JPH04201067A - Polishing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention converts the rotation of a motor into reciprocating motion, and slides a polishing tool with a shaft at the tip back and forth at high speed to polish and grind a workpiece. Regarding polishing equipment.

(Prior Art) Conventionally, this type of polishing device has a motor and a sliding shaft that reciprocates back and forth in conjunction with the rotor shaft of the motor, which is housed in a generally pistol-shaped housing with a grip protruding from the lower surface of the body. Equipped with a rod,
Furthermore, a shafted polishing tool is removably connected to the tip of the sliding rod, and the shafted polishing tool is slid back and forth by the operation of the motor to perform polishing and grinding operations.

The above-mentioned means for connecting the shafted abrasive tools is such that the tip of the sliding rod is made into a cylindrical shape, and the peripheral wall thereof is provided with a slit to form a collet portion, and a nut body is screwed into the peripheral wall for fastening. A shaft rod of a shaft-equipped polishing tool having a circular cross section is inserted into the collet part and tightened with a nut body.

(Problems to be Solved by the Invention) When trying to improve the workability of polishing work in the conventional polishing apparatus described above, it is conceivable to increase the sliding width of the shaft-equipped polishing tool as the rotor shaft rotates. However, on the other hand, there is a possibility that the shafted polishing tool becomes loose and the polishing accuracy decreases.

In addition, when connecting the shafted polishing tool to the sliding rod, the polishing surface of the shafted polishing tool should be approximately parallel to the lower surface of the trunk provided with the gripping part, that is, the polishing surface and the workpiece should be parallel to each other. It is necessary to insert the shaft into the collet part after aligning it so that it is parallel to the surface to be polished, which requires extra effort to attach the shaft-equipped polishing tool, resulting in problems that reduce the efficiency of polishing work. had.

Furthermore, shocks and vibrations during polishing work are directly transmitted to the operator's hands through the grip, so if used continuously for a long time, there is a risk of occupational accidents such as white wax disease.

The present invention has been made in view of the above-mentioned conventional circumstances, and its purpose is to improve the workability of polishing and grinding work without deteriorating the work accuracy, and to align the position every time it is installed. To enable a polishing tool with a shaft to be connected without having to do so, and to prevent shocks and vibrations during 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 device of the present invention incorporates an ultra-high-speed rotating motor in a grip protruding from the lower surface of the body of the housing, and has a sleeve attached to the rotor shaft. is fitted onto the outside, and the outer circumferential surface of the sleeve is slightly eccentric with respect to the center of the rotor shaft, and inside the body is a crankshaft whose rear end is connected to the outer circumference of the sleeve and reciprocates back and forth as the sleeve rotates; a shaft connected to and slidably supported by a shaft, and a clamping part is provided at the tip of the shaft that divides the shaft into upper and lower parts and is equipped with a tightening nut that is screwed onto the outer periphery of the shaft. A shaft rod of the polishing tool is removably connected to the clamping part as a rectangular cross section that fits into the tip of the shaft,
Furthermore, a grip part made of a soft resin having anti-vibration properties is attached to the outer periphery of the grip part. In addition, for reasons to be described later, the shaft of the shaft-equipped polishing tool may be formed to have a desired elasticity, or it may be fixed to either the upper or lower surface of the shaft or the inner surface of the tip of the shaft where the upper and lower surfaces come into contact. If the remaining convex part is provided with a concave part in which the convex part engages,
more effective.

(Function) According to the above configuration, the shaft-mounted polishing tool is reciprocated at ultra high speed with a minute sliding width by the ultra high speed rotating motor to perform polishing and polishing.
Since grinding work is performed, workability can be improved without worrying about deterioration of polishing accuracy.

In addition, since the abrasive tool with a shaft is connected by sandwiching a shaft rod with a rectangular cross section between the top and bottom ends of the shaft, if the top and bottom split surfaces of the top and bottom ends of the shaft are positioned parallel to the bottom surface of the body in advance,
The polishing surface can be positioned parallel to the surface to be polished without the need for alignment each time the connection is made.

Furthermore, the grip portion provided on the grip portion absorbs shocks and vibrations during polishing work, and can reduce these shocks and vibrations transmitted to the operator's hands.

In addition, by providing elasticity to the shaft rod of the shafted polishing tool,
During operation, this shaft is elastically deformed to maintain constant parallelism in contact between the polishing surface and the surface to be polished, and to maintain constant contact pressure.

Furthermore, the engagement between the locking convex portion and the concave portion can prevent the shaft-equipped polishing tool connected to the tip of the shaft from wobbling laterally.

(Example) Hereinafter, an example of the polishing apparatus of the present invention will be described based on the drawings.

In FIG. 1, A denotes a housing, and the housing A is formed into a substantially pistol shape, consisting of an internally hollow body part 1 and a grip part 2 protruding from the rear part of the lower surface 1a of this body part 1.

The grip portion 2 has a cylindrical shape with an open bottom surface, and its interior communicates with an air port 3 provided at the rear end of the body portion 1. An ultra-high speed rotating air motor 4 operated by compressed air supplied from the air supply 3 is mounted inside the gripping portion 2 .

Further, on the outer periphery of the grip part 2, a grip part 5 formed into a bottomed cylinder shape using a resin material with vibration-proofing properties, specifically, a synthetic resin such as urethane or PVC sponge, or hard rubber, is attached to the grip part 2.
The grip part 5 is attached with an appropriate gap 5a left between the grip part 5 and the bottom wall of the grip part 5, and an exhaust hole 6 communicating with the inside of the grip part 4 is provided.

As shown in the figure, the grip part 5 is formed into a bellows shape so that unevenness appears alternately on the outer circumferential surface, thereby improving its vibration damping properties and reducing shocks and vibrations transmitted to the worker's hands during work. Reduce more reliably.

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

As shown in an enlarged view in FIG. 2, the outer circumferential surface 8a of the sleeve 8 is
It is formed to be slightly eccentric with respect to the center of the rotor shaft 7.

The crankshaft 10 has a ring portion 10a integrally molded at its rear end, and this ring portion 10a is fitted onto the outer periphery of the bearing 9, so that it reciprocates back and forth at extremely high speed as the rotor shaft 7 rotates. ing.

The crankshaft 10 is molded from a synthetic resin material having a desired strength so as to reduce vibration in the left-right direction when the crankshaft 10 reciprocates back and forth.

A shaft 1) is connected to the tip of the crankshaft 11).

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

Further, a clamping part 13 is provided at the tip of the shaft 11, and a shaft-equipped polishing tool B is connected via the clamping part 13.

As shown in FIGS. 3 and 4, the clamping part 13 divides the tip of the shaft 11 into upper and lower parts to form a gap +3c having a rectangular cross section between the upper piece i3a and the lower piece 13Il, and at the same time
The rear end 13C° of 3c is expanded as shown in the figure, thereby imparting appropriate elasticity to the upper piece 13a and the lower piece 13b. Further, the outer ends of the upper piece 13a and the lower piece 13b are tapered +3d, and a tightening nut 14 is screwed onto the outer periphery of the shaft 11.

The inner periphery of the tightening nut 14 is formed into a tapered shape that comes into contact with the tapered surface 13d, so that the tightening nut 14
By tightening the upper piece 13a and the lower piece 1311, the gap 13
It is designed to be elastically deformed in the direction c, and firmly clamp the shaft rod of the shafted polishing tool B which is fitted between the upper piece 13a and the lower piece 13b.

Note that the clamping portion 13 connects the shaft 11 to the crankshaft 10.
When connected to the upper and lower pieces i3a and Nb, the gap 13c between the upper and lower pieces i3a and Nb is formed so as to be located parallel to the lower surface 1a of the body part 1.

A shaft 11 is provided on the inner surface of the upper piece 13a1 and the lower piece 13b.
A recess 15 consisting of a groove extending in the length direction is formed.

As shown in FIG. 5, the shaft-equipped polishing tool B has a rectangular plate-shaped grindstone b2 provided at the tip of a shaft rod b made of a desired elastic material such as synthetic resin. 13 gaps 13
It has a rectangular cross section that can be fitted into c. In addition, the tip b of the shaft b1 is formed into a gradually tapered shape and has a cross section, and is fitted into the dovetail groove b3 provided on the upper surface of the grinding wheel b2. , ! can be attached and detached at will.

Further, on the upper and lower surfaces of the shaft rod, the upper and lower pieces 13a,
A locking protrusion b4 that engages with the recess 15 provided in i3b is provided, and the engagement between the locking protrusion b4 and the recess 15 prevents the shafted polishing tool B from moving laterally. The locking convex portion b4 extends over the entire length of the upper surface of the shaft b□ and extends from the rear end of the shaft rod b1 to the rear end of the grindstone b2 on the lower surface so that the locking convex portion b4 is elastically deformed substantially uniformly over the entire length of the shaft rod b. Formed over a period of time.

