JPH0723152Y2 - Magnet chuck device in grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a magnetic chuck device for attracting and holding a work.

(Prior Art) Conventionally, when the shape of the work is longer in the longitudinal direction than the thickness, the most difficult thing to perform in the grinding process is to remove the work strain generated during the heat treatment or the rough work of the work. That is, the work is deformed by the attraction force of the magnet chuck device that attracts and holds the work, and when the excitation of the magnetic poles in the magnet chuck device is released (demagnetized), machining strain appears again.

Therefore, in order to avoid the above phenomenon, grinding is performed with the attraction force of the magnet chuck device being intentionally weakened, or shims or the like are inserted in the deformed portion due to processing distortion, and the work is inverted many times to perform processing. .

(Problems to be solved by the invention) By the way, in the above-described conventional processing strain removing means, when the attraction force of the magnet chuck is intentionally weakened, the work is separated from the magnet chuck due to the grinding conditions and the like, and there is a safety problem. there were. In addition, when a shim is inserted into a deformed portion of a workpiece for machining, a lot of machining time and labor are required, resulting in poor efficiency and inability to improve productivity.

The purpose of the present invention is to improve the above-mentioned problems, in order to eliminate the distortion without changing the attraction force of the magnet chuck device and without inserting the shim, ensuring safety and labor-saving productivity, product An object is to provide a magnet chuck device with improved quality.

[Structure of the Invention] (Means for Solving the Problem) In order to solve the above-mentioned conventional problems, in the present invention, a table on which a work is placed is provided, and the upper surface of the table can be switched between excitation and demagnetization. Many magnetic poles are buried,
A large number of support holes are provided on the upper surface of the table, and support pins for supporting the work are provided in the respective support holes so as to be vertically movable.
Biasing members capable of urging the support pins upward are provided below the support pins in the respective support holes, and the support pins are configured to protrude from the upper surface of the table before supporting the work. A through hole communicating with the outside of the table is provided near the bottom of each support hole.

(Operation) In the above configuration, the work is placed on the table. Here, when the lower surface of the work is parallel to the upper surface of the table, the plurality of support pins located below the work among the plurality of support pins respectively resist the biasing force of the biasing member. It descends and sinks downward with respect to the upper surface of the table. On the other hand, when the lower surface of the work is not parallel to the upper surface of the table due to the work distortion of the work, the plurality of support pins are lowered by a predetermined amount according to the shape of the lower surface of the work, and the upper surface of the table is attached to the work. A floating part arises.

Then, by exciting the magnetic pole, the work can be attracted and held on the table by the action of the magnetic force. Here, when the lower surface of the work is not parallel to the upper surface of the table, the part of the work that floats from the upper surface of the table tends to be attracted to the upper surface of the table by the action of magnetic force and forcibly deformed downward. However, since the floating portion of the work is biased upward by the plurality of support pins, the amount of downward deformation of the floating portion can be minimized.

After adsorbing and holding the work on the upper surface of the table, it is possible to make the upper surface of the work parallel to the upper surface of the table while appropriately ejecting the grinding liquid to the work and appropriately grinding the work. it can. Here, even if the grinding liquid enters the support hole, the grinding liquid can be discharged from the through hole to the outside of the table.

After grinding the work, a large number of magnetic poles are demagnetized to release the suction-holding state of the work. At this time, as described above, the amount of downward deformation of the floating portion of the work due to the action of the magnetic force is made as small as possible, so that the amount of upward restoration of the floating portion can be made as small as possible.

(Example) Referring to FIG. 2, a plurality of magnetic poles 3 are embedded in the horizontal direction in FIG. 2 in a table 1 which constitutes a part of a magnet chuck device of a grinder. A large number of machining strain eliminating devices 5 are embedded between the magnetic poles 3, and the support pins 7 constituting the machining strain eliminating device 5 are in contact with the lower surface of the work W.

