JP5352247B2 - Grinding equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding machine which enables outer diameter grinding while using grinding end surfaces of a workpiece as a reference. <P>SOLUTION: When a shaft-like workpiece with its end surfaces grinding-finished, is ground, the workpiece is supported by two centers, and one end of the workpiece is brought into press-contact with an end surface member equipped on the end side, and is also attracted by an electromagnetic chuck. Hence, the workpiece is firmly gripped by the grinding machine, and is ground so as to have outer diameter coaxiality and shape precision, while using the ground end surfaces of the workpiece as the reference. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a grinding apparatus for grinding a workpiece with a grindstone.

In a conventional grinding apparatus for polishing a cylindrical outer peripheral surface of a workpiece, a turning tool called a thread attached to the workpiece is used for the purpose of transmitting rotation of the spindle of the processing apparatus. Since this crack is fixed to the protruding portion of the work with screws, there is a problem that the outer peripheral surface of the protruding portion of the work can be damaged by screwing. In addition, in the case of a work having almost no protruding portion, there is a problem that the knurl cannot be attached to the work.
In view of this, Patent Document 1 discloses a grinding apparatus that supports a cylindrical workpiece at both centers and transmits a rotational force with a vignetting magnetic force. That is, this grinding apparatus abuts the end face of the flange portion of the work in a coaxial state with an annular end face, and fixes the work and the face by the magnetic force of a magnet disposed on the annular end face. Is.

JP 2002-103217 A

However, in the grinding device of Patent Document 1, since the rotational driving force for the workpiece is given only by the magnet, the workpiece and the slippery slip easily when rotated, and as a result, the processing wheel width in the workpiece cannot be increased, There is a problem that the amount of cut of the work due to cannot be obtained.
Furthermore, when fixing the workpiece to the kerf, the machining rotation center in the longitudinal direction cannot be determined on the workpiece end surface, so it is misaligned with the workpiece axis center, and the shape accuracy with respect to the workpiece machining end surface cannot be obtained. is there.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a grinding apparatus capable of performing an outer diameter grinding process based on a grinding end face of a workpiece. Is.

In order to achieve the above object, the invention according to claim 1 of the present invention is a spindle work having a spindle center for supporting a shaft-like work from one end face and an electromagnetic chuck for attracting the work by magnetic force. A support body and a tailstock work support body having a tailstock center for supporting the work piece from the other end face, and grinding the workpiece whose end face has been ground, wherein the tip face is An end surface member having a tip surface parallel to the end surface of the workpiece is provided at an end of the electromagnetic chuck having an open cylindrical shape, and the main shaft is accommodated in the center hole of the electromagnetic chuck at the center of the end surface member. A center is provided that can be projected and retracted from the end face member and is biased to a projecting position from the end face member by a biasing means. The workpiece is moved to the workpiece support side so that both end surfaces of the workpiece are supported by the spindle center and the tailstock center, and the end surface of the workpiece on the spindle workpiece support side is pressed against the tip surface of the end member. The workpiece is attracted to the spindle workpiece support by the electromagnetic chuck, the frictional force due to the support of the workpieces at both centers, the frictional force due to the pressure contact of the end surface of the workpiece with the end surface member, and the electromagnetic chuck. The workpiece is centered and fixed by a resultant force with a magnetic attraction force .

  According to a second aspect of the present invention, the ends of the spindle center and the tailstock center are tapered, respectively, and the tapered center holes in which the opposite ends are fitted to both end faces of the workpiece. It is characterized by providing each.

  The invention according to claim 3 is characterized in that the end face member is a cylindrical body that is provided so as to be detachable from the spindle work support, and a tip end face that contacts the work end face is annular. .

According to the first aspect of the present invention, even a shaft-like workpiece that cannot be rotated only by the magnetic force attracting force by the electromagnetic chuck can be combined with the support by both shaft centers and the pressure contact by the end face member. It becomes possible to rotate by adding the frictional force.
According to the invention described in claim 2, the spindle center and the tailstock center formed in a tapered shape are respectively fitted into the center holes provided in the workpiece, whereby the workpiece axis center and the machining center are processed. The center of rotation can be easily made concentric. Therefore, it is possible to perform a grinding process with which the outer diameter coaxiality and the shape accuracy can be obtained by using the ground end face of the workpiece as a reference plane.
Furthermore, according to the third aspect of the present invention, the frictional force on the workpiece can be maximized by forming the projecting surface of the end surface member in contact with the workpiece in an annular shape. Further, by using an end face member whose outer diameter is smaller than the outer diameter of the workpiece, the grindstone can be accessed to the end of the workpiece, and the entire outer diameter of the workpiece can be ground.

