JPH044089B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a machine tool that positions and fixes one of many types of pallets at an appropriate processing position and processes a workpiece placed on the pallet. Regarding.

<Prior Art> Conventionally, a machine tool is known in which a tool magazine is installed near a machining unit and tools are exchanged between the tool magazine and the main shaft of the machining unit.

However, in order to change tools in such conventional machine tools, it is necessary to provide an extra tool magazine to store tools and a transfer arm to transfer tools between this tool magazine and the spindle, which requires installation space. , it is disadvantageous in terms of cost, and especially in the case of workpieces that have multiple machining locations, the tool must be replaced many times, and the time required for this becomes idle time and reduces machining efficiency. There were flaws.

In order to eliminate these drawbacks, a pallet is positioned and fixed at the machining position with the tools necessary for machining the workpiece set in advance, and the spindle is inserted and connected to the tools on this pallet, resulting in a short machining process. JP-A-Sho has already created a machine tool that allows tools to be changed on time.
It is proposed as No. 57-168808.

However, since the machine tool proposed above has a single-axis configuration, it is necessary to machine each hole one by one, resulting in a longer machining time. A machine was required.

<Object of the Invention> The present invention has been made to satisfy such a need, and its object is to simultaneously machine a plurality of holes to shorten the machining time.

Another object of the present invention is to easily accommodate changes in the pitch between the shafts due to pallet exchange. Furthermore, another object of the present invention is to simplify the construction by exchanging tools for each pallet, and to improve machining accuracy by supporting the tool during machining in the support hole of the pallet. That's true.

<Examples> Examples of the present invention will be described below based on the drawings. In FIGS. 1, 2, and 3, M indicates a machine tool of the present invention. A conveyor C is installed in front of this machine tool M, and an unprocessed workpiece W is transported in front of this machine tool M. The workpiece W is transported to the loading/unloading position RP, and the processed workpiece W transported to the loading/unloading position RP is transported to the next process. There is a transport trolley TC behind the machine tool M.
has stopped. This carrier TC takes out the used pallet P from the machine tool M, and also supplies the pallet P to be used next to the machine tool M. When supplying and discharging, the machine tool M stops at a replacement position CP near the machine tool M, and after replacement, it travels along the running path L and stores the pallet P in the storage device as appropriate.
It is now used to store.

The machine tool M includes a bed 10, on which a processing unit 11 and a jig device 1 are mounted.
2 are installed facing each other. The processing unit 11 has a fixed table 13, and a feed table 14 is mounted on this fixed table 13.
is mounted so as to be slidable in the X direction by a servo motor 15. On this feed stand 14 is a headstock.
SH1 and SH2 are mounted at a slight interval in the Y direction, and the main spindles S1 and SH2, which are rotationally driven by rotary drive motors M1 and M2, are mounted on the headstocks SH1 and SH2.
S2 is rotatably supported around an axis parallel to the sliding direction of the feed base 14. Of the two headstocks SH1 and SH2, the main spindle SH1 is directly fixed on the feed base 14, and the headstock SH2 is mounted on a slide base 19 that is slidable in the Y direction. Servo motor 20
By sliding the main shaft S1,
The interval of S2 can be adjusted.

On the other hand, the jig device 12 has a pallet P and a jig base 25. A large number of pallets P are prepared depending on the type of workpiece W, and one of them is set at the machining position MP by the positioning clamp device 30 shown in FIG.
is clamped for positioning. This positioning clamp device 30 includes a lifting body 31 and a lifting body 31.
When the lifting body 31 is raised, the pallet P can be easily carried in and out using the lifting body 31 as a guide, and by lowering the lifting body 31, the pallet P can be moved up and down. It is firmly positioned and clamped onto the jig base 25 by the elevating body 31.

