JPS6279941A - Chip raking-out device for pallet replacing apparatus - Google Patents

Abstract

PURPOSE:To automatically rake out chips and recover them by installing a chip receiving box having a chip discharge port on the semicylindrical receiving plate under a pallet receiving board and a coolant discharge port in the lower part and further installing a chip taking-out member which slides on the inner surface of the above-described receiving plate at the top edge of the pallet receiving board. CONSTITUTION:A workpiece after the completion of working, chips on a pallet, and coolant are dropped onto the receiving plate 31 of a chip receiving box 30 by the turn of a pallet receiving board 20. Then, a pallet onto which the workpiece not yet worked is installed is transported into a machine tool and then indexed to a pallet replacement position by turning the pallet receiving board 20. In this turn, almost all the coolant is discharged from a discharge port 34, and the chips on the receiving plate 31 from which coolant is separated are raked out by a chip raking-out member 38 which turns with the pallet receiving board 20, and recovered into the container such s chip recovering trolley from a chip discharge port 33.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an apparatus for exchanging a pallet on which a workpiece machined by a machine tool is mounted with a pallet on which an unprocessed workpiece is mounted, and in particular, an apparatus for exchanging a pallet on which a workpiece machined by a machine tool is mounted, and a pallet on which an unprocessed workpiece is mounted. This invention relates to a pallet exchange device with a function of collecting powder.

[Prior art]

This type of pallet changing device is disclosed in Japanese Patent Application Laid-Open No. 60-2926.
In the technology disclosed in Publication No. 2, by rotating a pallet holder that supports a plurality of pallets, the pallets at the exchange position relative to the machine tool can be exchanged, and at the same time chips from the machined workpiece can be removed downward. The pallet is cleaned by dropping it into a chip receiving box installed at the top of the pallet.

[Problem that the invention seeks to solve]

In such conventional technology, chips and cutting coolant are collected at the same time in the chip receiving box, so the chip receiving box has a special structure using a wire mesh or the like to separate the two.
Every time a predetermined amount is accumulated, the chips must be taken out and transferred to another container, which requires a lot of effort to dispose of the chips. Another idea is to use a mesh belt conveyor to separate the chips from the coolant and automatically collect them, but this would complicate the structure and require a special drive source for the belt conveyor. There was a problem. The present invention attempts to solve these problems.

[Means for solving problems]

For this purpose, the chip scraping device of the pallet exchange device according to the present invention is rotatably supported on the machine frame 11 so as to be rotatable around the horizontal axis 0, and has a plurality of chips parallel to the horizontal axis 0, as illustrated in the embodiment of the accompanying drawings. support surface 20a.

20b, and the pallet holder 20 is driven to rotate around the horizontal axis 0, and the support surface 20a is rotated around the horizontal axis 0.
. received plate 3
Chip discharge port 3 provided at one end edge in the circumferential direction of the receiving plate
3 and a chip receiving box 30 having a coolant discharge port 34 opened at the bottom; and a chip scraping member fixed to the pallet holder 20 in the radial direction and having a tip edge 38a sliding on the inner surface 31a of the receiving plate 31. 38.

[Effect]

The pallet holder 20 supports the pallet loaded with the machined workpiece carried out from the machine tool by placing it on the support surface indexed to the pallet exchange position, and then moves it to the indexing device 40.
The pallet with the next unprocessed workpiece mounted thereon is indexed to the pallet exchange position. Due to this rotation, the processed workpiece and the chips and coolant on its pallet fall onto the receiving plate 31 of the chip receiving box 30. Next, after loading the pallet with unprocessed workpieces into the machine tool,
The pallet holder 20 is rotated again and the pallet with the processed workpiece mounted thereon is indexed to the pallet exchange position. During this rotation, most of the coolant has already been discharged from the coolant discharge port 34, and the chips on the receiving plate 31 from which the coolant is separated are removed by the chip scraping member 38, which rotates together with the pallet holder 20. The powder is scraped out and the chip discharge port 33
The chips are collected in a container such as a chip collection vehicle. Next, after replacing the processed workpiece with an unprocessed one, the pallet holder 2
0 rotates again to index the empty support surface to the pallet exchange position, ready to receive the pallet to be removed from the machine tool.

