JPH02262951A - Polishing device - Google Patents

Abstract

PURPOSE:To bring a grindstone into contact with the face to be processed always at proper force regardless of ups and downs of the face to be processed of a work by providing the fluctuation relaxing mechanism for relaxing the fluctuation of the contacting force of a grindstone, caused by the operating resistance of a cylinder, between a cylinder and the grindstone. CONSTITUTION:The shifting of a grindstone 21 is absorbed within the range of the stroke of a cylinder 18, and the face to be processed is polished, with the grindstone 21 contacted by pressure with the face to be processed. The contacting force of the grindstone 21 at the time of polishing the flat position of this face to be processed becomes the same as the energizing force of the cylinder 18. When the grindstone 21 shifts up or down by the ups and downs formed at this face to be processed, the contacting force of the grindstone 21 fluctuates suffering the effect of the operating resistance of the cylinder 18, but the degree of the fluctuation is relaxed by the fluctuation relaxing mechanisms such as an inclining lever 17, a speed change gear, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a polishing apparatus, i b < is a polishing B station equipped with a grindstone unit 1 for pressing a grindstone against a surface to be processed on a workpiece.

[Prior art 1] Conventionally, this type of grinding machine is shown in Figs. 7(a) and (b).
), it is equipped with a biasing air cylinder 31 for biasing the grindstone 21 onto the processing surface of the workpiece W, and uses the biasing force of the biasing air cylinder 31 to rotate the grindstone 21, which is driven to rotate, onto the workpiece W. There is one that polishes the processed surface by moving the whetstone 21 in the horizontal direction while being in pressure contact with the processed surface. and,
The vertical movement of the grinding wheel 21 caused by the undulations of the machining surface is absorbed within the stroke range of the biasing air cylinder 31, and the whetstone 21 is pressed against the machining surface of the workpiece W even when going up or down the undulations. It is then polished.

[Problems to be Solved by the Invention] However, in the above polishing apparatus, when the grindstone 21 moves up or down the slope of the machined surface of the workpiece W, the pressure force of the grindstone 21 against the machined surface changes. A problem arises. This is due to operating resistance such as sliding resistance of the piston 31a of the urging air cylinder 31.
As shown in FIG. 7(a), when the grindstone 21 is moving up the undulations of the machined surface, the piston 31a is pushed up,
The pressing force of the grindstone 21 increases by the amount of the operating resistance. On the other hand, as shown in FIG. 7(b), when the grindstone 21 is moving down the undulations of the machined surface, it is necessary to push down the piston 31a, so the force of the urging air cylinder 31 that presses the grindstone 21 is activated. It will decrease by the amount of resistance. Therefore, when the grindstone 21 moves up and down the slope of the workpiece W, the desired pressing force cannot be obtained, and there is a problem that the polishing condition deteriorates only at this part of the machined surface.

An object of the present invention is to provide a polishing device that can always press a grindstone against a workpiece surface with an appropriate force, regardless of the undulations of the workpiece surface.

[Means for Solving the Problems] The first invention includes a cylinder for urging a grindstone onto the processing surface of a workpiece, and moves the grindstone while pressing the grindstone against the processing surface by the urging force of the cylinder. In a polishing device that polishes the machined surface and absorbs the movement of the grindstone caused by the unevenness of the machined surface within the stroke range of the cylinder, the pressure contact force of the grindstone that is generated between the cylinder and the grindstone due to the operational resistance of the cylinder The gist of the polishing apparatus is a polishing apparatus equipped with a fluctuation reduction mechanism for reducing fluctuations in the .

The gist of the second invention is a polishing apparatus in which the fluctuation reduction mechanism is a tilting lever having a specific lever ratio in the polishing apparatus of the first invention.

The gist of the third invention is the polishing apparatus of the first invention, in which the fluctuation reducing mechanism is a transmission consisting of a rack and a binion gear.

[Effect 1: The movement of the grinding wheel is absorbed within the stroke range of the cylinder,
The grindstone polishes the processed surface while being pressed against it. The pressing force of the grindstone when polishing a flat part of the processed surface is the same as the biasing force of the cylinder.

When the grinding wheel moves upward or downward due to the undulations formed on the machining surface, the pressure contact force of the grinding wheel fluctuates due to the influence of the cylinder's operating resistance, but the degree of fluctuation can be reduced by reducing the fluctuation of the tilting lever, transmission, etc. Reduced by mechanism.

[Example] Hereinafter, an example in which the present invention is embodied in a mold polishing apparatus for polishing a mold W will be described with reference to FIGS. 1 to 4.

As shown in Fig. 2, a table 2 for installing a mold W is movably provided on the base 1 of the Ken@ machine, and a gate-shaped frame 3 is erected to surround the table 2. has been done. An X-direction movable body 4 is provided on the frame 3 so as to be movable in the horizontal direction, and a Y-direction movable body 5 is provided at the bottom of the X-direction movable body 4 and movable in the horizontal direction orthogonal to the X-direction movable body 4. It is set in. A guide cylinder 6 provided at the upper part of the Y-direction moving body 5 has a two-direction moving shaft 7 movable in the vertical direction.
3 is inserted in the lower part of the Z-direction moving shaft 7 in the horizontal direction.
A head block 8 is provided so as to be adjustable to any angle of 60 degrees.

As shown in FIG. 1.3, a bracket 9 is pivotally attached to the head block 8 so as to be tiltable in the vertical direction, and this bracket 9 is biased by a tilting air cylinder 10 provided on the head block 8. In FIG. 1, it is tilted clockwise. A frame 11 is provided on a guide rail (not shown) of the head block 8 so as to be movable up and down, and this frame 11 is urged downward by an air cylinder 12 for up and down movement provided on the bracket 9. . The tilting air cylinder 10 and the vertical movement air cylinder 12 are used to press a grindstone 21, which will be described later, against the processing surface of the mold W, but since they are not directly related to the main part of the present invention, their explanation will be omitted. Furthermore, these air cylinders 10.degree. 12 can be stopped and held at arbitrary positions, so that the tilting state of the bracket 9 and the vertical position of the frame 11 can be set arbitrarily.

Attachment portions 13 are provided on both sides of the frame 11, and a grindstone unit 14 can be selectively attached to both numbered portions 13.

The grindstone unit 14 will be explained below. As shown in FIG. 1.3, the grindstone unit 14 has its mounting seat 15 mounted on the mounting portion 13 on the left side of the frame 11. Mounting seat 1
A support bracket 16 is fixed to the bracket 1.
A tilting lever 17 serving as a fluctuation reducing mechanism is pivotably mounted on the lower part of the lever 6 so as to be tiltable. A bifurcated cylinder support portion 16a is formed at the upper part of the support bracket 16, and an urging air cylinder 18 is rotatably attached to this cylinder support 71S16a. O of biasing air cylinder 18
The rod 18a is pivotally attached to one end of the tilting lever 17, and the tilting lever 17 tilts around the lower part of the support bracket 16 as the biasing air cylinder 1B operates.

An air motor 19 is removably fixed to the other end of the tilting lever 17, and an output shaft 1 of the motor 19 is directed downward.
9a is connected to the grinding wheel 2 through the universal joint 20.
1 is installed. As described above, this grindstone unit 14 can also be attached to the mounting portion 13 on the right side of the frame 11, and the attachment position is selected depending on the polishing operation.

The universal joint 20 is used to bring the grindstone 21 into close contact with the inclined surface when polishing the inclined surface.

Then, when the rod 18a of the biasing air cylinder 18 protrudes downward, the tilting lever 17 tilts clockwise, the grindstone 21 rises together with the air motor 19, and the rod 18a of the biasing air cylinder 18 retracts upward. Then, the tilting lever 17 is tilted counterclockwise, and the grindstone 21 is lowered together with the air motor 19. Note that the distance between the location where the air motor 19 of the tilting lever 17 is fixed and the pivot location of the support bracket 16 is the same as the pivot location of the support bracket 16 and the pivot location of the urging air cylinder 18. The distance between the two is set to 5@. Therefore, the whetstone 21 moves with a stroke five times the stroke of the urging air cylinder 18, and conversely, the whetstone 21 moves with a stroke five times the stroke of the urging air cylinder 18.
1 is one-fifth of the force generated by the urging air cylinder 18.

