groove Wg is formed so as to be in close contact with the outer peripheral surface of the convex portion 11b of the die 11.
[0017]
In the air press machine 12 attached to each of the pair of support bases B, B, an end attachment plate 12b is fixed to the piston shaft 12a slidably attached to the air press cylinder, and the center of the end attachment plate 12b. A punch 12c is attached to the part. On the other hand, a pressing member 15a of the workpiece W is attached to the inside of the end mounting plate 12b by four bolts 15b, and a spring 15c around the bolt 15b between the end mounting plate 12b and the pressing member 15a. Is loosely fitted to press the holding member 15a inward.
[0018]
A workpiece holding mechanism is formed by the workpiece pressing member 15a, the bolt 15b, and the spring 15c. As shown in FIG. 4b, a concave surface 15d that can be brought into close contact with the outer peripheral surface of the workpiece W is provided on the inner end surface of the workpiece pressing member 15a. The workpiece W can be loosely fitted and installed on the outer periphery of the die 11 between the workpiece holding members 15a and 15a in the outward standby state of the pair of workpiece holding members 15a. Further, a through hole 15e through which the punch passes is provided at the center of the workpiece pressing member 15a.
[0019]
The die-type pressing mechanism 14 includes a clamp 14a and a clamp cylinder 14b that raises and lowers the clamp 14a. A fitting recess 14c provided at an end of the clamp 14a with the clamp 14a lowered and an upper end of the die 11 Are closely fitted to receive a lateral load applied to the die 11 and prevent the workpiece W from being lifted. In this case, as shown in FIG. 4a, the lower end surface of the clamp 14a and the upper end surface of the workpiece W are separated by a minute distance, thereby enabling the workpiece W to slide laterally. .
[0020]
A through hole 11c extending in the axial direction is provided in the central portion of the die mold 11, and a through hole penetrating in the axial direction at a predetermined position in the axial center of the convex portion 11b of the die mold 11 to communicate with the through hole 11c. A hole 11d is provided. When the punch 12c makes a punch hole in the workpiece W, the tip of the punch enters the through hole 11d and discharges processing waste into the through hole 11d. The processing waste accumulated by continuous processing is discharged to the outside through the through hole 11d and the through hole 11c.
[0021]
Next, the operation of this embodiment will be described.
First, the workpiece W is slidably disposed on the outer periphery of the die 11 and the upper surface of the flange portion 11a with the clamp 14a raised and the workpiece holding mechanism retracted. The workpiece pressing plates 15a and 15a are respectively provided between the concave surfaces 15d and 15 of the workpiece pressing plates 15a and 15a on both sides by adjusting the strength of the four bolts 15b and the spring 15c. The outer peripheral surface is loosely fitted and abutted, and the workpiece W is adjusted so as to be positioned substantially concentrically in the die shape. Next, the clamp 14a is lowered and the fitting recess 14c of the clamp 14a and the upper end of the die 11 are closely locked. At this time, a slight gap remains between the lower end surface of the clamp and the upper end portion of the workpiece W. See FIGS. 4a, 4b, and 7a.
[0022]
Next, when the right air cylinder is driven and the right piston shaft 12a is moved in the left direction, the right press plate 15a slides the workpiece W in the left direction on the upper surface of the die-shaped flange so that the step of the workpiece W is performed. The inner peripheral surface of the groove Wg is brought into close contact with the outer peripheral surface of the convex portion 11b of the die 11. See FIG. 7 (b) and FIG. 7 (c). The punch 12c is pushed against the spring force of the spring 15c of the workpiece pressing mechanism by further moving the right piston shaft 12a to the left, and a punch hole is formed at a predetermined position of the stepped groove forming wall portion of the workpiece. I can make it. See FIG. At this time, punch scraps are pushed out by the punch 12 to the right side of the through hole 11d.
[0023]
Next, when the right air cylinder is driven to move the piston shaft 12a to the right and to wait, and the left air cylinder is driven to move the left piston shaft 12a to the right, the left pressing plate 15a is moved to the workpiece. W is slid in the right direction on the upper surface of the die flange, and the inner peripheral surface of the stepped groove Wg of the workpiece W is brought into close contact with the outer peripheral surface of the convex portion 11 b of the die die 11. By further moving the left piston shaft 12a to the right, the punch 12c is pushed against the spring force of the spring 15c of the workpiece pressing mechanism, and a punch hole is formed at a predetermined position of the stepped groove forming wall portion of the workpiece. I can make it. See FIG. At this time, punch scraps are pushed out by the punch 12 to the left side of the through hole 11d.
