JPH0911124A - Grinder - Google Patents

Abstract

PURPOSE: To hold movement accuracy even in high speed reverse movement of a slider which suppresses couple generated in high speed driving and holds a rotatable grinding wheel. CONSTITUTION: A crankshaft 43 is rotated by driving of a drive motor 49 so as to slide a sliding board 33 as its center and a slider 11 and a counterweight 29 are relatively reciprocated so that a work is processed by a rotatable grinding wheel 19. The reciprocation of the slider 11 causes relative reciprocation of the counterweight 29 so that dynamic balance can be held in high speed driving. The distance between the slider 11 and the counterweight 29 can be reduced and low vibration movement is possible by suppressing couple. Because the sliding radius ratio R1 /R2 is decided by the weight ratio m1 /m2 , a grinder 1 can be miniaturized and lightened so that the floor space occupied thereby can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinder, and more particularly to a grinder having an improved reciprocating slider reversing mechanism which holds a rotatable grindstone.

[0002]

2. Description of the Related Art Conventionally, a grinder that grinds a work by vertically reciprocating a tool table (lifting table) holding a rotatable grindstone is often equipped with a counterweight to improve vertical motion accuracy. Has been done.

For example, as shown in FIG. 3, an elevating table 105 holding a rotatable grindstone 103 is provided on a grindstone base unit 101 so as to be vertically reciprocally movable. A nut member 107 is integrally provided on the lift table 105, and a ball screw 109 extending in the vertical direction is screwed into the nut member 107. A pulley 111 is attached to, for example, the upper portion of the ball screw 109.

On the other hand, the grindstone base unit 101 is provided with a drive motor 113, and the drive motor 113 is provided.
A drive pulley 115 is attached to the output shaft of the. The drive pulley 115 and the pulley 111 have a belt 11
7 are wound.

With the above structure, when the drive motor 113 is driven, the drive pulley 115 is rotated via the output shaft, so that the ball screw 109 is rotated via the belt 117 and the pulley 111. Furthermore, this ball screw 109
By the rotation of the above, the lifting table 105 is vertically reciprocated via the nut member 107. The work is ground by the grindstone 103 which is freely rotatable by the vertical reciprocating movement of the lift table 105.

Pulleys 119, 121, 123 and 125 are provided around the upper and lower sides and the left and right sides of the grindstone base unit 101, and a counterweight 127 which is vertically reciprocally movable is provided on the left side of the grindstone base unit 101. Has been. Belt 12 wound around pulleys 119 and 121
One end of the belt 9 is attached to the upper end of the lifting table 105, and the other end of the belt 129 is attached to the upper end of the counterweight 127. On the other hand, one end of the belt 131 wound around the pulleys 123 and 25 is attached to the lower end of the lift table 105, and the other end of the belt 131 is attached to the lower end of the counterweight 127.

With the above-described structure, the counterweight 127 also reciprocates up and down in synchronism with the vertical reciprocating motion of the lift 105 to balance the lift 105.

[0008]

By the way, in the above-mentioned conventional counter balance mechanism, the counterweight 127 functions well at a relatively low speed movement, but in the high speed range, the relative movement of the lift 105 and the counterweight 127. As a result, a “couple” is generated, which becomes a new source of vibration, which is a factor that deteriorates motion accuracy.

It is an object of the present invention to provide a grinder capable of maintaining a motion accuracy even during a high speed reversing motion of a slider holding a rotatable grindstone by pressing a couple force generated at a high speed. .

[0010]

In order to achieve the above object, a grinding machine of the present invention according to claim 1 is provided with a slider holding a rotatable grindstone on a frame so that the slider can reciprocate and swings on the frame. A free swinging plate is provided, the slider is provided at one end of the swinging plate, and a counterweight is provided at the other end of the swinging plate. The counterweight is provided reciprocally on the frame to swing the swinging plate. It is characterized in that the slider and the counterweight are relatively reciprocated by the movement.

According to a second aspect of the present invention, there is provided a grinding machine according to the first aspect, wherein a crankshaft driven by a drive motor is provided, the rotary motion of the crankshaft is converted into a swing motion, and the swing motion is performed. It is characterized in that the plate is driven.

A grinding machine according to a third aspect of the present invention is the grinding machine according to the first or second aspect, wherein the oscillating plate is mounted on an oscillating shaft provided on the frame, and the oscillating shaft to the slider are provided. swing radius ratio R ₁ / R ₂ of the swing radius R ₂ between the swing radius R ₁ and the pivot shaft to the counterweight which is supported by the swinging plate, the weight of the weight m ₁ and counterweight of the slider it is characterized in that which is determined by the weight ratio m ₁ / m ₂ and m _2.

