JP2933646B2 - Movable blade body holding structure of cutting machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed shear cutting machine typified by a percussion-type cutting machine, in particular, a movable blade main body rotates within a holder or comes out of the holder. The present invention relates to an improvement in a holding structure of a movable blade main body, which can prevent the occurrence of the problem.

[Conventional technology]

In the above-mentioned impact-type cutting machine, a fixed blade and a movable blade that can move up and down are arranged to face each other, a material to be cut is inserted into the through holes of both blades, and the movable blade is moved at a high speed by a striking force in this state. Is a device for cutting a material to be cut by a combination of shearing and breaking. FIGS. 5 to 7 show an example of a conventional impact-type cutting machine.

In the figure, reference numeral 1 denotes a striking cutter, which is mainly a base 2 fixed on a gantry 2a, a fixed blade 3 disposed on the base 2, and a positioning unit for positioning the fixed blade 3. 4, a movable blade 5 arranged vertically movable, a cutting length setting section 6 for defining a cutting length of a workpiece (hereinafter, referred to as a work) W, and a striking force acting on the movable blade 5,
And a striking device (actuating device) 7 for defining the vertical stroke of the movable blade 5.

The fixed blade 3 has a cylindrical shape having a guide hole 3a at its axis, and is fixed on the base 2 via a holder 3b. 3d is a compressed air passage for discharging the cut portion of the work W. In addition, the positioning unit 4
Is a nut member 4a fixed to the base 2 and a bolt member 4b
When the bolt member 4b is rotated, the tip of the bolt member 4b moves the fixed blade 3 forward.

The movable blade 5 is held on the base 2 so as to be vertically movable by a holder 5a, and has a structure in which the movable blade main body 9 is inserted and fixed in a holding hole 8a formed in the center of the holder 8 by shrink fitting. ing. The movable blade main body 9 has a disk shape, has a through hole 9a formed in the axis thereof, and has a U-shaped escape groove 9b formed on the back side thereof. The holder 8 is a rectangular flat plate having an upper edge formed with a convex portion 8b, and an edge portion of the holding hole 8a formed with an escape groove 8c extending upward so as to be continuous with the escape groove 9b. Have been. The escape grooves 9b and 8c are for preventing the movable blade 5 from interfering with a stopper head described later when the movable blade 5 is lowered.

The cutting length setting section 6 inserts a piston rod 11 into a cylinder 10 fixed on the base 2,
The detection rod 12 is slidably inserted in the axial direction, and the front end of the detection rod 12 is brought into contact with the tip of the work W so that the work W
The stopper head 13 for performing the positioning is fixed. A detection rod is provided at the rear end of the piston rod 11.
A proximity switch 14 is provided so as to face the rear end of the switch 12. A nut member is provided at the rear of the piston rod 11.
15 is screwed, and the forward end position of the piston rod 11 can be adjusted by rotating the nut member 15.

The hitting device 7 includes an air hammer 16 for hitting the convex portion 8b of the holder 8 and a cushion 17 including an air cylinder, a hydraulic damper, and the like. The cushion 17 connects the holder 8 to the through hole 9a of the movable blade main body 9. Supports the guide hole 3a at the same height as that of the guide hole 3a, and regulates the descending stroke of the holder 8 by the above-mentioned impact force to a predetermined value while buffering the impact force.

At the time of the cutting operation in the above-described conventional impact type cutting machine 1,
When the workpiece W is advanced by a feed mechanism (not shown), the tip of the workpiece W comes into contact with the stopper head 13, and the head 13
When the switch is slightly retracted along with 12, the proximity switch 14 outputs a work detection signal to the striking device 7. Then, the air hammer 16 strikes the holder 8, the movable blade 5 descends and cuts the work W, and the cut work is discharged to the back side of the movable blade 5 by the high-pressure air from the compressed air passage 3d. Also, at this time, since the stopper head 13 is located in the clearance grooves 9b and 8c of the movable blade 5, even if the movable blade 5 moves down, it does not interfere with it.

