JP2008246493A - Apparatus and method for making hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for making a hole, by which apparatus and method, the flatness of a workpiece can be secured. <P>SOLUTION: The apparatus 1 for making the hole on the workpiece 2 by punching the workpiece 2 supported on a die 3 by means of a punch 4 comprises a movable body 6 which supports the punch 4 and can move in the axial direction of the punch 4, a first pushing means 7 for applying a pushing force on the punch 4 so as to make the hole by moving the movable body 6, a stripper cylinder 30 which has an oil chamber 37 to be contracted with the movement of the movable body 6 and presses the workpiece 2 by the pressure of the oil chamber 37, and a pressure setting means for setting the pressure of the oil chamber 37 to required pressure. The punch 4 punches the workpiece 2 in the state that the stripper cylinder 30 presses the workpiece 2 by the pressure of the oil chamber 37. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drilling apparatus and a drilling method for drilling holes in a workpiece.

  As a conventional device for punching a metal workpiece using a punch, the workpiece is guided by a stripper to prevent deformation of the workpiece when the punch is pressed against the workpiece. There is known an apparatus for performing a drilling process.

In this type of apparatus, the strength with which the stripper presses the workpiece is generally adjusted using a spring (see, for example, Patent Document 1).
JP 2000-312928 A

  However, the urging force of the spring cannot sufficiently guide the work piece by the stripper, and the work piece cannot be sufficiently prevented from being deformed when a punch is pressed against the work piece to make a hole. In that case, the flatness of the workpiece after drilling is not ensured.

  When a workpiece whose flatness is not ensured is fastened to another member, the workpiece and the other member do not come into contact with each other in a flat shape, so that a sufficient fastening force cannot be obtained.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a drilling device and a drilling method that can ensure the flatness of a workpiece.

  The present invention relates to a punching device for punching a workpiece supported by a die with a punch to open a hole in the workpiece, the movable body supporting the punch and movable in the axial direction of the punch, And a pressing means for applying a pressing force to the punch by moving the moving body, and an oil chamber that contracts as the moving body moves. A stripper cylinder that presses a workpiece; and pressure setting means that sets a pressure of the oil chamber to a desired pressure. The puncher presses the workpiece in a state where the workpiece is pressed by the pressure of the oil chamber. Is characterized by punching a workpiece.

  According to the present invention, the workpiece is punched by the punch while the stripper presses the workpiece with the pressure of the oil chamber, and the pressure of the oil chamber is set by the pressure setting means. As described above, the stripper pressure for preventing the deformation of the workpiece can be arbitrarily set by the pressure setting means, and can be sufficiently ensured. Therefore, the workpiece can be prevented from being deformed when the punch punches the workpiece, and the flatness of the workpiece can be ensured.

  Embodiments of the present invention will be described below with reference to the drawings.

  With reference to FIG. 1, the drilling apparatus 1 of embodiment of this invention is demonstrated. FIG. 1A is a plan view of the drilling device 1, and FIG. 1B is a cross-sectional view of the drilling device 1.

  The hole punching device 1 is a device that punches a metal workpiece supported by a die 3 with a punch 4 and opens a hole in the workpiece.

  The workpiece in the present embodiment is a knuckle bracket 2 for connecting the shock absorber to the axle of the vehicle. The knuckle bracket 2 includes a main body portion 2a that holds the outer periphery of the tube of the shock absorber, and a pair of attachment portions 2b that are formed to protrude in parallel from the main body portion 2a and are fastened to the knuckle of the axle with bolts.

  The die 3 has through-holes 3b (two in this embodiment) in which openings 3a having substantially the same shape as the holes to be processed into the attachment portion 2b are formed on both side surfaces, and the die 3 stands on the base 5 The pair of side walls 5 a are coupled to each other and disposed on the base 5.

  The knuckle bracket 2 is supported by the die 3 in a state where the main body portion 2 a is locked to a jig 3 c formed on the top surface of the die 3 and the pair of attachment portions 2 b closes the opening 3 a of the die 3. .

