JPH0212701B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a grindstone dresser used for shaping the peripheral edge of a grindstone into an acute angle.

BACKGROUND ART Conventionally, when forming grooves on plastics or the like, a disc-shaped grindstone 1 whose peripheral edge is formed at an acute angle, as shown in FIG. 5, has been used. The formation of the inclined surface 2 on the grindstone 1 is generally carried out by alternately repeating vertical feeding of the grindstone 1 attached to a machine tool and horizontal feeding of a grindstone dresser.

Further, as shown in FIG. 5, the machine tool has a base block 3 whose inclination angle with respect to the table surface of the machine tool can be adjusted to an arbitrary angle, and a slide block 4 attached to the base block 3 so as to be slidable in the vertical direction. In some cases, a grindstone dresser 6 having a diamond tool 5 attached to a slide block 4 is used. According to this grindstone dresser 6, the inclined surface 2 can be formed by sliding the slide block 3 in the vertical direction while rotating the grindstone 1.

Problems to be Solved by the Invention When forming the grindstone 1 using the grindstone dresser 6 or other types of grindstone dressers, in either case, after forming the inclined surface 2 in one direction, the grindstone 1 is not attached to the machine tool. The other inclined surface 2 is formed by reversing the grinding wheel or changing the mounting position of the grindstone dresser. For this reason, it takes time and effort to form the grindstone 1.

Incidentally, if two grindstone dressers 6 are prepared, these grindstone dressers 6 are attached to both sides of the grindstone 1, and the slide blocks 4 are slid at the same time, the time required to form the inclined surface 2 can be halved. but,
When the slide blocks 4 are slid downward, the slide blocks 4 or the diamond tools 5 collide with each other, making it impossible to form the peripheral edge of the grindstone 1 into an acute angle.

Means for solving the problem: A pair of movable blocks are provided on the base block, which can be slid toward and away from each other, and can be fixed at any position. A pair of rotating bodies is rotatably attached to a movable block around the axis of a support shaft, and these rotating bodies are integrally and rotatably connected by a connecting body. Diamond tools protruding toward the other rotating body are attached to opposing surfaces of the rotating bodies, and the diamond tool attached to one rotating body and the diamond tool attached to the other rotating body are opposed to each other with a predetermined angle shift.

Operation: Adjust the inclination angle of the rotating body to match the inclination angle of the side surface of the grindstone to be shaped, and then move the movable block to bring the tip of the diamond tool into contact with both sides of the grindstone. By rotating the grinding wheel and rotating the rotating body in this state, the tip of the diamond tool rotates with respect to the vertical plane while drawing a locus circle with an inclination according to the inclination angle of the rotating body, and both sides of the grinding wheel rotate. Smoothly formed with a predetermined inclination angle. By moving the movable blocks within a predetermined close range, the trajectory circle drawn by the diamond tool tip of one rotating body and the trajectory circle drawn by the diamond tool tip of the other rotating body are aligned around the outer periphery of the grinding wheel. The edges intersect at the edges, and the peripheral edge of the grindstone is shaped at an acute angle. Note that even if the locus circles drawn by the diamond tool tips intersect, interference with each other is prevented because the diamond tools face each other with a predetermined angle shifted from each other.

Embodiment An embodiment of the present invention will be described based on FIGS. 1 to 4. First, a base block 7 is provided, which is placed on the table surface of the machine tool.
A highly precisely finished sliding groove 8 is formed on the upper surface of the base block 7 along the vertical direction. A pair of movable blocks 11 and 12 consisting of a sliding part 9 and a rotating part 10 are slidably attached to this sliding groove 8. Here, a groove having a substantially semicircular cross section is formed in the upper end surface of the sliding portion 9, and a cylindrical support shaft 13 is fixed to this groove. on the other hand,
A groove having a substantially semicircular cross-section that slides into contact with the upper half of the support shaft 13 is formed on the lower end surface of the rotating portion 10 . Further, substantially L-shaped support members 14 are fixed to both sides of the rotating portion 10, and this support member 1
The end of the support shaft 13 is rotatably inserted into the support hole 15 formed in the support hole 15, so that the rotating portion 10 is rotatably inserted into the sliding portion around the axis of the support shaft 13. 9. Note that the rotating portion 10 is attached to one support member 14 fixed to one side of the rotating portion 10.
A fixing part (not shown) is provided for fixing the support member 14 at an arbitrary position rotated around the axis of the support shaft 13, and the other support member 14 fixed to the other side of the rotating part 10 An adjustment shaft 16 for adjusting the inclination angle of the rotating portion 10 is provided at the tip of the extending portion extending in a substantially horizontal direction.
is fixed. Note that a straight line that serves as both a tangent to the support shaft 13 and a tangent to the adjustment shaft 16 is perpendicular to the center line of the rotating portion 10 passing through the center of the support shaft 13. A pair of presser covers 17 are fastened to the upper surface of the base block 7 with screws 18 to prevent the movable blocks 11 and 12 from slipping out of the sliding grooves 8. Further, side plates 19 are fixed to both ends of the base block 7 in the longitudinal direction.

