JPH0426981B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a metal polishing machine that can efficiently, accurately and beautifully polish small metal products such as rings, ring frames, and precision machine parts. .

[Conventional technology]

Traditionally, rings and ring frames made of precious metals were cast in molds and then polished by hand. When polishing by hand, even a skilled worker can only polish around 20 gold frames in a day, and when platinum is harder than gold, work efficiency drops significantly. Furthermore, the precious metal powder that has been scraped off is scattered as dust, and although efforts are being made to collect and recover the shavings, most of it is scattered.
Its amount reaches 5-6%. Since it is originally an expensive metal, the amount that was dissipated in this way was difficult to ignore.

[Technical problem to be solved by the invention]

High-speed polishing using a polishing machine was considered, but since the ring consists of a combination of irregular and delicate curves, it could not be matched with the regular movement of the polishing machine, resulting in areas where the precious metal would be polished too much locally and areas that would not be polished. It was thought that the delicate curved surface of the main body could not be expressed and that it was essentially unsuitable for mechanical polishing.

The present invention polishes all surfaces of a metal piece into the intended shape with uniform torque, no matter what shape it is.
Moreover, it is an object of the present invention to provide a metal polishing machine that can completely recover polishing powder.

[Means of problem solving]

The structure of the present invention is to divide the surface of a disk made of a non-magnetic material by one or more straight lines passing through the center point, and to alternately designate each fraction as a N-pole zone and a S-pole zone. A permanent magnet is buried with the top surface as the north pole, and a magnetic disk that can rotate at high speed is installed in the south pole zone, with a permanent magnet buried with the top surface as the south pole.
A fixing plate made of a non-magnetic material is provided on top of the disc with a small gap, and one or two
The present invention is characterized in that a container made of the above-mentioned non-magnetic material is detachably charged, and a large number of polishing pieces made of a metal to be polished and a magnetic material, and a plurality of permanent magnet pieces are charged into the container.

The container according to the present invention requires a size that allows the small pieces of metal to be polished to rotate freely on its axis, and a lid that prevents the contents from spilling during the polishing operation. Preferably, it is a cylindrical container which is removable and whose contents can be replaced and cleaned as necessary.

A large number of small pieces for polishing are charged into a container together with the metal to be polished, and when placed in a magnetic field, these small pieces become magnetized and become connected to each other in a chain with S and N poles, but this magnetic field is instantly reversed. In order to do this, it is turned over and a part of it penetrates into the fine irregularities of the metal to be polished, and is also violently agitated and vibrated, so that the metal to be polished is polished uniformly. Materials for the polishing pieces include hard stainless steel, other steels, nickel steel, chrome steel, etc. Among them, any magnetized material that is hard enough to polish metal pieces and is resistant to rust may be used. The shape is not particularly limited and may be rod-shaped, bent rod-shaped, oval, spherical, etc., and the type and size of the polishing pieces are selected as appropriate depending on the type and shape of the metal to be polished, the degree of polishing, etc. . Generally spherical,
A dogleg shape, a bar shape, etc. may be used as long as the unevenness of the material to be polished is removed to the extent that it looks like a mirror surface to the naked eye.

In addition, if a permanent magnet larger than the polishing piece is inserted together with the polishing piece, even if the polishing piece is made of a non-magnetic material, the rotation of the large permanent magnet will cause the agitation and polishing force of the magnetic polishing piece. is doubled, and the non-magnetic polishing particles are agitated to impart polishing power. In addition, the container contains surfactants,
Polishing agents, rust inhibitors, etc. may be added with a small amount of water.

The magnetic field in which the S and N poles alternate can be created by alternately providing an even number of magnetic pole zones such as 1 pair, 2 pairs, and 3 pairs in a disk and rotating it at high speed, as shown in Figure 2. good. When there are two pairs of S-pole and N-pole zones, that is, two pairs of each, when the disk rotates once, the magnetic field is converted four times in the order of S→N→S→N, resulting in efficient polishing.

The number of times the magnetic field is converted is 100 to 20,000 times/minute, preferably 200 to 10,000 times/minute. In general, the more the number of conversions increases, the more beautiful the finish will be, but even if only the number of conversions is increased, the size and shape of the polishing piece, the shape and size of the permanent magnet, the relationship between the metal to be polished and the container, etc. are related to each other. Therefore, simply increasing the number of conversions does not always result in preferable polishing.

[Effect]

In the present invention, fan-shaped S-pole zones and N-pole zones are alternately formed radially from the center on the bottom surface of a non-magnetic container in which a large number of polishing pieces made of magnetic material are charged together with the metal to be polished. The arranged disk is rotated, and the non-magnetic container is placed in a magnetic field in which the south pole and north pole mutually convert violently and evenly. Because the polishing pieces are placed in a strong magnetic field, they are strengthened and connected to each other at the S and N poles, but the magnetic field changes instantly, causing them to reverse, causing the connection to separate, or the polishing pieces themselves to rotate violently, causing disturbance. In this state, the polishing particles forcefully penetrate into the fine details of the metal to be polished, polishing the entire surface uniformly.

