JPH028648Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a lower blade holder that is placed and fixed on a support stand that is fixed to the work table of the frame, and a cap that is swingably provided on the support stand. It has a cylindrical lower blade that protrudes through and restrains the cutting material, and a flat upper blade that is attached to a ram that is driven up and down via a tool post and that is moved up and down while in contact with the front surface of the cylindrical lower blade, The present invention relates to a cutting device that uses a cylindrical lower blade and a flat upper blade to cut a workpiece protruding from a cylindrical lower blade.

B. Prior Art This type of restraint 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 the weight error of the material to be cut is small.
That is, as shown in FIG. 1, in this cutting device, a cylindrical lower blade 2 is clamped and fixed between a lower blade holder 3 and a cap 4, and a flat upper blade 5 is attached to a tool rest 6.
is placed in contact with the front surface of the cylindrical lower blade 2 so as to be able to move up and down, and a stopper 7 is provided in front of the cylindrical lower blade 2 to set the cutting dimension of the material 1 to be cut. It is introduced from the rear into the cylindrical lower blade 2 and projects through it, and its tip is brought into contact with the stopper 7, and in this state the flat upper 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 7 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.Moreover, since the support rigidity of the cylindrical lower blade 2 is low, the lower cylindrical blade 2 also causes inclination, so the material to be cut 1 is insufficiently restrained, its parallelism collapses, and the contact state between the cylindrical lower blade 2 and the flat upper blade 3 becomes poor, making it difficult to maintain high cutting accuracy. It is difficult, and the cylindrical lower blade 2 is damaged due to the strong impact during cutting.
I had a problem with the unit rattling and making a lot of noise.

(b) Purpose of the invention This invention increases the support rigidity of the cylindrical lower blade to prevent the cylindrical lower blade from tilting during cutting, thereby ensuring the restraint of the material to be cut, suppressing its bouncing up, and improving precision. It is an object of the present invention to provide a cutting device which is improved and has reduced noise upon impact.

C. Structure of the device This device is clamped and fixed by a lower blade holder 22 placed and fixed on a support 14 fixed to a work table 12 of a frame 10 and a cap 23 swingably provided on the support 14. , a cylindrical lower blade 20 that protrudes through and restrains the material 1 to be cut, and a flat blade that is attached to the ram 13, which is driven vertically, via a tool rest 15, and that is moved up and down while in contact with the front surface of the cylindrical lower blade 20. A cylindrical lower blade 20 is provided at the lower front surface of a lower blade holder 22 that supports the cylindrical lower blade 20.
Support protrusions 25, 25 protruding forward from the front end surface of
are integrally formed in two parallel fork shapes, and the support protrusions 25, 25 are supported by the support base 14.

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 extending in a gate shape so as to straddle the material to be cut 1 are integrally formed on both sides of the front portion of the mounting seat 16.

Reference numeral 18 denotes a flat blade attached to the tool rest 15, the upper end of which is brought into close contact with the mounting seat 16, and the back surface of the non-cutting side, for example both front sides, is brought into close contact with the pressure receiving parts 17, 17, and is firmly secured with the mounting bolts 19. It is installed on.

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, two supporting protrusions 25, 25 protruding forward in a fork shape integrally formed in parallel on both sides of the lower front surface, and a circular portion on the upper surface. An arc-shaped fitting groove 26 is formed, and the rail portion 24 is connected to the rear end vertical wall portion 2.
Support pillars 28, 28 are slidably fitted into the rail grooves 27 formed in 1 and are mounted so as to be slidable in the width direction, and support protrusions 25, 25 are formed on both front sides of the rear end vertical wall part 21. The lower half of the cylindrical lower blade 20 is held by the fitting groove 26. Further, the cap 23 has an arcuate fitting groove 29 formed on its lower surface, and a cutout groove 30 formed at one end. The other end of the cap 23 is pivotally attached to the upper end of a support groove 31 formed in the inner part of the support base 14, and after the cap 23 is placed over the upper surface of the cylindrical lower blade 20, the lower blade 20 is supported. The upper end of the tightening bolt 33, which is swingably supported by the base 14 on the pivot 32, is inserted into the notch groove 30 of the cap 23, and the tightening member 34 and nut 35 are tightened to connect the lower blade holder 22 and the cap. 23 and clamp and fix the cylindrical lower blade 20. Furthermore, when this is fixed,
The front end surface of the cylindrical lower blade 20 is arranged to be the same as or slightly protrude from the front end surface of the lower blade holder. 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 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 lower end of the flat upper blade 18 escapes to the upper side of the cylindrical lower blade 20. At the point, the lower end of the flat upper blade 18 is the cylindrical lower blade 2.
It is set to be below 0.