In the above configuration, when the work W having a processing distortion is placed on the magnet chuck 1, the work W does not uniformly contact the surface of the chuck 1 due to the processing distortion, and the distorted portion floats up. When the magnetic pole 3 is excited in that state, an attractive force is generated and the work W is held by the magnet chuck 1.
However, at this time, the deformation of the work W is alleviated by the support pin 7 of the processing strain removing device 5.

The processing strain removing device 5 will be described in more detail.

Referring to FIG. 1, a processing strain removing device 5 embedded in a table 1 (partly not shown) is installed in stepped holes (support holes) 9 provided in a plurality of places provided in the table 1. ing. A biasing member 13 (coil spring or the like) is attached to the small diameter portion 11 of the stepped hole 9, and a sleeve 17 is fitted to the large diameter portion 15. A stepped hole 21 having a stepped portion 19 is provided in the center of the sleeve 17, and a large diameter portion 23 of the stepped hole 21 is a small diameter portion of the stepped hole 9.
A base 27 of the support pin 7 having the same diameter as 11 and a shoulder 25 is vertically movably inserted.

The tip portion 31 of the support pin 7 is inserted into the small diameter portion 29 of the stepped hole 21 provided in the sleeve 17, and the tip portion of the support pin 7 is inserted.
The surface of 31 that contacts the work W forms a hemispherical surface 33.
Further, the sleeve 17 is provided with a withdrawal screw hole 35, and a through hole 39 communicating with the outside of the table 1 is provided near the bottom 37 of the small diameter portion 11 of the stepped hole (support hole) 9. .

In the above configuration, the work W placed on the table 1
Are partially in contact with the surface of the table 1 due to processing strain in the previous step. In this state, the support pin 7 located at a position (lower position) corresponding to a portion (a portion floating from the upper surface of the table 1) that does not come into contact with the surface of the table 1 due to processing strain of the work W has a built-in biasing member. The work W is in contact with the urging force of 13.

When the magnetic pole 3 is excited in the above state, the support pin 7 stops at a position following the distorted shape of the work W. Since the tip of the support pin 7 has a hemispherical surface 33, it is in point contact with the work W, so that it is not unreasonably supported.

Further, the upper surface of the sleeve 17 is slightly depressed from the upper surface of the magnet chuck 1 so as not to be an obstacle when the work W is moved. Through hole provided in the small diameter portion 11 of the stepped hole 9
Reference numeral 39 is a discharge port for grinding water and the like that has entered the inside of the mechanism, which is opened on the side surface of the table 1 and serves as an air vent inside the mechanism to smooth the movement of the support pin 7. Further, the shoulder portion 25 of the support pin 7 contacts the step portion 19 of the stepped hole 21 provided in the sleeve 17 to prevent the support pin 7 from coming off. When the upper surface of the magnet chuck 1 is ground or the like, the sleeve 17 can be removed by using the screw hole 35.

As described above, the work W can be held in the distorted shape by the support pin 7. Therefore, the machining strain can be efficiently removed during machining, and it is not necessary to insert the shim, so that much machining time and labor can be saved and productivity can be improved. Also, the magnet chuck 1
Since it is not necessary to weaken the suction force of, the safety can be improved without the work coming off.

The operation of this embodiment is summarized as follows.

The work W is placed on the table 1. Here, when the lower surface of the work W is parallel to the upper surface of the table 1, the plurality of support pins 7 located below the work W among the plurality of support pins 7 are respectively attached to the biasing member 13. It descends against the biasing force and sinks downward into the upper surface of the table 1. On the other hand, when the lower surface of the work W is not parallel to the upper surface of the table 1 due to the processing strain of the work W, the plurality of support pins 7 are lowered by a predetermined amount according to the shape of the lower surface of the work W, respectively. A part of W floats from the upper surface of the table 1.

Then, by exciting the magnetic pole 3, the work W can be adsorbed and held on the table 1 by the action of the magnetic force. Here, when the lower surface of the work W is not parallel to the upper surface of the table 1, the part of the work W floating from the upper surface of the table 1 is attracted to the upper surface of the table 1 by the action of the magnetic force and is forced downward. However, since the floating portions of the work W are urged upward by the plurality of support pins 7, the downward forced deformation of the floating portions is minimized. can do.