A screw hole 20 is formed in each of the sliding parts 9, and a right-hand thread cut on a threaded rod 21 is screwed into the screw hole 20 of one sliding part 9, and a right-hand thread cut on a threaded rod 21 is screwed into the screw hole 20 of one sliding part 9. A left-handed thread cut into a threaded rod 21 is screwed into the threaded hole 20. One end of the threaded rod 21 passes through one of the side plates 19, and the end of the threaded rod 21 protrudes outward from the side plate 19.
1 is fixed.
A scale 23 is engraved on the outer peripheral surface of the knob 22 to indicate the amount of sliding of the movable blocks 11 and 12 as the knob 22 is rotated.

Next, a support shaft 24 having an axis aligned with the sliding direction of the movable blocks 11 and 12 is supported by the rotating part 10 so as to be rotatable about the axis and passing through the rotating part 10. A disk-shaped rotating body 25 is integrally formed at each of the mutually opposing ends of these support shafts 24. Fitting holes 26 are formed in the rotation centers of these rotating bodies 25, and in these fitting holes 26, universal joints 2, which are connecting bodies that connect the pair of rotating bodies 25 integrally and rotatably, are formed.
The end of 7 is removably fitted. In addition,
A spring 28 is inserted into the bottom of the fitting hole 26 and urges the universal joint 27 to an intermediate position between the pair of rotating bodies 25. Note that the support shaft 24
A retaining body 29 is provided at the other end to prevent the support shaft 24 from falling off from the rotating portion 10.
is fixed, and a handle 30 for rotating the rotating body 25 is connected to one of the retaining bodies 29.

An inclined hole 31 is formed at a position separated by a predetermined distance from the center of rotation of the rotating body 25 on the opposing surfaces of the rotating body 25, and a diamond tool 32 is inserted into this inclined hole 31, and a tap screw 3 is inserted into each of the inclined holes 31.
3 prevents it from coming off. Note that the diamond tool 32 of one rotating body 25 and the other rotating body 2
The diamond tool 32 is arranged opposite to the diamond tool 32 at a predetermined angle. A spring 34 is provided at the bottom of the inclined hole 31 to bias the diamond tool 32 in the direction of removal from the inclined hole 31.
is installed.

In such a configuration, first, when the side surface of the grindstone is an inclined surface inclined at an angle θ with respect to the vertical plane, the rotating portion 10 is adjusted according to the inclination angle θ of the side surface of the grindstone.
is rotated around the axis of the support shaft 13 to adjust the inclination angle of the rotating portion 10. To adjust the inclination angle of the rotating part 10, as shown in FIG. This is done by rotating the adjusting shaft 16 around the axis and bringing the adjusting shaft 16 into contact with the upper surface of the block gauge 36.

To explain this adjustment specifically, the spindle 1
3 and the adjustment shaft 16 are horizontal, the rotating part 10 is tilted at an angle θ with respect to the perpendicular line around the axis of the support shaft 13, and the block gauge is placed on the mounting part 35. The outer peripheral surface of the adjustment shaft 16 is brought into contact with the upper surface of the adjustment shaft 36. At this time, point A on the support shaft 13 and point B of contact with the block gauge 36 on the adjustment shaft 16
The distance L is maintained equal to the distance between the axial center of the support shaft 13 and the axial center of the adjustment shaft 16. If the intersection of the perpendicular line drawn from point B and line a is C, then triangle ABC
In this case, AB=L and BC=l (l is the value obtained by subtracting the distance between the mounting portion 35 and line a from the height dimension of the block gauge 36). And ∠BAC=θ
From the relationship sin θ=l/L, the angle θ is determined by selecting the height dimension of the block gauge 36 to be used.

