JPH0711255U - Component support device for groove processing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To achieve high processing accuracy in a groove processing machine for forming a groove in a component having a rotating shaft. [Configuration] A component support device 1 for mounting a component W having a rotating shaft 2a
The tail center 6 and the movable stopper are rotatably supported, and the groove G is processed by moving the grooved grindstone T toward and away from the rotary shaft 2a by the tool operating means 3 from the radial direction. The tail center is pressed by a hydraulic cylinder. The movable stopper is movable in the axial direction and is biased by the disc spring 10 toward the tail center 6. As a result, the thermal expansion of the component during machining is dispersively absorbed on both sides by the displacement movement of the movable stopper and the tail center, and the inclination of the side face of the machining groove is halved. It is not necessary to extend the cycle time to suppress heat generation, check and correct all parts after processing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a component support device in a groove machining machine for machining a groove on the outer peripheral surface of a rotary shaft of a component.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, as a component supporting device in this type of groove processing machine, for example, those shown in FIGS. 3 and 4 are known. In FIG. 3, the groove machining apparatus includes a component support device 51 for supporting and rotating a component W on which a groove is to be machined, and a machining tool, for example, a rotating groove-shaped grindstone T, on a rotary shaft on the left side of the component W. 52a and tool operating means 53 for moving the tool 52a away from the radial direction.

In the component support device 51, a right rotary shaft 52b, which is concentric with the rotary shaft 52a of the component W in the right side of FIG. 3, is pressed leftward on its axis and is centered and supported. A tail center device 54 is provided for the purpose. The tail center device 54 is capable of moving its tail center 54a in the axial direction by hydraulic pressure. On the other hand, on the left side of the drawing, a stopper 55 is provided for receiving the pressing force of the tail center device 54 via the rotary shaft 52a of the component W and rotating the component W.

The stopper 55 is centered by its tapered surface with respect to the spindle 56, and is fixed by a bolt 57. Further, in order to transmit the rotation of the spindle 56 to the component W, as shown in FIG. 4, a drive plate 60 positioned by a pin 58 and fixed by a bolt 59 is provided on the right side surface of the stopper 55. Further, a drive pin 61 provided on the drive plate 60 is engaged with a pin hole 62 provided on the left end surface of the rotary shaft 52a. The drive plate 60 is embedded in a groove 63 cut in a part of the stopper 55.

Further, a spring center unit 64 is provided inside the spindle 56. The spring center unit 64 has a tapered shank-shaped center sleeve 65 that engages with the tapered inner hole of the spindle 56, and the center 66 is slidable in the axial direction in the inner hole of the center sleeve 65. It is supported by. A taper portion 66a is provided at the right end of the center 66, and the component W is centered by engaging with a taper hole provided at the left end of the rotary shaft 52a.

The tapered portion 66 a is partially cut out so as not to interfere with the drive plate 60. Also, a plug 67 is screwed into the left end of the inner hole of the center sleeve 65, and springs 68 and 69 are provided between the center sleeve 65 and the inner hole 66b provided at the left end of the center 66 so that the center 66 is always attached to the right side. I am energetic. Further, a long groove 70 is provided in the outer surface cylindrical portion of the center 66, and the tip of a set bolt 71 screwed into the center sleeve 65 is engaged with the center groove so as to limit the axial movement of the center 66 and prevent rotation. I am supposed to do it. As a result, the rotary shaft 52a is centered before the stopper 55 contacts the left end of the rotary shaft 52a of the component W and receives the pressing force of the tail center device 54.

That is, in the above structure, first, the part W is fitted to the center line between the center 66 and the tail center 54a in a state where the grooved grindstone T is separated from the center lines of the center 66 and the tail center 54a. Bring to. Then, the tail center 54a is moved in the component direction by the tail center device 54. Then, the tail center 54a engages with the center hole of the rotary shaft 52b of the component W and moves the component W leftward in FIG. 3 while centering.

Eventually, the center hole of the rotating shaft 52 a also engages with the center 66 to compress the springs 68 and 69, so that the part W is centered while the left end surface of the rotating shaft 52 a is on the right side of the stopper 55. It is brought into contact with the surface and pressed by the tail center device 54 with an appropriate force. At the same time, the pin hole 62 provided on the left end surface of the rotary shaft 52a is also engaged with the drive pin 61.

Next, when the spindle 56 is rotated at a low speed, the component W is also rotated at a low speed. Here, the grooved grindstone T is rotated at high speed by the tool operating means 53 and is brought close to the rotary shaft 52a in the radial direction. Then, since the outer peripheral portion of the rotary shaft 52a is pressed by the outer peripheral portion of the grooved grindstone T, the groove G corresponding to the groove shape engraved on the outer peripheral portion of the grooved grindstone T is machined on the outer peripheral portion of the rotary shaft 52a. The Rukoto.