The shape of the pallet P is U-shaped, with a mounting part for supporting the workpiece W in the center and protrusions 35 at both ends. The tool T is supported so that it can be rotated and inserted while being held on both sides. The taper portion 37 of the tool T is projected outward from the pallet P toward the machining unit 11, and the taper portion 37 and the spindles S1, S2 are attached and detached by a fastening means such as a drawing bar. It's summery. A plurality of the tools T are prepared on one pallet P, and a predetermined pitch is secured between them. This pitch is set to be equidistant from the distance between the centers of the machining holes WH of the workpiece W placed on that pallet P, and on other pallets P, the distance between the centers of the machining holes WH of the workpiece W placed on that pallet P is set to be equal. hole
The pitch also differs depending on the difference in the center-to-center distance of the WH. Therefore, by using this pallet P properly, it is possible to deal with various workpieces W.

Further, a lifter 40 is provided on the pallet P so as to be movable up and down. This lifter 40 is a jig base 2
When the tool T is inserted into or extracted from the machined hole Wa of the workpiece W, the workpiece W is lifted from above the pallet P by the lifter 40. , to prevent damage caused by the cutting tool 45 to the inner surface of the machined hole. The lifter 40 and the piston rod 42 of the lift cylinder 41 are configured to be removable through a T-groove or the like, so that they do not pose an obstacle to the loading and unloading of the pallet P.

Further, 50 is a clamper that clamps the workpiece W onto the pallet P.

The operation in the above configuration will be explained.

The drawing shows a state in which a pallet P is positioned and clamped at a machining position MP, and two machining holes WH of a workpiece W clamped onto the pallet P are being machined simultaneously by a tool T. At this time,
The tool T is rotatably supported in the support hole 47, and since the long tool T is less likely to run out, the machined hole WH can be machined with high precision.

When the machining is completed, the clamper 50 is first loosened by an appropriate device, and then the workpiece W is lifted upward by the lifter 40. At this time, the cutting tool 45 on the tool T is stopped facing upward as shown in FIG. 4, and the cutting tool 45 is slightly separated from the processing surface. In this state, by moving the feed table 14 backward in the X direction by the servo motor 15, the tool T can move the support hole 47 of the pallet P and the machined hole of the workpiece W without making a tool mark in the machined hole WH.
Extracted from WH.

Thereafter, the processed workpiece W is carried onto the conveyor C by an unillustrated carry-in/out device, and the unprocessed workpiece W carried by the conveyor C is carried onto the pallet P. . Feeding platform 14 after loading
is advanced in the Y direction, the tool T is inserted into the support hole 47 of the pallet P and the machined hole WH of the workpiece W, and then the lifter 40 and the workpiece W are lowered together by the lift cylinder 41. be done. After descending, the clamper 50 is moved again by an appropriate device.
is operated in the tightening direction, and the workpiece W is firmly fixed onto the pallet P. Then the rotation drive motor M
1 and M2 rotate the main shafts S1 and S2 at the same time, and the two machining holes WH are machined at the same time.

Thereafter, as soon as the machining of the workpiece W is completed, the machining of the workpieces W is performed one after another using the above operation.When machining of a certain number of workpieces W is completed, and then machining of a different type of workpiece W is performed. In this case, the pallet P needs to be replaced. In this case, first,
After the last workpiece W is carried out, the feed table 14 is moved forward, and the tool T is inserted into the support hole 47 of the pallet P without the workpiece W. After insertion, spindle S
Since the fastening devices in 1 and S2 are operated to release the tool T, only the headstocks SH1 and SH2 are retreated in the Y direction with the tool T remaining on the pallet P.

Thereafter, the positioning clamp device 30 is operated, so that the pallet P is lifted from the jig base 25 and brought into an unclamped state. Thereafter, the used pallet P, while supporting the tool T, is guided by the elevating body 31 and transported onto the carrier TC by a shift device (not shown). The carrier TC that receives the pallet P travels on the travel path L and stores it in the storage device. In parallel with this, the pallet P to be used next is taken out from the storage device by another carrier TC, further travels along the travel path L, and stopped at the exchange position CP. Then, the pallet P on the carrier TC is shifted to the processing position MP by an unillustrated shift device while being guided by the elevating body 31, and then the pallet P is lowered by the elevating cylinder 32, thereby shifting the pallet P to the processing position MP. P is positioned and clamped on the jig base 25.

