JPS59343B2 - Toishi Gourmano Dressing Hohou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dressing a grinding wheel using a hard material such as cubic boron nitride as abrasive grains, and its purpose is to dress the grinding wheel safely and efficiently. The purpose is to provide a method.

Conventionally, when dressing a grinding wheel with a cubic boron nitride abrasive grain layer fixed to the outer circumferential surface of an aluminum disk using a truing tool embedded with diamond grains, an operator would use a rod-shaped abrasive wheel containing alumina grains. Dressing was done by pressing the torturing tool against the outer circumferential surface of the grinding wheel.

However, this method not only has extremely poor safety and work efficiency, but also has the disadvantage that the dressing tool is subject to severe wear and is uneconomical. The present invention has been made in order to eliminate such conventional drawbacks, and it is possible to dress the grinding wheel by arranging a backup plate to face the grinding wheel at an appropriate interval and supplying free particles for dressing between the two. This is a summary. An example of an apparatus for carrying out the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a grinding wheel in which abrasive grains of hard material such as cubic boron nitride are adhered to the outer peripheral surface of an aluminum disk in a layered manner, and is rotated at high speed clockwise in FIG. 1 to grind a workpiece.

On the other hand, the grinding wheel 1 is trued by a fixed amount using a truing tool (not shown) embedded with diamond grains each time the sharpness of the grinding wheel 1 decreases or for reshaping. Reference numeral 2 denotes a backup plate for dressing the trued grinding wheel 1, which is made of a material having a certain degree of hardness, toughness, and wear resistance, such as tempered steel or hardened steel.

The front surface of this backup plate 2 is formed into an arcuate concave surface that complements the outer circumferential surface of the grinding wheel 1, and forms a torturing process L of an appropriate length through which loose grains for tortsing, which will be described later, pass between it and the grinding wheel 1. are doing. Reference numeral 3 denotes a support for supporting the backup plate 2 facing the grinding wheel 1 with an appropriate distance between them, which is equal to or less than the outer diameter of the loose particles for dressing. It is mounted so that it can move forward and backward in the radial direction.

Next, every time the grinding wheel 1 is trued by a certain amount by the truing tool, the support body 3 is advanced by this certain amount to always maintain the above-mentioned distance between the backup plate 2 and the grinding wheel 1. 5 will be explained.

Reference numeral 6 denotes a feed screw shaft that is screwed into the support body 3, and is rotatably supported on the base 4.

A pinion 7 is freely rotatably supported on the feed screw shaft 6, and a pawl 9 pivotally supported on a rotary plate 8 fixed to the pinion 7 engages and disengages from a ratchet wheel 10 keyed to the feed screw shaft 6. They mesh freely. Therefore, when the pinion 7 is rotated by the forward and backward movement of the rack piston 12 based on the operation of the hydraulic cylinder 11, the feed screw shaft 6 is rotated in the forward direction via the pawl 9 and the ratchet wheel 10, and the support body 3 is advanced by the predetermined amount. will be moved. If the back-up plate is considerably worn during dressing, which will be described later, the amount of this wear is determined in advance by experiment, and the support 3 is advanced by an amount equal to the above-mentioned constant amount plus this amount of wear. The distance t is maintained. 13
is a nozzle for supplying dressing liquid between the grinding wheel 1 and the backup plate 2, and is connected via a pump p to a tank 14 in which dressing liquid is stored.

As an example, the dressing liquid is a grinding liquid 101 mixed with 500 g of free particles 15 for dressing (approximately 100 μm in diameter) such as alumina or silicon carbide. Reference numeral 16 denotes an agitating blade that prevents separation of the grinding fluid and the loose particles 15, and is rotationally driven by a motor 17.

Next, a specific embodiment of the present invention using the above device will be described.

When the grinding wheel 1 is trued by a certain amount by the truing tool, the hydraulic cylinder 11 is activated and the rack piston 12 is reciprocated, and the feed screw shaft 6 is rotated in the forward direction via the rack pinion and the ratchet mechanism to support the grinding wheel 1. The body 3 moves forward by the predetermined amount to maintain the distance t between the backup plate 2 and the grinding wheel 1. Rack piston 1
When the reciprocation of step 2 is completed, pump P is started and nozzle 1
3, dressing liquid is supplied between the grinding wheel 1 and the batter up plate 2, and the supplied dressing loose particles 15 are backed up by the backup plate 2 while passing through the dressing process L. The grinding wheel 1 is dressed by biting into the bond (metal or synthetic resin) holding the abrasive grains of the grinding wheel 1 and scraping it off, making the abrasive grains protrude from the bond. When it is desired to improve the surface accuracy of the ground surface ground by the dressed grinding wheel, the distance t is lengthened to reduce the amount of loose particles 15 biting into the bond, thereby improving the surface accuracy. When heavy grinding is desired to further improve the grinding efficiency, the distance t is shortened to increase the biting amount and the protrusion amount of the abrasive grains. In the above embodiment, the backup plate is made of steel, but if it is made of a synthetic resin with excellent strength and abrasion resistance, such as nylon or polyacetal, the loose granules for dressing is now embedded and held in the synthetic resin, allowing for effective dressing of the grinding wheel.

Further, the loose particles for dressing do not necessarily need to be supplied mixed with the grinding fluid, and only the loose particles may be supplied between the grinding wheel and the back amplifier plate using its own weight or compressed air. As described in detail above, the present invention has a method in which a back-up plate is opposed to a grinding wheel with an interval of an appropriate dimension equal to or less than the outer diameter of loose particles for dressing, and a back-up plate for dressing is placed between the grinding wheel and the back-up plate. Since loose grains are supplied to dress the grinding wheel, there is no need to rely on manual dressing for dressing, which greatly improves safety and work efficiency, reduces dressing costs, and reduces back-up. By simply changing the distance between the plate and the grinding wheel, the dressing state of the grinding wheel, that is, the amount of protrusion of the abrasive grains can be controlled.

[Brief explanation of drawings]

The drawing is a side view of an apparatus for carrying out the method of the invention. DESCRIPTION OF SYMBOLS 1... Grinding wheel, 2... Backup plate, 3... Support body, 5... Spacing maintenance device, 13... Nozzle , 15... Free granules for dressing.

Claims (1)

[Claims] 1. A method of dressing a grinding wheel using a hard material such as cubic boron nitride as abrasive grains, and a backup plate is opposed to the grinding wheel with an interval of an appropriate dimension equal to or less than the outer diameter dimension of the loose particles for dressing. . A method for dressing a grinding wheel, characterized in that the loose particles for dressing are supplied between the grinding wheel and a backup plate.