JP2000301466A - Grinding wheel for vertical line grinding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily carry out an exchange of a grinding wheel and an adjustment of a projection amount. SOLUTION: Grinding wheel holders 27 are installed on a plurality of concave grooves 22 provided on an upper surface of a body 21 of a grinding wheel flange 20. A super abrasive grain grinding wheel in which a super abrasive grain is dispersed in a metal bonding phase is engaged and fixed to an upper hole of through holes arranged in a ring shape of a grinding wheel holder 27. A shaft portion of the grinding wheel holder 27 is inserted to a concave groove 22 and an annular concave groove is urged and fixed by a push screw. If the push screw is loosened, the grinding wheel holder 27 is attachably/detachably exchangeable and the grinding wheel 27 is projected by pushing an adjustment screw. Thereby, a projection amount of the super abrasive grain grinding stone 37 can be adjusted. A metal bonding phase of the super abrasive grain grinding wheel 37 by dispersing a deposited particle comprising an intermetallic compound in an organ thereof can be destroyed at a micron unit to enhance an autogenous edge-generation effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical grinding wheel used for grinding various workpieces such as steel for molds.

[0002]

2. Description of the Related Art Conventionally, when a surface is ground using a flat grindstone, for example, using steel for a mold or the like as a work material by a horizontal axis surface grinder, conventionally, for example, as shown in FIG. That is, the annular grindstone 1 is arranged such that a rotation axis (not shown) coaxial with the center line O is parallel to the grinding surface 2a of the work material 2, and the outer periphery of the grindstone 1 rotating around the rotation axis. Arrow E on surface 1a
Grinding surface 2a of work material 2 sent in the direction is subjected to surface grinding. In the case of horizontal axis surface grinding, since the outer peripheral surface 1a of the grindstone 1 comes into line contact in a direction substantially orthogonal to the feed direction of the work material 2, scratches on the grinding surface 2a during grinding occur in one direction. As a result, there is an advantage that the grinding accuracy of the processing surface 2a is good and the vibration during grinding is small. However, in the horizontal axis surface grinding, since the grinding wheel 1 and the work material 2 are in line contact, there is a disadvantage that the grinding area is small and a large amount of grinding cannot be efficiently performed.

On the other hand, in vertical axis surface grinding,
As shown in FIG. 7, the rotating shaft 5 of the longitudinal plane grinding machine provided on the base 4 supporting the substantially cylindrical grindstone 3 is positioned in a direction substantially orthogonal to the grinding surface 2a of the work material 2. The grinding surface 2a of the workpiece 2 is ground while the annular tip surface 3a of the grindstone 3 rotates along with the rotation of the rotating shaft 5. In the case of the vertical axis surface grinding, since the tip end surface 3a of the grindstone 3 comes into surface contact with the ground surface 2a of the workpiece 2, the machining amount per unit time is larger than that of the horizontal axis surface grinding. Although a large amount of processing can be performed, there is a disadvantage that the grinding resistance is large, the vibration and heat generation during the grinding are large, the abrasive grains are easy to fall off, and the grinding wheel 3 is greatly damaged, so that the life of the grinding wheel 3 is extremely short. is there. In addition, there is a disadvantage that a mesh-like scratch is generated on the ground surface 2a during grinding, and the appearance of the processed surface is poor.

[0004] An example of the grinding of, for example, die steel using such a grindstone for vertical axis surface grinding will be described below.
Generally, a general abrasive wheel (hereinafter, referred to as a general wheel) is used for vertical surface grinding of mold steel. For example, as shown in FIG. 8, a plurality of recesses are formed on the surface 7a of a disk-shaped stage 7 for supporting a work material along its peripheral surface, and die steel 8 is mounted in each recess. Are arranged in a ring shape. The base metal 10A of the grindstone flange 10 for grinding the die steel 8 on the stage 7 has, for example, a substantially disk shape, and its outer peripheral surface 10a has a substantially square cross section at a predetermined interval as shown in FIG. Are cut in the center direction to form storage recesses 11. Each storage recess 11 is formed in a substantially quadrangular prism shape having an opening on the outer peripheral side. A rectangular column-shaped grindstone 12 having a substantially quadrangular prism shape as shown in FIG. 10 is fitted into each of the storage recesses 11, and a belt 13 is mounted on an outer peripheral surface 10 a of the grinding stone flange 10. Belt 13 is attached to convex portion 14 located between
By screwing the bolts 15 through the holes, the square-column grindstones 12 are respectively fixed in the storage recesses 11.