〔Effect of the invention〕

As described above, according to the present invention, the chips from which most of the coolant has been separated can be automatically scraped out and collected, so that the labor required for processing the chips, including the subsequent processing, can be reduced. can.

Moreover, the structure is simple because the chip scraping member is fixed to the pallet holder and operated using its rotation.
There is no need for a special drive source for scraping out chips.

〔Example〕

Examples of embodiments shown in the accompanying drawings will be described below.

As shown in FIG. 1, bearing members 12 and 13 having a common horizontal axis O are fixed to both sides of the upper part of the machine frame 11 installed on the floor surface 10, as shown in FIG. Rotating shafts 25 and 26 fixed to project from both ends of the pallet holder 20 in the longitudinal direction are rotatably supported on the members 12 and 13. In the illustrated embodiment, the pallet pedestal 20 has two support surfaces 20a, 20b formed back to back in parallel with the horizontal axis 0, each support surface 20.20b having a support roller 22 and a guide roller 23. A support rail 21 is provided, each baren) PL.

P2 is supported slidably in the longitudinal direction. Clamp devices 24 for fixing the bars 1-PL and P2 are provided on both sides of the pallet pedestal 20.

The pallet holder 20 is rotationally driven by an indexing device 40 so that its support surfaces 20a and 20b are indexed to a predetermined pallet exchange position.
a shows the state determined by the pallet exchange device. Each member of the indexing device 40 is designated by reference numerals 41-47, and the hydraulic motor 41 is connected to a driving sprocket 42. chain 4
3 and a driven sprocket 44 fixed to the pivot shaft 25, the pallet pedestal 20 is rotationally driven in the counterclockwise direction in FIG. detects and stops rotation,
The positioning device 45 presses the positioning roller 45b at the tip of the reciprocating rod 45a against the engagement recess 44a on the outer periphery of the boss portion of the driven sprocket 44, and the support surface 2 of the pallet holder 20
0a and 20b are determined to be pallet exchange positions. As shown in FIG. 2, on the upper side of the machine frame 11 there is a pallet carry-in port for carrying the pallet P1 at the pallet exchange position into and out of the machine tool (not shown) through the intermediate rail 55. An unloading device 50 is provided, which includes a chain 52 stretched between a pair of sprockets (only one sprocket 51 is shown) and driven by a drive device, and a chain 52 that is attached to the chain 52 and carries a pallet P1 at a pallet exchange position. Hook 53 that engages with retaining member Pa
It is made up of.

Next, the chip receiving box 30 and the chip scraping member 38, which are the main components of the present invention, will be explained. The chip receiving box 30 is
As shown in FIGS. 1 and 2, a receiving plate 31 formed in a semi-cylindrical shape centered on the horizontal axis O below the pallet pedestal 20 and a pair of side plates 3 fixed on both sides of the receiving plate 31 in the axial direction
2 and 32, and is fixed to the machine frame 11.

One end edge in the circumferential direction of the receiving plate 31 on the right side in FIG. A square gutter-shaped discharge guide Fi35 is provided.

A coolant discharge port 34 having a wire mesh 34a is opened in the side plate 34, located on the inner surface 31a side of the lower part of the receiving plate 31.

In this embodiment, the chip scraping member 38 has two openings as shown in FIGS.
, 20b, and are fixed to protrude from the pallet holder 20 in the radial direction so as to be parallel to the pallet holders 20. Each chip scraping member 3
Reference numeral 8 indicates a plate-shaped bracket 38b whose base end side is fixed to both side edges of the pallet holder 20, and a sliding contact plate 38c made of a flexible elastic material such as rubber fixed to the tip side of the bracket 38b.
It is made up of. As shown by the arrow in FIG. 1, when the chip scraping member 38 rotates counterclockwise together with the pallet holder 20, the tip edge 38a of the chip scraping member 38 formed by the outer edge of the sliding contact plate 38c , moves toward one edge in the circumferential direction that comes into sliding contact with the inner surface 31a of the receiving plate 31 and forms the chip discharge port 33. As shown in FIG. 1, the tip side of the bracket 38b is bent so as to face backward with respect to the moving direction, and as shown in FIG. It is smaller than.