[Problems to be solved by the invention]

In the conventional impact type cutter 1, there is a problem that the movable blade main body 9 rotates around the axis in the holder 8, and the escape groove 9b of the movable blade main body 9 shifts and interferes with the stopper head 13. There is also a problem that the movable blade main body 9 moves in the axial direction from the holder 8 and gets out in an extreme case.

Such a problem occurs in the conventional cutting machine 1.
Since the movable blade body 9 was held by simply shrink-fitting the holder 8, the holding force was insufficient, and the movable blade body rotated due to vibrations caused by repeatedly acting striking forces,
It is considered missing.

In order to solve the problem of rotation etc., the two members 8, 9
Can be combined by the so-called metal flow method described in, for example, JP-A-55-94740.

In this method, as shown in FIG. 8 (a), a circumferential groove 51a is formed in a shaft-shaped first metal member 51 and the groove 5a is formed.
An axial groove 51b is formed at the bottom of 1a. And this first
The metal member 51 has a smaller deformation resistance,
The second metal member 52 having a is fitted and positioned at a predetermined position. In this state, the periphery of the coupling hole 52a of the second metal member 52 is pressed by the upper and lower dies 53, 54 having the annular projections 53a, 54a. As a result, as shown in FIG. 8 (b), the peripheral portion of the second metal member 52 flows into the coupling grooves 51a and 51b while being plastically deformed, and the plastically deformed portion 52b is inserted into the concave grooves 51a and 51b. 51b
So that the two members 51 and 52 are connected.

By the way, the above-mentioned conventional metal flow method is a method in which a part of one metal member is plastically deformed and flows into a concave groove of the other metal member. Therefore, the deformation resistance of at least one metal member is relatively small (hardness). Is low). However, since the movable blade main body and the holder of the cutting machine to which the present invention is applied are both generally made of a material having considerably high hardness, the above-mentioned conventional metal flow method is difficult to employ.

In the above metal flow method, the convex portions 5 of the pressing molds 53 and 54 are used.
The smaller the ratio w / d between the width w of the 3a and 54a and the depth of indentation d, the larger the bonding force, and conversely, the larger the ratio, the smaller the bonding force. In order to reduce the above ratio, the pressurized projection 53a,
54a needs to be elongated. However, if the projections are too thin, cracks may be generated near the roots of the projections. Therefore, there is naturally a limit, and currently, w / d = 1 is the limit. If the width w is too small, the convex portions 53a, 54
The surface pressure of a becomes extremely high, and a cemented carbide or the like is required as a mold, which causes an increase in cost. Further, in this case, there is a problem that the pressure trace becomes deep.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and has as its object to provide a movable blade main body holding structure of a percussion type cutting machine that can surely prevent the movable blade main body from rotating and coming off.

[Means for solving the problem]

The present invention provides a fixed blade, a movable blade having a movable blade main body held by a holder, a positioning member for defining a cutting length of a material to be cut, and an operation of moving the movable blade in a direction perpendicular to the material to be cut. In the cutting machine provided with the device, a structure for holding the movable blade body with a holder, wherein the movable blade body is fitted and inserted into a holding hole of the holder, and the movable blade body and the holder are At the boundary, extending in the fitting direction,
An annular groove having one end opened is formed, and a coupling groove extending in the circumferential direction is formed on each of the outer peripheral surface of the movable blade body and the inner peripheral surface of the holder. A protrusion having a larger diameter and a smaller diameter than the outer peripheral surface and the inner peripheral surface, respectively, is formed at an edge on the bottom side of the annular groove; A detent member engaged with both the main body and the holder is inserted and arranged from the annular groove side, and a coupling metal member having smaller deformation resistance than the movable blade main body and the holder is inserted into the annular groove, and the detent member is inserted into the detent member. It is characterized in that a plastically deformed portion formed by plastically deforming a part of the coupling metal member by the projection by pressing the coupling metal member is fitted into the coupling groove. And

Here, as the detent member of the present invention, a knock pin,
A key or the like that is inserted in the axial direction so as to engage with both the movable blade main body and the holder can be adopted.

