JP2023022501A - Groove grinding device - Google Patents

Abstract

To provide a grinding device that is capable of using a general whetstone in an easily replaceable manner instead of using a special whetstone when grinding a groove, and can perform machining work of a groove extremely accurately.SOLUTION: Provided is a rotational shaft 11 that penetrates a disk-shaped whetstone 10. Provided is a pair of support bodies 12 that pivotably supports both ends of the rotational shaft 11 and is inserted into a work-piece W. Provided is a pair of rotary gears 13 parallelly arranged for both sides of the whetstone 10 of the rotational shaft 11. Provided is a fixing nut 14 that screw-fastens and fixes each rotary gear 13 and the whetstone 10 to the rotational shaft 11. Provided is a pair of interlocking gears 15 that meshes with each rotary gear 13. Provided is a drive gear 16 that simultaneously meshes with each interlocking gear 15 in a parallel state. Provided is a drive transmission mechanism 20 that transmits driving force to the drive gears 16.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding apparatus used, for example, for machining vane grooves in a cylinder constituting a rotor for a vane pump of a rotary compressor.

Forming a rotor for a vane pump involves machining vane grooves inside a disk-shaped cylinder. This work consists of grinding the precise vane grooves along the lower grooves pre-formed in the cylinder. Patent Literature 1 discloses an apparatus for grinding vane grooves with a disk-shaped grindstone.

This device uses a whetstone that can be inserted into the hole of the cylinder, and has a V-shaped belt groove on the outer periphery of the disk-shaped whetstone, and the whetstone is rotated by a belt hung in this groove. . Then, a grindstone is inserted in parallel into the lower groove of the cylinder, and after grinding one of the opposing surfaces of the lower groove, the position of the grindstone is shifted and the other surface is ground.

Thus, an ultra-thin grindstone is used to grind the opposing surfaces in the lower groove one by one. Such ultra-thin whetstones are generally available on the market, but this machine uses a special whetstone with a V-shaped belt groove on the outer circumference of the whetstone and a thick rotating shaft.

Furthermore, since the vane grooves are ground in units of microns, if the grinding width of the grindstone is preliminarily formed by a dresser and then mounted on the apparatus, the runout accuracy of the grindstone becomes a problem during mounting. Therefore, this device is provided with static pressure means called a hydrostatic pocket coolant, and is configured to restrain the whetstone in the axial direction so as to suppress runout of the whetstone.

On the other hand, Patent Document 2 describes a spindle for groove grinding. This groove grinding spindle grinds a groove having a U-shaped cross section in a work. By adopting a configuration in which the rotational force is transmitted to one end of the grindstone shaft, the grindstone can be easily replaced without removing the bearing of the grindstone shaft.

Further, Patent Document 3 describes a work groove polishing method and polishing apparatus previously proposed by the present applicant. In this groove polishing method, a pair of grindstones having a grinding width adjusted to match the width of the vane groove are arranged on both sides of the work, and these grindstones are alternately inserted into the lower groove so that the processed surfaces are aligned. This is a method of grinding vane grooves.

Japanese Patent No. 3539090 JP-A-7-314311 Japanese Patent No. 6847484

The grinding machine described in Patent Document 1 has a V-shaped belt groove on the outer periphery of the grindstone in order to transmit a rotational force to the grindstone, and a special grindstone that rotates the grindstone via a belt hung on the belt groove. are using. Therefore, in order to replace the worn grindstone, the belt must be removed before replacement, which makes the replacement work difficult.

Moreover, this grinding apparatus uses a shaft-integrated grindstone base metal to suppress deflection of the grindstone, and is equipped with static pressure means called a hydrostatic pocket coolant for restraining the grindstone in the axial direction. Therefore, there is a problem that the structure of the grinding device itself becomes complicated, and the manufacturing cost of the device increases due to the use of a special grindstone.

On the other hand, the groove grinding spindle described in Patent Document 2 has a configuration in which a rotational force is transmitted to one end side of the grindstone shaft when rotating the grindstone. Therefore, the strength of this grindstone is limited to the use of a strong grindstone capable of grinding a groove having a U-shaped cross section in a work while withstanding one-sided driving. Therefore, it is not suitable for fine grinding on the order of microns, such as grinding vane grooves.

In addition, in the method and apparatus for polishing grooves of a workpiece described in Patent Document 3, two grindstones are used when processing one groove of the vane, so there is a problem in the processing cost and the manufacturing cost of the apparatus.

Therefore, the present invention was created to solve the above-mentioned problems, and when machining vane grooves of cylinders, etc., it is possible to use general grindstones easily without using special grindstones. It is an object of the present invention to provide a grinding apparatus capable of extremely accurately processing grooves.

In order to achieve the above object, the first means in the present invention is a rotary shaft 11 mounted on the tip side of the main body 1 of the apparatus and supporting a disk-shaped grindstone 10, and both ends of the rotary shaft 11 are supported. A pair of supports 12 inserted into the work W, a pair of rotary gears 13 arranged parallel to both sides of the grindstone 10 of the rotary shaft 11, and each rotary gear 13 and the grindstone 10 fixed to the rotary shaft 11 by screws. a pair of interlocking gears 15 meshing with each rotating gear 13; a drive gear 16 simultaneously meshing with each of the interlocking gears 15 in a parallel state; 20 and .

The second means is that one of the supports 12 is fixed to a support portion 2 provided on the tip side of the main body 1, and the other of the supports 12 is a fixed plate detachably provided on the main body 1. 17 is fixed to the tip side.

The interlocking gear 15 of the third means is connected to one rotary shaft 19 provided on the main body 1 and the other rotary shaft 19 provided on a fixed plate 17 detachably provided on the main body 1, respectively. is worn.

In the fourth means, the end of the rotary shaft 11 supported by the support 12 fixed to the main body 1 is supported via two bearings 18 .

A fifth means is provided with a width dresser 30 for adjusting the grinding width of the grindstone 10 and a grindstone rail body 31 for movably supporting the width dresser 30. The width dresser 30 moves on the grindstone rail body 31. , the grinding wheel width of the grinding wheel 10 supported on the rotating shaft 11 is adjusted.

According to the present invention, a pair of rotating gears 13 arranged in parallel on both sides of the grinding wheel 10 of the rotating shaft 11, a fixing nut 14 for screwing and fixing each rotating gear 13 and the grinding wheel 10 to the rotating shaft 11, and each rotating gear A pair of interlocking gears 15 meshing with the gears 13 and a driving gear 16 simultaneously meshing with the parallel interlocking gears 15 are provided, so that a general grindstone can be easily replaced.

Moreover, since a pair of interlocking gears 15 meshing with each rotating gear 13 and a driving gear 16 simultaneously meshing with each interlocking gear 15 in a parallel state are provided, the rotating shafts 11 on both sides of the grindstone 10 are equally rotated. can be transmitted, and an accurate and powerful rotational force can be obtained. As a result, unlike the conventional art, a special configuration in which a belt groove is provided on the outer periphery of the grindstone and the grindstone is rotated by the belt is no longer required.

Further, the interlocking gear 15 is attached to one rotary shaft 19 provided on the main body 1 and the other rotary shaft 19 provided on a fixed plate 17 detachably provided on the main body 1, respectively. , the replacement of the grindstone 10 becomes extremely easy.

The support 12 on the side fixed to the main body 1 supports the end of the rotating shaft 11 via two bearings 18, so that the load applied from the main body 1 is distributed to the end of the rotating shaft 11. This prevents the rotating shaft 11 from wobbling during grinding, enabling accurate grinding.

Further, since the width dresser 30 moving on the grindstone rail body 31 adjusts the width of the grindstone 10 supported on the rotary shaft 11, the width of the grindstone 10 is adjusted when the grindstone 10 is mounted on the rotary shaft 11. It completely eliminates deflection and blurring, and enables extremely accurate grinding.

It is a schematic sectional drawing which shows the grinding state of this invention. FIG. 3 is an exploded cross-sectional view of a support showing a state in which the grindstone of the present invention is fixed; FIG. 4 is an exploded cross-sectional view showing an example of a fixed plate and an interlocking gear according to the present invention; It is a schematic sectional view showing the main body tip side of the device of the present invention. It is a schematic side view showing the main body tip side of the device of the present invention. It is explanatory drawing which shows the grinding state of the grindstone of this invention. 1 is a schematic side view showing an example of a width dresser and a grindstone rail body of the present invention; FIG. It is explanatory drawing which shows the movement state of the width dresser of this invention.

The present invention is, for example, a groove grinding apparatus for forming vane grooves by grinding lower grooves W1 for vane grooves provided inside a disk-shaped workpiece W which is a cylinder when forming a rotor for a vane pump or the like. .

The main components for supporting the disk-shaped grindstone 10 in the grinding machine of the present invention include a rotary shaft 11, a support 12, a rotary gear 13, a fixed nut 14, an interlocking gear 15, a drive gear 16, and a drive transmission mechanism 20. (see Figure 4).

