JP2004255512A - Inner surface grinding device with dresser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grindstone forming device wherein three points of front and back surfaces and a straight part of an emery wheel axially supported on a grindstone shaft of a cylindrical grinding device are dressed and formed. <P>SOLUTION: A grindstone forming mechanism 8 is provided with a bracket having a grindstone forming frame on a front surface and movable in the longitudinal direction on a side surface of an arm 81 free to revolve in the longitudinal direction around a shaft of a grindstone forming mechanism supporting base. It is furnished with a fixed supporting block 86 supporting a pair of a fixed single stone diamond blade 85 and a movable fixed single stone diamond blade 84 each by separating them toward inside on the left and the right of a grindstone forming frame front surface and a movable block 87 free to slide in the left and right directions. A pair of the single stone diamond blades 84, 85 of the grindstone forming mechanism 8 is free to move to the front and back surfaces of the emery wheel 12 by revolution of an arm 31. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an internal grinding device having a grinding wheel forming mechanism capable of dressing the front and rear surfaces and the outer peripheral surface of a grinding wheel of the internal grinding device.
[0002]
[Prior art]
A wheel spindle for holding a work at the tip, a grinding wheel rotatably mounted at the tip of a wheel axis movably mounted in the left-right direction (Z-axis direction) and the front-back direction; 2. Description of the Related Art An internal grinding apparatus having a grinding wheel forming mechanism provided on a rear surface side is known, and a straight traverse shown in FIG. 5 is performed by moving a grinding wheel relative to a work held on a work spindle. Both ends cut, straight traverse intermittent cut, straight oscillating continuous cut, straight plunge forming, left plunge forming, right plunge forming, contouring grinding, simultaneous biaxial taper grinding, etc. (For example, see Non-Patent Document 1.)
[0003]
Regarding the movement of the grinding wheel of the internal grinding device in the front-rear direction and the left-right direction, as in the internal grinding device described in Document 1, a left-right moving table is placed on the bed, and the front-rear moving table (grinding table) is placed thereon. ), And if an internal grinding device with a grinding wheel fixed to a rotating grindstone shaft is also commercially available on the table, the table can be placed on the bed and the table can be moved left and right. There has also been proposed an inner surface grinding apparatus in which a (grinding wheel base) is mounted and a grinding wheel is fixed to a rotating grindstone shaft on a table moving left and right (for example, see Patent Document 1).
[0004]
When grinding the inner surface of the work, it is necessary to dress the worn grinding wheel, and Non-Patent Document 1 discloses a single-stone diamond blade for an outer peripheral dress provided on the rear side of the work spindle as shown in FIG. Disclose to use. Similarly, Patent Document 1 proposes using a single stone diamond blade provided on the rear surface side of the work spindle. Further, it has been proposed to use a pair of rotary dressers and form the dress by sandwiching the outer peripheral surface of an inner grinding wheel between the rotary grinding wheels of the rotary dresser (for example, see Patent Document 2). .). Further, a rotary dresser having a U-shaped groove resembling the outer shape of a grinding wheel is fixed to the side of the work headstock, and the grinding wheel is moved back and forth and left and right to abut the rotary dresser, and the grinding wheel is rotated. An inner surface grinding device for dress forming the front and rear surfaces and the straight surface has also been proposed (for example, see Patent Document 3).
[0005]
[Non-patent document 1]
(Pamphlet of CNC precision internal grinding machine IGM15NC (trade name) issued by Okamoto Machine Tool Works, April 10, 2001, page 3)
[Patent Document 1]
JP-A-2000-218527 (see page 3 and FIG. 1)
[Patent Document 2]
JP 2001-162530 A (see page 1 and FIG. 1)
[Patent Document 3]
JP-A-6-23666 (see page 1 and FIG. 1)
[0006]
[Problems to be solved by the invention]
A grinding wheel forming mechanism for forming a grinding wheel with one single stone diamond blade disclosed in Non-patent Document 1 and Patent Document 1 and a grinding wheel with a pair of rotary dressers disclosed in Patent Document 2. The grinding wheel forming mechanism is good for forming the outer peripheral surface of the straight line parallel to the main axis of the grinding wheel, but cannot form the front and rear surfaces of the grinding wheel. In the left plunge forming, the front of the grinding wheel is severely worn, and when grinding grooves on the inner surface of the work, straight plunge grinding, left plunge grinding, and right plunge grinding are performed. It is necessary to dress the surface and the outer peripheral surface of the straight. The rotary dresser having a U-groove disclosed in Patent Document 3 does not consider the wear of the front and rear surfaces of the grinding wheel, and cannot be dressed on the front and rear surfaces of the grinding wheel after a certain period of operation. Therefore, a program for changing the position coordinates of the grinding wheel suitable for dress molding is required.
