JPS6043274B2 - Grinding wheel dressing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for dressing a grinding wheel using a hard material such as cubic boron nitride as abrasive grains. The purpose is to eliminate wastage of free abrasive grains by effectively and smoothly penetrating the abrasive grains.

Conventionally, when dressing a grinding wheel whose abrasive grains are made of hard material such as cubic boron nitride, a dressing wheel made of hard metal such as hardened steel is placed opposite to this grinding wheel with a small gap between the two wheels. A dressing solution mixed with free abrasive grains for dressing is supplied to the grinding wheel, and the bond holding the abrasive grains is scraped off by the free abrasive grains under the backup of the dressing wheel to dress the grinding wheel.

However, in this case, the size of the free abrasive grains is extremely small, about 100μ, so the dressing liquid supplied to the gap flows to both sides of the grinding wheel and dressing wheel.
H゛Kase...,,斡,Re4゛,Reyo Rokukonin runs away. This not only wastes the free abrasive grains, but also causes the problem that the free abrasive grains passing through the gaps are considerably limited and cannot perform an effective dressing action. The present invention has been made to solve this problem, and uses a pair of wheels to prevent the dressing liquid containing free abrasive grains from flowing out from the gap between the grinding wheel and the dressing wheel to both sides of the wheels. The gist is that the shielding member is used to prevent this.

Embodiments of the present invention will be described below based on the drawings.

First, 1 is a base of a grinding machine equipped with a dressing device according to the present invention, and an unillustrated grindstone head slidably mounted on this base 1 has cubic boron nitride or diamond on the outer peripheral surface of an aluminum disk. A grinding wheel 2 is rotatably supported, and has abrasive grains made of a hard material such as the following, fixed in a layered manner by a thermosetting resin bond. Also, base 1 has table 3
is placed slidably in a direction parallel to the axis of the grinding wheel 2,
'The base 4 of the dressing device fixed to this table 3
A support stand 5 is mounted to be slidable toward the grinding wheel 2. A feed screw shaft 6 rotatably supported by the base 4 is screwed into the support 5. Furthermore, a dressing wheel 7 made of hard metal such as carbon steel or hardened steel and having a disk shape and having approximately the same width as the grinding wheel 2 is rotatably supported on the support stand 5 in parallel with the grinding wheel 2. , is rotated by a motor 8 fixed to the support stand 5 in a direction opposite to the rotation of the grinding wheel 2 so as to reduce the peripheral speed relative to the grinding wheel 2. No 1
0 is a wheel guard that covers the dressing wheel 7, and at the upper end of this guard 10, a dressing liquid (described later) is applied to a minute gap (
A nozzle 11 that supplies the free abrasive grains 13 (about 1 h in diameter) t, which will be described later, is fixed downward. This nozzle 11 is connected to a pump P in a storage tank 12 in which dressing liquid is stored.
connected via. For example, the dressing liquid is prepared by mixing 500y of free abrasive grains 13 (average diameter of about 100μ) for dressing made of alumina, silicon carbide, etc. into the grinding liquid 10'. A stirring blade 14 mixes the grinding fluid and the free abrasive grains 13, and is rotated by a motor 15 fixed to the storage tank 12.

Reference numeral 20 denotes a gate-shaped support member fixed to the wheel guard 10, and leg portions 20a and 20b of this support member 20 are opposed to each other with the dressing wheel 7 in between.

A pair of shielding members 21 and 22 are fixed to the leg portions 20a and 20b at right angles to the axes of the grinding wheel 2 and the dressing wheel 7 to shield the vicinity of both sides of the gap t.
are the grinding wheel 2 and dressing wheel 7 near the gap t.
The shielding member 22 faces the other side surfaces 2b, 7b of both cars 2, 7 near the gap t with a predetermined gap D2. Further, nozzles 23 and 24 are fixed to the leg portions 20a and 20b so as to face the side surfaces 7a and 7b of the dressing wheel 7, respectively. The openings are opened toward the gaps Dl and d2. Furthermore, the nozzles 23 and 24 are provided with support members 20.
A communication passage 28 is formed in the passage 28, and a pressurized air source 30 is connected to the communication passage 28 via a connecting vibrator 29. And these nozzles 23, 24, injection port 25
, 26, the communication path 28, the connecting vibrator 29, the pressurized air source, etc., are supplied to the gap t. A blocking device 31 is configured to prevent the dressing liquid from flowing out from the gaps Dl and d2. Although a pressurized air source is connected to the connecting vibrator 29 in the blocking device, a grinding fluid source may also be connected thereto. Next, the operation of the above configuration will be explained.

