JPS6328740B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for positioning and fixing a workpiece exchange pallet on a table of a machine tool.

As the above-mentioned device, the inventor considered the device shown in FIG. 5 prior to the present invention. That is, an auxiliary table 40 is mounted on the table 1 of the machine tool, and a pallet support base 41, a guide rail 42, a traveling rail 43, and a stopper 4 are mounted on this auxiliary table 40.
4. A pair of positioning plugs 45 that can be moved up and down;
The pallet 2 is equipped with a clamp mechanism 46, etc., and on the bottom surface of the pallet 2, on which workpieces are properly set and fixed on the upper surface by the clamp mechanism, there is a T-shaped groove 47 that engages with the guide rail 42 and the clamp arm 46a of the clamp mechanism 46, and a running rail. A square groove 48 with a spring support wheel acting on the pallet 43 and a plug hole 49 corresponding to the plug 45 were provided, and the pallet 2 was guided from the front of the auxiliary table 40 via the guide rail 42 and the square groove 48. This structure is such that the pallet 2 is fixed on the auxiliary table 40 by positioning the pallet 2 on a plane using the dowel-type positioning means 45 and 49, and then pulling down the clamp arm 46a that engages the T-shaped groove 47.

However, this conventional device requires an auxiliary table to fix the pallet on the table of the machine tool, and also has a T-shaped groove on the bottom of the pallet itself, a square groove with a running mechanism inside, and a high-precision machine. The structure was complicated and expensive, as it required machining of plug holes, etc.

This invention simplifies the structure by allowing workpiece exchange pallets to be fixed directly to the table of a machine tool without using an auxiliary table, and also uses a planar contact type positioning method instead of a joint positioning method. It is an object of the present invention to provide a pallet positioning and fixing device that eliminates special processing for positioning and clamping pallets by adopting a clamping method, thereby making the pallet structure simple and inexpensive. purpose.

Embodiments of the present invention will be described below based on the drawings.

As shown in Figures 1 and 2, cutting, grinding,
At the front of a left-right drive table 1 of a machine tool M that performs metal processing or other metal processing, a pallet carrier 3 capable of carrying two workpiece exchange pallets 2, 2 in parallel on the left and right is installed along rails 4, 4. In addition to being installed so as to be able to reciprocate from side to side, a relay table 5 is fixedly installed between the table 1 and the carrier 3, and a large number of workpieces are placed on the pallet 2 on the carrier 3 using appropriate clamping means (not shown). ) to fix the set,
This pallet 2 is carried onto the table 1 via the transfer table 5, fixed with a positioning and fixing device to be described later, and machined.Then, the processed pallet 2 is carried forward from the table 1 and placed on the transport cart 3. At the same time, a new pallet 2 is brought in and set in the same manner.

The two pallet mounting sections 3A and 3B formed on the left and right sides of the conveyance cart 3 are provided with a pair of left and right roller conveyance mechanisms 6, 6 and pallet guides 7, and the relay table 5 is also provided with a similar roller conveyance mechanism. 8, 8 and pallet guides 9, 9 are provided, and a pair of left and right roller transport mechanisms 10, 10 that can be raised and lowered are installed on the table 1, and the pallet 2 is transported through these roller transport mechanisms 6, 8, 10. It is configured so that it can be easily rolled and transferred between the carrier vehicle 3 and the table 1.

Numerous T-shaped grooves 1 formed on the top surface of the table 1
1... are fitted with various members constituting a positioning and fixing device.

That is, at the back of the table 1, there are a pair of left and right positioning support members 12 for receiving the back side 2a of the pallet 2, and on the left side of the table 1, there are front and rear positioning support members 12 for receiving the left side 2b of the pallet 2. A pair of support members 13, 13 are each fixed. These supporting members 12, 13 are comprised of base blocks 12a, 13a and bolts 18, 19, which are fixed to the T-shaped groove 11 via bolts 14, 15 and nut blocks 16, 17, as shown in FIGS. Consisting of stoppers 12b and 13b that can be adjusted slightly in and out in a taper cam type by tightening adjustment, and base blocks 12a and 13a.
The top surface of the tip is configured as a mounting surface 20, 21 that receives the pallet 2 at a constant level.

Further, on the right side of the table 1, there is a pair of front and rear clamp mechanisms 2 that act on the right side 2c of the pallet 2.
2 and 22 are further placed in front of table 1 with pallet 2.
A pair of left and right clamp mechanisms 23, 23, which act on the front side 2d, are respectively provided.

As shown in FIG. 3, the side clamp mechanism 22 includes a pusher 22 which is hydraulically protruded and retracted by a cylinder body 22a which is fixed to the T-shaped groove 11 using a bolt 24 and a nut block 25.
The pallet mounting surfaces 20, 2 of the support members 12, 13 are disposed at the tip of the body 22a.
A pallet mounting surface 26 is formed at the same level as 1.

The front clamp mechanism 23 also includes a base block 23a fixed to the T-shaped groove 11 via a bolt 27 and a nut block 28, and a base block 23a fixed to the T-shaped groove 11 via a bolt 27 and a nut block 28.
It consists of a cylinder body 23b that is slidable along left and right T-shaped grooves 29 formed on the upper surface of a, and a pusher 23c of a hydraulic protrusion drive and spring retraction type built into the cylinder body 23b, and a base block 23a.
The upper surface of each of the pallet mounting surfaces 20, 21, 26
The pallet mounting surface 30 is formed at the same level as the pallet mounting surface 30. Each block body 23b is configured to be able to slide to a retirement position laterally outward from the front-rear movement locus of the pallet 2, thereby allowing the pallet 2 to be carried in and out of the table 1.

Further, in the center of the table 1, each of the above-mentioned mounting surfaces 2 are provided.
Level blocks 31 and 31 on the same level as 0, 21, 26, and 30 are fixed using bolts and nut blocks.

The contact position fine adjustment means of the back positioning support member 12 and the side positioning support member 13 for positioning the back side 2a and the side side 2b of the pallet 2 in contact with each other has the structure using the taper cam shown in the embodiment. Besides,
Any form may be used, and simply a stopper bolt may be used to directly contact and support the sides of the pallet. Further, the specific configurations of the side clamp mechanism 22 and the front clamp mechanism 23 can be freely selected.
Positioning support members 13 and 12 that support and oppose each other
It is sufficient if the pressure clamp can be applied to the side, and the pallet 2
It would be ideal if it could be pressed downward.

Moreover, in order to slide and move the front clamp mechanism 23 laterally, human power, a fluid pressure cylinder, an electric motor,
A mechanical drive mechanism such as a chain or the like may be arbitrarily selected as required.

Since the present invention is configured as described above, it exhibits the following effects.

(b) Since an auxiliary table is not used as in the past,
It is structurally simple and can be implemented at low cost.

(b) After the two adjacent sides of the pallet are abutted and supported by the inner positioning support member and the side positioning support member, the other two sides of the pallet are positioned and supported by the side clamp mechanism and the front clamp mechanism. Since the pallet is configured to be press-clamped to a member, there is no need to specially form plug holes or clamping grooves in the pallet itself, and the pallet can be constructed with a simple structure and at low cost.

(c) Since the front clamp mechanism can be slid to the side and retracted, pallets can be easily and quickly loaded and unloaded from the front of the table using the loading/unloading mechanism. The front clamp mechanism, which has been slid back to the front, can be easily clamped, making it possible to firmly and securely set the pallet on the table with accurate positioning, reducing workpiece change time. This is effective in improving work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of the whole, Fig. 2 is a plan view of the whole, Fig. 3 is a longitudinal sectional front view of the main part, and Fig. 4 is a partially cutaway side view of the main part. FIG. 5 is a perspective view of a conventional device. 1...Table, 2...Pallet for work replacement, 2a...Back side of pallet, 2b/2c...
Side side of the pallet, 2d...front side of the pallet,
10... Conveyance mechanism, 12... Back positioning support member, 13... Side positioning support member, 22... Side clamp mechanism, 23... Front clamp mechanism.

Claims (1)

[Claims] 1. A pallet transport mechanism 10 for loading and unloading a pallet 2 for workpiece exchange in the front and back horizontal directions on a table 1 of a machine tool, and a pallet transport mechanism 10 for placing and supporting the loaded pallet 2 at a certain level on the table. At the same time, the back positioning support member 12 and the side positioning support member 13, which position and abut and support the back side 2a and one side side 2b of the pallet, place and support the pallet 2 at the above-mentioned constant level on the table, and A side clamping mechanism 22 and a front clamping mechanism 23 are attached to press and clamp the other side side 2c and front side 2d of 2 toward the opposing side positioning support member 12 and inner positioning support member 13, respectively. and the front clamping mechanism 23 is configured to be slidable between a predetermined clamping position and a retracted position located laterally outward of the pallet loading/unloading trajectory. Positioning fixing device. 2. The apparatus according to claim 1, which is configured to allow fine adjustment of the pallet contact and support positions of the inner positioning support member 12 and the side positioning support member 13. 3. In the device described in claim 1 or 2, the side clamp mechanism and the front clamp mechanism are configured to press the side surface of the pallet with a pusher that is driven and moved diagonally downward by fluid pressure. thing.