It is explanatory drawing which showed the state of the grinding-work apparatus before performing a grinding process. It is an enlarged view of a floating unit. (a) And (b) is the front view and left view which show an end surface plate. FIG. 2 conceptually shows an embodiment of the center support of the present invention, in which (a) shows a state in which the center is attached to the center hole, (b) shows a state in which the center is supported by both centers, and (c) shows an end face plate of the workpiece. It shows the state of pressure contact.

  Embodiments according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a view showing a grinding apparatus provided with a double-axis center. FIG. 2 is an enlarged view of the spindle work support of FIG. FIG. 3 is a front view and a left side view of the end face member, and FIG. 4 is an explanatory view showing the operation content when the workpiece contacts the end face member.

In FIG. 1, a center hole 6a is provided in an end surface 6A of a cylindrical workpiece 6, and a center hole 6b is provided in an end surface 6B. Further, the main shaft 1 is rotatably supported on the main shaft base 8 by bearings 8a, 8a,... A main shaft rotor (not shown) is mounted and fixed, and is driven to rotate. Furthermore, an electromagnetic chuck 2 is provided at the tip of the main shaft 1.
The electromagnetic chuck 2 has a cylindrical shape with an open front end surface, and a removable end surface plate (end surface member) 3 is provided at the front end portion 2 a of the electromagnetic chuck 2. As shown in FIGS. 1 to 3, the main body of the end face plate 3 is formed of a substantially half-width cylinder of the front end portion 2 a of the electromagnetic chuck 2. doing. Further, the end surface plate 3 has an annular projecting portion 3 a that protrudes in the coaxial direction from the front end surface, and the end surface 3 b of the annular projecting portion 3 a is a flat surface so as to be in close contact with the end surface 6 A of the workpiece 6. Is formed.

Further, a holding cylinder 10 of a floating center (main spindle center) 4 is attached to the electromagnetic chuck 2. As shown in FIG. 2, the holding cylinder 10 is a substantially cylindrical member having a base end face that is fully open and a circular opening at the center of the tip face. A flange portion 10a that engages with 2a is provided around.
In addition, a floating center 4 whose rear end portion has a large-diameter flange portion 4b is accommodated inside the electromagnetic chuck 2 so as to be able to protrude and retract from the end face plate 3, and between the floating center 4 and the bottom portion of the electromagnetic chuck 2. Is provided with a biasing spring (biasing means) 13 to bias the floating center 4 forward. However, the front wall portion 10 b of the holding cylinder 10 is engaged with the flange portion 4 b of the floating center 4, so that the protrusion of the floating center 4 is regulated at the forward position where the tip protrudes from the end face plate 3.
The floating center 4 is configured such that the tip conical surface 4 a engages with the center hole 6 a on the end surface 6 A side of the workpiece 6 to support the workpiece 6. The electromagnetic chuck 2, the pressing cylinder 10, the end face plate 3, and the floating center 4 constitute a floating unit (spindle workpiece support) 12.

The tailstock center 5 is inserted into and attached to the rotary tailstock shaft 7, and is rotatably supported by bearings 7a, 7a,. The tip 5a of the tailstock center 5 is engaged with the center hole 6b on the end surface 6B side of the workpiece 6 to support the workpiece 6. A tailstock 9 (tailstock work support) 16 is configured by adding a tailstock 9 to the tailstock center 5 and the rotating tailstock 7.
The main shaft rotor, main shaft 1, floating center 4, tailstock center 5 and rotary tailstock 7 are arranged on the same axis.

  The process of grinding the workpiece 6 using such a grinding device 15 will be described below with reference to FIGS.

  First, as shown in FIG. 4A, the center hole 6a of the workpiece 6 is looked into the tip 4a of the floating center 4, and then the tailstock center 5 is moved in the axial direction. Then, as shown in FIG. 4B, after the workpiece 6 is supported by the centers 4 and 5 of the tailstock center 5 and the floating center 4, the workpiece axis center is set by the support force of the centers 4 and 5. Centered to the center of the processing rotation axis. When the center of the work 6 is further advanced in a state where the center of the work 6 is maintained by both the centers 4 and 5, the end surface 6A of the work 6 is provided with an annular protrusion of the plate 3 as shown in FIG. It press-contacts to the end surface 3b of the part 3a. The workpiece 6 is magnetically attracted by the electromagnetic chuck 2.

