WO2006082956A1

WO2006082956A1 - Method and device for drilling through hole in peripheral wall of work

Info

Publication number: WO2006082956A1
Application number: PCT/JP2006/301955
Authority: WO
Inventors: Eizou Ueno
Original assignee: Eizou Ueno
Priority date: 2005-02-07
Filing date: 2006-02-06
Publication date: 2006-08-10
Also published as: JP4871254B2; JPWO2006082956A1

Abstract

A method and a device for drilling a through hole in the peripheral wall of a work capable of preventing burrs from occurring on the inner peripheral surface of the cylindrical part of the work, providing high productivity, and reducing manufacturing cost. The work (10) is positioned at a die (20), and a punch (30) projectedly formed on a cantilevered bar-like core (32) is inserted into the cylindrical part (12) of the work so as to face the portion of the inner wall surface of the work at which a through hole (70) is to be formed. Next, the punch (30) is pressurized and moved relative to the die (20) through the core (32) in a direction for punching the work by the punch (30) and the die (20), and a pressing pin (35) inserted into the work (10) from working through holes (72) formed at the peripheral wall portion in which the through hole (70) is to be formed and at its opposite portion is pressurized and moved together with the core (32) and the punch (30), and the punch (30) is driven into the peripheral wall (15) from the inside of the cylindrical part (12) to form the through hole (70). Then, a push back pin (55) is moved in the opposite direction together with the core (32) and the punch (32) until the punch (30) is extracted from the work (10).

Description

Drilling method and drilling device for through-hole in work peripheral wall

Technical field

[0001] The present invention relates to a method for drilling a through hole in a work peripheral wall in which a through hole is formed by press punching in a peripheral wall of the cylindrical part of a work having at least a part of the tubular part, and the drilling device And a work having a through hole opened by the drilling method or drilling device. The present invention also relates to a method for processing a through hole in a work peripheral wall, a processing apparatus for the method, and a work in which a through hole is processed by the processing method or a caching apparatus.

Background art

[0002] Drilling a workpiece with a drill includes cutting with a drill, punching a press, electric discharge calorie, and milling. In the case where the work has at least a part of a cylindrical part such as a pipe, the processing means can also be used to open a through hole in the peripheral wall of the cylindrical part.

However, in the case of hole caulking with a milling cutter, drill or press, burrs are generated at the hole edge, which requires time and effort for deburring. In particular, when a through-hole is opened in the peripheral wall of the cylindrical portion, burrs are generated on the inner peripheral surface of the cylindrical portion when using a drill or press punching with an outer force punch of the cylindrical portion. Some workpieces do not allow the inner part of the cylindrical part. However, when the workpiece is a relatively small part, it is difficult to remove the burrs generated inside the cylindrical portion.

For this reason, conventionally, the workpiece is a small part having a cylindrical portion and the peripheral wall is relatively thick. In order to open a small through hole in the peripheral wall, electric discharge machining has been employed. However, electrical discharge machining takes a long time and the machining cost is poor, and the machining cost cannot be reduced. Also, if a relatively large through hole is opened even with a small part, the punch is driven from the outside of the cylindrical part. And the inner glue is later removed manually. This also cannot reduce the processing cost due to poor productivity. Furthermore, when a through-hole is opened by cutting with a milling machine, it takes a long time and requires deburring on the inside. [0003] By the way, as shown in Fig. 28, there has been proposed a method for opening a through hole without causing burrs in a plate material (107b) by punching a press (see Patent Document 1).

) o

This is achieved by forming a circumferential groove 174a corresponding to the hole diameter of the through hole 170a to be punched on at least the back surface of the plate material (workpiece) (107b) by primary caulking by pressing or cutting (FIG. 28 (a)). As shown in (b), the punching punch (151a) is driven into the position corresponding to the center of the circumferential groove from the opposite side of the plate (107b) by the secondary caulking by the press, and the through hole (170a) is opened. is there. Note that 178a is scrap.

Patent Document 1: Japanese Patent Laid-Open No. 5-42330 ([0005], [0006], [0009], [0019], etc.) [0004] However, a method of opening a through-hole in the plate material described above is based on the die 151b. The punch 151a is simply pressed directly above and cannot be applied to the case where a through hole is formed in the peripheral wall of the cylindrical part of the small part.

Therefore, it is conceivable to punch with a press die (punch) on the inner side of the cylindrical part in order to prevent the generation of a chip inside the workpiece. However, in this case, a small mold that can be inserted into the inside of the cylindrical portion is required. The mold has a sufficient life and high productivity, and there has been no drilling method and apparatus therefor.

Similarly, in the case where the through holes are drilled in both of the opposing portions of the peripheral wall of the cylindrical portion of the workpiece, a suitable drilling method and apparatus therefor have been used. In particular, a suitable drilling method and apparatus capable of dealing with the case where the inner diameter of the cylindrical portion is small and the entrance force is long to the position where the through-hole should be opened have no force at all.

Disclosure of the invention

Problems to be solved by the invention

[0005] A problem to be solved with respect to a through hole drilling method and a drilling device in a work peripheral wall is that productivity is low in the conventional method and apparatus in order to open a through hole without a groove. . Moreover, there is also a point that burrs generated at the periphery of the through hole inside the cylindrical portion could not be appropriately processed.

Accordingly, an object of the present invention is to prevent a burr from occurring at least on the inner peripheral surface of the cylindrical portion, and to make a through hole in a work peripheral wall that can greatly reduce the processing cost with high productivity. And providing a drilling device. In addition, a processing method and a processing device for a through-hole in a workpiece peripheral wall that can significantly reduce the processing cost with high productivity by appropriately processing the thread generated on the inner periphery of the through-hole of the cylindrical portion. There is also to do.

Means for solving the problem

[0006] In order to achieve the above object, the present invention comprises the following arrangement.

According to one aspect of the method for drilling a through hole in a peripheral wall of a workpiece according to the present invention, a method of punching a through hole by press punching in the peripheral wall of the cylindrical portion of a workpiece having at least a part of the cylindrical portion. The workpiece is positioned on a die that comes into contact with the outer wall surface of the portion where the through-hole of the peripheral wall of the cylindrical portion is to be opened, and a punch protruding from a rod-shaped core metal held in a cantilever manner is provided. The inside of the cylindrical part is inserted into a state facing the inner wall surface of the portion where the through hole is to be opened, and the cored bar is punched between the punch and the die via the holding part of the cored bar At the same time as the pressure is moved relatively to the direction, the work through-hole provided in the part on the opposite side of the peripheral wall part where the workpiece through-hole should be opened is placed on the opposite side of the surface of the core bar from which the punch protrudes. Press pin inserted into the workpiece so as to contact the surface Are pressed and moved together with the cored bar and the punch to punch the punch into the peripheral wall from the inside of the cylindrical part to form a through hole, and the cored bar is inserted through the holding part of the cored bar. The workpiece is stripped by pushing back the punch by moving the push-back pin in contact with the cutting edge of the punch in the strip direction at the same time as moving in the strip direction opposite to the punching direction. Features.

[0007] According to another aspect of the method for drilling a through hole in a work peripheral wall according to the present invention, a press is applied to both of the opposing portions of the peripheral wall of the cylindrical part of the work having a cylindrical part at least in part. A method of punching a through hole by punching, wherein a work through hole which is a hole smaller than a through hole to be opened later is formed in a part opposite to the peripheral wall part where the through hole is to be opened at the beginning of the workpiece, The outer force of the cylindrical part is punched and punched, and the workpiece is positioned on the die that contacts the outer wall surface of the part where the through-hole should be opened at the beginning of the peripheral wall of the cylindrical part, and is held in a cantilever manner. The punch protruding from the bar-shaped cored bar is inserted into the cylindrical part so as to face the inner wall surface of the part where the through-hole should be opened first, and the cored bar is held by the cored bar. Punching between the punch and die through the part Who will be The pressing pin inserted into the workpiece so as to come into contact with the surface opposite to the surface of the core bar from which the punch protrudes from the work through hole at the same time is moved relative to the direction of pressure. By pressing and moving together with the cored bar and the punch, the punch is driven into the peripheral wall from the inside of the cylindrical part to form a through hole, and the direction of the punching through the cored bar through the holding part of the cored bar At the same time as moving in the strip direction opposite to that of the punch, by moving a push-back pin brought into contact with the end face of the punch in the strip direction, the punch is pushed back and the work force is stripped. A through hole is to be opened after the peripheral wall of the part, and is positioned on the die that abuts the outer wall surface of the part corresponding to the work through hole, and is protruded from a bar-shaped cored bar held in a cantilever manner Punch through the holes later Inserted into the inside of the cylindrical part in a state facing the inner wall surface of the part corresponding to the work through hole to be cut, and the cored bar is interposed between the punch and the die via the holding part of the cored bar. At the same time, the pressure is moved in the direction in which punching is performed, and at the same time, the inside of the workpiece is brought into contact with the surface opposite to the surface of the core metal from which the punch protrudes from the through-hole formed in the previous process. The pressure pin inserted into the pressure bar is moved together with the cored bar and the punch so that the punch is driven into the peripheral wall from the inside of the cylindrical portion to form a through hole including the working through hole, The mandrel is moved in the strip direction opposite to the punching direction via the mandrel holding part, and at the same time, the push-back pin abutted on the end face of the punch is moved in the strip direction. This pushes the punch back Characterized in that it flops.