Similar adjustments are made in both rotating parts 10, and the inclination angles of both rotating parts 10 with respect to the vertical plane are both set to θ. As a result, the rotating parts 10 face each other in an inverted V-shape, and by tightening and fixing the fixing parts, the rotating parts 10 are fixed at the set inclination angle θ. Next, the diamond tool 32 is attached to the inclined hole 31 of the rotating body 25, and both rotating bodies 25 are connected by the universal joint 27 so as to rotate integrally. Note that, at this time, the rotating bodies 25 are connected to each other at positions where the tips of the diamond tools 32 do not face each other.

Next, a grindstone with both left and right sides parallel to each other, which is attached to the machine tool, is positioned at an intermediate position between the left and right rotating bodies 25, and the handle 30 is turned to rotate the rotating body 25, and the knob 22 is turned to rotate the movable block 1.
1 and 12 in a direction toward each other. As the handle 30 is rotated, the tip of the diamond tool 32 rotates while drawing a trajectory circle inclined at an angle θ with respect to the vertical plane. The grinding area increases as the wheels move closer to each other. Then, by rotating the tip of the diamond tool 32 while drawing a locus circle inclined at an angle θ with respect to the vertical plane, both side surfaces of the grindstone are formed into inclined surfaces inclined at an angle θ with respect to the vertical plane.

As the movable blocks 11 and 12 are brought closer together, the area of the flat part of the outer periphery of the grinding wheel becomes narrower, and eventually the trajectory circle drawn by the tip of the diamond tool 32 attached to one rotating body 25 and the circle attached to the other rotating body 25 become smaller. The locus circle drawn by the tip of the diamond tool 32 intersects at the outer periphery of the grindstone, and the periphery of the grindstone is formed at an acute angle. Note that when the locus circles drawn by the tips of the diamond tools 32 intersect with each other, since the diamond tools 32 face each other at a predetermined angle, they are prevented from interfering with each other. In this way, a grindstone with an acute peripheral edge can be formed easily and in a short time. Moreover, since the processing is performed by rotating the diamond tool 32 within a plane, a smooth finished state is obtained without creating a step on both sides of the grindstone. In addition, since the handle 30 can be rotated at a position away from the grindstone,
There is no risk of an accident where your hand hits the rotating grindstone.

Note that by appropriately setting the inclination angle of the rotating portion 10, the inclination angle of the side surface of the grindstone can be freely set.

Effects of the Invention Since the present invention is configured as described above, both sides of the grindstone can be formed into inclined surfaces at the same time by integrally rotating the pair of rotating bodies to which the diamond tool is attached. Even if the locus circles drawn by the tips of opposing diamond tools intersect, interference between the diamond tools can be prevented, and therefore a grindstone with an acute edge can be formed easily and in a short time. It has the following effects:

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of the present invention, with Figure 1 being a front view, Figure 2 being a side view, and Figure 3 being a side view.
The figure is a front view showing a working state in which the rotating part is tilted at a predetermined angle θ, Fig. 4 is an explanatory diagram showing a state in which the inclination angle of the rotating part is adjusted using a block gauge, and Fig. 5 is an explanation showing a conventional example. It is a diagram. 7... Base block, 11, 12... Movable block, 24... Support shaft, 25... Rotating body, 27... Universal joint (connection body), 32... Diamond tool.

Claims (1)

[Claims] 1 A pair of movable blocks are provided on the base block that can be slid toward and away from each other and can be fixed at any position, and support a pair of rotating bodies that are tilted in an inverted V-shape and face each other and whose inclination angle is adjustable. A diamond is attached to the movable block so as to be rotatable around the axis of the rotating body, and these rotating bodies are integrally and rotatably connected by a connecting body, and a diamond protruding toward the other rotating body is provided on mutually opposing surfaces of the rotating body. A grindstone dresser characterized in that a diamond tool mounted on one rotating body and a diamond tool mounted on the other rotating body are opposed to each other with a predetermined angle shifted from each other.