Due to the urging force of the floating center 4 and the tailstock center 5, friction due to pressing is generated between the corresponding center holes 6 a and 6 b. In addition, since the annular projecting portion 3a is in pressure contact with the workpiece end surface 6A, friction also occurs between these members. That is, the workpiece 6 is firmly held by these two frictional forces and the magnetic force attracting force by the electromagnetic chuck 2.
In this state, the work 6 is rotated by transmitting the rotational driving force of the spindle motor to the work 6 via the floating center 4. Then, the cylindrical grinding surface of the rotating grindstone is cut in the radial direction while abutting against the cylindrical surface of the rotating workpiece 6 to perform grinding.

(Effect of Example)
According to the grinding device 15 described above, even with respect to the workpiece 6 that could not be rotated only by the magnetic force attracting force by the electromagnetic chuck 2, the frictional force due to the support of the workpiece 6 of both the centers 4 and 5, By adding a frictional force by pressure contact to the plate 3, it can be rotated.
Further, by combining the floating center 4 with the electromagnetic chuck 2, it is possible to easily make the workpiece axis center and the machining rotation center concentric. Therefore, it is possible to perform grinding with the outer diameter coaxiality and the shape accuracy using the ground end face of the workpiece 6 as a reference surface.
Furthermore, according to the grinding device 15 described above, the frictional force generated between the workpiece 6 and the workpiece 6 is maximized by forming the projecting surface 3b of the annular projecting portion 3a contacting the workpiece 6 in an annular shape. Can do.

Then, by selecting the end face plate 3 in which the outer diameter of the annular projecting portion 3a is smaller than the outer diameter of the workpiece 6, the grindstone can be accessed to the end of the workpiece 6, and the entire outer diameter of the workpiece 6 can be ground. it can. Further, the end face plate 3 can be selected and changed every time the size of the workpiece 6 to be processed is changed.
Furthermore, since the grinding device 15 described above can be used without being integrated with the workpiece 6 due to the support by the centers 4 and 5, the press contact by the annular projecting portion 3 a, and the magnetic force by the electromagnetic chuck 2 at the time of processing work. There is no need to perform attachment and detachment work before and after the processing work, and there is an advantage in that it is efficient when used in a line.

(Change example)
In the present embodiment, the end face plate 3 adopts a complete ring shape, but it is not necessarily required to be a complete ring shape, and may have a cut or the like. However, the frictional force generated between the workpiece 6 and the workpiece 6 can be increased by increasing the contact area as much as possible.
In the embodiment of the present invention, both centers 4 and 5 are supported, and one center 4 is rotationally driven. The other center 5 is ground while the workpiece 6 is fixed. , 5 and the centers 6 and 5 can be rotated synchronously to rotate the workpiece 6. In this case, even if a load from the grindstone is applied to the workpiece 6 during grinding, both the centers 4 and 5 and the workpiece 6 rotate together, so that the slip between the centers 4 and 5 and the workpiece 6 does not easily occur. .

  2 .... Electromagnetic chuck, 3 .... End plate, 4 .... Floating center, 5 .... Tailstock center, 6 .... Workpiece, 12 .... Floating unit, 15 .... Grinding unit, 16 .... Tailstock unit .

Claims (3)

A spindle work support having a spindle center for supporting a shaft-like workpiece from one end face, and an electromagnetic chuck for attracting the workpiece by magnetic force;
A tailstock work support having a tailstock center for supporting the work from the other end face, and grinding the work whose end face has been ground.
An end surface member having a tip surface parallel to the end surface of the workpiece is provided at the end of the electromagnetic chuck having a cylindrical shape with an open end surface, and is accommodated in the center hole of the electromagnetic chuck at the center of the end surface member. The main shaft center can be projected and retracted from the end surface member and biased to a projecting position from the end surface member by a biasing means;
When supporting the work, the tailstock work support is moved to the main spindle work support, both end surfaces of the work are supported by the main spindle center and the tailstock center, The spindle work support side end face is brought into pressure contact with the tip face of the end face member, the work is attracted to the spindle work support by the electromagnetic chuck, and the friction force due to the support of the work at both centers, the work A grinding apparatus characterized in that the work is centered and fixed by a resultant force of a frictional force caused by press-contacting an end face to the end face member and a magnetic force attracting force by the electromagnetic chuck .   The ends of the spindle center and the tailstock center are tapered, respectively, and tapered center holes are provided on both end faces of the work so that the opposing tips are fitted to each other. The grinding apparatus according to claim 1.   3. The grinding according to claim 1, wherein the end surface member is a cylindrical body that is provided so as to be detachable from the spindle work support and has a tip end surface that comes into contact with the work end face. Processing equipment.

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