JPS5924402Y2 - Working cylinder in automatic bar feeder of automatic lathe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an action cylinder that slidably holds a bar in order to push the bar to a fixed size in an automatic bar feeder for an automatic lathe.

As is well known, an automatic bar feeder uses a rotating chuck to clamp a workpiece such as a bar or pipe, and when the lathe cutting process is finished, the chuck releases the clamping and simultaneously releases the bar. The working barrel that is clamping the bar elastically moves forward to push the bar a fixed length into the lathe cutting section, but conventionally, when the bar pushing process is finished, the chuck re-clamps the bar and the working barrel moves forward. There was a drawback that the bar surface was scratched when returning to work.

In other words, since the bar is forcefully and elastically clamped at the tip of the vertically split sheath-like working cylinder, when the other part of the bar is held by the chuck and the working cylinder is retreated, the working cylinder is When the tip slid on the bar surface, scratches were likely to occur due to metal-to-metal contact.

For this reason, depending on the product, it may be necessary to refinish the surface of products processed through the conventional automatic bar feeder, resulting in extremely inefficient aspects.

The present invention attempts to solve the above-mentioned drawbacks by forming a resin layer made of wear-resistant hard elastic synthetic resin on the inner circumferential surface of the tip of the working cylinder, and forming a funnel-shaped resin layer to cover the rear end of the resin layer. The bar material introducing portion is formed to protrude into the working cylinder.

The structure of the working tube of the present invention will be explained according to the drawings. The working tube 1 shown in FIGS. 1 and 2 is made of metal and has a vertical groove 2 having a constant depth from the tip on the opposing cylinder wall. , 2 are formed and the tip part is formed in the shape of a vertically split sheath, and a resin layer 3 made of a wear-resistant hard elastic synthetic resin such as urethane is formed on the inner peripheral surface.
is formed to a certain thickness.

Two grooves 4, 4' are formed on the inner peripheral surface, and the resin of the resin layer 3 flows into these grooves 4, 4' to prevent the resin layer 3 from easily peeling off from the inner peripheral surface of the metal. .

Reference numeral 5 denotes a funnel-shaped rod introduction part that covers the rear end of the resin layer 3 and is integrally formed to protrude from the inner circumferential surface of the working cylinder 1.

A rod 6 is inserted into the working cylinder 1, and the inner peripheral surface of the resin layer 3 elastically clamps the outer periphery of the rod 6 due to the elasticity of the vertically split sheath-like tip.

FIG. 3 is a longitudinal cross-sectional view of the main part of the automatic bar feeder equipped with the working cylinder 1, in which the threaded part 7 at the base end of the working cylinder 1 is integrally attached to the tip of the driving cylinder 8 that moves forward and backward. has been done.

Reference numeral 9 denotes a chuck, the conical outer circumferential portion of which is slidably inscribed in the cap 10, and the cylindrical shaft portion 1 integrated with the chuck 9.
This is a well-known structure in which the bar material 6 is held by the chucks 1 moving forward and backward, and these chucks and the like are rotatably provided on the machine frame 13 via bearings 12.

When the cylinder shaft part 11 retreats and the chuck 9 is opened, the action cylinder 1 is advanced by the drive cylinder 8, and the bar 6 held at the tip is pushed forward.

Next, when the chuck 9 is closed by the advancement of the cylinder shaft part 11, the bar 6 is clamped in a state where it has been pushed forward by a certain distance, and in this state, the working cylinder 1 is retreated. This is to push the material 6 to the lathe cutting section to a fixed size.

Therefore, in the present invention, since the resin layer 3 comes into contact with the outer periphery of the rod 6 and clamps the rod elastically, it not only has the effect of preventing scratches on the surface of the rod, but also has the effect of preventing damage inside the working cylinder 1. When inserting the rod 6 between the resin layers, the funnel-shaped rod introduction part 5 formed protruding from the resin layer protects the rear end of the resin layer from being scratched and damaged by the tip of the rod 6. , resin layer 3
It has little wear and tear and can be used for a long period of time.

As explained above, the working tube of the present invention utilizes the properties of the resin to prevent the occurrence of scratches on the bar, and the funnel-shaped bar introduction part makes it easy to insert the bar between the resin layers. At the same time, since the resin layer is protected, it has practical effects such as a long life, and is extremely useful in improving the workability of automatic lathes.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an embodiment of the working tube according to the present invention, FIG. 2 is a longitudinal cross-sectional view thereof, and FIG. 3 is a longitudinal cross-sectional view of a main part of an automatic bar feeder. 1... Working cylinder, 2, 2... Vertical groove, 3
...Resin layer, 5...Bar introduction part, 6.
... Bar material, 9 ... Chuck.

Claims (1)

[Scope of utility model registration request] A bar is clamped elastically at the tip of a vertically split sheath-like working cylinder so that it can slide in the axial direction, and the bar is intermittently clamped by a chuck as the working cylinder moves forward and backward. In the automatic lathe bar feeder that pushes bar material to the cutting part of the lathe to a fixed size,
A resin layer made of wear-resistant hard elastic synthetic resin is formed on the inner circumferential surface of the tip of the working cylinder, and a funnel-shaped bar introduction part that covers the rear end of the resin layer is formed to protrude into the working cylinder. An action cylinder characterized by: