JPH01183361A - Curved surface polishing device - Google Patents

Abstract

PURPOSE:To polish precisely efficiently the surface of a workpiece having curved contour by forming a polisher portion of two layers of a resilient diaphragm-like film stretched to enclose a magnetic fluid and a resilient diaphragm-like polisher stretched for polishing on said film. CONSTITUTION:A polisher portion is formed of two layers of a resilient diaphragm-like film 13a enclosing magnetic fluid and a resilient diaphragm-like polisher 13b stretched on said film 13a to polish a workpiece 38. A working surface of the workpiece 38 held by a jig 1 faces the surface of polisher 13b and the polisher portion is moved relative to the workpiece 38 to add a magnetic field to the magnetic fluid 12 in the film 13a and press the polisher 13b against the workpiece surface. Thus, the workpiece 38 having a curved contour is polished with high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a polishing device for polishing workpieces having a wide range of curved shapes [Prior Art 1] It is a diagram showing a conventional surface polishing device using magnetic fluid disclosed in Publication No. 58-77447, in which (11) is a rotatable processing plate, (13) is a rotatable processing plate;
is a rubber plate which is a polisher, and (14) and (15) are rings for fixing the rubber plate (13). (12) is filled in the groove provided in the processing board (11), and the processing board (
11) and a magnetic fluid sealed between a rubber plate (13) and a rubber plate (13).

(28) and (29) are electromagnetic coils, (33) and (41)
) is the electromagnetic core. A workpiece (38) is bonded to the upper electromagnet core (33). (19) is an abrasive. The workpiece (38) and the processing plate (11) are rotationally driven by pulleys (37) and (27), respectively, and rotate in the same rotational direction and at the same rotational speed.

Next, based on Fig. 4 and Fig. 5, the conventional polishing device (
3), a groove provided in a rotatable processing plate (11) is filled with a magnetic fluid (12), and the magnetic fluid is transferred to a rubber plate (13) which is a polisher.
The abrasive (19) is contained in a processing chamber formed on the rubber plate (13), and the abrasive (19) and magnetic fluid (
12) is partitioned with a rubber plate (13). The workpiece (38) is immersed in the abrasive in the processing chamber, and the surface to be processed is covered with a rubber plate (13).
), the path of the magnetic flux φ shown by the dotted line in the magnetic fluid in the groove facing the workpiece (38) is created by passing current through the electromagnetic coils (28) and (29), which face each other with a gap. When a magnetic field is applied to form a magnetic field, the magnetic fluid (12) in the groove is attracted to the magnetic flux forming part, the liquid level of the magnetic fluid rises, the rubber plate (13) swells as shown by the dotted line, and the abrasive (19) across the workpiece (
38) is pressed against the processed surface. There, the rubber plate (1
3) and the workpiece (38) are both rotated and moved relative to each other to polish the surface of the workpiece.

[Problems to be Solved by the Invention] The conventional apparatus is configured as described above, and when this polishing apparatus polishes a curved workpiece, the following problems occur. Conventional equipment uses a rubber plate as a polisher, and since the abrasive grains of the abrasive do not fit well with the rubber plate, it is difficult for the abrasive grains to enter between the rubber plate and the workpiece, slowing down the processing speed. When polishing a shaped workpiece, the rubber plate has a thick film thickness, so the deformation resistance of the rubber plate is large, and the rubber plate does not come into contact with the entire surface of the curved workpiece, or even if it comes into contact with it, Since the pressure becomes non-uniform, errors in the shape of the workpiece may become large. In addition, electromagnets (33) that sandwich the processing machine (11) from above and below,
(41) are independent, so even if current is passed through the electromagnet coil, the magnetic force is small and the machining speed is slow. Since the edge of the workpiece gets caught on the rubber plate that is the polisher during polishing, polishing cannot be performed smoothly.

In particular, when the workpiece is a curved surface, it is necessary to further reduce the film thickness of the rubber plate in order to reduce the elastic deformation resistance of the rubber plate. Not only is proper polishing not possible, but the rubber plate sometimes breaks. In addition, since the workpiece is in direct contact with the electromagnet core, it is inconvenient to remove it after processing, making the processing inefficient. It is very difficult to polish curved surfaces using this equipment. The present invention has been made to solve the above-mentioned problems, and its object is to provide an apparatus that can precisely and efficiently polish the surface of a workpiece having a curved shape.

[Means for Solving the Problems 1] The curved surface polishing apparatus according to the present invention confines a magnetic fluid in the lower part of the polisher, makes the surface of the workpiece face the surface of the polisher, and connects the polisher and the workpiece. In a polishing method in which the polisher is pressed against the workpiece surface by moving both of them relative to each other and applying a magnetic field to the magnetic fluid, the polisher portion is formed of a flexible and deformable film-like material stretched to seal the magnetic fluid. The film is separated into a flexible film-like polisher for polishing stretched over the film, and an electromagnet is installed in a ring-shaped magnetic circuit that is open only in the part of the polisher section where a magnetic field is applied. The workpiece is attached to the electromagnet core, and further has a hole in which the workpiece is embedded so that the edge part of the workpiece is not exposed during polishing, and the edge part has a smooth arc shape. A jig is used to do this.

