JPH0314291Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a double-head surface grinder used to simultaneously grind both sides of a workpiece.

[Conventional technology]

The above-mentioned double-head surface grinder is configured such that two grinding wheels are arranged with their grinding surfaces facing each other, a workpiece is indexed between the grinding surfaces of both grinding wheels, and both surfaces of the workpiece are simultaneously ground by both grinding wheels. has been done.

Conventionally, in the above-mentioned double-head surface grinder, there has been a method that gives rotation and oscillation motion to the grinding wheel in order to improve the grinding ability of the workpiece, but this has the disadvantage that the support structure of the grinding wheel head becomes complicated, so it has not been practical As seen in Publication No. 51-11100, there are those that give oscillation motion and revolutional motion to the workpiece, and as seen in Japanese Patent Application Laid-Open No. 53-80895, there are those that give the workpiece rotational motion and revolutional motion. is proposed.

[The problem that the idea attempts to solve]

However, in the former method of imparting oscillation motion and revolution motion to the workpiece, it is necessary to include a mechanism that imparts revolution motion to the workpiece and to cause the work holder to perform oscillation motion between both grinding wheels. The thickness is too large, making it impossible to apply to thin workpieces, and the mechanism for imparting orbital motion to the workpiece is extremely complicated. Moreover, the grinding process of the workpiece is done in batches, which is inefficient. In addition, in the latter method of imparting rotational motion and revolving motion to the workpiece, a planetary Since a workpiece holder consisting of gears is provided, the structure of the grinding wheel head becomes very complicated, and the grinding process of the workpiece is performed in batches, which is inefficient.

This idea was made in view of the above-mentioned drawbacks of the conventional method, and its purpose is to improve grinding efficiency and grinding accuracy by imparting oscillation motion and automatic motion to the workpiece, and at the same time improve the drive system. It is an object of the present invention to provide a double-head surface grinder whose structure can be made simple and inexpensive.

[Means to solve the problem]

In order to achieve the above object, this invention is a double-headed surface grinder in which two rotating grindstones are coaxially arranged facing each other to grind both sides of a workpiece at the same time. , a carrier plate that reciprocates in a direction perpendicular to the grinding wheel axis by an appropriate reciprocating mechanism and is driven to rotate intermittently by an appropriate intermittent rotation mechanism; , and a plurality of workpiece holding jigs that hold the workpieces in a rotation-stopping manner, a drive shaft that is disposed outside the outer diameter of the grindstone and is connected to the workpiece holding jig via a suitable transmission mechanism, and a machine stand. A double-headed surface grinder is provided, which includes a work drive motor supported by a stationary part and giving rotation to the drive shaft.

[Effect]

According to this invention, oscillation motion and rotational motion can be imparted to the workpiece by the reciprocating motion of the carrier plate and the rotation of the workpiece holding jig, and the workpiece can be ground while being subjected to oscillation motion and rotational motion.

〔Example〕

Examples of this invention will be described below based on the drawings.

In FIGS. 1 and 2, reference numerals 1 and 2 are a pair of grinding wheels disposed vertically and oppositely on a coaxial line, and although not shown in the drawings, each is rotatably supported by a stationary part of the machine, and It is connected to a grindstone motor via an appropriate transmission mechanism, and is rotationally driven by this grindstone motor. Both grinding wheels 1 and 2 are supported by the device frame along with their rotating shafts so as to be movable in the vertical direction, and by moving the upper grinding wheel 1 in the vertical direction, the distance between the two grinding stones 1 and 2 can be adjusted to the thickness of the workpiece. Adjust accordingly and make a cut in the workpiece.

