JPH0226608Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a double-head surface grinder that carries a workpiece between rotating grindstones and simultaneously grinds both sides of the workpiece using both grindstones.

BACKGROUND ART Generally, as an example of the double-headed surface grinder described above, a structure shown in FIG. 4 is known. That is, this double-head surface grinder has a pair of quills 2 and 3 concentrically movable in the vertical direction via a worm or the like by a suitable drive mechanism (not shown) on a frame 1.
A rotating main shaft 8 is supported vertically and opposed to each other, and is rotatably driven by motors 4 and 5 via belt transmission mechanisms 6 and 7 within both quills 2 and 3, respectively.
9 is rotatably supported, and grindstone heads 10 and 11 are mounted at corresponding shaft ends (not shown) of both rotating main shafts 8 and 9, respectively.
, and the grinding wheels 12 and 13 are mounted on both the grinding wheels 10 and 11 so that their grinding surfaces face each other, and the grinding wheels 12 and 13 are installed between the two grinding wheels 12 and 13 in a plane perpendicular to the rotational axes 8 and 9 of the grinding wheels 12 and 13. A carrier plate 14 is provided to rotate between the upper and lower rotating grindstones 12 and 13, and a workpiece is carried between the rotating upper and lower grindstones 12 and 13 by means of the carrier plate 14, and both surfaces of the workpiece are placed between the two grindstones 12 and 13.
13, the grinding process is performed simultaneously.

By the way, in the above-mentioned double-head surface grinder, the grinding wheels 12 and 13 are used for a long period of time, and the grinding wheels 12 and 13 are
If the grinding conditions are inappropriate, the grinding surfaces of the grinding wheels 12 and 13 become clogged or clogged, resulting in poor sharpness and increased heat generation, resulting in grinding cracks and grinding burns on the finished surfaces.

Therefore, when the grinding surfaces of the grinding wheels 12 and 13 become clogged or clogged, the worn out abrasive grains on the upper layer of the grinding surface and the chips clogged in the gaps or pores between the abrasive grains are removed, and the grinding surface is removed. It is necessary to perform a dressing operation to expose new abrasive grains on the surface.

Conventional dressing operations are performed using dresser equipment. As shown in Figure 4, this dresser device has one diamond chip on the top and bottom of the tip.
A rod-shaped diamond dresser 16 to which diamond chips 5 and 15 are fixed is rotatably provided on the frame 1.
5 and 15 are inserted between the grinding surfaces of the grindstones 12 and 13,
Diamond chip 1 is removed by rotating the diamond dresser 16 while rotating the grindstones 12 and 13.
5 and 15 in the radial direction of the grinding wheels 12 and 13, the worn out abrasive grains or clogged chips on the upper layer of the grinding surfaces of the grinding wheels 12 and 13 are scraped off with the diamond chips 15 and 15, and new abrasive grains are removed. I'm trying to expose that.

Problems to be Solved by the Invention By the way, in dressing work using the diamond dresser 16 as described above, in order to insert the diamond dresser 16 between the grinding surfaces of the upper and lower grinding wheels 12 and 13, Upper and lower whetstones 12,1
3 had to be raised and lowered in the vertical direction to move the dressing over a large distance, which required a lot of effort and time, and the efficiency of the dressing work was poor.

Means for Solving the Problems This idea was proposed in view of the problems mentioned above. Diamond abrasive grains or the like are electrodeposited in a predetermined width on the outer periphery of the upper and lower surfaces of the carrier plate, and a dresser is applied to the corresponding parts. It is characterized by forming a grindstone and equipping the carrier plate with a dressing function.

Function When the carrier plate is sandwiched between the upper and lower grinding wheels without a workpiece attached to the carrier plate, and the carrier plate is rotated at the same time as both grinding wheels are rotated, the worn out abrasive grains on the surface layer of the grinding surfaces of both grinding wheels are removed. Alternatively, the clogged chips are ground off by dresser grindstones formed on the outer periphery of the upper and lower surfaces of the carrier plate, and new abrasive grains are exposed on the grinding surfaces of both grindstones.

Embodiment Fig. 1 shows an example in which this invention is applied to the double-head surface grinder shown in Fig. 4. Items with the same reference numerals as in Fig. 4 indicate the same or similar content as in Fig. 4, and differences are noted. The diamond dresser 16, which has a dressing function for the grinding surfaces of the upper and lower grindstones 12 and 13, is removed, and the dressing function is added to the carrier plate 14. That is, as shown in FIGS. 2 and 3, the carrier plate 14 is coated with diamond abrasive grains or the like in a predetermined dimension on the outer periphery of the upper and lower surfaces in a layer that is thinner than the dimension in which the workpiece protrudes from the carrier plate 14. Dresser grindstones 17 and 18 are formed on the corresponding portions by electrodeposition.

The above is the configuration of this invention, and the grinding operation of the double-head surface grinder of this invention is the same as the conventional one.
The explanation will be omitted.

Next, the grinding wheel 1 made by the double-headed surface grinder of this invention
The dressing operations 2 and 13 will be explained.

First, loading onto the carrier plate 14 is interrupted and the carrier plate 14 is emptied.
Next, the upper and lower grindstones 12 and 13 are lowered and raised by the quills 2 and 3, respectively, to sandwich the carrier plate 14 between the two grindstones 12 and 13. Thereafter, both the grindstones 12 and 13 are rotated, the carrier plate 14 is also rotated, and the upper quills 2 and 3 are lowered and raised to give both the grindstones 12 and 13 a predetermined depth of cut. Then, worn abrasive grains or clogged chips on the surface layer of the grinding surfaces of the grinding wheels 12 and 13 are easily scraped off by the dresser grinding wheels 17 and 18 formed on the outer periphery of the upper and lower surfaces of the carrier plate 14. New abrasive grains are exposed on the grinding surfaces of the grindstones 12 and 13, and the dressing operation is completed.

Although the above description has been made regarding a vertical double-head surface grinder, this invention is not limited thereto, and can easily be applied to a horizontal double-head surface grinder.

Effects of the device As explained above, this device electrodeposits diamond abrasive grains, etc. on the outer periphery of the upper and lower surfaces of the carrier plate in a layer thinner than the dimension in which the workpiece protrudes from the carrier plate, and adheres it to the corresponding area. Since the dressing function is added to the carrier plate and the dresser grinding wheel is formed in the grinding wheel, there is no need to install both separately, the mechanism is simple, and the cost of the device is low.

According to the proposed device, since the dressing grindstone is formed thinly, there is no problem in grinding the workpiece, and during dressing work, the upper and lower grindstones are slightly moved so as to come into contact with the dressing wheel surface without a workpiece attached. This can improve the workability of the dressing work, shorten the work time, and improve the operating rate of the grinder. Furthermore, since this invention performs dressing near the trajectory of the workpiece, the dressing accuracy is good and the processing accuracy of the workpiece can be improved.

[Brief explanation of the drawing]

Figure 1 is a drawing showing an embodiment of this invention;
The figure is a plan view of a carrier plate used in this invention, FIG. 3 is an enlarged sectional view taken along the line A--A in FIG. 2, and FIG. 4 is a drawing showing a conventional example. 1...Frame, 2,3...Quill, 8,9...
... Rotating main shaft, 12, 13... Grinding wheel, 14... Carrier plate, 17, 18... Dresser grinding wheel.

Claims (1)

[Scope of claim for utility model registration] Grinding wheels are arranged with their grinding surfaces facing each other,
In a double-head surface grinder that carries a workpiece between the two grinding wheels using a carrier plate and simultaneously grinds both surfaces of the workpiece with the two grinding wheels, a predetermined width dimension is placed on the outer periphery of the upper and lower surfaces of the carrier plate. A double-head surface grinder characterized in that diamond abrasive grains or the like are electrodeposited in a layer that is thinner than the dimension in which the workpiece protrudes from the carrier plate to form a dresser grindstone in that part.