JPS59134643A - Double housing surface grinding machine - Google Patents

Abstract

PURPOSE:To enable a machine to be operated without causing any splash trouble, by mounting a splash guard, whose height can be adjusted in accordance with the height of a work, to a cross rail, supporting a grinding wheel, and a front table, in the case of the double housing surface grinding machine tandem equipping two tables. CONSTITUTION:Front and rear tables 1a, 1b, having a rack engaged with a pinion 3 driven to be rotated respectively in the bottom face, are provided, and the rear table 1b is allowed to perform arrangements in a standby position, for instance, when a work W is under machining by the front table 1a. The work W is machined by a grinding wheel 8 on a wheel head 7 supported to a cross rail 6, and the both tables 1a, 1b are detachably connected by an automatic connector A comprising a hydraulic cylinder 9, collet 13 and a pin 16 or the like. Then a splash guard 4 is mounted to the rear part of the rear table 1b while splash guards 20, 21 are respectively mounted to the rear part of the front table 1a and the cross rail 6 so that height of the splash guards can be adjusted in accordance with the height of the work W.

Description

[Detailed description of the invention] The present invention relates to an improvement of a portal type surface grinder.

As shown in FIG. 1, a conventional portal surface grinder has one table on which a workpiece W is placed. For this reason, after the grinding process is completed, operations such as replacing, centering, and fixing the workpiece W relative to the table 1 must be performed, which inevitably reduces the operating rate of the machine.

Therefore, as shown in Fig. 2, two tables are installed in tandem, and one table is moved back and forth, and while grinding work is being performed, the other table is used to perform work, exchange of unfinished work, and centering. A grinding machine has been devised that can perform continuous machining operations with high efficiency by fixing the machine and moving the waiting table to the machining position immediately after finishing machining.

However, in the case of a portal type surface grinder, the grinding wheel is rotated only in one direction due to grinding accuracy and work environment requirements, and the abrasive grains, chips, and grinding particles generated during the grinding process are Splashes of liquid scatter from the grinding wheel head to one side. If there is a table (hereinafter referred to as the rear table) for preparation on the side where the droplets are scattered (hereinafter referred to as the rear side), the droplets will fall on this waiting table, causing workpiece replacement, centering, etc.
In addition to causing a great deal of trouble in various operations such as fixing the table, it may fall on the bellows that cover the table sliding surface and cause damage to it, or increase the amount of grinding fluid consumed. It is necessary to equip the rear end with a tall splash shield. On the other hand, when moving the rear table to the processing position, the front table must be pulled out from the processing position, but at this time the tall splash guard attached to the rear end of the table moves due to the cross rail. It becomes an obstacle. When raising and lowering the cross rail, it is necessary to reset the cross rail with precision in microns to prevent inclination or twisting, which is not desirable because it takes a long time.

Possible splash shields that do not impede movement of the crossrail include those that are manually removable, extendable, foldable, or that fold and extend in two stages, but the former The latter method is not preferred for automatic operation of the grinding machine, and in the latter case, a sufficient shielding height cannot be obtained. Further, there are disadvantages of poor durability and complexity.

The present invention has been made to solve the above-mentioned problems, and it sufficiently prevents the splashes generated during the grinding of the workpiece on the front table, and also prevents the workpiece from being in the standby position during the grinding process due to the reciprocating movement of one of the tables. The object of the present invention is to provide a portal surface grinding machine that can carry out continuous grinding by attaching and preparing the other table work and immediately moving the unprocessed work to the processing position after completing one process. .

This will be explained below with reference to the drawings. FIG. 1 shows a conventional single-table grinding machine. Reference numeral 1 denotes a table on which a workpiece W is mounted, and it reciprocates above the bed 2.

A pinion 6 meshes with a rack provided on the underside of the table 1 (FIG. 9, 3a) to drive the table 1 back and forth.

4 is attached to the edge of table 1 to prevent splashing.

A column 5 supports the cross rail 6 so as to be movable up and down. 7 is a grinding wheel head supported by the cross rail 6, and 8 is a grinding wheel. In such a grinding machine, as mentioned above, 1
Because there were only two tables, the utilization rate was extremely poor.

FIG. 2 shows a gate-shaped grinding plate according to the present invention. As shown in the figure, two tables are provided: a front table 1a and a rear table 1b. As shown in FIG. 9, the table is driven by a pinion 6 built into the bed 2 that engages with a rack 3a attached to the underside of the table 1a.

Now, returning to FIG. 2, while the workpiece W is being processed on the front table 1a, the rear table 1b is in the standby position, which is the workpiece loading position, and setup work is being performed.

When the processing is completed at the front table 1a, the front table 1a goes to pick up the rear table 1b. That is, this operation is performed by moving the front table 1a backward and docking it with the rear table 1b, as shown in FIG. This docking operation is the 13th
This is done by the automatic table linking device A shown in the figure.

The automatic table coupling device A is installed on the lower surfaces of opposite ends of both tables. In FIG. 13, 9 is a hydraulic cylinder attached to the lower end of the rear table 1b. 10
．． 11 is a pressure oil inlet/outlet, and 12 is a piston. 13 is a collet integrally attached to the end of this piston 12;
4 is a bush that receives pressure from 13. 15
is a guide stand for the collet 13, which is fixed to the lower surface of the rear table 1b. 16 is a pin attached to the lower surface of the front table 1a side.

