JP2004017235A - Grinding method and grinding device of total type grind stone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding method of a total type grinding stone with longer service life, wherein because vibration is easily generated by moving imbalance due to high-speed rotation of the total type grinding stone, a vibration means need not be added to a grinding device, thus, processing manhours are not required, a caloric power is small, and detachment and wear of abrasive grains, and adherence of cutting chips to the surface of the total type grinding stone are small, so that grinding efficiency is good, and also to provide a grinding device. <P>SOLUTION: The total type grinding stone 23 has silicon carbide grinding grains (CBN) adhered to its material surface. A groove 26 of disc 25 of a troidal continuously variable transmission is cut out by making the total type grinding stone 23 forcibly generate moving imbalance vibration. The grinding device with the total type grinding stone is provided with a total type grinding stone quill 22 at an end of a high-frequency spindle 21, and the total type grinding stone 23 is fixed to at the tip central part of the quill 22. A balancer 28 provided on the outer circumferential side surface of the quill 22 generates the rotation movement imbalance. <P>COPYRIGHT: (C)2004,JPO

Description

【００２５】
アンバランサ９の具体的な構成は、総型研削砥石クイル２の側面にエンドミルによって穴径４ｍｍ、深さ２ｍｍの小穴を開けたものである。
このときの総型研削砥石クイルの半径は６ｍｍ、総型研削砥石クイル２の材質である鋼の比重は７．８ｇで、２００００ｒｐｍ　で動アンバランス量は０．１９ｇ×６ｍｍ＝１．１４ｇｍｍであった。動アンバランサの具体的な構成を表２で示す。
【００２６】
【表２】

【００２７】
前記したように、総型研削砥石の研削方法およびその装置は、研削砥石に強制振動を発生させるために砥石の研削面とワークとの間に間隙が発生して研削抵抗が小さかった。また、砥石クイルの側面に小穴を開けるのみで上記振動を発生させるようにしたので設備費が不要であった。
【００２８】
【発明の効果】
以上説明したように本発明に係る総型研削砥石の研削方法および研削装置は、総型研削砥石の高速回転による動アンバランスを発生させて、研削砥石に振動を強制発生させながら研削加工を行うために、この振動により総型研削砥石の砥粒面と加工ワークとの間に間隙が発生しこの間隙で研削液の流入が促進され、研削加工による発熱が研削液により抑制され、研削粉の排出が促進され総型研削砥石表面への研削粉の溶着が減少する。
したがって、研削抵抗を低減することができ総型研削砥石の砥粒の脱落や磨耗が少なく、砥石寿命も長いので加工効率の良い総型研削砥石の加工方法である。また、これらの振動発生手段を総型研削砥石の高速回転による動アンバランスによって簡単に発生させ得るために、研削装置への振動部材の附加が必要ないばかりでなく、その加工工数や設備費用を必要としない安価な総型研削砥石の研削方法および装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の第１実施形態を示す一部縦断側面図である。
【図２】本発明の第２実施形態を示す一部縦断側面図である。
【図３】従来のたわみ振動体を設けた一例を示す側面図である。
【図４】従来のチップホルダを振動させて切削する一例を示す側面図である。
【符号の説明】
１、２１　　　高周波スピンドル
２、２２　　　総型研削砥石クイル
３、２３　　　総型研削砥石
４　　　　　　被研削加工ワーク
５　　　　　　スライドテーブル
６　　　　　　総型研削砥石スピンドル
７、２７　　　高周波スピンドルの端部
８　　　　　　レール溝
９、２８　　　アンバランサ
１０　　　　　ボルトネジ
１１、３０　　オイルミストノズル
１２、３１　　オイルミスト
２４　　　　　被加工ワークの固定台
２５　　　　　トロイダル型無段変速機のデイスク
２６　　　　　トロイダル型無段変速機のデイスク内周面のスプライン溝[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a grinding method and a grinding apparatus for a general-type grinding wheel, in which a general-purpose grinding wheel is brought into contact with a processing surface of a workpiece to be ground and a workpiece is ground to a desired shape.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a processing technique of performing a cutting process by generating ultrasonic vibration in a processing tool of a cutting device.
