JPH0567373B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a machine tool with a pallet changing device that simplifies the installation process.

[Conventional technology] Conventionally, when machining a workpiece with a machine tool, in order to shorten the machining time (including setup time), a pallet on which the workpiece is placed and fixed is moved back and forth between the machine tool and the pallet. For this reason, machine tools were equipped with pallet changing devices that automatically fed and discharged workpieces.

Conventionally, various methods have been used as pallet exchange equipment, but among them, a method in which pallets are directly exchanged along a circular path between the machine table and the bodywork using a pallet rotation device is one that reduces exchange time and This is advantageous in terms of occupied space.

[Problems to be Solved by the Invention] By the way, when this type of pallet changing device is installed in a machine tool, (1) the pallet changing device is installed with approximately positioning with respect to the machine tool. (2)
The centering and positioning of the rotating device of this pallet changing device with respect to the machine table, and the centering and positioning of the mounting device for setting workpieces on pallets with respect to this rotating device are performed in this order. This item (2)
Centering work is difficult because the machine tool body, pallet rotation device, and bodywork device are fixed to the base.
Centering and adjustment required considerable skill and time.

Therefore, the present invention focuses on providing a common board for integrally fixing the mounting device and the pallet rotating device, and aims to provide a machine tool having a pallet changing device that can simplify the installation process.

[Means for solving the problems] A machine tool having a pallet changing device of the present invention has the following features:
A machine tool main body having a table on which a pallet is placed, a pallet turning device having a turning shaft that engages the pallet in a removable manner on both sides of the turning center, and a table of the machine tool main body centered around the pallet turning device. In a machine tool having a pallet changing device equipped with a mounting device disposed in symmetrical positions and mounting a pallet, the pallet turning device and the mounting device have a common board that integrally fixes both, The common substrate is configured to be fixed to the base so that its relative position can be adjusted.

The machine tool having the pallet changing device of the present invention is
It consists of a machine tool body, a pallet rotating device, a mounting device, a base, and a common board.

Machine tools are mainly machines that cut and grind workpieces, but also include machines that perform press forming in a broad sense. Examples of the machine tool body include lathes, milling machines, grinding machines, machining centers, press machines, and the like.

A pallet rotating device is a device that has a pivot center and an arm extending from the pivot center, and moves a pallet that engages with the arm by pivoting the arm. Here, a pallet is a pallet that holds a workpiece in a removable manner, is supplied to the machine tool body together with the workpiece, and is moved to the workpiece loading/unloading position of this pallet exchange device after a predetermined machining is completed. It is a member that As a means for fixing the workpiece to this pallet, for example, bolt tightening, hydraulic tightening, etc. can be used. Further, this pallet exchange device has a drive device for rotating this arm, and as the drive device, a known technique using an actuator such as a motor or an air cylinder can be used. The pallet exchange device has guide members such as rails and guide grooves for guiding the pallets along a predetermined circular path.

The mounting device is a device for attaching and detaching workpieces to and from pallets. It is desirable for this mounting device to rotate and move the pallet in order to improve workability when placing workpieces on the pallet. The mounting device preferably has a moving part that allows this movement to be performed smoothly without manual intervention. Conventional techniques such as cylinders and motors can also be used for this moving device.

The common board is a member that holds the pallet turning device and the mounting device and is fixed to a base fixed to the machine tool body so that its relative position can be adjusted. Here, the adjustment of the relative position refers to the positional relationship in the front-back direction and the left-right direction.

[Operation] In the machine tool having the pallet exchange device of the present invention, first, the base is fixed and held at a predetermined position on the machine tool body. Next, the pallet turning device and the mounting device are positioned relative to each other and fixed to the common board. After this, the relative position of this machine tool body and pallet rotation device is determined on the base fixed to the machine tool body,
Fix the common board. The relative position of the common substrate to the base can be adjusted. Therefore, positioning of the machine tool body and the pallet exchange device can be done smoothly. In addition, even if the common board is adjusted to align the rotating arm of the pallet rotating device with the pallet on the machine tool table, the positional relationship between the rotating arm of the pallet rotating device and the pallet on the bodywork will not be correct. The positional relationship between the machine tool table, pallet turning device, and mounting device can be easily adjusted without collapsing.

