JP2662584B2 - Grinder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinder, and more particularly to a grinder capable of changing at least one of its rigidity and damping property.

[Prior Art] Conventionally, this kind of grinder has not existed to the knowledge of the present applicant. Therefore, the grinding machine itself has inherent rigidity, that is, it is hard to generate distortion, and has a damping property, that is, it is easy to attenuate the generated vibration, and these cannot be changed. In general, it is considered that higher rigidity and higher damping property are preferable in terms of the processing accuracy of the work and the goodness of the finished surface.

[Problems to be Solved by the Invention] By the way, when a grinding burn occurs during grinding by such a grinding machine, the temperature of the grinding portion of the work rapidly rises, thereby causing thermal expansion of the same portion. A phenomenon of expanding on the grinding wheel side occurs. In this case, since the rigidity of the grinding machine is too high, even if the work expands, the grindstone cannot escape correspondingly, and this expansion directly leads to an increase in the grinding pressure, and as a result, the grinding burn is further worsened. There is a problem of repeating.

On the other hand, when performing heavy grinding that does not require accuracy,
In general, it is said that it is desirable to perform grinding in a state where vibration is generated in the grindstone, but in this case, the grinding machine is required to have low rigidity and a property that the vibration once generated is hardly attenuated. .

In other words, the higher the rigidity and the damping property of the grinding machine are not necessarily the better, but according to the grinding state as described above, or according to the material of the work or the type of the grindstone,
The rigidity and damping required for the grinding machine are different.

An object of the present invention is to provide a grinding machine capable of arbitrarily changing at least one of rigidity and damping property.

[Means for Solving the Problems] The grinding machine according to claim 1 is provided with a high rigidity fixed column, a low rigidity movable column for supporting a grindstone, and an elastic member capable of changing the elasticity of both columns. It is a concatenation.

And the elastic member includes a plurality of coil springs.

The grinding machine according to claim 3 is provided with a high-rigidity fixed column, a low-rigidity movable column that supports the grindstone, a sliding contact member provided on each of the columns, and the sliding contact members are pressed against each other, and A press-contact means for adjusting the press-contact force is provided.

As the movable column of the grinding machine of the first and third aspects,
The base is pivotally supported in the front-rear direction with respect to the base, and the base is attached to the base via an elastic member.

[Operation] The movable column is supported by the fixed column via an elastic member. When a force is applied to the grindstone and the movable column moves, the elastic force of the elastic member hinders the movement. When the elastic force of the elastic member is changed, the degree of movement of the movable column when the force is applied also changes.

When a part of the plurality of coil springs connecting the movable column and the fixed column is removed so as not to operate, the elastic force of the entire coil spring is changed accordingly.

When an external force is applied to the movable column and the movable column moves, the sliding member of the movable column and the sliding member of the fixed column slide against each other by pressing means, and at this time, a resistance force that hinders the movement of the movable column is generated. Occurs. When the pressing force of the pressing means is changed, the resistance changes accordingly.

Since the movable column is supported by the base, it freely rotates when an external force is applied.

Since the movable column is attached to the base via an elastic member, when the external force is applied, the movable member freely rotates by bending.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, a table unit 2 is provided at the front of the base 1 so as to be movable in the front-back and left-right directions.
A pair of support protrusions 3 are provided at the rear portion of the base 1 so as to protrude upward. Support holes 3a are provided in the both protrusions 3 and both sides of the both protrusions 3 are provided respectively. A mounting seat 4 is formed.

As shown in FIGS. 1 and 2, a lower portion of a block-shaped movable column 5 is fitted between the two support protrusions 3, and a tilting hole 5a penetrating the lower portion overlaps with the support hole 3a. , Both holes 3
The shaft 6 is fitted into a and 5a. A grindstone head 7 is provided on the front side of the movable column 5 so as to be vertically movable, and a grindstone 8 which is rotated by a motor (not shown) is attached to the tip of the head 7. On the rear surface of the movable column 5, a holding block 9 as a sliding contact member is provided with a support plate projecting rearward.
It is fixed via 9a. On both left and right sides of the movable column 5, mounting portions 10 each composed of four female screws are provided at two upper and lower locations, respectively. Similarly, three mounting portions 10 are also provided on the upper surface of the movable column 5.