Collet 1 until tables 1a and 1b are docked.
3 supplies pressure oil from the pressure oil inlet 10 to project approximately 5.0 m to the position shown by the imaginary line in FIG. The outer periphery of the tip of the collet 13 comes off from the bush 14 and expands outward due to the elasticity of the collet itself.

Next, when tables 1a and 1b are docked, pin 16
enters the fret, and when pressurized oil is supplied from the pressurized oil inlet 11, the collet 13 is retracted. At this time, table 1
Even if there is a gap between the joining surfaces 17 of a and 1b, they are pulled together by hydraulic pressure until they are completely joined. This connection is confirmed by a limit switch (not shown).

The pinion 6 is driven by the connection completion signal, and the tables 1a and 1b move forward. During the forward movement, the pinion 3 moves from the rack 3a of the table 1a to the rack of the table 1b, and conversely pushes the table 1a (FIG. 4).

When it approaches the standby position of the table 1a in FIG. 4, it decelerates and stops with a stop positioning accuracy of, for example, 0.1 mm. A proximity switch 18 is attached to the verade 2 for deceleration, and a magnetic sensor 19 is attached for stop positioning.

When the chill pull stops, the cholera (cholera) 13 is protruded and the swing connecting device fA is brought into an unclamped state. Then, as shown in FIG. 5, the table 1b is moved to the processing position, leaving the table 1a behind. The table 1b starts the machining work, and the table 1a starts the work of loading and unloading the workpieces W and grading them for centering.

In the above series of operations, the splash guard 20 on the rear side of the table 1a passes under the cross rail 6.

Similarly, even if a problem occurs during the grinding process such as the limit switch for reversing the table not operating, the splash shield 20 must be allowed to pass under the grindstone 8 without interfering with the grindstone 8. In this case, it becomes necessary to be able to adjust the height of the splash shield in the vertical direction depending on the height of the workpiece. Along with this, the upper part splash shield 21 is also adjusted in accordance with the lower part height.

In the illustrated example, the lower droplet guard 20 is driven by a lifting screw shaft 22 using a manual handle, and the upper droplet guard is similarly driven by a motor using a screw shaft. Note that the lower splash guard 20 cannot cover the machining heights and entire strokes of many types of workpieces, so prepare it as shown below.
Be prepared to handle each type of processing. The adjustment operation of the upper splash shield 21 can also be automated by program commands by using a positionable drive/control device.

As described above, two tables are installed in tandem so that they can be connected and disconnected, and the inverted-shaped droplet is mounted on a cross rail so that its lower end is approximately at the same height as the lower end of the grinding wheel. In addition, a splash guard with the same height as the workpiece height is removably attached to the rear end of the front table, so grinding work can be carried out continuously without splash problems.
This enables extremely efficient processing.

[Brief explanation of the drawing]

Figure 1 shows a conventionally known grinding machine. Fig. 2 shows a grinding machine according to the present invention in a state in which the front table is in the middle of grinding.1) Fig. 3 shows a state in which the front table has completed grinding and is connected to the rear table. FIG. 4 shows a state in which the front and rear tables are connected and stopped at the front pull standby position. FIG. 5 shows a state in which the front table has been separated and the rear table has been moved backward to the grinding position. FIG. 6 shows the state in which splashes are generated by the grinding wheel. 7 and 8 are detailed views of the front table and the rear table. FIG. 9 is a detailed diagram of the table feeding mechanism. FIG. 10 is a view taken along the line A-A in FIG. 7. 11 and 12 show a position control method when the front table and the rear table are connected. FIG. 13 is a detailed diagram of the automatic table coupling device. Figures 14 to 16 show different types of splash protection.
This shows that it is possible to respond to changes in the height of the workpiece W. In the figure; A Table automatic coupling device W Workpiece 1 Table
1a Front table 1b Back table
2 Bed 5 Pinion 3a Rack 4 Splash guard 5 Column 6 Cross rail 7 Grinding wheel head 8 Grinding wheel 9 Hydraulic cylinder 10, 1
1 Oil inlet/outlet 12 Piston 13 Collet 14 Bush 15 (collet) guide stand 16 Pin 17 (between front and rear tables) gap 18 (for table standby position) limit switch 19
Magnetic sensor 20 (back side of front table 1a) Splash shield 21 (for upper part)
More than splash protection Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A gate equipped with a cross rail that is held movably in the vertical direction by a column, one or more grindstone heads that are provided on the front side of the cross rail so that it can be raised and lowered, and a table that can be reciprocated by a drive device. In a die surface grinding machine, two tables are equipped in tandem so that they can be connected and disconnected freely, and an inverted-shaped splash guard is installed whose lower end position is approximately the same as the lower end of the grinding wheel.
A gate-type surface grinding machine characterized in that it is mounted on a cross rail so that it can be driven up and down to the desired height, and that a splash shield with the same height as the workpiece height is detachably mounted on the rear end of the front table.