  The drilling device 1 is a device that punches out each of the pair of attachment portions 2b from both sides of the die 3 and simultaneously processes bolt fastening holes in the pair of attachment portions 2b.

  The punching device 1 is disposed opposite to the opening 3a of the die 3 and punches the punching portion into the mounting portion 2b, and a pair of sliders 6 (moving) that supports the punch 4 and is movable in the axial direction of the punch 4. Body), a pressing device 7 (pressing means) for applying a pressing force for punching the punch 4 by moving the slider 6, and mounting when the punch 4 punches the mounting portion 2b by pressing the mounting portion 2b. A stripper cylinder 30 for preventing deformation of the portion 2b.

  The punch 4 is held on the holder 10 supported by the slider 6 coaxially with the through hole 3 b of the die 3, and a flange 4 a for preventing the punch 4 from coming out of the holder 10 is provided at the base end portion. Thus, the punch 4 is held by the slider 6 via the holder 10 and moves in the axial direction by the movement of the slider 6. In the present embodiment, a case where a total of four punches 4 are arranged on each side of the die 3 and two holes are formed in each of the pair of attachment portions 2b will be described.

  The slider 6 is disposed on the base 5 so as to be movable along a pair of side walls 5a, and has a groove 6a at the bottom and a claw 6b at the ceiling. The holder 10 is supported by the slider 6 by being fitted in the groove 6a and being locked by the claw 6b.

  The pressing device 7 includes a pair of wedge cams 12 having an inclined surface 12a corresponding to the inclined surface 6c formed on a part of the back surface of the slider 6, and a moving mechanism (not shown) for moving the pressing device 7 up and down in the drawing. ). As a driving source for the moving mechanism, for example, a hydraulic pressure or a servo motor is used.

  The pressing device 7 moves the slider 6 toward the die 3 (hereinafter referred to as “advance”) by pressing the wedge cam 12 against the inclined surface 6 c on the back surface of the slider 6, and the punch 4 is moved to the knuckle bracket 2. This is for pressing against the mounting portion 2b. As described above, the load of the press device 7 is applied to the attachment portion 2 b via the wedge cam 12, the slider 6, and the punch 4. Therefore, by adjusting the pressing force of the wedge cam 12 against the slider 6, the pressing force of the punch 4 on the mounting portion 2b is adjusted.

  The stripper cylinder 30 includes a cylinder case 31 having a cylinder hole 31 a through which the punch 4 is inserted. The cylinder case 31 is placed on the slider 6 so as to be movable relative to the punch 4.

  A pair of shafts 32 extending in parallel with the punch 4 are inserted through the die 3, the slider 6, and the cylinder case 31, and the slider 6 and the cylinder case 31 are movable along the shaft 32.

  A stripper 18 for directly pressing the mounting portion 2b to prevent deformation of the mounting portion 2b is attached to the opening on one end side (die 3 side) of the cylinder hole 31a, and the punch 4 is slidable on the stripper 18. It is inserted.

  The stripper 18 includes a pressing portion 18a that presses the attachment portion 2b at the end surface, a fastening portion 18b that is formed in a flange shape and has a screw on the outer periphery, and a body portion 18c that is inserted into the cylinder hole 31a. The stripper 18 is attached to the cylinder case 31 by fastening the fastening portion 18b to the female thread portion on the inner periphery of the opening end of the cylinder hole 31a. In a state where the stripper 18 is attached to the cylinder case 31, the pressing portion 18a of the stripper 18 protrudes from the cylinder case 31 and faces the attachment portion 2b.

  A piston body 34 is slidably inserted into the cylinder hole 31a of the cylinder case 31, and the punch 4 is slidably inserted into the piston body 34. Thus, the punch 4 is inserted through the piston body 34 and the stripper 18.

  The piston body 34 is slidable along the outer periphery of the punch 4 and the piston head 34 a that slides between the inner periphery of the cylinder hole 31 a and the outer periphery of the body portion 18 c of the stripper 18. And a guide portion 34b for positioning on the same axis.