There are various methods for fitting and inserting the movable blade main body into the holding hole of the holder in the present invention, and for example, room temperature press-fitting, shrink fitting and the like can be adopted.

Further, as a mechanism for moving the movable blade in the operating device of the present invention, for example, a striking mechanism such as an air hammer or a crank mechanism can be employed.

[Action]

In order to assemble the movable blade main body and the holder of the present invention, first, the movable blade main body is fitted and inserted into the holder, and a detent member is inserted into a boundary portion between the two members and temporarily joined, and the ring of the temporarily joined body is formed. The joining metal member is inserted into the groove, and is pressed by a press mold. Then, a part of the coupling metal member is plastically deformed by the projection integrally formed on the edge of the coupling groove,
The plastically deformed portion flows into the circumferentially extending concave groove and fits into the portion, whereby the movable blade main body is held by the holder without moving in the axial direction.

It should be noted that the joining method of the present invention is characterized in that the joining metal member is formed integrally with the joined component itself such as the movable blade main body and the holder and the joining metal member is plastically deformed by a projection (corresponding to a press-type punch). In order to distinguish it from the conventional metal flow method, it is described as a work punch type metal flow method.

As described above, in the present invention, since the movable blade main body and the holder are engaged by the detent member, rotation of the movable blade main body can be prevented. Here, since the detent member has a structure to be inserted in the axial direction, there is a concern that the detent member may come off due to the vibration of the movable blade as it is. In the present invention, since the connecting metal member faces the detent member, the member also functions as a stopper for the detent member.

In addition, since the movable blade body and the holder are joined by the metal flow method in which the plastically deformed portion of the joining metal member flows into and fits into the concave groove extending in the circumferential direction, the movable blade body can be securely removed from the holder. Can be prevented.

Further, in the present invention, since the deformation resistance is smaller than that of the movable blade main body and the holder and the two members and the separate metal member for connection are adopted, both members having high hardness can be connected by the metal flow method.

Further, in the present invention, the work punch system is employed in which the metal member for connection is plastically deformed by the protrusion integrally formed on the movable blade main body and the holder, so that the conventional pressurized type convex portion is elongated. No crack problem,
Therefore, the w / d ratio can be freely set, and the bonding strength can be greatly improved from this point, and the pressing trace does not become deep.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 4 are views for explaining a movable blade main body holding structure of a percussion type cutting machine according to an embodiment of the present invention. The structure of this embodiment has basically the same structure as the above-described conventional device except for the movable blade and the stopper head of the cutting length setting unit. Therefore, the movable blade and the stopper head will be described below.

In the figure, reference numeral 20 denotes a movable blade, which is a movable blade body 21.
And a holder 22 for holding the same. The movable blade body 21 is, for example, a disk made of SKH9 (hardness HRC60), and its radius is slightly larger than the stroke S of the movable blade 20. A through hole 21a into which the workpiece W is inserted is formed in the axis of the movable blade main body 21, and the fixed blade side end thereof is a cutting blade 21g. A relief groove 21b is formed in a U-shape on the back side (opposite the cutting blade side) of the movable blade main body 21. Reference numeral 21c is a guide hole formed in a tapered shape having a larger diameter toward the rear side after the through hole 21a, and is for guiding to the back side of the cut work. Each corner portion of the movable blade main body 21 except for the cutting blade 21g is rounded to a radius of about 1 to 3 mm. This is to avoid stress concentration.

The holder 22 is, for example, a rectangular flat plate made of SKD61 (hardness HRC46). A circular holding hole 22a is formed at the axis thereof, and a convex portion 22b that is hit by a hitting device is formed at an upper edge thereof. I have. The movable blade main body 21 is fitted and held in the holding hole 22a of the holder 22 by press fitting at room temperature. Since the holding hole 22a has a circular shape without a notch, it is in contact with the movable blade main body 21 over the entire circumference.

And at the boundary between the movable blade main body 21 and the holder 22,
The knock pin 32 is inserted in the axial direction. The knock pin 32 is locked over both the movable blade main body 21 and the holder 22, thereby performing the function of preventing the movable blade main body 21 from rotating. Further, a portion of the boundary portion outside the knock pin 32 is connected to each other by a so-called work punch type metal flow method via a connection ring 23 made of, for example, S45C. The coupling ring 23 faces the knock pin 32, and also functions to prevent the knock pin 32 from coming off. This connection method has been developed by the present inventors (see Japanese Patent Application No. 1-21030), and the connection portion will be described in detail below.

The connecting portion of the movable blade body 21 and the holder 22 has a connecting ring 2
In order to form an annular groove 24 into which the second groove 2 is inserted, annular step portions (outer and inner peripheral surfaces) 21h and 22h are formed.
4 is largely shifted toward the holder 22 side. Note that this annular groove 2
4 may be shifted toward the movable blade main body 21 side, or may be positioned at the center of both. In addition, V-shaped coupling grooves 21d and 22d are formed on the side surfaces of the steps 21h and 22h over the entire circumference in three rows. Projections 21f, 22f are integrally formed on the axial inner edges of the steps 21h, 22h. The shape and the number of rows of the concave grooves 21d and 22d are not limited to the V-shape and three rows.

The plastically deformed portion 23a of the coupling ring 23 is fitted into the coupling grooves 21d and 22d, whereby the movable blade body 21 and the holder 22 are coupled.

In assembling the movable blade 20, first, the movable blade body 21 and the holder 22 described above are prepared, and the movable blade body 21 is
Press-fit at room temperature into the second holding hole 22a. And the two members 21, 2
The dowel pin 32 is inserted into the pin hole 32a formed at the boundary between the two from the annular groove 24 side.

Next, the press-fit coupling body is placed on the lower mold 30 so that the side of the annular groove 24 faces upward, and is set.
A coupling ring 23 is fitted and inserted into 24, and its lower end surface 23b is brought into contact with both of the projections 21f, 22f. Then, the coupling ring 23 is further pressed by the protrusion 31a of the upper die 31 and is lowered. Then, the outer peripheral edge and the inner peripheral edge portion of the lower end face 23b are prevented from descending by the projections 21f and 22f, so that they are plastically deformed, and the plastically deformed portions 23a flow into the coupling grooves 21d and 22d. Thereby, the movable blade main body 21 and the holder 22 are connected.

Here, since the annular groove 24 is eccentric toward the holder 22, the inner peripheral surface of the relief groove 21 b of the coupling ring 23 substantially matches the inner peripheral surface of the holding hole 22 a of the holder 22.
On the other hand, when the annular groove is decentered toward the movable blade main body 21, the portion protrudes inward from the inner peripheral surface of the holding hole 22a. In this case, the relief groove portion of the coupling ring 23 is cut and removed. This is advantageous in securing the length of the relief groove by the amount of the stroke.

25 is a stopper head, the tip of which is partially cut off on the upper side. As a result, the height as viewed in the moving direction of the movable blade is about 1/3 of the stopper head 13 in the above-described conventional example. Thus, the striking stroke can be secured only by the relief groove 21b of the movable blade main body 21, and it is not necessary to provide a relief groove in the holder 22, which is advantageous in strength.

 Next, the operation and effect of this embodiment will be described.

In the present embodiment, since the knock pin 32 is inserted at the boundary between the movable blade main body 21 and the holder 22, the rotation of the movable blade main body 21 can be reliably prevented while using room temperature press-fitting having a relatively small coupling force.

Also, on the outer side in the axial direction from the knock pin at the boundary,
Since the annular groove 24 having the circumferential grooves 21d and 22d was formed, and the plastic deformation portion of the coupling ring 23 was flow-fitted into the groove, the axial movement of the movable blade main body 21 could be prevented, and the movable blade The main body 21 can be reliably prevented from coming off. And this coupling ring 23
Is opposed to the knock pin 32 and can also function to prevent the knock pin 32 from coming off.