[0008] Further, according to one embodiment of the method for drilling a through hole in the work peripheral wall according to the present invention, the push-back pin adjacent from the drilling position where the through hole is drilled by the die and the punch. The die and the push-back pin are moved relative to the punch and the workpiece to the strip position where the punch is disposed, and the punch is subjected to a work force strip by the push-back pin.

[0009] According to one embodiment of the device for drilling a through-hole in a work peripheral wall according to the present invention, a through-hole is formed by press punching in the peripheral wall of the tubular portion of the work having at least a part of the tubular portion. And a die that contacts the outer wall surface of the portion where the through hole of the peripheral wall of the cylindrical portion is to be opened, and a rod-shaped core metal held in a cantilever manner, and the through hole is not opened. The punch is inserted from the punch inserted into the cylindrical portion so as to face the inner wall surface of the portion to be formed, and the work through hole provided in the portion on the opposite side of the peripheral wall portion to open the through hole of the workpiece. The pressing pin inserted into the workpiece so as to abut the surface opposite to the surface of the protruding cored bar, and the cored bar is punched between the punch and the die via the cored bar holding part. At the same time, the punch is driven into the peripheral wall from the inside of the tubular portion by punching the punch pin from the inside by punching and moving the pressing pin together with the core metal and the punch. Pressurizing means for stripping the punch from the workpiece, a push-back pin abutted against the end face of the punch, and the core bar opposite to the direction of punching through the core bar holding portion. While moving in the strip direction, And the serial push back the pin pushing back the punch by moving to the strip direction, characterized in that and means push back to the work force Sutoritsu flop.

Further, according to another embodiment of the device for drilling a through hole in the work peripheral wall according to the present invention, both of the opposing parts of the peripheral wall of the cylindrical part of the work having at least a part of the cylindrical part are press punched. A through hole for working, which is a hole smaller than the through hole to be opened later, on the opposite side of the peripheral wall portion where the through hole is to be opened at the beginning of the workpiece, A first drilling device unit provided with a punch that is punched from the outside of the cylindrical portion, a die that abuts the outer wall surface of the portion where the through-hole of the peripheral wall of the cylindrical portion is to be opened, and cantilevered A punch that is inserted into the cylindrical portion so as to face an inner wall surface of a portion that is to be protruded from the bar-shaped cored bar and through which the through-hole is to be opened, and the working through-hole or the drilled through-hole The surface of the metal core with a punch A pressing pin that is inserted into the workpiece so as to abut against the opposite surface, and the cored bar is relatively pressed in a direction in which punching is performed between the punch and the die via a holding part of the cored bar. A pressing means for punching a punch into the peripheral wall from the inside of the cylindrical portion by punching the punch pin together with the cored bar and the punch by simultaneously moving the pressing pin and the punch, and the punch When the work force is stripped, the push-back pin abutted against the end face of the punch and the cored bar are moved in a stripping direction opposite to the direction of punching through the holding part of the cored bar. At the same time, the second drilling hole is provided with push-back means for moving the push-back pin in the strip direction to push the punch back and strip it from the workpiece. And an apparatus unit.

[0011] Further, according to one form of the through-hole drilling device in the work peripheral wall according to the present invention, the push-back pin is adjacent to the drilling position where the through-hole is drilled by the die and the punch. And a moving means for moving the die and the push-back pin relative to the punch and the workpiece from the drilling position to the strip position. it can.

Moreover, according to one form of the drilling device of the through-hole in the workpiece | work surrounding wall concerning this invention, the said metal core is a holding | maintenance part of this metal core on the back end side on the opposite side to the front end side where the punch was protrudingly provided. It is characterized by being inserted into a holding hole of a cored bar holder and fixed detachably.

[0012] According to one embodiment of the device for drilling a through hole in the work peripheral wall according to the present invention, the cutting edge end surface of the punch is chamfered along the shape of the inner peripheral surface of the cylindrical portion. V.

Further, according to one embodiment of the through-hole drilling device in the work peripheral wall according to the present invention, when the through-hole is drilled, the punched hole that opens the through-hole is used as the die-cutting hole discharge hole. Force A suction means for sucking and removing may be provided.

Further, according to one embodiment of the through-hole drilling device in the work peripheral wall according to the present invention, the first drilling device unit drives the punch through the outside force of the cylindrical portion of the work. It is provided to be inserted into the cylindrical part of the work to prevent the punched residue from rotating and remaining in a state where the inner peripheral edge of the work through hole is not separated. It is possible to provide an insertion member for preventing the extracted dregs from rotating.

[0013] In addition, according to one embodiment of the workpiece that works according to the present invention, the workpiece has a cylindrical portion at least in part, and the peripheral wall of the cylindrical portion is formed by the through-hole drilling device in the peripheral wall of the workpiece. A through hole is opened at the top.

[0014] Further, according to one embodiment of the method for processing a through hole in the work peripheral wall according to the present invention, both of the opposing portions of the peripheral wall of the cylindrical part of the work having at least a part of the cylindrical part, About the through-hole drilled and punched from the outside, the through-hole A processing method for pressing a burr generated on an inner peripheral edge, wherein the workpiece is positioned on a receiving die that abuts an outer wall surface of a portion where a through-hole is formed in a peripheral wall of the cylindrical portion, and cantilevered. A surface pressing punch protruding from a held bar-shaped cored bar is inserted inside the cylindrical part so as to face the portion where the through hole is opened, and the cored bar is held by the cored bar. A surface pressing side on the peripheral wall of the cylindrical portion of the workpiece, and a side where the surface pressing force is moved between the surface pressing punch and the receiving die through a portion. From the opposite through hole, a pressing pin inserted into the workpiece so as to abut the surface opposite to the surface of the core metal from which the surface pressing punch protrudes is added together with the core metal and the surface pressing punch. The burrs generated on the inner peripheral edge of the through hole are It is characterized in that the inner force of the cylindrical part is also pressed and crushed by a surface pressing punch.

[0015] Further, according to one form of the processing device for a through hole in the work peripheral wall according to the present invention, both of the opposing portions of the peripheral wall of the cylindrical part of the work having at least a part of the cylindrical part are provided. A processing device that presses a burr generated on the inner peripheral edge of a through-hole that has been punched from the outside and is drilled, and is a portion in which a through-hole is formed in the peripheral wall of the cylindrical portion A surface that is inserted into the inner side of the cylindrical portion so as to face the portion where the through-hole is formed, protruding from a receiving die that abuts against the outer wall surface of the rod and a bar-shaped cored bar held in a cantilever manner The pressing punch and the surface opposite to the surface of the core metal from which the surface pressing punch protrudes from the through hole opposite to the side where the surface pressing is performed on the peripheral wall of the cylindrical portion of the workpiece so as to abut the surface. A pressing pin to be inserted into the workpiece and the cored bar The pressing pin is moved together with the metal core and the surface pressing punch at the same time as the surface pressing punch and the receiving die are pressed and moved relative to each other through the holding portion. And a pressing means for pressing and crushing the burrs generated at the inner peripheral edge of the through-hole by pressing the inner force of the cylindrical portion with the surface pressing punch. According to the embodiment of the processing device for the through hole in the work peripheral wall according to the present invention, the surface pressing punch is in contact with the tip guide portion that can enter the through hole and the inner peripheral edge of the through hole. It is characterized in that it is provided with a surface pressing R portion provided in a cross-sectional R shape, which is a portion to crush.

[0016] In addition, according to one embodiment of the workpiece that works on the present invention, the cylindrical portion is at least partially included. It is a workpiece | work, Comprising: The through-hole provided in the surrounding wall of a cylindrical part was processed by the processing apparatus of the through-hole in the said workpiece surrounding wall, It can be characterized by the above-mentioned.

The invention's effect

[0017] According to the drilling method and drilling device for the through hole in the work peripheral wall according to the present invention, at least the inner peripheral surface of the cylindrical portion is prevented from being formed, and the productivity is improved. Machining costs can be greatly reduced. The present invention can also be suitably applied to a case where a through hole is formed at a position away from the opening force of the cylindrical portion.

Brief Description of Drawings

FIG. 1 is a side view showing one embodiment of a drilling device according to the present invention.

FIG. 2 is a side view showing a drilling process in a state where a workpiece is set.

FIG. 3 is a side view showing a drilling process in a state where the pressing pin is lowered.

FIG. 4 is a front view of FIG.

FIG. 5 is a side view showing a drilling process in a state where a work is brought into contact with a die.

FIG. 6 is a front view of FIG.

FIG. 7 is a side view showing a process of punching a through hole with a punch.

FIG. 8 is a front view of FIG.

FIG. 9 is a front view showing the strip process in a state where the pressing pin is raised.