When the die steel 8 on the stage 7 is subjected to surface grinding using such a grinding wheel flange 10, as shown in FIG. 8, the stage 7 is rotated about its center as a rotation axis, for example, in the direction of an arrow F. In this state, the grindstone flange 10 is arranged at a position eccentric with respect to the stage 7 and is rotated in the direction of arrow G, so that the tip surface 12a of the square pillar grindstone 12 protruding from the surface of the grindstone flange 10 is 8 is to be ground. In this case, the square column grinding wheel 12
Since the tip surface 12a of the mold steel 8 and the surface of the mold steel 8 are in surface contact with each other, the mold steel 8 can be efficiently and massively ground.
FIG. 11 shows an example of the same kind of grindstone flange 16. The whetstone flange 16 has a rectangular column-shaped storage recess 11.
Instead of this, a storage recess 17 having a substantially triangular prism shape with a substantially triangular cross section is formed, and a triangular prism grindstone 18 having a substantially triangular prism shape is mounted in the storage recess 17 and fixed with a belt 13 and bolts 15. Have.

By the way, the quadrangular column grindstone 12 and the triangular column grindstone 1 of the grindstone flanges 10 and 16 used for such vertical axis grinding are used.
In No. 8, general abrasive grains such as Al ₂ O ₃ , SiC and GC are used, and a glassy bond usually called a vitrified bond is used as a binder phase. Vitrified bond grindstones have good wettability with abrasive grains, but have the disadvantage that they are weak to impact and wear of the grindstones increases with the progress of grinding. Therefore, grinding was performed while giving an impact to the grindstone in order to promote the self-generated blade action. In the case of horizontal axis grinding, since the grinding wheel 1 and the work material 2 are in line contact, the stress generated during the grinding is as shown in FIG. 6 from the contact point between the grinding wheel 1 and the work material 2 in the radial direction of the grinding wheel 1, Only in the direction S1 perpendicular to the surface 2a of the work material 2, but in the case of vertical axis grinding, as shown in FIG.
Is generated in a direction S1 perpendicular to the surface 2a and a direction S2 parallel to the surface 2a, so that the force applied to the abrasive grains of the grindstones 12 and 18 is about twice that in the case of the horizontal axis grinding.

In this case, when super-abrasive grains such as diamond and CBN having a large grinding force are used as the abrasive grains, the amount of chips generated is further increased. There is a disadvantage that the life is further shortened. In this regard, since the general abrasive has a smaller grinding amount than the superabrasive, a general grindstone is usually used as a grindstone for vertical grinding in order to secure the durability of the grindstone. still,
If a metal bond whetstone is used instead of a vitrified bond whetstone as a grinding wheel for vertical axis grinding, even if a superabrasive is used instead of a general abrasive as an abrasive, the wear resistance and rigidity of the metal bonding phase are high. Even if the amount of chips increases due to an increase in the amount of grinding, the wear of the metal bonding phase can be suppressed. However, for example, when the work material is a hard and brittle material such as mold steel 8, the metal bonding phase is hard. In addition, as the abrasive grains wear, the metal binder phase recedes, and the so-called autogenous cutting action of maintaining the projection amount of the abrasive grains at or above a certain level is poor, so that the sharpness deteriorates relatively early and the grinding accuracy deteriorates. Therefore, super-abrasive grains cannot be used as abrasive grains for vertical axis grinding, and metal bond grindstones cannot be used. Therefore, the above-mentioned disadvantage that the life of the grindstone is short cannot be improved.