[0003]
That is, as disclosed in JP-A-63-283801, a turret head is provided with a vibration holder to reduce the cutting resistance in order to perform ultrasonic vibration cutting by applying ultrasonic vibration to a processing tool. Are known.
An example will be described with reference to FIG. The flexural oscillator 40 is divided at an intermediate portion, and two electrostrictive elements 42 and 43 are provided at the intermediate portion with an electrode plate 44 interposed therebetween.
[0004]
These flexural vibrators and electrostrictive elements are tightened by bolts 49 through holes provided in the center portion of the electrode plate, and cutting is performed by the cutting tool 47 while applying ultrasonic vibration to the cutting tool holder 46 in the processing direction. . The work of L / D = 20 to 30 can be cut by reducing the cutting resistance by the ultrasonic vibration.
However, equipment costs such as the metal material 41, the electrostrictive elements 42 and 43, and the electrode plate 44 are required. Further, processing for dividing the metal material 41 and assembling time of the metal material by the division, the electrostrictive elements 42 and 43, the electrode plate 44, and the like are required.
[0005]
As another example of the vibration generating means, as disclosed in Japanese Patent Application Laid-Open No. 3-136701, a tip holder mounting head 52 is attached to the tip of a shank 51 in an adjustable manner. The head 52 is fixed to the shank 51 at an arbitrary angle so as to be adjustably fixed to the shank 51 by bolts, and the head 52 for mounting the tip holder can be automatically vibrated via a spring. The chip holder 53 is attached.
[0006]
By fixing a throw-away tip 54 to the tip of this holder, a self-excited oscillation type tip holder is swingably attached to the head, and a gap is provided between the tip holder receiving surface of the head and the lower surface of the tip holder. I have. The gap is adjusted so that the amplitude of the cutting edge can be changed, and the workpiece 55 is subjected to vibration cutting.
In such an apparatus, not only the processing time for the shank 51, the head 52 and the like is required, but also the time for adjusting the gap interval is required.
[0007]
[Problems to be solved by the invention]
In order to generate vibration to the cutting tool of the cutting device, it is necessary to apply vibration generating means to the tool holder, or to provide a gap between the chip holder receiving surface and the lower surface of the chip holder to the cutting device itself. Expensive equipment costs for the vibration generating means are required, and there are problems such as a need for processing and assembling time of the vibration generating means.
In addition, in the case of grinding with a mold grinding wheel, the calorific value increases as the contact area between the mold grinding wheel and the workpiece increases, causing the abrasive grains to fall off and wear, and the cutting powder to be applied to the surface of the mold grinding wheel. There is a problem that the grinding efficiency is deteriorated due to the adhesion of particles and the life of the grinding wheel is shortened.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a total die which does not require the addition of a vibration means to the grinding device because vibration generation can be easily obtained by dynamic imbalance due to high-speed rotation of the total grinding wheel, and does not require equipment cost and processing man-hours. An object of the present invention is to provide a grinding method and a grinding device for a grinding wheel.
In addition, the method of grinding a total-type grinding wheel with a low calorific value, a drop and wear of abrasive grains, small adhesion of cutting powder to the surface of the total-type grinding wheel, good grinding efficiency and grinding efficiency, and a long service life of the total-type grinding wheel And a grinding device.
[0009]
[Means for Solving the Problems]
In the method of grinding a forming die grinding wheel according to claim 1 of the present invention, the work surface of a work to be ground is brought into contact with a forming type grinding wheel, and the workpiece is ground to a desired shape by high-speed rotation of the forming type grinding wheel. A method of performing a forming-type grinding wheel, wherein a grinding process is performed while forcibly generating vibration on the forming-type grinding wheel.