Further, in the present embodiment, the method using the coupling ring 23 which is a separate component having a smaller deformation resistance than the movable blade body 21 and the holder 22 is adopted, so that the movable blade body 21 and the holder 22 both having high hardness are used.
Can be combined by a metal flow method.

In this case, the work punch method in which the coupling ring 23 is plastically deformed by the protrusions 21f and 22f formed integrally with the movable blade body 21 and the holder 22 is employed. There is almost no restriction on the / d ratio, so that the coupling strength can be greatly increased. In addition, since the entire surface of the coupling ring 23 is pressurized by the upper mold 31, the press mark does not become deep.

〔The invention's effect〕

As described above, according to the movable blade main body holding structure of the cutting machine according to the present invention, since the detent member is provided at the boundary between the movable blade main body and the holder, regardless of the magnitude of the fitting force between the two members. The movable blade main body can be prevented from rotating, and the outside of the detent member at the above boundary is joined by a work punch type metal flow method using a separate part. Has the effect of being able to reliably prevent the slipping out of the coupling ring, and has the effect that the coupling ring can also be used to prevent the rotation preventing member itself from slipping out.

[Brief description of the drawings]

1 to 4 are views for explaining a movable blade main body holding structure of a percussion type cutting machine according to a first embodiment of the present invention. FIG. 1 is a sectional side view of the movable blade, and FIG. FIG. 3 is a rear side view, FIG.
4 (a) and 4 (b) are enlarged sectional views of the connecting portion, FIGS. 5 to 7 are views showing a conventional example, FIG. 5 is a sectional front view of a percussion type cutting machine, and FIG. FIG. 7 is a sectional side view of the movable blade, FIG. 7 is a rear view thereof, and FIGS. 8 (a) and 8 (b) are sectional views for explaining a conventional metal flow method. In the figure, 1 is a percussion type cutting machine, 3 is a fixed blade, 3a is a guide hole, 7 is a percussion device (actuating device), 20 is a movable blade, 21 is a movable blade main body, 21a is a through hole, and 21d and 22d are concave. Grooves, 21f and 22f are protrusions, 21h and 22h are steps (annular groove configuration surface), 22 is a holder, 2
2a is a holding hole, 23 is a coupling ring (metal member for coupling), 23a
Is a plastically deformed portion, 24 is an annular groove, 25 is a stopper bed (positioning member), 32 is a knock pin (rotation stop member), and W is a work (material to be cut).

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-107799 (JP, A) JP-A-55-122634 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23D 35/00

Claims (1)

(57) [Claims] 1. A holder having a fixed blade having a guide hole into which a material to be cut is inserted and a movable blade body having a through-hole into which a tip extending from the guide hole of the material to be cut is inserted. A movable blade disposed so as to be movable in a direction perpendicular to the material to be cut, and a positioning member which is inserted into the movable blade main body so as to face the tip of the material to be cut, and defines a cutting length,
A cutter for moving the movable blade in a direction perpendicular to the material to be cut and an actuator for regulating the movement of the movable blade to a predetermined stroke, wherein the movable blade body is held by a holder. The movable blade main body is fitted and inserted into the holding hole of the holder, and an annular groove extending in the fitting direction and having an open end is formed at a boundary between the movable blade main body and the holder. Forming a coupling concave groove extending in the circumferential direction on each of the outer peripheral surface of the movable blade main body and the inner peripheral surface of the holder constituting the annular groove, and forming an edge of the coupling groove on the bottom side of the annular groove. The outer peripheral surface and the inner peripheral surface are formed with projections each having a larger diameter and a smaller diameter than the inner peripheral surface. Insert the stop member from the annular groove side, and Inserting a coupling metal member having smaller deformation resistance than the movable blade main body and the holder into the annular groove so as to oppose the detent member, and pressing the coupling metal member to partially remove the coupling metal member. A movable blade main body holding structure for a cutting machine, characterized in that a plastically deformed portion formed by plastically deforming a projection is flow-fitted into the coupling groove.