JPH0644591Y2 - Mobile platen type polishing machine - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" The present invention wraps a polishing film around a moving platen of a polishing head, and vibrates the polishing head to bring a workpiece into contact with the polishing film for polishing. The present invention relates to a moving platen type polishing apparatus.

"Prior art" There is a polishing device that uses a polishing film, which is a thin polyester coated with well-controlled abrasive grains, as a polishing tool for superfinishing. As a configuration of a conventional polishing head in such a polishing device, Some are shown in FIG. 9 or FIG.

That is, as shown in FIG. 9, the polishing film F is wound around the elastic material contact roller 1 and the work W1 is brought into contact with the polishing film F located on the front surface of the elastic material contact roller 1 for polishing.

Further, in the structure shown in FIG. 10, the platen 3 is disposed between the guide rollers 2a and 2b, and the polishing film F is wound around the platen 3 while being guided by the guide rollers 2a and 2b. The work W1 is brought into contact with the positioned polishing film F for polishing.

[Problems to be solved by the invention] However, in such a conventional technique, as shown in FIG. 9, when the work W1 has a key groove, the elastic material contact roller 1 has a small radius, Since it has elasticity, the surface portion of the elastic material contact roller 1 enters into the key groove, the corners a and b are strongly contacted with the polishing film F to cause the abrasive grains to be peeled off, and in the extreme case, the cutting is caused. was there.

Further, as shown in FIG. 10, the work W1 is always in contact with the same place on the platen 3, and as a result, the fine film is fed between the back surface of the polishing film F and the contact surface of the platen 3 at a small speed. As a result of slippage, as shown in FIG. 10 (b), the surface of the platen 3 is worn and its shape changes. Especially, if the work has a small diameter, the shape changes remarkably and the platen 3 is frequently replaced or the shape is corrected. There was a problem that I had to do it.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a moving platen type polishing apparatus in which a polishing head portion is of a platen type and prevents uneven wear of the platen. I am trying.

[Means for Solving the Problems] The gist of the present invention for achieving the above-mentioned object is to wrap a polishing film around a moving platen of the polishing head, and vibrate the polishing head to work on the polishing film. Is a moving platen type polishing apparatus which is configured to bring the polishing film into contact with each other, and to feed the polishing film while holding the polishing film by applying a tensile force, and a feeding unit that draws the polishing film through the polishing head unit at a low speed. Is provided, the polishing head portion is provided with a moving platen that abuts against the back surface of the polishing film and presses the workpiece, and supports the moving platen movably along the feed direction of the polishing film, and feeds the polishing film. The moving platen type polishing apparatus is characterized in that it is biased and held so as to be positioned in the opposite direction.

"Operation" The polishing film extends from the supply unit, is wound around the polishing head unit, and is then drawn into the feeding unit. The polishing head is vibrating, and the work is brought into contact with the vibrating polishing film to perform polishing. While the polishing is being performed, the polishing film is stretched with a predetermined tension, is fed from the supply unit, is drawn into the feeding unit at a low speed, and new abrasive grains are brought into contact with the workpiece one after another.

At the start of polishing, the moving platen is located at the beginning of the moving stroke, which is the end of the polishing film in the direction opposite to the feed.
When the work comes into contact with the polishing film on the surface of the moving platen to start polishing and the polishing film is fed, the moving platen moves together with the feeding of the polishing film.

During polishing, the relative positions of the work and the moving platen change, and the work does not come into pressure contact with the same position of the moving platen, so there is no problem of partial deformation.

When the polishing is completed and the work is separated, the moving platen returns to the start end of the moving stroke to prepare for the next work polishing.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of the present invention.

As shown in FIGS. 1 to 3, a moving platen type polishing apparatus
Reference numeral 10 is formed by supporting each component on a base frame 20. That is, the polishing head portion 30 is arranged so as to project from the end of the base frame 20, the supply portion 40 is arranged at the upper end of the base frame 20, and the feeding portion 50 and the tension feeding portion 60 are arranged at the lower portion. It is set up.

A motor M1 for driving vibration on the upper surface portion 21 of the base frame 20.
The crank shaft 23 is connected to the vibration driving motor M1 through the joint 22, and the crank shaft 23 and the polishing head portion are mounted.
30 and 30 are connected by a connecting rod 24.

The polishing head unit 30 is provided with a movable platen 32 that comes into contact with the back surface of the polishing film F and presses the workpiece W, and the movable platen 32 is capable of moving back and forth along the feed direction of the polishing film F.
And is biased and held so as to be positioned in the direction opposite to the feed of the polishing film F.

