JP3021066B2 - Screw grinder with opposed wheel head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread grinder, and more particularly to a thread grinder suitable for grinding a long screw shaft.

[0002]

2. Description of the Related Art Conventionally, a long screw having a single diameter has a low rigidity. When grinding with a screw grinder, chattering occurs or a workpiece is elastically deformed, and the axis of the screw is displaced during grinding. Accuracy, especially variation in screw diameter, is likely to occur. In the case of thread grinding such a work piece having no rigidity, an anti-sway is generally used.

[0003]

A screw shaft whose length is significantly larger than its diameter has no rigidity and is opposed to a grinding force. Therefore, a shoe is applied to an outer diameter portion of the screw shaft. The screw shaft is hardened by turning the screw with grinding allowance by turning and has high hardness. Then, the shoe comes into contact with the screw crest, and the shoe exerts a large pressure due to the grinding force. For this reason, the shoe is easily worn, and the top of the screw and the corner of the flank where the width of the screw top is narrowed move in the axial direction due to the rotation of the screw shaft, so that the shoe is easily shaved. Therefore, it is necessary to drive and match the shoes during processing, which involves adjustment of the shoe position of the anti-sway. Since the number of such anti-skids increases as the length of the workpiece increases and supports the workpieces, it takes time to adjust the anti-sway during processing. This point is generally described in a little more detail in the processing of a long workpiece, and a workpiece is subjected to a grinding force obtained by combining a main component force and a back component force of the grinding resistance. A two-point anti-sway device having a shoe that receives the main component and a shoe that receives the component by a back force is generally used. In this case, the shoe subjected to the back force directly affects the grinding accuracy and must be sent to a predetermined position with respect to the workpiece. Further, since a large force is applied to the shoe which receives the main component force, the shoe can be placed at a retreated position to some extent by utilizing the elasticity of the workpiece in consideration of the wear resistance. Therefore, in the case of adjusting the anti-skid, the shoes that receive the back force may be simply and independently positioned at the same position with respect to the workpiece diameter, but the shoes that receive the main component are the axially arrayed anti-skid. It is necessary to adjust the feeding amount to the workpiece in accordance with the mode of supporting. For the reasons described above, it is time-consuming to adjust the anti-sway. Therefore,
The number of anti-skids is kept to a minimum and limits the cutting depth of the grinding wheel.

[0004] Since the above-mentioned thread grinding is performed, the amount of cut is small, and the processing time is remarkably increased due to the anti-sway adjustment. One shoe is associated with two shoes having different directions in relation to each other and the positions of the shoes are related to each other, so that a very high level of skill is required, and it is difficult to improve the grinding accuracy.

The present invention has been made in view of the above points, and an object of the present invention is to provide a screw grinding machine which can improve grinding accuracy, reduce the number of anti-skids, and have good grinding efficiency.

[0006]

The first invention of the present invention has a long
In a screw grinder provided with a screw grinding feed means for keeping the ratio of the rotation of the work of the scale and the relative movement of the grinding wheel and the work in the axial direction constant, the machine base and the machine base are reciprocally movable. A saddle, a drive device for the saddle, a work headstock and a tailstock provided oppositely on a line parallel to the saddle moving direction on the machine, and a center line of the work on the saddle, and Vertical
The slide supported via the turning position adjustment device having the vertical axis as the center of rotation, and the center line of the workpiece supported by the headstock and the tailstock are substantially at the same position as the position at which the vertical axis passes . On both sides of the workpiece, there is a screw grinder provided with two opposed grinding wheel heads provided on a slide so as to be able to advance and retreat toward the workpiece, and an opposed grinding wheel head provided with a driving device for the grinding wheel head.

According to a second aspect of the present invention, a driving device for a grinding wheel head has a feed screw connected by an integral or interlocking device disposed in a cutting direction of the grinding wheel head. Wherein the nuts respectively screwed into the screw portions are attached to the respective grinding wheel heads.
A screw grinder provided with the opposed grinding wheel stand according to the invention.

A third invention of the present invention is characterized in that at least one of the nuts attached to each wheel head is rotated so as to be immovable so that the position in the rotation direction can be adjusted. And a screw grinder provided with the opposed grinding wheel head described in the above.

