JPH085006B2 - Polishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention converts the rotation of a motor into a reciprocating motion, and slides a shafted polishing tool at the tip forward and backward at high speed to polish or grind a workpiece. The present invention relates to a polishing device.

(Prior Art) Conventionally, this type of polishing device has a sliding structure that reciprocates back and forth in a substantially pistol-shaped housing in which a grip portion is projectingly provided on a lower surface of a body, in association with a motor and a rotor shaft of the motor. It comprises a rod, and further comprises a polishing tool with a shaft detachably connected to the tip of the sliding rod, and the polishing tool with a shaft is slid back and forth by the operation of the motor for polishing and grinding work. ing.

The means for connecting the above-mentioned polishing tool with a shaft is such that the tip of the sliding rod is formed into a cylindrical shape and a collet portion is formed by providing a slit on the peripheral wall thereof, and a nut body is screwed onto the peripheral wall to be attached. A shaft rod of a polishing tool with a shaft having a circular cross section is inserted into the collet portion and is tightened with a nut body.

(Problems to be Solved by the Invention) In order to improve the workability of the polishing work in the above-described conventional polishing apparatus, it is conceivable to increase the sliding width of the shafted polishing tool accompanying the rotation of the rotor shaft. However, on the other hand,
Rubbing is likely to occur in the shaft-attached polishing tool, and polishing accuracy may be reduced.

Further, when the polishing tool with a shaft is connected to the sliding rod, the polishing surface of the polishing tool with a shaft is substantially parallel to the lower surface of the body portion provided with the grip portion, that is, the polishing surface and the workpiece. It is necessary to insert the shaft rod into the collet while aligning it so that it is parallel to the surface to be polished, and it takes extra time to attach the polishing tool with a shaft, resulting in a decrease in the efficiency of polishing work. Had.

Furthermore, since the shock and vibration during the polishing work are directly transmitted to the hand of the operator through the grip portion, there is a risk of causing an industrial accident such as white wax when used continuously for a long time.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to improve the workability of polishing / grinding work without deteriorating the work accuracy, and to adjust the position of each attachment once. The purpose is to enable the polishing tool with a shaft to be connected without needing to do so and to prevent shock and vibration during the polishing work from being transmitted to the operator's hands as much as possible.

(Means for Solving the Problems) In order to achieve the above object, the polishing apparatus of the present invention comprises:
An ultra-high-speed rotation motor is built in a grip portion protruding from the lower surface of the body of the housing, a sleeve is externally fitted to the rotor shaft of the housing, and the outer peripheral surface of the sleeve is slightly eccentric with respect to the center of the rotor shaft. Includes a crankshaft that links the rear end to the outer circumference of the sleeve and reciprocates back and forth by the rotation of the sleeve,
A shaft which is slidably supported by being connected to the crankshaft, and which is provided at the tip of the shaft with a fitting portion which divides the shaft into upper and lower parts and which is provided with a tightening nut screwed onto the outer periphery thereof. , A shaft of an abrasive tool with a shaft is detachably connected to the clasp with a rectangular cross section that fits into the tip of the shaft, and a grip made of a soft resin having vibration damping property is attached to the outer periphery of the grip. It is characterized by having done. Further, for the reason described below, the shaft of the polishing tool with a shaft is formed so as to have a desired elasticity, or is locked to either one of the upper and lower surfaces of the shaft and the inner surface of the shaft tip at which the upper and lower surfaces are in sliding contact. It is more effective to provide the convex portion and the concave portion with which the convex portion engages on the other side.

(Operation) With the above-mentioned configuration, since the polishing tool with the shaft is reciprocated at the ultra-high speed by the ultra-high-speed rotation motor with a minute sliding width to perform the grinding / grinding work, the polishing accuracy is not deteriorated. Workability can be improved.

Further, since the shaft rod having a rectangular cross section is sandwiched between the upper and lower divided shaft tips to connect the shaft-attached polishing tool, if the upper and lower split surfaces of the shaft tip are preliminarily parallel to the lower surface of the body portion, the degree of connection can be improved. It is possible to position the polishing surface in parallel with the surface to be polished without having to adjust the positions one by one.

Further, the grip portion provided on the grip portion can absorb the shock and vibration during the polishing work, and reduce the shock and vibration transmitted to the hand of the worker.

In addition, by making the shaft rod of the polishing tool with a shaft elastic, the shaft rod elastically deforms during work and maintains the parallelism in contact between the surface to be polished and the surface to be polished, and Keep pressure constant.

In addition, the engagement of the locking convex portion and the concave portion can prevent lateral movement of the shaft-attached polishing tool connected to the tip of the shaft.

(Example) Hereinafter, an example of the polishing apparatus of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral A denotes a housing, and the housing A is formed into a substantially pistol shape including a hollow body portion 1 and a grip portion 2 projecting from a rear portion of a lower surface 1a of the body portion 1.

The grip portion 2 has a cylindrical shape whose lower surface is open, and communicates the inside thereof with an air inlet 3 opened at the rear end of the body portion 1. An ultra-high speed rotating air motor 4 which operates by compressed air supplied from the air inlet 3 is mounted in the grip portion 2.

Further, on the outer periphery of the grip portion 2, a grip portion 5 formed in a bottomed tubular shape using a resin material having vibration damping property, more specifically, synthetic resin such as urethane and vinyl chloride sponge, hard rubber, or the like is provided. And an exhaust hole 6 communicating with the inside of the grip portion 4 is provided in the bottom wall of the grip portion 5.

As shown in the figure, the grip portion 5 is formed in a bellows shape so that irregularities appear alternately on the outer peripheral surface thereof, thereby improving the vibration damping property thereof and preventing the impact and vibration during the work transmitted to the hand of the worker. More surely reduce.

A rotor shaft 7 of the air motor 4 projects into the body portion 1, a sleeve 8 is screwed onto the outer periphery thereof, and a rear end of the crankshaft 10 is linked to the outer periphery of the sleeve 8 via a bearing 9.

The outer peripheral surface 8a of the sleeve 8 is as shown in FIG.
It is formed so as to be slightly eccentric with respect to the center of the rotor shaft 7.

The crankshaft 10 is integrally formed with a ring portion 10a at its rear end, and the ring portion 10a is fitted to the outer circumference of the bearing 9. This allows the crankshaft 10 to reciprocate at an ultrahigh speed as the rotor shaft 7 rotates. ing.

The crankshaft 10 is formed of a synthetic resin material having a desired strength, so that the shake in the left-right direction when reciprocating back and forth is mitigated.

 A shaft 11 is connected to the tip of the crankshaft 10.

The shaft 11 is slidably inserted with the tip protruding from the body 1 in a cylindrical body 12 fitted in the body 1, and the rear end is screwed and connected to the crankshaft 10.

Further, a sticking portion 13 is provided at the tip of the shaft 11, and the polishing tool B with a shaft is connected via the sticking portion 13.

As shown in FIGS. 3 and 4, the clasping portion 13 divides the tip of the shaft 11 into upper and lower parts to form a gap 13c having a rectangular cross section between the upper piece 13a and the lower piece 13b, and at the moment 13c. Rear end 13c ′
Is expanded as shown in the figure, and as a result, the upper piece 13a and the lower piece are
Give 13b proper elasticity. Further, the outer surface tips of the upper piece 13a and the lower piece 13b are tapered surfaces 13d, and the shaft 11
A tightening nut 14 is screwed onto the outer circumference of the tip. The inner circumference of the tightening nut 14 is formed in a taper shape that abuts the tapered surface 13d, whereby the upper piece 13a and the lower piece 13b are elastically deformed in the direction of the gap 13c by tightening the tightening nut 14. The shaft rod b of the polishing tool B with a shaft fitted between the lower pieces 13b.
Holds ₁ firmly.

It should be noted that, when the shaft 11 is connected to the crankshaft 10, the clasping portion 13 has a gap 13c between the upper and lower pieces 13a and 13b, which is a lower surface 1a of the body portion 1.
It is formed so as to be parallel to.

On the inner surfaces of the upper piece 13a and the lower piece 13b, a concave portion 15 formed of a concave groove extending in the length direction of the shaft 11 is formed.

As shown in FIG. 5, the polishing tool B with a shaft comprises a shaft b ₁ made of a desired elastic material such as a synthetic resin, and a rectangular plate-shaped grindstone b ₂ provided at the tip of the shaft b _1. It has a rectangular cross section that can be fitted into the gap 13c of the attachment portion 13. Further, the tip end b ₁ ′ of the shaft b ₁ is gradually tapered and is formed in a sectional shape,
The whetstone b ₂ is fitted in a groove b ₃ provided on the upper surface of the whetstone b ₂ so that the whetstone b ₂ is detachably attached to the tip of the shaft rod b ₁ .

Further, on the upper and lower surfaces of the shaft rod b ₁ , there are provided locking projections b ₄ which engage with the recesses 15 provided on the upper and lower pieces 13a, 13b, and by the engagement of the locking projections b ₄ with the recesses 15. The lateral movement of the polishing tool B with a shaft is prevented. Grinding the engaging convexed latch portion b ₄ is over its entire length for the upper surface of the shaft rod b ₁ to shaft rod b ₁ is substantially uniformly elastically deformable over its entire length, the lower surface of the shaft rod b ₁ rear
It is formed up to the rear end of b ₂ .