A commercially available grindstone 10 is used as the grindstone 10 . That is, it consists of a "grinding layer" portion containing abrasive grains such as a diamond grindstone or a CBN grindstone, and a disk-shaped "base metal" portion fixing the grinding layer. The whetstone 10 is provided with abrasive layers on both sides of the disc from the circumference of the base metal, and the portions formed on both sides of the disc from the peripheral edge serve as grinding portions. Therefore, the thickness of the disk at the portion where the abrasive layer is provided becomes the grinding width. In the present invention, such disc-shaped grindstone 10 is used.

The rotary shaft 11 is a member for fixing the grindstone 10, and a pair of supports 12 support both sides of the rotary shaft 11 passing through the grindstone 10 (see FIG. 3). At this time, a pair of rotary gears 13 arranged in parallel on both sides of the grindstone 10 are arranged on the rotary shaft 11 , and the grindstone 10 and the rotary gear 13 are fixed to the rotary shaft 11 with a fixing nut 14 .

The supports 12 are a pair of members that support both ends of the rotary shaft 11 and are inserted into the work W (see FIG. 1). One support 12 is fixed to a support 2 provided on the tip side of the main body 1 (see FIG. 2). The other support 12 is fixed to a fixed plate 17 . The fixing plate 17 is a plate-like member arranged on the side of the fixing nut 14 and is detachably attached to the main body 1 (see FIG. 3).

In the illustrated example, two bearings 18 are provided in parallel on one support 12 fixed to the main body 1 to firmly support the end of the rotating shaft 11 on the main body 1 side.

Then, the support 12 is inserted into the through hole W2 previously formed in the work W, and the lower groove W1 similarly formed in the work W is ground by the grindstone 10 to form a predetermined width, thereby forming vane grooves and the like. (see Figure 1).

The interlocking gears 15 are a pair of gears meshing with the rotary gears 13, and are arranged in parallel on both sides of the grindstone 10 (see FIG. 4). One of the interlocking gears 15 is attached to a rotating shaft 19 provided on the main body 1, and the other interlocking gear 15 is attached to a rotating shaft 19 provided on a fixed plate 17 (see FIG. 3). . This fixing plate 17 is a member that fixes the other supporting body 12 described above, and is detachably provided on the main body 1 .

Therefore, in order to replace the used grindstone 10 , the fixing plate 17 is removed from the main body 1 and separated from the main body 1 together with the other dynamic gear 15 . Next, when the fixing nut 14 is removed, the grindstone 10 is removed from the rotary shaft 11 together with the rotary gear 13 (see FIG. 3). Also, when mounting a new grindstone 10, it can be easily exchanged by reversing this procedure.

The driving gear 16 is a gear meshing with each of the interlocking gears 15 in parallel at the same time, and the driving gear 16 is rotationally driven by the driving force from the drive transmission mechanism 20 (see FIG. 4). The illustrated drive transmission mechanism 20 uses a pair of pulleys 22 and a belt 23 interlocked with an electric motor 24 to rotate the drive gear 16 via a rotary shaft 21 axially attached to the drive gear 16 .

The grinding wheel width of the grinding wheel 10 can be adjusted with the grinding wheel 10 fixed to the rotating shaft 11, thereby enabling extremely accurate adjustment (see FIG. 6). Therefore, in the present invention, a width dresser 30 for adjusting the grinding width of the grindstone 10 and a grindstone rail body 31 for movably supporting the width dresser 30 are provided (see FIGS. 7 and 8). A width dresser 30 that moves on a whetstone rail body 31 adjusts the whetstone width of the whetstone 10 supported on the rotating shaft 11 (see FIG. 8).

The width dresser 30 is a tool called a diamond dresser, and is used for forming (forming) general grindstones, diamond/CBN wheels, and for correcting outer peripheral deflection. The illustrated width dresser 30 uses a rotating rotary dresser having diamonds embedded in the outer peripheral portion thereof.

Then, the abrasive layer portion of the grindstone 10 is sandwiched between a pair of width dressers 30 arranged to face each other, and the abrasive layer width is formed to the working width of the lower groove W1 (see FIGS. 6 and 8). By adjusting the grinding width of the grindstone 10 while it is fixed to the rotary shaft 11 in this manner, even a slight run-out that occurs when the grindstone 10 is attached to the rotary shaft 11 can be eliminated, and grinding can be performed extremely accurately in micron units. become a thing.

The illustrated grindstone rail body 31 is fixed to the main body 1 of the apparatus of the present invention (see FIG. 7). Then, the width of the grinding layer of the grinding wheel 10 fixed to the rotating shaft 11 is adjusted by the width dresser 30 movably provided on the grinding wheel rail body 31, and the grinding wheel 10 is moved again on the grinding wheel rail body 31 to the position of the lower groove W1 of the workpiece W. It moves the main body 1 (see FIGS. 6 and 8). At this time, it is also possible to fix the whetstone rail body 31 to the main body 1 in a detachable manner.

In the present invention, the structures of the grindstone 10, the rotating shaft 11, the support 12, etc. are not limited to those shown in the drawings, and can be freely changed in design without changing the gist of the present invention. Moreover, the use example of this invention is not limited, either.

W work W1 lower groove W2 through-hole 1 main body 2 support 10 grindstone 11 rotating shaft 12 supporting body 12A fixing bolt 13 rotating gear 14 fixing nut 15 interlocking gear 16 driving gear 17 fixing plate 17A fixing bolt 18 bearing 19 rotating shaft 20 drive transmission mechanism 21 Rotating shaft 22 Pulley 23 Belt 24 Electric motor 30 Width dresser 31 Grindstone rail body

In order to achieve the above object, the first means in the present invention is a rotary shaft 11 mounted on the tip side of the main body 1 of the apparatus and supporting a disk-shaped grindstone 10, and both ends of the rotary shaft 11 are supported. A pair of supports 12 inserted into the work W, a pair of rotary gears 13 arranged parallel to both sides of the grindstone 10 of the rotary shaft 11, and each rotary gear 13 and the grindstone 10 fixed to the rotary shaft 11 by screws. a pair of interlocking gears 15 meshing with each rotating gear 13; a driving gear 16 simultaneously meshing with each of the interlocking gears 15 in a parallel state; a pair of rotating shafts 19, one of which is provided on the main body 1 and the other is provided on the fixed plate 17; is detached from the rotating shaft 11 together with the rotating gear 13 .

In order to achieve the above object, the first means in the present invention is a rotary shaft 11 mounted on the tip side of the main body 1 of the apparatus and supporting a disk-shaped grindstone 10, and both ends of the rotary shaft 11 are supported. A pair of supports 12 inserted into the work W, a pair of rotary gears 13 arranged parallel to both sides of the grindstone 10 of the rotary shaft 11, and each rotary gear 13 and the grindstone 10 fixed to the rotary shaft 11 by screws. a pair of interlocking gears 15 meshing with each rotating gear 13; a driving gear 16 simultaneously meshing with each of the interlocking gears 15 in a parallel state; A pair of rotating shafts 19, one of which is provided on the main body 1 and the other is provided on the fixed plate 17, a pair of interlocking gears 15 to which the rotating shafts 19 are attached, and a driving gear 16. and a driving transmission mechanism 20, and when the fixing plate 17 and the fixing nut 14 are removed from the main body 1 when replacing the grindstone 10, the grindstone 10 is detached from the rotating shaft 11 together with the rotary gear 13.

Claims (5)

a rotating shaft mounted on the tip side of the main body of the device and supporting a disk-shaped grindstone;
a pair of supports that support both ends of the rotating shaft and are inserted into the work;
a pair of rotating gears arranged in parallel on both sides of the grinding wheel of the rotating shaft;
a fixing nut for screwing and fixing each rotary gear and grindstone to the rotary shaft;
a pair of interlocking gears meshing with each rotating gear;
a driving gear meshing with each interlocking gear in parallel at the same time;
a drive transmission mechanism that transmits a driving force to the drive gear;
A groove grinding device comprising: 2. One of the supports is fixed to a support provided on the tip side of the main body, and the other of the supports is fixed to the tip side of a fixing plate detachably provided on the main body. A groove grinding apparatus as described. 2. Groove grinding according to claim 1, wherein said interlocking gear is attached to one rotary shaft provided on said main body and the other rotary shaft provided on a fixed plate detachably provided on said main body, respectively. Device. 2. The groove grinding apparatus according to claim 1, wherein the end portion of said rotating shaft supported by said support fixed to said main body is supported via two bearings. A width dresser for adjusting the grinding width of the grindstone and a grindstone rail body for movably supporting the width dresser are provided, and the grindstone is supported on the rotating shaft by the width dresser that moves on the grindstone rail body. 2. The grooving machine according to claim 1, wherein the width of the grinding wheel is adjusted.

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