JP4604082B2 - Thread grinding machine - Google Patents

Description

  The present invention relates to a screw grinder provided with a dresser mechanism for dressing the working surfaces (both side surfaces of the tip) on both sides of the tip of a rotating grindstone for thread grinding.

  The screw grinder includes a grinding object support device that supports a grinding object so as to be rotationally driven, and a disk-shaped grindstone (rotating grindstone) that grinds the grinding object.

  For example, a ground material support device is provided with a slide base slidably on a bed, a headstock having a spindle driven to rotate by the slide base and a tailstock are provided in an opposing state, and the spindle and tailstock of the spindle base are provided. The grinding object is supported rotatably at the center of the table, and is ground by a rotating grindstone while rotating and driving the grinding object in the main axis direction.

  In addition, this grindstone is provided so as to be able to slide toward and away from the workpiece W in a direction orthogonal to the main axis direction, and is configured to be capable of adjusting the tilt according to the lead angle.

  For example, the grinding object is thread-ground at the tip (circumferential edge) of a disk-shaped grindstone that is rotationally driven. The grindstone rotation mechanism that rotationally drives the grindstone, the grindstone movement control mechanism that slides the grindstone in and out, and the lead A grindstone grinding mechanism is provided that includes a grindstone lead angle adjustment mechanism that adjusts the tilting of the grindstone according to the angle.

  Such a screw grinding machine is provided with a dresser mechanism for dressing a grindstone, but it is necessary to dress both sides of the tip like a sword instead of dressing one side of the grindstone.

  However, when dressing both sides of the tip, if there is a variation in the accuracy of the cutting position, cutting amount or stroke amount, the tip shape of the grindstone will vary, resulting in variations in the thread shape accuracy and effective diameter. Will occur.

  That is, when NC controlling the dresser that dresses both sides of the front end of the grindstone, since highly accurate movement control is required, a very expensive NC control device is required. It was difficult to dress accurately.

  On the other hand, there is also a dressing method using a rotary dress that transfers the dresser shape to the grindstone by pressing the grindstone against the V-shaped dresser. On the other hand, various kinds of rotary dresses (dressers) must be prepared, and the dressers must be replaced each time, and high-precision dressing cannot be expected.

  The present invention solves such problems, and even with a simple movement control mechanism, since both sides of the front end of the grindstone can always be dressed under the same conditions, dressing with high accuracy is always possible. Different types of dressing stones can be easily handled without changing the dresser sequentially. Specifically, the grindstone can be dressed with a grindstone, and both sides of the tip of the grindstone are simply reversed by 180 degrees. The same movement control without changing the sequential movement control setting for each side, that is, this setting condition at the reversal position without changing the setting of the dresser position, cutting depth and stroke amount with respect to the preset grindstone after reversing By simply running, both sides can be dressed quickly and accurately, and the grindstone is tilted according to the lead angle. And its object is to provide a very innovative thread grinder to leave the tip sides of the state can be accurately dressed with a simple structure as described above.

  The gist of the present invention will be described with reference to the accompanying drawings.

  According to the lead angle of the screw to be ground, a disc-like grindstone 1 is rotatably provided on a grinding object support device 10 that supports the grinding object W so as to be rotatable. The grindstone 1 is provided so as to be tiltable with respect to the grinding object W, and a screw having a predetermined lead angle is ground on the grinding object W by the rotating grindstone 1, and a dresser for dressing the grindstone 1. A screw grinder provided with a dresser mechanism 6 including a grindstone 3, a dresser rotation mechanism 4 that rotationally drives the dresser grindstone 3, and a dresser movement control mechanism 5 that controls movement of the dresser grindstone 3 relative to the grindstone 1. When the grindstone 1 is tilted and adjusted with respect to the grinding object W in accordance with the lead angle of the screw, the dresser mechanism 6 is provided on the tilting base 7 that tilts together with the grindstone 1. A dresser mechanism mounting base 8 provided with the dresser grindstone 3, the dresser rotating mechanism 4, and the dresser movement control mechanism 5 of the dressing mechanism 6 is rotated 180 degrees with respect to the tilting base 7 to position the dresser grindstone 3. Is provided on the tilt base 7 so that one end of the tip of the grindstone 1 tilted with the predetermined lead angle is inclined to the dresser rotating mechanism 4 and the After the dresser grindstone 3 is rotated by the dresser movement control mechanism 5 and cut by a predetermined amount and dressed by a predetermined stroke, the dresser mechanism mounting base 8 is rotated 180 degrees with respect to the tilting base 7 by the reversing mechanism 9. By moving, the rotary drive is performed without changing the cut amount and the stroke amount with respect to the grindstone 1 while maintaining the lead angle. The screw grinding machine is characterized in that the position of the lessa grindstone 3 is inverted and switched 180 degrees with respect to the grindstone 1 so that the opposite side of the tip of the grindstone 1 is dressed in the same manner.

  Further, a slide base 12 is provided on the bed 11 so as to be slidable in the main shaft direction, and a main head base 14 having a main shaft 13 and a tailstock 15 are arranged opposite to the slide base 12, and the main head base 14 and the tailstock 15 The grinding object support device 10 is configured so that the grinding object W can be rotatably driven and supported by the slide of the slide base 12 so as to be movable in the main axis direction, and is supported by the grinding object support device 10. Further, the grindstone 1 for grinding a screw on the grinded object W, a grindstone rotating mechanism 16 that rotationally drives the grindstone 1, a grindstone movement control mechanism 17 that causes the grindstone 1 to contact and separate from the grinded object W, and the grindstone 1 2. The screw grinding machine according to claim 1, further comprising a grindstone grinding mechanism 19 including a grindstone lead angle adjusting mechanism 18 that tilts and adjusts the angle according to the lead angle.

  The dresser grindstone 3 employs a cup-shaped grindstone and cuts the cup surface of the dresser grindstone 3 by a predetermined amount at a predetermined tilt angle with respect to both side surfaces of the tip of the grindstone 1 to make a stroke by a predetermined amount. The screw grinding machine according to any one of claims 1 and 2, wherein the tip is dressed like a sword.

  Since the present invention is configured as described above, the grindstone can be dressed with a grindstone, and the both sides of the front end of the grindstone are simply reversed by 180 degrees without changing the sequential movement control setting for each side. Movement control, that is, the dresser position, cutting depth, and stroke amount with respect to the preset grinding wheel after reversing are set without changing the setting of the dresser, and the both sides can be quickly and accurately dressed simply by executing the setting conditions at the reversing position. In addition, it is an extremely revolutionary screw grinder capable of accurately dressing both side surfaces of the tip with a simple configuration as described above while the grindstone is inclined according to the lead angle.

  Further, in the inventions of claims 2 and 3, the present invention can be easily realized with a simpler configuration, and an epoch-making screw grinder excellent in practicality can be obtained.

  Embodiments of the present invention that are considered suitable (how to carry out the invention) will be briefly described with reference to the drawings, illustrating the operation of the present invention.

  The grindstone 1 is tilt-adjusted by controlling the tilt while detecting the tilt amount by the encoder 21 or the like according to the lead angle of the screw.

  That is, the grindstone 1 is moved by the operation of the grindstone lead angle adjusting mechanism 18 of the grindstone grinding mechanism 19 provided with the grindstone rotating mechanism 16 for rotationally driving the grindstone 1 and the grindstone movement control mechanism 17 for moving the grindstone 1 to and away from the workpiece W. Adjust the tilt.

  In other words, for example, the grindstone grinding mechanism 19 is operated while detecting the tilt angle (tilt amount) by the encoder 21 provided on the tilt shaft 20, and the tilt adjustment of the grindstone 1 is set to a desired lead angle. For example, the grinding wheel mounting base 22 provided with the grinding wheel 1, the grinding wheel rotating mechanism 16, and the grinding wheel movement control mechanism 17 is rotated by the tilting drive source of the grinding wheel grinding mechanism 19, and the grinding wheel provided on the grinding wheel grinding mechanism mounting base 22 is provided. Set 1 for tilt adjustment.

