JPH0115516Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotary processing tool called a slitter knife or side trimmer cutter for shearing steel plates, paper, etc.

[Prior Art] For example, when slitting a sheet-like steel plate or paper into a narrow tape-like shape, a rotary processing tool as shown in FIG. 8 has been used. This is drive shaft 2
A suitable number of disc-shaped slitting knives 23 are attached to the sliver knife 1 through spacers 22 of a predetermined width.
A pair of slitting knives 23 are provided facing each other.
The edges of the sheet are set to overlap, and the sheet is run between the slitter knives 23 to shear it.

However, in such a rotary machining tool, there are a large number of types and quantities of spacers 22, and manufacturing and management thereof requires time and cost. In addition, in order to shear the product without "burrs" or "burrs" on the sheared surface of the product, it is necessary to accurately position the slitter knife 23 in the drive shaft direction. It is necessary to strictly maintain the accuracy of the width dimension within a predetermined range, but this is not only costly but also difficult in practice. Especially in the direction of the drive shaft, there are many slits and
When attaching the knife 23 and spacer 22, the above-mentioned problem was even more pronounced because errors were accumulated.

As a result of research, the inventors of this invention found that
165914, JP-A-59-129612, and JP-A-59-129614, which provided a solution to the above problem. This is done by fitting a contraction ring into the shaft hole of a base metal with a cutting edge on its outer periphery, forming an oil chamber between this contraction ring and the base metal, and applying hydraulic pressure to the oil chamber in the base metal. A device is provided in which the contraction ring is fitted onto the drive shaft, and hydraulic pressure is applied to the oil chamber to compress the contraction ring and fix it to the drive shaft.

[Problems to be solved by the invention] The conventional technology described above has many advantages, such as eliminating the need for spacers, reducing manufacturing and management costs, and facilitating positioning in the direction of the drive shaft. However, the fitting clearance between the contraction ring and the drive shaft is set small in order to prevent side wobbling of the cutting edge, so the fitting tolerance is also small, increasing manufacturing costs and making installation and positioning difficult. However, there was a problem in that it required skill.

[Means for solving the problems] In order to solve the above problems, the present invention has the following features:
A contraction ring is fitted into the shaft hole of a base metal having a cutting edge on its outer periphery, an oil chamber is formed between the contraction ring and the base metal, and a hydraulic device is provided in the base metal to apply hydraulic pressure to the oil chamber. In the rotary processing tool, the contraction ring is fitted onto the drive shaft, and hydraulic pressure is applied to the oil chamber to compress the contraction ring and fix it to the drive shaft. A place has been set up.

[Function] According to the rotary processing tool of the present invention, since the annular recess is formed in the center of the inner surface of the shrink ring, the inner surface of the shrink ring expands uniformly when hydraulic pressure is applied, and the shrink ring and The contact area with the drive shaft is increased, and the shaft is firmly fixed, and the run-out in the axial and circumferential directions during shearing is reduced, allowing high-quality machining to be performed without "burrs" or "burrs" on the sheared surface.
As a result, the fitting clearance between the contraction ring and the drive shaft can be increased, so that the contraction ring can be easily attached to and removed from the drive shaft or positioned, and no skill is required.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 show a first embodiment of the present invention, and in these figures, reference numeral 1 indicates a base metal in which a shaft hole 2 is formed, and reference numeral 3 indicates a base metal fitted into this shaft hole 2. A contraction ring, numeral 4 is a cutting edge provided on the outer periphery of the base metal 1, numeral 5 is an oil chamber formed between the contraction ring 3 and the base metal 1, and numeral 6 is an oil chamber for applying hydraulic pressure to the oil chamber 5. Reference numeral 7 is an annular recess formed in the center of the inner surface of the contraction ring 3, and reference numeral 8 is a drive shaft.

The base metal 1 has a thick wall portion 1 on which the cutting edge 4 is formed.
a and the thin wall portion 1b where the hydraulic device 6 is provided.
The oil chamber 5 is formed in an annular shape on its inner surface, and the shrink ring 3 is shrink-fitted inside the oil chamber 5.

In this example, the cutting edge 4 is integrally formed of the same material as the base metal 1, but it may be made of a different material. The cutting edge 4 is made of a highly wear-resistant material such as high-speed steel, cemented carbide, or ceramics.

The hydraulic device 6 includes an oil chamber 5 and a thin wall portion 1 of the base metal 1.
(b) A cylinder part 10 that communicates with the outer surface and has a female thread 9 formed at its outer end, a piston 11 housed in the cylinder part 10, and a male thread 12 that is screwed into the female thread 9 and operates the piston 11. The oil pressure in the oil chamber 5 can be adjusted from the outside of the base metal 1. An O-ring 13 is attached to the tip of the piston 11, and the cylinder part 10
And the hydraulic oil in the oil chamber 5 is sealed.

The recess 7 is annularly provided on the inner surface of the contraction ring 3, and its axial position and length are set to approximately correspond to the oil chamber 5. In addition, the depth and cross-sectional shape of the recess 7 are such that when oil pressure is applied to the oil chamber 5, the inner surface of the contraction ring 3 protrudes in an arc shape in a cross section that includes the shaft, and as a result, the cross section of the recess 7 is closer to the drive shaft 8. Various values or shapes can be set to form a widening trapezoidal shape, but in the inventors' experience, the depth of the recess 7 is set to approximately half the fitting clearance between the contraction ring 3 and the drive shaft 8. is appropriate.