According to a fourth aspect of the present invention, there is provided a driving device for a wheel head, a servo motor provided for each wheel head, a screw feeder for connecting the servo motor and the wheel head, and a numerical controller for controlling the servo motor. A screw grinder provided with the opposed grinding wheel head according to the first invention, characterized by having:

According to a fifth aspect of the present invention, there is provided an opposed grinding wheel head according to any one of the first to fourth inventions, wherein the rotating directions of the grinding wheels of the two wheel heads are the same. It is a screw grinder equipped with.

According to a sixth aspect of the present invention, there is provided an opposed wheel head according to any one of the first to fifth aspects, wherein the rotating directions of the wheels are opposite to each other. It is a screw grinder provided with.

A seventh aspect of the present invention is the first to fifth aspects of the present invention, wherein at least one of the main motors for driving the grindstones provided on the grindstone heads of both grindstone heads is capable of normal and reverse rotation. A screw grinder provided with the opposed grinding wheel stand according to any one of the above.

An eighth invention of the present invention comprises a grindstone correcting device acting on a grindstone at a retracted position of a grindstone base, and disposing a grindstone correcting tool at a position opposite to a position where each grindstone acts on a workpiece. A screw grinder provided with the opposed wheel head according to any one of the first to seventh inventions.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view, and FIG.
FIG. 3 is a cross-sectional view taken along line CC of FIG. 2.

A so-called mountain corner guide 2 provided on a machine base 1
The saddle 3 slides on the machine 1, and the saddle 3 is reciprocally movable on the machine base 1. A feed nut 4 is fixed to the saddle 3, and a lead screw 5 parallel to the guide 2 is screwed into the feed nut 4. The feed nut 4 is detachable from the lead screw 5 or the feed nut 4 is engaged with the lead screw 5 and rotated and fixed to a nut case 80 fixed to the saddle 3 by an external operation. . These components are the same as those of the threading device provided in the lathe apron, and are well-known, and thus description thereof is omitted. The lead screw 5 is connected to the output side of a replacement gear box 6 fixed to the machine base 1. The input shaft of the exchange gear box 6 is connected to the work spindle 8 in the work headstock 7 by a gear, and the inside thereof is connected to the work spindle 8 with respect to the lead screw 5 in which a precise thread is formed. The gear train is selectively engaged so as to rotate at various fixed rates. This meshing is performed by a lever which is connected to a member for shifting gears in the exchange gear box 6 (not shown) and is out of the exchange gear box 6. Further, in combination with the above, a part of the gear pair can be easily replaced manually. The work headstock 7 is mounted on the machine base 1 in the reciprocating direction of the saddle 3.
Is fixed, and a tailstock 9 is fixed to the work headstock 7 so that the position of the tailstock 9 can be adjusted. The workpiece headstock 7 is inputted from the upper electric motor 10 via the belt device 11 and the rotation is transmitted to the workpiece spindle 8 via the internal reduction gear. The workpiece W has a center 12 that fits into the workpiece spindle 8 and a sleeve 13 whose access to the tailstock 9 is adjusted.
Is supported by a center 14 that fits in the center. The workpiece W is rotated by a driving tool 16 engaged with a turn 15 fixed to the workpiece W. The driving tool 16 is fixed to the workpiece spindle 8.

The grindstone heads 18 and 118 which face the workpiece W supported by the workpiece headstock 7 and the tailstock 9 obliquely toward and away from both sides at substantially the same position in the axial direction are placed on one slide 17. In preparation. For this reason, the slide 1
The guides 19 and 119 are provided so as to be oblique to the guide 2 of the first embodiment, and the respective wheel head main bodies 21 and 121 are in sliding contact with the guides 19 and 119. Guide 1 for the wheel head main bodies 21 and 121 respectively
Grinding stone shafts 22 and 122 orthogonal to 9 and 119 are rotatably supported. The main motors 23 and 123 provided on the wheel head main bodies 21 and 121 and the wheel shafts 22 and 122 are connected by belt devices 24 and 124. Cylindrical grindstones 25 and 125 are attached to the grindstone shafts 22 and 122. The grindstones 25 and 125 are on opposite sides of the diameter of the workpiece W, and a grinding action portion is provided at a position separated by half a pitch of a screw formed on the workpiece W in the axial direction of the workpiece W. Slide one
7 is provided with a drive device for the wheel head main bodies 21 and 121.