  Since the guide portion 34 b has a rear end surface facing the holder 10, the pressing force of the press device 7 acts on the piston body 34 via the slider 6.

  The cylinder hole 31a defines an oil chamber 37 in which hydraulic oil is enclosed by the piston head 34a of the piston body 34 and the body portion 18c of the stripper 18. Thus, the piston body 34 is interposed between the oil chamber 37 and the slider 6, and enters the cylinder hole 31 a as the slider 6 moves to contract the oil chamber 37.

  In addition, an annular stopper 35 for preventing the piston body 34 from coming out of the cylinder hole 31a is screwed to the inner periphery of the opening end on the other end side (holder 10 side) of the cylinder hole 31a.

  The cylinder case 31 is formed with a supply flow path 38 that communicates with the oil chamber 37 and supplies hydraulic oil from a hydraulic supply source (not shown) to the oil chamber 37.

  The pressure in the oil chamber 37 is set to a desired pressure by a pressure setting means (not shown) connected to the supply flow path 38 and is held at the set pressure.

  As the pressure setting means, for example, a pump that supplies hydraulic oil to the supply flow path 38 and a supply flow path that is provided at the discharge port of the pump and opens when the pressure of the supply flow path 38 reaches the set pressure. A relief valve that keeps the pressure of 38 constant, an accumulator that is connected to the supply flow path 38, or the like is used.

  A spring 14 is disposed around the shaft 32 between the die 3 and the cylinder case 31. The spring 14 is compressed when the slider 6 moves forward by the drive of the press device 7, and when the pressing force against the slider 6 by the press device 7 is released, the spring 6 passes through the cylinder case 31 by the biasing force. Is moved in a direction away from the die 3 (hereinafter referred to as “retreat”).

  When the pressing force applied to the slider 6 by the press device 7 is completely released, the slider 6 is supported by the urging force of the spring 14 while the back surface is in contact with the rear wall 5b standing rearward. The cylinder case 31 is disposed on the slider 6 with the holder 10 in contact with the back surface of the piston body 34.

  Next, with reference to FIG.1 and FIG.2, operation | movement of the punching apparatus 1 is demonstrated. FIG. 1 is a view showing a state before the punching process in which the press device 7 is at the uppermost end, and FIG. 2 is a view showing a state in which the press device 7 is lowered to the lowermost end. 1 and 2, (a) is a plan view, (b) is a cross-sectional view, and the press device 7 is not shown in (a).

  As shown in FIG. 1, in the state before the press with the press device 7 at the uppermost end, the slider 6 is retracted by the urging force of the spring 14 and is arranged with the back surface in contact with the rear wall 5b. . The oil chamber 37 is in a state where the pressure is kept constant and expanded to the maximum volume.

  From this state, the press device 7 is lowered to bring the inclined surface 12a of the wedge cam 12 into contact with the inclined surface 6c on the back surface of the slider 6. As the press device 7 descends, the slider 6 advances while being guided by the inclined surface 12 a of the wedge cam 12.

  By the advance of the slider 6, the stripper 18 and the punch 4 are brought into contact with the outer surface of the mounting portion 2b of the knuckle bracket 2 while maintaining the relative positional relationship shown in FIG.

  Further, when the slider 6 moves forward, the punch 4 bites into the mounting portion 2b by the pressing force of the pressing device 7, and the oil chamber 37 contracts due to the discharge of hydraulic oil due to the piston body 34 entering the cylinder hole 31a. To do.

  As described above, the oil chamber 37 contracts as the slider 6 advances, but the internal pressure is constant or is maintained at a desired pressure by the action of the accumulator, and thus the stripper 18 is firmly pressed by the pressure. Thereby, the stripper 18 presses the attachment portion 2 b against the die 3, and the attachment portion 2 b comes into close contact with the die 3. As described above, the stripper 18 presses the attachment portion 2 b with the stripper pressure defined by the pressure of the oil chamber 37.