Reference numeral 36 denotes a back-up member provided at the rear of the cylindrical lower blade 20, which has a hat-shaped cross section and a cylindrical shape.
A guide hole 37 is bored in the center of the tip, and an annular engagement protrusion 38 that fits with the cylindrical lower blade 20 is integrally formed around the entire circumference, and a male screw 39 is carved on the outer peripheral surface. A positioning bolt 40 is screwed into the rear end flange portion 36a. This back-up member 36 is screwed into a female screw hole 41 formed in the rear end vertical wall portion 21 of the support base 14, and is inserted into the engaging protrusion 3 at the tip.
8 is fitted and engaged with the rear end outer peripheral surface of the cylindrical lower blade 20, and its tip surface is brought into contact with the rear end surface of the cylindrical lower blade 20. After that, the positioning bolt 40 is tightened, and the tip is attached to the support base 14. The backup member 36 is positioned so as to come into contact with the rear end surface of the rear end vertical wall portion 21. A material guide 42 is fitted and fixed to the inner peripheral surface of the back-up member 36, and guides the material 1 to be cut to the cylindrical lower blade 20.

Guide members 43, 43 are integrally attached to the rear ends of intermediate walls 44, 44 formed on both sides of the intermediate portion of the support base 14, and are formed in an inverted L shape, and have smooth rear end surfaces 43a, 43a. It is formed on a vertical surface. These guide members 43, 43 are connected to the rear end surface 43.
a, 43a guide and press the pressure receiving parts 17, 17 of the tool post 15 via the spacers 45, 45, thereby applying a load acting on the flat blade 18 during cutting.

46 is a stopper disposed in front of the cylindrical lower blade 20, and 47 is a holder that holds the stopper 46. The holding body 47 has a slide hole 48 formed at the rear and recesses 49 and 50 at the front and rear ends.A rear end flange 52 of an adjustment shaft 51, which will be described later, is inserted into the front end recess 50 and coupled to the front end. The lid body 53 prevents the lid body from coming off and is connected to allow relative rotation.
Also, the stopper 4 is inserted into the slide hole 48 of the holding body 47.
The spring 5 is slidably inserted into the tip shaft portion 46a of the slide hole 46 and prevented from coming off by the tip flange 46b.
4, the stopper 46 is pressed rearward. The stopper 46 is held so as to be slightly movable in the axial direction with respect to the holder 47, and is pushed by the material to be cut 1.
When it enters the rear end recess 49 of the holder 47, a cutting start signal is generated as described later.

That is, an air groove 55 is formed on the outer circumferential surface of the tip shaft portion 46a of the stopper 46, and air ports 56 and 57 are formed in the holder 47 at positions slightly shifted forward in the axial direction from the air groove 55. The air port 56 is connected to an air supply source (not shown), the other air port 57 is connected to a pressure sensitive switch (not shown), the stopper 46 enters the holder 47, and the air groove 55 connects to the air port. 56 and 57, air is supplied from the air supply source to the pressure-sensitive switch, and the pressure-sensitive switch is turned on to issue a cutting start signal. When the stopper 46 returns, the pressure sensitive switch
It becomes OFF.

Reference numeral 58 denotes an air passage through which air flows in and out of the slide hole 44 of the holder 47 as the stopper 46 moves back and forth.

Note that the holder 47 is attached to the intermediate wall 4 of the support base 14.
It is placed between 4 and 44 and moves back and forth guided by this.

The adjustment shaft 51 has a male thread 59 carved on its circumferential surface,
Further, splines 60, 60 are formed in the axial direction at, for example, two opposing locations on the circumferential surface. This adjustment shaft 5
1 is screwed into a female screw member 62 that is fitted and fixed to the front end vertical wall portion 61 of the support base 14. Therefore, the adjustment shaft 51 moves back and forth by rotating, and adjusts the position of the stopper 46. Reference numeral 63 designates a bearing provided on the front end vertical wall portion 61 of the support base 14, and its inner ring 63a is coupled to the adjustment shaft 51 via a key 64.
Reference numeral 65 denotes a driven gear coupled to the inner ring 63a of the bearing 63. When the driven gear 65 rotates, the adjustment shaft 51 rotates via the inner ring 63a and the key 64.

