JPS63207549A - Vertical duplex head surface grinding machine - Google Patents

Abstract

PURPOSE:To prevent the heat of grinding fluid from being transmitted to a machine body as well as to aim at improvement in accuracy of finishing, by making the grinding fluid to be fed to a wheel part pass through only the inside of a wheel guard, and discharging it to the outside from a grinding fluid discharge port at a lower end of the wheel guard. CONSTITUTION:The work held by a rotating carrier disc 15 is ground between two grinding wheels 7 and 8. On the other hand, grinding fluid is fed to a grinding part from a grinding supply passage 29 of a turning shaft 5, and it is discharged to the outside from a discharge port via a discharge pipe 18 after passing through only the inside of a wheel guard 12. Therefore, even if the wheel guard 12 itself is heated by heat of the grinding fluid, heating value of the grinding fluid is not almost transmitted to a machine body 1 because the wheel guard 12 is set up as separated from the machine body 1, supported by legs 21 and 22 via a heat insulating material 23, and a heat insulating plate 26 is set up in a gap with the machine body 1 whereby a convective air layer is cut off. Thus, thermal deformation in the machine body is not caused and accuracy of finishing in the work is favorably maintained, while cleaning of the residual grinding fluid after operation comes easy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vertical double-head surface grinder that continuously supplies grinding fluid to a grinding wheel portion.

(Prior art and its problems) In general, in this type of surface grinder, the temperature of the grinding fluid rises as the workpiece is machined repeatedly, which causes thermal deformation of the machine body, which causes the axis of the rotating shaft to tilt. death,
Alternatively, there is a problem in that machining accuracy decreases due to deviation.

For example, in the conventional structure in which the grinding fluid is discharged from the grinding fluid discharge port 42 through the inside of the machine body 41 as shown in FIG. However, as a result, the carrier shaft and the upper rotating shaft 5 are tilted in opposite directions as shown by Ll and L2, respectively, and the machining accuracy is reduced.

In order to reduce the thermal deformation as described above, for example, as shown in FIG.
A structure in which grinding fluid flows through the grindstone guard 12 has been developed. However, since the grinding wheel guard 12 is directly fixed to the machine body (column) 41, it is not possible to effectively prevent the heat of the grinding fluid from being transmitted to the machine body 41.
The upper part of is thermally deformed and tilted backward as shown by arrow L3,
Along with this, the upper rotating shaft 5 also tilts rearward as indicated by L4.

(Objective of the invention) The present invention aims to prevent thermal deformation of the machine body and improve machining accuracy by isolating the grinding fluid whose temperature has increased as much as possible from the machine body and cutting off heat conduction between the machine body and the machine body. It is an object.

(Means for Achieving the Object) In order to achieve the above object, the present invention arranges a box-shaped grinding wheel guard that accommodates both magnets and a part of the carrier disk at a distance from the machine main body. The above-mentioned grinding wheel guard is fixed to the provided support leg via a heat insulating material, and a heat insulating plate is placed between the grinding wheel guard and the machine body, and a grinding fluid outlet is provided at the lower end of the grinding wheel guard to supply it to the grinding wheel part. The grinding fluid is allowed to pass only through the grinding wheel guard and is discharged to the outside from the grinding fluid outlet.

(Function) The grinding fluid supplied to the grinding portion of the grindstone passes only through the grindstone guard and is discharged outside from the grinding fluid outlet without passing through the machine body. Moreover, the grinding wheel guard is placed at a distance from the machine body and is fixed to the legs via a heat insulating material, and a heat insulating plate is placed between it and the machine body, so the heat of the grinding fluid inside the grinding wheel guard is The amount transmitted to the machine body is extremely small, effectively preventing thermal deformation of the machine body.

(Example) In FIG. 1 showing a left side view of a chamber shaft type double-head surface grinder to which the present invention is applied, a machine body 1 is integrally equipped with a pair of left and right beds 2 and a column 3 thereon. A pair of vertical rotating shafts 5.6 (upper and lower) are rotatably supported at the front part of 3. Both rotating shafts 5.6 are aligned on the same axis, and
Each rotary shaft drive device 11. via a belt transmission mechanism.
11. An annular grinding wheel 7.8 is fixed to the opposing ends of both rotating shafts 5.6, respectively, and both magnets 7.8 are opposed to each other with a grinding gap in between. Upper rotating shaft 5
A grinding fluid supply passage 29 is formed inside, and the grinding fluid is supplied to the portion between the grinding wheels.

In FIG. 2, which shows a front view, a horizontal carrier disk 15 is arranged to the right of the grinding wheel 7.8.
is fixed to a vertical rotating shaft 17 and rotated by a disc drive device 16 so that it passes between the grindstones while rotating.

Although not shown, the carrier disk 15 has a plurality of workpiece holding pockets spaced apart in the circumferential direction, and holds the workpieces in the pockets to supply the workpieces between the grindstones.

The grinding wheel guard 12, which is the main part of the present invention, is formed in a box shape and accommodates both magnets 7.8, parts of both rotating shafts 5.6, and part of the carrier disk 15.

In other words, it houses the grinding part.

In FIG. 3 showing an enlarged perspective view of the whetstone guard 12, the whetstone guard 12 is arranged upwardly at a distance from the top surface of the bed 2, and is also arranged at a distance from the front end surface of the column 3, It is fixed onto the front and rear support legs 21 and 22 via heat insulating materials 23, respectively.

