JPH0413076Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for holding a workpiece on a carrier and grinding both end faces of the workpiece in a vertical shaft double-head grinding machine.

Purpose of the invention In a vertical shaft double-head grinding machine, the workpiece is generally held on a disc-shaped carrier and is placed between an upper wheel and a lower wheel for grinding.

Figure 1 is a perspective view of a conventional vertical shaft double-head grinder.
An upper wheel 3 and a lower wheel 4 are arranged between a bed 1 and a column 2 on the upper surface of the bed. Reference numeral 5 denotes a disc-shaped carrier which holds the workpiece W and faces between the upper wheel 3 and the lower wheel 4 to grind both end faces of the workpiece. When grinding a workpiece W, especially when high precision is required for the flatness and parallelism of both end faces to be ground, the accuracy of the product may be affected due to thermal displacement of various parts of the grinding machine or uneven wear of the grinding wheel. It differs each time, and satisfactory accuracy cannot be obtained.

Means for Solving the Problems The present invention has a carrier arranged between an upper grinding wheel and a lower grinding wheel arranged coaxially, and a vertical shaft that grinds both end surfaces of a workpiece held by the carrier. In a double-head grinding machine, a workpiece jig for holding a workpiece is rotatably held in a carrier, and a carrier shaft that is integral with the carrier is outside the outer diameter of the upper and lower grinding wheels, and A drive means for rotating the carrier is connected to the carrier shaft, and an output shaft parallel to the axis of the carrier shaft is rotatably provided within the carrier shaft. This is a vertical shaft double-headed grinding device characterized in that one end of the grinding shaft is connected to a workpiece jig via a rotation transmission means provided in the carrier, and the other end of the output shaft is connected to a prime mover.

Embodiment In FIGS. 2 to 6, reference numeral 11 denotes a carrier according to the present invention, which has a concave surface 11a provided with a jig holding circular hole 11b, and a carrier lid 22 having a jig holding circular hole 22b. is installed. The carrier 11 and carrier lid 22
A jig 12 that holds the workpiece W in each jig holding circular hole.
is held rotatably. A gear 16 is provided protruding from a shoulder portion 12a on the outer periphery of the jig 12.
The outer peripheral shoulder portion 12a of the jig 12 has a jig holding circular hole 11.
It is supported by the concave surface 11a of the carrier around b and the inside 22a of the carrier lid 22. Next, the outer peripheries of the guide rollers 13, 13 supported between the carrier 11 and the carrier lid 22 are brought into contact with two shoulders 12a of the jig 12 on the side that does not receive the rotational transmission force. The guide roller 13 is supported on a shaft 17 by a bearing 14, and pins 17' at both ends are held by a carrier 11 and a carrier lid 22. 15 is an intermediate gear that transmits the rotation of the output shaft 19 to the jig 12, and a bearing 14 is attached to the shaft 17a.
pins 17'a at both ends of the shaft are held by a carrier 11 and a carrier lid 22. A pinion 18 is fixed to the upper end of the output shaft 19, and when driven, the pinion rotates the jig 12 via the intermediate gear 15. 21 is a carrier shaft concentric with the output shaft 19 and connected to the carrier 11.

In this embodiment, the jig is rotated by a driving means in which the intermediate gear 15 is meshed with the pinion 18 of the output shaft, and the jig gear 16 is meshed with the intermediate gear 15, but the intermediate gear is omitted and the pinion of the output shaft is rotated. The jig gear may be directly engaged with the jig gear. Prime mover 27 fixed to bed 1
The rotation is transmitted from the wheel 26 to the wheel 25 at the lower end of the output shaft 19, and via the output shaft 19, the pinion 18 on the output side is rotated. The prime mover 27 may be attached directly to the carrier shaft 21 in addition to the bed.
In this case, wheels 25, 26 are not required. The output shaft 19 is located inside the axial center of the carrier shaft 21 and is supported by bearings 20, 20a. 22c indicates a screw for fixing the carrier lid to the carrier.

The carrier shaft 21 is rotatably supported by bearings 23, 23 of a bearing block 28 fixed to the bed, and a carrier gear 24 controls the grinding position of the jig 12 of the carrier 11 and the loading position of the workpiece to the carrier shaft 21. Rotate in an arc as shown by arrow X to obtain their positions. A drive device for rotating the carrier gear 24 and a carrier table in the loading position are not shown. The carrier gear 24 is also used for oscillation when the carrier 11 is moved back and forth between the upper and lower grinding wheels during grinding.

Reference numeral 29 shown in FIG. 5 is a protruding piece disposed on a part of the work-holding peripheral wall of the jig 12, and is a rotation stopper that protrudes into the recess 30 of the workpiece so that the workpiece and jig can rotate together. It is a means. In FIG. 6, an elastic seal or packing material is applied as a rotation stopper 31, and rotation is prevented by friction with the workpiece W. This is effective when the workpiece W has a circular outer shape. For non-circular workpieces, if the jig has a peripheral surface that matches the shape of the workpiece, the above-mentioned rotation stopper is not necessary. These detents are also utilized in other embodiments described below.

7, 8, and 9 show other embodiments. In this embodiment, a plurality of jigs (two in the drawing) are placed on the carrier 11, and the jig 1 is connected to the output shaft 19.
2, the rotation is transmitted by chain transmission (belt transmission may also be used). Of course, these may be gear transmissions as in the previous embodiment. The outer periphery of the jig 12 is a sprocket wheel, which is driven by a chain 34 from a drive wheel 33 on the output shaft 19. 13a is a guide roller that is brought into contact with the wheel shoulder of the jig 12 at two points on the semicircumference, and is pivotally supported by a shaft 17b with a bearing 14b.
supported within the carrier. Guide roller 13a
This prevents the jig wheel from being pulled in one direction by the chain when it is being driven.
The installation of the jig wheel 32 into the carrier takes place in the same way as for the gear transmission described above. In order to rotate the drive wheel 33, the carrier shaft 21
A plurality of output shafts 19 are arranged equally in the inside a, and are supported by bearings 20b and 20c. Each prime mover 27 for the plurality of output shafts 19 is
It is fixed to a carrier shaft 21a, and the output shaft 19 is driven by wheels 25 and 26. The carrier shaft 21a is connected to the bearing 23 of the bearing block 28 as in the case of FIG.
It is pivotally supported by a and 23a. 35 is the carrier shaft 21
The wheel latched to a moves the carrier alternately between the grinding position and the loading position as shown by arrow Y, and is associated with a drive system that performs oscillation during grinding. The prime mover of this drive system is attached to the bed, but is not shown. 36 indicates a part of the carrier table that supports the carrier workpiece.

FIG. 10 shows a design example for a single jig with chain transmission of the embodiments of FIGS. 7 to 9, in which the prime mover 27 is mounted on the carrier 11.

Operation In FIGS. 2 and 3, after setting the recess 30 of the workpiece W in the rotation stopper 29 of the jig 12 of the carrier 11 which is in the loading position shown by the solid line, the prime mover 27 is driven to set the output shaft. When the pinion 19 is rotated, the pinion 18 is rotated, and the jig 12 is rotated via the intermediate gear 15.

After this, the carrier 11 is passed through the carrier gear 24 by a carrier rotating prime mover (not shown).
It is rotated in an arc toward the wheel wheels 3 and 4 as shown by arrow X.
It enters between the upper wheel 3 and lower wheel 4 as shown by the imaginary line and undergoes grinding. The rotational direction of the grinding wheel and the rotational direction of the workpiece during grinding are not particularly limited, and each rotational direction may be determined according to the grinding conditions. If the carrier 11 is oscillated by the carrier gear 24 during grinding, the machining accuracy can be further improved. When the grinding is finished, the carrier 11 is returned to its original loading position and the workpiece W is replaced.

The operation of the embodiment of FIG. 10 is performed in accordance with the operation described above. In the embodiments shown in FIGS. 7 and 8, the workpiece W is attached and detached while the jig is stopped rotating at the loading position on the opposite side of the grinding wheel.
If the carrier 11 is ground by half a rotation, the efficiency will be improved compared to the case of using a single jig.

Effects The present invention is applicable to a vertical shaft double-end grinding machine in which a carrier is arranged between an upper wheel and a lower wheel that are arranged coaxially, and which grinds both end surfaces of a workpiece held by the carrier. A workpiece jig for holding a workpiece is rotatably held inside the workpiece, and a carrier shaft that is integral with the carrier is located outside the outer diameter of the upper and lower grinding wheels and is connected to the shaft of the grinding wheel. A driving means for rotating the carrier is connected to the carrier shaft, and an output shaft parallel to the axis of the carrier shaft is rotatably provided within the carrier shaft, and one end of the output shaft is connected to the carrier shaft. The other end of the output shaft is connected to the prime mover, so that the workpiece can be rotated between the upper and lower wheel. The workpiece can be rotated on its own axis, so that the workpiece comes into equal contact with the abrasive grains on both the grinding surface on the outer periphery and the grinding surface on the inner periphery of the grinding wheel. There was no difference in wear between the inner and outer circumferential parts, and high accuracy in flatness and parallelism of both end faces of the workpiece to be ground was achieved even though the number of dressings was reduced.

By the way, (a) stop the rotation of the workpiece jig,
A comparison between the case of grinding without a rotation stopper and (b) the case of rotating the workpiece jig and grinding with a rotation stopper provided, shows that (b) is better in terms of parallelism and dimensional difference. (b) was also superior in terms of surface roughness.

Moreover, since it is possible to oscillate around the carrier axis in addition to the rotational movement, machining accuracy is further improved.

Furthermore, an output shaft having an axis parallel to the carrier shaft is provided within the carrier shaft, and one end of this output shaft is connected to a workpiece jig and driven to rotate, thereby driving rotational motion and oscillating motion. Since both are performed from the same axis, double-head surface grinding with high flatness can be performed without uneven wear on the workpiece.

Furthermore, since the output shaft is provided within the carrier shaft, the space for the shaft can be reduced, making it possible to downsize.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of one of the conventional vertical shaft double-end grinding machines, Fig. 2 is a plan view of the device of the present invention, Fig. 3 is a partially vertical front view of Fig. 2, and Fig. 4 is a A- in the diagram
An enlarged sectional view taken along line A, FIG. 5 is a plan view of a portion of the rotation stopper, FIG. 6 is a sectional view of another rotation stopper, FIG. 7 is a plan view when there is a plurality of jigs, and FIG.
9 is an enlarged sectional view of the right half of FIG. 7, and FIG. 10 is a vertical sectional view of the main part of another embodiment. 3... Upper grinding wheel, 4... Lower grinding wheel, 11...
...Carrier, 12...Jig, 13...Guide roller, 15...Intermediate gear, 18...Pinion, 19
... Output shaft, 21 ... Carrier shaft, 24 ... Carrier gear, 29, 31 ... Rotation prevention means.

Claims (1)

[Scope of Claim for Utility Model Registration] In a vertical shaft double-end grinding machine in which a carrier is arranged between an upper wheel and a lower wheel which are coaxially arranged, and which grinds both end surfaces of a workpiece held by the carrier. A workpiece jig for holding a workpiece is rotatably held in the carrier, and the carrier shaft, which is integral with the carrier, is outside the outer diameter of the upper and lower grinding wheels, and A driving means for rotating the carrier is connected to the carrier shaft, and an output shaft parallel to the axis of the carrier shaft is rotatably provided within the carrier shaft, and one end of the output shaft is A vertical shaft double-headed grinding device, characterized in that the grinding device is connected to a workpiece jig via a rotation transmission means provided in the carrier, and the other end of the output shaft is connected to a prime mover.