The present invention provides a grinding wheel forming mechanism capable of forming not only a dress on the outer peripheral surface of a straight wheel of a grinding wheel, but also the front and rear surfaces of the grinding wheel.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, a work spindle for holding a work at a tip, and a tip of a grindstone shaft movably mounted in the left-right direction (Z-axis direction) and the front-rear direction are rotatably supported. An inner surface grinding device comprising a grinding wheel and a grinding wheel forming mechanism provided on a rear surface side of the work spindle.
The whetstone forming mechanism includes an arm capable of turning back and forth around an axis of a whetstone forming mechanism support base, a bracket movable forward and backward on a side surface of the arm, and a whetstone forming frame provided on a front surface of the bracket. And a fixed support block which supports a pair of single-stone diamond blades at the left and right sides of the front face of the whetstone forming frame while being spaced inward and a movable block slidable in the left-right direction. And a pair of single stone diamond blades of the grinding wheel forming mechanism which can be moved to the front and rear surfaces of a grinding wheel supported by a grinding wheel shaft by turning an arm. Things.
[0008]
Dress forming the front side of the grinding wheel with the left single stone diamond blade of the grinding wheel forming mechanism, dress forming the rear side of the grinding wheel with the right left single stone diamond blade, and / or one of the left single stone diamond blade and / or the right left single stone diamond blade Both can dress the outer peripheral surface of the grinding wheel. At the time of grinding the work, the grinding wheel is turned by an arm so as not to interfere (collide) with the grinding wheel and the grinding wheel forming mechanism is evacuated to a standby position.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
【Example】
Hereinafter, the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a perspective view of an internal grinding device, FIG. 2 is a plan view of a grindstone forming mechanism of the present invention, and FIG. 3 is a front view of the grindstone forming mechanism of the present invention.
[0010]
In the internal grinding apparatus shown in FIG. 1, 1 is a bed, 2 is a headstock, 3 is a work spindle, 4 is a guide surface in the left-right direction (Z-axis direction), and 5 is a left-right movement teable that can move in the left-right direction. Table 6 is a guide surface provided on the left and right moving table 5 so as to protrude upward and extends in the X axis (front and rear direction) perpendicular to the Z axis. Reference numeral 7 is a front and rear direction (X axis direction) along the guide surface 6. , A grinding wheel forming mechanism, 9 a three-jaw scroll chuck, 10 a grinding wheel head, 11 a grinding wheel shaft, 12 a grinding wheel, and 13 and 14 motors.
[0011]
The work is held by a three-jaw scroll chuck 3 of the headstock 2 and is rotated by the rotation of the work spindle 3. The front and rear movement of the grinding wheel 12 is achieved by moving the grinding wheel base 7 back and forth on the guide surface 6 by means of a servomotor. This is performed by moving the left / right moving table 5 on which the surface 6 is placed on the guide surface 4 in the left / right direction. By moving the grinding wheel 12 in the left-right direction and the front-back direction, the grinding wheel 12 can be moved closer to or away from the work or the grinding wheel forming mechanism. The inner surface grinding apparatus shown in FIG. 1 places a table for moving left and right on a bed, a table for moving back and forth (grinding table) on the table, and places a grinding wheel on a rotating wheel shaft on the table for moving back and forth. As shown in FIG. 1 of Patent Literature 1, a fixed table is mounted on a bed, and a table for moving back and forth is placed on the bed, and a table for moving left and right (grinding table) is placed on the table. -An internal grinding device in which a grinding wheel is fixed to a rotating wheel shaft on a bull may be used. The chuck 3 also depends on the work, but may be a four-jaw independent chuck.
[0012]
As shown in FIGS. 2 and 3, the grindstone forming mechanism 8 is provided with an arm 81 capable of turning back and forth around an axis 81a of a grindstone forming mechanism support base 80 and moving in the front and rear direction along the side surface of the arm. A bracket 82 that can be formed, a grindstone forming frame 83 provided on the front surface of the bracket, and a pair of saw-toothed single-stone diamond blades 84 and 85 on the left and right sides of the front surface of the whetstone forming frame, respectively. 2 and a movable block 87 slidable in the left-right direction. In FIG. 2, the fixed support block 86 on the right side is fixed to the grindstone forming frame 83 by bolts 88. The left movable support block 87 is fixed by bolts 89 across a slide groove 90 provided on the rear surface of the grindstone forming frame 83.
[0013]
To move the movable support block 87 to the left, turn the holding screw 91 counterclockwise to loosen it, move it with the bolt 89 to the left, and turn the holding screw 91 clockwise again to tighten it. In this case, the distance between the cutting edges 84a and 85a of the pair of left and right single stone diamond blades 84 and 85 increases (see FIG. 3). Conversely, the distance between the cutting edges 84a, 85a of the pair of single-stone diamond blades 84, 85 can be reduced by moving the movable support block 87 clockwise, so that the cap screw 91 is turned clockwise. Turn to loosen, hold bolt 89, move to the right, and turn cap screw 91 clockwise again to tighten (see FIG. 2).