In particular, when using a rod-shaped material as a polishing piece, once magnetized, the polishing piece is influenced by the next approaching magnetic field line of a different polarity, and is attracted while falling over and reversing. This process is repeated alternately, so the polishing It's efficient.

〔Example〕

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a perspective view showing a state in which the container is fixed, and Fig. 4 shows a state in polishing. FIG. 3 is a cross-sectional view of the container.

Reference numeral 1 denotes a motor case, in which a motor 2 rotated by an AC power source is housed. The rotation speed was adjusted by an inverter (not shown) inserted between the power source and the motor. The rotation of the motor 2 is directly transmitted to the rotating disk 3. The rotating disk 3 is made of a magnetic material such as aluminum metal or plastic, and forms an even number of magnetic pole zones 4 as shown in FIG.
They were arranged so as to be sandwiched between magnetic pole zones consisting of poles. The magnetic pole zone 4 may be embedded with permanent magnets having both poles on the upper and lower surfaces, but in this embodiment, six strong bar magnets made of alnico 5, which have poles at both ends, are placed in each magnetic pole zone, with the same pole. It was buried facing the top.

A stationary plate 5 is provided on the rotating disk 3 with a space such that the rotating disk does not come into contact with it, and is made of a non-magnetic material, and in this embodiment, an aluminum plate is used. 6 is a polishing casing, which has a lid 7.
8 is a stopper for the lid 7. A table 9 was formed on the fixed plate 5 by covering the inner periphery of the polishing casing 6 with an elastic material. 10 is a container, and 11 is a frame for fixing the container 10. The container 10 has a cylindrical main body 12 and a fitting lid 13 that protrudes from the main body in the outer circumferential direction. 14
is a fitting protrusion. As shown in FIG. 3, the frame 11 is provided with a plurality of holes 15 into which the main body 12 can be easily inserted and which do not allow the fitting lid 13 to pass through.
The height of the stand was such that when the frame was placed on the stand 9 with the container 10 attached to the hole 15, the bottom of the container would come into contact with the fixing plate. Two fixing rods 16 are inserted into fixing holes 17 provided in the center of the frame 11 at positions corresponding to the fixing rods 16 to prevent rotation of the frame.

18 is a gold ring, 19 is a small polishing piece,
In this example, hard stainless steel with a diameter of 0.6 mm was used. The small polishing piece 19 is magnetized because it is placed in a strong magnetic field, and when the disc is rotated by the motor, the container is pulled together with the magnetic attraction force and rotates, but the frame 11 is fixed by the fixing rod 16 and fixing hole 17. It cannot be rotated because it is Therefore, only the internal polishing pieces rotated vigorously to evenly polish the surface of the ring. When rotated at 500 RPM for about 2 hours using a rotating disc with a diameter of about 30 cm, it was polished to the point that it could be used as is.

In the present invention, non-magnetic materials were used except for the strong magnet that forms the magnetic field and the small polishing piece 19.

〔Effect of the invention〕

According to the present invention, the complex curved surface of the demolded metal to be polished can be polished to the same thickness at high speed without deforming it. Furthermore, since polishing is performed in a sealed system, the polished metal powder can be completely recovered without scattering.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a sectional view taken along the line -- in FIG. It is a sectional view of a container showing a state. In the drawings, 1 is a motor case, 3 is a rotating disk, 4 is a magnetic pole zone, 5 is a fixed plate, 7 is a lid, 9 is a stand, 10 is a container, 11 is a frame, 12 is a container body, 1
3 is a fitting lid, 14 is a protrusion, 15 is a hole, 16 is a fixing rod, 17 is a fixing hole, 18 is a ring, and 19 is a small polishing piece.

Claims (1)

[Claims] 1. The surface of a disk made of a non-magnetic material is divided by one or more straight lines passing through the center point, and each fraction is alternately designated as a north-pole zone and a south-pole zone. A permanent magnet is buried with the upper surface as the north pole, and a magnetic disk that can rotate at high speed is installed in the south pole zone with the permanent magnet buried with the upper surface as the south pole. A fixed plate made of a magnetic material is provided, a container made of one or more non-magnetic materials is removably fitted onto the fixed plate, and the metal to be polished and a large number of polished particles made of magnetic materials are placed in the container. A metal polishing machine characterized by being loaded with small pieces. 2 The surface of a disc made of non-magnetic material is divided into one or more straight lines passing through the center point, each division is alternately designated as a N-pole zone and a S-pole zone, and a permanent magnet is placed on the upper surface of the N-pole zone. A magnetic disc that can rotate at high speed is installed in the S-pole zone, with the upper surface of the permanent magnet buried as the S-pole. A container made of one or more non-magnetic materials is removably placed on the fixed plate, and the metal to be polished, a large number of polishing pieces, and a plurality of permanent magnet pieces are placed in the container. A metal polishing machine characterized by: