JP3918894B2 - Rotating processing apparatus and rotating processing method for ring-shaped workpiece - Google Patents

Description

【００２８】
上記結果から明らかなように、本発明の回転加工装置１によれば、偏肉に対しては、１／３程度にまで大きく低減させることができ、偏肉改善に特に顕著な効果があることが判明した。尚、真円度に対しては従来方法による比較例と略同等の低いレベルで、研削加工で十分に矯正できる範囲に収まっている。
【００２９】
【発明の効果】
本発明に係るリング状被加工物の回転加工装置及び回転加工方法は、チャック爪によってインロー型ハウジングをチャッキングし、このインロー型ハウジング内に被加工物を収納すると共に、外周加圧ロールによってインロー型ハウジングの一方の内壁面に押し付け、且つ側面加圧ロールによってインロー型ハウジング内壁面に弾性的に押し付けて加工が行われる。従って、被加工物をチャック爪によって直にチャッキングされず、いびつに変形させることなく、加工ツールによって偏肉を発生させること無く、高い真円度を保ちつつ高精度で加工することができる。
また、被加工物は外周加圧ロールによってインロー型ハウジング側に押し付けられると共に、側面加圧ロールによりインロー型ハウジング内壁面に弾性的に押さえ付けられるので、回転加工時の回転トルクが確実に伝達され、且つ被加工物をスリップさせることなく、加工精度を向上させることができる。
【図面の簡単な説明】
【図１】本発明に係る回転加工装置の一実施形態における構成を示す正面図である。
【図２】図１の回転加工装置の構成を示す平面図である。
【図３】インロー型ハウジングに被加工物を取り付ける様子を示す斜視図である。
【図４】インロー型ハウジングの形状を示す説明図である。
【図５】インロー型ハウジング内に収納された被加工物が外周予圧ロールにより押圧される様子を示す説明図である。
【図６】側面加圧ロールを３本で形成した他の構成を示す図である。
【図７】加工ツールとして研削砥石を用いて研削加工を行う様子を示す説明図である。
【図８】従来の旋盤装置の構成を示す正面図である。
【図９】従来の旋盤装置の構成を示す平面図である。
【図１０】被加工物の把持状況を示す説明図である。
【符号の説明】
１ 回転加工装置
１０ チャック
１１ インロー型ハウジング
１２ 被加工物
１７ 側面加圧ロール
２０ バイト
２６ 外周加圧ロール
３０ 研削砥石[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating apparatus and a rotating method for a thin-walled workpiece for turning or grinding a workpiece such as a thin-walled bearing using a lathe device or the like, and in particular, processing a thin-walled workpiece with high accuracy. Related to technology.
[0002]
[Prior art]
Generally, in order to perform turning or grinding on a ring-shaped workpiece, for example, a rotary processing device 51 shown in FIGS. 8 and 9 is used. The rotary processing apparatus 51 of FIG. 8 is a general ordinary lathe, and includes a spindle stock 53 provided on a bed 52, a tool rest 55, and a core presser base 56. A chuck 54 that is a collet chuck is attached to the headstock 53, and a ring-shaped workpiece 58 is chucked by a chuck claw 57.
The tool post 55 is configured such that the position of the tool 59 can be controlled in the directions of arrows X and Y shown in FIG. 9, and a tool 59 for turning the workpiece 58 is mounted thereon. When grinding is performed, a grindstone or the like (not shown) is attached instead of the cutting tool 59.
[0003]
[Problems to be solved by the invention]
In the rotary processing apparatus 51 having the above configuration, when gripping and releasing the workpiece, the chuck claw 57 is manually contracted or contracted / expanded in the chuck radial direction using hydraulic pressure, pneumatic pressure, or the like as a driving source. Is going.
Therefore, for workpieces with a solid shape or a thick ring shape with sufficient rigidity, deformation of the workpiece due to chucking is not particularly problematic, On the other hand, for a thin ring-shaped workpiece 58 with insufficient rigidity, the workpiece 58 is deformed as shown in FIG. That is, it deforms inward at the contact position of the chuck claws 57 and deforms outward between the chuck claws 57.
When the illustrated workpiece 58 is turned, turning is performed with the cutting tool 59 abutting against the inner surface of the workpiece 58. However, when the workpiece 58 is deformed as described above, the shape after machining is not compressed. It becomes uniform and becomes so-called uneven thickness.
Therefore, in order to reduce the deformation of the workpiece, it has been necessary to weaken the chucking force or to process using a shrinkable yatoy.
[0004]
However, in such a conventional machining method, the thickness deviation accuracy is determined by the spindle rotation center, the distance between the outer diameters, and the position of the machining tool (tool), so that the influence of the deformation and eccentricity of the workpiece increases. Further, it is difficult to suppress the influence of deformation and eccentricity even if the chucking force of the chuck pawl and contraction yatoy is weakened, and the chucking force is small, so that the chuck pawl 55 and the work piece 58 slip (work slip). ) And sufficient rotational torque cannot be transmitted to the workpiece. The same applies to the grinding process.
[0005]
The present invention has been made in view of the above circumstances, and provides a rotary processing apparatus and a rotary processing method for a ring-shaped workpiece that can be accurately processed without uneven thickness even for a thin ring-shaped workpiece. The purpose is that.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a rotary processing apparatus for a ring-shaped workpiece according to the present invention rotates a workpiece to be attached to a spindle via a chuck and processes the inner peripheral surface of the ring-shaped workpiece with a processing tool. In a rotary processing apparatus for a ring-shaped workpiece, an annular housing is formed on the outer periphery of the ring-shaped workpiece, and the workpiece is held on the main shaft by the chuck, and the workpiece is housed inside the annular wall of the inner molding housing. In contrast, an outer peripheral pressure roll that presses the outer peripheral surface in the direction of the center of the main shaft, and a side pressure roll that presses the side surface of the workpiece opposite to the inner mold housing toward the inner mold housing. And processing with the processing tool at a position on the inner peripheral surface side of the position where the outer peripheral pressure roll of the workpiece contacts.
In addition, the method for rotating a ring-shaped workpiece according to the present invention includes attaching a workpiece to a spindle through a chuck and rotating the workpiece, and processing the inner peripheral surface of the ring-shaped workpiece with a processing tool. In a rotational processing method of a workpiece, an inner-lobe housing having an annular wall formed on an outer peripheral portion is gripped by a main shaft by the chuck, the workpiece is received inside the annular wall of the inner-lobe housing, and the outer circumferential surface is The workpiece is pressed in the direction of the center of the spindle by a pressure roll and the side of the workpiece opposite to the spigot housing is pressed to the spigot housing by a side pressure roll. The position on the inner peripheral surface side of the position where the outer peripheral pressure roll abuts is processed by the processing tool.
[0007]
In this rotary processing device for a ring-shaped workpiece, the workpiece is not directly chucked by a chuck, but is stored in an inlay-type housing, and the workpiece is inlaid by an outer peripheral pressure roll. The workpiece is pressed against one inner wall surface of the mold housing, and the workpiece is elastically pressed against the inlay mold housing by the side pressure roll, and in this state, the workpiece is processed.
According to this configuration, the workpiece is not locally pressed and gripped, and is pressed along the inner wall surface of the inlay housing, so that the ring shape of the workpiece is deformed into an irregular shape. While being prevented, it can be rotated integrally with the chuck by pressing the outer peripheral pressure roll. Therefore, it is possible to perform processing while keeping the distance between the outer peripheral pressure roll and the processing tool constant, and it is possible to perform processing with high accuracy while preventing occurrence of uneven thickness of the workpiece and maintaining high roundness.
[0008]
Further, it is preferable that the side pressure roll is urged by a preload spring so that the workpiece is always pressed against the inlay housing side during processing.
As a result, the workpiece is reliably held in the in-lobe housing, and vibrations such as rattling associated with the rotation of the spindle can be reduced.
[0009]
Furthermore, the said side surface pressure roll can hold | maintain a workpiece more stably by increasing the press location to a workpiece, and can improve a process precision more.
[0010]
By using a cutting tool as the processing tool, highly accurate turning with very little unevenness and good roundness can be performed, and by using a grinding wheel, even more accurate turning can be performed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a thin ring-shaped workpiece rotation processing apparatus and a rotation processing method according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing the configuration of the rotary machining apparatus, and FIG. 2 is a plan view of the rotary machining apparatus in a machining state. As shown in FIGS. 1 and 2, the rotary processing apparatus 1 according to the present embodiment has a configuration in which a headstock 4, an outer pressure table 5, a tool post 6, and a core table 7 are mounted on a bed 3. A chuck 10 having chuck claws 9 is mounted on the head stock 4 to chuck an inlay type housing 11 described later. The chuck 10 is provided with chuck claws 9 at intervals of 120 ° as shown in FIG.
[0012]
On the other hand, the tailstock 7 is provided with a pedestal 15 capable of reciprocating in the X direction on the bed 3, a slide shaft 16 provided on the pedestal 15 and projecting forward and backward toward the main shaft 4, and a tip of the slide shaft 16. A pair of side surface pressure rolls 17 that are provided and supported so as to be able to come into contact with the end surface of the workpiece 12 so that the rolling surfaces are in contact with each other, and the side surface pressure rolls 17 are elastically biased toward the headstock 4 side. The pressurizing spring 18 is configured.
[0013]
The tool post 6 is movable in the X and Y directions shown in FIG. 2, and feeds and cuts the attached cutting tool 20.
[0014]
Between the chuck 10 and the tool rest 6, there is provided an outer peripheral pressurizing base 5 that biases the workpiece 12 in a direction orthogonal to the main axis direction. The outer periphery pressurization table 5 is a feed 21 fixed on the bed 3 and can be moved in the Y direction by rotating a feed lever 23 on the mount 21 and positioned and fixed at a desired position. A slide 24, a roll support member 25 fixed to the upper part of the feed slide 24, and a set of outer peripheral pressure rolls 26 rotatably supported by the support member 25 are provided.
[0015]
That is, as shown in FIG. 3, for example, two upper and lower end surfaces of the workpiece 12 are pressed against the inner surface of the spigot housing 11 by the side pressure rolls 17 and are held in the spigot housing 11.
[0016]
As shown in FIG. 4, the inlay-type housing 11 is an annular plate having an annular wall portion 11 a formed on the outer peripheral portion, and a gap t is provided between the inner diameter of the wall portion 11 a and the outer diameter of the workpiece 12. The size is formed.
[0017]
Next, a procedure for turning a workpiece by the rotary processing apparatus 1 having the above configuration will be described.
In order to turn the thin ring-shaped workpiece 12 by the rotary processing device 1, first, as shown in FIG. 3, the inlay-type housing 11 is chucked by the chuck claws 9, and the inner-row housing 11 is moved to the inner peripheral side. Insert the workpiece 12.
[0018]
Next, as shown in FIG. 2, the tailstock 7 is moved to the headstock 4 side, and the tailstock 7 is fixed at a position where the side surface pressure roll 17 approaches or contacts the end surface of the workpiece 12. Then, the slide shaft 16 is moved and pressed in a direction protruding toward the headstock 4 side, and a predetermined pressing force is applied to the side pressure roll 17 so that the workpiece 12 is supported in the spigot housing 11. At this time, a predetermined pressing force is always applied to the workpiece 12 from the side pressure roll 17 by the preload spring 18, and the workpiece 12 does not rattle due to vibration during rotation of the spindle. It is more reliably held in the inlay housing 11.
[0019]
Next, the outer peripheral pressure roll 26 is pressed against the outer peripheral surface of the workpiece 12 projecting from the spigot housing 11 by moving the feed slide 24 toward the center of the main shaft. Due to the pressing force of the outer peripheral pressure roll 26 at this time, the workpiece 12 is pressed against the inner wall surface of the inlay housing 11 on the opposite side of the outer peripheral pressure roll 26 as shown in FIG. A part of which contacts the inner wall surface of the spigot housing 11 and elastically deforms. At this time, an auxiliary roll 13 is provided so as to come into contact with the workpiece 12 at an angular position of, for example, 60 ° from the horizontal axis to prevent the workpiece 20 from being lifted by the bite 20 when machining the inner surface. As with the outer peripheral pressure roll 26, the position of the auxiliary roll 13 is fixed at the time of processing, and retracted when unloading after the processing is completed.
[0020]
When the main shaft is rotated in this state, the workpiece 12 is rotationally driven by the friction on the contact surface with the inlay housing 11 along with the rotation of the inlay housing 11 held by the chuck 10, and the outer peripheral pressure roll. 26 and the auxiliary roll 13 are rotated together with the inlay housing 11 while rotating.
[0021]
Then, the cutting tool 6 is moved by moving the tool post 6 to a position facing the outer peripheral pressure roll 26 on the inner peripheral surface of the workpiece 12 to perform cutting. Here, by providing a processing point by the cutting tool 20 on the surface normal at the contact point where the outer peripheral pressing roll 26 contacts the workpiece 12, the interval between the outer pressing roller 26 and the cutting tool 20 is set to be rotationally decentered. Therefore, the thickness of the workpiece 12 can be made uniform with high accuracy, and the occurrence of uneven thickness can be prevented.
[0022]
At this time, when the work 12 is pressed too strongly by the outer peripheral pressure roll 26 and the auxiliary roll 13, the work 12 is deformed into a deformed shape and cannot be turned into a uniform annular shape. Slip is generated by the resistance force 20.
Therefore, when turning, trial processing is performed while adjusting the pressing force of the outer peripheral pressure roll 26 and the auxiliary roll 13 to obtain a pressing force that minimizes the uneven thickness in advance. The optimum pressing force is appropriately selected and set from the characteristic of uneven thickness with respect to pressure. The pressing force at this time is preferably such that about 1/2 of the outer peripheral surface of the workpiece 12 abuts against the inner wall surface of the spigot housing 11 and is set as a guideline.
[0023]
In the above-described embodiment, the workpiece 12 is pressed by the two side surface pressure rolls 17 in the vertical direction. However, the present invention is not limited to this. For example, as shown in FIG. You may comprise so that it may press by the side surface pressure roll 17 about three places of the side surface. In this configuration, it is only necessary to add a side pressure roll 17 provided on the core presser 7 side.
[0024]
According to this configuration, since the workpiece 12 is pressed more uniformly and with a greater force in the inlay housing 11, the friction driving force of the workpiece 12 is increased and a stable rotational force can be obtained. The spindle rotation transmitted to the inlay housing 11 can be reliably transmitted to the workpiece 12 without slipping, reducing the rotational force due to the slip, preventing vibrations such as rattling, and further improving machining accuracy. Can be made.
[0025]
In the above-described embodiment, turning with the cutting tool 20 is shown. However, as shown in FIG. 7, a grinding wheel 30 may be applied instead of the cutting tool 12 to perform grinding. In this case, the same effect can be obtained.
As described above, according to the rotary processing apparatus of the present invention, the deformation due to chucking of the workpiece, which requires special attention when cutting and grinding a thin ring-shaped workpiece that is easily elastically deformed, is considered. In addition, the machining can be performed with high accuracy without performing the centering operation, the working efficiency is improved, and a high-quality product can be easily manufactured.
[0026]
An embodiment in which a workpiece is turned by the rotary processing apparatus 1 described above will be described below. First, the processing conditions by the rotary processing apparatus 1 were set as follows.
(1) Workpiece material: SUJ2 (hardness HRC62-63)
Dimensions: outer diameter φ276mm, inner diameter φ253mm, height (width) 15mm
(2) Machining tool (byte)
Throwaway chip (black ceramic) Sandvik CC600
(3) Inlay type housing material: S45C
Dimensions: Inner diameter φ280mm
(4) Turning conditions Spindle speed 125rpm
Work peripheral speed 100m / min
Cutting depth 1-1.2mmφ (tolerance)
Feeding speed 0.1mm / rev
Roll pressure 10kgf
Peripheral pressure roll 3 equal pressure pressure 2.0kgf
[0027]
Under the above conditions, a total of 30 workpieces were respectively turned by the rotary machining apparatus 1 of the present invention and the apparatus configuration according to the conventional method for directly chucking the workpiece. As a result, the following results were obtained.

[0028]
As is clear from the above results, according to the rotary machining apparatus 1 of the present invention, it is possible to greatly reduce uneven thickness to about 1/3, and there is a particularly remarkable effect in improving uneven thickness. There was found. In addition, the roundness is in a range that can be sufficiently corrected by grinding at a low level substantially equal to that of the comparative example according to the conventional method.
[0029]
【The invention's effect】
The rotary processing apparatus and the rotational processing method for a ring-shaped workpiece according to the present invention chuck an inlay-type housing with a chuck claw, store the workpiece in the inlay-type housing, and use an outer peripheral pressure roll to inlay. Processing is performed by pressing against one inner wall surface of the mold housing and elastically pressing against the inner wall surface of the inlay mold housing by a side pressure roll. Therefore, the workpiece can be processed with high accuracy while maintaining high roundness without being chucked directly by the chuck claw, without being deformed in a distorted manner, and without causing uneven thickness by the processing tool.
In addition, the workpiece is pressed against the spigot housing by the outer peripheral pressure roll, and is elastically pressed against the inner wall of the spigot housing by the side pressurization roll, so that the rotational torque during rotary processing is transmitted reliably. In addition, the processing accuracy can be improved without slipping the workpiece.
[Brief description of the drawings]
FIG. 1 is a front view showing a configuration in an embodiment of a rotary machining apparatus according to the present invention.
FIG. 2 is a plan view showing the configuration of the rotary machining apparatus of FIG.
FIG. 3 is a perspective view showing a state in which a workpiece is attached to an inlay type housing.
FIG. 4 is an explanatory view showing the shape of a spigot housing.
FIG. 5 is an explanatory view showing a state in which a workpiece housed in an inlay-type housing is pressed by an outer peripheral preload roll.
FIG. 6 is a view showing another configuration in which three side pressure rolls are formed.
FIG. 7 is an explanatory diagram showing a state in which grinding is performed using a grinding wheel as a processing tool.
FIG. 8 is a front view showing a configuration of a conventional lathe device.
FIG. 9 is a plan view showing a configuration of a conventional lathe device.
FIG. 10 is an explanatory diagram showing a gripping state of a workpiece.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotation processing apparatus 10 Chuck 11 Inlay type housing 12 Work piece 17 Side pressure roll 20 Bit 26 Outer periphery pressure roll 30 Grinding wheel

Claims (2)

In the rotary processing device for the ring-shaped workpiece, the workpiece is attached to the spindle via the chuck and rotated, and the inner peripheral surface of the ring-shaped workpiece is processed by a processing tool.
An annular wall is formed on the outer peripheral portion, and the outer surface is pressed toward the center of the main shaft against the inner housing held by the chuck and held by the chuck on the inner side of the inner wall of the inner housing. An outer peripheral pressure roll, and a side pressure roll that presses the side surface of the workpiece opposite to the inlay housing to the inlay housing side,
An apparatus for rotating a ring-shaped workpiece, wherein the workpiece is processed by the processing tool at a position on an inner peripheral surface side of a position where the outer peripheral pressure roll of the workpiece contacts. In the rotational processing method of the ring-shaped workpiece in which the workpiece is attached to the spindle via the chuck and rotated, and the inner peripheral surface of the ring-shaped workpiece is processed by a processing tool.
An inlay type housing having an annular wall formed on the outer peripheral portion is gripped by the main shaft by the chuck, the workpiece is stored inside the inner wall of the inlay type housing, and the outer peripheral surface thereof is moved toward the main shaft center by an outer peripheral pressure roll. While pressing, the outer peripheral pressure roll of the work piece abuts in a state where the side surface of the work piece opposite the spigot housing is pressed by the side pressure roll to the spigot housing side. A method of rotating a ring-shaped workpiece, wherein the position on the inner peripheral surface side of the position is processed by the processing tool.

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