JPH0549254U - Contact discharge dressing device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to eliminate clogging when dressing a grindstone for the first time and to shorten the dressing time. [Structure] Two electrodes to which a voltage is applied are arranged in parallel in the radial direction of a metal bond grindstone, respectively.
The taper shape is such that the thickness decreases toward the metal bond grindstone.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a contact discharge dressing device for a metal bond grindstone.

[0002]

[Prior Art]

 In the contact discharge dressing device, a voltage is applied to two thin plate electrodes arranged in parallel in the radial direction of the metal bond grindstone, and chips generated by grinding the electrode with the metal bond grindstone. However, when the bond portion of the metal bond grindstone after truing approaches or decomposes by contact, the metal of the bond portion is melted and evaporated to form a chip pocket in the bond portion.

As shown in FIG. 2, in the metal bond grindstone at the beginning of use, the surface of the metal bond grindstone immediately after truing has a protrusion amount (see FIG. 3) which is a distance from the tip of the abrasive grain 1a to the bond 1b. Since it does not exist, the load applied when the metal bond grindstone grinds the electrode is large, and clogging easily occurs. For this reason, in the past, the grinding efficiency was lowered and the contact discharge dressing work was performed, and a cycle was set up to increase the grinding efficiency as the protruding amount gradually increased.

[0004]

[Problems to be solved by the device]

 As mentioned above, when the contact discharge dressing work of the metal-bonded grindstone which is first used, the dressing time is long because the grinding efficiency is lowered.

[0005]

[Means for Solving the Problems]

 The present invention was made in order to solve the above-mentioned problem, and two electrodes to which a voltage is applied are arranged in parallel in the radial direction of the metal bond grindstone to the metal bond grindstone respectively. The feature is that it has a tapered shape in which the thickness decreases toward the end.

[0006]

[Action]

 In the electric discharge dressing of the metal bond grindstone, which was first used, the electrode had a tapered shape in which the thickness decreased toward the metal bond grindstone, so that the surface of the metal bond grindstone with almost no protrusion immediately after truing (Fig. 2 In addition, the load applied when grinding the electrode can be reduced, and clogging can be eliminated.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the contact discharge dressing device 21 includes a tapered electrode 22 whose thickness decreases toward the metal bond grindstone 1. A tapered shape is created by inclining the tip side surface of the electrode 22 at an arbitrary angle. The metal bond grindstone 1 is trued at the beginning of use, and the grindstone surface is as shown in FIG. is there.

The pair of electrodes 22 are arranged in parallel in the radial direction of the metal bond grindstone 1, and a voltage is applied by a power supply 26. The pair of electrodes 22 are fixed by an insulating plate 23. The screw shaft 25 is screwed from the side surface of the support base 24 and is fixed by pushing the insulating plate 23 against the other side surface of the support base 24. The operation of the contact discharge dressing device configured as described above will be described.

When chips generated by grinding the electrode 22 on the outer peripheral surface of the metal bond grindstone 1 come close to or contact-decompose with the bond portion 1 b of the metal bond grindstone 1, a discharge is generated between the electrode 22 and the discharge. An electric current flows through the chips, the portion A of the bond portion 1b is melted and vaporized and removed, and the abrasive grains 1a are projected to restore the sharpness of the grindstone 1. The electrode for contact discharge dressing of the present invention is used for dressing when the grinding wheel surface after truing is in a state as shown in FIG. Since the electrode is scraped off by a few mm in one dressing, the thickness of the electrode taper part changes when it is used after the second time.

However, at the time of the second dressing, since larger irregularities are formed on the surface of the grindstone as compared with the first time, it is desirable that the thickness of the electrode 22 be larger than that at the first time. Since the thickness of the electrode 22 is increased, larger chips are generated during dressing compared with the first time, so that the dressing efficiency can be increased. The same is true when comparing the second dressing and the third dressing. The electrode 22 is used for one grindstone 1, and when the grindstone 1 is replaced with a new grindstone 1, the electrode 22 is also replaced.

[0011]

[Effect of the device]

 As described above, according to the present invention, since the pair of electrodes are tapered so that the thickness decreases toward the metal bond grindstone, it is necessary to grind the electrodes on the surface of the metal bond grindstone that has been trued before use. The load can be reduced and clogging can be eliminated. As a result, it is not necessary to reduce the feed rate when a metal-bonded grindstone with no protrusion on the surface is used to grind the electrode, and the dressing time of the metal-bonded grindstone can be shortened.

[0012] Because unevenness is formed on the surface of the grindstone before the second dressing, the grindstone is not clogged during dressing even if the electrode thickness is large. There is no. Moreover, since the thickness of the electrode is increased, larger chips are generated during dressing compared with the first time, and thus dressing efficiency can be increased.

[Brief description of drawings]

FIG. 1 shows a contact discharge dressing device according to an embodiment of the present invention.

FIG. 2 shows an enlarged cross-sectional view of the surface of the metal bond grindstone in FIG. 1 immediately after truing.

3 shows an enlarged cross-sectional view of the surface of the metal bond grindstone in FIG. 1 after dressing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal bond grindstone 21 Contact discharge dressing device 22 Electrode 23 Insulation plate 24 Support stand 25 Screw shaft 26 Power supply

Claims (1)

[Scope of utility model registration request] 1. A pair of electrodes, which are arranged in parallel in a radial direction of a metal bond grindstone and to which a voltage is applied,
In the contact discharge dressing device, which grinds with the metal bond grindstone, generates an electric discharge between the chips generated at this time and the electrode, and removes the bond, the thickness of the electrode toward the metal bond grindstone is increased. A contact discharge dressing device characterized by a tapering shape that decreases.