[0010]

[Problems to be solved by the device]

By the way, when the outer peripheral portion of the rotary shaft 52a of the component W is ground by the grooved grindstone T, the temperature of the rotary shaft 52a is a low temperature t1 which is close to the atmospheric temperature at the beginning of grinding, but as the machining progresses, the temperature is By the time the temperature rises and the processing of the groove G is completed, the temperature rises to t2. Therefore, the rotary shaft 52a expands. This expansion amount L2 is expressed by the following equation from the thermal expansion formula, where L2 = L1 × α (t2-t1), where L1 is the length of the rotary shaft 52a and α is the expansion coefficient of the material of the component W. Therefore, for example, when the material material is FC25 (α = 11.7 × 10 ⁻⁶ ) and L1 = 58.5 mm, if t1 = 20 ° C. and t2 = 80 ° C., then L2 = 0. It becomes 041 mm.

The expansion amount L2 = 0.041 mm is absorbed by the displacement of the tail center 54a which is pressed by hydraulic pressure when the stopper position is fixed. Therefore, the groove G to the right of the groove G to be machined on the rotary shaft 52a of the part W in FIG. 3 is formed at a portion which is moving to the right by about 0.04 mm as the temperature rises during machining. Becomes Therefore, when the component W thus processed returns to the atmospheric temperature t1 = 20 ° C., the right side surface G1 of the groove G falls to the right side by about 0.04 mm (measured value 36 to 40 μ) as shown in FIG. It becomes a state. Further, the position of the left side surface G2 moves together with the right side surface G1 by the same amount to the left from the time when the processing is finished.

[0012] Therefore, the required accuracy of the groove G of the component W with respect to the inclination of the groove side surface is ± 0. If it is 02 mm, there arises a problem that if the temperature t2 at the end of processing becomes close to 80 ° C., defective products that are out of specifications continue to appear. In order to prevent the above problems, various measures have been conventionally taken. That is, (1) the cycle time is extended so that the temperature t2 at the end of processing is not increased to, for example, 40 ° C or more. (2) Perform 100% accuracy check and correct defective products later. (3) In turning, rough grooves are processed to reduce the cutting load and suppress heat generation.

However, in any of the conventional measures, there is a problem in that the work efficiency is lowered and the cost is increased. Therefore, in consideration of the above-mentioned conventional problems, the present invention provides a component supporting device for a groove machining machine capable of machining a component within a standard size without lowering work efficiency and without the need for correction and adjustment of the groove tool. The purpose is to provide.

[0014]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a groove processing for rotatably supporting a component having a rotary shaft and processing a groove by moving a groove-shaped tool toward and away from the rotary shaft in the radial direction of the outer peripheral surface thereof. A component support device for a machine, comprising a tail center that presses one end of a rotary shaft of the component and a stopper that receives the other end, the stopper being movable in the axial direction, and the stopper It has an elastic body that urges it toward the center.

[0015]

[Action]

 When one end of the component having the rotating shaft is pressed by the tail center and the other end is pressed against the stopper to properly compress the elastic body of the stopper to support the above component, the stopper is rotated. Parts that have also rotate. While rotating the part, the groove tool is moved closer to the radial direction of the rotation axis. When the groove tool bites into the outer peripheral surface of the rotary shaft, the groove is machined. When the groove machining is completed, the groove tool is separated from the rotary shaft and the tail center is loosened, so that the component is removed from the component support device. Due to the thermal expansion that occurs due to the temperature rise of the rotating shaft during the above groove machining, the side surface of the machining groove collapses when the parts are removed and returned to the ambient temperature, but this thermal expansion is dispersed and absorbed on both sides of the tail center and the movable stopper. Since the tilt of the groove side surface is reduced by half, the accuracy of the groove side surface tilt is improved.

[0016]

【Example】

 1 and 2 are cross-sectional explanatory views showing an embodiment of the present invention. The groove processing machine includes a component support device 1 for supporting and rotating a component W on which a groove is to be machined, and a tool operating means for moving a grooved grindstone T as a grooved tool closer to and away from the radial direction of the component W. 3 is provided. The component support device 1 is provided with a tail center device 4 for pressing the right rotation shaft 2b of the component W to the left and for centering and supporting the rotation shaft 2b on the right in FIG. The tail center device 4 can move the tail center 6 left and right by means of a hydraulic cylinder 5.

A movable stopper 7 for receiving the pressing force of the tail center device 4 via the rotary shaft 2a of the component W is provided on the left side of the component support device 1 in FIG. The movable stopper 7 is sandwiched between the set ring 8 and the stopper base 9 and is movable in the axial direction by a very small amount, for example, 0.06 mm or more. Further, a disc spring 10 and an adjustment spacer 11 are sandwiched between the back surface of the movable stopper 7 (the left side surface in FIG. 1) and the stopper base 9 so that the movable stopper 7 is always mounted on the tail center device 4. Urged in the direction.