[0024]
In the above description of the operation, the left and right air cylinders are driven synchronously and the left and right piston shafts 12a and 12a are moved in the same direction to punch holes, but one air cylinder is driven to move the piston shaft. When moving, the other air cylinder can be withdrawn and stopped so that only one of the punch holes can be punched. In this case, by driving the one air cylinder in the reverse direction and retracting the piston shaft, the workpiece W is returned to a position concentric with the die 11 at the center position of the processing table A by the springs 15c and 15c.
[0025]
FIGS. 8 (a), 8 (b), and 9 to 11 show a second embodiment of a press punching device for a cylindrical workpiece having a stepped groove on the inner surface of the present invention. The second embodiment is different from the first embodiment in that a workpiece guide mechanism 30 is disposed between the workpiece pressing mechanism 15 and the die 11. Constituent members that are the same as or similar to the constituent members and parts in the first embodiment are assigned the same reference numerals, and descriptions thereof are omitted.
[0026]
The workpiece guide mechanism includes a cylindrical guide jig 30a concentrically arranged on the outer periphery of the die 11 and cover rails 30b-1 and 30b that are fixed to the upper surface of the processing table A and guide the guide jig 30a. -2 and springs 30c-1 and 30c-2 for holding the guide jig 30a concentrically on the outer periphery of the die 11. The side wall of the guide jig 30a is provided with through holes 30a-1 and 30a-1 through which the punching punches 12c-1 and 12c-2 pass, and extends radially inward at the lower part of the inner peripheral surface. An inner flange 30a-2 is provided, and an outer flange 30a-3 extending outward in the radial direction is further provided on the outer periphery of the lower end.
[0027]
The lower end surface of the inner flange 30a-2 is slidably placed on the upper end surface of the flange portion 11a of the die 11 and the lower end surface of the workpiece W is placed on the upper end surface of the inner flange 30a-2. ing. The lower end surface and the upper end surface of the outer flange 30a-3 are slidably contacted with the upper surface of the processing table A and the upper surface of the concave portion of the cover rail 30b, respectively, and the outer end portion of the outer flange 30a-3 and the cover Springs 30c-1 and 30c-2 are respectively attached between the inner surfaces of the recesses of the rails 30b-1 and 30b-2.
[0028]
In this embodiment, a guide jig center positioning mechanism 40 is provided for reliably holding the guide jig 30a at the center position. The guide jig center positioning mechanism 40 includes a pin 40a slidably fitted in a through hole provided in the processing table A, a center positioning cylinder 40b for biasing the pin 40a upward, and a center positioning cylinder 40b. And a fixing plate 40c to be fixed to the head. The upper end portion of the pin 40a has a conical shape, is slidably in contact with a centering hole provided in the lower end portion of the guide jig 30a, and is fitted at the position shown in FIG. The movement of the pin upward from the position shown in FIG. 8A is restrained by an appropriate means (not shown). The guide jig center positioning mechanism 40 determines the center of the workpiece guide mechanism 30 when the workpiece is inserted into and removed from the die, and when the clamp 14a is lowered, the pin is retracted by the center positioning cylinder. The guide jig 30 can slide freely.
[0029]
Next, the operation of the second embodiment of the press punching device for the cylindrical workpiece having the inner stepped groove of the present invention will be described.
First, in a state where the guide jig 30a is held at the center position of the processing table by the center positioning mechanism 40 and the clamp 14a is raised, the workpiece W is placed on the outer periphery of the die 11 and inside the guide jig 30a. Is mounted on the upper surface of the inner flange 30a-2 (see FIG. 8 (a)), and then the clamp 14a is lowered so that the fitting recess 14c of the clamp 14a and the upper end of the die 11 are tightly connected. Lock. See FIG.
[0030]
Next, the right air cylinder is driven to move the right piston shaft 12a to the left, and the holding plate 15a slides the guide jig 30a to the left on the upper surface of the die-shaped outer flange 11a and the upper surface of the processing table A. The inner circumferential surface of the stepped groove Wg of the workpiece W is brought into close contact with the outer circumferential surface of the concave portion 11 b of the die 11. By moving the right piston shaft 12a further to the left, the punch 12c is pushed against the spring force of the spring 30c-2 of the workpiece guide mechanism, and is punched into a predetermined position on the stepped groove forming wall portion of the workpiece. Make a hole. See FIG. At this time, punch scraps are pushed out to the right side of the through hole 11d by the punch 12c. The spring 15 of the workpiece holding mechanism is stronger than the springs 30c-1 and 30-2 of the guide jig center positioning mechanism 40.
