JPH0539840U - Machine tools with removable pallets of different sizes - Google Patents

Abstract

(57) [Summary] [Purpose] Providing a machine tool that allows pallets of different sizes to be attached and detached so that pallets can be exchanged even when pallets of different sizes corresponding to the size of the work are used. To do. [Structure] When a pallet is transferred, a seating member 11, a seating member 11, is mounted on a pallet fixing portion at a position corresponding to a seating surface 18 of the pallet.
By providing a plurality of 12 and fixing them, pallets of different sizes can be exchanged. Further, when the length of the pallet is long or short at the standby position, the pallet type detecting means 24 discriminates the pallet type, automatically selects the seating surface, and ejects the cleaning air. As a result, it is possible to prevent the air pressure from being reduced due to the air jet from a large number of seating surfaces, which makes it impossible to perform cleaning.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a machine tool for exchanging a pallet on which a work is placed with an automatic pallet changing device, etc., and a pallet having a different size of a placing portion for placing a work on the machine tool by the automatic pallet changing device or the like. The present invention relates to a machine tool capable of attaching / detaching pallets of different sizes which can be fixed and released after being transferred.

[0002]

[Prior Art]

 The time required for the setup work such as the work mounting jigs and work replacements on the table or pallet of a machine tool such as a machining center is stopped. Therefore, there is a processing system that is equipped with an automatic pallet changer (hereinafter referred to as APC) and the like for the purpose of reducing the idle time and improving the productivity. In such APC, while the work on one pallet inside the machine is being processed, the work mounting jig or work corresponding to the next work type is attached to or detached from the other pallet, and the work on one pallet is completed. Then, the external setup work can be performed so that the work on the other pallet can be supplied. This APC is automatically exchanged by alternately loading and unloading two pallets into and out of the machine. When loading the pallet into the machine and positioning and fixing the pallet on the saddle, blow air from the air blow port provided on the saddle side seating surface to the seating surface provided at the bottom of the pallet. It was done after removing dust and cutting agents.

[0003]

[Problems to be solved by the device]

 By the way, as a pallet used in a machine tool with an APC, one kind of pallet of the same size has been conventionally used regardless of the size of the work. For this reason, there was a very wasteful situation in which a pallet of the same size as a large work was used for a small work. Further, since the same size pallet is used regardless of the size of the work, when a large number of pallets are stored, there is a problem that a large space is required for the storage place of the pallets. This invention has been devised in view of such problems, and even when pallets of different sizes corresponding to the size of the work are used, the palettes can be exchanged and different sizes can be exchanged. It is an object of the present invention to provide a machine tool to which a pallet can be attached and detached.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention transfers a workpiece onto a pallet fixing portion of a machine tool by a pallet placing portion of a pallet changing device provided at a position facing the pallet fixing portion. A machine tool in which different sized pallets of different sizes are mounted and different seating surface positions that abut on the pallet fixing portion of the machine tool are attachable / detachable. A seating member that is provided corresponding to the seating surface position of a pallet and a pallet fixing part of the machine tool that can be moved up and down so that the pallet can be transferred when ascending, and the pallet can be moved by descending operation. A pallet fixing member that presses and fixes the seating member in the direction of the seating member, and a pressure fluid supply member that is provided in the seating member when the seating surface and the seating member come into contact with each other. A pressure fluid from a supply source is jetted toward the seating surface of the pallet to provide an air blow port for cleaning the seating surface, and a pallet fixing portion of the machine tool or a pallet mounting portion of the pallet exchanging device. It has a pallet type detecting means for detecting the size of the pallet and a control device for controlling the supply of the pressure fluid to the air blow port according to the size of the pallet detected by the pallet type detecting means. Characterize.

[0005]

[Action]

 With the above configuration, the pallet seating member is installed on the pallet fixing portion corresponding to the seating surfaces of pallets of different sizes. The pallet transferred from the automatic pallet changer side to the pallet fixing part is fixed by the pallet guide. At this time, since the seating members corresponding to the seating surfaces of the various pallets are located below the seating surfaces, the pallets are securely fixed. Further, when the size of the pallet is in the standby position, the pallet type detecting means discriminates the type of the pallet, automatically selects the seating surface, and ejects cleaning air. This prevents the air pressure from dropping from a large number of seating surfaces to reduce the air pressure and prevent cleaning.