Next, a driving device for the wheel heads 18 and 118 will be described. As shown in FIG. 2, guides 19 for guiding the grindstone body 21, 121 are provided below the grindstone body 21, 121.
A feed screw portion 26 parallel to 119 has a bearing 2 on the slide 17.
7 support it so as not to move in the axial direction.

The feed screw portion 26 is a screw portion 2 of the opposite hand.
8,128. A nut 29 is screwed into the screw portion 28, and a nut 129 is screwed into the screw portion 128. The nut 29 is supported by a nut case 31 fixed to the grindstone base 18 by a bearing 32 so as not to be rotatably moved in the axial direction. The second-stage worm wheel 33 is fixed to the nut 29, and the second-stage worm wheel 33 is mounted on the nut case 31.
4 and coaxial and integral with the second stage worm 34
The first-stage worm 36 meshes with the first-stage worm wheel 35. The two whetstone position adjustment shafts 37 to which the first-stage worm 36 is fixed are rotatably supported by the nut case 31 via a bearing 39 so as not to move in the axial direction, and are spline-fitted to the whetstone head position difference adjustment shaft 41. are doing. The shaft 41 is supported by the slide 17 via a bearing 41a so as not to move in the axial direction. The shaft 41 projects outward toward the operator when viewed from the operator of the slide 17, and a double-grid wheel-related position adjusting handle 42 with a micrometer collar is provided at the shaft end. Installed. Saddle 3
An automatic cutting device 43 for driving the feed screw portion 26 for each reciprocation of the feed screw portion 26 is connected to the feed screw portion 26.
Is a cutting handle 45 through a micrometer device 44.
It is connected to. The automatic cutting device 43 and the micrometer device 44 are the same as those known for a cylindrical grinding machine, and therefore, the description thereof is omitted. The fixing screw 46 for the feed screw portion 26 screwed into the slide 17 is used to fix or release the portion of the feed screw portion 26 which rotates at a speed increase relative to the feed screw portion 26 directly, and has a lever 47.

The feed screw portion 26 includes left and right screw portions 28,
128 may be provided so as to be one and set near the center of the slide position adjusting device 60.

[0020] As shown in FIG.
0 is provided on the slide 17. Double whetstone correction device 5
Reference numerals 0 and 150 face the grindstone correction tools 50a and 150a, respectively.
125, and has the same configuration. Whetstone correction tool 50
a is a single stone diamond or a rotary dresser. In this example, the case of a rotary dresser will be described for simplicity of explanation. The grindstone correction tool 50a is a grindstone correction tool base 5
0b is fixed to a rotating shaft (not shown) parallel to the grinding wheel shaft 22, and is rotationally driven by a motor built in the tool base 50b. Whetstone correction tool stand 50b
Is fixed to the slide 17 via an XY slide whose position can be adjusted in directions parallel and perpendicular to the grinding wheel shaft 22.

The slide 17 is supported by a flexible support such as a cable chain for supplying power to the grinding wheel stands 18 and 118 on the slide 17 and feeding of the grinding fluid with the movement of the slide 17. One end of a wiring member such as an electric wire or a rubber hose, and one end of a piping member 49 are connected. Feed screw part 2 described above
6, the bevel gear pair 52, 53 is used to connect the threaded portions 28, 128 because they are not coaxial as shown in FIG.
And the relay shafts 54 and 154 are connected to the connecting shaft 57 by bevel gear pairs 55 and 56 and 155 and 156 pairs,
Each shaft has a bearing 58, 59, 1 fixed to the slide 17, respectively.
58 and 159 are rotatably supported.

