JPH11207578A - Double head surface grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed works from a feed position easily and quickly, ensure their steady posture at a grinding position, and grind both their end faces precisely under no influence of the tilting precision of grinding wheels. SOLUTION: The double head surface grinding machine uses a carrier 4, which is formed in its circumference with a plurality of pockets 3 spaced out circumferentially and is mounted on its circumference with a guide member 5 for holding works W between itself and the pockets 3 in the carrier 4 and guiding them such that they rotate at least at a grinding position B where they are passed between grinding wheels according to the rotation of the carrier 4. The carrier 4 and the guide member 5 are relatively positioned to have a small clearance on the side of the grinding position B and a large clearance on the side opposite thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided surface grinder for grinding both end faces of a workpiece such as a shaft.

[0002]

2. Description of the Related Art When grinding both end surfaces of a workpiece such as a shaft used for electronic equipment with a pair of grinding wheels of a double-sided surface grinder, the workpiece is mounted on a holding portion on an outer peripheral side of a carrier.
Each workpiece is sequentially ground while feeding the workpiece of each holding portion between a pair of grinding wheels by rotation of the carrier. Conventionally, for example, as described in JP-B-61-46243, a method of transporting a workpiece of this double-sided surface grinder is described below.
A holding hole is formed in the outer periphery of a disk-shaped carrier at equal intervals in the circumferential direction so as to penetrate therethrough, and a workpiece is inserted and mounted in the holding hole. 185
No. 1 and Japanese Utility Model Publication No. 5-8049, holding recesses are formed at equal intervals in the circumferential direction on the outer peripheral side of a disc-shaped carrier, and the holding recesses are formed between the holding recesses of the carrier. In some cases, a guide member is provided along the outer periphery of a carrier to hold and guide a workpiece.

[0003]

In the former transporting method, a holding hole is formed in a carrier, and the workpiece is inserted into the holding hole and held. The inner diameter of the holding hole is made slightly larger than the outer diameter of the workpiece so that it can be performed easily and quickly. However, this transport type has a drawback that the size of the gap between the holding hole and the workpiece directly affects the work efficiency and grinding accuracy of the grinding operation. That is, if the gap between the holding hole and the workpiece is increased, the posture of the workpiece becomes unstable when grinding both end faces of the workpiece at the grinding position, and the processing accuracy of the both end faces of the workpiece becomes low. descend. If the gap between the holding hole and the workpiece is reduced to stabilize the posture of the workpiece at the grinding position, the supply of the workpiece at the supply position becomes difficult, and the grinding swarf is formed by the holding hole. There is a disadvantage that it penetrates into the gap between the workpiece and the workpiece. Moreover, in this transport type, the workpiece cannot be positively rotated at the grinding position, so that even if the posture of the workpiece at the grinding position is stable, the inclination accuracy of the grindstone remains unchanged. There is a drawback in the processing accuracy of the workpiece, and it is not possible to grind both end faces of the workpiece with high accuracy so that both end faces are perpendicular to the outer diameter.

In the latter type of transport, the workpiece is supplied to the holding recess of the carrier and then transported while holding the workpiece between the holding recess of the carrier and the guide member. In addition, problems such as the stability of the posture of the workpiece at the grinding position can be solved. However, even in the latter transport type, when the workpiece is ground at the grinding position due to its structure, the workpiece cannot rotate. There is a disadvantage that it directly affects the processing accuracy of the workpiece and that the right angle accuracy of the end face with respect to the outer diameter of the workpiece cannot be sufficiently ensured. The present invention has been made in view of the above-described conventional problems, and can easily and quickly supply a workpiece at a supply position, secure the stability of the posture of the workpiece at a grinding position, and improve the inclination accuracy of the grinding wheel. It is an object of the present invention to provide a double-sided surface grinder capable of grinding both end faces of a workpiece with high accuracy without being affected.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a double-sided surface grinder for grinding both end surfaces of a workpiece W held by a carrier 4 with a pair of grindstones 1 and 2 in a circumferential direction around the outer periphery of the carrier 4. A plurality of pockets 3 are provided, and a workpiece W is provided outside the carrier 4 between the carrier 3 and the pocket 3.
And a guide member 5 for guiding the workpiece W to rotate at least at a grinding position B side where the workpiece W passes between the grindstones 1 and 2 with the rotation of the carrier 4. The gap on the grinding position B side between the shaft and the guide member 5 is reduced, and the gap on the side opposite to the grinding position B is increased.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 illustrate a first embodiment in which the present invention is applied to a horizontal double-ended surface grinder. As shown in FIGS. 1 and 2, this horizontal double-sided surface grinder has a pair of grinding wheels 1 and 2 and a plurality of pockets 3 for a workpiece W formed on concentric circles on the outer periphery. And a guide member 5 for holding and guiding the workpiece W between the carrier 4 and the pocket 3 of the carrier 4. Each whetstone 1 and 2 has a bearing case 6 and 7
A pair of horizontal grinding wheel shafts 8 and 9 rotatably supported by
And is driven in the direction indicated by the arrow Y by a driving device (not shown). Each of the grinding wheel shafts 8 and 9 is arranged on the same horizontal axis, or the other is slightly inclined with respect to one.