That is, a portal-shaped front support leg 21 extending upward is fixed to the front end of the bed 2, a rear leg 22 extending forward is fixed to the front wall of the column 3, and a rear leg 22 extending forward is fixed to the lower surface of the whetstone guard 12.
Plate-shaped heat insulators 23 made of ceramic or glass wool are adhered to the corners, and each heat insulator 23 projects from the left and right end surfaces of the grindstone guard 12, respectively. The grinding wheel guard 12 is placed on the legs 21.22 via the insulation material 23, and the bolt 2
4 fixes the insulation 23 to the legs 21.22.

The grinding wheel guard 12 has circular rotating shaft insertion holes 30 and 31 formed in the upper and lower walls, a rectangular carrier disk insertion hole 32 in the right wall, and a grinding fluid drainage hole in the lower wall. An outlet 19 is formed. A discharge pipe 18 is connected to one of the grinding fluid discharge ports, and the discharge pipe 18 is connected to a grinding fluid circulation device via, for example, a pipe.

In addition, the grindstone guard 12 has an L extending from its front wall to the left wall.
A letter-shaped inspection door 33 is provided, and the door 33 is supported by the grindstone guard 12 via a hinge 34 so as to be freely openable and closable, and is used when replacing the grindstone or inspecting the grindstone.

Although not shown, rubber seals or the like are provided at the edges of the holes 30.31.
The gaps between the rotary shaft 5.6 and the carrier disk 15 shown in FIG. 1 are sealed to prevent grinding fluid from leaking through these holes.

In FIG. 4 showing an enlarged partial view of the IV-IV cross section of FIG. 2, two heat insulating plates 26 having low thermal conductivity are arranged between the rear wall of the grinding wheel guard 12 and the column 3,
They are spaced apart from each other with spacers 27 in between, and the plate attachment of the grindstone guard 1 is fixed to the piece 35 with bolts 28. As the heat insulating plate 26, an austenitic stainless steel plate, a foamed urethane plate, or the like is used. In particular, the surface of the stainless steel plate is sufficiently polished to have the effect of reflecting radiant heat.

Next, the operation will be explained. A workpiece held on a rotating carrier disk 15 in FIG. 2 is fed between both grindstones 7.8, and both sides of the workpiece are ground while passing between the grindstones 7.8.

The grinding fluid supplied to the grinding section from the grinding fluid supply passage 29 of the upper rotating shaft 5 in FIG.

Even if the grinding wheel guard 12 itself is heated by the amount of heat of the grinding fluid, the grinding wheel guard 12 is arranged at a distance from the machine body 1 and is supported by the legs 21 and 22 via the heat insulating material 23, By disposing the heat insulating plate 26 between the machine body 1 and the machine body 1, the convection air layer is blocked, and the amount of heat is hardly transmitted to the machine body 1, so that thermal deformation of the machine body 1 can be prevented.

(Effects of the Invention) As explained above, the present invention has the box-shaped grindstone guard 12 that accommodates both grindstones 7.8 and a part of the carrier disc 15 arranged at a distance from the machine body 1. The grindstone guard 12 is fixed to support legs 21 and 22 provided on the machine body 1 through a heat insulating material 23, and
A heat insulating plate 26 is disposed between them, and a grinding fluid discharge port 19 is provided at the lower end of the grinding wheel guard 12, so that the grinding fluid supplied to the grinding wheel portion passes only through the inside of the grinding wheel guard 12 and is discharged from the grinding fluid discharge port 19 to the outside. Therefore, it is possible to effectively prevent the heat of the grinding fluid from being transmitted from the grinding wheel guard 12 to the machine body 1, thereby preventing thermal deformation of the machine body and preventing the heat deformation caused by the above-mentioned thermal deformation. Misalignment and inclination of the rotating shafts 7.8 can be effectively prevented. There is no need to worry about the workpiece machining accuracy being degraded due to excessive pressure.

The grinding fluid supplied to the grinding section passes only through the grinding wheel guard 12 and is discharged to the outside, and does not pass through the machine body 1, so the inside of the machine body 1 will not be contaminated by the used grinding fluid, and the grinding fluid will not be contaminated after work. It is easy to clean residual grinding fluid, etc.

[Brief explanation of the drawing]

FIG. 1 is a left side view of a double-head surface grinder to which the present invention is applied;
Figure 2 is a front view, Figure 3 is a large perspective view of the grinding wheel guard, Figure 4 is an enlarged partial view of the IV-IV cross section of Figure 2, and Figures 5 and 6.
The figure is a longitudinal sectional view of a conventional example. 1... Machine body, 5.6... Rotating shaft, 7.8...
Grinding wheel, 12... Grinding wheel guard, 15... Carrier disk, 19... Grinding fluid outlet, 21.22... Support leg,
23...Insulating material, 26...Insulating plate

Claims (1)

[Claims] The machine body supports a pair of vertical rotating shafts with the same axis, upper and lower.
Grinding wheels are fixed to the opposing ends of both rotating shafts, and a carrier disk that passes between the two grinding wheels while rotating and supplies the workpiece between the grinding wheels is supported on the machine body, and the grinding fluid is supplied to the grinding wheels. In a vertical double-head surface grinder, a box-shaped grindstone guard that accommodates both grindstones and a part of the carrier disk is arranged at a distance from the machine body, and the In addition to fixing the whetstone guard, a heat insulating plate is placed between the whetstone guard and the machine body, and a grinding fluid discharge port is provided at the lower end of the whetstone guard, allowing the grinding fluid supplied to the whetstone to pass only through the inside of the whetstone guard. A vertical double-head surface grinder characterized in that grinding fluid is discharged to the outside from a discharge port.