The slide 17 is supported on the saddle 3 via a slide position adjusting device 60. The slide position adjusting device 60 is as follows. Both whetstones 25, 125
The worm wheel 61 is rotatably supported on the saddle 3 by the bearing 62 such that the worm wheel 61 rotates about a perpendicular line passing through a point where a horizontal line passing through the center in the width direction of the workpiece W passes through the center of the workpiece W. . Worm wheel 6
1 is that the positioning shaft portion 63 is fitted to the slide 17,
Slide the bolt 64 through the worm wheel 61
7 and fixed to a slide 17. The slide 17 slides on an annular guide 66 provided coaxially with the worm wheel 61, and the slide 17 is rotatably carried. The worm 67 meshing with the worm wheel 61 is rotatably supported on the saddle 3 by a bearing 68 (FIG. 3). A lead angle adjusting handle 74 having a micrometer collar 71 is attached to a worm shaft 69 of the worm 67. The micrometer collar 71 has a tilt angle of the slide 17 in the plan view of FIG.
A horizontal line connecting the centers in the width direction of 5,125 is a center 12 attached to the spindle 8 of the work headstock and a sleeve 13 of the tailstock.
3 shows an angle formed between the center line and the center line connecting the centers 14 attached to the center.

Next, the operation of the above configuration will be described.

First, the replacement gear box 6 is operated to set the screw pitch to be cut. Next, a lead angle corresponding to the screw pitch is calculated. When the lead angle adjusting handle 74 is rotated, the worm shaft 69 is rotated, and the worm 67 is rotated. The worm 67 rotates the worm wheel 61. Since the worm wheel 61 and the slide 17 are fixed, the slide 17 tilts in a horizontal plane. When the lead angle can be obtained by the micrometer collar 71, the horizontal line connecting the centers of the grindstones 25 and 125 in the width direction is inclined at the required lead angle with respect to the axis of the workpiece W.

The cut into the workpiece W is shown in FIG.
Shown in The blank of the workpiece W is provided with a grinding allowance and the lower screw is cut, and the outer diameter D0 is usually turned and hardened. Assuming that the amount of cut in the radial direction of the grindstone 25 (the following cut is described in the radial direction of the workpiece W and is simply referred to as the amount of cut) is t1 and the amount of cut of the grindstone 125 is t2, When the saddle 3 is moved in one cut, the workpiece diameter D
1 = D0- (t1 + t2). Rotation direction is workpiece W
4 is clockwise in FIG.
Is clockwise, and the moving direction of the peripheral surface of the workpiece W and the moving direction of the peripheral surface of the grindstones 25 and 125 are opposite directions. When the anti-skid is not used, the cuts t1 and t2 are grindstones 25 and 125.
Are selected so that the main components of the grinding forces are approximately equal.

In order to initially set the above-mentioned cutting conditions for grinding, the lever 47 is turned to tighten the feed screw fixing screw 46, the feed screw portion 26 is immobilized, and the double wheel-related position adjusting handle 42 is rotated. Then, the two whetstone position adjusting shafts 37 rotate via the shaft 41 and rotate the first-stage worm 36. The first-stage worm rotates the first-stage worm wheel 35, and the coaxial second-stage worm rotates integrally.
Since the second-stage worm 34 rotates the second-stage worm wheel 33, the nut 29 rotates while being supported by the bearing 32, and the grindstone table 18 moves together with the nut case 31. Thus, the grindstone table 18 is first retracted more than the grindstone table 118.

A master of a diameter D1 having an accurate cylindrical surface formed on the outer periphery is mounted between the headstock center 12 and the tailstock center 14, and the feed screw portion 26 is made rotatable by returning the cut feed screw fixing lever 47. Then, the cutting handle 45 is rotated to bring the grindstone stands 18 and 118 closer to each other. Then, the grindstone 125 is brought into contact with the master, and the feed screw fixing lever 47 is turned again to fix the feed screw portion 26, and the two grindstone positional relationship adjusting handles 42 are rotated to thereby turn the grindstone table 18
To bring the grindstone 25 into contact with the master. Next, the handle 42 is rotated in the opposite direction with reference to the above scale, and the horizontal distance between the opposing surfaces of the grindstone 25 and the workpiece W is determined by the grindstones 25 and 12.
The grindstone head 18 is retracted so that the cutting difference of 5 becomes t2, the lever 47 for fixing the infeed feed screw is loosened, and the cutting handle 45 is turned to retract the grindstone heads 18, 118.