The carrier 4 is formed of a substantially circular disk. A plurality of teeth 10 are formed on the outer periphery of the carrier 4 at equal intervals in the circumferential direction. The space between the portions 10 is a pocket 3 in which a columnar workpiece W enters. The carrier 4 is fixed to the tip of a carrier shaft 11 arranged laterally near one side of one of the grinding wheels 8, and is arranged so that a part thereof is located between the pair of grinding wheels 1 and 2. The carrier shaft 11 is rotatably supported by a bearing case 12, and is rotationally driven by a driving device (not shown) so that the carrier 4 rotates in the direction indicated by the arrow X. The teeth 10 have a standard module shape of a spur gear as shown in FIG. The guide member 5 has a ring shape in which the guide surface 13 on the inner circumference side is a perfect circle, and a supply position A for supplying the workpiece W to the pocket 3 of the carrier 4 and the workpiece W Two
The grinding position (grinding area) B where both ends are ground by passing through the gap, and the workpiece W after grinding is placed in the pocket of the carrier 4.
The carrier 4 is fixed to a machine frame or the like by a fixing member (not shown) so as to surround the carrier 4 from the outside while straddling the discharge position C where the carrier 4 is discharged.

The guide member 5 includes a guide surface 13 and a carrier 4
So that the gap between the carrier shaft 11 and the feed position A on the side opposite to the grinding position B is small on the grinding position B side.
The workpiece W supplied to the pocket 3 of the carrier 4 at the supply position A is held between the pocket 3 and the
The workpiece W is guided from the supply position A to the discharge position C via the grinding position B while rotating about the axis of the workpiece W with the rotation of the workpiece. The gap at the grinding position B side is, as shown in FIG.
Is in contact with the lower tooth portion 10 and the guide surface 13 of the guide member 5 at two points. Therefore, the workpiece W
The workpiece W can easily rotate within the pocket 3 even if there is some variation in the outer diameter of the workpiece W.

[0009] In the horizontal double-sided surface grinding machine having the above structure,
When grinding both end faces of the workpiece W, the grinding wheels 1 and 2
The workpiece W is sequentially supplied to the pocket 3 of the carrier 4 from the supply position A while the carrier 4 is rotated in the direction of the arrow X, respectively. In this case, since the gap between the carrier 4 and the guide member 5 is large on the supply position A side, the workpiece W can be supplied to the pocket 3 easily and quickly. When the workpiece W is supplied to the pocket 3 at the supply position A, the workpiece W is guided by the guide surface 13 of the guide member 5 along with the rotation of the carrier 4, and is fed into the pocket 3 by friction with the guide surface 13. While rotating in the clockwise direction (Z arrow direction), it is conveyed in the X arrow direction, and is fed between the pair of grinding wheels 1 and 2 on the grinding position B side. On the grinding position B side, while the workpiece W held by the pocket 3 of the carrier 4 and the guide member 5 passes between the two grinding wheels 1 and 2 while rotating, the workpiece W is Are ground at right angles to the outer diameter.