[0006]

【Example】

 An embodiment of a machine tool according to the present invention in which pallets of different sizes can be attached and detached will be described below with reference to the drawings. FIG. 1 is an overall side view of a machine tool equipped with a parallel shuttle type APC, and FIG. 2 is a view taken along the line AA of FIG. In FIG. 1, reference numeral 1 is a machining center which is a machine tool. 2 is an APC. Reference numerals 5a and 5b denote two pallet guides provided on the base 2a of the APC 2 in parallel with the conveyance direction of the pallets P1 and P2. A plurality of rollers 8 are rotatably provided on the pallet guides 5a and 5b. ing. Reference numeral 6 denotes a pallet conveying means, which is engaged with engaging members 19 and 29 attached to the pallets P1 and P2 by engaging members 7a and 7b provided on a slider (not shown) which is moved by a cylinder 38. And reprint. This pallet conveying means 6 is a known conveying means for doubling the moving amount of the engaging members 7a, 7b by making the moving amount of the piston rod of the first cylinder 38 double for the rack and pinion mechanism. Is. That is, the base 2a is configured so that two pallets P1 and P2 can be stored on the pallet guides 5a and 5b, and the pallets P1 and P2 are alternately placed on the saddle 9 of the machining center 1 by using the pallet conveying means 6. Carry in or carry out and exchange pallets.

FIG. 2 is a partial cross-sectional view of the vicinity of the saddle 9 of the machining center 1. P1 is a first pallet having a large size of a large work placement part of the two types of pallets, 1a is a first engaging member provided on the first pallet P1, and 18 is a lower part of the first pallet P1. It is the formed 1st seating surface. Reference numeral 16 denotes a pallet guide which is provided on the saddle 9 and clamps the first pallet P1 to the saddle 9 by an ascending / descending operation, 17 a plurality of rollers rotatably provided on the pallet guide 16, and 13 a guide bar. The first pallet P1 is transferred between the pallet guides 5a, 5b and the pallet guide 16 by the pallet conveying means 6.

Reference numeral 9 denotes a saddle, and the pallet guide 16 is moved up and down by a cylinder 14 provided at the center of the saddle 9 and directed upward and downward. That is, the machining center 1 is moved with the pallet guide 16 raised when the first pallet P1 is transferred by the pallet conveying means 6, and the pallet guide 16 is lowered when the first pallet P1 is fixed to the saddle 9. The first pallet P1 is pressed and fixed to the saddle 9 side. 11 and 12 are seating pads that are seating members that are provided on the saddle 9 and have air blow ports 11a and 12a. The seating pads 11 are located at positions corresponding to the first seating surface 18 of the transported first pallet P1. The seating pad 12 is also provided at a position corresponding to a second seating surface (not shown) of the second pallet P2. Reference numeral 10 is a positioning pin. The positioning pin 10 is fitted with a positioning hole 20 formed in the lower portion of the pallets P1 and P2 when fixing the pallets P1 and P2, and the saddle 9 is pallet P1 and P1. Position P2.

Reference numeral 33 denotes a ball screw, which is connected to a servo motor (not shown) and moves the saddle 9 with respect to the base 30 in a direction orthogonal to the pallet transfer direction. Reference numeral 31 is a guide rail fixed to the base 30, and 32 is a slide fixed to the saddle. Reference numerals 11a and 12a denote air blow ports formed in the seating pads 11 and 12, and air holes (not shown) are formed in the saddle 9 up to the end surface of the saddle 9. This air hole is connected to the direction switching valve 22 from the end surface of the saddle 9 via an air supply pipe, and the direction switching valve 22 is supplied with compressed air from an air supply source 21. The direction switching valve 22 switches the supply direction of the compressed air according to the command of the sequencer 23 according to the type of the pallet detected by the pallet type detection member 24, and the compressed air is jetted from the air blow port 11a or 12a. ..

In the pallet conveying means 6, one of the engaging members 7a and 7b at the front end is engaged with the engaging portions 19 and 29 of the pallets P1 and P2 to move the pallets P1 and P2. .. On the APC2 side of the saddle 9, there is provided an auxiliary guide 34 having rollers 34a for supporting the pallets P1 and P2 at an intermediate portion between the pallet guides 5a and 5b of the APC2 and the pallet guide 16 of the machining center 1. And move together. Further, a pallet type detecting member 16 for detecting the types of pallets P1 and P2 is provided on the base 2a of the APC 2, and the type of pallet is detected by the length of the pallet when the pallets P1 and P2 are conveyed, and the sequencer ( The signal is output to the programmable controller 15). That is, in the case of the first pallet P1, the output of the pallet type detecting member 16 is turned on, and in the case of the second pallet P2, the output of the pallet type detecting member 16 is turned off.