[0008]

By the way, the die steel 8 was ground by using a vitrified bond grindstone in which general abrasive grains are dispersed in a square pole grindstone 12 or a triangular prism grindstone 18 used for the above-mentioned grindstone flanges 10 and 16. In case, whetstone 12,
18 wears out in a short period of time.
It was necessary to adjust the amount of protrusion of 2, 18 and replace the grindstone, which was extremely complicated and poor in productivity. When adjusting the protrusion amount or replacing the grindstone, the bolt 15 is removed, the belt 13 is removed, and the grindstone 1 attached to the storage recesses 11 and 17 is removed.
Even if the protrusion amounts are adjusted by shifting the positions of the protrusions 2 and 18, it is not possible to accurately adjust the protrusion amount, and the grinding wheels 12 and 18 must be completely replaced.
In view of such circumstances, an object of the present invention is to provide a grindstone for vertical axis grinding that allows easy and easy replacement of the grindstone.
Another object of the present invention is to provide a grindstone for vertical axis grinding in which the amount of protrusion of the grindstone can be easily adjusted.

[0009]

A vertical grinding wheel according to the present invention has a plurality of grinding wheel holders each having a grinding wheel attached thereto, each of which is mounted on a grinding wheel flange by a fixing member. It is characterized by being individually replaceable. The grindstone holder is a part type and can be attached to and detached from the grindstone flange separately.If the grindstone is worn or you want to use a grindstone with a different particle size, concentration or binder depending on the purpose of grinding In order to replace the individual grinding wheel holders, it is necessary to replace the grinding wheel holder with the grinding wheel with another grinding wheel holder equipped with a grinding wheel according to the required grain size, concentration, binder, etc. Work can be performed easily and quickly. The shaft portion of the grindstone holder may be mounted on the concave portion of the grindstone flange, and the shaft portion may be fixed by a fixing member mounted on the main body.

[0010] In the grinding wheel for longitudinal axis according to the present invention, a plurality of whetstone holders each having a whetstone attached thereto are mounted on a whetstone flange, and a position adjusting member is provided on the whetstone flange. Thus, the amount of protrusion of the grindstone holder with respect to the grindstone flange can be adjusted. When adjusting the protrusion amount of the superabrasive grindstone attached to the grindstone holder, the protrusion amount can be easily and easily adjusted by moving the grindstone holder with the position adjusting member, and the accurate protrusion amount can be adjusted.

[0011] The grindstone may be configured such that superabrasive grains are dispersed in a metal binding phase, and precipitate particles composed of an intermetallic compound are dispersed in the structure of the metal binding phase. By the precipitate particles being dispersed and generated in the metal binder phase,
The overall wear resistance and stiffness of the metal binder phase is kept high, and wasteful wear and shape deformation of the grindstone are reduced. Nevertheless, on the surface of the metal bonded phase, microscopic disintegration in units of precipitate particles is likely to occur, and the metal bonded phase will be disintegrated at an appropriate speed with abrasive wear, Since the spontaneous cutting action of the abrasive grains is improved, it is possible to obtain good sharpness over a long period of time as compared with a conventional metal-bonded grindstone, and high grinding accuracy is obtained. Although the durability is shorter than that of a conventional metal bond grinding wheel, the durability is higher than that of a vitrified bond grinding wheel. Further, the work material is less likely to be welded to the grindstone grinding surface during grinding, so that clogging due to welding can be reduced, and from this point, an effect of maintaining good sharpness can be obtained.

The grindstone according to the present invention is a metal bond grindstone in which superabrasive grains such as diamond or CBN are dispersed in a metal binder phase, and the metal binder phase is composed of Sn, Z
One or more low melting point metals A selected from n and Al in total of 20 to 25 wt%, and one or two IVb group elements B selected from Si or Ge in total of 1 to 2 wt%.
6% by weight, 0 to 15% by weight of Ag and Cu, W, F
e, one or two or more kinds of refractory metals C selected from Ni, Co, respectively, and the structure thereof contains a metal having a high melting point metal C and a low melting point metal A as main constituent elements. Precipitate particles made of a compound may be dispersed. Another configuration of the superabrasive grindstone according to the present invention is a metal bond grindstone in which superabrasive grains such as diamond or CBN are dispersed in a metal binder phase, wherein the metal binder phase contains Sn in an amount of 20 to 25 wt. %, Ge 1-6 w
Precipitate particles composed of an intermetallic compound containing t%, Ag of 0 to 15 wt%, and the balance of Cu, respectively, and Cu and Sn as main constituent elements may be dispersed in the structure.