According to the shaft-equipped polishing tool B, when the shaft b1 is inserted into the gap 13c of the clamping portion 13, the grinding wheel b2 is placed above and below, that is, the polishing surface b
5 is aligned parallel to the lower surface 12 of the body part 1, so that when gripping the grip part 2 and performing polishing/grinding work, the polishing surface 5 is positioned approximately parallel to the polished surface of the workpiece. I come to do it. Furthermore, since the shaft rod b is made of an elastic material, the shaft rod deforms elastically during operation, and the parallelism of the contact between the polishing surface b5 and the surface to be polished is always kept constant. Keep contact pressure constant. Therefore, it becomes possible to obtain higher abrasive grinding accuracy.

FIG. 6 shows an example in which a shafted polishing tool B is constructed by attaching a file b6 to the tip of a shaft rod b1.

The shaft b1 has a band-shaped tip and is provided with a fitting recess b7 inside thereof that tapers gradually toward the rear end, and a locking recess b7' is provided in the middle of the fitting recess b7. Further, the above-described locking protrusion b4 is formed on the upper and lower surfaces of the shaft b0 over its entire length.

The file b2 has a rear end formed in a tapered shape that can be fitted into the fitting recess b7, and a projecting piece b8 that removably engages with the locking recess Nb7'' is provided in the middle part thereof. It is removably attached to the rod b1.Then it can be shaped into various shapes, such as a flat plate as shown in Figure 6, a substantially triangular prism as shown in Figure 7, or a curved shape as shown in Figure 8. Prepare multiple parts, replace them as desired, and attach them to the shaft b4.

Incidentally, the shafted polishing tool B shown in FIG. 5 or FIGS. 6 to 8 above is selectively used depending on the shape and material of the surface to be polished or the finishing accuracy in the stepwise polishing process. It is something.

Furthermore, in the above description, the air motor 4 is installed inside the grip part 2, but the present invention is not limited to this, and it is also possible to use an electric motor that rotates at a very high speed.

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

According to the polishing device according to claim 1, by reciprocating the shaft-equipped polishing tool at an ultra-high speed, polishing workability can be improved while maintaining high polishing accuracy, and the shaft rod can be simply inserted into the clamping portion. This allows you to align the shaft-equipped polishing tool, making the work more efficient, and reducing the impact transmitted to the worker's hands.
Vibration can be reduced and white wax disease can be prevented.

Further, according to the polishing apparatus according to claim 2, the polishing apparatus according to claim 1
In addition to this effect, higher polishing accuracy can be obtained by keeping the parallelism and contact pressure of the contact between the polishing surface and the surface to be polished constant during operation.

Further, according to the polishing apparatus according to the third aspect, in addition to the effects according to the first aspect described above, it is possible to prevent the shaft-equipped polishing tool from lateral wobbling, thereby obtaining higher polishing accuracy.

[Brief explanation of the drawing]

The drawings show an embodiment of the polishing apparatus of the present invention, in which FIG. 1 is a longitudinal sectional front view, FIG. 2 is an enlarged sectional view taken along the line (2)-(2) of FIG.
Fig. 3 is an enlarged sectional view taken along line (3)-(3) in Fig. 1, Fig. 4 is an enlarged perspective view of the clamping part, Figs. 5 and 6 are enlarged perspective views of the abrasive tool with shaft, Figures 7 and 8 are enlarged perspective views of the file. In addition, in the figure, A2 housing 1, body part 2: grip part 4. Air motor 7 °-tashaft 8 sleeve 10, crankshaft 11. Shaft 14: Tightening nut 13: Clamping part B-shafted polishing tool b,
, Shaft rod 5 lip part bl, Locking convex part I5: Concave part

Claims (3)

[Claims] (1) An ultra-high-speed rotating motor is built into a grip part protruding from the lower surface of the body of the housing, and a sleeve is fitted onto 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, inside the body, there is provided a crankshaft whose rear end is connected to the outer periphery of the sleeve and reciprocates back and forth as the sleeve rotates, and a shaft which is connected to the crankshaft and is slidably supported. divides the shaft into upper and lower parts, and provides a clamping part with a tightening nut screwed onto the outer periphery of the shaft, and attaches and detaches the shaft of the shaft-equipped polishing tool to the clamping part with a rectangular cross section that fits into the tip of the shaft. A polishing apparatus characterized in that the gripping parts are freely connected to each other, and a gripping part made of a soft resin having vibration-proofing properties is attached to the outer periphery of the gripping part. (2) The polishing apparatus according to claim 1, wherein the shaft rod of the shafted polishing tool has a desired elasticity. (3) A locking convex portion is provided on one of the upper and lower surfaces of the shaft rod of the shaft-equipped polishing tool and the inner surface of the shaft tip where the upper and lower surfaces slide, and a concave portion that engages with the convex portion is provided on the remaining other side. The polishing apparatus according to claim 1, characterized in that: