JP2005230980A - Clamping device using tapered eccentric shaft and tapered pilot shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve machining efficiency by easily fixing a workpiece which is a metal casting such as a die casting hard to clamp, and to reduce a material cost and machining man-hours by dispensing with a waste boss or the like for clamping. <P>SOLUTION: In the case of clamping the workpiece which is the metal casting such as the die casting hard to clamp, by an eccentric shaft using a hole as cast, either one or both of the tip of the eccentric shaft and the tip of the fixing side pilot shaft are tapered, and a taper angle at this time is made an obtuse angle more than a cast angle of the workpiece. Clamping force of further positively pressing the metal casting to a clamping tool thereby works to improve such a defect that the metal casting comes off or lifts from the clamping tool during machining. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention provides a taper to the tip of the eccentric shaft and the pilot shaft to clamp the workpiece so as to securely fix the workpiece that is difficult to clamp with a metal casting product such as die-casting using a cast hole. Regarding the method.

Conventionally, a clamp mechanism using an eccentric shaft has been generally used.

Conventionally, metal castings such as die-casting are made of aluminum or zinc, so that positioning clamps using magnetism cannot be performed, so that it has been very difficult to clamp them during processing. Even if clamping is performed using the eccentric shaft of the clamp jig using the cast hole of the metal casting, the workpiece will come off or float due to the draft of the metal casting. A malfunction occurred.

When clamping a workpiece that is difficult to clamp with a die cast or other metal casting with an eccentric shaft using a cast hole, taper the tip of the eccentric shaft and / or the tip of the fixed pilot shaft. Therefore, stable clamping is achieved.

When clamping a workpiece that is difficult to clamp with a metal casting such as die cast with an eccentric shaft using a cast hole, taper the tip of the eccentric shaft and / or the tip of the fixed pilot shaft. By clamping the taper angle at this time with an obtuse angle than the casting angle of the workpiece, the clamping force that presses the metal casting product to the clamp jig more reliably works. It was possible to improve problems such as falling off and floating.

Workpieces that are difficult to clamp with metal castings such as die casts can be fixed easily and the processing efficiency can be improved. Also, the disposal bosses for clamping are not required, reducing material costs and man-hours. Can contribute.

When milling workpieces that are difficult to clamp with metal castings such as die-casting, this mechanism is implemented by using a punched hole such as a blanket.
As shown in Fig. 1, the pilot shaft and the eccentric shaft are fixed using two cast holes of the workpiece.

It is a perspective view which shows the clamp apparatus relationship using a workpiece, a taper eccentric shaft, and a taper pilot shaft in an Example.

Explanation of symbols

1Die-cast workpiece such as die cast 2Casting hole 3 such as blanking 3Axis tip of the fixed pilot shaft with a tapered tip 4Eccentric shaft with a tapered tip

Claims (2)

In the clamping mechanism with an eccentric shaft for machining a metal workpiece, the clamping device is characterized in that either or both of the tip of the eccentric shaft and the tip of the fixed pilot shaft are tapered. 2. The clamping device according to claim 1, wherein a taper at the tip of the eccentric shaft and / or the tip of the fixed pilot shaft is made larger than a casting angle of a metal casting having a cast hole.

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