  As shown in FIG. 2, when the press device 7 reaches the lowest end, the oil chamber 37 is in the most contracted state, the tip of the punch 4 reaches the opening 3a of the die 3, and the mounting portion 2b is punched out. The through hole 3b of the die 3 is provided with a hole 3d through which the residue when the attachment portion 2b is punched.

  When the punch 4 punches the mounting portion 2b, the portions other than the punched portion of the mounting portion 2b are in close contact with the die 3 by the stripper pressure defined by the pressure of the oil chamber 37, and therefore deformation of the mounting portion 2b is prevented. Is done.

  In this way, the oil chamber 37 can be punched out of the mounting portion 2b by the punch 4 by contracting, and the mounting portion 2b is pressed against the die 3 by the internal pressure, so that the mounting portion 2b is deformed. Functions to prevent.

  When the pressing force of the punch 4 for punching the mounting portion 2b set by the press device 7 is large and the mounting portion 2b is easily deformed, the set pressure of the oil chamber 37 may be increased. Thereby, since the stripper pressure of the stripper 18 becomes large, it is possible to prevent deformation of the mounting portion 2b when the mounting portion 2b is punched by the punch 4. As described above, the stripper pressure defined by the pressure in the oil chamber 37 may be set according to the pressing force for drilling applied to the punch 4 by the press device 7.

  After the press device 7 reaches the lowest end, the press device 7 is raised. As the press device 7 is raised, the pressing force of the press device 7 on the slider 6 is released. As the pressing force of the press device 7 is released, hydraulic oil is supplied to the oil chamber 37 and the oil chamber 37 expands, so that the piston body 34 retreats from the cylinder hole 31a. The slider 6 moves backward by the movement of the piston body 34.

  After the volume of the oil chamber 37 is expanded to the maximum, the slider 6 is moved backward by the biasing force of the spring 14 until the back surface comes into contact with the rear wall 5b.

  As described above, by lowering and raising the press device 7, the hole portion for the attachment portion 2 b of the knuckle bracket 2 is processed.

  The drilling by the drilling device 1 described above is applicable to the knuckle bracket 2 formed by bending a single plate, and as shown in FIGS. The present invention is also applicable to a knuckle bracket 2 in which a U-shaped reinforcing portion 2c is attached to the inner periphery of the attachment portion 2b, that is, the attachment portion 2b is formed of a double plate.

  When the U-shaped reinforcing portion 2c is attached to the inner periphery of the attaching portion 2b, the attaching portion 2b and the reinforcing portion 2c are joined by welding, but there is a gap between the attaching portion 2b and the reinforcing portion 2c. There is a case. In such a case, when the punch 4 punches the attachment portion 2b and the reinforcement portion 2c, the attachment portion 2b and the reinforcement portion 2c are likely to be deformed. However, when drilling is performed using the drilling device 1, the stripper 18 presses the mounting portion 2b and the reinforcing portion 2c by the pressure of the oil chamber 37, so that the mounting portion 2b and the reinforcing portion 2c are in close contact with each other without any gap. And in close contact with the die 3. Therefore, deformation of the attachment portion 2b and the reinforcement portion 2c when the attachment portion 2b and the reinforcement portion 2c are punched by the punch 4 is prevented. Thus, drilling by the drilling device 1 is particularly effective when applied to the knuckle bracket 2 in which the mounting portion 2b is formed of a double plate.

  According to the above embodiment, the following effects are obtained.

  Processing of the hole in the attachment portion 2b by the punching device 1 is performed by moving the slider 6 supporting the punch 4 by the press device 7 in a state where the stripper 18 presses the attachment portion 2b with the pressure of the oil chamber 37. The pressure in the oil chamber 37 is set by the pressure setting means. Thus, since the stripper pressure for preventing the deformation | transformation of the attaching part 2b can be arbitrarily set by a pressure setting means, it can fully ensure. Therefore, the punching of the mounting portion 2b by the punch 4 is performed in a state where the mounting portion 2b is in close contact with the die 3, so that deformation of the mounting portion 2b when the punch 4 punches the mounting portion 2b can be prevented. The flatness of the part 2b can be ensured.