At the grinding position B, the work piece is
When grinding both end faces of W, carrier 4 and guide member 5
Since the gap between the workpiece W and the guide surface 13 is small, the workpiece W can be reliably held in a predetermined posture by the carrier 4 and the guide member 5, and the posture of the workpiece W at the grinding position B side. Is very stable and machining accuracy is improved. In particular, since the carrier 4 is formed of a disc and the inner peripheral guide surface 13 of the guide member 5 is formed in a perfect circle, the carrier 4 and the guide member 5 are eccentric by a predetermined eccentric amount D. It is easy to manufacture the carrier 4 and the guide member 5, and
The relative position between the carrier 4 and the guide member 5 can be easily determined, and the posture of the workpiece W over the predetermined range on the grinding position B side where the workpiece W passes between the grindstones 1 and 2 is ensured. Can hold.

Since the workpiece W in the pocket 3 passes through the grinding position B while rotating, the intrusion of grinding swarf into the pocket 3 can be reduced. Since the gap on the side of A and the discharge position C is large, the gap can be easily removed by using appropriate means, and the problem due to grinding slag is less likely to occur. Moreover, the workpiece W in the pocket 3 rotates while rotating,
Since the workpiece W passes through the gap, both end faces of the workpiece W in the rotating state can be ground by the pair of grindstones 1 and 2. For this reason, it is difficult for the inclination accuracy of the grindstones 1 and 2 to appear as it is in the processing accuracy of the workpiece W as it is, and both end faces of the workpiece W can be ground with high accuracy so that both end faces are perpendicular to the outer diameter. Further, since the carrier 4 can be processed with a spur gear standard module using a hobbing machine or the like, the carrier 4 can be easily processed, and can be easily manufactured at low cost. Since the guide member 5 has a ring shape, the shape of the guide member 5 itself is constant, so that deformation and the like of the guide member 5 can be prevented, and its manufacture is easy.

FIG. 4 illustrates a second embodiment of the present invention,
The guide member 5 is formed in a C shape, and the discharge position C and the supply position
A cutout portion 14 is formed in the guide member 5 between itself and A. As described above, since there is no need to hold and guide the workpiece W by the guide member 5 between the discharge position C and the supply position A, the guide member 5 has a notch 14
It may be configured in a letter shape. FIG. 5 illustrates a third embodiment of the present invention, in which a guide member 5 is rotated in a direction opposite to that of the carrier 4. The guide member 5 has a perfect circular shape and is rotatably supported by a plurality, for example, three or more, support rollers 15 from the outside thereof. Guide member 5
A ring gear 16 is provided on the outer periphery of the gear so as not to interfere with the support roller 15, and a drive gear 17 is meshed with the ring gear 16.

In the case of this embodiment, the carrier 4 is
The workpiece W is conveyed in the X arrow direction with the rotation of the carrier 4 while the guide member 5 is driven in the counter X arrow direction by the drive gear 17 while being rotated in the arrow direction. In this way, since the carrier 4 and the guide member 5 rotate in opposite directions, the workpiece W in the pocket 3 can be surely rotated at a high speed. FIG. 6 shows a fourth embodiment of the present invention.
In the grinding region on the grinding position B side, the carrier is set so that the gap near the grinding position E in the final portion where the workpiece W passes between both grinding wheels 1 and 2 is minimized.
The guide member 4 and the guide member 5 are disposed eccentrically in an oblique direction. The supply position A is set on the notch 14 side of the guide member 5. In this embodiment, among the grinding regions on the grinding position B side, particularly, the gap near the grinding position E in the final portion is the smallest, so that the posture of the workpiece W near the grinding position E is the most. As a result, the grinding accuracy of the workpiece W is further improved. Further, since the supply position A is on the side of the notch portion 14 of the guide member 5, the workpiece W
Can be easily supplied to the pocket 3 without interfering with the guide member 5.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to these embodiments. For example, in the embodiment, the tooth portion 10 of the carrier 4 is processed by a standard module of a spur gear, and a pair of adjacent tooth portions is machined.
The pockets between 10 are 3 pockets, but the teeth 10 are trapezoidal, square,
It may be formed in another shape, or a notch such as a square or a V may be cut out and formed on the outer periphery of a perfect circular disk constituting the carrier 4, and the notch may be used as the pocket 3.
The carrier 4 may be made of a material other than a disk. The guide member 5 does not necessarily have to be a perfect circle,
The shape is such that the gap on the A side is large and the gap on the grinding position B side is small, and the workpiece W rotates at least at the grinding position B side where the workpiece W passes between the grinding wheels 1 and 2. Anything that can be guided to is enough. Further, the width of the carrier 4 and the guide member 5 may be the same, or the width of the carrier 4 may be larger than the width of the guide member 5. The present invention also provides
The present invention can also be implemented in a vertical double-sided surface grinding machine.

[0015]

According to the present invention, in a double-sided surface grinder for grinding both end surfaces of a workpiece W held by a carrier 4 with a pair of grindstones 1 and 2, a plurality of circumferentially arranged outer circumferential surfaces of the carrier 4 are provided. With a pocket 3 on the outside of the carrier 4,
The workpiece W is held between the pocket 4 of the carrier 4 and at least the workpiece W with the rotation of the carrier 4.
A guide member 5 for guiding the workpiece W to rotate on the grinding position B side where the workpiece W passes between the grindstones 1 and 2 is provided.
The gap on the grinding position B side between the workpiece and the guide member 5 is reduced and the gap on the side opposite to the grinding position B is increased, so that the workpiece W is stored in the pocket 3 of the carrier 4 at the supply position A.
, The workpiece W can be stably held by the carrier 4 and the guide member 5 at the grinding position B, and the posture of the workpiece W at the grinding position B is improved. Moreover, both end faces can be ground at right angles to the outer diameter of the workpiece W without being affected by the inclination accuracy of the grinding wheels 1 and 2.
Both end surfaces of the workpiece W can be ground with high precision.

Each pocket 3 is provided on a concentric circle on the outer periphery of a disk constituting the carrier 4, and the guide surface 13 on the inner peripheral side of the guide member 5 is formed in a perfect circle, and the guide member 5 is attached to the carrier 4. Carrier 4
And the guide member 5 is easy to manufacture, and the carrier
The relative position of the guide member 5 with respect to 4 can also be easily determined. Further, a spur gear-shaped tooth portion 10 is formed on the outer periphery of the disk in the circumferential direction, and a pocket 3 is formed between a pair of tooth portions 10 adjacent in the circumferential direction.
Therefore, the carrier 4 can be processed with a spur gear standard module using a gear cutting machine such as a hobbing machine, so that the carrier 4 can be easily processed and can be manufactured easily at low cost.

[Brief description of the drawings]

FIG. 1 is a side view of a horizontal double-sided surface grinder showing a first embodiment of the present invention.

FIG. 2 is a plan view of the horizontal double-sided surface grinder showing the first embodiment of the present invention.

FIG. 3 is an enlarged view of a main part of the carrier according to the first embodiment of the present invention.

FIG. 4 is a side view of a horizontal double-sided surface grinding machine showing a second embodiment of the present invention.

FIG. 5 is a side view of a horizontal double-sided surface grinding machine showing a third embodiment of the present invention.

FIG. 6 is a side view of a horizontal double-sided surface grinding machine showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1,2 Whetstone 3 Pocket 4 Carrier 5 Guide member 10 Tooth 13 Guide surface W Workpiece A Supply position B Grinding position

Claims (3)

[Claims] 1. A double-headed surface grinder in which both end faces of a workpiece held by a carrier are ground by a pair of grindstones, a plurality of pockets are provided on an outer periphery of the carrier in a circumferential direction, and a plurality of pockets are provided. Outside, the workpiece is held between the pockets of the carrier and the workpiece rotates at least on the grinding position side where the workpiece passes between the grinding wheels with the rotation of the carrier. Providing a guide member for guiding, so as to reduce the gap on the grinding position side between the carrier and the guide member,
A double-sided surface grinder wherein the gap on the side opposite to the grinding position is increased. 2. The pocket is provided on a concentric circle on the outer periphery of a disk constituting the carrier, and the guide surface on the inner peripheral side of the guide member is formed in a perfect circle, and the guide member is moved relative to the carrier. 2. The double-sided surface grinding machine according to claim 1, wherein the double-sided surface grinding machine is arranged eccentrically. 3. The disk according to claim 1, wherein a spur gear-shaped tooth portion is formed on the outer periphery of the disk in the circumferential direction, and the pocket is formed between a pair of adjacent tooth portions in the circumferential direction. Double-sided surface grinder described in 1.