JPH0314267Y2 - - Google Patents

Description

[Detailed description of the device] This device has a cylindrical lower blade that protrudes through and restrains the material to be cut, and a flat upper blade that moves up and down while in contact with the front surface of the cylindrical lower blade. The present invention relates to a cutting device that cuts a workpiece protruding from a blade by the intersecting movement of a cylindrical lower blade and a flat upper blade.

B. Prior Art This type of restraint-type cutting device restrains the material to be cut (bar material) with the cylindrical lower blade during cutting, so the cutting accuracy is very high and there is little error in the weight of the material to be cut. That is, as shown in FIG. 1, in this cutting device, a cylindrical lower blade 2 is held by a lower blade holder 3 and a cap 4, and a flat upper blade 5 is provided in front of the cylindrical lower blade 2 so as to be movable up and down. , and a stopper 6 is provided in front of the cylindrical lower blade 2 to set the cutting dimension of the material to be cut 1.The material to be cut 1 is introduced into the cylindrical lower blade 2 from the rear and protrudes through the cylindrical lower blade 2, and its tip is The flat blade 5 is brought into contact with the stopper 6, and in this state, the flat blade 5 is lowered to perform cutting.

In this way, in the above-mentioned cutting device, the material to be cut 1 is restrained by the cylindrical lower blade 2, and the material to be cut 1' is held in parallel by the stopper 6 from the start of cutting to the end of cutting. The cutting process is much more beautiful and has higher precision than conventional cutting using flat blades.

However, the above-mentioned cutting device has an edge 2a at the lower front end of the cylindrical lower blade 2 and an edge 5 at the lower rear end of the flat upper blade 5.
Since the material to be cut 1 is sheared with a,
During cutting, a large moment load and compressive load act on the material to be cut 1 and the cylindrical lower blade 2, causing the material to be cut 1 to jump up and applying a large impact to the cylindrical lower blade 2, which may cause noise and damage to the cylindrical lower blade. There was a problem that the durability of the blade 2 deteriorated. Furthermore, since the cylindrical lower blade 2 is tilted due to the impact, the material to be cut 1 is insufficiently restrained, which is an impediment to improving cutting accuracy.

Therefore, in order to suppress the jump of the material 1 to be cut during cutting and to alleviate the impact, the length of the cylindrical lower blade 2 in the axial direction may be increased, but the cylindrical lower blade 2 has a small part that is involved in cutting. Moreover, if the edge 2a wears out, it is difficult to replace it, and since the cylindrical lower blade 2 is made of an expensive material, the equipment cost is high. Therefore, conventionally, the cylindrical lower blade 2 is shortened, and a cylindrical back-up member 7 is provided behind the cylindrical lower blade 2, so that the back of the material 1 to be cut is restrained by the back-up member 7.

By configuring as described above, it is possible to suppress the material to be cut 1 from jumping up, but the supporting rigidity of the cylindrical lower blade 2 against the compressive load is weak, making it impossible to suppress noise, and also preventing the material to be cut 1 from being restrained. There was a problem that was said to be insufficient.

(b) Purpose of the invention This invention is a cutting device that increases the support rigidity of the cylindrical lower blade to ensure the restraint of the cylindrical lower blade and the material to be cut, suppresses their jumping up, reduces noise, and improves cutting accuracy. We aim to provide the following.

C. Structure of the device This device includes a cylindrical lower blade 20 that penetrates and protrudes through the material to be cut to restrain and support it, and a flat upper blade 18 that is driven up and down while in contact with the tip of the cylindrical lower blade 20 to cut the material to be cut 1. , a cylindrical back-up member 32 that is arranged behind the cylindrical lower blade 20 and backs up the cylindrical lower blade 20, the back-up member 32
A large diameter engagement protrusion 34 is integrally formed at the tip of the
The engagement protrusion 34 is fitted onto the outer periphery of the rear end of the cylindrical lower blade 20, engaged and fixed, and the back-up member 3
2 restrains the cylindrical lower blade 20 and the material to be cut 1.

D. Embodiment FIGS. 2 to 4 are drawings showing an embodiment of the present invention. In the figures, 10 is a frame of a cutting device, inside which is a drive mechanism (not shown) for vertically driving the ram 11. A discharge chute 13 is formed in the front part of the work table 12 to discharge cutting material. 14 is work table 1 of frame 10
It is a support stand fixedly installed on 2. 15 is Ram 11
The turret is attached to the bottom of the turret.
A mounting seat 16 is formed that protrudes downward over the entire width, and pressure receiving portions 17, 17 are integrally formed on both sides of the front part of the mounting seat 16, extending in a gate shape so as to straddle the material to be cut 1. A flat blade attached to the tool rest 15, with its upper end in close contact with the mounting seat 16,
Moreover, both front sides are brought into close contact with the pressure receiving parts 17, 17, and are firmly attached with mounting bolts 19.

