JPS6117778Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a cutter shaft used in a slitting device that cuts a steel plate into a predetermined number of strips, and in particular relates to an improvement of a cutter shaft that uses hydraulic pressure to fix a disc-type cutter. It is something.

In a slitting device that slits a material into a predetermined number of threads by placing cutter shafts having disc-type cutters above and below and applying a shearing action to the material passing between them, the material to be cut is a thin steel plate, for example, 0.3 mm. mm to around 1.0mm, the allowable error of the clearance value and wrap value to be given to the upper and lower two cutters is effectively 1/100mm.
It is necessary to keep it within this range.

For this purpose, as shown in FIG. 1, a sleeve 2 is fitted around the outer periphery of the arbor 1, an annular pressure receiving chamber 3 is formed between the fitting surfaces of the sleeve 2 and the arbor 1, and the sleeve 2 is fixed on the sleeve 2. A cutter shaft has been proposed in which the outer diameter of the sleeve 2 is expanded by the pressure of liquid supplied from a passage 5 provided in the arbor 1 to the pressure receiving chamber 3 to fix the cutter 4 to be fixed.

Pressure receiving chamber 3 in the above conventional cutter shaft
is formed in a continuous state over the entire length in the axial direction, leaving a fitting part 8 on both ends of which the sleeve 2 and the arbor 1 are fitted externally on the same circumference, and is formed in a continuous state over the entire length of the pressure receiving chamber 3, and the hydraulic pressure is applied over the entire length of the pressure receiving chamber 3. The cutter 4 is fixed in place. However, the width of the material to be cut is, for example, within the range of 600 to 1600 mm and is not constant.
Therefore, even when the cutter is fixed near the center to slit a narrow material, the hydraulic pressure is applied to the entire length of the pressure receiving chamber 3, so the long sleeve section between the cutter and the fitting part is larger than the other sleeve sections. This causes the fitting portion to bulge out, resulting in insufficient gripping force of the fitting portion, and slipping occurs at the fitting portion 6 between the sleeve 2 and the arbor 1.

Therefore, in order to prevent both ends of the sleeve from slipping against the arbor, it is necessary to increase the surface pressure of the fitting part 6, but if the fitting part 6 is configured to be a strong fit, the stress on the sleeve will increase and the fatigue of the arbor will increase. There are disadvantages such as a decrease in strength, and if the fitting portion 6 is formed to be long, it is difficult to apply it to the current cutter shaft without modification.

This idea was proposed to solve the above-mentioned problems, and the axis of the fitting part on both sides narrows the pressure receiving chamber formed between the arbor and the sleeve. It is an object of the present invention to provide a cutter shaft that can prevent slippage between the sleeve and the arbor as much as possible by eccentrically eccentrically moving the sleeve and the arbor in opposite directions.

Embodiments of this invention will be described below with reference to FIGS. 2 to 4.

The cutter shaft 11 according to this invention has an annular pressure receiving chamber 14 formed between an arbor 12 and a sleeve 13 fitted onto the arbor, and a hydraulic pressure supply passage 15 communicating with the pressure receiving chamber 14 in the arbor 12. Conductive from one end, and the pressure receiving chamber 14
Both end fitting portions 1 of the arbor 12 and sleeve 13 that narrow the
Arbor 12 outer periphery and sleeve 13 at 6, 17
The axis B of the inner circumference is slightly eccentric from the axis A of the cutter shaft 11 in different directions.

Note that 18 is a disc type cutter attached to the outer periphery of the sleeve 13 at an appropriate interval. Furthermore, in this embodiment, an example is shown in which the fitting parts 16 and 17 are eccentric to the opposite side by 180 degrees by narrowing the axis A of the cutter shaft 11, but the fitting parts 16 and 17 are not limited to this in any way. Alternatively, it may be eccentrically positioned at a different angle as appropriate, such as 45 degrees.

By the way, in the case of this embodiment, the sleeve 13 is attached to the arbor 12 by aligning the eccentric shaft from one end of the arbor 12, inserting the sleeve 13 through the arbor 12, rotating it 180 degrees, and then attaching the fitting portions 16 and 17 at both ends.
This can be easily done by adjusting the eccentricity of.

As shown in FIGS. 2 and 3, the portion of the sleeve 13 forming the pressure receiving chamber 14 is coaxial with the axis A of the cutter shaft 11, and the wall thickness of the sleeve 13 is equal throughout the circumference. , the amount of expansion due to hydraulic pressure is constant over the entire circumference.

Further, although not shown in the drawings, a valve mechanism capable of supplying liquid and sealing is connected to the end opening of the hydraulic pressure supply passage 15.

The cutter shaft of this invention has the above-described configuration, and when hydraulic pressure is supplied from the hydraulic pressure supply passage 15 into the pressure receiving chamber 14, the portion of the sleeve 13 facing the pressure receiving chamber 14 expands, and the cutter 18 is fixed on the sleeve 13. The cutting operation is performed using the following methods.

Even when performing the cutting work as described above, the cutter shaft 11 of the present invention has two fitting parts 1 on both sides.
Since the shafts 6 and 17 are eccentric in opposite directions with respect to the axis of the cutter shaft 11, there is no slippage between the arbor 12 and the sleeve 13 during slitting, and the surface pressure is reliably maintained.

As described above, according to this invention, the fitting parts at both ends sandwiching the pressure receiving chamber formed between the arbor and the sleeve are formed eccentrically with respect to the axis of the cutter shaft, so that slipping of the sleeve with respect to the arbor occurs. This makes it possible to prevent as much as possible the fitting part of the arbor and the sleeve at both ends of the pressure-receiving chamber, thereby increasing the gripping force of the arbor on the sleeve and preventing the sleeve from slipping. Things will disappear.

Further, since close fitting portions can be maintained at both ends of the pressure receiving chamber, there is no need to increase the surface pressure, which has the effect of making it possible to downsize the cutter shaft.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a conventional cutter shaft, Fig. 2 is a partially cutaway front view of the cutter shaft according to this invention, Fig. 3 is a longitudinal sectional side view taken along the arrow - in Fig. 2, and Fig. 4. 2 is a vertical sectional side view taken along the arrow - in FIG. 2. FIG. 11 is a cutter shaft, 12 is an arbor, 13 is a sleeve, 14 is a pressure receiving chamber, 15 is a hydraulic pressure supply passage,
16 and 17 are fitting parts, and 18 is a cutter.

Claims (1)

[Scope of utility model registration request] A cutter shaft in which an annular pressure-receiving chamber is formed between an arbor and a sleeve externally fitted on the arbor, and the sleeve is expanded by supplying liquid pressure into the pressure-receiving chamber, thereby fixing the sleeve and the cutter attached to the sleeve. In this case, the shaft center of the relative fitting portions located at both ends of the arbor having an annular recess formed in the center of the shaft and the sleeve externally fitted onto the arbor to seal the annular recess of the arbor is aligned with the shaft of the cutter shaft. A cutter shaft of a slitting device characterized by being eccentric in directions opposite to each other with respect to the center.