[0013]

In the grinding machine of the present invention according to claims 1, 2 and 3, the crankshaft is rotated by the drive of the drive motor.
The rotation of the crank shaft causes the rocking plate to rock around the rocking shaft. By the swing of the swing plate, the slider provided at one end of the swing plate and the counterweight provided at the other end of the swing plate relatively reciprocate. By the reciprocating movement of the slider, the rotatable grindstone reciprocates to grind the work.

As the slider reciprocates, the counterweight relatively reciprocates, so that the dynamic balance can be maintained during high-speed operation. Further, since the distance between the slider and the counterweight can be reduced, it is possible to suppress the generation of couples, and it is possible to perform low vibration motion.

Further, a swing radius R ₁ from the swing shaft to the slider and a swing radius R ₂ from the swing shaft to the counterweight are provided.
Since the swinging radius ratio R ₁ / R ₂ of the grinding machine is determined by the weight ratio m ₁ / m ₂ of the slider weight m ₁ and the counter waist weight m ₂ , the grinding machine can be made smaller, lighter, and more compact. Floor space is planned.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIGS. 1 and 2, the grinder 1 is a fixed rectangular frame 3 having an opening at the right center in FIG. 2 and fixed frames 5A and 5B facing each other in the frame 3. Is equipped with. FIG. 2 of the frame 3
In the upper and lower parts of the right side, guide rails 7 extending in the vertical direction in FIG. 1 are laid, and each guide rail 7 is provided with a slider 11 via a linear guide 9.

A grindstone head 13 is integrally provided on the slider 11, and a rotatable spindle 15 is provided on the front part (lower part in FIG. 2) of the grindstone head 13. The chuck 1 is attached to the front end of the spindle 15.
A grindstone 19 is detachably attached at 7. At the rear part (upper part in FIG. 2) of the grindstone head 13, a rotation drive motor 21 is provided for rotating the spindle 15.

With the above structure, the slider 11 is reciprocated (moves up and down in FIG. 1) along the guide rail 7 via the linear guide 9 by the reciprocating mechanism which will be described in detail later. The reciprocating movement of the slider 11 causes the grindstone head 13 to reciprocate. Further, by driving the rotation drive motor 21, the spindle 15 is rotated, so that the grindstone 19 is rotated. Therefore, when the grindstone 19 is rotated and reciprocated, the work (not shown) is ground.

As the reciprocating mechanism 23 for reciprocating the slider 11, the front and rear portions of the frames 5A and 5B (upper and lower portions in FIG. 2) are well shown in FIG.
Includes a guide rail 2 extending vertically in FIG.
5 is laid, and a rectangular counterweight 29 having a central opening on the right side in FIG. 2 is provided on each of the guide rails 25 via a linear guide 27 so as to reciprocate (vertically move in FIG. 1). .

A swing plate 33 is swingably mounted via a swing shaft 31 near the slider 11 side between the frames 5A and 5B. A pin 35 provided at one end (right end in FIGS. 1 and 2) of the swing plate 33 engages with a U-shaped engaging portion 11A formed on the left side in FIGS. 1 and 2 of the slider 11. Has been done. A pin 37 provided on the other end (left end in FIGS. 1 and 2) of the rocking plate 33 engages with a U-shaped engaging portion 29A formed on the left part of the counterweight 29 in FIGS. Have been combined.

One end of an arm member 41 is provided by a pin 39 above the swing shaft 31 of the swing plate 33. The other end of the arm member 41 is provided on the crank shaft 43, and the crank shaft 43 is integrated with the pulley 45.

A drive motor 49 is provided on the left side of the frame 3 in FIG. 1 via a motor base 47. A drive pulley 51 is attached to the output shaft of the drive motor 49. The drive pulley 51 and the pulley 45
A belt 53 is wound around and.

With the above structure, when the drive motor 49 is driven, the drive pulley 51 is rotated via the output shaft,
Further, the crankshaft 43 is connected via the belt 53 and the pulley 45.
Is rotated. The rotation of the crank shaft 43 causes the swing plate 33 to swing about the swing shaft 31 via the arm member 41. The swing of the swing plate 33 causes the slider 11 to move.
And the counterweight 29 are relatively reciprocated. Therefore, as the slider 11 reciprocates, the rotating grindstone 19 reciprocates as described above, and the work is ground.