The intermetallic compound may be Cu ₄ Sn. The Ag content (wt%) of the metal binding phase is G
It may be 3 to 5 times the e content (wt%). As for the content of the precipitate particles in the metal bonding phase, the area ratio of the precipitate particles on the cut surface of the abrasive grain layer is preferably 5 to 15%. If it is less than 5%, the effect cannot be obtained, and if it is more than 15%, the metal binding phase becomes too hard, and the spontaneous cutting action decreases.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a plan view of a grinding wheel flange according to an embodiment, FIG. 2 is a central longitudinal sectional view of the grinding wheel flange shown in FIG. 1, FIG. 3 is an enlarged view of a grinding wheel holder part of the grinding wheel flange shown in FIG. 2, and FIG. Side view of holder, FIG.
(A) is a longitudinal sectional view of a part-type grindstone mounted on a grindstone holder, (b) is a corner sectional view of an abrasive grain layer of the part-type grindstone,
(C) is sectional drawing which shows the modification of the corner part of an abrasive grain layer. The grinding wheel flange 20 shown in FIGS. 1 to 3 is mounted on a longitudinal plane grinding machine (not shown), and a main body 21 of the grinding wheel flange 20 is formed in a substantially rectangular shape in a longitudinal cross section and has a predetermined interval in the circumferential direction. A plurality (12 in FIG. 1) of substantially cylindrical concave grooves 22 are formed. The center line O of the ring-shaped main body 21 is adapted to be rotatable around the center line O in accordance with the rotation axis of the vertical plane grinding machine described above. The concave groove 22 of the main body 21 is opened on the upper surface 21a, and a screw hole 23 communicating with the bottom surface 22a of the concave groove 22 is formed on a lower surface 21b facing the upper surface 21a. An adjustment screw 24 on the head is screwed forward and backward as a position adjustment member. A fixing screw hole 25 communicating with the outer peripheral surface 21c of the main body 21 is provided on a side surface of the groove 22.
A plurality of holes (two in the figure) are perforated along the depth direction of the concave groove 22, but may be one.

A grindstone holder 27 shown in FIG. 4 is detachably mounted in each groove 22 of the main body 21. In FIG. 2, one of the grindstone holders 27 is omitted. The grindstone holder 27 includes a shaft portion 28 that is inserted into the groove 22 and a disk-shaped flange portion 29 that is enlarged in diameter with respect to the shaft portion 28 and that is seated on the upper surface 21a. In the figure, one or more (two in the figure) concave ring grooves 30 are formed over the entire circumference, and the plural concave ring grooves 30 are arranged to be shifted in the length direction of the shaft portion 28. . With the shaft portion 28 of the grindstone holder 27 fitted in the concave groove 22, the concave ring groove 30
Are positioned so as to face the fixing screw holes 25, 25, respectively. An insertion hole 31 is formed in the center of the flange portion 29 of the grindstone holder 27 and communicates coaxially with a screw hole 32 formed in the upper end of the shaft portion 28. The fastening bolt 33 is screwed into the screw hole 32 of the shaft portion 28 through the insertion hole 31 in a state where the shaft portion 28 is fitted, so that the shaft portion 28 and the flange portion 2
Although 9 is connected, both may be formed integrally.

With the shaft portion 28 of the grindstone holder 27 fitted in the concave groove 22 of the main body 21, the outer peripheral surface 21c of the main body 21 is
By screwing a headless push screw 26 as a fixing member into the fixing screw hole 25 and pressing the concave ring groove 30 of the shaft portion 28 at the tip end, the grindstone holder 27 is firmly fixed to the main body 21. . The outer diameter of the tip of the push screw 26 is set to be smaller than the width of the concave ring groove 30, and even if the shaft portion 28 is adjusted in its length direction, the concave ring groove 30 by the push screw 26 is used.
Is securely fixed. It is to be noted that if fine irregularities are formed at the tip of the push screw 26, the fixing of the shaft portion 28 becomes more reliable. An appropriate number (six in the figure) of through-holes 35 are formed at predetermined intervals around the center insertion hole 31 in the flange portion 29. Each of the through-holes 35 is an insertion portion having a small inner diameter formed therein. The upper hole 35a is divided into an upper hole 35a and a lower hole 35b at a boundary of the superabrasive grinding stone 3 shown in FIG.
7, a fixing bolt 38 having a head is inserted into the prepared hole 35b to fix the superabrasive grindstone 37 through the insertion portion 36. The superabrasive grindstone 37 is a metal bond grindstone, and includes a base 39 and an abrasive layer 40 as shown in FIG. 5, and a screw hole 42 for screwing with a fixing bolt 38 is formed on the bottom surface of the base 39. The upper portion of the base 39 is enlarged in diameter, and an abrasive layer 40 is mounted on the upper surface 39a. FIG. 5B shows a corner portion of the processing surface of the tip of the abrasive layer 40.
Is chamfered over the entire circumference. Alternatively, as shown in FIG.
A flat chamfer J at 5 ° may be formed. By forming such chamfered portions R and J, the corner of the work does not sag and chipping of the abrasive layer 40 can be prevented, so that the surface roughness of the work surface and the dimensional accuracy can be improved. .