Reference numeral 20 denotes a cylindrical lower blade provided on the rear end vertical wall portion 21 of the support base 14, and is fixed by a lower blade holder 22 provided at the front portion of the rear end vertical wall portion 21 and a cap 23. The lower blade holder 22 has a rail portion 24 formed in the width direction on the lower surface, and the rail portion 24 is connected to the rear end vertical wall portion 2.
The lower blade 20 is slidably fitted into a rail groove 25 formed in the lower blade 1 and is mounted so as to be slidable in the width direction, and the upper surface is formed into an arc shape to support the cylindrical lower blade 20. The cap 23 has one end pivotably attached to the upper end of a support rod 26 formed in the inner part of the support base 14, and has a cutout groove 27 formed at the other end. After the cap 23 is placed on the upper surface of the cylindrical lower blade 20, the upper end of the tightening bolt 29, which is swingably supported on the support base 14 by a pivot 28, is inserted into the notch groove 27 of the cap 23 and tightened. Tighten the attachment member 30 and nut 31, and attach the lower blade holder 22 and cap 23 to the cylindrical lower blade 2.
Fix 0. When replacing the cylindrical lower blade 20, the cap 23 is opened and the lower blade holder 22 is pulled out and replaced.

The flat upper blade 18 and the cylindrical lower blade 20 are arranged so as to make a cross movement while being in contact with each other, and at the top dead center of the ram 11, the lower end of the flat upper blade 18 escapes above the cylindrical lower blade 20, and the bottom dead The point is set so that the lower end of the flat upper blade 18 is located below the cylindrical lower blade 20.

Reference numeral 32 denotes a back-up member provided at the rear of the cylindrical lower blade 20, which has a hat-shaped cross section, has a guide hole 33 in the center of its tip, and has an annular shape that fits with the cylindrical lower blade 20 around the entire circumference. engaging protrusion 34 of
are integrally formed, and a male thread 35 is carved on the outer peripheral surface, and a positioning bolt 36 is provided on the rear end flange portion 32a.
is screwed in. This back-up member 32 is screwed into a male screw hole 37 formed in the vertical wall portion 21 at the rear end of the support base 14, and is engaged by fitting the engagement protrusion 34 at the tip to the outer peripheral surface of the cylindrical lower blade 20. At the same time, the tip end surface is brought into contact with the rear end surface of the cylindrical lower blade 20, and then the positioning bolt 36 is tightened and the tip end is brought into contact with the rear end surface of the rear end vertical wall portion 21 of the support base 14, and the back up member 32 is moved. Position. Reference numeral 38 denotes a material guide fitted to the inner circumferential surface of the back-up member 32, which guides the material to be cut 1 to the cylindrical lower blade 20.

Guide members 39, 39 are integrally attached to the rear end portions of intermediate walls 40, 40 formed at the intermediate portion of the support base 14, and are formed in an inverted L shape, and the rear end surface 39
a, 39a are formed on smooth vertical surfaces. The guide members 39, 39 guide the pressure receiving parts 17, 17 of the tool rest 15 through the spacers 41, 41 at the rear end surfaces 39a, 39a, and press them to generate a reaction force acting on the flat blade 18 during cutting. Load.

42 is a stopper disposed in front of the cylindrical lower blade 20, and 43 is a holder that holds the stopper 42. The holding body 43 has a slide hole 44 formed at the rear and recesses 45 and 46 at the front and rear ends.A rear end flange 48 of an adjustment shaft 47, which will be described later, is inserted into the front end recess 46 and coupled to the front end. The lid body 49 prevents the lid body from coming off and is connected to allow relative rotation.
Also, the stopper 42 is inserted into the slide hole 44 of the holding body 43.
The spring 50 is slidably inserted into the tip shaft portion 42a and prevented from coming off by the tip flange 42b, and is compressed and interposed in the front part of the slide hole 44.
The stopper 42 is pressed backward. The stopper 42 is held so as to be slightly movable in the axial direction with respect to the holder 43, and is pushed by the material 1 to be cut, so that the stopper 42 is moved into the rear end recess 4 of the holder 43.
5, a cutting start signal is generated as described later.

That is, an air groove 51 is formed on the outer peripheral surface of the tip shaft portion 42a of the stopper 42, and air ports 52 and 53 are formed in the holder 43 at positions slightly shifted from the air groove 51 in the axial direction. When the air port 52 is connected to an air supply source (not shown) and the other air port 53 is connected to a pressure sensitive switch (not shown), and the stopper 42 enters the holder 43, the air groove 51 opens. communicates with air ports 52 and 53,
Air from the air supply source is introduced into a pressure sensitive switch, which is turned on to issue a signal to start cutting. When the stopper 42 returns, the pressure sensitive switch is turned off.

Reference numeral 54 designates an air passage through which the air in the slide hole 44 of the holder 43 flows out as the stopper 42 moves back and forth.

Note that the holder 43 is attached to the intermediate wall 4 of the support base 14.
It is placed between 0 and 40 degrees and moves back and forth guided by it.