Reference numeral 66 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 61 of the support base 14, and its output shaft 6
A driving gear 67 is coupled to 6a, and the driving gear 67 is meshed with the driven gear 65. Further, the drive gear 67 is provided with an appropriate control means (not shown) that detects the rotation angle of the drive gear 67 and adjusts the amount of movement of the adjustment shaft 51 based on this.

To explain the cutting operation in the cutting device having the above configuration, first, the drive motor 66 is rotated in the forward or reverse direction, and the adjustment shaft 51 is rotated in the forward or reverse direction via the drive gear 67, the driven gear 65, and the inner ring 63a of the bearing 63. The adjustment shaft 51 is rotated, and the adjustment shaft 51 is moved forward or backward by a predetermined distance by the screwing relationship between the adjustment shaft 51 and the female screw member 62, and the dimension between the stopper 46 and the cylindrical lower blade 20 is adjusted to the cutting length of the material 1 to be cut. . When the cutting length is set, the material to be cut 1 is introduced into the cylindrical lower blade 20 from the material guide 42 and the backup material 36,
Furthermore, it is made to protrude from the cylindrical lower blade 20 and its tip is brought into contact with the stopper 46. When the stopper 46 is pushed into the holder 47 by the material 1 to be cut, the feeding of the material 1 to be cut is stopped, and at the same time, the air groove 55 formed in the stopper 46 and the air groove 55 formed in the holder 47 are Ports 56 and 57 communicate,
The pressure sensitive switch turns ON and issues a signal to start cutting. Then, the ram 11 descends, lowers the flat upper blade 18, and cuts the workpiece 1 between it and the cylindrical lower blade 20. The cut material is discharged to the outside through a discharge chute 13 provided below 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 46. Thereafter, the above-described operations are repeated to cut the material 1 to be cut into the set dimensions.

Also, when changing the cutting length of the material to be cut 1,
The drive motor 66 is operated to rotate the drive gear 67 forward or backward by a predetermined angle, thereby advancing or retracting the adjustment shaft 51 by a predetermined amount, and the stopper 46 is rotated.
What is necessary is to adjust the dimensions of the lower cylindrical blade 20 and the lower cylindrical blade 20.

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,
The back-up member 36 is attached to the rear end vertical wall portion 21 of the support base 14 to eliminate the dimensional error of the cylindrical lower blade 20 due to the polishing.
Correction can be made by screwing it in and moving it forward to make the cylindrical lower blade 20 protrude.

E. Effects of the invention In this invention, a support protrusion is formed at the lower front of the lower blade holder that loads the compressive load acting on the cylindrical lower blade during cutting, and this support protrusion is supported by the support base. Even if a large load is applied from the end face of the cylindrical lower blade, the lower blade holder and the cylindrical lower blade will not tilt due to the support protrusion, and the cylindrical lower blade will be maintained in its normal state.
The contact between the cylindrical lower blade and the flat upper blade is good, resulting in a beautiful cut surface of the material being cut, improving cutting accuracy, and preventing rattling of the cylindrical lower blade, thereby alleviating the impact during cutting and reducing noise. can be lowered.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the principle of restraint cutting, Fig. 2 is a sectional view of the cutting device according to the present invention, Fig. 3 is a side view thereof, Fig. 4 is a plan view, and Fig. 5 is a lower blade holder. FIG. 1... Material to be cut, 10... Frame, 12...
Work table, 14...Support stand, 15...Turret rest, 18...Flat upper blade, 20...Cylindrical lower blade, 22...
... lower blade holder, 23 ... cap, 24 ... rail section, 25 ... support protrusion, 28 ... pillar.

Claims (1)

[Scope of utility model registration request] The lower blade holder is placed and fixed on a support stand fixed to the work table of the frame, and the lower blade holder is clamped and fixed by a cap swingably provided on the support stand, and the material to be cut is protruded through and restrained and supported. It has a cylindrical lower blade and a flat upper blade that is attached to a ram that is driven up and down via a tool post and is moved up and down while in contact with the front surface of the cylindrical lower blade, and cuts the material to be cut that protrudes from the cylindrical lower blade. In a cutting device that cuts with a cylindrical lower blade and a flat upper blade, two fork-shaped support protrusions projecting forward from the front end surface of the cylindrical lower blade are provided at the lower front surface of the lower blade holder that supports the cylindrical lower blade. A cutting device characterized in that the supporting protrusion is integrally formed in parallel and supported by a support stand.