As the slider 11 reciprocates, the counterweight 29 relatively reciprocates, so that the dynamic balance can be maintained during high-speed operation. Further, since the distance between the slider 11 and the counter balance 29 can be reduced, it is possible to suppress the generation of couples,
Low vibration movements can be enabled. Therefore, it is possible to improve machining efficiency and realize high-precision machining by the low-vibration high-speed motion.

Further, the swing radius from the swing shaft 31 to the rear part of the slider 11 (at the pin 35) is R ₁ , and the swing radius from the swing shaft 31 to the left part of the counterweight 29 (at the pin 37). When the radius is R ₂ , the weight of the slider 11 is m ₁ , and the weight of the counterweight is m ₂ , the swinging radius (R ₁ /
R ₂ ) is determined by the weight ratio (m ₁ / m ₂ ). That is, since R ₁ · m ₁ = R ₂ · m ₂ , R ₂ = n · R
_{If it is 1} , then m ₂ = 1 / n · m ₁ . Therefore,
If n = 2, then m ₂ = 1/2 · m ₁ , and the weight of the counterweight 29 can be half that of the slider 11. Thus, it is possible to reduce the size and weight of the grinder 1 and save floor space.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in other modes by making appropriate changes. Weight of slider 11 m
_Although it is not necessary to make the weight m ₂ of ₁ and the counterweight 29 the same, the counterbalance function can be achieved even with the same weight. In that case, the swing radii R ₁ and R ₂ are the same.

Even if the weight is m ₂ > m ₁ , the counter balance function can be achieved by reversing the condition (R ₂ > R ₁ ) shown in FIG. 2 and setting R ₂ <R _1. it can. Although the reciprocating motion of the slider 11 has been described as a vertical motion,
It can also be performed in a horizontal movement.

[0029]

As will be understood from the above description of the embodiments, according to the present invention according to claims 1, 2 and 3,
The crank shaft is rotated by driving the drive motor. The rotation of the crank shaft causes the rocking plate to rock around the rocking shaft. By the swing of the swing plate, the slider provided at one end of the swing plate and the counterweight provided at the other end of the swing plate relatively reciprocate. By the reciprocating movement of the slider, the rotatable grindstone reciprocates, and the work can be ground.

As the slider reciprocates, the counterweight relatively reciprocates, so that the dynamic balance can be maintained during high-speed operation. In addition, since the distance between the slider and the counter can be reduced, the generation of couples can be suppressed, and low vibration motion can be performed. Therefore, it is possible to improve the machining efficiency and realize high-precision machining by the low-vibration high-speed motion.

Further, the vibration radius R ₁ from the vibration shaft to the slider and the vibration radius R ₂ from the swing shaft to the counterweight.
And the vibration radius ratio R ₁ / R ₂ is determined by the weight ratio m ₁ / m ₂ between the slider weight m ₁ and the counterweight m ₂ ; Can save space.

[Brief description of the drawings]

FIG. 1 is a front view of a grinding machine according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view showing an example of a conventional grinding machine.

[Explanation of symbols]

 1 Grinding Machine 3, 5A, 5B Frame 11 Slider 13 Grindstone Head 19 Grindstone 29 Counterweight 31 Swing Shaft 33 Swing Plate 41 Arm Member 43 Crankshaft 49 Drive Motor

Claims (3)

[Claims] 1. A slider holding a rotatable grindstone is reciprocally provided on a frame, and an oscillating plate is provided on the frame. The slider is provided at one end of the oscillating plate and is oscillated. A counterweight is provided at the other end of the plate, the counterweight is reciprocally provided on the frame, and the slider and the counterweight are relatively reciprocated by the rocking of the rocking plate. Board. 2. A grinding machine according to claim 1, wherein a crank shaft driven by a drive motor is provided, the rotary motion of the crank shaft is converted into a swing motion, and the swing plate is driven. Board. 3. A counterweight in which the swing plate is mounted on a swing shaft provided on the frame, and a swing radius R ₁ from the swing shaft to the slider and a swing weight supported by the swing plate from the swing shaft. The swing radius ratio R ₁ / R ₂ to the swing radius R ₂ is determined by the weight ratio m ₁ / m ₂ between the weight m _{1 of the} slider and the weight m _{2 of the} counterweight. The grinding machine according to claim 1 or 2.