JPH0546839Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is based on a transfer machine in which a workpiece is sequentially transported to a plurality of processing stations by a transport device, and the workpiece is processed at each processing station. Regarding the clamp mechanism.

(Prior Art) Transfer machines disclosed in Japanese Utility Model Publication No. 60-24528 and the like have been used to efficiently perform various types of processing on workpieces. This transfer machine sequentially sends the workpiece to each processing station using a transport device, and performs the specified processing at each processing station. However, if the workpiece is directly clamped by a jig device, it will be easier to change the model. Therefore, if the shape of the workpiece changes, another clamping device must be prepared, making the device extremely large and complicated.

Therefore, some transfer machines have conventionally been simplified by creating pallets according to the type of workpiece, mounting the workpieces on the pallets, and transporting and handing over the whole pallet.

(Problems to be Solved by the Invention) Some processing operations performed by transfer machines apply vibrations and large forces to the workpiece, such as milling operations. Therefore, when attaching a workpiece to a pallet, it is necessary to have a strong clamping device to fix the workpiece to the pallet or a natural clamping device to absorb chatter vibrations, and for this reason, in the past, the pallet itself was complicated. In addition, machining at other machining stations may be obstructed by the increased size and clamping devices provided on the pallet.

(Means for Solving the Problems) In order to solve the above problems, the present invention involves transporting a workpiece attached to a pallet between a plurality of machining stations, and using a clamp device at the machining station to palletize the workpiece. In a transfer machine that is positioned and fixed to a jig base and performs a predetermined processing on the workpiece, the jig base supports a cylinder that moves in and out of the workpiece from the lateral direction and the vicinity of the processing part of the workpiece. The present invention is characterized in that a clamping device constituted by a member is provided, and when machining in which a large force is applied to the workpiece, the clamping device is placed in a clamped state to support the vicinity of the machining portion of the workpiece.

(Function) Since a clamping device is installed on a predetermined jig base of each processing station, the pallet is equipped with the minimum necessary clamping device, that is, a clamping device that does not interfere with processing tools at other processing stations. That's enough.

(Example) An example of the present invention will be described below based on the accompanying drawings.

Figure 1 is a plan view of a processing station to which the clamp mechanism according to the present invention is applied, and Figure 2 is A of Figure 1.
-A direction arrow view, and shows a station for milling as an example.

A processing station is provided with a jig base 1, a disc-shaped index table 2 is provided at the center of the jig base 1, and rails 3, 3 are disposed to sandwich the index table 2. A groove 5 is formed in the rail 3, into which a vertically oriented pallet 4 is slidably inserted, and a similar groove 6 is formed in the index table 2 at an eccentric position.

Further, a gate-shaped support 7 is erected on the jig base 1, and clamp devices 8, 8 are attached to this support 7. A second clamp device 8 is provided at the tip of the rod of the first cylinder unit 9, in which the piston rod moves in and out in the lateral direction (horizontal direction in Fig. 1), to accommodate changes in models in which the piston rod moves in and out of the front and back directions.
Attach the cylinder unit 10, attach the back-up plate 11 to the tip of the piston rod of the second cylinder unit 10 as shown in FIG.
A clamp rubber 12 is fixed to this backup plate 11 with screws or the like.

In the above, the cylinder head W as the workpiece
To mill the mounting surface for the cylinder block, the cylinder head W is positioned and mounted on one surface of the pallet 4 via the reference seat 4a using a clamping device (not shown), and the pallet 4 is indexed via the rail 3. Transport it to the top of table 2. At this time, the index table 2 is rotated 180 degrees from the state shown in FIG. 1, that is, the groove 5 of the rail 3 and the groove 6 of the index table 2 are aligned. Therefore, the pallet 4 conveyed along the rail 3 enters the groove 6 of the index table 2 as it is, and is positioned and fixed by a clamp device (not shown).

Next, the index table 2 is rotated 180 degrees to the state shown in FIG. ), and the mounting surface of the cylinder head W is cut by a milling cutter 14 rotated by a spindle device 13.

Thereafter, the gripping state by the clamping device 8 is released, the index table 2 is rotated 180 degrees again, and the pallet 4 is transported to another processing station by the rail 3 with the cylinder head W attached thereto.

(Effects of the invention) As explained above, the invention provides the following effects.

A jig base is provided at the processing station of the transfer machine, and a workpiece clamping device is provided on this jig base, which simplifies the structure of the pallet on which the workpiece is attached and prevents interference between the processing tool and the clamping device at the processing station. This improves machining efficiency when machining from multiple directions.The workpiece can be firmly held with a specified strength during machining, so it prevents distortion of the workpiece during milling and at the same time prevents chatter. I can do it.

The life of machining tools is extended, and products with excellent machining accuracy can be obtained.

The pallet that holds the workpiece has been reduced to the minimum form required, except for special processing at each station (here, for milling that requires the workpiece to be held firmly), so the pallet body, workpiece clamp The manufacturing cost and weight of the device can be reduced.

When there are many processing stations and workpieces are transferred at each station, the workpieces are not positioned by directly pressing them against the jig, so there is no risk of damage to the reference hole and poor positioning.

[Brief explanation of the drawing]

Figure 1 is a plan view of a processing station to which the clamping mechanism according to the present invention is applied, and Figure 2 is A of Figure 1.
- A direction arrow view, FIG. 3 is an enlarged view of the main part of FIG. 1. In the drawings, 1 is a jig base, 2 is an index table, 4 is a pallet, 7 is a support, 8 is a clamp device, and W is a workpiece.

Claims (1)

[Scope of utility model registration request] A workpiece attached to a pallet is transported between a plurality of processing stations, and at the processing station, a clamp device positions and fixes the workpiece to a jig base via the pallet, and a predetermined processing is performed on the workpiece. In such a transfer machine, a clamp device is provided on the jig base and includes a cylinder that moves in and out of the workpiece in a lateral direction, and a member that supports the workpiece in the vicinity of the machining part, and the clamping device is configured to apply a large force to the workpiece. 1. A clamping mechanism for a workpiece in a transfer machine, wherein the clamping device is placed in a clamping state to support the vicinity of a processing portion of the workpiece when performing processing in which the workpiece is machined.