[0010]
According to the grinding method of the forming-type grinding wheel having the above-described configuration, a dynamic unbalance is generated by the high-speed rotation of the forming-type grinding wheel, and the grinding is performed while forcibly generating the vibration in the grinding wheel. A gap is created between the abrasive surface of the die grinding wheel and the workpiece to be ground, and the inflow of the grinding fluid is promoted in this gap, the heat generated by the grinding is suppressed by the grinding fluid, and the discharge of the grinding powder is promoted. Welding of grinding powder on the die grinding wheel surface is reduced.
Therefore, the grinding resistance can be reduced, the abrasive grains of the integrated grinding wheel are less likely to fall off and wear, and the life of the grinding wheel is long. Note that the collective grinding wheel is a wheel that simultaneously grinds a plurality of grinding surfaces (for example, U, V grooves, curved surfaces, etc.).
[0011]
According to a second aspect of the present invention, there is provided an apparatus for grinding a general-type grinding wheel, wherein the general-type grinding wheel is brought into contact with a processing surface of a workpiece to be ground, and the workpiece is ground by a high-speed rotation of the general-type grinding wheel. An apparatus for grinding a general-type grinding wheel, characterized in that an unbalancer is provided on the general-type grinding wheel or the general-type grinding wheel quill to forcibly generate dynamic unbalance vibration.
[0012]
According to the grinding device of the form grinding wheel having the above configuration, the vibration generating means can be easily generated by dynamic imbalance due to the high-speed rotation of the form grinding wheel, so that it is not only necessary to add a vibration member to the grinding device. No processing man-hours or equipment costs are required. The dynamic imbalance means that if the mass of the rotating object is not uniform in the circumferential surface and the radial direction around the rotation axis, vibration is generated by high-speed rotation. The shaft diameter of the spindle is different from the diameter of the mounting hole at the tip of the high-frequency pindle.
[0013]
The grinding device for a forming-type grinding wheel according to claim 3 of the present invention is characterized in that an unbalancer is applied to the grinding wheel of the forming-type grinding wheel or the grinding wheel spindle to forcibly generate vibration. It is a grinding device for die grinding wheels.
[0014]
According to the grinding device for a forming-type grinding wheel having the above configuration, the balancer may fix a balance weight having a certain mass to the forming-type grinding wheel quill, or the outer peripheral surface of the forming-type grinding wheel spindle. A part of the outer peripheral side surface may be cut out with a drill or the like.
Further, since a part of the outer peripheral grinding surface of the form grinding wheel material is cut off and abrasive grains are fixed thereto, a form grinding wheel may be used, so that no equipment cost is required.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of a grinding method and a grinding apparatus for a general-purpose grinding wheel to which the present invention is applied will be described in detail with reference to FIG. Further, a second embodiment to which the present invention is applied will be described in detail with reference to FIG.
FIG. 1 is a partially cutaway side view of an apparatus of the present invention for performing groove processing of a rail or the like with a general-purpose grinding wheel. FIG. 2 shows a plurality of grooves provided on the inner peripheral surface of the disk of the toroidal-type continuously variable transmission in the axial direction, and the grooves provided on the outer peripheral surface of the rotating shaft (not shown) for fitting and fixing the grooves. FIG. 2 is a partially cutaway side view of the apparatus of the present invention which is designed to perform a grinding process using a mold grinding wheel.
[0016]
As shown in FIG. 1, the forming-type grinding wheel 3 of the first embodiment is one in which silicon carbide abrasive grains (CBN) are fixed to the surface of the forming-type grinding wheel material, and grinds the rail groove 8. In the grinding device for a general-type grinding wheel, the general-type grinding wheel quill 2 is fixedly provided at the center of the end portion 7 of the high-frequency spindle 1, and the general-type grinding wheel 3 is fixed to the center of the tip of the grinding wheel quill 2. The formed model grinding wheel spindle 6 is fixed with a bolt screw 10.
[0017]
On the other hand, the work 4 to be ground is slidable in the direction of the forming grinding wheel 3 and slidable in the length direction of the rail groove 8. Further, it is fixed to a slide table 5 which can be moved in the vertical direction.