The stopper base 9 is centered by its tapered surface with respect to the spindle 12 and fixed by a bolt 13. Further, in order to transmit the rotation of the spindle 12 to the component W, the set ring 8 is guided by the stopper base 9 and fixed by a bolt 14, and at the right side of the set ring 8 in FIG. As also shown in FIG. 2, a drive plate 17 is provided which is positioned with pins 15 and fixed with bolts 16. Further, the drive pin 18 provided on the drive plate 17 is adapted to be engaged with the pin hole 19 provided on the left end surface of the rotary shaft 2a.

The drive plate 17 is embedded in a groove 8 a formed in a part of the set ring 8. Further, a notch 7a is provided on the right side of the movable stopper 7 in FIG. 1 so that the drive plate 17 does not hinder the movement of the movable stopper 7. Further, a spring center unit 20 is provided in the spindle 12 for centering the rotary shaft 2a.

The spring center unit 20 has a tapered shank-shaped center sleeve 21 that engages with the tapered inner hole 12 a of the spindle 12, and the center 22 is provided in the inner hole 21 a of the center sleeve 21. It is provided so as to be slidable in the axial direction. A taper portion 22a is provided at the right end of the center 22 and is engaged with a tapered center hole provided at the left end of the rotary shaft 2a to center the component W. A plug 23 is screwed into the left end of the inner hole 21a of the center sleeve 21, and a guide pin 24 is provided at the center of the plug 23 so as to project rightward.

Between the right surface of the plug 23 and the left end surface of the center 22, a disc spring unit 25 composed of a large number of disc springs is provided guided by the guide pin 24, so that the center 22 is always on the right side. Is being urged toward. Further, a long groove 22b is provided in the outer peripheral cylindrical portion of the center 22, and the tip end of the set bolt 26 screwed into the center sleeve 21 is engaged with the long groove 22b to limit the movement of the center 22 in the axial direction. At the same time, it also serves as a detent.

When the movable stopper 7 contacts the left end of the rotary shaft 2 a of the component W, the spring center unit 20 centers the rotary shaft 2 a before receiving the pressing force of the tail center device 4. The movable stopper 7 has a dust seal oil seal 27 and an O-ring 28 in order to prevent coolant, cutting fluid, and dust for increasing machining efficiency from entering the spindle 12 and the spring center unit 20. Is provided.

Further, the tool operating means 3 rotatably supports the grooved grindstone (grooved tool) T and is rotated by a drive motor (not shown), and by a hydraulic cylinder (not shown). The grooved grindstone T is made to approach and separate from the rotary shaft 2a of the component W in the radial direction.

The present embodiment is configured as described above. First, with the grooved grindstone T separated from the center lines of the center 22 and the tail center 6, the part W is placed between the center 22 and the tail center 6. Bring it in along the line. Then, the tail center device 4 is operated to move the tail center 6 in the component W direction. The tail center 6 engages with the center hole of the rotary shaft 2b of the component W, and moves the component W leftward in FIG. 1 while centering. Eventually, the center hole of the rotary shaft 2a also engages with the center 22 to compress the disc spring unit 25, so that the left end face of the rotary shaft 2a comes into contact with the right side face of the movable stopper 7 while centering the component W. To be done. Then, the tail center device 4 presses a predetermined pressing force, for example, the pressure of the pressing cylinder 5 at 6 Kg / cm ² when the moving amount of the movable stopper 7 is 0.01 mm. At this time, the pin hole 19 provided on the left end surface of the rotary shaft 2a is also engaged with the drive pin 18.

Next, when the spindle 12 is rotated at a low speed, the component W is also rotated at a low speed. At the same time, the tool operating means 3 is operated to rotate the grooved grindstone T at a high speed to bring it closer to the rotary shaft 2a in the radial direction. Then, since the outer peripheral portion of the rotary shaft 2a is pressed and ground by the outer peripheral portion of the grooved grindstone T, the outer peripheral portion of the rotary shaft 2a has a groove G corresponding to the groove shape engraved on the outer peripheral portion of the grooved grindstone T. Is processed.

Here, as described above, in the process in which the grooved grindstone T rotating at a high speed comes into contact with the rotary shaft 2a of the component W and the outer peripheral portion is ground, the temperature of the rotary shaft 2a becomes the initial stage of grinding. Considering the case where the temperature rises from about 80 ° C to about 80 ° C at the end of processing, this temperature rise causes the rotary shaft 2a to gradually expand as described above, and finally the expansion amount of 0.04 mm, for example. Becomes This expansion amount is pushed to the left and right to be absorbed.