  Further, in the conventional drilling device, after performing the punching process of the workpiece, it is necessary to perform a pressing process for returning the deformation (warping) of the workpiece due to the punching. However, since the punching device 1 prevents deformation of the workpiece during the punching process, a pressing process is not necessary, and it is very efficient as compared with a conventional punching device.

  Moreover, after punching out the attachment part 2b with the punch 4, when the attachment part 2b is pressed in another process and the deformation of the attachment part 2b is returned, the diameter of the punched hole part is reduced by the press. However, since the punching device 1 does not require a pressing process after the punching process, the diameter of the punched hole is not reduced, and the dimensional accuracy of the hole can be ensured.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  The present invention can be applied to an apparatus for processing a bolt fastening hole in a knuckle bracket for connecting a shock absorber to an axle of a vehicle.

(A) It is a top view which shows the drilling apparatus which concerns on embodiment of this invention. (B) It is sectional drawing which similarly shows a drilling apparatus. (A) It is a top view which shows the punching apparatus of the state which the press apparatus fell to the lowest end. (B) It is sectional drawing which shows the punching apparatus in the state which the press apparatus fell to the lowest end.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hole punching device 2 Knuckle bracket 2a Main part 2b Mounting part 3 Die 3a Opening 4 Punch 6 Slider 7 Press device 10 Holder 12 Wedge cam 14 Spring 18 Stripper 30 Stripper cylinder 31 Cylinder case 34 Piston body 35 Stopper 37 Oil chamber 38 Supply flow Road

Claims (5)

A punching device for punching a workpiece supported by a die with a punch to open a hole in the workpiece,
A movable body that supports the punch and is movable in the axial direction of the punch;
A pressing means for applying a pressing force for punching the punch by moving the moving body;
A stripper cylinder that has an oil chamber that contracts as the moving body moves, and that presses the workpiece by the pressure of the oil chamber;
Pressure setting means for setting the pressure in the oil chamber to a desired pressure, and
A punching device, wherein the punch punches out the workpiece while the stripper cylinder presses the workpiece with the pressure of the oil chamber.   The punching device according to claim 1, wherein the pressure setting means sets the pressure of the oil chamber according to the pressing force applied to the punch by the pressing means. The stripper cylinder is
A cylinder case having a cylinder hole in which the punch is inserted and the oil chamber is defined;
A stripper supported by the cylinder case and pressing the workpiece with the pressure of the oil chamber;
A piston body that is slidably inserted into the cylinder hole and interposed between the oil chamber and the movable body,
The oil chamber shrinks by the piston body entering the cylinder hole as the moving body moves, and enables the workpiece to be punched by the punch, and the workpiece is moved by the internal pressure. The punching device according to claim 1, wherein the punching device is pressed against the die to prevent deformation of the workpiece. The die has an opening into which the punch is inserted;
The workpiece is a knuckle bracket for connecting the shock absorber to the vehicle,
The knuckle bracket is
A main body for gripping the outer periphery of the tube of the shock absorber;
A pair of attachment portions formed to project in parallel from the main body portion,
4. The punching device according to claim 1, wherein the pair of attachment portions are supported by the die in a state in which the opening is closed. 5. A punching method in which a workpiece supported by a die is punched by a punch to open a hole in the workpiece,
A movable body that supports the punch and is movable in the axial direction of the punch;
A pressing means for applying a pressing force for punching the punch by moving the moving body;
A stripper cylinder that has an oil chamber that contracts as the moving body moves, and that presses the workpiece by the pressure of the oil chamber;
Pressure setting means for setting the pressure of the oil chamber to a desired pressure, and
As the moving body moves, the stripper cylinder presses the workpiece with the pressure of the oil chamber,
A punching method, wherein the punch punches a workpiece by further movement of the movable body.