The adjustment shaft 47 has a male thread 55 carved on its circumferential surface, and splines 56, 56 are formed in the axial direction at, for example, two opposing locations on the circumferential surface. This adjustment shaft 24
is screwed into a male screw member 58 fixed to the front end vertical wall portion 57 of the support base 14. Therefore, the adjustment shaft 24
moves back and forth by rotating, and the stopper 42
Adjust the position. Reference numeral 59 denotes a bearing provided on the front end vertical wall portion 57 of the support base 14, and has an inner ring 59a coupled to the adjustment shaft 24 via a key 60. Reference numeral 61 denotes a driven gear coupled to the inner ring 59a of the bearing 59. When the driven gear 61 rotates, the adjustment shaft 24 rotates via the inner ring 59a and the key 60.

Reference numeral 62 denotes a drive motor that is rotatable in forward and reverse directions and is provided on the upper surface of the front end vertical wall portion 57 of the support base 14, and its output shaft 6
A driving gear 63 is coupled to 2a, and the driving gear 63 is meshed with the driven gear 61. Further, the drive gear 63 is provided with an appropriate control means (not shown) that detects the rotation angle of the drive gear 61 and adjusts the amount of movement of the adjustment shaft 24 based on this.

To explain the cutting operation in the cutting device having the above configuration, first, the drive motor 62 is rotated forward or backward, and the drive gear 63, the driven gear 61, and the inner ring 5 are rotated forward or backward.
The adjustment shaft 24 is rotated forward or backward through the screw 9a, and the adjustment shaft 24 is moved forward or backward by a predetermined distance due to the screwing relationship between the adjustment shaft 24 and the female screw member 58, and the distance between the stopper 42 and the cylindrical lower blade 20 is adjusted. Adjust the dimensions to the cutting length of the material to be cut 1. Once the cutting length is set,
The material to be cut 1 is introduced into the cylindrical lower blade 20 through the material guide 38 and the backup member 32, and is further projected from the cylindrical lower blade 20 so that its tip abuts against the stopper 42. When the stopper 42 is pushed into the material 1 to be cut and enters the holder 43, the feeding of the material 1 to be cut is stopped, and at the same time, the air groove 51 formed in the stopper 42 and the air port formed in the holder 43 are 52 and 53 communicate, and the pressure sensitive switch
Turns ON and issues a cutting start signal. Then, the ram 11 descends, lowers the flat upper blade 18, and cuts the material 1 between it and the cylindrical lower blade 20. The cut material is discharged through a discharge chute 13 provided under the work table 12 of the frame 10.

After cutting is completed, as the ram 11 rises, the flat blade 1
8 is raised, the material to be cut 1 is fed, and the material to be cut 1 protrudes from the cylindrical lower blade 20 and comes into contact with the stopper 42. Thereafter, the above-described operations are repeated to cut the material 1 to be cut into predetermined dimensions.

When changing the cutting length of the material 1 to be cut, the drive motor 62 is rotated forward or backward by a predetermined angle, thereby moving the adjustment shaft 24 forward or backward to adjust the dimensions between the stopper 42 and the cylindrical lower blade 20. do it.

In addition, when the end face of the cylindrical lower blade 20 is worn out due to repeated cutting, the end face of the cylindrical lower blade 20 is polished, and the back-up member 32 is attached to the rear end vertical wall of the support base 14 to eliminate the dimensional error of the cylindrical lower blade 20 due to the polishing. The correction can be made by screwing it into the cylindrical lower blade 21 and moving it forward to make the cylindrical lower blade 20 protrude.

E. Effects of the invention This invention allows the rear end of the cylindrical lower blade for cutting the material to be cut to be engaged with and held by the engaging protrusion formed on the end surface of the back-up member that is firmly held on the support stand. As a result, the cylindrical lower blade is firmly held by the lower blade holder and the cap, and the rear end, which is subject to strong reaction force, is held by the back-up member, which improves the adhesion between the two and also reduces the back-up to the cylindrical lower blade. The force is also improved, which improves the support rigidity of the cylindrical lower blade, suppresses the bouncing up of the cylindrical lower blade and the material to be cut during cutting, and improves cutting accuracy by making the cut surface of the material more beautiful. It has excellent impact resistance, extends the life of the cylindrical lower blade, improves cutting ability, and suppresses noise during cutting.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the principle of restraint cutting, FIG. 2 is a sectional view of a cutting device according to the present invention, FIG. 3 is a side view thereof, and FIG. 4 is a plan view. 1... Material to be cut, 14... Support stand, 18... Flat upper blade, 20... Cylindrical lower blade, 22... Lower blade holder, 2
3...Cap, 32...Backup member, 3
4... Engaging protrusion, 42... Stopper.

Claims (1)

[Scope of utility model registration request] A cylindrical lower blade that protrudes through and restrains the material to be cut, and is driven up and down while in contact with the tip of the cylindrical lower blade, and cuts the material protruding from the cylindrical lower blade in cooperation with the cylindrical lower blade. In a cutting device consisting of a flat upper blade, a cylindrical back-up member for restraining and backing up the material to be cut is provided behind the cylindrical lower blade, and a large-diameter engagement member is provided at the tip of the back-up member over the entire circumference. A cutting device characterized in that a mating protrusion is formed, and the engaging protrusion is fitted onto and engaged with the outer periphery of the rear end of a cylindrical lower blade.