  At this time, according to the present invention, the dresser mechanism 6 tilts together with the grindstone 1 (grindstone grinding mechanism mounting base 22). That is, the dresser mechanism 6 is provided on the tilt base 7 that tilts together with the grindstone 1.

  Therefore, for example, when the grindstone grinding mechanism mounting base 22 is tilted according to the lead angle to tilt the grindstone 1, the tilting base 7 is also tilted, and the dresser mechanism 6 is tilted together with the grindstone 1.

  Therefore, it is not necessary to reset every time the lead angle is changed, and even if the lead angle is adjusted, the relative position of the dresser grindstone 3 of the dresser mechanism 6 with respect to the grindstone 1 does not change.

  In addition to the grindstone 1 of the dresser mechanism 6 together with the grindstone 1, the dresser rotation mechanism 4 that rotationally drives the grindstone 1 also advances and retracts the dresser grindstone 3 to cut and retreat or to cut the dresser along the dressing surface. The movement control mechanism 5 also tilts, and the preset cutting position (distance and angle with respect to the grindstone 1), the cutting amount, and the stroke amount do not change without changing this setting.

  In the present invention, even if the lead angle is changed as described above, the grindstone 1 can always be dressed with the dresser grindstone 3 under the same condition while being tilted. In addition, in the present invention, the dressing on one side of the tip of the grindstone 1 is completed. Thereafter, simply by operating the reversing mechanism 9, the dresser mechanism mounting base 8 rotates 180 degrees with respect to the tilting base 7 and the position of the dresser grindstone 3 is reversed with respect to the grindstone 1.

  Since the dresser grindstone 3 and the dresser rotation mechanism 4 and the dresser movement control mechanism 5 are attached to the dresser mechanism mounting base body 8 and the dresser grindstone 3 and the dresser rotation mechanism 4 and the dresser movement control mechanism 5 are also reversed. Change the opposite side as well as the one side just by performing dressing at the inverted position without changing the cutting position (distance and angle with respect to the grinding wheel 1), cutting amount and cutting stroke amount of the dresser grinding wheel 3 It is possible to dress under the same conditions without doing.

  Therefore, it is not necessary to change the adjustment in the dresser mechanism 6 even when the lead angle is changed. Even if the dressing on both sides of the tip of the grindstone 1 is a simple movement control mechanism as in this embodiment, By inverting this with the dresser grindstone 3 and operating as it is, the same symmetrical dressing can be achieved, and a highly precise dressing is always possible by simple movement control with a simple configuration, and the shape of the grindstone 1 can be changed. It will be an epoch-making thread grinder that can easily handle this.

  Specific embodiments of the present invention will be described with reference to the drawings.

  In the present embodiment, a disk-shaped grindstone 1 is provided on a grinding object support device 10 that supports a grinding object W so as to be rotationally driven, and can be driven to rotate away from the grinding object W so as to be rotatable. The grindstone 1 is provided so as to be tiltably adjustable with respect to the grinding object W in accordance with the lead angle, and a screw having a predetermined lead angle is ground on the grinding object W by the rotating grindstone 1.

  Specifically, in this embodiment, a slide base 12 is provided on a bed 11 so as to be slidable in the main axis direction. A main base 14 having a main shaft 13 and a tailstock 15 are arranged on the slide base 12 so as to face each other. The grinding object support device 10 is configured so that the grinding object W can be rotatably driven by the main shaft 13 of the base 14 and the center of the tailstock 15 and can be supported by the slide of the slide base 12 so as to be movable in the main axis direction. It is composed.

  Further, the grindstone 1 that grinds the screw to the ground material W supported by the ground material support device 10, the grindstone rotating mechanism 16 that rotationally drives the grindstone 1, and the grindstone 1 that contacts and separates from the ground material W. A grindstone grinding mechanism 19 including a grindstone movement control mechanism 17 for sliding and a grindstone lead angle adjusting mechanism 18 for adjusting the tilt of the grindstone 1 according to the lead angle is provided.