FIG. 10 is a front view showing a strip process in a state where a workpiece is raised.

FIG. 11 is a front view showing a strip process in a state where a die is slid.

FIG. 12 is a front view showing a process of stripping a punch with a work force.

FIG. 13 is a side view showing an embodiment of a drilling device for drilling a working through hole.

FIG. 14 is a side view showing a step of drilling a working through hole in one side wall of the workpiece.

FIG. 15 is a side view showing a state in which a workpiece is reset on the drilling device of FIG.

FIG. 16 is a side view showing a step of drilling a working through hole in the other side wall of the workpiece.

FIG. 17 is a front view and a bottom view showing one embodiment of a punch.

FIG. 18 is a cross-sectional view showing one embodiment of a negative pressure suction device.

FIG. 19 is a cross-sectional view schematically illustrating the form of a punch.

FIG. 20 is a side view showing one embodiment of an insertion member for preventing the rotation of the extracted residue. 21] A side view of a cross section showing one embodiment of a processing apparatus according to the present invention.

圆 22] It is a side view showing a state in which the work is set and the pressing pin is lowered.

FIG. 23 is a front view showing the main part of FIG.

[24] FIG. 24 is a side view showing a state where the surface pressing punch presses the inner periphery of the through hole.

FIG. 25 is a front view of FIG. 24.

[26] FIG. 26 is a side view showing an embodiment of an apparatus for drilling a through-hole with an external force in a workpiece.

FIG. 27 is a side view showing a step of drilling a through hole with the apparatus of FIG. 26.

圆 28] An explanatory diagram for explaining a conventional drilling device.

Explanation of symbols

10 work

12 Tube

15 wall

16 Work table

20 dies

24 discharge hole

30 punches

30a Cutting edge

30b Chamfer

32 cored bar

35 Press pin

37 punch

40 Lifting block

42 Holding hole

50 Pressurizing means

51 Return means

53 Return panel

55 Push-back pin

56 Push-back pin drive means 57 Core metal drive means

58 Cylinder unit

60 Suction means

62 Compressed air source

70 Through hole

72 Work through hole

80 Unplug

82 Unplug

100 First drilling device unit

110 work pieces

120 Die

130 face punch

132 Core

135 Press pin

170 Through hole

171 Inner edge

200 Second drilling device unit

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an example of the best mode of a through hole drilling method and a drilling device in a work peripheral wall according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a punching device and a workpiece according to the present invention, as seen from a side force. This drilling device is a device that punches a through hole in the peripheral wall of the cylindrical portion of the work by press punching from the inside.

Reference numeral 10 denotes a workpiece, which is an example having a cylindrical portion 12 at least partially. As shown in Fig. 1, one side (left side in the drawing) has an opening 10a, the axial middle portion 10b is formed thicker than the portion on the opening side, and the other side (right side in the drawing) gradually decreases in diameter. It has become. The inner diameter of the intermediate part 10b is larger than that of the opening side. The other side of the workpiece 10 has a slightly through hole at the center, but has a substantially closed shape.

This workpiece 10 is specifically an automobile handle shaft, and is formed of a metal material. It has been done. The part where the through hole is to be opened (intermediate part 10b) has an outer diameter of about 25 mm and a thickness of the peripheral wall 15 of about 2.5 mm. An oblong through hole 70 with a major axis of 27mm x minor axis of 9mm (see Fig. 12) is drilled on the front and back (each half of the circumference) at a predetermined position in the axial direction of the intermediate part 10b. . In this work 10, two through holes 72 for work are opened in advance above and below the intermediate part 10b.

[0021] Reference numeral 20 denotes a die, which is one mold for machining the workpiece 10. The die 20 is formed so as to suitably receive the workpiece 10 so as to come into contact with the outer wall surface of the portion where the through hole 70 of the peripheral wall 15 of the cylindrical portion 12 is to be opened. As shown in FIG. 4, it is formed in an arc shape in cross section, and the corner portion that becomes the cutting edge is formed in an obtuse angle, so that it is difficult to damage.

Reference numeral 24 denotes a discharge hole for the punched residue, which is gradually enlarged downward (Fig. 1, 4 etc.). As a result, the drainage residue 80 (FIGS. 7 and 8, etc.) is suitably discharged without being caught on the way.

[0022] Reference numeral 30 denotes a punch, which is provided at a tip side portion of a rod-shaped cored bar 32 held in a cantilever manner. The punch 30 projects in a direction perpendicular to the longitudinal direction (axial center) of the core metal 32 and directly below. Further, the punch 30 is provided in a shape that protrudes as short as possible so that the core metal force can be obtained. The reason for forming the punch 30 short in this way is to increase the life of the mold by forming the core metal 32 thickly. That is, since the punch 30 is short, the escape stroke can be shortened, and the core metal 32 inserted into the work 10 can be thickened accordingly. Therefore, the strength can be increased and the life can be extended. Moreover, since the punch 30 is short, damage to the punch 30 itself can be prevented. Thereby, productivity can be improved and processing cost can be reduced significantly.

In the present embodiment, the punch 30 and the cored bar 32 are integrally formed. However, in some cases, the punch 30 is formed in a shape protruding from the core metal 32 by a predetermined length by embedding and fixing the punch 30 formed separately in the tip side portion of the core metal 32. Further, as shown in FIG. 2, the punch 30 is inserted into the cylindrical portion 12 so as to face the inner wall surface of the portion where the through hole 70 is to be opened. Note that the punch 30 is also relatively inserted into the cylindrical portion 12 by transporting the workpiece 10 with the feeder and fitting it onto the cored bar 32 provided with the punch 30. The metal core 32 has a holding hole 42 of a metal core holder (elevating block 40) whose rear end side 32 b opposite to the front end side 32 a on which the punch 30 protrudes is a holding part of the metal core 32. It is inserted in the horizontal direction and fixed to the lifting block 40 so as to be detachable. Further, a flat portion for preventing rotation is provided on the side surface of the rear end side 32 b of the cored bar 32. For this reason, it can be exchanged suitably and easily.

The fixed state of the metal core 32 is a cantilever in which the distal end side 32a protrudes in the horizontal direction, and the metal core 32 is formed in a rod shape as described above. In this embodiment, the partial force with which the core metal 32 is held by the elevating block 40 is also very long to the portion where the punch 30 is provided. For this reason, when press punching is performed, if there is no means for pressing the distal end side 32a side of the core metal 32 (for example, a pressing pin 35 described later), the core metal 32 is pinched and the through hole 70 is formed. Cannot be drilled. Further, the longer the protruding portion of the cored bar 32, the greater the moment is applied and the easier it is to break.

The shape of the cored bar 32 may be any shape as long as the distal end side 32a can be inserted inside the workpiece 10. In particular, the shape of the rear end portion 32b is not limited and may be appropriately formed as long as it can be suitably set.

[0024] 35 is a pressing pin, which is on the opposite side to the surface of the core bar on which the punch 30 is projected from the working through hole 72 provided on the opposite side of the peripheral wall portion where the through hole 70 of the workpiece is to be opened. Is inserted into the workpiece 10 so as to abut the surface 33 of the workpiece 10.

The pressing pin 35 is pressed and moved together with the cored bar 32 and the punch 30 as will be described later. According to this, the pressing pin 35 is in a state of supporting the core metal 32 with the upper force, and as a result, the punch 30 can be pressed and the through hole 70 can be formed. That is, the metal core 32 can be pressed from above with both the elevating block 40 and the pressing pin 35, and the punch 30 can be driven into the peripheral wall 15 from the inside.

According to this, it is possible to prevent the moment when the cored bar 32 is cantilevered, to allow the through hole 70 to be drilled, and to suitably prevent the cored bar 32 and the punch 30 from being damaged. . Since the through hole 70 can be suitably opened from the inside by press punching in this way, it is possible to prevent burrs from being generated inside the workpiece 10. Also, productivity can be significantly improved by eliminating the deburring process. This can greatly reduce production costs [0025] P (50) is a pressurizing means, and a direction in which the core metal 32 is punched between the punch 30 and the die 20 through the core metal holding portion (elevating block 40) (the direction in which the core metal 32 is adjacent) ) And pressurizing and moving the pressing pin 35 together with the core metal 32 and the punch 30 at the same time (in this embodiment), the inner force of the cylindrical portion 12 is also increased. It is driven into the peripheral wall 15 of the work, and a through hole is made by causing shearing and breaking.

In this embodiment, first, the pressing pin 35 is lowered (see FIGS. 3 and 4), and the punch 30 is simultaneously lowered through the cored bar 32 held by the lifting block 40 from the middle (see FIGS. 7 and 8). It has become. Further, the punch 30 is driven downward in a direction perpendicular to the peripheral wall 15. Needless to say, the punching direction for forming the through hole 70 is not limited to the vertical direction as in this embodiment. For example, the workpiece 10 is set in a progressive die or the like with the workpiece 10 standing, and the punch 30 is driven in the horizontal direction to form the through hole 70.

