JPS6346185Y2 - - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention (industrial application field) The shearing tool blade mounting shaft according to this invention is suitable for shearing machines used when cutting a wide metal plate into multiple strip-shaped metal plates. It is used to attach a ring-shaped cutter to the outer circumferential surface of the metal plate according to the width to be cut.

(Prior art) When cutting a wide metal plate using a shearing machine to make a plurality of strip-shaped metal plates, two
By fixing a plurality of ring-shaped blades to the outer circumferential surface of each book mounting shaft, and feeding the metal plate between the blades fixed to both mounting shafts, this metal plate is inserted between the blades that mesh with each other. Cut the board.

FIG. 1 shows a conventional blade mounting shaft for a shearing machine and a large number of ring-shaped blades fixed to the shaft.
This shearing machine cuts a wide metal plate with a width of W.
There are 20 strip-shaped metal plates having a width w. First, this conventional blade mounting shaft for a shearing machine will be explained.

First and second mounting shafts 1 and 2, which are disposed vertically and parallel to each other, are combined so that they can rotate in opposite directions at the same speed. Right end of each mounting shaft 1, 2 (up, down, left and right directions are according to the drawing. The same applies hereinafter)
A flange 3 is formed at the left end, and a male screw 4 is formed at the left end. In order to attach the ring-shaped cutters 7a and 7b to each of the mounting shafts 1 and 2, a short cylindrical first spacer 5 having a length matching the width w of the band-shaped metal plate after cutting, and this first spacer 5 Yoriyori Knife 2
A plurality of blades 7a, 7b are positioned by alternately using second spacers 6 whose length is shorter by the thickness of the blade, and the blade 7 attached to the upper mounting shaft 1
The lower edges of the blades 7a and 7a are engaged with the upper edges of the blades 7b and 7b mounted on the lower mounting shaft 2. A nut is screwed into the male screw 4 at the left end of each mounting shaft 1, 2 and tightened, and each spacer 5, 6 and cutter 7
a and 7b are tightly held between the nut 8 and the flange 3.

For this reason, when a metal plate with a width W is fed between the two shafts 1 and 2 while rotating the mounting shafts 1 and 2 in opposite directions, this metal plate is cut at the meshing part of the blades 7a and 7b, and It is assumed to be a band-shaped metal plate with a width w.

However, the conventional blade mounting shaft for a shearing machine constructed and used as described above has the following disadvantages.

That is, when changing the width for cutting a metal plate, it is necessary to change the lengths of both the first and second spacers 5 and 6 that regulate the distance between the blades 7a and 7b, which makes it difficult to cut metal plates of various widths. If this is done, many different types of spacers must be prepared.

In addition, in order to cut the metal plate smoothly, it is necessary to ensure that the blades 7a and 7b attached to the upper and lower mounting shafts 1 and 2 are properly engaged as specified. As shown in FIG.
When externally fitting the members 5, 6, 7a, and 7b, the above-mentioned engagement tends to be inappropriate due to the accumulation of dimensional errors of each member 5, 6, 7a, and 7b.

In this way, if the upper and lower blades 7a, 7b do not mesh properly, insert a thin shim plate or the like between the members 5, 6, 7a, 7b fitted onto the respective mounting shafts 1, 2. , the positions of the blades 7a and 7b are regulated, but the shim plate must be inserted before tightening the nut 8, and the position of the blade 7 after tightening the nut is
It was difficult to select a shim plate with a thickness that would allow proper meshing between a and 7b, and it was a task that required skill.

Similarly, in order to prevent dust and the like from adhering to the spacers 5 and 6 and the blades 7a and 7b, which would cause the blades 7a and 7b to be installed incorrectly, each member 5,
6, 7a, and 7b must be stored strictly, which is troublesome.

Furthermore, in order to enable the blades 7a, 7b to be externally fitted onto the mounting shafts 1, 2, each blade 7a, 7b is formed into a ring shape.
The inner diameter of 7b must be at least 0.02 to 0.03 mm larger than the outer diameter of the mounting shafts 1 and 2, and the center of each blade 7a and 7b and the center of each mounting shaft 1 and 2 must be It is unavoidable that there will be a difference. When the centers of the blades 7a, 7b are shifted from the rotation centers of the mounting shafts 1, 2 in this way, the blades 7a, 7 mesh with each other.
The engagement depth of b changes with rotation, making it difficult to cut the metal plate smoothly.

In order to solve this problem, a shearing tool blade mounting shaft is proposed in Japanese Patent Application Laid-Open No. 57-114315, etc., in which a small diameter part located in the middle is sandwiched between large diameter parts located at both ends of this small diameter part. a mounting shaft body; a holding cylinder that is cylindrical and has an outer diameter slightly smaller than the inner diameter of the cutter and is fitted onto the large diameter portion of the mounting shaft body; an inner circumferential surface of the holding cylinder and the mounting shaft body; It consists of an oil passage that communicates the inside of a sealed gap formed between the outer peripheral surface of the small diameter part and the pressure oil supply means, and the outer diameter of the holding cylinder is adjusted based on the supply and discharge of pressure oil into the gap. A blade attachment shaft for a shearing machine is disclosed in which a ring-shaped blade can be attached to and removed from the outer peripheral surface of the holding cylinder by expanding and contracting the blade.

(Problems to be Solved by the Invention) However, in the case of the above-mentioned conventional hydraulic expandable shearing tool blade mounting shaft, the following disadvantages still occur.

That is, it is generally known that the rigidity of a columnar article along its length is inversely proportional to the cube of its length when the cross-sectional area is the same. When making a blade mounting shaft with a large overall length in order to cut a wide band-shaped metal plate using a shearing machine, it is necessary to increase the cross-sectional area to give the mounting shaft sufficient rigidity.

However, simply increasing the cross-sectional area of the mounting shaft body and the retaining tube that make up the mounting shaft would not meet the need for improved rigidity due to the increased weight that accompanies the increased cross-sectional area. In other words, the weight increases unnecessarily, and the rigidity cannot necessarily be improved sufficiently.

Without increasing the weight of the entire mounting shaft,
In order to improve the rigidity over the length direction, the mounting shaft body and the holding cylinder, which are assembled concentrically with each other, cooperate with each other, and both members work together to ensure rigidity over the length direction of the mounting shaft. However, in the case of conventional knife mounting shafts, such as the one described in the above-mentioned Japanese Patent Application Laid-Open No. 114315/1983,
Due to the gap that exists between the inner circumferential surface of the holding cylinder and the inner circumferential surface of the mounting shaft body, the above two members are not integrated, and the rigidity of each member must be improved independently of each other. Ta.

The inventor has researched this problem, and found that
The width of the gap formed between the inner circumferential surface of the holding cylinder and the outer circumferential surface of the mounting shaft body should be kept extremely narrow (for example, 20 to 40 μm).
If the pressure oil is sent into this gap, it will be possible to obtain the rigidity as if the mounting shaft body and holding cylinder were integrated, and the cross-sectional area of the mounting shaft body and holding cylinder could be particularly large. It was found that greater rigidity can be obtained even if the width of the gap is not large compared to when the width of the gap is large, but if the width of the gap is simply narrowed, there is The work of supplying and discharging relatively high viscosity pressure oil ends up taking a long time.

The invention of the present application solves this inconvenience, and even when the width of the gap is made extremely small and the rigidity in the length direction of the blade mounting shaft is improved without increasing the weight, this gap The work of supplying and discharging pressure oil inside the blade can be carried out in a short time, and the time required to attach and detach the blade to the outer peripheral surface of the blade mounting shaft is prevented from becoming unnecessarily long.

b. Structure of the invention (Means for solving the problem) The blade mounting shaft for a shearing machine of the invention has a small diameter part located in the middle and having a spiral groove formed on the outer circumferential surface over almost its entire length, and a large diameter part at both ends. On the mounting shaft body sandwiched between
A cylindrical holding cylinder is fitted onto the outside to maintain oil tightness between the inner circumferential surface of both ends of the holding cylinder and the outer circumferential surface of the large diameter part of the mounting shaft body.