The abrasive layer 40 of the superabrasive grindstone 37 is composed of superabrasives such as diamond or CBN dispersed in a metal binder phase, and the metal binder phase has the following composition. . That is, the metal binding phase contains one or more low melting point metals A selected from Sn, Zn, and Al in a total amount of 20 to
25 wt%, 1-6 wt% of one or two IVb group elements B selected from Si or Ge in total, and 0 wt% of Ag
-15 wt% and one or two or more refractory metals C selected from Cu, W, Fe, Ni, Co, respectively, and the structure thereof contains a high melting point metal C and a low melting point metal A. The precipitate particles composed of an intermetallic compound having as a main constituent element are dispersed.

The low melting point metal A is added to enhance the sinterability of the metal binding phase and to form an intermetallic compound. When the content is less than 20 wt%,
Intermetallic compounds cannot be generated sufficiently,
It is difficult to obtain the effect. On the other hand, if the content is more than 25 wt%, the metal binder phase becomes too soft, so that the wear resistance and the rigidity cannot be sufficiently increased, and the desired effect of improving the durability cannot be obtained. As the kind of the low melting point metal A, any of the above elements or a combination of any of the above elements can be used to obtain the effect, but it is particularly preferable to use Sn as the main composition from the viewpoint of cost. The effect of group IVb element B represented by Ge is that, when the amount of addition increases, the amount of intermetallic compound increases and the viscosity decreases, so that chips are less likely to be welded and clogging of the grindstone and increase in grinding resistance occur. The effect of preventing sharpness and improving sharpness is obtained. Although it is not clear, it is considered that it may become a part of the constituent elements of the intermetallic compound or act as a catalyst when generating the intermetallic compound. On the other hand, if the addition amount is too large, the metal binder phase becomes too brittle, so that sufficient strength cannot be obtained and the whetstone tends to be easily broken at the time of sintering. Therefore, 1 to 6 wt% is suitable. As the type of the IVb group element B, any of the above elements or a combination of any of the above elements can obtain the above-described effects. In particular, Ge is used as the main composition in view of the effects. preferable. Ag has an effect of preventing embrittlement of the metal bonding phase and cracking of the grindstone at the time of sintering due to the addition of the IVb group element B such as Ge. The addition is not necessarily required if cracking of the grindstone can be prevented by setting the sintering conditions and the like. However, when the content of the IVb group element B is relatively large, it is better to add in the range of 15 wt% or less. . When the amount of Ag exceeds 15 wt%, the strength of the metal binding phase increases, but the grinding resistance increases, and the sharpness of the grindstone decreases.

The refractory metal C defines the mechanical properties that serve as the base of the metal binder phase, and its content is 54 wt.
%, The wear resistance and rigidity of the metal binding phase cannot be sufficiently increased, and the desired effect cannot be obtained. On the other hand, if the content of the high melting point metal C is more than 80% by weight, it is impossible to promote the spontaneous cutting action. As the type of the high melting point metal C, any of the above elements or a combination of any of the above elements can be used to obtain the effect, but it is particularly preferable to use Cu as the main composition.

Although the composition of the intermetallic compound constituting the precipitate particles is not clear at present, it is presumed that the precipitate particles mainly composed of Cu ₄ Sn or the like contribute to the effect of the present invention. You. The content of the precipitate particles in the metal binding phase,
The area ratio of the precipitate particles on the cut surface of the abrasive layer is 5 to 15
%. If it is less than 5%, the effect cannot be obtained, and if it is more than 15%, the metal binding phase becomes too hard, and the spontaneous cutting action decreases.

