JPS5817722Y2 - Grinding wheel dressing device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a grindstone dressing device that performs dressing by spraying loose abrasive grains, sand, etc. onto the surface of the grindstone.

To dress a hard diamond whetstone or CBN whetstone made of abrasive powder, a stick whetstone formed by soft sintering of alundum abrasive grains or carbon alundum abrasive grains is pressed against the surface of the whetstone to be dressed while wiping off grinding fluid. Many methods are used to scrape off the binder that holds the diamond abrasive grains or CBN abrasive grains.

However, with this method, when the stick grinding wheel is pressed onto the grindstone to be dressed, the random abrasive grains or alundum abrasive grains of the stick grinding wheel directly collide with the diamond abrasive grains or CBN abrasive grains, and the diamond abrasive grains or CBN abrasive grains Small cutting edges may be damaged or cracks may occur in the abrasive grains.

Therefore, if the grinding operation is started after dressing, the abrasive grains may be destroyed or fall off, resulting in premature wear of the expensive diamond grindstone or CBN grindstone.

This invention was made with the aim of eliminating such drawbacks, and is a grindstone dressing device that dresses the surface of the grindstone by spraying free abrasive grains, sand, glass powder, etc. together with pressure fluid onto the grindstone to be dressed. This makes it possible to dress the grindstone without damaging the abrasive grains.

This invention will be described in detail below with reference to an illustrated embodiment.

In the figure, reference numeral 1 denotes a grindstone such as a diamond grindstone or a CBN grindstone, which is housed in a cover 2 of a case with an open front.A truing tool 3 made of a diamond grindstone is installed at the rear of the grindstone 1 so as to be able to approach and separate it. It is being

Reference numeral 4 denotes an injection mechanism provided on the upper part of the cover 2, which includes an injection nozzle 5 and a traverse device 6 that reciprocates the injection nozzle 5 in the axial direction along the surface of the grindstone 1.

The tip side of the injection nozzle 5 projects into the cover 2 and is held at an angle of 15 to 30 degrees with respect to the normal to the grindstone 1, and the injection port 5a at the tip is opened close to the surface of the grindstone 1. has been done.

Further, the base end side of the injection nozzle 5 is connected to a mixing valve 8 via a conduit 7.

Mixing valve 8 A pressure reducing valve 10 from a fluid pressure source 9 such as a compressor
Fluid pressure such as compressed air (4 to 8 kg/cm2) supplied through the
325), etc., at a fixed ratio, and the pressure fluid and powder mixed by this mixing valve 8 are reciprocated along the surface of the grinding wheel 1 at a speed of 3 to 100 m/min. It is ejected from the moving injection nozzle 5 toward the surface of the grindstone 1.

On the other hand, at the upper edge of the opening 2a of the cover 2, a grinding fluid supply nozzle 11 is provided facing downward.

The grinding fluid spouted from the grinding fluid supply nozzle 11 at a pressure of 2 to 3 kg/cm2 cleans the surface of the grindstone 1,
At the same time, the loose abrasive grains etc. that have come off due to dressing are washed away, and at the same time, the opening 2a of the cover 2 is covered with a liquid film when it falls, thereby preventing the powder and granules ejected from the injection nozzle 5 from scattering from the opening 2a. It has the effect of

In the above embodiments, free abrasive grains such as Al2O3 and SiC were used as the powder, but the same effect can be obtained with sand, glass, etc.

Furthermore, by setting the grindstone rotation speed lower than the grinding conditions, the time required for dressing can be significantly shortened.

This is considered to be due to the influence of the fluid pressure film accompanying the rotation of the grindstone 1.

Therefore, it is possible to slow down the rotation of the grindstone 1 in order to reduce the fluid film caused by the rotation of the grindstone, but this is not a good idea because the grinding machine itself becomes complicated.

Furthermore, if the particle size of the powder is made coarser, the abrasive grain breakage efficiency increases and the dressing efficiency also decreases.

On the other hand, even if the grain size is made finer, the dressing efficiency decreases, so it is necessary to select an appropriate grain size depending on the grindstone 1.

In addition, the material of the powder material is Al2O if the bonding degree of the abrasive grains is weak.
3, and if the material is hard, the dressing effect will be further improved if SiC or the like is selected.

As described in detail above, this device is designed to dress the surface of the grinding wheel 1 by blowing powder such as free abrasive grains together with a pressurized fluid such as air to dress the surface of the grinding wheel 1. The time required for dressing is significantly shortened compared to dressing with a grindstone, and the abrasive grains of the expensive grindstone 1 such as a diamond grindstone or a CBN grindstone are not damaged.

In addition, since the injection nozzle is reciprocated in the axial direction of the grinding wheel by a traverse device, dressing is possible regardless of the width of the grinding wheel, and the opening of the cover 2 is formed by the liquid film of the grinding fluid supplied to the grinding wheel. Since the cover 2a is closed, the powder and granules used for dressing will not be scattered outside the cover 2, so it is safe.

[Brief explanation of drawings]

The drawing is a partially cutaway side view showing an embodiment of this invention. 1 is a grindstone, 2 is a cover, 2a is an opening, 5 is a spray nozzle,
11 is a grinding fluid supply nozzle.

Claims (1)

[Scope of utility model registration request] A spray nozzle 5 that sprays powder and granules onto the surface of the grindstone 1 with fluid pressure while reciprocating in the axial direction along the surface of the grindstone 1 to be dressed by a traverse device 6, and an opening in a cover 2 that houses the grindstone 1. Located above 2a, grindstone 1
A grindstone dressing device comprising a grinding liquid supply nozzle 11 which supplies grinding liquid to the grinding liquid and which is provided so as to close an opening 2a with a liquid film of the grinding liquid.