Provided inside the mounting shaft body, and formed between the inner circumferential surface of the holding cylinder and the outer circumferential surface of the small diameter part of the mounting shaft body.
The other end of the oil passage, which has one end open inside the spiral groove facing the sealed gap, is communicated with a pressure oil supply means so that pressure oil can be supplied to and discharged from the gap through the spiral groove. ing.

(Function) When a ring-shaped cutter is attached to the shearing machine mounting shaft of the present invention constructed as described above, pressure oil is applied to the gap between the outer circumferential surface of the small diameter part of the mounting shaft and the inner circumferential surface of the holding cylinder. Before sending in the oil, cutters having an inner diameter slightly larger than the outside diameter of the holding cylinder are fitted onto the holding cylinder, and after each blade is moved to a predetermined position, the oil is passed through the oil passage and the spiral groove. to send pressure oil into the gap.

This pressurized oil supply causes the cylindrical retaining cylinder to expand, causing the outer circumferential surface of the retaining cylinder to come into firm contact with the inner circumferential edges of the blades, thereby firmly fixing each blade to the retaining cylinder.

In the case of the blade mounting shaft for a shearing machine of the present invention, pressure oil is supplied and discharged into the gap through the spiral groove formed almost all around the small diameter part, so the width of the gap is extremely small. Even in narrow spaces, pressure oil can be supplied and discharged in a short time.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

FIG. 2 shows the overall structure of the blade mounting shaft for a shearing machine according to the present invention. The cylindrical mounting shaft main body 9 is not provided with a flange 3 or a male screw 4 like the conventional mounting shaft shown in FIG. Large diameter portions 11, 11 are provided at positions sandwiching the small diameter portion 10. A spiral groove 12 having a rectangular or trapezoidal cross section is cut into the outer peripheral surface of the small diameter portion 10, and the small diameter portion 10 is formed into a male screw shape.

A holding cylinder 13 formed in a cylindrical shape made of steel or the like is tightly fitted onto the outer peripheral surfaces of the large diameter parts 11, 11 that sandwich the small diameter part 10 therebetween. This holding cylinder 13
As shown in detail in FIG. 3, both ends of the countersunk screw 14
The large diameter parts 11, 11 are fixed to the large diameter parts 11, 11 by fitting an O-ring 16 into a groove 15' formed on the outer peripheral surface of the large diameter parts 11, 11.
11 and the inner circumferential surfaces of both ends of the holding cylinder 13 are kept oil-tight.

On the bottom surface of the spiral groove 12, one end of the oil passages 17, 17 is opened at the portions located at both ends of the small diameter portion 10, respectively. The oil passages 17, 17 supply pressurized oil to a cylindrical gap 18 formed between the outer circumferential surface of the small diameter portion 10 of the mounting shaft body 9 and the inner circumferential surface of the holding cylinder 13. It inflates the cylinder 13,
The other end of each oil passage 17, 17 communicates with a pressure oil supply means 19 as shown in FIG. However, depending on conditions such as the length of the mounting shaft, it may be sufficient to provide only one set of the oil passage 17 and the pressure oil supply means.

