KR100765457B1 - Vitrified wheel for internal grinding - Google Patents

Abstract

A vitrified wheel for internal grinding is provided to allow for ease of discharge of grinding tips, and improve precision of a workpiece by decreasing a contact area during grinding of an inner surface of the workpiece. A vitrified wheel(30) for internal grinding includes a grinding tip(31) having a grinding member(311) for grinding an inner surface of a workpiece, and a bonding agent(312) for bonding particles of the grinding member. The grinding tip is divided into a plurality of tips in a lengthwise direction, and a space(313) is formed between divided tips.

Description

Vitrified Wheel for Internal Grinding}

Fig. 1 is a cross-sectional view of a conventional bite tree wheel for inner-

2 is a cross-sectional view of the inner tree grinding bit tree according to the present invention

Fig. 3 is a cross-sectional view of another inner wheel grinding bit tree according to the present invention

4 is a cross-sectional view of another bite tree wheel for internal diameter grinding according to the present invention

Description of the Related Art [0002]

10, 20, 30, 40, 50 ... bit tree wheels 11, 21, 31, 41, 51 .. grinding tips

12, 22, 42, 52 ... Shank 53 ... Cushion Layer

111, 211, 311, 411, 511 ... abrasive

112, 212, 312, 412, 512 ... binder

313, 413, 513 ... Space

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an inner diameter grinding wheel for grinding an inner diameter of gears, inner diameters of gears, various materials such as compressors, and the like, and more particularly to an inner diameter grinding wheel for vitrified bond wheels ).

And a bite wheel for inner diameter grinding is used to grind the inner diameters of bearings and gears such as air conditioner compressors and inner diameters of general bearings.

The tree wheel is usually divided into a diamond grinding wheel and a cubic boron nitride (CBN) grinding wheel, depending on the applied particles.

The diamond wheel is suitable for grinding and processing non-iron materials such as ceramics, cemented carbide, glass, and cermet.

The CBN grinding wheel is suitable for grinding and processing of heat-treated steel, high-speed steel, alloy and the like because it has low reactivity with workpieces, has excellent thermal strength at high temperature, and is capable of machining stability of workpieces and high-

The tree wheel means that the abrasive material of the abrasive portion is a diamond or a CBN particle. The abrasive wheel means abrasive material such as alumina (Aluminum) using ordinary grinding materials such as A (Alundum), WA (White Alundum) C (Carborundum), GC (Green Carborundum) (Al ₂ O ₃ ) or silicon carbide (SiC, Silicon Carbide) grinding wheels.

The abrasive grains of the wheel may be formed by molding powdery diamond or CBN particles and a binder into a mold of a certain shape generally referred to as a mold and press molding or molding using an injection molding method and using an electric furnace or a continuous furnace Followed by sintering.

RESIN BOND, which uses a synthetic resin system, and METAL BOND vitreous binder (FRIT), which mainly consists of metals such as iron, copper, tungsten, and tin, are used depending on the kind of binder to hold the particles. VITRIFIED BOND (VITRIFIED BOND).

The binders may be used in combination depending on the application area and the manufacturing method.

In order to satisfy the needs of current diversified workpieces, processing methods, and the quality of demanding workpieces, grinding quality and tool life, workpiece quality, and cost reduction are more demanded than conventional conventional grinding wheels, such as alumina and silicon carbide, The application of trifidal grinding wheels has been expanding, especially in the case of internal grinding.

FIG. 1 shows an example of a conventional inner tree grinding bit tree wheel. As shown in FIG. 1 (a), the inner tree wheel 10 for inner diameter grinding includes a grinding tip 11 and a shank 12 do.

The grinding tip 11 includes an abrasive material 111 for grinding the inner diameter of the workpiece and a binder 112 for holding the abrasive material 111. Pores are formed in the grinding tip 11.

The tree wheel 10 is coupled to a shaft (not shown) connected to a driving source, and is reciprocated and rotated.

1 (b) shows another bit tree wheel 20 for the inner diameter grinding. The bit tree wheel 20 for the inner diameter grinding includes the grinding tip 21 and the shank 22.

The grinding tip 21 includes an abrasive material 211 for grinding the inner diameter of the workpiece and a bonding agent 212 for holding the abrasive material 211. A cushion layer 23 is provided between the grinding tip 21 and the shank 22 and pores are formed in the grinding tip 21.