Note that the urging air cylinder 18 includes a piston 18b.
Since there is operating resistance such as sliding resistance of the rod 18a and vibration resistance of the rod 18a, a loss of about 1 ka occurs when the rod 18a moves in and out.

Next, a case will be described in which the processed surface of the mold W in which a gentle protrusion is formed is polished by the polishing apparatus configured as described above.

To explain the setting status of each air cylinder 10, 12.18 before polishing work, the tilting air cylinder 10 and the vertical movement air cylinder 12 are held stopped, and therefore,
The bracket 9 is in an upright position, and the frame body 11 is at its lowest position, where movement is prevented.

On the other hand, the urging air cylinder 18 is first operated as shown in FIG. 4(a).
As shown in the figure, pressure is applied to the pressure chamber above the piston 18b to gradually increase the pressure value, and the air cylinder 1
When the rod 18a of No. 8 tilts the tilting lever 17 clockwise to lift the air motor 19, the pressure value at that time is maintained. The air motor 19 is in a balanced state as its own weight is canceled out, and it can move up and down with a small amount of force. Thereafter, as shown in FIG. 4(b), a predetermined pressure is applied to the pressure chamber above the piston 18b of the urging air cylinder 18, and the rod 18a is pulled up with a force of 5 kg.

As mentioned above, since the lever ratio of the tilting lever 17 is 5:1, the grinding wheel 21 is
It will be urged downward by a force of kQ.

After setting each cylinder 10, 12.18 as described above, as shown in FIG.
1 is pressed against the processing surface of the mold W. The grindstone 21 is 1 ka
Since the contact force is 1 ka, the contact force at this time is also 1 ka. After this setting, the grindstone 21 is rotationally driven by the grinding motor 19, and the grindstone unit 14 is moved only in the horizontal direction by the X-direction moving body 4 and the Y-direction moving body 5.
The accompanying movement of the grindstone 21 polishes the entire machined surface.

In the above-mentioned polishing work, since the grindstone 21 does not move up and down when polishing a flat part of the machined surface, it is pressed against the machined surface with a force of 1 kg, which is the same as the biasing force of the biasing air cylinder 18. Become.

On the other hand, as shown in FIG. 4(a), when the grindstone 21 moves up the protrusion on the processing surface, the air motor 19 is pushed up along with the grindstone 21, and the tilting lever 17 is rotated clockwise and biased. Rod 18a of air cylinder 18 for
pull down. Therefore, the upward movement of the grindstone 21 is absorbed by the stroke of the urging air cylinder 18, and the grindstone 21 continues grinding while being pressed against the processing surface.

At this time, the pressing force of the grindstone 21 against the machined surface is 1 kg, which is the urging force originally exerted by the air cylinder 18.
Operating resistance such as sliding resistance of the piston 18b is added. As mentioned above, the air cylinder 18 has an operating resistance of 1 kQ, but considering the lever ratio of the tilting lever 17, the grinding wheel 2
The pressure contact force of No. 1 is reduced to one-fifth of that, 0.2 ko.

Therefore, the grindstone 21 applies a total force of 1.2 kg to the mold W.
It will be pressed against the machined surface.

Further, as shown in FIG. 4(b), when the grindstone 21 descends past the top of the protrusion on the machined surface, the biasing air cylinder 18 pulls up its rod 18a and rotates the tilting lever 17 counterclockwise. The grinding wheel 2 is rotated together with the air motor 19.
1 is lowered to follow the slope of the protrusion on the machined surface.

Therefore, the downward movement of the grindstone 21 is absorbed by the stroke of the urging air cylinder 18, and the grindstone 21 continues grinding while being pressed against the processing surface.

At this time, the pressing force of the grindstone 21 against the machining surface is not 1 kg, which is the urging force originally exerted by the air cylinder 18, and the operating resistance such as the sliding resistance of the piston 18b is subtracted as a loss. In this case as well, the operating resistance of the 1 kg air cylinder 18 can be reduced to 0 by the tilting lever.
2ka, and the grindstone 21 grinds the mold W with a force of 0.8kg.
It will be pressed against the machined surface.

In this way, in the polishing apparatus of this embodiment, the variation in the pressure contact force caused by the operating resistance of the air cylinder 18 can be reduced by the amount that the stroke of the grinding wheel 21 is expanded by the lever ratio of the tilting lever 17, and the result is always good. Polishing can be performed under suitable conditions.

In addition, since the vertical movement stroke of the grinding wheel 21 is expanded by the tilting lever 17, the grinding wheel 21 can move even if the undulation is larger than the stroke of the biasing air cylinder 18.
It can be polished by copying it.

In addition, in the polishing apparatus of this embodiment, the tilting lever 17
Although the lever ratio is fixed, the lever ratio may be changed arbitrarily. Therefore, for example, a long hole is formed in the tilting lever 17, and the air motor 19 is attached to the tilting lever 17 with a bolt through the long hole, so that the position of the air motor 19 with respect to the tilting lever 17 can be changed by loosening the bolt. Good too.

In addition, in the polishing apparatus of this embodiment, the stroke of the biasing cylinder 18 was simply expanded by the tilting lever 17. For example, as shown in FIG. It may be made to constitute a part of the link 22. In this way, the air motor 19 can always be kept upright regardless of the undulations of the processing surface, and better polishing can be performed. Further, as shown in FIG. 6, a rack 23a is used instead of the tilting lever 17.

23b and binion gears 24a, 24b may be used. And the urging air cylinder 18
A drive-side rack 23a that moves up and down together with the rod 18a.
When the small diameter pinion gear 24a is rotationally driven by
Large-diameter binion gear 24 that rotates integrally with this gear 24a
b causes the driven side rack 23b to move up and down with a larger stroke. In this case, the transmission 25 serves as a fluctuation reduction mechanism.

[Effects of the Invention] As detailed above, the polishing apparatus of the present invention has the excellent effect of being able to always press the grindstone against the workpiece surface with an appropriate force, regardless of the undulations of the workpiece surface. to Qin.

[Brief explanation of drawings]

1 to 4 show a mold polishing device embodying the present invention, FIG. 1 is a partial front view showing the grinding wheel unit, FIG. 2 is a front view showing the entire mold polishing device, and FIG. 3 is a front view showing the entire mold polishing device. is a partial side view showing the grinding wheel unit, Figures 4 (a) and (b) are explanatory diagrams showing the grinding wheel unit when polishing undulating parts of the machined surface, and Figure 5 is a diagram showing the grinding wheel unit using a parallel four-bar link. FIG. 6 is a partial front view showing cutting down of the grinding wheel unit. FIG. 6 is a partial front view showing cutting down of the grinding wheel unit using a transmission. FIGS. FIG. 17 is a tilting lever as a fluctuation reduction mechanism; 18 is a biasing air cylinder; 21 is a grindstone; 23a and 23b are racks;
24a and 24b are binion gears, and 25 is a transmission as a fluctuation reduction mechanism. Patent applicant: Nagase Iron Works Co., Ltd.
Person Patent attorney On 1) Joint room (1 idiot) Figure 1 Drawing 1 Figure 14 (b) m4 wJ Drawing 8 Figure 7 (b) H51!1 Drawing 4

Claims (1)

[Claims] 1. A cylinder (18) is provided for urging the grindstone (21) onto the processing surface of the workpiece (W), and the grindstone (21) is pushed by the urging force of the cylinder (18). In a polishing device that polishes the machined surface by moving the grindstone (21) while being in pressure contact with the machined surface, and absorbs movement of the grindstone (21) caused by unevenness of the machined surface within the stroke range of the cylinder (18), Polishing in which a fluctuation reduction mechanism (17, 25) is provided between the cylinder (18) and the grindstone (21) to reduce fluctuations in the pressing force of the grindstone (21) caused by the operating resistance of the cylinder (18). Device. 2. The polishing apparatus according to claim 1, wherein the fluctuation reducing mechanism is a tilting lever (17) having a specific lever ratio. 3. The fluctuation reduction mechanism is a transmission (25) consisting of a rack (23a, 23b) and a pinion gear (24a, 24b).
The polishing apparatus according to claim 1.