As shown in FIGS. 1, 4, and 5, on the movable column 5,
A box-shaped fixed column 11 having an open lower surface and front and rear surfaces is disposed so as to cover, and both lower portions of the fixed column 11 are fixed to the mounting seats 4 of the base 1, respectively. Fixed column 11
Each of the movable columns 5 has a through hole 12 formed at a position corresponding to each mounting portion 10, and the mounting portion 10 is exposed to the outside of the fixed column 11 through the through hole 12. As shown in FIGS. 1 and 3, the upper portion of the rear surface of the fixed column 11 is closed by a mounting plate 13, and a through hole 14 is formed in a portion of the plate 13 corresponding to the holding block 9 of the movable column 5. . Nipping block 9
Protrudes to the rear of the fixed column 11 through the through hole 14.

As shown in FIGS. 1 and 3, a pair of flange members are provided on the mounting plate 13 so as to be located on both left and right sides of the holding block 9.
15 and 16 are fixed, and a protrusion 15 a as a sliding contact portion protruding from one of the flange members 15 is in contact with the right side surface of the holding block 9. Further, a fitting hole 17 is formed in the other flange member 16 from the right side, and a female screw 18 is formed from the left side. An adjusting screw 19 is screwed into the female screw 18 from the left, a coil spring 20 as a pressure contact means is inserted into the fitting hole 17 from the right, and a pressing member 21 as a sliding contact portion.
Are fitted so as to be able to move left and right.

Then, the pressing member 21 is pressed against the side surface of the holding block 9 by the coil spring 20, whereby the support plate 9a of the holding block 9 bends rightward to press the projection 15a of the other flange member 15 against the other. Therefore, both sides of the holding block 9 are held by the pressing member 21 and the projection 15a of the flange member 15.

As shown in FIGS. 1 and 4, each mounting portion 1 of the movable column 5
A movable block 24 having four mounting holes 25 corresponding to the female screws is attached to the movable block 24 by bolts 26 through the mounting holes 25, respectively. The diameter of each mounting hole 25 is formed slightly larger than the diameter of the bolt 26, and a gap is provided between each movable block 24 and the through hole 12 of the fixed column 11. Fixed blocks 23 are fixedly attached to the front and rear sides of each movable block 24 in the fixed and fixed column 11, respectively.
The coil springs 22 are fixed between them. In this state, each of the springs 22 is neither compressed nor tensioned.

Next, the operation when grinding is performed by the grinding machine configured as described above will be described.

The reaction force generated by the cutting of the grindstone 8 into the work acts to tilt the movable column 5 rearward about the shaft 6 as shown by the arrow in FIG. As shown in FIG. 4, the movable block 24 of each coil spring 22 is attached to the movable column 5, while the fixed block 23 is attached to the fixed column 11. It acts to compress the rear spring 22 so as to pull it. In other words, the coil spring 22 acts to prevent the movable column 5 from tilting. Therefore, how much the movable column 5 tilts due to the reaction force depends on the elastic force of the coil spring 22.

Then, as shown in FIG.
When the bolt 26 fixing the movable column 5 is loosened, only the bolt 26 moves together with the movable column 5, and the movable block 24 does not move. Therefore, the spring 22 at that location does not bend even when the movable column 5 tilts, and the total elastic force of the coil springs 22 provided at seven locations decreases. As a result, the degree of tilt of the movable column 5 increases. As described above, since the springs 22 are provided at seven places in total, the degree of flexure of the movable column 5, that is, the rigidity of the grinding machine is arbitrarily adjusted depending on how many of the coil springs 22 are operated. be able to.

On the other hand, when the movable column 5 is tilted by the reaction force of the cut as described above, the holding block 9 of the column 5 is moved with respect to the two flange members 15 and 16 of the fixed column 11 as shown by phantom lines in FIG. Move backward. Accordingly, both sides of the holding block 9 slide between the protrusions 15a of the flanges 15 and 16 and the pressing member 21, respectively, and a resistance force against the movement of the holding block 9 is generated. That is, the movable column 5
Generates vibrations in response to tilting caused by external force, and how fast the vibrations attenuate depends on how much resistance force is applied to the holding block 9.