Normally, the grinding tip is manufactured using particles having the same composition as the binder, and grinding materials having the same particle size are distributed with the same concentration.

However, in actual grinding tips, unevenness occurs in the composition of the binder, the particle size of the grinding material, the concentration and the pore distribution, and this phenomenon becomes worse as the length of the grinding tip becomes longer.

Normally, the grinding tip of the inner wheel grinding bit tree wheel has a single grinding tip, that is, when the grinding tip has a length of less than 50 mm, a binder of the same composition is used, and grinding materials having the same particle size are distributed with the same concentration .

In the case of grinding the inner diameter of the workpiece using the above-described conventional grinding tool for inner circumference grinding, it is difficult to uniformly maintain the quality uniformity of the overall product, that is, the distribution of the pores of the vitrified bond, There is such a problem that the working area (C / T) is lowered because the load is increased due to the large contact area at the time of work and not only the working accuracy (accuracy) of the workpiece is lowered but also the work time is long.

Conventionally, a grinding tip of a tree wheel for an inner diameter grinding is used by connecting a plurality of grinding tips having a length of less than 50 mm when the grinding tip has a length exceeding 50 mm.

However, when a plurality of grinding tips are connected to each other as described above, the above-described problems are brought about.

INDUSTRIAL APPLICABILITY The present invention can physically and / or chemically dividing a grinding tip of a bite wheel for an inner diameter grinding into a plurality of cutting tips, thereby further improving the machining accuracy (accuracy) of the workpiece, It is an object of the present invention to provide a bit tree wheel for internal grinding.

Hereinafter, the present invention will be described.

The present invention relates to a bite wheel for an inner-diameter grinding including a grinding tip including an abrasive material participating in grinding of an inner diameter of a workpiece and a binder for holding the abrasive material,

The grinding tip is divided into a plurality of segments in the longitudinal direction, and a spacer is present between the segmented grinding tips.

The present invention also relates to a grinding tool for grinding an inner diameter grinding wheel including a grinding tip including an abrasive material for grinding an inner diameter of a workpiece, a binder for holding the grinding material, and a shank for driving the grinding tool, In this case,

The grinding tip is divided into a plurality of segments in the longitudinal direction, and a spacer is present between the segmented grinding tips.

The present invention also relates to a grinding tool for grinding an inner diameter grinding wheel including a grinding tip including an abrasive material for grinding an inner diameter of a workpiece, a binder for holding the grinding material, and a shank for driving the grinding tool, In this case,

Wherein the grinding tip is divided into a plurality of segments in the longitudinal direction, and each of the segmented grinding tips has at least one or more properties different from each other in physical and chemical properties.

Hereinafter, the present invention will be described in detail.

The present invention is an improvement of a grinding tip suitably applied to an inner grinding bit tree wheel including a grinding tip including an abrasive material participating in grinding of an inner diameter of a workpiece and a binder for holding the abrasive material.

In the inner tree grinding bit tree according to the present invention, the grinding tool is divided into a plurality of grinding tools in the longitudinal direction.

A space is present between the divided grinding tips, and the size of the space is preferably 3 mm or less.

Here, the size of the spacer means the size of the grinding tip in the longitudinal direction.

When the size of the spacer exceeds 3 mm, there is a high possibility that a non-ground portion is generated in the inner diameter grinding of the workpiece, and the grinding tip edge portion is likely to fall off. Therefore, the size of the spacer is preferably limited to 3 mm or less Do.

The preferred size of the spacer is 0.5 to 1 mm.

The number of the divided grinding tips is preferably limited to 1L / 5 to 1L / 10 when the length of the grinding tip is "L ", because if the number of divided grinding tips is too small, It is difficult to keep the workpiece uniformly. Further, since the contact area is wide during the inner diameter grinding work of the workpiece, the workload is increased and the working accuracy (machining accuracy) of the workpiece is lowered. There is a problem.

However, when the number of the divided grinding tips is too large, the grinding tip is shaken at the time of grinding the workpiece, so that the accuracy of grinding is lowered, and the life of the grinding tip is shortened.

In the grinding tip of the present invention, the degree of concentration of the abrasive is preferably about 100 to 220%, because if the degree of concentration is too small, the grinding efficiency is lowered and the service life is deteriorated. If the abrasive is too large, It causes a phenomenon.