Next, the master is detached from the headstock center 12 and the tailstock center 14, and a screw 15 is attached to the blank of the work W, and the center 12 of the work headstock 7 and the tailstock 9 are mounted.
The workpiece W is mounted between the centers 14 of the above, and the driving tool 16 and the screw 15 are engaged. When the main motors 23 and 123 are rotated, the grindstone shafts 22 and 1 are respectively driven via belt devices 24 and 124.
22 rotates, and the grindstones 25 and 125 rotate. Workpiece W
The saddle 3 is moved so that the grindstones 25 and 125 come to positions deviated from the tailstock side end, and the cutting handle 45 is rotated to rotate the feed screw portion 26 to bring the grindstone stands 18 and 118 close to each other. When the cutting of the grindstone 25 is made to be t1, the cutting amount is set as shown in FIG. That is,
The cut of the grindstone 25 is t1, and the cut of the grindstone 125 is t2. On the other hand, the required cutting amount is set in the automatic cutting device 43 before this. Here, when the electric motor 10 is driven, the work spindle 8 rotates via the belt device 11 and the driving tool 1 is rotated.
6. The workpiece W rotates via the screw 15. At the same time, the lead screw 5 is driven, the saddle 3 is fed, and the workpiece W
Thread grinding is performed.

As shown in FIG. 4, the grinding resistance applied to the workpiece W is such that the grinding resistance of the grindstone 25 is the main component force F1 and the back component force F2, and the grinding resistance of the grindstone 125 is the main component force F101 and the back component force F102.
The main component force F1ＦF101 and the back component force F2 ≒ F102.

As described above, since the grinding resistance of the grindstones 25 and 125 can be balanced, the bending force is hardly applied to the workpiece W. Therefore, even if the workpiece W is elongated, the workpiece W can be machined without the anti-skid, and the anti-skid is used. In this case, the number is extremely small as compared with the conventional case. The anti-sway device is a V-block 72 that moves up and down from below the workpiece W as shown in FIG. 5, or a metal support 7 that moves up and down from below the workpiece W as shown in FIG.
3 may be used.

The grindstone correction is performed by the grindstone correction devices 50 and 150 by retracting the grindstone stands 18 and 118.

Next, another embodiment will be described. FIG. 7 shows a side sectional view corresponding to FIG. 3 of the previous embodiment.
FIG. 8 is a plan view of FIG. The difference from the previous embodiment is that, in this embodiment, each of the grindstone stands 18 and 118 is driven by a servomotor 75, 175 provided on the slide 17 and a screw feeder connected to the servomotor 75, 175. Thereby, the cutting difference between the grindstones 25 and 125 is set. Slide 17, saddle 3, lead angle adjusting device 6
0 is the same as in the previous embodiment. The cutting feed is performed by a numerical controller. That is, the numerical controller 76 numerically controls the servo motors 75 and 175, and each of the servo motors 75 and 175
The ball nuts 79 and 179 connected to the ball screws 78 and 178 supported by 77 and screwed into the ball screws 78 and 178 are fixed to the grindstone body 21 and 121. The origin positions of the grindstone stands 18 and 118 are determined, and a cutting command is issued by the numerical controller 76. The working positions of the grindstones 25 and 125 are corrected by the grindstone correction cutting amounts of the grindstone correcting devices 50 and 150, and the working positions of the grindstones 25 and 125 are at the same distance from the center of the workpiece W at the origin positions. .

At the beginning of the grinding process, the grindstone stands 18 and 118 are located at positions away from the tailstock side end of the work W. When the grindstones 18 and 118 start, they approach the work W and cut. At this time, the program is given a cut t1 to the grindstone 25 and a cut t2 to the grindstone 125 as shown in FIG.
The movement of the saddle 3 is started by the lead screw 5, and screw grinding is performed. The notch in the forward movement surface of the saddle 3 is set by the numerical controller 76
Is performed by driving the servo motors 75 and 175, and the finished diameter of the thread portion of the workpiece W is also determined by the numerical controller 76.