  Accordingly, the grindstone W is ground by the rotating grindstone 1 while being fed and slid in the main axis direction while being rotated, and the grindstone 1 is tilted by the lead angle by the encoder 21 according to the desired lead angle by the grindstone lead angle adjusting mechanism 18. The grindstone 1 that has been adjusted and tilted is brought into contact with the grinding object W by the grindstone movement control mechanism 17 to grind the cutting screw.

  In the present embodiment, a grinding wheel grinding mechanism mounting base 22 provided with the grinding wheel grinding mechanism 19 is provided so as to be tiltable with respect to the horizontal with the tilting shaft 20 as an axis, and the disc-shaped grinding wheel 1 is tiltable with respect to the vertical. is doing.

  The grindstone lead angle adjusting mechanism 18 of the grindstone grinding mechanism 19 presses one side of the tilt shaft 20 upward by a biasing device 23 (for example, a cylinder device as shown) and biases the opposite side downward, The working part 24 of the grinding wheel grinding mechanism mounting base 22 biased by the bearing is supported by a nut part 25, a tilting ball screw 26 to which the nut part 25 is screwed is installed obliquely, and the tilting ball screw 26 is rotated for tilting. By controlling the rotation by the drive source 27, the nut portion 25 is controlled to move in the oblique direction.

  That is, the nut portion 25 with a supporting roller that supports the action portion 24 (supporting surface) of the grinding wheel grinding mechanism mounting base 22 moves up and down as the tilting ball screw 26 moves in the oblique direction, thereby lowering The action part 24 (whetstone grinding mechanism mounting base 22) biased to the tilt is controlled to tilt.

  In addition, the present embodiment is provided with a dresser mechanism 6 for dressing the grindstone 1 on such a screw grinder. The dresser mechanism 6 dresses the tip angle side surface of the disc-shaped grindstone 1 and dresses like a sword. To do.

  The dresser mechanism 6 includes a dresser grindstone 3 that dresses the grindstone 1, a dresser rotation mechanism 4 that rotationally drives the dresser grindstone 3, and a dresser movement control mechanism 5 that controls the movement of the dresser grindstone 3 with respect to the grindstone 1. The dresser grindstone 3 is composed of a dresser angle fine adjustment mechanism that finely adjusts the angle. In this embodiment, the dresser grindstone 3 is a cup-shaped grindstone, and has a predetermined shape with respect to both side surfaces of the tip of the grindstone 1. The tip of the grindstone 1 is dressed like a sword by cutting a predetermined amount of the cup surface of the dresser grindstone 3 at a tilt angle and making a predetermined amount of stroke.

  Further, when the grindstone 1 is tilt-adjusted and set with respect to the grinding object W corresponding to the lead angle of the screw, the dresser mechanism 6 is provided on the tilting base 7 that tilts together with the grindstone 1. A dresser mechanism mounting base 8 provided with a dresser grindstone 3, the dresser rotating mechanism 4, and the dresser movement control mechanism 5 is rotated 180 degrees with respect to the tilting base 7 to position the dresser grindstone 3 on the grindstone 1. In contrast, the tilting base body 7 is provided with a reversing mechanism 9 for reversing and switching 180 degrees.

  That is, the tilting base 7 is erected on the grindstone grinding mechanism mounting base 22, and the dresser mechanism 6 is provided on the tilting base 7. Accordingly, the operation of the grinding wheel lead angle adjusting mechanism 18 causes the grinding wheel grinding mechanism mounting base 22 and the tilting base 7 to tilt according to the lead angle, so that the grinding stone 1 and the dresser grinding stone 3 are tilted together. The tilting base body 7 is not directly provided with the dresser mechanism 6, but the tilting base body 7 is provided with a dresser mechanism mounting base 8 that can be rotated 180 degrees, and the dresser mechanism mounting base 8 is provided with the dresser mechanism 6.