By forming the above-mentioned precipitate particles in a dispersed state in the metal binder phase, the wear resistance and rigidity of the metal binder phase as a whole are kept high, and unnecessary wear and shape deformation of the grinding wheel are reduced. It is possible to obtain a high grinding accuracy and durability compared to the conventional vitrified bond grinding wheel. Nevertheless, on the surface of the metal bonding phase, microscopic collapse in units of precipitate particles is likely to occur,
The metal binder phase starts to collapse at an appropriate speed with the wear of the abrasive grains, and the spontaneous cutting action of the abrasive grains is improved. Good sharpness can be obtained. In addition, there is an advantage that dressing (dressing) using a dresser becomes easy because the metal binder phase has a tendency to collapse microscopically. Further, the work material is less likely to be welded to the grindstone grinding surface during grinding, so that clogging due to welding can be reduced, and from this point, an effect of maintaining good sharpness can be obtained. The metal bonding phase may contain some unavoidable impurities, or may contain additional elements, various fillers, and the like well-known in the field of this type of metal bond grinding wheel.

Next, the flange portion 2 of each grindstone holder 27
9, a plurality of through holes 35 are formed around the fastening bolts 33, for example, as shown in FIG. A superabrasive grindstone 37 is fitted into each of the upper holes 35a and fixed with fixing bolts 38 from the lower hole 35b side. The reason why the superabrasive grindstones 37 are mounted only in the three upper holes 35a on the outer peripheral side and arranged in a substantially arc shape is that the edge of the work material drops when the grinding wheel flange 20 performs vertical plane grinding. When the superabrasive grindstones 37 are attached to all the six upper holes 35a, the superabrasive grindstones 37 are attached to the respective grindstone holders 2.
In FIG. 7, since the workpiece is arranged in a ring shape, when the workpiece is started to be ground at the time of vertical axis surface grinding and when the workpiece comes off from the workpiece, the edge becomes dull.

Since the grinding wheel for vertical axis surface grinding according to the present embodiment is configured as described above, the amount of projection of the superabrasive grinding wheel 37 with respect to the upper surface 21a of the main body 21 of the grinding wheel flange 20 prior to the vertical axis surface grinding. Set. For this purpose, first, when the shaft portion 28 of the grindstone holder 27 is mounted in the concave groove 22 and placed on the upper end of the adjusting screw 24, the shaft portion 28 is mounted on the lower surface 21b before being fixed by the push screw 26. By moving the adjusting screw 24 forward and backward, the grindstone holder 37 is linked, and the amount of protrusion of the grindstone holder 37 with respect to the main body 21 is adjusted. Then, by tightening the set screw 26 screwed into the fixing screw hole 25 from the outer peripheral surface 21c of the main body 21,
The concave ring groove 30 of the shaft 28 is pressed and fixed by the tip of the push screw 26, and the grindstone holder 27 is positioned and fixed to the main body 21. The grinding wheel flange 20 in which the protruding amount of the superabrasive grindstone 37 is adjusted is mounted on a vertical plane grinding machine (not shown), and the upper surface 21a of the main body 21 is mounted on a base on which the die steel 8 shown in FIG. In a state where the grinding wheel flange 20 is eccentric with respect to the base 7 so as to face the surface 7a of the base 7, the two are rotated, for example, in opposite directions to perform surface grinding.

At this time, since the super-abrasive grains are provided on the super-abrasive grindstone 37, the stress applied to the super-abrasive grains at the time of grinding occurs in a direction parallel to the upper surface of the mold steel 8 and a direction perpendicular thereto. The resulting stress on the superabrasive grains is about twice that in the case of horizontal axis surface grinding, the grinding amount is large, and the amount of chips generated is also about twice as large. However, since the superabrasive grindstone 37 is a metal bond grindstone, the abrasive grain holding power, abrasion resistance and rigidity are high as compared with the vitrified bond grindstone, and the chipping of the metal bonding phase by chips is suppressed, and The durability increases. Moreover, since the above-mentioned precipitate particles are dispersed and generated in the metal binding phase of the superabrasive grindstone 37, the wear resistance and rigidity of the metal binding phase as a whole are kept high, and the grinding stone 37 is maintained. Useless wear and shape change are suppressed to a small degree, and higher grinding accuracy can be obtained as compared with a conventional vitrified bond grinding wheel. In addition, microscopic disintegration in units of precipitate particles is likely to occur on the surface of the metal binder phase, and the metal binder phase collapses at an appropriate speed along with the wear of the abrasive grains, and the abrasive grains Since the self-generated blade action is improved, it is possible to obtain a good sharpness over a long period of time as compared with a conventional metal bond grindstone.

