JPH0357363Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a bar feeder device for a lathe that eliminates material waste.

Prior Art In a bar feeder device in which a feed finger is provided at the front end of a feed pipe and feeding is performed by moving the feed pipe, the product length is equal to the gripping width _l1 , which is the sum of the widths of the gripping claws of the finger chuck 30 and the gripping claws of the spindle chuck, as shown in Figure 3. A residual material L is created by adding the missing front end _l2 . As a measure to keep this residual material to a minimum, a push rod with a diameter smaller than the outside diameter of the bar material is provided at the front end of the feed pipe to feed the bar material into the gripping claws of the chuck. For example, Jitsukaiaki
As is known from No. 59-1502, an extrusion rod is rotatably fixed to the tip of the feed pipe, a fixing ring is fixed in the middle of the feed pipe, and a spring receiver ring is rotatably provided around the outer circumference of the fixing ring. A bar support ring is fixed to the other end of the spring, which is fixed at one end, and is supported so as to be slidable in the axial direction on the outer periphery of the push rod. Some bar material support rings grip the bar material and move within the spindle hole, and after coming into contact with the claws of the main shaft chuck, the spring is compressed so that the push rod moves forward and pushes out the bar material.

Problems that the invention aims to solve When a push rod is installed at the front end of the feed pipe as a means to keep the amount of residual material to a minimum, the rear end of the bar material cannot be gripped, so when the bar material is relatively long, it will not be able to hold the bar material due to the influence of centrifugal force. The rotation must be set modestly, as whirling may occur and accuracy may deteriorate, leading to a dangerous situation. This drawback is due to the fact that
Although this method was solved in No. 1502, the part rotated by the rotation of the bar material is a support ring,
Since there are a large number of push rods, springs, and spring receiving rings, and their mass is large, the bar material rubs around the grip hole of the support ring, causing damage to the grip hole. Additionally, there is a possibility that whirling may occur due to unbalanced springs, making it generally difficult to achieve high speed rotation.

Means for Solving the Problems In a lathe equipped with a bar feeder 1 and a power chuck 20, a pusher feeder frame 5 screwed onto the front end of the feed pipe 3 of the bar feeder 1;
A spring 11 is installed in the center hole of the pusher feeder frame 5.
a pusher 9 which is biased in the projecting direction and movably inserted, a pusher ball 10 provided at the front end of the pusher 9, and a pusher ball 10 provided at the center of the pusher feeder frame 5 to restrict the movement of the pusher 9. a ball spring clamper 16, a chuck joint 6 rotatably provided at the front of the pusher feeder frame 5, and a chuck joint 6 that is replaceably screwed onto the front end of the chuck joint 6 for gripping the bar material 8. a finger chuck 7 having a gripping hole with a taper hole at the mouth; and a guide bush 21 provided at the front of the power chuck 20 hole of the lathe and having a tapered part for opening a tapered hole at the mouth of the finger chuck 7 on the outer diameter of the rear end; The pusher 9 whose movement is prevented by the bar material 8 held by the finger chuck 7 and the ball spring clamper 16 is the bar material 8.
When the gripping hole of the finger chuck 7 is opened by the guide bush 21, the pusher 9 is projected by the spring 11 and the bar material 8 is pushed out.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In a known bar feeder 1, a bar feeder main body 2 is provided on the floor behind the main shaft of the NC lathe, and a feed pipe 3, which is moved by a feed motor fixed to the bar feeder 2, is provided concentrically with the main shaft 4. A pusher feeder frame 5 is tightly screwed onto the front end of the feed pipe 3.
Small diameter portion 5a at the outer diameter front end of the pusher feeder frame 5
A chuck joint 6 is rotatably provided through a bearing. This chuck joint 6
A finger chuck 7 is tightly screwed onto the front end of the holder. The finger chuck 7 has a central hole 7a penetrating through it from the front end, and the front half of the through hole is used as a gripping claw for the bar material 8, and the inner diameter is slightly smaller than the outer diameter of the bar material, and a tapered hole is provided at the mouth for gripping. 7b is drilled. A through hole 7c is provided at the back of the gripping hole 7a, and several holes 7d are equally spaced in the axial center of the through hole 7c, perpendicular to the axial direction from the outer periphery. A slot 7e reaching the hole 7d is provided in the axial direction, and the gripping hole 7a is divided into several equal parts so that the outer diameter of the rear end of the bar material 8 is pushed in and gripped by a spring action. There is. A stepped center hole is bored in the pusher feeder frame 5, with a large diameter hole 5c in the center and a small diameter hole 5b at the front end.
An air hole is provided in the rear wall, and a pusher 9 is inserted through this stepped center hole. The pusher 9 has a flange 9a in the center, and a push ball 10 in the center of the front end surface.
A spring 11 is provided, the tip of which passes through the small diameter hole 5b, and is interposed between the rear end surface of the collar and the rear wall of the large diameter hole 5c.
is biased so as to protrude into the grip hole 7a of the finger chuck 7. Further, an R groove 9b is provided at the center of the outer diameter of the flange 9a of the pusher 9, and when the pusher 9 is pushed in and the rear end becomes a stopper and comes into contact with the rear wall, the outer periphery of the pusher feeder frame 5 corresponds to the R groove 9b. The ball 14 is inserted into the hole 5d drilled more perpendicularly in the axial direction, is pushed by the spring 15 and comes into contact with the R groove 9b, and the ball spring clamper 16
It is said that The condition that the pusher 9 is located at the rear end of the pusher feeder frame is that the ball spring clamper 1
This is when both the frictional resistance of the ball 14 of No. 6 in contact with the R groove 9b of the pusher 9 and the frictional resistance of the gripping portion of the bar material 8 gripped by the finger chuck 7 are added, and the claw of the finger chuck is opened. When the frictional resistance between the gripping hole and the bar material decreases, spring 1
The pusher 9 is pushed out with a force of 1 to feed the bar material. Ball spring is clamper 1
The ball 14 of No. 6 does not fly away even if the R groove 9b is not located at the bottom because the outlet of the hole 5d is formed to have a smaller diameter than the ball diameter.