As a pressurizing device for the pressurizing means 50, for example, a cylinder device may be used. In addition, in order for the fracture to be performed properly following shearing, the clearance between the die 20 and the punch 30 needs to be appropriate. This appropriate clearance is empirically appropriate. For example, when opening a circular through hole in an iron-based material, set the inner diameter of the die and the outer diameter of the punch so that the following equation is satisfied.

Die inner diameter = punch outer diameter + {Workpiece thickness X (5-10%)} X 2

[0026] Reference numeral 16 denotes a work placement table, which is supported by a plurality of support columns 52 so as to be movable up and down while the work 10 is placed and fixed. Reference numeral 18 denotes a holding member, which is fixed by sandwiching the workpiece 10 with the workpiece mounting table 16.

On the work table 16, the elevating block 40 and the elevating guide 44 for guiding the vertical movement of the elevating block 40 are placed.

Then, the work mounting table 16 is pressed and lowered together with the pressing pin 35 and the lifting block 40 by the pressing means 50 through the pressing rod 46. The workpiece 10 is set in contact with the die 20 at the position where the workpiece mounting table 16 is lowered. The workpiece mounting table 16 is configured to be held in a state where the workpiece 10 is bridged on the die 20. More specifically, a die 20 is disposed in a vertical penetrating portion 17 provided on the work table 16. This The workpiece mounting table 16 is movable up and down with respect to the die 20 by a predetermined distance.

Reference numeral 53 denotes a return panel, which is arranged in each of a plurality of storage chambers 43 a provided in the base board 43. The strut 52 is urged to protrude upward by the spring of the return panel 53. According to the return panel 53, the work mounting table 16 lowered by the pressurizing means 50 can be returned to the original height position through the support column 52. As the return panel 53, a coil spring can be used as shown in FIG.

[0028] Reference numeral 51 denotes a return means, which acts to raise the push plate 45 lowered by the pressurizing means 50 and return it to the top dead center. For example, a coil spring can be used. By this return means 51, the push portion 45 a, the push rod 46 and the push pin 35 that come into contact with and press against the elevating block 40 can be raised and returned to the pre-pressurization position via the push plate 45.

Reference numeral 55 denotes a push-back pin, which is brought into contact with the cutting edge 30a of the punch in order to strip the punch 20 from the workpiece 10.

Reference numeral 57 denotes a cored bar drive means, which moves the cored bar 32 in the strip direction opposite to the punching direction via the cored bar holding part (elevating block 40). As the mandrel driving means 57, a cylinder device can be used as shown in FIG. The mandrel driving means 57 is fixed to the workpiece mounting table 16 and moves up and down together with the workpiece mounting table 16.

Reference numeral 56 denotes a drive means for the push-back pin. At the same time as the lifting block 40 is moved in the strip direction opposite to the punching direction, the push-back pin 55 is moved together with the core metal 32 and the punch 30 in the strip direction opposite to the punching direction. As the push-back pin driving means 56, a cylinder device can be used as shown in FIG. 1 or the like in order to suitably synchronize with the mandrel driving means 57. It can be easily synchronized by adjusting the driving pressure of each cylinder device.

In the present embodiment, the core metal 32 and the push-back pin 55 that push the punch 30 back and strip it from the workpiece 10 are moved under pressure by the core-bar driving means 57 and the push-back pin driving means 56 comprising the cylinder device. A pressurizing return means (push-back means) is constructed. It is. Of course, the push-back means may be a mechanism having other known actuators as constituent elements, not limited to this.

In the present embodiment, as shown in FIGS. 4 and 11, a strip in which a push-back pin 55 is disposed adjacent to a drilling position A where the through hole 70 is drilled by the die 20 and the punch 30 is provided. Position B is provided.

A moving means for moving the die 20 and the push-back pin 55 relative to the punch 30 and the workpiece 10 relative to the punching position A force to the strip position B is also provided. A cylinder device 58 can be used as the horizontal drive unit of the moving means as shown in FIGS. Further, the above-described return panel 53 functions as the vertical drive unit of the moving means.

In addition, as shown in FIGS. 17 and 19 (description on the right half), the end surface serving as the cutting edge of the punch 30 of the present embodiment conforms to the shape of the inner peripheral surface of the cylindrical portion 12 of the workpiece 10. (FIG. 17 (a) is a front view of the punch 30, and FIG. 17 (b) is a bottom view of the punch 30).

In the present embodiment, the left and right portions of the punch 30 are chamfered corresponding to the inner circumferential surface of the cylindrical portion 12, and two chamfered portions 30b are formed. That is, as is apparent from the description of the right half of FIGS. 17 and 19, chamfered portions 30 b that are inclined with respect to the flat end surface 30 a perpendicular to the driving direction of the punch 30 are formed on both sides of the punch 30. ing. Thus, the obtuse angle is greater than the angular force of 90 ° at each corner on the end face of the punch 30 in which the chamfered portion 30b is formed. Note that the inclined surfaces of the flat end surface 30a and the chamfered portion 30b are parallel to the axis of the cored bar 32.

By forming the chamfered portion 30b in this manner, the end surface of the punch 30 can be dispersedly brought into contact with the inner peripheral surface of the cylindrical portion 12, and the punch 30 can be prevented from being damaged. Similar to the cutting of the scissors, the presence of the chamfered portion 30b of the punch 30 causes a corner, which can disperse the pressure during pressing and open the through hole 70 suitably. Further, since the corner portion is an obtuse angle, the chipping of the punch 30 is unlikely to occur.

Further, as clearly shown in the description of the right half of FIG. 19, the tip side 32a of the core metal 32 provided with the punch 30 is thickened corresponding to the height H3 of the chamfered portion 30b formed and cut. Even so, it can be inserted inside the workpiece 10. The cross-sectional area of the tip side 32a of the core metal 32 is wide. As a result, the rigidity and durability of the core metal 32 can be increased. Note that the description on the left half of FIG. 19 is a cross-sectional view illustrating the case where the chamfered portion 30b is not formed. This also extends the life of the mold and can reduce the processing cost.

In addition, according to the punch 30 having the chamfered portion 30b on the end surface, it is possible to prevent the punched residue 80 from sticking and sticking to the end surface of the punch 30. This also improves productivity.

[0032] V (60) is a suction means (Fig. 4), and when the through-hole 70 (Fig. 8) is drilled, a punching piece 80 (Fig. 8) that opens the through-hole 70 is inserted into the die 20. According to this, suction is removed from the discharge hole 24 of the extracted waste. According to this, the suction residue is generated when the removed residue 80 is generated, and the suction residue is removed at the moment when the removed residue 80 is generated. 80 can be suitably opened without remaining. As the suction means 60, as shown in FIG. 18, a negative pressure suction device that generates a negative pressure by a bench lily effect by opening the compressed air from the compressed air source 62 to the flow path 64 having a larger sectional area. It can be suitably used. A negative pressure state is maintained in a normal state, and suction can be suitably performed when a drawn residue 80 is generated. Note that the extracted residue 80 sucked into the flow path 64 through the discharge hole 24 is blown away by the air flow (discharged air flow) flowing through the flow path 64. Therefore, it is possible to suitably discharge the extraction waste 80 without adding a special configuration to the suction means 60.

According to the method using compressed air, it can be easily configured by using a compressor device generally used in a normal factory. Of course, the suction means is not limited to this, and other decompression (vacuum) devices may be used.

[0033] With the through hole drilling device in the work peripheral wall described above, for the work 10 having at least a part of the cylindrical part 12, the through hole 70 is opened from the inside in the peripheral wall 15 of the cylindrical part 12. Can be verified by examining the state of shearing and breaking.

Next, a process of drilling the through hole 70 in the peripheral wall 15 of the cylindrical portion 12 of the workpiece 10 using the drilling apparatus having the above-described structural force will be described with reference to FIGS. 1 to 3, 5 and 7 are side sectional views, and FIGS. 4, 6 and 8 to 12 are front sectional views. In each figure, the configuration described above is denoted by the same reference numeral, and detailed description thereof is omitted. FIG. 1 shows a state where the mold before the work 10 is set in the mold is opened.

Reference numeral 45 denotes a push board, which is pressed by the pressurizing means 50 (FIG. 1). Two push pins 35 are attached to the press plate 45. In addition, a push bar 46 is disposed between the push portion 45 a that pushes the lifting block 40 of the push board 45 and the push pin 35. The push bar 46 is always urged so as to protrude downward by the panel 47, and acts to push the work mounting table 16 downward when lowered with the push plate 45.

FIG. 2 is a cross-sectional view showing a state in which the workpiece 10 is set in a mold. The workpiece 10 is fixed by being sandwiched between holding members 18 on a workpiece mounting table 16. More specifically, as shown in FIG. 4, the workpiece 10 is fitted into a U-shaped groove provided on the workpiece mounting table 16, and the workpiece 10 is brought into contact with the arcuate surface of the holding member 18 from above. It is fixed.