According to the above-described polishing tool B with a shaft, the shaft b ₁ is attached to the gap between the clasps 13.
If it is fitted into 13c, the lower surface of the grindstone b ₂ , that is, the polished surface b ₅ is aligned in parallel with the lower surface 1a of the body portion 1. Therefore, when performing the polishing / grinding work by gripping the grip portion 2, the polished surface b ₅ Are positioned substantially parallel to the surface to be polished of the workpiece. Also, by forming the shaft rod b ₁ of an elastic material, always maintain a constant parallelism during working the shaft rod b ₁ is in contact with the polishing surface b ₅ and the surface to be polished is elastically deformed, and Keep the contact pressure constant. Therefore, it becomes possible to obtain higher polishing and grinding accuracy.

FIG. 6 shows an example in which a sanding tool B ₆ is attached to the tip of a shaft rod b ₁ to form a polishing tool B with a shaft.

The shaft rod b ₁ has a belt-like tip, and a fitting recess b ₇ that is tapered toward the rear end is provided in the shaft b _1, and a locking recess b ₇ ′ is provided in the middle of the fitting recess b _7. To provide. Also axis rod
The above-mentioned locking protrusion b ₄ is formed on the upper and lower surfaces of b ₁ over its entire length.

The file b ₂ has a rear end side formed into a tapered shape which can be fitted into the fitting recess b ₇ , and a protrusion b ₈ which is engageably and disengageably engaged with the locking recess b ₇ ′ is provided in the middle thereof. It is detachably attached to the shaft rod b ₁ . Then, a plurality of various shapes such as a flat plate shape as shown in FIG. 6, a substantially triangular columnar shape as shown in FIG. 7 and a curved shape as shown in FIG. 8 are prepared and arbitrarily exchanged. Mount it on shaft rod b ₄ .

The polishing tool B with a shaft shown in FIG. 5 or FIG. 6 to FIG. 8 is selectively used according to the shape and material of the surface to be polished or the finishing accuracy in the stepwise polishing process. It is a thing.

Further, in the above description, the air motor 4 is provided in the grip portion 2, but the present invention is not limited to this, and it is also possible to use an electric motor of ultra-high speed rotation.

(Effects of the Invention) Since the polishing apparatus of the present invention is configured as described above, it has the effects described below.

According to the polishing apparatus of claim 1, by reciprocating the polishing tool with a shaft at a very high speed, it is possible to improve the polishing workability while maintaining high polishing accuracy, and only insert the shaft rod into the sandwiched portion. Since the position of the polishing tool with a shaft can be adjusted, the work can be performed more efficiently, and the shock and vibration transmitted to the hand of the worker can be reduced to prevent white wax.

Further, according to the polishing apparatus of claim 2, in addition to the effect of claim 1, the parallelism and contact pressure of the contact between the surface to be polished and the surface to be polished during work are kept constant, High polishing accuracy can be obtained.

According to the polishing apparatus of the third aspect, in addition to the effect of the first aspect described above, it is possible to prevent lateral deviation of the polishing tool with a shaft and obtain higher polishing accuracy.

[Brief description of drawings]

The drawing shows an embodiment of the polishing apparatus of the present invention, FIG. 1 is a longitudinal front view, and FIG. 2 is an enlarged sectional view taken along line (2)-(2) of FIG.
FIG. 3 is an enlarged cross-sectional view taken along line (3)-(3) of FIG. 1, FIG. 4 is an enlarged perspective view of a clasped portion, and FIGS. 5 and 6 are enlarged perspective views of a polishing tool with a shaft. 7 and 8 are enlarged perspective views of the file. In the figure, A: housing, 1: body part 2: grip part, 4: air motor 7: rotor shaft, 8: sleeve 10: crankshaft, 11: shaft 14: tightening nut, 13: clasp part B : Polishing tool with shaft, b ₁ : Shaft bar 5: Grip part, b ₄ : Locking convex part 15: Recessed part

Claims (3)

[Claims] 1. An ultra-high-speed rotation motor is built in a grip portion projecting from the lower surface of a body of a housing, a sleeve is externally fitted to the rotor shaft of the motor, and the outer peripheral surface of the sleeve is slightly eccentric with respect to the center of the rotor shaft. On the other hand, in the other body, a crankshaft which has a rear end linked to the outer circumference of the sleeve and reciprocates back and forth by rotation of the sleeve, and a shaft which is slidably supported by being connected to the crankshaft are provided. The tip is provided with a holding portion that divides the shaft into upper and lower parts and is provided with a tightening nut that is screwed onto the outer periphery of the shaft, and the holding portion is formed as a rectangular cross section into which the shaft rod of the polishing tool with a shaft is inserted into the tip of the shaft. And a grip part made of a soft resin having vibration damping property is attached to the outer periphery of the grip part. 2. The polishing apparatus according to claim 1, wherein the shaft rod of the polishing tool with a shaft has a desired elasticity. 3. A recess for engaging a locking projection on one of the upper and lower surfaces of a shaft of the polishing tool with a shaft and an inner surface of a shaft tip with which the upper and lower surfaces are in sliding contact, and a recess for engaging the projection on the other. The polishing apparatus according to claim 1, further comprising: