DE3307599A1 - DRESSING DEVICE - Google Patents

Description

Applicant: Seiko Seiki Kabushikl Kaisha, Chiba, Japan

Dressing device

The invention relates to a dressing device for a grinding machine.

It is well known that after a certain amount of wear and tear on a rotating grinding wheel A dressing is required, which is carried out with a diamond dresser. Known diamond dressers consist of a dresser with a single grinding wheel and a rotating dresser. The dressing device is driven after the grinding table has been moved back after a workpiece has been finished. The dressing device is converted into a Moved position in which the dressing device and the grinding table after Dressing interferes with one another in that a cross feed of the dresser with a single grinding body against an outer peripheral part of the rotating grinding wheel. The dressing is carried out Caused feed of the rotating dresser to the outer circumference of the grinding wheel.

When using a dressing diamond, the abrasive grains, which are arranged irregularly in the surface of the grinding wheel, interact with it an end portion of the diamond, which may cause irregular vibrations so that a geometrically accurate shape cannot be easily obtained can be. It is therefore necessary to make a relatively large number of dressing movements to be carried out, so that there is a correspondingly long dressing time.

Such vibrations can also cause cracks in the grinding wheel the abrasive grains and the binding material, resulting in additional wear and a change in shape of the abrasive article can. In order to carry out very precise grinding processes and to achieve a good grinding quality, it would therefore be desirable to avoid disadvantages of this type to be avoided immediately.

When using rotating diamond dressers, the dressing time can be reduced in can be shortened to dressing diamonds. In doing so, however, the cut areas the abrasive grain wears out through interaction with the diamond, or by increasing the grinding force and reducing the cutting force.

hen it is also the accuracy with regard to the finishing of a workpiece allows a rotating abrasive dresser to be used Such dressers are rotated with the grinding wheel so that cracks in the material can be caused by compressive stress. There one ) he cutting force occurs, the properties of the grinding tool can be impaired.

; The object of the invention is to overcome difficulties of this type as much as possible avoid. According to the invention, dressing takes place with a grinding body which enables a short dressing time compared to a dressing diamond and consists of a grinding wheel with very small differences compared to the grinding wheel to be dressed, causing damage for the grinding wheel during dressing is reduced. Through the Another purpose of the invention is that a very high accuracy of the grinding wheel and a good cutting performance can be achieved.

te grinding machine according to the invention therefore has a first dressing device with a rotating dressing body, and a second dressing device for the first dressing device.

hand of the drawing the invention is to be explained in more detail, for example, demonstrate:

|. 1 shows a plan view of an internal cylindrical grinding machine with a dressing device according to the invention;

|. 2 shows a side view of the internal cylindrical grinding machine in FIG. 1;

l. 3 shows a plan view of a grinding machine with a modified embodiment a dressing device according to the invention; and

. 4 is a side view of the grinding machine in FIG. 3.

The internal cylindrical grinding machine shown in FIGS. 1 and 2 has a grinding wheel table 2, which is slidably arranged on a work table 1. A cutting table 3 is arranged opposite the abrasive body table 2. One The grinding spindle 4 driven by a motor M1 is arranged on the table 2. A main shaft 5 is mounted on the table 3. A workpiece W arranged on the table 3 is opposite the grinding body 6 on the grinding spindle 4 arranged.

The grinding wheel table 2 on the cutting table 3 is with the help of a cylinder advanced from a starting position (dressing position) and withdrawn from the dressing position. The table 3 is transverse to the direction of movement of the grinding wheel 6 with the help of a servo motor and a drive spindle during a back and reciprocating, so that the inner surface of a workpiece W can be ground due to this movement.

A second grinding wheel table 8 is detachably arranged on the table 1. It a feed mechanism having a motor M2 and a screw spindle 7 is provided. A rotating dressing body 10 is arranged on the table 8, the spindle 9 of which is driven by a motor M3.

An L-shaped frame 11 is arranged above the second grinding spindle 9. A second dressing device 13 is powered by a motor M4 via a screw spindle 12 can be driven in order to dress the dressing grinding body 10 in a lower position when it comes into contact with it.