After adsorbing and holding the work W on the upper surface of the table 1, while appropriately ejecting the grinding liquid onto the work W, the work W
The upper surface of the work W can be made parallel to the upper surface of the table 1 by performing an appropriate grinding process with respect to. Here, even if the grinding liquid enters the support hole 9, the grinding liquid can be discharged from the through hole 39 to the outside of the table 1.

After grinding the work W, a large number of magnetic poles 3
Is demagnetized to cancel the suction holding state of the work W. At this time, as described above, the amount of downward deformation of the floating portion of the work W due to the action of the magnetic force is made as small as possible, so that the amount of upward restoration of the floating portion can be made as small as possible.

According to the invention of this embodiment as described above, when the work W has a processing strain and the lower surface of the work W is not parallel to the upper surface of the table 1, the work W is placed on the table 1 Although a floating portion is generated from the upper surface of the work 1, since the floating portion of the work W is biased upward by the biasing member 13, the magnetic force acts on the work W.
Even if is sucked and held on the table 1, the amount of downward deformation of this floating portion can be minimized. Therefore, when the suction holding state of the work W is released after the grinding process, the upward restoration amount of the floating portion of the work W can be reduced, and the parallelism of the upper surface of the work W with respect to the upper surface of the table 1 can be reduced. Can be maintained under high precision. Therefore, grinding work is performed on the work W having a working strain without weakening the attraction force of the work W or using a shim, while avoiding the complicated structure and operation of the magnet chuck device. The accuracy can be improved.

Further, since the through holes 39 communicating with the outside of the table 1 are provided near the bottoms of the support holes 9, it is possible to avoid the accumulation of the grinding fluid in the support holes 9 as much as possible, and at the same time, in the support holes 9. It is possible to bleed air.
Therefore, it is possible to reduce the failure of the support pin 7 and the urging member 13 and prolong the life thereof, and it is possible to appropriately maintain the up and down movable state of the support pin 7.

[Effects of the Invention] As will be understood from the above description of the embodiments, according to the present invention, when the lower surface of the work is not parallel to the upper surface of the table when the work processing distortion is present, When the table is placed on the table, a part floats from the upper surface of the table.However, since this part of the work is biased upward by the biasing member, the work is attracted and held on the table by the action of magnetic force. Also, the amount of forced deformation of the floating portion in the downward direction can be minimized.
Therefore, when the suction holding state of the work is released after the grinding process, the upward restoration amount of the floating portion of the work can be reduced, and the parallelism of the upper surface of the work with respect to the upper surface of the table can be accurately adjusted. Can be maintained below. Therefore, with respect to a work having a processing strain, without weakening the suction force of the work or using a shim, and further avoiding the complication of the configuration and operation of the magnet chuck device, the accuracy of the grinding processing is improved. It is possible to improve.

In addition, by providing through holes that communicate with the outside of the table near the bottom of each support hole, it is possible to avoid pooling of the grinding fluid in the support hole as much as possible, and to bleed air from the support hole. it can. Therefore, it is possible to reduce the failure of the support pin and the urging member and prolong the life of the support pin, and it is possible to appropriately maintain the up and down movable state of the support pin.

[Brief description of drawings]

FIG. 1 shows the main part of this device, and I- in FIG.
FIG. 2 is a side view of a magnet chuck device according to an embodiment of the present invention, which is a sectional view taken along line I. 1 ... Table, 3 ... Magnetic pole 5 ... Machining strain removing device, 7 ... Support pin 13 ... Biasing member

Claims (1)

[Scope of utility model registration request] 1. A table on which a work is placed is provided, a large number of magnetic poles that can be switched between excitation and demagnetization are embedded in the upper surface of the table, and a large number of support holes are provided in the upper surface of the table, and the work is supported in each support hole. The support pins are provided so that they can be moved up and down, and the biasing members that can bias the support pins upward are provided below the support pins in the respective support holes. Before supporting the workpiece, the support pins are provided on the upper surface of the table. And a through hole communicating with the outside of the table in the vicinity of the bottom of each support hole.