[0034]

According to a first aspect of the present invention, a machine stand, a saddle reciprocally movable on the machine stand, a saddle driving device, and a line facing the machine stand on a line parallel to the saddle moving direction. Workpiece headstock and tailstock provided with the center line of the workpiece on the saddle
The slide supported through a turning position adjustment device having a vertical axis perpendicular to the machine stand as the center of rotation, and the center line of the workpiece supported by the headstock and the tailstock are aligned with the vertical axis. Through
That both sides of the substantially workpiece in the same position as the position, and two wheel head which faces with the retractably slides toward the workpiece, grinding machine provided with a counter wheel head with a grinding wheel head driving device (1) Since the cutting depth of the grinding wheel can be increased, the grinding ability is significantly increased. (2) Even if the cutting depth of the grindstone is increased, the bending moment applied to the workpiece can be reduced by canceling the grinding resistance of the two grindstones. The number of stops can be reduced. (3) Compared with a conventional cylindrical grinder, the force applied to the workpiece in the case of the same cutting depth is small, so that the dimensional error and the shape error of the workpiece due to the deformation of the workpiece are reduced. (4) The anti-sway device has a simple structure because it only needs to support the workpiece in one direction, and the adjustment is performed quickly.

In the second aspect of the present invention, since one or connected feed screws have thread portions having different twisting directions, the two grinding wheels are equally cut by the rotation of the feed screw. There is no need to perform each operation separately, and an interlocking device for both whetstones can be easily manufactured.

According to the third aspect of the present invention, in the second aspect, since the rotational position of at least one nut can be adjusted, the difference in the relative positions of the respective grinding wheels with respect to the workpiece can be adjusted. Can be easily obtained.

According to the fourth aspect of the present invention, since each wheel head is provided with a separate driving device and driven by a servomotor controlled by a numerical controller, the cutting difference between the two wheels can be set, and the simultaneous cutting action can be performed. Can be easily performed.

According to a fifth aspect of the present invention, since both grinding wheels rotate in the same direction, the moving directions of the peripheral surfaces of both the grinding wheels are both the same direction or the opposite directions to the moving direction of the workpiece peripheral surface. Can be done.

According to the sixth aspect of the present invention, since both wheels rotate in opposite directions, the peripheral surface of one wheel moves in the same direction and the peripheral surface of the other wheel moves in the opposite direction. That is, upcut grinding and downcut grinding can be performed.

According to the seventh aspect of the present invention, since one of the two grindstones rotates forward and backward, both grindstones can rotate in the same direction and both grindstones can rotate in opposite directions. Therefore, any of the grinding methods according to the fifth and sixth aspects can be selected.

According to an eighth aspect of the present invention, when the distance between the grindstone correction tool of each grindstone correcting device and the grindstone in a cut state to the workpiece is equalized, the respective grindstone heads are retracted by the same distance.
The grinding wheel can be modified. For example, when a molded rotary diamond dresser is used, there is almost no wear of the modified tool. Therefore, the diameter of the grinding wheel is cut evenly, and the dimensional control of the grinding wheel is easy.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is an AA sectional view including a BB section in FIG. 1;

FIG. 3 is a sectional view taken along line CC of FIG. 2;

FIG. 4 is a side view perpendicular to a workpiece showing a grinding cut example.

FIG. 5 is a side view of the steady rest.

FIG. 6 is a side view of the steady rest.

FIG. 7 is a side view showing a partial cross section of another embodiment.

FIG. 8 is a plan view of FIG. 7;

[Explanation of symbols]