(Function) The curved surface polishing device of the present invention replaces the rubber plate, which is the polisher of the conventional device, with a flexible and deformable membrane-like film that is not permeable to fluid and is stretched to seal the magnetic fluid.
Processing speed can be improved by replacing the flexible film-like polisher stretched over the film with a separate polisher, and in an electromagnet configuration, the polisher part to which the magnetic field is applied is By providing a magnetic arm so as to open only a circular magnetic circuit, it is possible to create a magnetic force, which improves processing speed and allows the polisher to come into contact with the surface of the curved workpiece. In addition, a jig that embeds the workpiece so that the edge of the workpiece is not exposed is installed on the electromagnet core, and the edge of the jig is shaped into a smooth arc. By doing this, the polisher does not get caught on the edges of the workpiece, and polishing progresses smoothly and stably. This makes it possible to use a thinner polisher with less elastic deformation resistance, and it is easier to remove the workpiece. Scraping becomes easier, and overall curved surface polishing can be performed efficiently and smoothly.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (33) and (41) are electromagnet cores, (28
) and (29) are electromagnetic coils, (3) is an arm for making the magnetism into a closed circuit, and (1) is a workpiece mounting jig for mounting the workpiece (38) on the electromagnet core (33). ,(2
) is a jig fixing screw for attaching the jig (1) together with a workpiece (38) having a concave shape (that is, a curved surface), (11) is a processing plate, and (12) is a groove provided in the processing plate. The magnetic fluid (13a) is filled with magnetic fluid (1
(13b) is a 0.4 mm thick flexible latex rubber film for sealing the workpiece (38) having a curved surface shape.
(14) and (15) are polisher fixing plates for fixing the film (13a) and the polisher (13b), and (19) is an abrasive. The processing plate (11) and the workpiece (38) are rotated in the same direction and at the same speed.

Next, the effect will be explained. The rubber plate, which is the polisher of the conventional device, is replaced with a film-like film (13a) for sealing the magnetic fluid, and a flexible film-like polisher (13b) for polishing stretched over the film. By replacing it with a two-layered one, processing speed was significantly improved compared to the conventional one. In addition, in the configuration of the electromagnet,
By providing a magnetic arm (3) so as to open only the part of the polisher to which the magnetic field is applied, and creating a ring-shaped magnetic circuit, the magnetic force can be further improved, machining speed is increased, and curved surface shapes can be improved. Processed surface of the workpiece (38a
), the polisher (13b) can easily come into contact with the electromagnet. By attaching the jig fixing screw (2) to the iron core (33) and making the edge part (IC) of the jig (1) into a smooth arc shape, it can be attached to the edge part (1b) of the workpiece. Polishing proceeds smoothly and stably without the polisher getting caught. This makes it possible to use a polisher that is thinner and has less resistance to elastic deformation, and it is easier to remove the workpiece, which improves overall performance. In addition, curved surface polishing can be performed efficiently and smoothly.

In the above example, a 0.1 mm thick rubber film (13a) was used to seal the magnetic fluid, and a 0.4 mm polishing layer (13b) manufactured by Rodel Nitsuta was used as the polisher layer (13b). Although pads were used, any thin and flexible material that contacts the curved workpiece without resistance may be used. Also, although iron was used for the electrodes and arms of the electromagnet, any ferromagnetic material may be used. In the above example, the shape of the workpiece is concave, but it goes without saying that it may be convex. In that case, the shape of the jig will change depending on the shape of the workpiece. .

[Effect of the invention 1 As described above, the present invention provides a flexible and deformable film for sealing a magnetic fluid, and a flexible film-like polisher for polishing stretched over the film. The electromagnet is configured in a ring-shaped magnetic circuit with only the part that applies the magnetic field to the polisher section open, and the workpiece is further embedded so that the edges of the workpiece are not exposed during polishing. A jig with holes for fixing the workpiece is used, and the edges of the jig are shaped into smooth arcs, making it possible to polish workpieces with curved surfaces at high speed, while also improving machining accuracy. This has the effect of effectively polishing a workpiece having a curved surface shape.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a curved surface polishing apparatus according to an embodiment of the present invention. FIG. 2 is a sectional view showing a workpiece attached to the electromagnet core via a workpiece mounting jig. Third
The figure shows a conventional surface polishing device, FIG. 4 is a diagram showing the principle of the conventional device, and FIG. 5 is a partially sectional front view of the conventional device. In the figure, (1) is the workpiece mounting jig, (2) is the jig fixing screw, (3) is the arm, (11) is the processing plate, (12)
is a magnetic fluid, (13a) is a magnetic fluid sealing film, (
13b) is a polisher, (19) is an abrasive, (28) and (
29) is an electromagnetic coil, (33) and (41) are electromagnetic cores, (38) is a workpiece, and (14) and (15) are polisher fixing plates. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent: Masu Oiwa, Patent Attorney, Figure 2, Figure 3

Claims (1)

[Claims] (1) Confining the magnetic fluid in the polisher part, making the processed surface of the workpiece face the surface of the polisher, moving both the polisher and the workpiece relative to each other, and applying a magnetic field to the magnetic fluid. In a curved surface polishing device that presses a polisher onto a surface to be processed, the polisher portion includes a flexible membrane-like film stretched to seal the magnetic material, and a flexible membrane-like film stretched over the film for polishing. A curved surface polishing device characterized by comprising two layers: a polisher and a polisher.