JPS5981018A - Automatic tapping machine - Google Patents

Abstract

PURPOSE:To both advance a part material to be always brought in close contact with a part-pushing rod and eliminate biting of cutting chips further improve circulative cooling of cutting oil so as to accurately tap the part material, by tilting a tapping shaft and tapping the part material on a sloped face. CONSTITUTION:A part-pushing rod 18 advances, fitting a part material M into a guide 13 to be engaged to a tap 10, and the material M is tapped by the tap 10. When tapping work is finished, a stopper piece 30 is placed between parts P, fitted and accumulated on a tapping shaft 9. Simultaneously with the above action, the pushing rod 18 starts to move backward. After the pushing rod 18 is released from the tap 10, a tap pushing rod 20 starts to move backward, and the guide 13 advances, while the tapping shaft 9 is detached from a chuck 6. Then the part P blocked by the stopper piece 30 is dropped down from the rear end of the tapping shaft 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic screw tapping machine that automatically and continuously manufactures nuts and other internally threaded parts that are widely used in transportation equipment, building construction members, electrical equipment, household goods, and other industrial fields. It is something.

An automatic screw tapping machine that feeds component materials one by one from a hopper to a guide that is movable in the lengthwise direction and cannot rotate, is pressed by a push rod against a tap inserted into the guide, and is tapped by rotating the tap. is well known. This known automatic screw tapping machine is disclosed in 5, for example, Japanese Patent Publication No. 45-31244, which was invented by the inventor of the present application,
As disclosed in Publication No. 5-13760 and Japanese Utility Model Publication No. 46-3]900.

The rear end of the tap shaft is bent at a right angle to bend the rotating body.
By driving this rotating body, the tap is rotated, and the tapped parts are sequentially moved to the rear of the housing fitted on the tap shaft, and the parts are moved in the direction along the curved part. The liquid is now discharged through the opening of the curved groove. Therefore, since the 9-rotator supports the curved part of the tap shaft internally, it is unavoidable to increase its size, and since it has a curved groove, the load is uneven, and when it rotates at *ivT+ speed, it will vibrate. Not only can you not accurately tap the screw, but you also have to worry about breaking the tap, making it impossible to increase efficiency. Also, one part is ejected through a curved part.

Although parts as long as a regular hexagonal nut can be ejected without any problem, it is not possible to handle long parts.

The present invention was invented with the aim of solving these problems and providing an automatic screw threading machine that can form internal threads on parts of various shapes and sizes accurately and at a fast speed. be.

In order to achieve this object, the automatic screw tapping machine of the present invention includes a linear tap shaft having a tap at the tip, and a component arranged around the tap shaft so as to be movable in the longitudinal direction but not rotatable. a guide, a component push rod of the hollow Q disposed ξ facing the tap shaft, a tap push rod inserted into the hollow part thereof, and a chuck driven by a prime mover to engage and disengage the rear end of the tap shaft. and a hopper disposed in front of the tap to supply component materials, the tag shaft, the guide, the component push rod and the tap push rod are each movable in the length direction, and the tap shaft is moved when the tap push rod moves forward. The tag push rod is characterized in that it is configured such that when it moves backward and engages with the chuck, when the tag push rod moves back, it moves forward and separates from the chuck.

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 shows a schematic diagram of a machine, in which a frame 2 is provided on a cutting oil 1 and receives a pressed part. A container 3 and a container 4 for receiving cutting waste are mounted. The frame body 2 includes a prime mover 5 consisting of an electric motor and a chuck 6 for controlling its rotation.
A belt-type transmission device 7 equipped with a variable speed pulley that also serves as a transmission is built-in.

Also, a bed 8 is located above the container 3.4 and is fixed obliquely. The chuck 6 is located at the high end of the inclined bed 8 and is directed diagonally downward at the same inclination angle as the bed 8.

A linear tap shaft 9 is arranged above the center of the bed 8 on an axis having the same inclination angle as the inclination angle of the bed 8, and guide shafts 11 are fixed to the bed 8 on both sides thereof and arranged in parallel. A guide 13 is mounted around the tap shaft 9 on a guide stand 12 that is slidably installed on these two guide shafts 11.
is fixed. In addition, an auxiliary guide] 4 is fixedly installed at the lower end of the bed 8, and a hopper 15 is attached to the four end surfaces of the auxiliary guide.
The lower end of chute]6 is connected to C. Guide 13.
The auxiliary guide 14 and the chute 6 are each made up of two 115 pieces facing each other, and can be replaced or the interval between the 7115 pieces can be changed depending on the size and shape of one part. 1.
5, and in the illustrated embodiment each guide 13 consists of a pair of opposing pieces. The i+i support guides are formed so as to fit almost tightly together.

The parts material being fed into the hopper 15 is the driving force fJJ41.
7 into the chute] 6 and reach the end surface of the auxiliary guide 14 in a predetermined posture, and the hopper 15
Any suitable known material can be used.

In front of the tap lO at the tip of the tap shaft 9.

A tap push rod 2o is positioned on the same central axis as the tap shaft 9 and is inserted almost densely into a hollow component push rod 18 and its hollow portion 19, and the component push rod 8 has a cedar-shaped end that is the same as that of the hexagonal nut. 14 almost tightly.

Guide stand 12. The component push rod 18 and the tap push rod 20 each have a prime mover 21 consisting of a pneumatic cylinder.
22. 23 degrees Celsius in the length direction 4M i'jh
The cylinder tubes 21a and 22 are mounted on each other.
Piston rod 21b protrudes from a+23m.

22b and 23b are connected.

In the illustrated example, the tap shaft 9 is inclined, so a means is provided to prevent the tap shaft 9 and the parts that have been tapped from slipping off.

The slip-off prevention device 27 of the tap shaft 9 is formed by being surrounded by the guide 13 by the tensile force of the spring 25 and jammed freely by the pin 24 at the low-force end of the guide 13. Claw piece 26 projected into sliding groove 28
When the tap push rod 20 retreats and the tap shaft 9 slides down due to low force, the claw piece 26 hits the tip surface of the lubricant lO. jS is pushed out from the moving groove 2B. The one-component slip-off prevention device 34 is composed of a holding arm 32 that is supported so that the rear end of the tap shaft 9 can be supported, and a prime mover 33 that is a fluid pressure cylinder. 32, the stopper piece 30 is pressed and retracted from the piece 29, and the parts fitted on the tap shaft 9 are plowed so that they do not move due to low force.

a prime mover 21,22 consisting of a hydraulic cylinder of said base;
23.33 is the cam height 35m of the cam 35.36, 37.38 rotated by the prime mover 5 for driving the tap, 3
It is driven by pressurized air supplied through a switching valve operated by limit switches 39, 40, 41, and 42 that are turned on when they come in contact with 6a, 37m, and 38a. Cam 35.3
The phase relationship of 6.37.38 is shown in FIG.

At the beginning of the operation, the parts push rod 18. The tap push rod 20 retreats,
The tap shaft 9 advances to the position where it hits the claw piece 26 and is separated from the °C chuck 6. At the same time, the guide 13 also advances and is almost in contact with the tip of the chute 6, between the one-component push rod 18 and the guide 13. The component element IM at the bottom end of the chute 16 is placed at (FIG. 8). First, the tap pusher n20 moves forward, presses and retreats the tag shaft 9, and engages the rear end with the chuck 6, simultaneously retracting the stopper piece 30 of the holding arm 32 (
Figure 9). Second, the nine component push rod 18 moves forward and the component material M
into the guide 13 and engage the tap lO (first
Figure 0).

Next, move the parts push rod] 8 forward at low speed and guide 1.
While retracting 3 at approximately the same speed as this, tapping 0 is used to tap the component material M (Fig. 11).
. Thirdly, when tapping is finished, the stopper piece 30 fits onto the tap shaft 9 and enters between the parts P accumulated, and almost at the same time, the part push rod 18 starts to retreat (Fig. 12).

After the component push rod 18 is removed from the tap lO, the tap push rod 20 starts to retreat, and at the same time, the guide 3 starts to move forward, and the tap shaft 9 moves forward by its own weight, and the chuck 6
The stopper piece 30 prevents it from slipping down by 1! +1
The stopped part P falls from the rear end of the tap shaft 9 (FIG. 13). The tap shaft 9 is stopped by a claw piece 26, and the parts push rod]8. The tap push rod 20° guide 3 returns to the position shown in FIG. 8 and one operation is completed.

The part P enters the lower container 3 from the component discharge port 43 of the bed 8, the cutting waste and cutting oil enter the lower container 4 from the cutting waste discharge port 44, and the cutting oil passes through the net at the bottom of the container 4. Return to cutting oil tank 1.

When the tap shaft 9 is arranged horizontally, the tip of the tap 10 and the tap 1fpil! The tip of J20 is designed to be freely attachable and detachable, and the tap shaft 9 is reciprocated by being pulled forward by the tap push rod 20 until it hits the claw piece 26.

As described above, one aspect of the present invention is to curve the rear end of the tag shaft.
Since it has a straight line without any distortion, it can rotate stably without vibration even when rotating at high speed, and is highly efficient and can be used in various shapes.
Not only is it possible to tap screws into large parts, but the guide that holds one part in a non-rotatable manner is movable in the length direction, so screws 3
By moving the component push rod and the guide at the same speed during the process, accurate screw tapping can be achieved. Since the parts are moved in the length direction to engage and disengage from the chuck, when the parts that have been tapped are removed from the chuck, they can be ejected from the rear end in sequence, automatically removing female threaded parts.

It can be manufactured continuously and with high efficiency.

In addition, in the present invention, if the tap shaft is tilted and the screw is tapped on an inclined surface as in the illustrated embodiment, the two parts always advance in close contact with the component push rod, so that accurate screw tapping is possible.
In addition, it is expected that cutting debris and cutting oil can be discharged well, and troubles due to biting of cutting debris will not occur, and cooling circulation of the cutting oil will be performed well.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention;
FIG. 2 is an enlarged partial plan view, and FIG. 3 is an enlarged partial plan view. 4, 5, and 6 are lines AA in FIG. 2. B-11a, C-C#Ii! , D-DitlK 5
Enlarged 111 side view, Figure 7 is a front view of the cam, Figures 8 and 9.
FIGS. 10, 10, and 13 are explanatory diagrams showing the order of operation. 5... Prime mover, 6... Chuck, 8.
...Bed, 9...Tag axis, 10-
...Tap, 13...Guide, ]5...
... Hopper, 18... Parts push rod. 20...Tap push rod, 21, 22, 23.3
3... Prime mover. 27.34...Slip and fall prevention device. Agent Mutsumi Nozawa Aki

Claims (2)

[Claims] (1) A linear tap shaft with a tap at the tip. and a guide arranged around the tap shaft to hold the component so that it can move in the longitudinal direction 5J but not rotate. A hollow component push rod disposed opposite to the tap shaft, a tap push rod inserted into the hollow part, and a character driven by a prime mover to engage and disengage the rear end of the tap shaft. and a hopper disposed in front of the tap to supply component materials, the tap shaft. The guide, parts push rod, and tag push rod are each movable in the length direction, and the tap shaft moves back when the tap 11 rod advances and engages with the chuck, and when the tap push rod moves back, it moves lJ and separates from the chuck. An automatic screw tapping machine characterized by being configured as follows. (2) The automatic screw tapping machine according to claim 11, wherein the tap shaft, the guide, the component pusher, and the tag pusher are arranged at an angle with the chuck positioned at a high force.