1, Machine stand 2, Guide 3, Saddle 4, Feed nut 5, Lead screw 6, Replacement gear box 7, Workpiece headstock 8, Workpiece spindle 9, Tailstock 10,・ Electric motor 11 ・ ・ Belt device 12 ・ ・ Center 13 ・ ・ Sleeve 14 ・ ・ Center 15 ・ ・ Spindle 16 ・ ・ Driver 17 ・ ・ Slide 18 ・ ・ Whetstone base 19 ・ ・ Guidance 21 ・ ・ Whetstone base body 22 ・・ Whetstone shaft 23 ・ ・ Main motor 24 ・ ・ Belt device 25 ・ ・ Whetstone 26 ・ ・ Feed screw 27 ・ ・ Bearing 28 ・ ・ Screw part 29 ・ ・ Nut 3
1. Nut case 32. Bearing 33. Second-stage worm wheel 34. Second-stage worm 35. First-stage worm wheel 36. First-stage worm 37.
39 ・ ・ Bearing 40 ・ ・ Shaft 41a ・ ・ Bearing 42 ・ ・
Double wheel related position adjustment handle 43 Automatic cutting device 44 Micrometer device 45 Cutting tool 46 Fixing screw 47 Lever 49 Piping member 50 Grindstone repair device 50a Grindstone repair tool 50b ..Whetstone correction tool tables 52, 53, 55, 56
..Bevel gear pair 54.Relay shaft 57.Connection shaft 58
··· Bearing 60 ··· Slide position adjusting device 61 ·· Warm wheel 62 ·· Bearing 63 ··· Positioning shaft 64 ··· Bolt 66 ·· Circular guide 67 ·· Warm 68 ·· Bearing 69 ·· Warm shaft 71 ..Micrometer color
72 ·· V block 73 ·· Receiver 74 ·· Lead angle adjustment handle 75 ·· Servo motor 76 ··· Numerical control device 77 ··· Bearing 78 ··· Ball screw 79 ···
Ball nut 80 ・ ・ Nut case 118 ・ ・ Whetstone base 119 ・ ・ Guide 121 ・ ・ Whetstone base body 122
・ ・ Whetstone shaft 123 ・ ・ Main motor 124 ・ ・ Belt device 125 ・ ・ Whetstone 128 ・ ・ Thread part 129 ・ ・ Nut 150 ・ ・ Whetstone correction device 150a ・ ・ Whetstone correction tool 150b ・ ・ Wheelstone correction tool stand 152,153
155, 156 ... bevel gear pair 154 ... relay shaft 15
8. Bearing 175 Servo motor 177 Bearing 178 Ball screw 179 Ball nut.

Claims (8)

(57) [Claims] 1. A screw grinder provided with a screw grinding feed means for making a ratio of rotation of a long workpiece and relative movement of a grinding wheel and a workpiece in an axial direction constant, a machine base and a machine base. A reciprocating saddle, a saddle driving device, a work headstock and a tailstock provided on the machine base so as to face a line parallel to the saddle moving direction, and a center line of the work on the saddle. Through
The vertical axis passes through a slide supported through a turning position adjustment device having a vertical axis perpendicular to the machine base as a turning center, and a center line of a workpiece supported by a headstock and a tailstock. Rank
Both sides of the workpiece substantially the same position and location, and two wheel head which faces with the retractably slides toward the workpiece, screw grinding machine provided with a counter wheel head having a wheel head driving device. 2. A drive device for a wheel head having a feed screw disposed in a cutting direction of the wheel head and connected by an integral or interlocking device, wherein the feed screw includes screw portions having different twist directions from each other. 2. The screw grinder according to claim 1, wherein nuts screwed into the wheel heads are attached to the respective wheel heads. 3. The opposed grinding wheel head according to claim 2, wherein at least one of the nuts mounted on each wheel head is rotated to be immovable so that the position in the rotation direction can be adjusted. Equipped with a screw grinder. 4. A driving device for a wheel head includes a servo motor provided for each wheel head, a screw feeder for connecting the servo motor and the wheel head, and a numerical controller for controlling the servo motor. A screw grinder provided with the opposed wheel head according to claim 1. 5. The screw grinding machine according to claim 1, wherein the grinding wheels rotate in the same direction. 6. The grinding wheel according to claim 1, wherein the rotating directions of the grinding wheels are opposite to each other.
A screw grinder provided with the opposed wheel head according to any one of the above. 7. The opposing device according to claim 1, wherein at least one of the main motors for driving the grindstones provided on the grindstone heads of the two grindstone heads is rotatable in normal and reverse directions. Screw grinder with a grinding wheel head. 8. A grindstone correcting device which acts on a grindstone at a retracted position of a grindstone stand, and a grindstone correcting tool is disposed at a position opposite to a position where each grindstone acts on a workpiece. A screw grinder equipped with the opposed grinding wheel head according to any one of Items 1 to 7.