[0014]
The cutting edges 84a, 85a of the pair of left and right single stone diamond blades 84, 85 are fixed to the upper surfaces of the movable support block 87 and the fixed support block 86, respectively, so that the axes 84b, 85b form an acute angle. On the upper surfaces of the movable support block 87 and the fixed support block 86, there are provided adjusting grooves 87a, 86a which can move the single stone diamond blades 84, 85 along the axes 84b, 85b by 5 to 15 mm, respectively. 84 and 85 are fixed by pressing the tips of the bolts 89 and 88 and the tips of the holding bolts 92 and 93 against the depressions 84c and 84d and 85c and 85d provided on the side surfaces thereof. Therefore, either one of the pair of left and right single stone diamond blades 84 and 85 can be located forward of the other, or can be located on the same line. In FIG. 2, the single stone diamond blade 84 on the movable support block 87 is located further forward, and the front surface 12a and the straight portion 12c of the grinding wheel 12 can be dressed. Of course, if the distance between the single stone diamond cutting edges 84a and 85a is sufficient, the straight portion 12c of the grinding wheel 12 can be dress-formed with the alternate cutting edges 85a. FIG. 2 shows a state in which the single stone diamond blade 85 on the fixed support block 86 is dressing the rear surface 12 b of the grinding wheel 12.
[0015]
Three scales 1, 2, and 3 are engraved on the upper surface of a bracket 82 that can move in the front-rear direction, which is in contact with the side surface of the arm 81, and serves as a guide for the front-rear movement of the grinding wheel forming frame 83 with one scale of 15 mm. The position of the grindstone forming frame 83 can be finely adjusted by matching the alignment mark 81b provided at the front part of the upper surface 81 with one of the three scales (the second scale matches the mark 81b in FIG. 2). .
[0016]
The pair of single stone diamond blades 84 and 85 of the grinding wheel forming mechanism 8 are driven in front of and behind the grinding wheel 12 supported by the grinding wheel shaft by the rotation of the motor 14 and the rotation of the arm 81 around the shaft 81a. Moved to a plane.
The dressing is performed by rotating and moving the grinding wheel 12 by bringing the grinding wheel 12 into contact with desired single-stone diamond blades 84 and 85 by moving the grinding wheel 12 in the left-right direction and the front-back direction. The higher the rotation speed of the grinding wheel 12 and the slower the movement of the grinding wheel, the greater the degree of the dress. Therefore, rough dress forming and fine dress forming can be performed by selecting the rotation speed and the moving speed of the grinding wheel.
[0017]
The dressing of the grinding wheel of the inner surface grinding device has been described above. However, it goes without saying that the grinding wheel forming mechanism 8 can be used for dressing of a grinding wheel of a known surface grinding device or cylindrical grinding device.
[0018]
【The invention's effect】
The grinding wheel forming mechanism of the cylindrical grinding apparatus according to the present invention can dress the front and rear surfaces and the straight portion of the grinding wheel, and prevents the grinding wheel forming mechanism from colliding with the grinding wheel when grinding the inner surface of the work. The arm can be turned to evacuate to the waiting place.
[Brief description of the drawings]
FIG. 1 is a perspective view of an internal grinding device.
FIG. 2 is a plan view of the grinding wheel forming mechanism of the present invention.
FIG. 3 is a front view of the grinding wheel forming mechanism of the present invention.
FIG. 4 is a diagram showing a positional relationship among a grinding wheel, a work spindle and a single-stone diamond dresser in the internal grinding device. (Known)
FIG. 5 is an explanatory view showing a work grinding method in the inner surface grinding device. (Known)
[Explanation of symbols]
1 Bed 2 Headstock 3 Work spindle 4 Z-axis direction guide surface 5 Left / right moving table 6 X-axis direction guide surface 7 Grindstone 8 Grindstone forming mechanism 10 Grindstone head 11 Grindstone shaft 12 Grindstone wheel 81 Arm 83 Grindstone Molded frame 84 single stone diamond blade (movable side)
85 single stone diamond blade (fixed side)

Claims (1)

A wheel spindle for holding a work at the tip, a grinding wheel rotatably mounted at the tip of a wheel axis movably mounted in the left-right direction (Z-axis direction) and the front-back direction; An internal grinding device including a grinding wheel forming mechanism provided on a rear surface side,
The whetstone forming mechanism includes an arm capable of turning back and forth around an axis of a whetstone forming mechanism support base, a bracket movable forward and backward on a side surface of the arm, and a whetstone forming frame provided on a front surface of the bracket. And a fixed support block which supports a pair of single-stone diamond blades at the left and right sides of the front face of the whetstone forming frame while being spaced inward and a movable block slidable in the left-right direction. An inner surface grinding apparatus characterized in that a pair of single stone diamond blades of the grinding wheel forming mechanism can be moved to the front and rear surfaces of a grinding wheel supported by a grinding wheel shaft by turning an arm.

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