  Specifically, an inversion drive source 28 is provided on the tilt base 7, and an inversion drive shaft 29 that reciprocates 180 degrees is provided by the inversion drive source 28, and the dresser mechanism is attached to the inversion drive shaft 29. A base 8 is provided, a dresser mechanism 6 is provided on the dresser mechanism mounting base 8, a positioning recess is provided at each dressing position that is controlled to be reversed 180 degrees, and a positioning pin that engages and protrudes and engages by rotating is engaged. A reversing positioning locking mechanism 30 is provided that is detachable.

  Therefore, the dresser rotating mechanism 4 and the dresser movement control mechanism 5 rotate the dresser grindstone 3 by a predetermined amount and cut a predetermined amount on one side surface of the grindstone 1 while the predetermined lead angle is inclined. After the dressing, the dresser mechanism mounting base 8 is rotated 180 degrees with respect to the tilting base 7 by the reversing mechanism 9 so that the dresser grinding stone 3 with respect to the grinding stone 1 with the lead angle maintained. The position of the rotationally driven dresser grindstone 3 is reversed 180 degrees with respect to the grindstone 1 without changing the position (distance and angle with respect to the grindstone 1), the cut amount and the stroke amount, and the tip of the grindstone 1 is switched. The other side is configured to be dressed in the same manner.

  Therefore, again, in this embodiment, even if the lead angle is changed in this way, the grindstone 1 can always be dressed by the dresser grindstone 3 in the same tilted state, and in this embodiment, the dresser mechanism 6 Is not provided directly on the tilting base body 7, and the dresser mechanism mounting base body 8 is provided on the tilting base body 7, and the dresser mechanism mounting base body 8 is provided with the dresser mechanism 6. Therefore, after the dressing on one side of the tip of the grindstone 1 is completed, By simply operating the reversing mechanism 9, the dresser mechanism mounting base 8 rotates 180 degrees with respect to the tilting base 7, and the position of the dresser grindstone 3 is reversed with respect to the grindstone 1. The dresser grindstone 3, the dresser rotation mechanism 4, the dresser movement control mechanism 5, and the dresser angle fine adjustment mechanism are attached, and together with the dresser grindstone 3, the dresser Since the rolling mechanism 4, the dresser movement control mechanism 5, and the dresser angle fine adjustment mechanism are also reversed, the cutting position (distance and angle with respect to the grinding wheel 1), the cutting amount, and the cutting stroke amount of the dresser grinding wheel 3 set in advance are not changed. The dressing can be performed under the same conditions without changing and setting the opposite side surface as well as the one side surface only by performing the dressing at the inverted position.

  Further, in the present embodiment, the dresser mechanism mounting base 8 includes the dresser grindstone 3, the dresser rotation mechanism 4 that rotationally drives the dresser grindstone 3, and the dresser movement control mechanism 5 that controls the movement. Yes.

  The dresser rotation mechanism 4 includes a rotation drive source and a transmission mechanism such as a belt. The dresser movement control mechanism 5 includes a rotation drive source, a ball screw that rotates by the rotation drive source, and a moving base that moves along the guide by the ball screw. A moving mechanism is provided in the X and Y directions, the contact / retraction control with respect to the grindstone 1 and the cutting amount at the time of contact are controlled by the X direction moving mechanism, and the dressing stroke after cutting is controlled by the Y direction moving mechanism. This unit is configured so that the inclination of the dresser grindstone 3 relative to the grindstone 1 can be finely adjusted with respect to the dresser mechanism mounting base 8 by a dresser angle fine adjustment mechanism.

  This adjustment is performed by screwing in a dresser grindstone tilt adjustment screw, but the illustration is omitted.