Next, the operation of the rotary processing tool configured as described above will be explained. After fitting the contraction ring 3 onto the drive shaft 8 and positioning it, when the male screw 12 of the hydraulic device 6 is rotated appropriately, the piston 11 descends and hydraulic pressure is applied to the oil chamber 5, which causes the contraction ring 3 to come out. It is compressed from both sides. At this time, since an annular recess 7 is formed at the center of the inner surface of the shrink ring 3 at a position that corresponds to the oil pressure 6, the inner surface of the shrink ring 3 protrudes in an arc shape in a cross section including its axis, resulting in a recess. The cross section of point 7 becomes trapezoidal, with the side closer to drive shaft 8 widening. Therefore, the axially opposite edges of the recess 7 are brought into close contact with the drive shaft 8 to prevent the contraction ring 3 from moving in the axial direction.

Figure 7 shows the results of measuring the side runout of the edge portion of base metals of the same shape, one with a recess formed according to the present invention and a conventional example, during no-load rotation. There is less lateral wobbling. This is thought to be because when a recess is formed, the shape of the inner expanded portion of the contraction ring becomes flatter, and the contact area between the contraction ring and the drive shaft becomes larger.

According to this result, for example, in order to suppress side runout to 10 μm or less, in the conventional example, the fitting clearance between the contraction ring and the drive shaft must be 5 μm or less, whereas in the embodiment of the present invention, Therefore, it is sufficient to have a thickness of 20 μm or less, which means that attachment/detachment and positioning operations are easy and do not require skill.

In addition, for the above reasons, positioning is performed accurately,
In addition, since there is little lateral wobbling, it is possible to perform processing with a good finish without "burrs" or "burrs" on the sheared part.

3 to 6 show other embodiments of the present invention, and the example shown in FIG. 3 is the example shown in FIG. 1, in which a rib 14 is provided on the outer periphery of the shrink ring 3 to reinforce it. In the example shown in FIG. 4, a flange 15 is formed at one end of the shrink ring 3, and the flange 15 and the base metal 1 are connected to each other by an appropriate number of bolts 16 in the circumferential direction. In the example shown in FIG. 5, the shrink ring 3 is fixed to the base metal 1 by welding. Also, the 6th
In the example shown in the figure, the outer opening end of the cylinder part 10 is provided on the side surface of the base metal 1, which makes it easy to adjust the oil pressure and allows the cutting edge 4 to be set at any position in the width direction of the base metal 1. It's summery.

In the above four examples, the method of attachment to the drive shaft 8 and its operation are the same as in the first embodiment.

[Effects of the invention] In the present invention, a contraction ring is fitted into the shaft hole of a base metal with a cutting edge on the outer periphery, an oil chamber is formed between the contraction ring and the base metal, and this oil is inserted into the base metal. The rotary processing tool is provided with a hydraulic device that applies hydraulic pressure to a chamber, the contraction ring is fitted onto the drive shaft, and the contraction ring is compressed and fixed to the drive shaft by applying hydraulic pressure to the oil chamber. Since an annular recess is provided in the center of the inner surface of the ring at a position that corresponds to the oil chamber, the center of the contraction ring is compressed when hydraulic pressure is applied to the oil chamber by the hydraulic device.
The recess deforms into a trapezoidal shape in a cross section that includes the shaft, and its edge comes into contact with the drive shaft. Therefore,
The shrink ring and base metal are firmly fixed to the drive shaft,
The axial and circumferential run-out during shearing is reduced,
It is possible to perform high-quality processing without "burrs" or "burrs" on the sheared surface. This makes it possible to increase the fitting clearance between the shrink ring and the drive shaft, which reduces manufacturing costs, and also makes it easier to attach and detach the shrink ring to the drive shaft and to position it, which requires skill. It has excellent effects such as:

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of the first embodiment of the present invention, and FIG. 2 is a schematic diagram showing the state in which it is used.
3 to 6 are cross-sectional views of main parts of other embodiments of the present invention, FIG. 7 is a graph showing side vibration during rotation of a conventional example of the same shape and an example of the present invention, and FIG.
The figure is a sectional view of a conventional example. 1...Base metal, 2...Shaft hole, 3...Shrink ring,
4...Blade tip, 5...Oil chamber, 6...Hydraulic system, 7...
...Recess, 8...Drive shaft.

Claims (1)

[Scope of utility model registration request] It comprises a base metal 1 in which a shaft hole 2 is formed, a shrink ring 3 fitted into the shaft hole 2, and a cutting edge 4 provided on the outer periphery of the base metal 1, and the shrink ring 3 and the base metal An oil chamber 5 is formed between the base metal 1 and the oil chamber 5, and a hydraulic device 6 for applying hydraulic pressure to the oil chamber 5 is provided on the base metal 1, and the contraction ring 3 is fitted around the drive shaft 8.
In a rotary processing tool in which oil pressure is applied to the oil chamber 5 to compress the contraction ring 3 and fix it to the drive shaft 8, the contraction ring 3 is located at a position approximately corresponding to the oil chamber 5 at the center of its inner surface. annular recess 7
A rotary processing tool characterized by being provided with.