The pressure oil supply means 19 shown in FIG. 4 is provided with a piston 20 and a screw rod 22 that pushes the piston 20 through a steel ball 21 on the end face of the mounting shaft body 9. That is, on the end surface of the attachment main body 9, a cylinder part 23 is provided in the deep part, and a female screw part 2 is provided near the opening.
A circular hole 25 is provided in which the piston 20 is loosely fitted into the cylinder portion 23 of the circular hole 25, and the male screw portion 22a at the tip of the screw rod is inserted into the female screw portion 24.
are screwed together. The end of the oil passage 17 opens at the inner surface of the cylinder portion 23 of the circular hole 25, and when the piston 20 moves to the right in FIG. It is designed to allow pressure oil to be sent. A circular hole 25 is formed at the end of the threaded rod 22 with the male threaded part 22a screwed into the female threaded part 24.
A prismatic portion is formed on the protruding portion, and the screw rod 22 can be powerfully rotated with a tool such as a spanner.

Because of this structure, when the screw rod 22 is rotated with a spanner or the like and moved to the right in FIG. It enters the gap 18 inside the holding cylinder 13 via the oil passage 17 and the spiral groove 12,
This holding cylinder 13 is pressed from inside to outside. At this time, the hydraulic pressure reaches a maximum of several hundred kg/ ^cm2 , so
The outer diameter of the metal holding cylinder 13 is slightly expanded.

At this time, the small diameter portion 1 located inside the holding cylinder 13
Since the spiral groove 12 is provided on the outer peripheral surface of 0,
The pressure of the pressure oil fed into the gap 18 by the pressure oil supply means 19 is applied evenly over the entire inner circumferential surface of the holding cylinder 13, thereby expanding the diameter of the holding cylinder 13 uniformly over its entire length in a short time.

Next, a procedure for attaching and detaching a ring-shaped cutter to and from the shear cutter attachment shaft of the present invention constructed in this manner will be explained.

First, when attaching a ring-shaped cutter to the mounting shaft, the screw rod 22 is warmed, the piston 20 is moved to the left, and no pressure oil is fed into the inside of the holding cylinder 13. In this state, the outer diameter of the holding tube 13 is slightly smaller than the inner diameter of the ring-shaped cutter (see symbols 7a and 7b in FIG. 1), so this cutter can be easily fitted to any position on the holding tube 13. I can do it.

Once the position of each blade has been determined, the screw rod 22 is rotated using a tool such as a spanner, and the piston 20 is moved to the right in FIG. 4 to generate hydraulic pressure within the cylinder section 23. , into the gap 18 inside the holding cylinder through the oil passage 17.

As a result, the retaining tube 13 expands, and
The outer peripheral surface of the retaining cylinder 13 and the inner peripheral edge of each blade are firmly abutted against each other, and each blade is firmly fixed to the outer peripheral surface of the retaining cylinder 13.

When removing the knife from the holding cylinder 13, it is easy to remove the knife after warming the screw rod 22 and releasing the hydraulic pressure in the gap 18 to reduce the diameter of the holding cylinder 13, contrary to the above-mentioned installation work. It can be removed.

As mentioned above, when supplying and discharging pressure oil into the gap 18 in order to attach and detach a cutter to and from the outer circumferential surface of the holding cylinder 13, this supply and discharge is carried out through the spiral groove formed over almost the entire circumference of the small diameter portion 10. 12, so the above gap 1
Even if the width of 8 is extremely narrow, pressure oil can be supplied and discharged in a short time.

Therefore, even if the width of the gap 18 is narrowed to improve the rigidity over the length of the mounting shaft,
The time required to attach and detach the blade does not become unnecessarily long.

Next, the experiments conducted by the present inventor will be explained. In this experiment, a steel holding cylinder 13 with an inner diameter of 150 mm and a wall thickness of 12.5 mm was used, and the length of the small diameter part 10 on the outer periphery of the mounting shaft body was 1360 mm, as shown in Fig. 4. A hydraulic pressure of 250 kg/cm ² was applied to the gap 18 inside the holding cylinder 13 by the pressure oil supply means. The inner diameter of the cutter 7 fixed to the outer peripheral surface of the holding cylinder 13 was set to be 0.02 to 0.03 mm larger than the outer diameter of the holding cylinder 13 when the diameter was reduced. Under these conditions, when the four blades 7, 7 are attached to the outer circumferential surface of the holding cylinder 13 according to the procedure described above, after applying hydraulic pressure to the gap 18, all the blades 7, 7 are attached to the outer circumference of the holding cylinder 13. It was firmly fixed to the surface without wobbling.