  Therefore, a stepping motor that rotates the ball screw to preset the angle of the dresser grindstone 3 with respect to the grindstone 1 by fine adjustment of the tilt and to set the cutting amount by the approach stroke from the position of the dresser grindstone 3 to the grindstone 1 at this angle. If the rotation amount of the stepping motor that rotates the ball screw is set in the same way as the stroke amount in the direction orthogonal to this, and if these are set in advance in this way, this setting is not changed. The opposite side surface of the grindstone 1 can be dressed under the same conditions simply by controlling the dresser mechanism mounting base 8 to rotate 180 degrees.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

It is a description front view of a present Example. It is a description top view of a present Example. It is a description side view of the grindstone lead angle adjustment mechanism of a present Example. It is a description sectional side view of a present Example. It is an explanatory top view of the inversion mechanism of the dresser mechanism of the present embodiment. It is a description perspective view of the dresser mechanism in the state which is dressing the tip one side of the grindstone of this example. It is an explanatory perspective view of the dresser mechanism in a state where it is reversed by the reversing mechanism of the present embodiment and the side surface opposite to the tip of the grindstone is dressed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grindstone 3 Dresser grindstone 4 Dresser rotation mechanism 5 Dresser movement control mechanism 6 Dresser mechanism 7 Tilt base 8 Dresser mechanism mounting base 9 Reverse mechanism
10 Ground support equipment
11 bets
12 Slide base
13 Spindle
14 Headstock
15 Tailstock
16 Wheel rotation mechanism
17 Wheel movement control mechanism
18 Grinding wheel lead angle adjustment mechanism
19 Grinding wheel grinding mechanism

Claims (3)

  A disc-shaped grindstone is provided on a grind support device for rotatably driving a grinded object so as to be capable of rotating and driving with respect to the grinded material, and the grindstone is arranged according to the lead angle of a screw to be ground. It is provided so that it can be tilted and adjusted with respect to the grinding object, and a screw having a predetermined lead angle is ground on the grinding object by the rotating grindstone, and a dresser grindstone for dressing the grindstone and the dresser grindstone are driven to rotate. A thread grinder comprising a dresser rotation mechanism and a dresser movement control mechanism for controlling the movement of the dresser grindstone with respect to the grindstone. When the tilt adjustment of the grindstone is set, the dresser mechanism is provided on a tilt base that tilts together with the grindstone, and the dresser grindstone and the dresser rotation of the dresser mechanism are provided. A reversing mechanism that rotates a dresser mechanism mounting base provided with a mechanism and a dresser movement control mechanism 180 degrees with respect to the tilting base and reverses the position of the dresser grindstone 180 degrees with respect to the grindstone. The dresser rotating mechanism and the dresser movement control mechanism are used to rotate the dresser grindstone by a predetermined amount to cut and stroke a predetermined amount on one side surface of the grindstone with the predetermined lead angle inclined. After dressing, the inversion amount and the stroke amount are changed with respect to the grindstone while maintaining the lead angle by rotating the dresser mechanism mounting base by 180 degrees with respect to the tilting base by the reversing mechanism. The position of the rotationally driven dresser grindstone is reversed 180 degrees with respect to the grindstone, and the opposite of the tip of the grindstone Screw grinding machine, characterized in that the surface is also configured to dressing as well.   A slide base is slidable in the main axis direction on the bed, and a headstock having a main shaft and a tailstock are arranged opposite to each other on the slide base, and the grinding object can be driven to rotate by the mainstock and tailstock. The grinding object support device is configured so as to be supported by the slide of the slide base so as to be movable in the main axis direction, and the grindstone for grinding a screw on the grinding object supported by the grinding object support device, A grindstone grinding mechanism comprising a grindstone rotating mechanism that rotationally drives the grindstone, a grindstone movement control mechanism that slides the grindstone toward and away from the grinding object, and a grindstone lead angle adjustment mechanism that tilts and adjusts the grindstone according to the lead angle. The screw grinding machine according to claim 1, wherein:   The dresser grindstone employs a cup-shaped grindstone, and the tip of the grindstone is dressed in a sword shape by cutting a predetermined amount of the cup surface of the dresser grindstone at a predetermined tilt angle with respect to both side surfaces of the front end of the grindstone, and making a predetermined amount of stroke. The screw grinding machine according to any one of claims 1 and 2, wherein the screw grinding machine is configured as described above.

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