A carrier plate 3 indexes the workpiece W between the two grindstones 1 and 2, and rotatably holds the workpiece holding jig 4 for holding the workpiece W at a plurality of positions equidistantly located on the circumference, for example, at two positions. The workpiece holding jig 4 has a pocket 5 for accommodating the workpiece W, and a gear 7 is cut into a shoulder 6 on the outer circumference, and the outer shoulder 6 is connected to the circumferential surface of the jig holding hole 8 of the carrier plate 3. It fits into an inner circumferential groove 9 formed in and is rotatably held in a jig holding hole 8 of the carrier plate 3. Further, a rotation prevention member 10 is protruded from a part of the pocket 5 of the workpiece holding jig 4, and the rotation prevention member 10 is hooked into the recessed portion a of the workpiece W, so that the workpiece holding jig 4 and the workpiece W are connected to each other. The workpiece W is stopped from rotating so that it can rotate as a unit.

Reference numeral 11 denotes a rotating shaft of the carrier plate 3 which is rotatably supported by a bearing block 12 via bearings 13, 13 and 14. The carrier plate 3 is integrally attached and fixed to the upper end, and an index is attached to the lower end. A worm wheel 1 that is constantly engaged with a worm 15 connected to a motor (not shown)
Fix 6 together. Therefore, by driving the index motor, the rotary shaft 11 is rotated via the worm 15 and the worm wheel 16, and the carrier plate 3 is accordingly rotated.

Further, the bearing block 12 that pivotally supports the rotating shaft 11 is slidable on a pair of guide rods 18, 18 fixedly arranged in parallel to a stationary part of the machine via brackets 17, 17, etc., which are not shown in the drawings. Supported by In addition, the guide rod 1 of the bearing block 12
A pair of receiving members 1 are provided on the side surfaces parallel to 8 and 18.
9 and 19 are attached and fixed, and this receiving member 1
An eccentric cam 20 is held between 9 and 19. The eccentric cam 20 is eccentrically attached and fixed to the shaft 21,
An oscillation motor (not shown) fixed to the stationary part of the machine is connected to the shaft 21. Therefore, by driving the oscillation motor, the shaft 21
The eccentric cam 20 is rotated through the bearing block 12 through the pair of receiving members 19, 19.
is reciprocated in the horizontal direction along a pair of guide rods 18, 18, and along with this, the carrier plate 3 is reciprocated via the rotating shaft 11 pivotally supported by the bearing block 12, and the carrier plate 3 is held by the carrier plate 3. Oscillation motion is applied to the workpiece W via the workpiece holding jig 4.

Reference numeral 22 denotes a drive shaft rotatably supported on the carrier plate 3, and a drive gear 23 is integrally attached and fixed to the lower end of the drive shaft, and the drive gear 23 is rotatably inserted into the holding jig hole 8 of the carrier plate 3. It meshes with the gear 7 of the work holding jig 4 to be held. Also,
A work drive motor 25 fixed to the stationary part of the machine is connected to the upper end of the drive shaft 22 via a telescoping universal joint 24. Therefore,
By driving the work drive motor 25, the drive shaft 22 is rotated through the universal joint 24, thereby rotating the work holding jig 4 through the drive gear 23 and the gear 7 of the work holding jig 4, In conjunction with this, the workpiece W accommodated and held in the pocket 5 of the workpiece holding jig 4 is given a rotational motion.

The double-headed surface grinder of this invention has the above-mentioned structure, and the function and operation of the above-mentioned structure will now be explained.

First, the workpiece W is set on the workpiece holding jig at the loading position, that is, the workpiece holding jig 4 located on the left side of the carrier plate 3 in FIG. To set the work W into the work holding jig 4, place the work W into the pocket 5 of the work holding jig 4.
At the same time, the recess a of the workpiece W is hooked to the rotation prevention member 10 of the workpiece holding jig 4, whereby the workpiece W is prevented from rotating relative to the workpiece holding jig 4, and the workpiece W and the work holding jig 4 can rotate together. After setting the work W on the work holding jig 4 in this way, when the work drive motor 25 is driven to rotate the drive shaft 22 via the universal joint 24, the drive gear 23 and the gear of the work holding jig 4 are rotated. The workpiece holding jig 4 rotates via the workpiece holding jig 7, and the workpiece W set on the workpiece holding jig 4 rotates. Therefore,
The workpiece W rotates. At the same time, the oscillation motor is driven to connect the eccentric cam 20 via the shaft 21.
When the bearing block 12 is rotated, the bearing block 12 is connected to the pair of guide rods 18, 1 through the pair of receiving members 19, 19.
8, the carrier plate 3 reciprocates via the rotating shaft 11 supported by the bearing block 12, and along with this, the workpiece holding jig held by the carrier plate 3 The workpiece W is reciprocated via the tool 4. Therefore, the work W
oscillates in the horizontal direction, that is, in the direction perpendicular to the grinding wheel axis.