[Example] Hereinafter, a machine tool having a pallet exchange device of the present invention will be described in detail based on a specific example.
FIG. 1 is a sectional view showing in detail the structure of the pallet changing device in a machine tool having this pallet changing device according to a specific embodiment.

A machine tool having this pallet exchange device is composed of a machine tool main body 10, a base 20, a pallet turning device 30, a mounting device 40, and a common board 50.

The machine tool body 10 has a slidable machine table 11 having an index table 13 held on a bed 12. An arc-shaped clamp rail 15 that slidably engages the pallets 35 and 36 is provided on the indexing table 13 so as to be movable up and down.As the clamp rail 15 rises, the pallet is unclamped, and as it descends, the pallet is indexed. It is clamped to the table 13.

The base 20 is composed of a casting connection base 21 fixed to the bed 12 of the machine tool body with bolts and dowel pins.

The common board 50 is located on the flat surface 2 of this connection base 21.
2, and is held so that it can be positioned with degrees of freedom △x and △y in the left-right direction and front-back direction on this plane 22, respectively, and when the predetermined position is set, it is tightened and fixed with bolts. be done.

The pallet rotating device 30 includes a fixed shaft 31 fixed to the common board 50, a rotary cylinder 32 that rotatably inserts the fixed shaft 31, and has a pinion gear 32 in its lower part, and meshes with the pinion gear 32N. This pinion screw 3 transfers the operating force in the longitudinal direction.
Rack piston 33 that applies rotational force to 2N
Although not shown, there is a hydraulic cylinder that moves the rack piston 33 back and forth, a fixed shaft case 34 that holds the rack piston 33 and is fixed to the common board 50, and a shaft case that is fixed to the rotary cylinder 32 and has pallets at both ends. Engagement hook 3 fixed to 35, 36
An arm portion 371 that removably engages with 51, 361,
drive plate 37 with 372 and fixed shaft 31
The guide plate 38 is fixed to the pallets 35 and 36 and engages with engagement rollers 352 and 362 attached to the pallets 35 and 36 to prevent the pallets from falling during replacement. Arm portion 37 of drive plate 37
1,372 are engaged with and disengaged from the pallet engaging hooks 351, 361 by raising and lowering the clamp rail 15 described above and the support rail described later.

The bodywork device 40 includes a case 455 fixed to the common board 50 at a position spaced apart from the fixed shaft case 34 by a predetermined distance, and a bearing 45 attached to the case 455.
1,452, a rotating shaft 453 fixed to the upper end of this rotating shaft 453, a support rail 41A supported on this rotating plate 42 so as to be movable up and down, and this support. Lifting cylinder 45 that lifts and lowers the rail 41A
6, a positioning cylinder 457 for removably engaging an engagement pin in an engagement hole formed in the swivel plate 42, and a positioning cylinder 457 installed on the swivel plate 42 and removably fitted into the recesses 35H of the pallets 35, 36. It is composed of a matching knock pin 46.

The support rail 41A has a support roller 410.
The pallet is slidably supported through the rails R and 410L, and like the clamp rail 15 described above, it has an arc shape centered on the rotary cylinder 32 of the pallet rotating device 30, and is designed to allow the pallet to move in the radial direction. It is formed with a narrow width. The pallet supported by the support rail 41A is detached by the knock pin 46 when the support rail 41A is raised, and is fitted into the knock pin 46 when the support rail 41A is lowered to prevent it from rotating relative to the pivot plate 42. The turning plate 42 can be turned to a desired angular position in a state in which the positioning cylinder 457 is released so as to improve the workability when an operator attaches a workpiece to a pallet. Also, the common board 50 and the machine table 11
Support rails 41B to 41E having the same shape and the same height as the support rail 41A are installed above, and the machine table 11 is positioned at a predetermined position for pallet exchange as shown in FIG. The clamp rail 15 and the support rails 41A to 41E form a circular path centered on the pallet turning device 30. FIG. 3 is an explanatory diagram when centering the common substrate 50 by moving it in the front-rear direction and left-right direction with respect to the base 20. Base 2
A long hole 55N is provided in the common board 50, which is larger than the leg of the bolt 26B screwed into the tapped hole 25N. The common substrate 50 is moved relative to the base 20 by the degree of freedom of this elongated hole 55N, and centering is performed.

The process of installing a machine tool having a pallet changing device constructed in this way is carried out as follows. Plane 22 of the connecting base 21 fixed to the machine tool
A common board 50, on which the pallet rotating device 30 and the mounting device 40 are fixed at a predetermined distance, is fixed. At this time, the pallet turning device 30, the bodywork device 4
Since the relative position of 0 is assembled within the tolerance in the manufacturing process, simply aligning the common board 50 with the reference point (plane) of the machine table 11 will complete the installation process of this machine. is completed.

According to this embodiment, a common board is provided to hold the pallet turning device and the bodywork fixed at a predetermined distance, and this common board is fixed to a connection base connected to the machine body. Installation of the pallet exchange device is completed by simply setting the distance to the reference point of the machine table. Therefore, there is no need for the conventional process of positioning and centering the machine body, pallet rotating device, and mounting device, and the pallet exchange device can be centered quickly. Furthermore, processing errors in the connection base can also be absorbed by adjusting the common base. In other words, connection-based processing costs can be reduced.

In this embodiment, a base 20 is provided which is connected to the bed 12 of the machine tool.The bed 12 and the base 20 are integrated as a base, and the bed of the machine tool and the common board are mounted on this base. It is also possible to fix.

[Effects of the Invention] According to the present invention, a machine tool having a pallet changing device consisting of a machine tool body, a base, a pallet turning device, and a mounting device is provided with the pallet turning device and the mounting device. The pallet changing device can be installed by fixing the machine tool body to the base and then using the common board to adjust the relative position of the common board to the base. All you have to do is fix it on a stand and adjust its relative position. In addition, even if the common board is adjusted to align the rotating arm of the pallet rotating device with the pallet on the machine tool table, the positional relationship between the rotating arm of the pallet rotating device and the pallet on the bodywork will not be correct. It does not collapse, and the positional relationship between the machine tool table, pallet turning device, and mounting device can be easily adjusted. Furthermore, since the common board is fixed to the bed of the machine tool, the mounting standards for the rotating arm on the common board and the machine tool table are the same.
It is possible to reduce the positional deviation between the rotating arm and the machine tool table in the height direction and the lateral direction, and there are effects such as being able to easily adjust the position of the above-mentioned common board.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a machine tool having a pallet changing device according to a specific embodiment of the present invention. FIG. 2 is a plan view showing the configuration of a pallet exchange device and a mounting device used in the same embodiment. FIG. 3 is an explanatory diagram when the common substrate is positioned relative to the base used in the same embodiment. 10...Machine tool body, 20...Base, 30...
...Pallet turning device, 40...Bodywork device, 50...
...Common board.

Claims (1)

[Claims] 1. A machine tool main body having a table on which a pallet is placed, a pallet turning device having a turning shaft that removably engages the pallet on both sides of the turning center, and a table of the machine tool main body centered around the pallet turning device. A machine tool having a pallet changing device including a pallet rotating device and a mounting device arranged symmetrically with a pallet mounting device, the machine tool having a common board that integrally fixes both the pallet rotating device and the mounting device; A machine having a pallet changing device, characterized in that the common base is fixed on a machine base fixed to the bed of the machine tool main body so that the relative position of the machine tool main body to the table can be adjusted. machine.