Furthermore, as shown in FIG. 6, the blade mounting shaft of the present invention in which such blades 7, 7 are fixed, and the conventional blade mounting shaft in which the blades are fixed via a spacer as shown in FIG. When cutting a combination of 0.4 mm thick stainless steel plate, 0.5 mm thick silicon steel plate, and 0.6 mm thick cold rolled steel plate, the blades did not slip against each other in all cases. I was able to perform a good cutting job.

c. Effects of the invention Since the blade mounting shaft for a shearing machine of the present invention is constructed and operates as described above, there is no need for a spacer etc. to fix the blade in a predetermined place, and dimensional errors of each member are taken into consideration. The blade can be easily installed in any position without any trouble, and since the center of the blade mounting shaft and the center of the blade match, the blades always mesh at a constant depth, allowing for good cutting work. In addition to the effects of the conventional blade mounting shaft for a hydraulic expandable shearing machine, the following excellent effects can be obtained.

In other words, by making the width of the gap formed between the inner circumferential surface of the holding cylinder and the outer circumferential surface of the mounting shaft body extremely narrow, the cross-sectional area of the mounting shaft body and the holding cylinder can be easily It is possible to obtain greater rigidity than when the width of the gap is large, and even in this case, the work of supplying and discharging pressure oil into this gap can be done in a short time, and the blade can be attached to the outer peripheral surface of the blade mounting shaft. The time required for attaching and detaching the metal plate does not become unnecessarily long, and the band-shaped metal plate can be cut efficiently.

[Brief explanation of drawings]

Figure 1 is a front view of a conventional shearing machine blade mounting shaft.
Fig. 2 is a partial longitudinal sectional front view of a blade mounting shaft showing an embodiment of the present invention, Fig. 3 is an enlarged view of the central part of Fig. 2,
FIG. 4 is an enlarged view of the left side of FIG. 2, FIG. 5 is a partially vertical front view showing the state in which the cutter is attached, and FIG. 6 is a front view showing the state in use. 1: Mounting shaft, 2: Mounting shaft, 3: Flange, 4:
Male screw, 5: first spacer, 6: second spacer,
7, 7a, 7b: cutter, 8: nut, 9: mounting shaft body, 10: small diameter part, 11: large diameter part, 12: spiral groove, 13: holding cylinder, 14: countersunk screw, 15: concave groove,
16: O-ring, 17: Oil passage, 18: Gap, 1
9: Pressure oil supply means, 20: Piston, 21: Steel ball, 22: Threaded rod, 22a: Male threaded portion, 23: Cylinder portion, 24: Female threaded portion, 25: Circular hole.

Claims (1)

[Scope of utility model registration request] A shearing machine that cuts a plate material inserted between two mounting shafts that rotate in opposite directions by meshing the outer periphery of a ring-shaped blade attached to the outer peripheral surface of two mounting shafts that are arranged parallel to each other. The blade mounting shaft has a small diameter part located in the middle with a spiral groove formed on the outer circumferential surface over almost its entire length, and a mounting shaft body sandwiched between large diameter parts located at both ends of this small diameter part, and a circular tubular shape. a holding cylinder which has an outer diameter slightly smaller than the inner diameter of the cutter and is fitted onto the large diameter portion of the mounting shaft body; and between the inner circumferential surface of the holding cylinder and the outer circumferential surface of the small diameter portion of the mounting shaft body. A blade mounting shaft for a shearing machine comprising an oil passage that communicates the inside of the spiral groove facing a sealed gap formed in the spiral groove with a pressure oil supply means.