JPH0413562A - Multibelt grinding machine - Google Patents

Abstract

PURPOSE:To eliminate the need for a large scale transfer positioning device, by erecting plural belt grinding beds of different grinding conditions radially on the rotating column erected on an index table and positioning an optional belt grinding head with its rotation to the work station set at one place. CONSTITUTION:Plural grinding heads 2 equipped with the belts 6 which are set for rough finishing, medium finishing and final finishing by grinding stages under the respectively different grinding conditions and a motor for driving the belt with its rotation, are arranged on the outer periphery of an index table to compose one belt grinding machine. Consequently, plural belt grinding heads 3 of different grinding conditions individually are positioned with their rotations in order for the work 5 to be worked and the grinding of different grinding conditions is executed on the work 5 at the same positioned place.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-belt grinding machine that is equipped with a plurality of belt grinding heads with different processing conditions on the outer periphery of an index table and is mainly suitable for bead removal. It is.

[Conventional technology]

Generally, in the method of performing belt grinding on a workpiece, multiple belt grinders are arranged for each grinding process, each with different grinding conditions for rough finishing, semi-finishing, and final finishing. A method is adopted in which a workpiece is conveyed and positioned between machines, and each grinder performs belt grinding under different grinding conditions such as rough finishing, semi-finishing, and final finishing.

[Problem to be solved by the invention]

However, multiple belt grinders with different grinding conditions are placed on the workpiece conveyance line, and the conveyance position of the workpiece is determined for each belt grinder with different grinding conditions for rough finishing, semi-finishing, and final finishing. If this is done, the equipment for this purpose will be large-scale, and the processing cost and equipment cost will also be high, making it unsuitable for high-mix, low-volume production equipment.

In addition, if you try to maintain the grinding conditions of each grinder at a constant level, you will not only have to frequently replace the grinding belt in each grinder, but you will also have to stop the line every time you replace the grinding belt, resulting in production It was also inconvenient from a sexual perspective.

The present invention has been made with the object of providing a belt grinding machine suitable mainly for bead removal processing, which can solve the problems of the prior art as described above.

[Means to solve the problem]

In order to solve the above problems, the present invention has a slide unit 2 which is movable and fixed in the vertical direction on the outer periphery of an index table 1 which performs rotational positioning when the maximum rotation angle is 360 degrees or less. A plurality of belt grinding heads 3 each having a grinding belt selected according to preset grinding conditions and a rotation drive system for the belt are attached to each of these slide units. The present invention is characterized in that one of the belt grinding heads 3 described above is rotationally positioned using an index table to perform grinding on a workpiece to be transported and positioned for grinding.

[For production]

The present invention can be used, for example, in a bead removal belt grinding machine.
A single belt grinder is equipped with belts set to different grinding conditions for rough finishing, intermediate finishing, and final finishing for each grinding process, and multiple grinding heads equipped with motors to drive the rotation of the belts. It was formed by placing it on the outer periphery of the index table.

With this configuration, it is possible to sequentially rotate and position a plurality of belt grinding heads each having different grinding conditions on the workpiece. Therefore, once the workpiece is positioned, grinding operations under different grinding conditions can be carried out at the same position. Therefore, the problems of the conventional technology can be solved.

〔Example〕

Next, an example of implementation of the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view of an example of a multi-belt grinding machine for removing beads to which the present invention is applied, and FIG. 2 is a right side view of the multi-belt grinding machine for removing beads shown in FIG.

An example of the multi-belt grinding machine for removing beads of the present invention shown in the figure is formed from basic components including a belt grinding head 3, a slide unit 2, and an index table 1. explain.

A: Belt grinding head 3 The three belt grinding heads 3 mounted on the grinding machine of the present invention shown in FIG. 1 are connected to the index table 1 shown in FIG.
This is a device that is attached in a one-to-one relationship to three slide units 2 erected on the ground, and removes beads from a workpiece 5.

It is structured as follows.

The grinding head 3 includes a head portion 3H on which a grinding belt 6 is attached, and a motor 4 that rotates the grinding belt 6.
When inserting the grinding belt 6 of the grinding head 3 into the workpiece 5,
The belt 6 is provided with a head relief mechanism (see FIG. 3) to prevent the belt 6 from coming into contact with the workpiece 5.

Fig. 3 is a plan view showing the head portion of the grinding head 3 where the grinding belt 6 is attached and the escape mechanism, Fig. 4 is an enlarged front view, and Fig. 5 is a view taken along the v-■ arrow in Fig. 4. 4, the structure of the grinding head 3 will be explained in detail with reference to these figures. In FIG. , is hung between an idler boot IJIO positioned via a pulley bracket 13 at the tip of an arm-shaped bracket 14 attached to the lower end of the casing 8a of the spindle 8. Here, in order to apply appropriate tension to the grinding belt 6, bracket members 14a, 1 are provided on the lower surface of the arm-shaped bracket 14.
4b supports a slide rod 13a with a tension spring 11 interposed therebetween, and the repulsive force of this spring 11 is applied between the contact wheel 9 and the idler pulley 10 to constantly apply tension to the grinding belt 6. ing.

When replacing the grinding belt 6, the slide rod 13
To press the tension spring 11 mounted on the wheel 9, the lever 12 is rotated 90 degrees (clockwise in Fig. 3), and the tension spring 11 is compressed and the wheel 9 and the spring 11 are pressed together.
Loosen the belt 6 that is wrapped around Jlo and replace the grinding belt 6.

In addition, to prevent the grinding belt 6 from meandering, the idler pulley 1
The bracket 13 to which 0 is attached is adjusted by rotating two bolts 15 provided on the arm bracket 14 on the fixed side so that meandering does not occur.

(See Figure 5) On the other hand, the drive unit that rotates the grinding belt 6 is the third drive unit.
As shown in the figure, it is formed by a rotation transmission system that transmits the rotation of the head motor 4 (see FIG. 1) from the motor pulley 17 via the idler pulley 18 to the spindle pulley 19 attached to the upper end of the spindle 8. This allows the contact wheel 9 attached to the lower end of the spindle 8 to rotate. In addition, 19
a is a tension pulley of the belt 19b.

Next, as shown in FIGS. 3 and 4, the grinding pressure mechanism that applies grinding pressure to the grinding portion of the workpiece 5 is mounted on the lower end of the mounting shaft 20 of the idler pulley 18 with a pivot 22a eccentric from this shaft 2 degrees. A case 22 containing a pressure spring 21 is attached in a direction substantially perpendicular to the axis 2o through the shaft 2o, and the tip of a shaft 23 that is coupled to the pressure spring 21 and is pushed by the spring 21 is attached. The spindle 8 is attached to the plate 24 by a shaft fixing connection 23a.

Here, when mounting the spindle 8 mentioned above, the plate 24 is
The idler boot 8 is supported via bearings 25 and 25 inserted into the upper and lower ends of the mounting shaft 2o, so that it moves in an arc around the shaft 2o.

That is, in FIG. 3, it is angularly rotated clockwise about the axis 2o. Therefore, the spindle 8, which is integrally attached to the plate 24 via the casing 8a, makes a circular arc movement in the clockwise direction in FIG. 3 about the attachment shaft 20 of the idler pulley 18. This spring pressure is applied as the grinding pressure of the grinding belt 6 to the grinding portion of the workpiece 5.

On the other hand, the relief mechanism of the belt grinding head 3 is as shown in FIG.
A stopper block 26 is provided between the mounting shaft 20 of No. 8 and the plate 24, and the pressurizing force of the air cylinder 42 acts on the stopper block 26 as a stroke motion to overcome the pressurizing spring 21. The mounting plate 2 is centered around the mounting shaft 20 of the idler pulley 18 by the stroke of the cylinder 42.
4 in a counterclockwise direction in FIG. 3 while drawing a circular arc locus, the head portion of the grinding belt can be released from the workpiece 5.

B Ni-Ride Unit 2 This unit 2 is used when the part of the workpiece 5 to be beaded is deep below the workpiece 5.

In the embodiment of the present invention, the workpiece 5 is a bathtub,
This slide unit 2 was adopted because it is a grinder for removing the bead formed on the bottom of the slide unit.

Therefore, the slide unit 2, as shown in FIG.
By the action of the index table 1, the belt grinding head 3 positioned at the machining station (the position where the grinding process is performed) is moved downward to the location below the workpiece 5 where the bead is to be removed. Raise it to the position.

It is configured such that interference between the head 3 and the workpiece 5 can be avoided when attaching and detaching the workpiece 5 and indexing the grinding head 3.

The slide unit 2 includes a slider member that is loosely fitted and supported by three sets of rail-shaped linear guides 32a that are mounted on the outer periphery of the rotating column 35 in parallel to the vertical direction at intervals of 90' in this embodiment. 32b, and
A mounting bracket 3a to which the rear surface of the main body of each belt grinding head 3 is attached, a support roller 29 provided at the upper end of a support rod 29a extending above the slider member 32b, and each of the linear guides 32a described above form the structure. It is located on the outer diameter and has an opening-shaped side cross section in order to support each of the support rollers 29 described above.

In addition, a support ring 31 is formed of an annular body with a part of the support ring 31 having an open cutout, an elevation bracket 30 having a side cross-sectional opening shape that is fitted into the open cutout part of the support ring 31, and this bracket 30 is attached to the lower end of the rod. The air cylinder 28 is attached to the frame 27 and is erected thereon.