In parallel with the above operation, on the processing unit 11 side,
The slide base 19 is moved in the Y direction by the servo motor 20, and this movement causes the main shafts S1 and S2 to move.
The interval is set to be the same as the center-to-center pitch of the machined holes WH of the workpiece W on the pallet P. After the pitch between the shafts has been adjusted, the feed base 14 is moved by the servo motor 1.
5 in the X direction, and the tools T are inserted into the main shafts S1 and S2, respectively. Thereafter, the feed table 14 retreats in the X direction, so that the tool T is extracted from the support hole 47 of the pallet P, and in this state, the workpiece W to be processed next is transferred to the conveyor by an unillustrated loading/unloading device. It is carried onto the pallet P from above C. Next, insert the tool T into the machined hole WH of the workpiece W in the same manner as above, and insert the tool T into the machined hole WH of the workpiece W.
Machining of the workpiece W is started in the order of lowering, clamping the workpiece W, and rotating the spindles S1 and S2.Furthermore, at the end of machining, the rotation of the spindles S1 and S2 is stopped, the workpiece W is unclamped, and the workpiece W is rotated. Rise, workpiece W
The operation is performed in the order of extracting the tool T from the machined hole WH, and the machined workpiece W is transported.

Thereafter, by repeating this operation, the second type of workpiece W is sequentially processed. Since the tool T is thus configured to be exchanged for each pallet P, tools can be exchanged without providing a dedicated tool exchange device.

<Effects of the Invention> As detailed above, the machine tool of the present invention includes a machining unit and a jig device installed opposite to the machining unit, and this jig device includes a jig base and a jig base. A plurality of replaceable pallets are placed on the jig base so as to be able to be carried in and out, and a positioning clamp device is provided for positioning and fixing one of the various pallets to the jig base. A protruding part having a support hole that supports a plurality of tools rotatably and insertably at different pitches, a placing part provided between the protruding parts and placing a workpiece so as to be able to be carried in and taken out, and this placing part. The machining unit has a clamping device for clamping a placed workpiece, and the machining unit includes a plurality of main spindles and an inter-axis pitch that adjusts the center-to-center pitch of the plurality of main spindles to match the pitch of the tools on the pallet. Since the structure includes an adjusting device and a fastening means for moving the plurality of spindles in the direction of the spindle axis and inserting and coupling the tools on the pallet to the spindles, it is possible to machine a plurality of holes at the same time. This method has the advantage of being able to shorten machining time and also being able to accommodate changes in the pitch between the shafts due to pallet exchange. Furthermore, since tools are exchanged for each pallet, there is no need to provide a dedicated tool exchange device, resulting in a simpler configuration. Furthermore, since the tool is rotatably supported in the support hole of the pallet during machining, it is possible to machine the machining hole with high precision.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of the machine tool of the present invention, FIG. 2 is a plan view taken in the direction of the arrow in FIG. 1, and FIG. The side view and FIG. 4 are enlarged front views of the jig device. 11... Processing unit, 12... Jig device, 1
3... Fixed base, 15... Servo motor, 19...
Slide stand, 20... Servo motor, P... Pallet, S1, S2... Main shaft.

Claims (1)

[Claims] 1 A processing unit and a jig device installed opposite to the processing unit, the jig device including a jig base and a variety of replaceable pallets placed on the jig base so that they can be carried in and out. A positioning clamp device is provided for positioning and fixing one of the various types of pallets to the jig base, and the pallet is provided with a plurality of tools provided at both ends to support a plurality of tools so that they can be rotated at different pitches and inserted. a protruding part having a support hole for carrying out the processing; a placing part provided between the protruding parts on which a workpiece is placed so as to be able to be carried in and out; and a clamping device for clamping the workpiece placed on this placing part; The unit includes a plurality of spindles, an inter-spindle adjustment device that adjusts the inter-spindle pitch of the plurality of spindles to match the pitch of the tools on the pallet, and a center-spindle adjustment device that moves the plurality of spindles in the direction of the spindle axis. A machine tool characterized in that it is provided with fastening means for inserting and coupling the tools on the pallet to the main shaft, respectively.