[0031]
Next, when the right air cylinder is driven to move the piston shaft 12a to the right and to wait, and the left air cylinder is driven to the left to move the piston shaft 12a to the right, the left presser plate 15a is moved to the guide jig. 30a is slid rightward on the upper surface of the outer flange 11a of the die 11 and the upper surface of the processing table A so that the inner peripheral surface of the stepped groove Wg of the workpiece W is in close contact with the outer peripheral surface of the concave portion 11b of the die 11 Let The punch 12c is pushed against the spring force of the spring 15c of the workpiece pressing mechanism by further moving the piston shaft 12a-2 to the right, and the punch hole is formed at a predetermined position of the stepped groove forming wall portion of the workpiece. Open. See FIG. At this time, punch scraps are pushed out to the left side of the through hole 11d by the punch 12c.
[0032]
In the above description of the operation, the left and right air cylinders are driven synchronously and the left and right piston shafts 12a and 12a are moved in the same direction to punch holes. However, one air cylinder is driven to move the piston shaft. It is also possible to stop the other air cylinder when performing the operation. In this case, by driving the one air cylinder in the reverse direction and retracting the piston shaft, the workpiece W is returned to a position concentric with the die 11 at the center position of the processing table A by the springs 15c and 15c. In this step, the pin 40a of the center positioning mechanism 40 is pushed into the bottom hole of the guide jig 30a to return the guide jig to the center position.
[0033]
In the above-described embodiment of the present invention, the case where the press holes are formed in the left and right wall portions of the workpiece W has been described. However, those skilled in the art may press the left and right sides, the front and rear, or the front and rear and the left and right. It is easy to make structural changes to the drilling device, and by providing an appropriate rotation means and rotating the workpiece W, a punch hole is made at an arbitrary position in the circumferential direction of the workpiece. As described above, this is also possible.
[0034]
Moreover, in the press punching apparatus for a cylindrical workpiece having an inner surface stepped groove according to the present invention, a plurality of types of die dies can be detachably attached to a plurality of workpieces formed with a plurality of types of stepped grooves on the inner surface. By forming a plurality of stepped grooves on the inner surface with a single press drilling device, by making it possible to attach and fix to the processing table as needed Drilling is possible.
[0035]
【The invention's effect】
In the press punching apparatus for a cylindrical workpiece having an inner stepped groove according to the present invention, the workpiece is slidably held in a state in which the workpiece is loosely fitted to the outer periphery of the die mold, The inner surface stepped groove of the workpiece is pressed against the outer surface of the die-shaped convex step portion by pressing and fixing the inner surface stepped groove surface of the workpiece on the outer surface of the die-shaped convex step portion. Can be punched in the wall.
[0036]
Therefore, the workpiece can be freely mounted on the outer periphery of the die mold during non-press drilling, and the inner surface stepped groove surface of the workpiece can be formed on the outer surface of the convex step portion of the die mold when necessary press drilling. It can be pressed and fixed and punched by a press, and after the press drilling, the workpiece is held in a loosely fitted state on the outer periphery of the die, so that it can be easily detached from the die. As a result, a series of steps from mounting / free fitting of the workpiece to the outer periphery of the die die to removal / attachment of the workpiece from the die die can be smoothly performed, and thus automation can be easily performed.
[0037]
Further, in the press punching device for a cylindrical workpiece having an inner stepped groove according to the present invention, the inner side stepped groove surface of the workpiece is pressed and fixed to the outer surface of the convex step portion of the die mold during press drilling. Then, since the punching is performed by the press, the non-processed member is not deformed by the processing stress, the dimensional accuracy of the drilling is good, the reproducibility of the drilling is high, and the press drilling can be performed. In addition, unlike drilling, there is no occurrence of back burrs, and the use of cutting oil is not required, so that clean work is possible.
[0038]
In addition, since the press punching device for a cylindrical workpiece having an inner stepped groove according to the present invention has a relatively simple configuration, the manufacturing cost can be reduced, and power saving, energy saving, and weight reduction are possible. Become.
[Brief description of the drawings]
FIG. 1A to FIG. 1C illustrate a stepped cylindrical part having a stepped groove on the inner surface.
FIG. 2 is a diagram for explaining a conventional method of making a hole in a cylindrical member by pressing.
FIG. 3 is a perspective view of an embodiment of a press drilling device for a cylindrical workpiece having inner side stepped grooves according to the present invention.
4A is a vertical cross-sectional view of the main part of the press drilling apparatus shown in FIG. 3, and FIG. 4B is a horizontal cross-sectional view of the main part of FIG.
5 is a longitudinal sectional view of an essential part for explaining a step of making a hole by press working on the right side of a wall portion having a stepped groove of a workpiece using the press drilling device of FIG. 3;
6 is a longitudinal sectional view of an essential part for explaining a step of making a hole by press working on the left side of a wall portion having a stepped groove of a workpiece using the press drilling device of FIG. 3;
7 (a) to 7 (c) illustrate a process of making a hole by press working on the right side of a wall portion having a stepped groove of a workpiece using the press drilling apparatus of FIG. FIG.
FIG. 8 (a) is a perspective view of a second embodiment of a press punching device for a cylindrical workpiece having inner side stepped grooves according to the present invention, and FIG. It is a principal part cross-sectional view.
9 is a longitudinal sectional view of a main part showing a state in which a workpiece is mounted on the outer peripheral portion of a die mold and loosely fitted in the press drilling apparatus shown in FIG. 8;
10 is a longitudinal sectional view of an essential part for explaining a step of making a hole by press working on the right side of a wall portion having a stepped groove of a workpiece using the press drilling device of FIG. 8;
11 is a longitudinal sectional view of a main part for explaining a step of making a hole by press working on the left side of a wall portion having a stepped groove of a workpiece using the press drilling device of FIG. 8;
[Explanation of symbols]
A Processing table B Support base S Column C1, C2 Ceiling panel W Workpiece member Wg Stepped groove portion 1-1, 1-2, 1-3 Hole-shaped cylindrical part 1a, 1b, 1c Stepped groove 2a, 2b, 2c Through-hole 11 Die mold 11a Flange 11b Protrusion 11c, 11d Through-hole 12 Air press machine 12a for drilling Piston shaft 12b End mounting plate 12c Punch 13 Workpiece pressing mechanism 14 Die-type pressing mechanism 14a Clamp 14b Clamp cylinder 14c Fitting recess 15a Workpiece member pressing plate 15b Bolt 15c Spring 15d Recess 15e Through hole 30 Workpiece member guide mechanism 30a Workpiece member guide jig 30a-1 Through hole 30a-2 Inner flange 30a-3 Outside Direction flange 30b-1, 30b-2 cover rail 30c-1, 30c-2 spring 40 guide Ingredients centering mechanism 40a pins 40b centering cylinder 40c fixed plate

Claims (5)

A convex step portion fixed on the processing table and having a shape corresponding to the inner surface shape of the press punched portion of the stepped groove provided on the inner surface of the cylindrical workpiece on the outer surface, and on the outer peripheral portion A die mold capable of loosely fitting a cylindrical workpiece, a workpiece holding mechanism for slidably holding the workpiece in a loosely fitted state on the outer periphery of the die mold, and the die mold Stepped grooves on the inner surface of the workpiece on the outer surface of the convex step of the die mold that are supported in a movable manner on the machining table in a state where they can be moved close to and away from each other Workpiece pressing mechanism that allows pressing and fixing the surface, and press punching in the wall of the inner stepped groove of the workpiece pressed against the outer surface of the die-shaped convex step Cylindrical body having inner side stepped grooves comprising a drilling mechanism Press drilling equipment. The workpiece holding mechanism and workpiece pressing mechanism are integrated as a workpiece holding / holding mechanism, and the press drilling mechanism performs press punching and pressing of the workpiece holding / pressing mechanism. A press punching device for a cylindrical body having an inner side stepped groove according to claim 1. A workpiece holding mechanism has a workpiece guide jig disposed between a workpiece to be loosely fitted on the outer periphery of a die and a workpiece holding mechanism, and the workpiece is always formed as a die. 2. A press punching device for a cylindrical body having an inner surface stepped groove according to claim 1, wherein the work member guide mechanism is biased in a direction of being held in a loosely fitted state on the outer peripheral portion of the cylindrical member. . 4. A die holding mechanism that engages with a die during a press drilling operation and prevents the die from bending and deforming due to a press punching load is provided. Press punching device for cylindrical body having inner side stepped groove as described. 5. A stepped inner surface according to any one of claims 1 to 4, wherein the workpiece holding mechanism and the workpiece holding mechanism are each provided in pairs in a linearly opposite direction around a die die. Press punching device for cylindrical body having grooves.
[0001]

Images