It is preferable that the size of the abrasive is set to 60 to 325 mesh because if the abrasive particles are too small, the grinding efficiency is lowered and the burning phenomenon may occur due to clogging, The grinding efficiency can be increased, but the required roughness of the ground surface of the workpiece becomes too rough.

The size difference of the abrasive between the divided grinding tips is preferably 3 times or less.

The amount of pores formed in the grinding tip of the present invention is preferably about 25 to 50%.

In the present invention, the bonding agent of the grinding tip is not particularly limited, and any glassy binder may be used. As the most preferable binder, borosilicate glass may be used. In addition, phosphate glass, alkali glass and the like may be used.

The borosilicate glass is _{SiO 2, Al 2 O 3,} B 2 O 3, CaCO 3 And CaO.

Meanwhile, the grinding tip of the present invention may be composed of 10 to 40 vol% binder, 0 to 30 vol% filler, 0 to 20 vol% pore-forming agent, and the remaining abrasive material.

Examples of the filler include abrasive particle auxiliary materials such as alumina, silicon carbide, and water light.

The above-mentioned pore-forming agents are components that facilitate grinding load reduction and chip discharge during grinding.

In another embodiment of the present invention, the grinding tip is divided into a plurality of segments in the longitudinal direction, and the segmented grinding tips have at least one or more different physical and chemical properties.

A spacer having a size of 3 mm or less may be placed between the divided grinding tips, but it may not be provided with a spacer.

The physical properties include the size and concentration of the abrasive, pore size and distribution, and the chemical properties include the type of abrasive and the composition of the binder.

In the present invention, the abrasive is not particularly limited, but preferable examples of the abrasive include diamond particles, CBN particles, and the like.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 2 shows an example of a tree wheel for an inner diameter grinding according to the present invention. As shown in FIG. 2, the inner wheel grinding bit wheel 30 of the present invention has an inner grinding wheel 30, 311 for holding the grinding material 311 and a bonding agent 312 for holding the grinding material 311.

The grinding tip 31 is divided into a plurality of segments in the longitudinal direction, and a spacer 313 exists between the segmented grinding tips 31.

The size of the spacer 313 is preferably 3 mm or less.

The inner wheel grinding bit wheel 30 may be used in combination with the rotating body.

FIG. 3 shows another example of the inner tree grinding bit tree according to the present invention. As shown in FIG. 3, the inner tree grinding bit wheel 40 of the present invention has a grinding wheel (411) for holding the grinding material (411) and a bonding agent (412) for holding the grinding material (411).

The grinding tip 41 is divided into a plurality of segments in the longitudinal direction.

A spacer 413 is present between the divided grinding tips 41.

The size of the space is preferably 3 mm or less.

The divided grinding tips 41 are fixed to the shank 42.

The shank 42 is coupled to the driving means to rotate and reciprocate.

The method of fixing the divided grinding tips 41 to the shank 42 is not particularly limited. As shown in FIG. 3, a method of fixing the grinding tips 41 by the fixing bolts 2, a method of directly fixing the grinding tips 41 by welding, And the like.

The rotation and reciprocation of the grinding tip 41 and the shank 42 are connected to a shaft (not shown) or the like which is connected to the driving means (not shown) and reciprocates while rotating, as shown in FIG. 3 Lt; / RTI >

Therefore, the inner diameter grinding by the inner tree grinding inner ring grinding wheel of the present invention can be performed by rotating the shank and the grinding stone fixed to the shaft by the rotation of the shaft.

FIG. 4 shows another example of the inner tree grinding wheel according to the present invention. As shown in FIG. 4, in the inner wheel grinding wheel 50 of the present invention, the grinding tips 51 and A cushion layer 53 may be provided between the shanks 52. [

The grinding tip 51 is divided into a plurality of segments in the longitudinal direction, and a spacer 513 is present between the divided grinding tips 51.

4, reference numerals "511" and "512" represent abrasive and binder, respectively.

The grinding tips 31, 41 and 51 are divided into a plurality of grinding tips 31 in the longitudinal direction, and the grinding tips 31, 41, The grinding tips may have different physical properties in terms of physical and chemical properties, such as varying the average size of the grinding material distributed in each grinding tip.

As described above, in the case where the physical and chemical properties of the divided grinding tips are different from each other, it is possible to place a spacer having a size of 3 mm or less between the divided grinding tips, but not with a spacer .