A guide bush 21 that is fitted into a hole in a power chuck 20 that is fitted to the front end of the main spindle 4 of an NC lathe.
has a center hole that serves as a guide for the bar material 8, a taper 21a for opening a taper hole at the mouth of the finger chuck is cut at the rear end of the outside diameter, and a mounting collar portion 21 at the front end.
b is provided. The mounting flange 21b is formed into a flat plate that extends radially evenly around the circumference and fits between the claws 22 of the chuck 20 so as not to interfere with the movement of the claws 22 of the chuck 20, and is fixed to the front surface of the chuck. Further, a sizing stopper 26 is detachably fixed to the tool mounting surface of the tool post turret 25 in the direction of the spindle axis.

Operation Now, the power chuck 2 is attached to the front end of the main spindle 4 of the NC lathe.
0 is fitted, and the front end of the bar 8 is held by the chuck 20, and the rear end of the bar 8 is held by the finger chuck 7 of the bar feeder 1 installed on the rear floor of the NC lathe. Further, a plurality of cutting tools and a sizing stopper 26 are fixed to the tool mounting surface of the tool post turret of the NC lathe. The main shaft 4 is rotated by a main shaft motor (not shown) in response to a command from the NC device, the bar material 8 held by the power chuck 20 is rotated, and the tool post turret 25 is moved in the X-axis direction and the Z-axis direction by a command from the NC lathe. And the tool post turret 25
Turning is performed using a cutting tool fixed to the tool mounting surface, and the workpiece is cut off using a parting tool. The tool rest turret 25 rotates in response to a command from the NC device, and a sizing stopper 26 is indexed to the front of the spindle, positioned at a predetermined position determined according to the length of the workpiece, and stopped.