The body block 31 of the polishing head unit 30 includes two parallel rods 31.
Base frame 20 that can be displaced horizontally by a and 31b
The connecting rod 24 is connected, and the connecting rod 24 is moved forward and backward by the rotation of the crankshaft 23, so that the polishing head portion 30 is vibrated.

As shown in FIGS. 1 and 4 to 6, the polishing head portion 30
Of the movable platen 32 is a flat plate in which an elastic material 32a is used for the contact surface with the work W, and rollers 33a and 33b are mounted on the upper and lower sides thereof, and guide rollers 34a and 34b are provided on the main body block 31 with the movable platen 32 interposed therebetween. Is provided.

A rail block 35 is arranged after the moving platen 32. Rail block 35 is a roller for advancing / retreating arranged at four corners.
A pneumatic cylinder 37 is provided which is fitted and held by the main body block 31 so as to be able to advance and retreat by 35a to 35d and which is operated to push out the rail block 35 in the horizontal direction.

A rail portion 36 is provided at the front end of the rail block 35, and guide moving rollers 37a to 37d mounted on the four corners of the moving platen 32.
Are fitted to the rail portion 36. This allows the moving platen
32 is movably supported along the feed direction of the polishing film F, is urged by the coil spring 38 to the start end of the moving stroke, and is stopped by the stopper pin 39.

As shown in FIGS. 1 to 3, the supply unit 40 includes a supply-side reel 41 for feeding the polishing film F and a brake 43 directly connected to a rotation shaft 42 of the supply-side reel 41. The brake 43 is configured to apply a braking force to the supply reel 41 so that the polishing film F has a predetermined tension.

The take-up unit 50 has a take-up reel 51, and a drive belt pulley 54 is attached to an end of a rotary shaft 52 of the take-up reel 51 via a friction coupling 53 to drive a feed motor M2. A toothed belt 55 is wound around a belt pulley (not shown) that is rotationally driven by a shaft.

The tension feeding unit 60 includes a feed driving roller 61 that moves the polishing film F at a constant speed and a pressure assisting roller 65.

The feed drive roller 61 and the pressure assisting roller 65 are supported on the base frame 20 by respective pivots 62 and 66.

The pivot shaft 62 of the feed drive roller 61 is directly connected to the feed motor M2,
The pressure assisting roller 65 is pivotally supported on the pivot 66 so that it can rotate freely.
Both ends of 66 are slidably fitted in and supported by elongated slide holes 25a, 25b provided in the side plates of the base frame 20.

A tension spring 67 is provided between both ends of the pivot 66 and the base frame 20.
a and 67b are stretched, and the pressure assisting roller 65 is the feed drive roller 6
Energized to be in constant contact with 1.

The polishing film F is bent by a guide roller 29 arranged near the supply-side reel 41, and is guided by the guide roller 34a and the moving platen.
32, wound around the feed drive roller 61 via the guide roller 34b,
It is wound around the take-up reel 51 by passing between the feed drive roller 61 and the pressure assisting roller 65 and then passing through the pressure assisting roller 65 in an S-shape.

Next, the operation will be described.

The polishing film F extends from the supply section 40, is wound around the polishing head section 30, and is drawn into the feeding section 50 via the tension feeding section 60. The polishing head unit 30 is vibrating, and the work W is brought into contact with the vibrating polishing film F at the tip thereof for polishing.

The rotating shaft 42 of the reel 41 on the supply side of the polishing film F of the supply section 40
A constant braking force is constantly applied by the brake 43, and the polishing film F is fed out with a predetermined tension.

The polishing film F is bent by the guide roller 29 and is bent by the polishing head portion.
The roller 30 is wound around the guide roller 34a, passes through the front surface of the movable platen 32, is wound around the guide roller 34b, and is transferred so as to extend to the tension feeding unit 60.

In the polishing head portion 30, the vibration driving motor M1 rotates the crankshaft 23, and the connecting rod 24 transmits the forward / backward movement to vibrate the parallel rods 31a and 31b, whereby the polishing film F is pneumatically driven. Moving platen pushed by cylinder 37
The entire main body block 31 vibrates in a state where 32 projects forward, and the work W abuts on the polishing film F at the tip position of the moving platen 32 to perform polishing.

The feed drive roller 61 of the tension feed unit 60 rotated by the feed motor M2 sandwiches the polishing film F with the pressure assisting roller 65 biased by the tension springs 67a and 67b, and moves the film F at a constant speed. It is sent to the winding side reel 51. Polishing film F
Since the feed drive roller 61 and the pressurizing auxiliary roller 65 are wound in an S shape, they can be fed stably without slipping.