Thereafter, when the index motor is driven to rotate the worm 15 by a predetermined amount, the rotating shaft 11 is rotated at a predetermined angle via the worm wheel 16.
Since the rotation is 180 degrees, the carrier plate 3 that is integrally attached and fixed to the rotating shaft 11 rotates half a rotation, and as a result, the workpiece W is moved between the two grindstones 1 and 1 through the workpiece holding jig 4 held by the carrier plate 3. 2, and both surfaces of the workpiece W are simultaneously ground by both grindstones 1 and 2.

As described above, according to the double-head surface grinder of this invention, when the workpiece W is given rotational motion and oscillation motion in the direction perpendicular to the grinding wheel axis,
The workpiece W is indexed between both grinding wheels 1 and 2, and both sides of the workpiece are ground by both grinding wheels 1 and 2.
The workpiece W comes into contact with both grindstones 1 and 2 unbiasedly, and the flatness and parallelism can be highly accurate and highly efficient grinding can be performed.

In the above embodiment, since the work W is circular, the rotation preventing member 10 is required between the work W and the work holding jig 4 so that the work W and the work holding jig 4 can rotate together. However, for a non-circular workpiece, if the pocket 5 of the workpiece holding jig 4 is shaped to match the shape, the rotation preventing member 10 described above becomes unnecessary.

[Effect of idea]

As explained above, since this invention performs grinding by imparting rotational motion and oscillation motion to the workpiece, the amount of grinding increases and highly efficient grinding is possible. In particular, in a double-head surface grinder, the grinding wheel inevitably wears unevenly due to the difference in circumferential speed between the inner and outer diameters, but by imparting rotational motion and oscillation motion to the workpiece, it is possible to bring the workpiece into contact with the grinding wheel evenly. This allows stable and highly accurate flatness and parallelism to be obtained on the workpiece. Furthermore, since the mechanism for imparting rotation to the workpiece is placed outside the grindstone, rotational motion can be easily transmitted while performing oscillation motion using a simple universal joint, and the structure of the drive system can be simplified.

[Brief explanation of drawings]

Figure 1 is a schematic front view showing an embodiment of a double-head surface grinder according to this invention, and Figure 2 is an arrow A in Figure 1.
- It is a top view taken from the A line. 1, 2...Whetstone, 3...Carrier plate, 4
... Work holding jig, 7 ... Gear, 10 ... Rotating member, 11 ... Rotating shaft, 12 ... Bearing block, 15 ... Worm, 16 ... Worm wheel, 18, 18 ... Guide rod, 19, 19...Receiving member, 20...Eccentric cam, 22...Drive shaft, 2
3... Drive gear, 24... Universal joint, 25... Work drive motor.

Claims (1)

[Scope of Claim for Utility Model Registration] In a double-head surface grinder that simultaneously grinds both sides of a workpiece by arranging two rotating grindstones facing each other on the same axis, a part of the periphery overlaps between the two grindstones, and A carrier plate that reciprocates in a direction perpendicular to the grinding wheel axis by a reciprocating mechanism and is driven to rotate intermittently by an appropriate intermittent rotation mechanism; a plurality of workpiece holding jigs that hold the grinding wheel in a fixed position; a drive shaft that is placed outside the outer diameter of the grindstone and is connected to the workpiece holding jig via an appropriate transmission mechanism; and a drive shaft that is supported by the stationary part of the machine. and a work drive motor that provides rotation to the drive shaft via an appropriate transmission mechanism.