When the superabrasive grindstone 37 mounted on the grindstone holder 27 performs a self-generated blade action as the grinding proceeds, if the amount of protrusion of the superabrasive grindstone 37 with respect to the upper surface 21a of the main body becomes small, the amount of protrusion is increased. Adjustment is required.
In this case, the adjustment screw 24 mounted on the lower surface 21b is screwed in a state where the push screw 26 of the main body 21 is loosened, so that the protrusion amount of the grindstone holder 27 with respect to the main body upper surface 21a can be increased and readjusted. Also a whetstone holder 2
It is necessary to vary the abrasive grain size, concentration (concentration), binder, etc. of the superabrasive grindstone 37 depending on the use or purpose such as rough grinding and finish grinding performed by the method 7. In this case as well, if the headless screw 26 is loosened, the grindstone holder 27 can be removed from the recess 22. If the grindstone holder 27 is replaced and mounted, the appropriate abrasive grain size and concentration (concentration ), A grindstone holder 27 having a superabrasive grindstone 37 provided with a binder or the like can be mounted. Instead of replacing the grindstone holder 27, only the superabrasive grindstone 37 mounted on the grindstone holder 27 may be replaced by operating the fixing bolt 38.

As described above, according to the grinding wheel for longitudinal axis surface grinding according to the present embodiment, the grinding wheel holder 27 having a plurality of superabrasive grain grinding wheels 37 used for longitudinal axis surface grinding is made into parts, and the set screw 26 is used. Since it is detachable and replaceable, it can be quickly and easily replaced with another different super-abrasive grindstone 37 such as abrasive grain size, concentration, binder, etc. according to the wear of the superabrasive grindstone 37 or a change in the purpose of grinding. In addition, the height of the superabrasive grindstone 37 with respect to the main body 21 can be easily adjusted by operating the adjusting screw 24.

In addition, as the superabrasive grindstone 37, a metal bond grindstone in which superabrasive grains are dispersed is employed, and since the precipitate particles composed of the intermetallic compound are dispersed in the structure of the metal bonding phase, the abrasive grains of the superabrasive grains are dispersed. The spontaneous cutting action is improved, and good sharpness can be obtained over a long period of time as compared with a conventional metal-bonded grindstone. Another advantage is that dressing (dressing) using a dresser is facilitated. Furthermore,
Since the work material is less likely to be welded during grinding, clogging due to welding can be reduced, and from this point, an effect of maintaining good sharpness can be obtained. In addition, wear resistance and rigidity are maintained higher than vitrified bond wheels, and the metal bond phase is more likely to collapse than conventional metal bond wheels, but the durability is lower than vitrified bond wheels, although the durability is lower. There is.

The positions of the fixing screw holes 25 and the set screws 26 in the main body 21 are set in the direction in which the superabrasive grindstones 37 bite into the work material in the main body 21 which rotates during the rotational grinding by the grindstone flange 20. On the other hand, it is preferable to form on the side receiving the stress.

[0029]

As described above, the grindstone for vertical axis grinding according to the present invention has a plurality of grindstone holders each having a grindstone mounted on the grindstone flange by a fixing member, and the grindstone is operated by operating the fixing member. Since the holder can be replaced individually, the grinding wheel holder is a part type, and the grinding wheel is worn or you want to use a different grinding wheel with a different grain size, concentration, binder, etc. according to the grinding purpose In order to replace the grinding wheel holder including the grinding wheel, simply replace the entire grinding wheel holder with another grinding wheel holder equipped with a grinding wheel according to the required grain size, concentration, binder, etc. It can be done easily and quickly.