The winding speed of the winding-side reel 51 is faster than the drawing speed of the tension feeding unit 60, and the polishing film F receives a slip force due to the slip of the friction coupling 53 during winding and the tension feeding unit. The polishing film F is wound around the supply-side reel 41 of the supply unit 40 by the winding amount corresponding to the amount unrolled from 60.

The polishing film F extends from the supply-side reel 41 of the supply unit 40, is wound around the polishing head unit 30, and is then drawn by the winding-side reel 51 of the feeding unit 50. While the polishing is being performed, the polishing film F is stretched with a predetermined tension, fed out from the supply section 40, drawn into the feeding section 50 at a low speed, and new abrasive grains come into contact with the work W one after another.

At the start of polishing, as shown in FIG.
Is located at the beginning of the movement stroke, which is the opposite end of the feed of the polishing film F. Work W moves Platen 32
When the polishing film F is brought into contact with the surface of the polishing plate and polishing is started, and the polishing film F is sent, the moving platen 32 follows the feeding of the polishing film F and counts the friction between the polishing film F and the elastic material 32a on the surface of the moving platen 32. Therefore, the moving platen 32 resists the biasing force of the coil spring 38 and the polishing film F
Move with.

While the polishing is being performed, the relative positions of the work W and the moving platen 32 change, and the work W does not come into pressure contact with the same position of the moving platen 32, so that the problem of partial deformation does not occur. The length of the moving platen 32 in the moving direction is set longer than the length of the polishing film F required to finish the work W, and when the polishing of the work W is finished,
As shown, the moving platen 32 is near the end of its moving stroke.

When the polishing is completed and the work W is separated, the moving platen 32 returns to the start end of the moving stroke by the urging force of the coil spring 38 to prepare for the next work W polishing.

The polishing film F is supplied to the moving platen 32 at a stable constant speed, and the polishing surface of the work W is ensured to have a uniform and finished surface.

[Advantage of Invention] According to the moving platen type polishing apparatus according to the present invention, since the work is brought into contact with the work by pressing the polishing film against the work by the moving platen, the work having the key groove is provided. Even if it is, it does not bite, and the moving platen does not wear or deform locally, it can perform stable polishing, quality control is easy, and a polishing device with excellent performance is provided. Become.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 8 show a first embodiment of the present invention. FIG. 1 is a front view of a moving platen type polishing apparatus, FIG. 2 is a side view of the same, and FIG. The figure is also a plan view and FIG. 4 is FIG. 1 IV-
IV line sectional view, FIG. 5 is a sectional view taken along line VV of FIG. 3, FIG. 6 is a sectional view taken along line VI-VI of FIG. 3, and FIG. 7 is a schematic view of a polishing head at the start of polishing, and FIG. Is a schematic view of a polishing head at the end of polishing, FIGS. 9 and 10 show a conventional example, and FIG. 9 is a schematic view of polishing by an elastic material contact roller 1, FIG.
(A), (b) is a schematic diagram which shows polishing by a fixed platen. W ... Work, F ... Polishing film 10 ... Moving platen type polishing device 20 ... Base frame, 21 ... Upward surface part 22 ... Joint, 23 ... Crank shaft 24 ... Connecting rod, M1 ... Vibration driving motor 30 ... Polishing head part , 31 ... Main body block 32 ... Moving platen 34a, 34b ... Guide roller 35 ... Rail block, 38 ... Coil spring 40 ... Supply section, 41 ... Supply side reel 43 ... Brake, 50 ... Take-up section 51 ... Winding side reel, 53 ... Friction coupling 60 ... Tension feed section, 61 ... Feed drive roller 65 ... Pressurization auxiliary roller, M2 ... Feed motor

Claims (1)

[Scope of utility model registration request] 1. A moving platen-type polishing apparatus in which a polishing film is wound around a moving platen of a polishing head portion, and a work is brought into contact with the polishing film while vibrating the polishing head portion to perform polishing. Provided with a feeding unit that feeds while holding the polishing film, and a drawing-in unit that draws the polishing film that has passed through the polishing head unit at a low speed, and the polishing head unit contacts the back surface of the polishing film to the work. A movable platen-type polishing characterized in that a movable platen for press contact is provided, the movable platen is supported so as to be movable along the feed direction of the polishing film, and is biased and held so as to be positioned in the opposite direction of the feed of the polishing film. apparatus.