In the slide unit 2, the notch opening of the support ring 31, the elevation bracket 30 fitted into this opening, and the air cylinder 28 supporting this bracket are arranged on the circumference of the one-rotation column 35. It is located at a location corresponding to the processing station in the grinding machine of the present invention.

Therefore, when the column 35 rotates and the support roller 29 of the belt grinding head 3 reaches the position of this elevation bracket 30 from another position on the support ring 31, the support roller 29 transfers onto the bracket 30 and performs up and down operation. becomes possible.

The air cylinder 28 operates to move the elevation bracket 30 up and down along the linear guide 32a.
This is done by moving it downward. In the above example, the slide unit 2 was used vertically, but the workpiece 5
Depending on the shape of the unit 2, the unit 2 may be formed horizontally. Furthermore.

While it is possible to have vertical and horizontal slide units, it is also conceivable to have a belt grinding head that does not have such slide units at all.

C: Index Table 1 As explained above, this table 1 is a type of belt grinding head in which a plurality of grinding heads 3 and slide units 2 are integrally formed, each having a belt set to different processing conditions. Three devices are arranged at 90 degree intervals on the outer periphery of the index table 1, and are sequentially rotated and positioned to the processing station.

The index table 1 includes a geared motor 33 with a brake for driving the index, a rotating column 35 coaxially attached to a rotation transmission gear train 34a, 34b that receives the rotation of the motor 33, and a fixed frame 27, which is attached to the fixed frame 27, and the rotating column 35 is mounted above the rotating column 35. a support ring 31 that supports the gear 34b, a positioning cam plate 36 that is coaxial with the gear 34b, a positioning knock 37 that fits into the cam groove of this plate 36, and a positioning knock 37 that supports the knock 37 on its pivot 37.
a knock cylinder 38 that rotates around a, and a knock advance command switch 3 that operates the cylinder 38;
91, a positioning dog 40, and a slip ring 41 for supplying control electricity to each belt grinding head 3.

Thus, the index table 1 is driven by retracting the knock cylinder 38 and moving the knock 37 to the cam plate 36.
When the geared motor 33 with brake is rotated, this rotation causes the rotation transmission gears 34a, 3
Rotating column 35 rotates via 4b.

This rotation is stopped when the positioning barb 40 hits the switch 39 that outputs a command to move the knock 37 forward, and the knock cylinder 38 moves forward, causing the positioning knock 37 to move forward.
Positioning is completed by pushing it into the cam groove of a positioning cam plate 36 fixedly provided on the rotating column 35.

Each belt grinding head 3 positioned at the processing station performs bead removal and grinding work on the workpiece 5 at that position.

Note that other belt grinding heads 3 located at positions other than the processing station remain indexed at that position. Further, the belt grinding head 3 located at a position other than the processing station can perform maintenance work such as replacing the grinding belt 6 at that position.

Furthermore, in the case of the above embodiment, there are four stations for positioning the index table 1, and three belt grinding heads 3 are provided. Changing the number of stations is optional.

Further, instead of the knock advance command switch 39 and the positioning dog 40, an encoder or the like may be attached to count the output pulses and perform positioning.

〔Effect of the invention〕

The present invention is as described above, and includes a plurality of belt grinding heads having different grinding conditions in one belt grinding machine.
Mounted radially on a rotating column with an index table upright, any belt grinding head is rotated and positioned relative to a processing station set at one location, and rough finishing of the same workpiece is performed at the same processing position. This makes it possible to perform final finishing from the beginning, eliminating the need for a large-scale transport and positioning device that was indispensable with conventional equipment for this kind of finishing, and also providing an advantage in terms of equipment space, making it highly practical. The above effect can be obtained.

[Brief explanation of drawings]

Fig. 1 is a plan view of an example of the grinding machine of the present invention, Fig. 2 is a right side view of the grinding machine shown in Fig. 1 with some parts omitted, and Fig.
The figure is a plan view of the belt grinding head, FIG. 4 is an enlarged front view, and FIG. 5 is a view taken along the line V--■ in FIG. 4.

Claims (1)

[Claims] A plurality of slide units 2, which are movable and fixed in the vertical direction, are arranged on the outer periphery of an index table 1 which is configured to perform rotational positioning when the maximum rotation angle is 360 degrees or less, and each of these slide units has a , each of which is equipped with a plurality of belt grinding heads 3 each equipped with a grinding belt selected according to preset grinding conditions and a rotational drive system for the belt. A multi-belt grinding machine characterized in that the belt grinding head 3 of any one of the above is rotationally positioned using an index table to perform grinding.