Further, in the grinding wheel for vertical axis grinding according to the present invention, a plurality of grinding wheel holders each having a grinding wheel attached thereto are respectively mounted on a grinding wheel flange, and a position adjusting member is provided on the grinding wheel flange. The protrusion amount of the grindstone holder with respect to the grindstone flange can be adjusted, so that the protrusion amount of the grindstone can be easily and easily adjusted by moving the grindstone holder with the position adjusting member. In addition, since the grindstone has super-abrasive grains dispersed in a metal binding phase, and precipitate particles composed of an intermetallic compound are dispersed in the structure of the metal binding phase, the precipitate particles are dispersed in the metal binding phase. By forming and dispersing in the metal binder phase, the overall wear resistance and rigidity of the metal binder phase are kept high, and unnecessary wear and shape deformation of the grinding wheel are reduced, and at the same time, precipitate particles are formed on the surface of the metal binder phase. Compared to conventional metal-bonded whetstones, because the micro-scale disintegration in units of grit tends to occur, and the metal binder phase collapses with the wear of the abrasive grains and the spontaneous cutting action of the abrasive grains improves. As a result, good sharpness can be obtained over a long period of time, and high grinding accuracy can be obtained. Although the durability is shorter than that of a conventional metal bond grinding wheel, the durability is higher than that of a vitrified bond grinding wheel.

[Brief description of the drawings]

FIG. 1 is a plan view of a grinding wheel flange in a vertical surface grinding wheel according to an embodiment of the present invention.

FIG. 2 is a central longitudinal sectional view of the grinding wheel flange shown in FIG.

FIG. 3 is an enlarged sectional view showing a grindstone holder portion of the grindstone flange main body shown in FIG. 2;

FIG. 4 is a side view of the grindstone holder shown in FIG. 2;

5A is a longitudinal sectional view of a superabrasive grain mounted on a grindstone holder, FIG. 5B is a sectional view of a corner portion of an abrasive layer of a part-type grindstone, and FIG. It is sectional drawing which shows the modification of.

FIG. 6 is a schematic explanatory view of a general horizontal axis surface grinding wheel.

FIG. 7 is a schematic explanatory view of a general grinding wheel for vertical axis surface grinding.

FIG. 8 is a plan view showing a grinding state of a mold steel by a vertical axis surface grinding wheel.

9 is a partial perspective view showing a state in which a general grindstone is mounted on an outer peripheral surface of a base metal of the grindstone for vertical axis surface grinding shown in FIG.

10 is a perspective view of a general grindstone mounted on the vertical-axis surface grinding grindstone shown in FIG. 9;

FIG. 11 is a partial perspective view showing a grinding wheel for vertical surface grinding on which a general grinding wheel having a shape different from that of FIG. 9 is mounted.

FIG. 12 is a perspective view of a general grindstone mounted on the vertical-axis surface grinding grindstone shown in FIG. 11;

[Explanation of symbols]

 Reference Signs List 20 grinding wheel flange 24 adjustment screw 26 push screw 27 grinding wheel holder 37 superabrasive grinding wheel 40 abrasive layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Haruo Murata 1-1 Higashihama, Ichikawa-shi, Chiba Japan High Frequency Steel Industry Inside Ichikawa Plant Co., Ltd. (72) Inventor Shigeru Kudo 1-1 Higashihama, Ichikawa-shi, Chiba Prefecture Japan High Frequency Steel Industry F-term in Ichikawa Plant Co., Ltd. (reference) 3C063 AA02 AB02 AB05 BB02 BB03 BC02 BC05 BD01 BG03 BG07 FF22

Claims (3)

[Claims] 1. A grindstone for longitudinal grinding in which a plurality of grindstone holders each having a grindstone attached thereto are fixed to a grindstone flange by a fixing member, and the grindstone holders can be individually exchanged by operating the fixing member. 2. A plurality of grindstone holders each having a grindstone attached thereto are mounted on a grindstone flange, respectively, and a position adjusting member is provided on the grindstone flange. The position adjusting member causes the grindstone holder to protrude from the grindstone flange. A grinding wheel for vertical axis grinding, characterized in that the amount can be adjusted. 3. The grinding wheel according to claim 1, wherein superabrasive grains are dispersed in a metal binder phase, and precipitate particles made of an intermetallic compound are dispersed in the structure of the metal binder phase. Item 3. A grinding wheel for vertical axis grinding according to item 1 or 2.