Next, the operation of this embodiment will be explained. During machining of the machine tool, the empty support surface 20a of the pallet holder 20 is indexed to the upper pallet exchange position, and the opposite (lower) support surface 20b is used as a barre with an unprocessed workpiece attached. P2 is waiting in a supported state. When the machining is completed, the pallet P1 loaded with the machined workpiece is carried out from the machine tool by the pallet carry-in/out device 50, carried onto the support surface 20a, and fixed by the clamp device 24.

Following this, the indexing device 40 operates and the pallet cradle 20
is rotated 180 degrees counterclockwise in FIG. 1, so that the pallet P2 with the supporting surface 20b and the unprocessed workpiece mounted thereon is indexed to the upper pallet exchange position, and the processed workpiece is mounted. Pallet P1 is in the lower position. Due to this rotation, the processed workpiece, chips and coolant on the pallet Pl fall onto the receiving plate 31. Then,
After releasing the clamping device 24 of the pallet P2 on which the unprocessed workpiece is mounted and carrying the same pallet P2 into the machine tool from the pallet exchange position by the pallet m person carrying out device 50, the indexing device 40 is activated. The pallet pedestal 20 is rotated 180 degrees counterclockwise, the pallet P1 with the machined workpiece mounted thereon is indexed to the pallet exchange position, and around this time, the machine tool starts machining. During this rotation, most of the coolant that has fallen onto the receiving plate 31 has already been discharged from the coolant discharge port 34, and the tip edge 38 of the chip scraping member 38 that rotates together with the pallet pedestal 20
a slides against the inner surface 31a of the receiving plate 31, moves toward the chip discharge port 33, scrapes out mainly only the chips on the receiving plate 31, and passes the chips from the chip discharge port 33 through the discharge guide plate 35. The powder is collected in the powder collection vehicle 14. Next, after replacing the processed workpiece on the pallet P1 at the pallet exchange position with an unprocessed workpiece, the indexing device 40 is activated to rotate the pallet pedestal 20 by 180 degrees counterclockwise. For example, it returns to the standby state mentioned at the beginning of this operation description. During this rotation, the chip scraping member 38 also scrapes out some chips remaining on the receiving plate 31 and collects them into the chip collecting vehicle 14. This device repeats the same operation every time the machine tool finishes machining, scrapes out the chips that fall into the chip receiving box 30, from which the coolant has been separated, and collects them in the chip collection vehicle 14.

Note that the number of support surfaces provided on the pallet pedestal 20 is not limited to two as shown in the above embodiment, but may be four or any other suitable number, and in that case, the number of support surfaces provided is determined according to the number of support surfaces. Just change the rotation angle. Further, the number of chip scraping members does not need to match the number of supporting surfaces, and may be set to be half the number of supporting surfaces, for example.

[Brief explanation of drawings]

The drawings show an embodiment of a chip scraping device for a pallet changing device according to the present invention, with FIG. 1 being a side sectional view of the entirety and FIG. 2 being a plan view of the entirety. Explanation of symbols 11...Machine frame, 20...Pallet cradle, 20a, 2
0b... Support surface, 30... Chip receiving box, 31... Receiving plate, 31a... Inner surface, 33... Chip discharge port, 34...
...Coolant discharge port, 38...Chip scraping member,
38a... Tip edge, 40... Indexing device, 0... Horizontal axis line.

Claims (1)

[Claims] a pallet cradle rotatably supported on a machine frame around a horizontal axis and having a plurality of support surfaces parallel to the horizontal axis; and a pallet cradle rotatably driven around the horizontal axis to set the support surfaces in a predetermined position. a pallet exchange device comprising an indexing device for indexing to a pallet exchange position; a chip receiving box having a chip discharge port provided on one end edge in the circumferential direction and a coolant discharge port opened at the bottom thereof; and a chip receiving box fixed to the pallet holder in a radial direction and having a leading edge on the inner surface of the receiving plate. A chip scraping device for a pallet exchange device, characterized by comprising a sliding chip scraping member.