At this time, the workpiece 10 is positioned above the die 20 at a predetermined interval. In addition, the punch 30 protruding from the rod-shaped cored bar 32 held in a cantilever manner is inserted into the cylindrical portion 12 so as to face the inner wall surface of the portion where the through hole 70 is to be opened. It is.

At this time, the push plate 45 is at the top dead center, and the push pin 35 is located above the workpiece 10. Further, the pushing portion 45a is also located above the lifting block 40. Further, the push rod 46 is also located above the workpiece mounting table 16.

Next, as shown in FIGS. 3 and 4, the push plate 45 is lowered, and the pushing portion 45 a is brought into contact with the upper surface of the elevating block 40. At the same time, the pressing pin 35 is also inserted into the work 10 from the work through hole 72 (FIG. 2), and is brought into contact with the surface 33 opposite to the surface of the core bar from which the punch 30 is projected. Further, as shown in FIG. 4, the push bar 46 is in contact with the upper surface of the work table 16.

[0037] Then, as shown in FIGS. 5 and 6, when the push plate 45 is further lowered, the work placement table 16 is lowered by being pushed by the push bar 46. The workpiece mounting table 16 is pressed downward against the urging force of the return panel 53 that urges the column 52 upward.

As a result, the workpiece 10 is lowered together with the lifting block 40, the cored bar 32 and the punch 30 placed on the workpiece placing table 16.

As a result, the outer wall surface of the portion where the through hole 70 of the peripheral wall 15 of the cylindrical portion should be opened is The workpiece 10 is positioned in contact with the workpiece.

Then, as shown in FIGS. 7 and 8, the push plate 45 is further lowered to press the elevating block 40, and the cored bar 32 is punched through the elevating block 40 which is a holding part of the cored bar. From the work through hole 72 provided on the opposite side of the peripheral wall part where the work through hole 70 is to be opened, at the same time the pressure is moved in the direction in which punching is performed between the die 30 and the die 20. The pressing pin 35 inserted so as to come into contact with the surface 33 opposite to the surface of the core bar from which the punch 30 is projected is pressed and moved together with the core metal 32 and the punch 30 so that the punch 30 is moved to the cylindrical portion. The inner force of 12 is also driven into the peripheral wall 15 to pierce the through hole 70.

At this time, the elevating block 40 is guided by the elevating guide 44 and slides downward by a predetermined interval such that the punch 30 punches the peripheral wall 15.

When the punch 30 is driven as shown in FIG. 8, the through-hole 70 can be suitably opened by the cutting edge end surface 30a of the punch 30 in which the chamfered portion 30b is formed. This is because the four corner forces formed by the chamfered portion 30b first come into contact with the inner wall surfaces of the peripheral wall 15, and the shear angle is generated as described above.

At this time, the push bar 46 moves upward against the urging force of the panel 47 and enters the holding hole 48 for a predetermined length.

Further, when the through-hole 70 is drilled as described above, the extraction residue 80 may be removed by suction from the discharge hole 24 of the extraction residue of the die 20 by the suction means 60. As a result, the through-hole 70 is suitably opened, and the punched-out residue 80 can be reliably discharged, thereby improving productivity.

Next, a process of stripping the punch 30 from the workpiece 10 will be described with reference to FIGS.

As shown in FIG. 9, the press plate 45 is raised by the lifting force of the return means 51 (FIG. 1) so that the pressing pin 35 is moved upward by a predetermined interval.

At this time, the cylinder device (FIG. 1), which is the core bar driving means 57, functions to prevent the core bar 32 from rising and maintain the punch 30 penetrating the peripheral wall 15 of the workpiece 10. . Further, as shown in FIG. 10, when the push plate 45 is further raised by the lifting force of the return means 51 (FIG. 1), the workpiece mounting table 16 is raised to a predetermined height as the push bar 46 is raised. As the push plate 45 is raised, the pressing force of the push bar 46 is released, and the return panel 53 Then, the work mounting table 16 is raised through the support column 52. As a result, the workpiece 10 is in a state where the die 20 is lifted by a predetermined distance, and can be moved left and right.

Next, as shown in FIG. 11, the punch is moved from the drilling position A where the through hole 70 is drilled by the die 20 and the punch 30 to the strip position B where the push-back pin 55 is disposed adjacently. The die 20 and the push-back pin 55 are moved relative to 30 and the workpiece 10.

As shown in FIG. 11, the cylinder device 58, which is the horizontal drive unit of the moving means, contracts, and the die block including the die 20 and the push-back pin 55 is slid in the horizontal direction (right side in the drawing). In this embodiment, the push-back pin driving means 56 (cylinder device) does not move, and the rear end of the push-back pin 55 slides on a board provided on the telescopic rod of the cylinder device.

As a result, the tip force of the push-back pin 55 is positioned directly below the cutting edge 30a of the punch 30.

Then, as shown in FIG. 12, the push-back pin 55 is raised by the push-back pin drive device 56. The push-back pin 55 contacts the cutting edge surface 30a of the punch 30 and pushes up the punch 30 with a downward force. At this time, the cored bar driving means 57 (FIG. 1) is also operated simultaneously to raise the cored bar 32 through the lifting block 40 (FIG. 1). As a result, the cored bar 32 on which the punch 30 is protruded is raised to a predetermined height while being kept horizontal.

By the above operation, the punch 30 is suitably stripped from the workpiece 10.

In this embodiment, the drilling position A and the strip position B are provided separately, but both the drilling and stripping processes may be performed at the same position. If the dimensional constraints can be cleared, the pulling force 80 may be discharged to the side as well as the force directly below the die 20, and the push-back pin 55 may be pulled out and pushed up from the lower side through the waste discharge hole 24. In other words, the pressing pin 35, the punch 30, the die 20 and the push-back pin 55 may be arranged in a substantially straight line up and down. According to this, the drilling process and the stripping process can be performed at the same position on the workpiece 10. Therefore, a complicated moving mechanism for moving the workpiece 10 relatively to the drilling position A and the strip position B is not required.

[0043] After the steps described above, in order to drill the through hole 70 on the opposite side by 180 degrees, the already opened through hole 70 may be used, and press punching may be performed using the pressing pin 35. . In addition, work The business process is the same as described above, and the description is omitted.

According to the above process, since the punch 30 is driven from the inside and the through hole 70 is opened, the inner wall surface of the cylindrical portion 12 does not have a groove. Therefore, it is not necessary to perform deburring work in the subsequent process. In addition, since the punch 30 is also pressed by the pressing pin 35, a pressing pressure can be suitably applied, and a relatively large through hole can be suitably opened. The cored bar 32 is supported by the ascending / descending block 40 and the pressing pin 35, so that it is possible to prevent the stagnation deformation that occurs when it is cantilevered. Therefore, damage to the punch 30 and the core metal 32 can be prevented, and the life of the mold can be greatly extended.

Further, the punch 30 can be suitably stripped from the workpiece 10 by pushing back the punch 30 with the push-back pin 55. This is because the punch 30 can be prevented from being tilted by pushing the punch 30 in synchronism with the rise of the core metal 32 by the push-back pin 55. That is, the punch 30 can be prevented from biting into the through hole 70 of the workpiece 10, and the punch 30 can be smoothly stripped from the workpiece 10.

For this reason, productivity can be improved and processing cost can be reduced significantly.

Next, a method and apparatus for drilling the working through hole 72 in the peripheral wall 15 of the workpiece 10 will be described with reference to FIGS.

The apparatus shown in the figure is a punch for punching a work through-hole 72, which is a hole smaller than the through-hole 70 to be opened, from the outside of the cylindrical portion in the peripheral wall portion where the through-hole 70 of the work 10 is to be opened. 37. This device is the first drilling device unit 100.

Then, with respect to the first drilling device unit 100, the device described in FIGS. 1 to 12 becomes the second drilling device unit 200.

[0045] Reference numeral 23 denotes a receiving portion, which is a portion that receives the cylindrical portion 12 on which the workpiece 10 is processed. Reference numeral 25 denotes a stopper, which is a portion that abuts on the end face of the workpiece 10 on the opening 10a side for positioning. Reference numeral 28 denotes a fixed piece, and the workpiece 10 is fixed to the receiving portion 23 by the fixed piece 28 and the screw 29.

Reference numeral 90 denotes a push board, which is pressed by the pressurizing means 91. Two pin-like punches 37 (circular cross-section) are attached to the press 90.

26 is a stripper section that holds the workpiece 10 when the punch 37 is removed from the workpiece 10. It has become minutes. The stripper portion 26 is provided with two guide holes 38 so that the punch 37 can slide up and down.

Reference numeral 92 denotes a positioning pin which is urged so as to protrude upward by the urging force of the panel 93. The work 10 is fitted in the previously drilled through hole 72 and positioned in the rotational direction of the workpiece 10.

Next, a process of drilling the working through hole 72 in the peripheral wall 15 of the cylindrical portion 12 of the workpiece 10 using the first drilling device unit 100 having the above-described structural force will be described with reference to FIGS. Based on this explanation. Figures 13 to 16 are all cross-sectional views of the lateral force.

FIG. 13 is a cross-sectional view showing a state in which the workpiece 10 is set in a mold. At this time, the press plate 90 is at the top dead center, and the punch 37 is located apart upward. It should be noted that the pressurizing means and the returning means applied to the push plate 90 are not particularly described as long as a known technique as described with reference to FIG. 1 is appropriately used.

FIG. 14 is a cross-sectional view showing a state in which the punch 37 is lowered and two work through holes 72 are formed in the work 10.

The diameter of the working through hole 72 can be set to be relatively small compared to the inner diameter of the workpiece 10. It is a hole that is at least one size smaller than the through hole 70 that is finally drilled. Therefore, the working through hole 72 can be drilled without increasing the press pressure. For this reason, in this embodiment, the working through-hole 72 is formed only by driving the punch 37 from the outside without using a die. For this reason, productivity can be improved.

[0048] Although a method for discharging the extraction residue 82 is not shown, it may be appropriately discharged by blowing it away with air. Since the working through hole 72 is smaller than the through hole 70, the punched residue 82 is relatively small and can be easily discharged.

By the way, the working through hole 72 is provided as a discard hole (a lower hole) because the working through hole 72 is completely lost when the through hole 70 including the portion is formed.

Since the working through-hole 72 is provided as a discard hole, there is a case where high-precision processing is not required. In that case, the working through hole 72 may be drilled not only by the drilling method as in the present embodiment but also by other known drilling methods.

FIG. 15 shows a state in which the workpiece 10 is rotated 180 degrees and fixed to the receiving portion 23. First A positioning pin 92 is fitted into the drilled through-hole 72 for work. As a result, the workpiece 10 is securely fixed in a state of being rotated 180 degrees around the axis!

FIG. 16 is a cross-sectional view showing a state where the punch 37 is lowered and the other two work through holes 72 are formed in the work 10.

[0050] In this way, the working through hole which is a hole smaller than the through hole 70 (see FIGS. 7 and 12, etc.) to be opened later on both of the opposing portions of the peripheral wall 15 of the cylindrical portion 12 of the workpiece. 72 can be suitably drilled.

The work through-holes 72 were drilled in both parts of the circumference at two equal positions where the two through-holes 70 should finally be opened. The two front and back through-holes 70 were drilled under the same conditions. It is to do. Further, by opening the working through-hole 72 which is a discard hole, it becomes easy to deform the punched-out residue 80 in the contracting direction. For this reason, there is also an advantage that the punched residue 80 is easily discharged from the discharge hole 24 of the punched residue.

Even if the working through-hole 72 is formed on only one side where the through-hole 70 is to be opened later, the two through-holes 70 (positions corresponding to two equal circumferences) can be preferably opened. Of course you can. This is because when the second through hole 70 is opened, the previously opened through hole 70 can be used.

[0051] Further, as in the present embodiment, the workpiece 10 is an end portion of the workpiece that is an entrance into which the cored bar 32 provided with the punch 30 is inserted rather than the inner diameter of the cylindrical portion 12 provided with the through hole 70. When the inner diameter of the opening 10a is small, the first punching device unit 100 may be provided with an insertion member 95 for preventing the rotation of the punch as shown in FIG.

The insertion member 95 is inserted into the cylindrical portion 12 of the workpiece, and the outer peripheral surface 95 a is close to the inner peripheral surface of the peripheral wall 15. For this reason, when the outside force of the cylindrical portion 12 of the workpiece is also punched into the work through hole 72 by punching the punch 37, the punched residue 82 is partially separated from the inner peripheral edge 72a of the work through hole 72. However, it can be prevented from rotating (reversing) in the state and remaining. Therefore, the size (outer diameter) of the insertion member 95 is preferably provided so as not to provide a space in which the punch 82 is rotated. The insertion member 95 is preferably made of a material having appropriate flexibility and elasticity in order to suitably receive the punched residue 82. For example, a urethane rod-like material can be used. Urethane is a material with lower hardness than metal, so You can receive the punch 82 as if the punch 37 is not damaged.

[0052] Next, an example of the best mode of the method for processing a through-hole in the work peripheral wall and the caching device, which is useful in the present invention, will be described in detail with reference to the accompanying drawings (FIGS. 21 to 27).

FIG. 21 is a cross-sectional view of the processing apparatus and workpiece 110 according to the present invention, in which a side force is also shown, showing a state in which the die before the workpiece 110 is set in the die is opened. FIG. 22 is a cross-sectional view also showing a side force showing a state where the fork 110 is set in a mold and the pressing pin 135 is lowered.

In this processing apparatus, a punch 137 (see FIG. 27) is also punched into both the opposing portions of the peripheral wall 115 of the cylindrical portion of the workpiece 110 having at least a portion of the cylindrical portion 112. This is a device for press-treating the groove formed on the inner peripheral edge 171 of the through-hole 170. Further, this machining apparatus has many common configurations with the drilling apparatus shown in FIGS. 1 to 12, and the same names are given to the equivalent configurations, and the different configurations will be described in detail.

[0053] Reference numeral 120 denotes a receiving die, which abuts against the outer wall surface of a portion where the through hole 170 of the peripheral wall 115 of the cylindrical portion is opened.

Reference numeral 130 denotes a surface pressing punch, which protrudes from a bar-shaped cored bar 132 held in a cantilever manner, and is inserted inside the cylindrical portion 112 so as to face a portion where a through hole is formed. The surface pressing punch 130 may be formed integrally with the cored bar 132 as in this embodiment, or may be constituted by a plurality of parts such as a fitting type.

The surface pressing punch 130 according to the present embodiment has a tip guide portion 130a that can enter the through-hole 170 and a portion that contacts the inner peripheral edge 171 of the through-hole 170 and crushes the burr 171a (see FIG. 23 (b)). And a surface pressing R part 130b provided in a surface R shape (concave concave shape) (see FIGS. 23 to 25). Further, the tip guide portion 130a and the surface pressing R portion 130b are formed continuously. In addition, a stepped portion 130c is formed to prevent the excessive press pressure from being applied by stamping the excess portion (inner wall surface of the workpiece 110). Thereby, the surface pressing punch 130 can press and crush the groove 171a intensively and reliably.

[0054] The core bar 132 has a rear end side 132b opposite to the tip end side 132a on which the punch 130 is projected, in the holding hole 142 of the holder (lifting block 40) that holds the core bar 132 in the horizontal direction.揷 It is inserted and fixed detachably. Further, in order to improve the strength of the cored bar 132 and favorably hold it, the elevating block 140 is provided with a protruding part 140a extended in the horizontal direction so that the rear end part 132b of the cored bar is inserted. . According to this, the shape of the cored bar 132 can be made a simple rod shape, and the manufacturing cost can be reduced. The shape of the core bar 132 is not particularly limited as long as the front end side 132a can be inserted into the work 110, and the shape of the rear end portion 132b is not particularly limited. In addition, the direction of installation is not particularly limited.

[0055] Reference numeral 135 denotes a pressing pin, and the surface of the cored bar 132 on which the surface pressing punch 130 protrudes from the through hole 170 opposite to the surface pressing side of the peripheral wall 115 of the cylindrical portion of the workpiece 110. It is inserted into the workpiece 110 so as to contact the opposite surface 133.

Reference numeral 150 denotes a pressurizing means (P), and the core bar 132 is relatively moved in the direction in which pressing is performed between the surface pressing punch 130 and the receiving die 120 via the core bar holding portion (elevating block 140). At the same time, the burr 171a (see FIG. 23 (b)) generated on the inner peripheral edge 171 of the through hole 170 is obtained by pressing and moving the pressing pin 135 together with the core metal 132 and the surface pressing punch 130. The surface pressing punch 130 acts to press and crush the inner force of the cylindrical portion 112.

Reference numeral 145 denotes a push board which is pressed by the pressurizing means 50. A push pin 135 is attached to the push plate 145. The push plate 145 is provided with a push portion 145a for pushing the lifting block 140.

144 is an elevating guide that guides the movement (up and down movement) of the elevating block 140.

Further, in order to prevent the workpiece 110 from rotating, the workpiece 110 is fitted into a jig 116 having a rectangular outer shape and fixed with a screw 117. Reference numeral 122 denotes a receiving portion that receives the jig 116 at a predetermined position and positions the workpiece 110.

Reference numeral 152 denotes a stripper portion that is a portion that holds the workpiece 110 when the punch 130 is pulled out of the workpiece 110. The stripper portion 152 is provided with a guide hole 153 so that the pressing pin 135 can pass therethrough.

Reference numeral 155 denotes return means, which is constituted by the return panel 156 and the return means 157 of the pressing pin 135. As these return panel 156 and return means 157, coil springs can be employed. The return panel 156 is placed between the lifting block 140 and the base panel 143. 'You are dressed up. With this return panel 156, after the pressurizing step is completed, the surface pressing punch 130 can be raised and returned to the position before pressurization via the ascending / descending block 140 and the cored bar 132. Further, the pressing means 135 can be raised and returned to the position before pressurization by the return means 157.