After truing the grinding wheel 2 using a truing tool (not shown), the dressing wheel 7 is removed by moving the table 3.
is opposed to the grinding wheel 2, the support base 5 is appropriately moved toward the grinding wheel 2 by the rotation of the feed screw shaft 6 until the gap t is formed between the outer peripheral surfaces of the dressing wheel 7 and the grinding wheel 2. be done. Thereafter, pressurized air is supplied from the pressurized air source 30 to the nozzles 23 and 24 via the connecting vibe 29 and the communication path 28, and this pressurized air passes through the gaps Dl and d2 from the jet ports 25 and 26, and is aired here. It is ejected toward the grinding wheel 2 while forming a curtain. Subsequently, the dressing liquid is supplied from the nozzle Jll to the gap t by the operation of the pump P, and the free abrasive grains 13 in this dressing liquid are backed up by the dressing wheel 7 while passing through the gap t. It bites into the bond holding the abrasive grains and scrapes them off, causing the abrasive grains to protrude from the bond and dressing the outer peripheral surface of the grinding wheel 2. During this dressing, the dressing liquid that accumulates slightly above the gap t is
Although it tends to flow out to both side surfaces 2a, 2b and 7a, 7b of the grinding wheel 2 and dressing wheel 7, this outflow is almost completely blocked by the shielding members 21, 22.

Furthermore, the shielding members 21 and 22 alone cannot completely prevent the dressing liquid from flowing out, and the dressing liquid flows through the gap Dl.
Although it tries to escape to the outside through d2, it is reliably blocked because an air curtain is formed in the gaps Dl and d2 by the pressurized air ejected from the nozzles 23 and 24. Therefore, the free abrasive grains 13 effectively and smoothly enter the gap t without escaping together with the dressing liquid, thereby imparting an effective dressing action to the outer peripheral surface of the grinding wheel 2. In the above embodiment, the blocking device 31 is provided to completely prevent the dressing liquid from escaping from the vicinity of the gap t to the outside, but it does not necessarily need to be provided.

As described above, the present invention provides an apparatus in which a dressing wheel is opposed to a grinding wheel with a small gap therebetween, and a dressing liquid containing free abrasive grains is supplied to the gap to dress the grinding wheel. Shielding members are installed opposite both sides of the grinding wheel and the dressing wheel in the vicinity of the gap to prevent the dressing liquid from flowing out to the sides, so that free abrasive grains are released together with the dressing liquid to the outside. The free abrasive grains can effectively and smoothly enter the gap without escaping to perform an effective dressing action, and furthermore, since free abrasive grains are not wasted, it is possible to reduce the amount of free abrasive grains.

[Brief explanation of drawings]

1 is a diagram showing a dressing device for a grinding wheel according to the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line ■--■ in FIG. 2... Grinding wheel, 5... Support stand, 7...
... Dressing car, 11 ... Nozzle, 1
2...Storage tank, 13...Free abrasive grains,
20... Supporting member, 21, 22... Shielding member, t... Gap.

Claims (1)

[Claims] 1 A dressing wheel is placed opposite a grinding wheel whose abrasive grains are made of hard material such as cubic boron nitride with a small gap, and a dressing liquid mixed with free abrasive grains for dressing is supplied between the two wheels to form a free abrasive. In a dressing device for dressing the outer circumferential surface of a grinding wheel with grains, a pair of shielding members for shielding the vicinity of the gap are disposed facing each other on both sides near the gap between the grinding wheel and the dressing wheel. Features: Grinding wheel dressing device.