In FIGS. 1 and 2, the first pallet P1 (pallet with a large mounting portion) is fixed on the saddle 9, and the second pallet P2 (pallet with a small mounting portion) is on the pallet guide 5a of the APC2. It is placed in. The first seating surface 18 of the first pallet P1 contacts the seating pad 11 of the saddle 9, and is pressed and fixed to the saddle 9 side by the pressing portion of the pallet guide 16. Here, the machining of the work on the first pallet P1 is completed, the attachment of the unprocessed work on the second pallet P2 is completed, and the pallet exchange is performed in the example in which the first pallet P1 and the second pallet P2 are exchanged. Will be explained. In order to carry out the first pallet P1 from the machining center 1, the saddle 9 is moved to a position facing the pallet guide 5b by driving the servo motor. The pallet transporting means 6 is moved by the second cylinder 39 to the neutral position where the engaging portions 7a, 7b of the engaging member 7 are not engaged with the engaging members 19, 29 of the pallets P1, P2. By the first cylinder 38, the engaging member 7 moves forward, the pallet guide 16 is raised, and the fixation of the first pallet P1 is released. After the engaging member 7 is moved forward and then moved to the first pallet P1 side by the second cylinder 39, the engaging portion 7a engages with the first engaging member 19 fixed to the first pallet P1. When the first cylinder 38 is retracted, the first pallet P1 is transferred to the pallet guide 5b and fixed by a fixing pin (not shown).

The saddle 9 moves to a position facing the pallet guide 5a by driving the servo motor. When the pallet conveying means 6 is moved to the pallet guide 5a side by the second cylinder 39, the engaging portion 7b engages with the second engaging member 29 fixed to the second pallet P2. By the forward movement of the first cylinder 38, the second pallet P2 is transferred onto the saddle 9. At this time, the sequencer 23 recognizes that the second pallet P2 is a small pallet based on the output of the pallet type detecting means 24 immediately before transfer, switches the directional control valve 22, and switches the compressed air to the air blow port of the seating pad 12. Let it gush more. The pallet conveying means 6 is moved to the neutral position by the second cylinder 39, and the engaging portion 7b is disengaged by the second engaging member 29 of the second pallet P2. The pallet guide 16 descends, the positioning pin 10 is inserted into the positioning pin hole of the second pallet P2, the seating surface of the second pallet P2 contacts the seating pad 12, and the second pallet P2 is pressed toward the saddle 9 side. And fixed. The ejection of compressed air from the air blow port 12a is stopped. The pallet conveying means 6 retracts, the open / close cover between the machining center 1 and the APC 2 is closed, and the work on the second pallet P2 is processed. On the other hand, the work on the first pallet P1 is removed on the APC 2, and the preparatory work such as mounting of the next work or replacement of the work mounting jig is performed.

Although the pallet type detecting means 24 is attached to the APC 2 side in the above-described embodiment, it may be attached to the machine tool side, that is, the saddle 9 or the like, and may be detected immediately before the clamping operation to the saddle 9 or the like. Further, the pallet type may be determined by reading the pallet information stored in the IC card attached to the pallet or the ID sensor on the APC 2 side or the like.

[0014]

[Effect of the device]

 As described above, the machine tool of the present invention in which different sized pallets can be attached / detached can be fixed by providing a plurality of seating members at positions corresponding to the seating surface of the pallet when the pallet is transferred. By doing so, it is possible to exchange pallets of different sizes. In addition, when the length of the pallet is in the standby position, the pallet type detection means determines the type of pallet, automatically selects the seating surface, and ejects cleaning air to eject air from multiple seating surfaces. Prevents the air pressure from dropping and making cleaning impossible.

[Brief description of drawings]

FIG. 1 is an overall plan view of a machine tool equipped with an automatic pallet changing device of the present invention.

FIG. 2 is a view on arrow AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Machine tool (machining center) 2 Automatic pallet changer (APC) 5 Pallet guide 6 Pallet conveying means 7a, 7b Engaging member 9 Saddle 11 Seating member (seating pad) 12 Seating member (seating pad) 16 Pallet guide 18 First seating Surface 19 Second seating surface 24 Pallet type detection means

Claims (1)

[Scope of utility model registration request] 1. A pallet fixing part of a machine tool is transferred from a pallet mounting part of a pallet exchanging device provided at a position facing the pallet fixing part, and the size of the mounting part on which a work is mounted is different. A machine tool capable of attaching and detaching different sized pallets having different seating surface positions that abut with the pallet fixing portion of the machine tool, the pallet fixing portion of the machine tool corresponding to the seating surface positions of the different sized pallets. And a seating member that is provided in a pallet fixing portion of the machine tool,
A pallet fixing member that allows the pallet to be transferred when rising, and presses and fixes the pallet in the seating member direction by a descending operation; and a piercing hole in the seating member, wherein the seating surface and the seating member are An air blow port for ejecting the pressure fluid from the pressure fluid supply source toward the seating surface of the pallet to clean the seating surface when abutting, and a pallet fixing portion of the machine tool or a pallet mounting portion of the pallet changing device. A pallet type detecting means for detecting the size of the pallet, and a control device for controlling the supply of the pressure fluid to the air blow port according to the size of the pallet detected by the pallet type detecting means. A machine tool capable of attaching and detaching pallets of different sizes characterized by having.