As described above, the present invention has the effect of facilitating the discharge of the abrasive chips, stabilizing the equipment, shortening the machining time (C / T), providing superior grinding stability, and improving the machining accuracy of the workpiece.

Claims (24)

A grinding tool (31) for grinding an inner diameter of a workpiece and a grinding tip (31) including a grinding tool (311) for holding the grinding tool (311) Wherein the grinding tip (31) is divided into a plurality of segments in the longitudinal direction, and a spacer (313) is present between the segmented grinding tips A grinding tip 41 including an abrasive 411 for grinding the inside diameter of the workpiece and a binder 412 for holding the grinding tool 411 and a grinding tool 416 connected to the driving means to drive the grinding tip 41 In the inner wheel grinding bit tree wheel including the shank 42, Wherein the grinding tip (41) is divided into a plurality of segments in the longitudinal direction, and a spacer (413) is present between the divided grinding tips 3. The internal grinding wheel according to claim 2, wherein a size of a space between the divided grinding tips is 3 mm or less 4. The internal grinding wheel according to claim 3, wherein the spacer size is 0.5 to 1 mm. The method according to any one of claims 2 to 4, wherein the number of the divided grinding tips is 1L / 5 to 1L / 10 when the length of the grinding tip is "L & Tree wheel The method of any one of claims 2 to 4, wherein the concentration of the abrasive material (411) is 100 to 220%, and the size of the abrasive material (411) is 60 to 325 mesh Tree wheel for internal grinding 4. The inner grinding wheel according to any one of claims 2 to 4, wherein a cushion layer is provided between the grinding tip (41) and the shank (42) The method of any one of claims 2 to 4, wherein the binder (412) of the grinding tip (41) is borosilicate glass and the grinding tip (41) has 25 to 50% Tree wheel for internal grinding A grinding tip 51 including an abrasive 511 for grinding the inner diameter of the workpiece and a binder 512 for holding the grinding tool 511 and a grinding tool 51 for driving the grinding tip 51, In the inner tree grinding bit tree wheel including the shank 52, Wherein the grinding tip (51) is divided into a plurality of segments in the longitudinal direction, and the segmented grinding tips are different in at least one of physical and chemical properties 10. The method according to claim 9, wherein the physical properties include the size of the abrasive, the concentration of the abrasive, the pore size and the distribution, and the chemical nature includes the type of abrasive and the composition of the binder. 11. The internal grinding wheel according to claim 9 or 10, characterized in that a space of 3 mm or less exists between the divided grinding tips 12. The internal grinding wheel according to claim 11, wherein the spacer size is 0.5 to 1 mm. 12. The internal grinding wheel according to claim 11, wherein the number of the divided grinding tips is 1L / 5 to 1L / 10 when the length of the grinding tip is "L & 13. The internal grinding wheel according to claim 12, wherein the number of the divided grinding tips is 1L / 5 to 1L / 10 when the length of the grinding tip is "L & 12. The internal grinding wheel according to claim 11, wherein the concentration of the grinding material (511) is 100 to 220%, and the size of the grinding material is 60 to 325 mesh. 13. The method according to claim 12, wherein the concentration of the grinding material (511) is 100 to 220%, and the size of the grinding material is 60 to 325 mesh. 14. The method according to claim 13, wherein the concentration of the grinding material (511) is 100 to 220%, and the size of the grinding material is 60 to 325 mesh. 15. The method of claim 14, wherein the concentration of the grinding material (511) is 100 to 220%, and the size of the grinding material is 60 to 325 mesh. 12. The internal grinding wheel according to claim 11, wherein a cushion layer (53) is provided between the grinding tip (51) and the shank (52) 13. The internal grinding tool according to claim 12, wherein a cushion layer (53) is provided between the grinding tip (51) and the shank (52) 14. The internal grinding wheel according to claim 13, wherein a cushion layer (53) is provided between the grinding tip (51) and the shank (52) 12. The method of claim 11, wherein the binder (512) of the grinding tip (51) is borosilicate glass and the grinding tip (51) has 25 to 50% 13. The method according to claim 12, wherein the binder (512) of the grinding tip (51) is borosilicate glass and the grinding tip (51) has 25 to 50% 14. The method of claim 13, wherein the binder (512) of the grinding tip (51) is borosilicate glass and the grinding tip (51) has 25 to 50%

Images