The oil mist nozzle 11 injects a cooling oil mist 12 toward the grinding unit. An unbalancer 9 for obtaining a rotational unbalance is provided on the outer peripheral side surface of the mold grinding wheel quill 2.
[0018]
The specific configuration of the unbalancer 9 is such that a small hole having a hole diameter of 4 mm and a depth of 2 mm is formed on the side surface of the blank grinding wheel quill 2 by an end mill.
In addition, this unbalancer 9 may fix a balance weight having a certain mass to the outer peripheral side surface of the complete grinding wheel quill 2 or the overall grinding wheel spindle 6. May be cut out. Further, although not shown in the drawings, it is also possible to use a general-type grinding wheel in which a part of the outer peripheral grinding surface of the general-type grinding wheel material is cut out and abrasive grains are fixed.
[0019]
Next, the operation of the forming die grinding wheel of the first embodiment will be described.
The side surface of the die grinding wheel 3 and the groove processing surface of the work 4 to be ground are provided facing each other, and the die grinding wheel 3 is rotated at 20000 rpm to process the side surface of the die grinding wheel 3 and the work 4 to be ground. The sliding table 5 is slid in the longitudinal direction of the groove of the rail at a certain speed, and the forming grindstone 3 and the work 4 to be ground are gradually brought close to each other. Grinding is performed while jetting from the oil mist nozzle 11.
[0020]
Next, as shown in FIG. 2, the mold grinding wheel 23 of the second embodiment has silicon carbide abrasive grains (CBN) fixed to the surface of the mold grinding wheel material. A long hole is provided at the center of rotation of the disk 25 of the toroidal-type continuously variable transmission, and a plurality of spline grooves 26 are provided on the inner peripheral surface of this hole.
In the grinding device for a general-type grinding wheel, a general-type grinding wheel quill 22 is provided at an end 27 of a high-frequency spindle 21, and a general-type grinding wheel 23 is fixed to the center of the tip of the general-type grinding wheel quill 22. I have.
[0021]
On the other hand, the disk 25 of the continuously variable transmission can be moved back and forth in the direction of the forming grindstone 23 and is fixed to a fixed base 24 of the work to be index-rotated. The oil mist nozzle 30 injects the cooling oil mist 31 toward the grinding unit.
An unbalancer 28 for obtaining the above-described rotational dynamic imbalance is provided on the outer peripheral side surface of the mold grinding wheel quill 22.
The unbalancer 28 may be fixed with a balance weight having a certain mass, and a part of the outer peripheral side surface of the general-purpose grinding wheel quill 22 may be cut out by an end mill or the like. In addition, silicon carbide abrasive grains (CBN) are used as the abrasive grains of the mold grinding wheel, but they may be bonded to the surface of the mold grinding wheel material using diamond, fused alumina, or the like.
[0022]
Next, the operation of the forming-type grinding wheel grinding device of the second embodiment will be described.
A side surface of the forming-type grinding wheel 23 and a spline groove 26 on an inner peripheral surface of the disk 25 of the toroidal-type continuously variable transmission are provided so as to face each other, and the forming-type grinding wheel 23 is rotated at 20000 rpm. The mold grinding wheel 23 provided on the high-frequency spindle 21 of the grinding device is brought into contact with the processing surface of the disk 25, and the fixed table 24 of the work to be processed is moved at a certain speed in the length direction of the spline groove 26 of the disk 25. Slide.
Then, the forming grindstone 23 is gradually approached in the depth direction of the spline grooves 26 on the inner peripheral surface of the disk 25, and the grinding is performed while the cutting oil mist 31 is jetted from the oil mist nozzle 30.
[0023]
【Example】
Table 1 shows a comparison between the grinding apparatus of the present invention and the processing conditions of the shaping grinding wheel having no vibration that does not cause dynamic imbalance. In the case of processing using a shaping grinding wheel without vibration, a shaping grinding wheel having a low level of both the degree of bonding and concentration of the abrasive grains had to be used, and the grinding resistance was about 60% higher. This condition is shown in Table 1.