When the adjusting screw 19 is tightened, the elastic force of the coil spring 20 is increased, so that the resistance to the movement of the movable column 5 can be increased.
When the screw 19 is loosened, the elastic force of the coil spring 20 becomes weak, so that the resistance becomes small. As described above, the resistance force for attenuating the vibration of the movable column 5, that is, the damping property can be arbitrarily adjusted only by turning the adjusting screw 19.

As described above, the rigidity and the damping property of the grinding machine of the present embodiment can be arbitrarily set.

Therefore, under grinding conditions in which grinding burn is expected to occur, it is possible to make the grindstone easily escape upward by lowering the rigidity, thereby preventing grinding burn.

When performing heavy grinding that does not require precision,
By reducing the rigidity and the damping property, it is possible to create a state in which the grinding wheel 8 constantly vibrates during the grinding without easily damping the vibration caused by the grinding. In addition, in addition to utilizing the vibration caused by the grinding work,
A balance piece (not shown) for correcting the balance provided on the side surface of the grindstone 8 may be intentionally brought into an unbalanced state, thereby vibrating positively.

On the other hand, the rigidity of the grinding machine according to the present embodiment can be set arbitrarily. Therefore, by changing the rigidity, the natural frequency of the grinding machine itself can be changed.

For example, in order to correct the balance of the grindstone 8, the balance state may be detected by a vibration detection sensor attached to the grinder. At this time, the natural frequency of the grinder is matched with the rotation speed of the grindstone 8. If the setting is made such that the grinding wheel 8 is unbalanced, a large vibration is generated in the grinding machine, so that it is easy to detect by the sensor.

The method of setting the rigidity and the damping property of the grinding machine of the present embodiment is not limited to the case described above, and may be changed according to the material of the work, or may be changed according to the type of the grindstone 8 to be used. May be.

Further, the grinding machine of the present embodiment is configured so that both the rigidity and the damping property can be changed, but may be configured so that only one of them can be changed.

Further, the movable column 5 of the grinding machine according to the present embodiment has its lower portion pivotally supported by the base 1 by the shaft 6 so as to be tilted in the front-rear direction. The movable column 5 may be attached to the base 1 via rubber, and the movable column 5 may be tilted by bending the rubber. The movable column 5 may be supported only by a spring as an elastic member, without providing a member for supporting the movable column 5 such as the shaft 6 described above.

On the other hand, in the grinding machine of the present embodiment, the movable column 5 and the fixed column 11 are connected by a plurality of coil springs 22 as elastic members. For example, both the columns 5, 11 are connected by one spring, A means for compressing and retracting the spring may be provided to change the elastic force,
Rubber may be used instead of the spring.

[Effects of the Invention] As described in detail above, according to the grinding machine of the present invention, there is an excellent effect that at least one of the rigidity and the damping property can be arbitrarily changed.

[Brief description of the drawings]

1 is an exploded perspective view of the grinding machine of the present embodiment, FIG. 2 is a side view of the same, FIG. 3 is a partial plan sectional view showing the relationship between the holding block and both flange members, and FIG. FIG. 5 is a partial plan view showing the relationship between the movable column, the fixed column, and the coil spring when the bolt is loosened. FIG. 5 is a partial plan view showing the relationship between the movable column, the fixed column, and the coil spring when the bolt is loosened. Base 1, movable column 5, whetstone 8, fixed column 11, projection 15
a (sliding portion), coil spring 20 (pressing means), pressing member 21 (sliding portion), coil spring 22 (elastic member).

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho-63-35572 (JP, U) Japanese Utility Model Sho-59-112553 (JP, U)

Claims (5)

(57) [Claims] A fixed column (11) having a high rigidity is provided, and a movable column (5) having a low rigidity for supporting a grindstone (8) is provided, and both columns (5, 11) are capable of changing elastic force. Grinding machine connected by member (22). 2. An elastic member comprising a plurality of coil springs (22).
The grinding machine according to claim 1, wherein 3. A fixed column (11) having a high rigidity is provided, and a movable column (5) having a low rigidity for supporting a grindstone (8) is provided, and sliding contact members (15a, 15a, twenty one)
And a pressing means (20) for pressing the sliding members (15a, 21) against each other and adjusting the pressing force.
Grinding machine provided. 4. A grinding machine according to claim 1, wherein the movable column (5) has its base pivotally supported in the front-rear direction with respect to the base (1). . 5. The grinding machine according to claim 1, wherein the movable column (5) is attached to the base (1) via an elastic member.