Next, a process of pressing the burr 171a on the inner peripheral edge 171 of the through hole 170 using the processing apparatus having the above-described constituent force will be described with reference to FIGS.

22 and 23, the workpiece 110 is positioned on the receiving die 120 that abuts the outer wall surface of the portion where the through-hole 170 of the peripheral wall 115 of the cylindrical portion is opened, and the rod 110 is held in a cantilever manner. The surface pressing punch 130 protruding from the core bar 132 is inserted inside the cylindrical portion 112 so as to face the portion where the through hole 170 is opened, and the pressing pin 135 is protruded from the surface pressing punch 130. The cylindrical portion of the workpiece 110 was inserted into the workpiece 110 through the through-hole 170 opposite to the surface pressed side of the peripheral wall 115 of the cylindrical portion of the workpiece 110 so as to contact the surface 133 opposite to the surface of the cored bar 132 The state is shown. FIG. 23 (a) is a cross-sectional view of the main part of FIG. 22 as seen from the front, and FIG. 23 (b) is an enlarged view showing the burr 171a part of FIG. 23 (a).

At this time, the through-hole 170 is a hole formed by punching the punch 137 (see FIG. 27) with an external force, and has a shearing portion 170a, a fracture 170b, and a sag portion 170c as shown in FIG. A burr 171a protrudes from the inner peripheral edge 171 of the through hole.

24 and 25, the metal core 132 is relatively added in the direction in which the pressing is performed between the surface pressing punch 130 and the receiving die 120 via the metal core holding portion 140. Simultaneously with the pressure movement, the pressure pin 135 inserted into the workpiece 110 is pressed and moved together with the core bar 132 and the surface pressing punch 130, so that the burr 17 la generated on the inner peripheral edge 171 of the through hole 170 is surfaced. A state in which the inner force of the cylindrical portion 112 is pressed and crushed by the push punch 130 is shown. FIG. 24 is a cross-sectional view seen from the side showing the state where the surface pressing punch 130 is surface pressing. FIG. 25 (a) is a cross-sectional view as seen from the front of FIG. 24, and FIG. 25 (b) is an enlarged view showing a portion of the inner peripheral edge 171 in FIG.

By pressing using the pressing pin 135 in this way, the surface pressing punch 130 can press the entire circumference of the inner peripheral edge 171 of the through-hole uniformly with a good balance. Therefore, the surface pressing punch 130 can press and crush the groove 171a in a suitable and reliable manner. Further, by reversing the jig 116, the burr 171a of the inner peripheral edge 171 can be eliminated for both the through holes 170 formed in the opposing portions of the peripheral wall 115 of the cylindrical portion of the workpiece 110.

[0059] With the processing device for a through hole in the work peripheral wall described above, the through hole 170 provided in the peripheral wall 15 of the tubular part 12 is processed for the work 10 having at least a part of the tubular part 12. This can be verified by inspecting the crushing state of the burr 171a (see FIG. 23 (b)) at the inner periphery 171 of the through hole.

Next, based on FIGS. 26 and 27, an apparatus for drilling a through-hole 170 in the peripheral wall 115 of the workpiece 110 in which the above-described surface pressing process is performed on the inner peripheral edge 171 in a later step will be described.

FIG. 26 is a cross-sectional view of the punching device and work 110, which also shows a side force showing a state in which the mold before the work 110 is set in the mold is opened. FIG. 27 is a cross-sectional view seen from the side showing the state in which the workpiece 110 is set in a mold and the punch 137 is driven from the outside of the cylindrical portion 112 to form a through hole 170.

Note that this drilling device has many common configurations with the first drilling device unit 100 that drills the working through-hole 72 described above. A different configuration will be described in detail.

[0061] Reference numeral 127 denotes a die, which is provided at a front end portion 128a of a rod-shaped die core bar 128 held in a cantilever manner. In this embodiment, the die 127 is formed on the upper portion of the side wall of the die core 128. As shown in FIG. 27, the die 127 is inserted into the cylindrical portion 12 so as to face the inner wall surface of the portion where the through hole 170 is to be opened as shown in FIG. Note that the die 127 is relatively inserted into the inside of the cylindrical portion 112 even when the workpiece 110 is conveyed by the feeder and fitted to the tip end portion 128a of the die core 128 provided with the die 127. .

[0062] The die cored bar 128 is inserted in the horizontal direction into the holding hole 141a of the holder 141 that holds the die cored bar 128, and the rear end side 128b force opposite to the tip side 128a where the die 127 is provided. And is detachably fixed with screws. A flat portion for preventing rotation is provided on the side surface of the die core metal 128. For this reason, it can exchange easily and suitably.

In addition, a die discharge hole 129 is penetrated through the axial center of the die core metal 128. The hole 127a forming the hole 127a communicates with the hole 127a. A passageway 129a connected to a compressed air source (not shown) is communicated with the outlet hole 129 of the punched residue so that compressed air is introduced from the front end side 128a. According to this, the punching residue 182 (see FIG. 27) can be blown off from the front end side 128a of the die core metal 128 to the rear end side 128b and discharged. Therefore, productivity can be improved.

In addition, the workpiece 110 is fixed to a jig 116 having a rectangular outer shape with a screw 117 in order to prevent the workpiece 110 from rotating. A receiving portion 123 receives the jig 116 at a predetermined position and positions the workpiece 110. Reference numeral 125 denotes a receiving portion of the processing portion, which is a portion that receives the cylindrical portion 112 of the workpiece 110 to be processed.

Reference numeral 190 denotes a push plate, which is pressed by the pressurizing means 191. A pin-shaped punch 137 (circular cross section) is attached to the press 190.

Reference numeral 126 denotes a part of the strutsno, which is a part that holds the work 110 when the punch 137 is pulled out of the work 110. In this embodiment, it is provided integrally with the receiving portion 125 of the processing portion. The stripper portion 126 is provided with a guide hole 138 so that the punch 137 can pass therethrough.

The pressurization means and the return means applied to the push plate 190 may be appropriately used with the known techniques as described above, and the description thereof is omitted.

[0064] According to the drilling device for the through-hole 170 having the above-described constituent force, the jig 116 is reversed so that the punch 137 can be formed on both sides of the cylindrical wall of the workpiece 110 from the outside. Can be suitably drilled.

Since the die 127 is inserted into the workpiece 110 and the punch 137 is driven in, the through-hole 170 is suitably drilled without deformation of the workpiece 110 as in the case of normal press processing.

Note that due to the durability problem of the die 127, the diameter of the through hole 170 is suitable for a case where the diameter is relatively smaller than the inner diameter of the workpiece 110. That is, when the diameter of the through-hole 170 is small, it is possible to suppress the cross-section of the cutting edge of the die 127 inserted into the cylindrical portion 112 in order to open the through-hole 170 from being an acute corner. For this reason, the die life of the die 127 is not shortened, and productivity can be improved.

[0065] In the above embodiment, a case where an oval through hole (long hole) is formed has been described. However, the present invention is not limited to this, and can of course be applied to the case of drilling through holes having other shapes such as a circle and an ellipse.

In addition, materials for each component such as punches, dies, and cores should be appropriately selected from known materials according to the specifications to obtain suitable molds with high drilling accuracy and long life. do it. Furthermore, with regard to punches and dies, it is necessary to use known surface hardening techniques as needed to improve their durability.

As described above, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

Claims

The scope of the claims

[1] A method of drilling a through hole by press punching in a peripheral wall of a cylindrical part of a workpiece having at least a part of the cylindrical part,

The workpiece is positioned on a die that comes into contact with the outer wall surface of the portion where the through hole of the peripheral wall of the cylindrical portion is to be opened, and a punch projecting from a rod-shaped core metal held in a cantilever is inserted into the through hole. Is inserted into the inside of the tubular part so as to face the inner wall surface of the part to be opened,

A portion on the opposite side of the peripheral wall portion where the through-hole of the workpiece is to be opened at the same time as the core metal is relatively moved in the direction in which punching is performed between the punch and the die through the holding portion of the core metal The pressing pin inserted into the work so as to come into contact with the surface opposite to the surface of the core metal from which the punch protrudes is moved with the core metal and the punch through the work through hole provided in With this, the punch is driven into the inner wall of the cylindrical part and the through-hole is drilled,

The cored bar is moved in the strip direction opposite to the punching direction via the cored bar holding portion, and at the same time, the push-back pin abutted on the end face of the punch is moved in the stripping direction. A method of drilling a through hole in a work peripheral wall, characterized in that the punch is pushed back and stripped from the work.