[0024]
[Table 1]

[0025]
The specific configuration of the unbalancer 9 is such that a small hole having a hole diameter of 4 mm and a depth of 2 mm is formed on the side surface of the blank grinding wheel quill 2 by an end mill.
At this time, the radius of the mold grinding wheel quill was 6 mm, the specific gravity of the steel used as the material of the mold grinding wheel quill 2 was 7.8 g, and the dynamic unbalance amount was 0.19 g × 6 mm = 1.14 gmm at 20,000 rpm. Was. Table 2 shows a specific configuration of the dynamic ambalancer.
[0026]
[Table 2]

[0027]
As described above, in the method and the apparatus for grinding the general-purpose grinding wheel, a gap is generated between the grinding surface of the grinding wheel and the work because forced vibration is generated in the grinding wheel, and the grinding resistance is small. Further, since the above-mentioned vibration is generated only by making a small hole in the side surface of the grinding wheel quill, no equipment cost is required.
[0028]
【The invention's effect】
As described above, the grinding method and the grinding apparatus of the forming grinding wheel according to the present invention perform the grinding while generating the dynamic imbalance due to the high-speed rotation of the forming grinding wheel and forcibly generating the vibration in the grinding wheel. Due to this vibration, a gap is generated between the abrasive grain surface of the forming grinding wheel and the workpiece, and the inflow of the grinding fluid is promoted in this gap. Discharge is promoted, and welding of grinding powder to the surface of the grinding wheel is reduced.
Therefore, it is a method of processing a general-type grinding wheel with high processing efficiency because the grinding resistance can be reduced, the abrasive grains of the general-type grinding wheel are less likely to fall off and wear, and the grinding wheel life is long. In addition, since these vibration generating means can be easily generated by dynamic imbalance due to high-speed rotation of the forming grinding wheel, not only is it unnecessary to add a vibration member to the grinding device, but also the processing man-hour and equipment cost are reduced. It is possible to provide an inexpensive forming die grinding method and apparatus which is not required.
[Brief description of the drawings]
FIG. 1 is a partially longitudinal side view showing a first embodiment of the present invention.
FIG. 2 is a partially longitudinal side view showing a second embodiment of the present invention.
FIG. 3 is a side view showing an example in which a conventional flexural vibrator is provided.
FIG. 4 is a side view showing an example of cutting by vibrating a conventional chip holder.
[Explanation of symbols]
1,21 High frequency spindle 2,22 Form grinding wheel quill 3,23 Form grinding wheel 4 Work to be ground 5 Slide table 6 Form grinding wheel spindle 7,27 End of high frequency spindle 8 Rail groove 9,28 Ambalancer DESCRIPTION OF SYMBOLS 10 Bolt screw 11, 30 Oil mist nozzle 12, 31 Oil mist 24 Fixed base 25 for work to be processed 25 Disk of toroidal type continuously variable transmission 26 Spline groove of disk inner peripheral surface of toroidal type continuously variable transmission

Claims (3)

A grinding method of a general-type grinding wheel, in which a processing surface of a workpiece to be ground is brought into contact with a general-type grinding wheel, and a high-speed rotation of the general-type grinding wheel performs grinding of a target shape on the work.
A grinding method for a complete grinding wheel, characterized in that grinding is performed while forcibly generating vibration. An apparatus for a general-type grinding wheel, which is configured to contact a general-type grinding wheel with a processing surface of a workpiece to be ground and perform high-speed rotation of the general-type grinding wheel to perform grinding of a target shape on the work.
An apparatus for forming a complete form grinding wheel, wherein an unbalancer is provided on the complete form grinding wheel or quill of the complete form grinding wheel to forcibly generate dynamic unbalance vibration. 3. The apparatus for grinding a complete form grinding wheel according to claim 2, wherein an unbalancer is applied to the grindstone or the grindstone spindle of the complete form grinding wheel to forcibly generate vibration.

Images