The second dressing device 13 is longitudinally along the frame

11 out and contains a spindle frame 14, which passes through the screw spindle

12 is movable. A spindle 15 is driven by a motor M5 which is arranged on the spindle frame 14. A rotating dressing diamond 16 can be displaced upwards and downwards with respect to the dressing grinding body 10 and arranged at one end of the spindle 15.

With this internal cylindrical grinding machine, after grinding the workpiece W the grinding table 2 is pushed back, the second grinding table 8 is pushed forward to the grinding table 2, and the outer circumference of the grinding wheel 6 and the Dressing grinding body 10 come into contact during a rotation, the outer circumference of the grinding body 6 being dressed in that a difference the circumferential speed of the two grinding wheels is available.

The dressing abrasive body 10 consists of abrasive grains in a binding material are bonded, and is worn during the dressing of the grinding wheel 6. The second dresser 13 is after the occurrence of wear

it moves the dressing body 10 downwards, so that the dressing diamond 16 τ comes into contact with the grinding wheel dressing body 10 in order to dress it.

s are numerous materials for the manufacture of the grinding wheel 10 beannt, in particular abrasive grains of high quality and hardness and suitable binding materials. With such a rotating dressing wheel The dressing time can be reduced significantly compared to known dressing diamonds. An initial wear can be kept very low, a the dressing is effected with the aid of abrasive grains which have a very small difference in hardness, so that better machining of the abrasive grain than can be achieved using a rotating dressing diamond.

ei this embodiment, in which a diamond dresser 10 with several When diamond is used, a satisfactory dressing time can be obtained in the dresser 10 because of the dressing of the dresser 10 can be carried out during the grinding operation of the grinding machine.

The embodiment shown in FIGS. 3 and 4 is used as a second monitoring device a dressing diamond with a one-piece diamond. The second dressing device 33 consists of a table 22, which by NEN screw spindle feed mechanism 21 is displaceable relative to a workpiece W, which is arranged on a workpiece spindle 20. A ; grinding body 24 is rotatably arranged at the end of a grinding spindle 23, the ι the table 22 is mounted. A second table 26 for dressing can be tamed arranged. At the end of a grinding spindle 27 is a dressing grinding > rper 28 arranged. A cutting table 30 is slidable back and forth opposite the dressing wheel 28. A motor M10 must be used for the drive, which is arranged on the frame 29. The dressing diamond has a n-piece diamond tip 32, which opposite the dressing body 28 is organized.

sr grinding wheel 28 is withdrawn to a safety position as soon as is truing of the sharpening body 24 is finished. Then the dresser becomes 31 r second dressing device 33 advanced so that the diamond tip 32

the outer circumference of the grinding wheel 28 engages and a transverse displacement with the help of a motor M11, so that a suitable shape of the dressing body 28 can be achieved by repeating the dressing movements. 12 - M15 are motors for cutting feed and spindle drive.

si the described embodiments is therefore the grinding wheel with

33Ü7599

Dressed with the help of a rotating dressing tool, which in turn a second dressing device is dressed. This allows the dressing time to be considerable compared to using a single diamond dresser can be reduced, and a geometrically very precise shape can be achieved in a simple manner during dressing. It can be such a control With a reduction in the risk of damage to the grinding wheel, a dressing wheel that is particularly well suited for the intended use takes place made of appropriately selected materials is used, so that initial wear effects can be avoided. Further it is possible to finish grinding a grinding wheel in a sharp state, since the dressing is achieved by contact between the grinding wheels, so that a good cutting performance of the grinding wheel can be achieved.

Claims (1)

Applicant: Seiko Seiki Kabushiki Kaisha, Chiba, Japan Claim Dressing device for a grinding machine with a relative to the grinding wheel (6; 24) displaceable feed table (8; 26), with one on the feed table arranged, by means of a drive in rotation, the dressing grinding body (10; 28) for dressing the grinding wheel (6; 24), as well as with a second feed table (14; 30) which is arranged movably relative to the dressing grinding body (10; 28) and on which a second dressing device (13; 31) for dressing of the dressing body (10; 28) is arranged.