[2] A method of drilling through holes by press punching in both opposing portions of the peripheral wall of the cylindrical part of the workpiece having at least a part of the cylindrical part,

A work through-hole, which is smaller than the through-hole to be opened later, is punched from the outside of the cylindrical portion in the part opposite to the peripheral wall part where the through-hole should be opened at the beginning of the workpiece. And

The workpiece is positioned on a die that comes into contact with the outer wall surface of the portion where the through-hole is to be opened at the beginning of the peripheral wall of the cylindrical portion, and a punch protruding from a rod-shaped core metal held in a cantilever manner is first used. Inserted into the inside of the cylindrical portion so as to face the inner wall surface of the portion where the through hole is to be opened,

At the same time, the core metal is relatively moved in the direction in which punching is performed between the punch and the die via the core metal holding portion, and at the same time, the core is provided with a punch projecting from the working through hole. A pressing pin inserted into the workpiece so as to abut against the surface opposite to the gold surface is pressed and moved together with the core metal and the punch so that the punch is driven into the peripheral wall from the inside of the cylindrical portion and penetrated. Drill a hole,

The cored bar is moved in the strip direction opposite to the punching direction via the cored bar holding portion, and at the same time, the push-back pin abutted on the end face of the punch is moved in the stripping direction. And push the punch back to strip from the workpiece,

The workpiece is positioned on a die that abuts against the outer wall surface of the portion corresponding to the through hole for the work to be drilled after the peripheral wall of the cylindrical portion, and is attached to a rod-shaped core bar held in a cantilever manner. The projecting punch is inserted into the cylindrical portion so as to face the inner wall surface of the portion corresponding to the work through-hole where the through-hole is to be opened later, and the core bar is inserted into the core bar. The pressure is moved relatively in the direction in which punching is performed between the punch and the die via the holding portion, and at the same time, the surface of the core bar from which the punch protrudes from the through hole drilled in the previous process. The pressing pin inserted into the workpiece so as to abut against the opposite surface is pressed and moved together with the core metal and the punch to drive the punch into the peripheral wall from the inside of the cylindrical portion and to penetrate the work. Drill a through hole containing the hole,

[3] From the drilling position where the through hole is drilled by the die and the punch, to the strip position where the adjacent pushback pin is disposed, the die and the pushback pin are relatively positioned with respect to the punch and the workpiece. 3. The method of drilling a through hole in a work peripheral wall according to claim 1, wherein the work force is stripped by the push-back pin.

[4] An apparatus for drilling a through hole by press punching in a peripheral wall of a cylindrical part of a workpiece having at least a part of the cylindrical part,

A die that abuts on the outer wall surface of the portion where the through hole of the peripheral wall of the cylindrical portion is to be opened, and an inner wall of the portion where the through hole is to be opened by protruding from a rod-shaped core metal held in a cantilever manner A punch that is inserted into the cylindrical portion in a state of facing the surface;

A punch is inserted into the work so that it comes into contact with the surface opposite to the surface of the cored bar from the work through hole provided on the opposite side of the peripheral wall to be opened. A pressing pin;

The cored bar is relatively moved in the direction in which punching is performed between the punch and the die through the cored bar holding portion, and at the same time, the pressing pin is pressed and moved together with the cored bar and the punch. A pressurizing means for punching a punch into the inner wall of the cylindrical portion and thereby forming a through hole;

A push-back pin abutting against the cutting edge of the punch for stripping the punch with a work force;

The core bar is moved in the strip direction opposite to the punching direction via the core bar holding portion, and at the same time, the punch is pushed back to strip from the workpiece by moving the push-back pin in the strip direction. A device for drilling a through hole in a work peripheral wall, characterized by comprising push-back means.

An apparatus for punching through holes by press punching in both opposing portions of the peripheral wall of the cylindrical part of a workpiece having at least a part of the cylindrical part,

A punch for punching a work through hole, which is a hole smaller than a through hole to be opened later, from the outside of the cylindrical part is formed in a part opposite to the peripheral wall part where the through hole is to be opened at the beginning of the workpiece. A first drilling device unit comprising:

A die that contacts the outer wall surface of the portion where the through hole of the peripheral wall of the cylindrical portion is to be opened, and the inner wall surface of the portion where the through hole is to be opened by protruding from a bar-shaped cored bar held in a cantilever manner The punch is inserted into the cylindrical portion in the state, and the inside of the workpiece is brought into contact with the surface opposite to the surface of the core metal from which the punch protrudes from the working through hole or the drilled through hole. The pressing pin inserted into the core and the core metal are relatively moved in a direction in which punching is performed between the punch and the die via the core metal holding portion, and at the same time, the pressing pin is moved to the core metal and A pressing means for punching a punch into the peripheral wall from the inside of the cylindrical portion by pressing and moving together with the punch to form a through hole, and a cutting edge of the punch for stripping the punch from the workpiece A push-back pin that comes into contact with the Gold And a second push-back means for moving the push-back pin back in the strip direction to push the punch back and strip it from the workpiece. A drilling device for a through hole in a work peripheral wall, comprising: a drilling device unit.

[6] A strip position where the push-back pin is disposed adjacent to a drilling position where a through-hole is drilled by the die and the punch is provided,

The moving means for moving the die and the push-back pin relative to the punch and the workpiece from the drilling position to the strip position is provided.

5. A through-hole drilling device in a workpiece peripheral wall according to 5.

[7] The cored bar is detachably fixed by being inserted into a holding hole of a cored bar holder, which is a holding part of the cored bar, on the rear end side opposite to the tip side where the punch protrudes. The device for drilling a through hole in a work peripheral wall according to claim 4, 5 or 6, characterized by the above.

[8] The through-hole in the workpiece peripheral wall according to claim 4, 5, 6, or 7, wherein a cutting edge end surface of the punch is chamfered so as to follow a shape of an inner peripheral surface of the cylindrical portion. Hole drilling device.

[9] The apparatus according to any one of claims 4 and 5, further comprising: suction means for sucking and removing the punched debris that opens the through-hole when the through-hole is drilled. 6, 7 or 8 A device for drilling a through hole in a work peripheral wall.

[10] The first punching device unit is configured such that when the outer force of the cylindrical portion of the workpiece is also punched to punch the work through-hole, a punched piece is formed at one of the inner peripheral edges of the work through-hole. A component force provided with an insertion member for preventing the rotation of the punched portion provided so as to be inserted into the inside of the cylindrical portion of the workpiece that prevents the component from rotating and remaining in a state where it is not separated. The through-hole drilling device in the work peripheral wall according to claim 5, 6, 7, 8, or 9.

[11] A workpiece having at least a part of a cylindrical portion, wherein the peripheral wall of the cylindrical portion is formed by the through-hole drilling device in the peripheral wall of the workpiece according to claim 4, 5, 6, 7, 8, 9, or 10. A workpiece characterized by opening a through hole.

[12] With respect to the through-hole formed by punching from both sides into the opposing part of the peripheral wall of the cylindrical part of the workpiece having at least a part of the cylindrical part, the through-hole A processing method for pressing burrs generated on the inner periphery of

The workpiece is positioned on a receiving die that comes into contact with the outer wall surface of the peripheral wall of the cylindrical portion where the through-hole is opened, and a surface pressing punch protruding from a bar-shaped cored bar held in a cantilever manner, Insert into the inside of the tubular part in a state facing the part where the through hole is opened,

The core bar is relatively moved in the direction of pressing between the surface pressing punch and the receiving die via the core bar holding portion, and at the same time, the cylindrical portion of the workpiece is A pressing pin inserted into the workpiece so as to come into contact with the surface opposite to the surface of the core metal from which the surface pressing punch protrudes from the through hole on the peripheral wall opposite to the surface pressed side, By pressing and moving together with the metal core and the surface pressing punch, the burr generated on the inner peripheral edge of the through hole is pressed by the inner pressing force of the cylindrical portion by the surface pressing punch and crushed. A method for processing a through hole in a peripheral wall.

[13] With respect to a through hole that is punched from the outside into both opposing portions of the peripheral wall of the cylindrical part of the workpiece having at least a part of the cylindrical part, the inner peripheral edge of the through hole A processing device that presses burrs generated in

A receiving die that comes into contact with the outer wall surface of the portion of the cylindrical wall where the through-hole is opened, and a rod-shaped metal core that is held in a cantilever manner, and faces the portion where the through-hole is opened. A surface pressing punch that is inserted into the cylindrical portion in a state;

From the through hole on the peripheral wall of the cylindrical portion of the workpiece opposite to the surface-pressed side, the surface-pressing punch projects into the surface opposite to the surface of the cored bar. A pressing pin to be inserted;

At the same time, the core metal is relatively moved in the direction in which the pressing is performed between the surface pressing punch and the receiving die through the core metal holding portion, and at the same time, the pressing pin is moved to the core metal and Pressurizing and moving together with the surface pressing punch, and pressurizing means for pressing and crushing the burrs generated on the inner peripheral edge of the through-hole from the inside of the cylindrical portion by the surface pressing punch. A processing device for a through hole in a work peripheral wall.

[14] A tip guide portion through which the surface pressing punch can enter the through hole, and a surface pressing R portion provided in a cross-sectional R shape that is a portion that contacts the inner periphery of the through hole and crushes the groove. Prepare The through hole processing apparatus according to claim 13, wherein:

A workpiece having at least a part of a cylindrical part, wherein the through hole provided in the peripheral wall of the cylindrical part is processed by the processing device for a through hole in the peripheral wall of the work according to claim 13 or 14. work.