That is, to the left, the movable stopper 7 is moved to the left, for example, 0.02 mm, against the biasing force of the disc spring 10. Further, to the right, the tail center 6 is moved to the right, for example, 0.02 mm, against the compressive force of the hydraulic oil that is sealed inside the hydraulic cylinder 5 and that is continuous with the hydraulic cylinder 5. Therefore, when the groove G formed on the rotating shaft 2c whose temperature has changed from 20 ° C. to 80 ° C. during processing is returned to the temperature after being removed from the component supporting device 1, the groove G of the rotating shaft 2c is removed. The tilt of the right side surface of the groove G on the right side is suppressed to about 0.02 mm. Further, the tilt of the left side surface of the groove G on the left side is similarly suppressed to about 0.02 mm. Then, as the groove located between the above-mentioned two grooves becomes closer to the central portion, the inclination of the groove side surface becomes smaller. As a result, any groove falls within the specification of the amount of tilt ± 0.02 mm.

As described above, according to the present embodiment, the thermal expansion of the component W generated during the processing is absorbed by the displacement of the movable stopper 7 and the tail center 6 to the left and right, so that the processing groove G caused by the thermal expansion is generated. The tilt of the side surface can be halved as compared with the conventional technique. Therefore, the processing cycle time can be shortened, and since it is not necessary to perform a 100% accuracy check and correct defective products in a later process, the work efficiency can be improved. Further, there is no need for rough machining to suppress heat generation, and economical effects such as reduction of rough groove machining tools can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, but can be implemented in other modes by making appropriate changes. For example, in the embodiment, the tail center 6 for absorbing thermal expansion is displaced and moved by the spring property due to the compressibility of the sealed hydraulic oil in the hydraulic cylinder 5 and the pipe connected thereto, but instead of this, the hydraulic cylinder 5 is used. A disc spring similar to the disc spring 10 for urging the movable stopper 7 may be disposed between the tail center 6 and the tail center 6 for displacement movement. However, in this case, the hydraulic cylinder 5 should be used to move the tail center 6 largely, and its volume should be made as small as possible in order to give the closed working oil rigidity.

[0030]

[Effect of device]

 As described above, according to the present invention, in a component supporting device in a groove processing machine that supports a rotary shaft of a component by a tail center and a stopper, the stopper is movable in the axial direction and the stopper is moved in the tail center direction. Since it is equipped with an elastic body that urges, the thermal expansion of parts that occurs during machining is dispersed and absorbed on both sides by the displacement movement of the movable stopper and tail center, and the tilt of the side surface of the machining groove due to thermal expansion is halved. As a result, the processing accuracy is improved. As a result, thermal expansion is allowed to some extent, and the cycle time can be shortened, and in addition, there is no need to check the accuracy of all products and to correct defective products, thus improving work efficiency. In addition, since it is not necessary to perform rough groove machining to prevent the side surface of the machined groove from collapsing due to thermal expansion, it is possible to obtain the effects of reducing the number of processes and cutting tool costs.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing an embodiment of the present invention.

FIG. 2 is a right side view around a movable stopper in FIG.

FIG. 3 is an axial sectional view of a conventional example.

FIG. 4 is a right side view around the stopper in FIG.

FIG. 5 is an enlarged cross-sectional view showing the shape of the groove of the component that has returned to the ambient temperature after the groove processing in the conventional example.

[Explanation of symbols]

 1 Parts Supporting Device 2a, 2b Rotating Shaft 3 Tool Operating Means 4 Tail Center Device 5 Hydraulic Cylinder 6 Tail Center 7 Movable Stopper 7a Notch 8 Set Ring 8a Groove 9 Stopper Base 10 Disc Spring (Elastic Body) 11 Adjusting Spacer 12 Spindle 15 pin 17 drive plate 18 drive pin 20 spring center unit 21 center sleeve 22 center 23 plug 24 guide pin 25 disc spring unit 51 component support device 52a, 52b rotary shaft 53 tool operating means 54 tail center device 54a tail center 55 stopper 56 spindle 60 Drive Plate 61 Drive Pin 63 Recessed Groove 65 Center Sleeve 66 Center 67 Plug 68, 69 Spring 70 Long Groove G Groove T Groove Whetstone (Groove Tool) W Parts

Claims (1)

[Scope of utility model registration request] 1. A component supporting device in a groove machining machine, which rotatably supports a component having a rotary shaft, and causes a groove-shaped tool to approach and separate from the radial direction of the outer peripheral surface of the rotary shaft to machine a groove. The component has a tail center that presses one end of the rotary shaft of the component, and a stopper that receives the other end. The stopper is movable in the axial direction, and an elastic body that urges the stopper in the tail center direction. A component supporting device in a groove processing machine, which is characterized by being provided.