When the claw 22 of the power chuck is opened by an NC command, the bar material 8 is pushed forward by the feed pipe 3 of the bar feeder 1 via the pusher feeder frame 5, chuck joint 6, and finger chuck 7, and the front end surface of the chuck is pushed out. When it comes into contact with the sizing stopper 26, a sensor (not shown) of the bar feeder 1 is activated, and the movement of the feed pipe 3 is stopped by a command from the NC device. Next, the pawl 22 of the power chuck 20 is closed in response to a command from the NC device, the main shaft is rotated, and turning is started again. In this way, when the turning process is performed one after another and the bar material 8 becomes shorter, the bar material 8
The finger chuck 7, which is held at its rear end and is pushed by the feed pipe 3 and moved toward the chuck within the main shaft 4 hole, is pressed against a guide bush 21 provided at the front end of the power chuck hole. At this time, the taper 21a at the rear end of the guide bush 21 and the taper 7b at the front end of the finger chuck 7 are pressed together, and the gripping hole 7a
is opened and the claw 22 of the power chuck is also opened as described above, so the bar material 8 is released and becomes free. Up until now, the pusher feeder frame hole 5 has come into contact with the rear end of the bar material 8 held by the finger chuck.
The pusher 9 located at the rear inside the spring 11 pushes up the ball 14 of the ball spring clamper 16 and moves forward to push out the bar material 8.
The front end of the extruded bar material 8 is the sizing stopper 26
The pusher 9 stops moving, the claw 22 of the power chuck 20 is closed in response to a command from the NC, and the bar 8 is subsequently rotated. Since the pusher 9 is in contact with the rear end of the bar 8 via the push ball provided at the front end, there is no problem even if the bar is rotated at high speed. In this way, the pusher 9 pushes out the bar material by the force of the spring 11, and when the front wall of the collar 9a comes into contact with the front wall of the hole 5c, the front end of the bar material 8 is pushed out by the fixed size stopper 26.
When the workpiece is no longer hit, a signal is sent to the NC device by the sensor provided on the stopper 26, the operation of the NC device is stopped, and the scraps that are insufficient for the length of the workpiece are removed from the front part of the chuck. The feed pipe 3 of the bar feeder 1 is returned to the retreat end by rotating the feed motor in response to a command from the NC, and a new bar material 8 is supplied to the front part of the finger chuck 7 by the material loading/unloading device (not shown) of the bar feeder 1, and then the feed pipe 3 is returned to the retreating end by the feed motor (not shown) of the bar feeder 1. The movement of the bar material 8 in the axial direction is prevented by
As the feed pipe 3 moves forward, the pusher 9 protruding forward from the finger chuck gripping hole 7a is pushed back by the bar material 8, and the outer diameter of the bar material 8 reaches the gripping hole 7.
a, the rear end of the pusher 9 hits the rear wall of the hole 5c, and the feed pipe 3 stops. In this position, the pusher 9 is gripped by the ball spring clamp 16 and the finger chuck 7 and is prevented from moving in the axial direction by the material. Subsequently, the material loading/unloading device releases the bar material 8, the feed pipe moves, and a new bar material 8 is fed into the spindle, gripped by the power chuck 20, and cutting is resumed.

Effects As detailed above, in this invention, a non-rotating spring-type pusher feeder is provided at the front end of the feed pipe, and a finger chuck is rotatably attached in front of the feeder. It operates as a well-known feed finger system that rotates and feeds the bar material, and when the bar material becomes short and the finger chuck can no longer move forward, it uses a spring-type pusher feeder to push out the remaining material and continue continuous processing. By reducing the length of the remaining bar material as much as possible to make it as close as possible to a non-residue material, it is possible to use the material effectively.A push ball is provided at the tip of the pusher, so you can rest assured even if the bar material becomes short. It has the effect of continuing high-speed rotation.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the bar feeder device of the present invention, FIG. 2 is an overall view, and FIG. 3 is an explanatory diagram of the amount of remaining material in the conventional feed finger system. 1... Bar feeder, 3... Feed pipe,
5...Push feeder frame, 6...Chuck joint, 7...Finger chuck, 9...Pusher, 10...Push ball, 11...Spring, 16
... Ball spring clamp, 20 ... Power chuck, 21 ... Guide bush.

Claims (1)

[Scope of utility model registration request] In a lathe equipped with a bar feeder and a power chuck, a pusher feeder frame is screwed onto the front end of the feed pipe of the bar feeder, and a pusher is movably inserted into the center hole of the pusher feeder frame and is biased in a projecting direction by a spring. and,
A push ball provided at the front end of the pusher, a ball spring clamper provided at the center of the pusher feeder frame to restrict movement of the pusher, and a chuck joint rotatably provided at the front of the pusher feeder frame. , a finger chuck that is replaceably screwed onto the front end of the chuck joint and has a gripping hole with a tapered mouth hole for gripping the bar material; It includes a guide bushing having a tapered part that opens a taper hole at the mouth of the finger chuck, and a pusher whose movement is prevented by a bar material held by the finger chuck and a ball spring clamper.When the bar material becomes short, the gripping hole is opened by the guide pusher A no-residue bar feeder device characterized in that when opened, a pusher protrudes by a spring and pushes out bar material.