JPH0671575A - Press insertion of plug into passage and machine therefor - Google Patents

Abstract

PURPOSE:To arrange a plug in concentric form for the center of a passage on a work by arranging the plug in press attached state for the passage opened port part for a work. CONSTITUTION:A plug G is installed on the plug installation jig 5 of an air cylinder 4. The air cylinder 4 is pressurization-operated to allow the plug G to be pressed on the passage opened port part 24A of a work W, and set. Then, a pressurizing piston 15 which is arranged, keeping a gap, is attached with an impact toward the air cylinder 4, and the plug G is press-fitted into the passage 24 of the work W by the air cylinder 4. Then, each pressurization force of the air cylinder 4 and the pressurizing piston 15 is released, and then the air cylinder 4 and the pressurizing piston 15 are separated from the work W by the springy members 16 and 17, and holding is performed, keeping a gap S1 between the plug installing jig 5 of the air cylinder 5 and the work W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pressing a plug into a passage to close the opening of the passage by pressing the plug into the opening of the passage, and a plug presser for implementing the method. The plug press-fitting of such a passage is used when a passage that is closed or intersects is used as a single passage.

[0002]

2. Description of the Related Art Conventionally, a generally used plug press-fitting method is to install a plug in a plug mounting jig arranged at the tip of an air cylinder and pressurize the air cylinder to include the plug mounting jig. Is advanced toward the work, and the plug mounted on the plug mounting jig is pressed into the passage opening of the work with a large impact force.

[0003]

According to such a conventional plug press-fitting method, the plug is press-fitted into the passage opening of the work piece at once, and at this time, the axial center of the plug mounting jig and the plug (including the air cylinder) is set. And the center of the passage of the opening of the passage formed in the work are misaligned, it is difficult for the plug to be press-fitted concentrically into the passage, which results in uniform tightening over the entire circumference of the plug. There is a risk that the press-fitting load of the plug will decrease and the airtightness at the opening of the passage cannot be maintained well. Furthermore, the fact that the plug cannot press the inner circumference of the passage with a uniform load means that in the case where the plug is eccentric, a part of the inner circumference of the passage is pressed with a large pressing load. There is a risk of deformation or cracking, which is not preferable in manufacturing. The present invention has been made in view of the above problems, and improves the airtightness in the opening of a passage by press-fitting the plug concentrically with the opening of the passage and reduces the deformation of the work due to the plug press-fitting process. It is an object of the present invention to provide a plug press-fitting method and a plug press-fitting machine suitable for carrying out the method.

[0004]

According to the plug press-fitting method of the present invention, a plug mounting jig provided at the tip of an air cylinder is provided with a plug facing a passage to be drilled in a work and having a gap with respect to the work. First step of mounting; second step of pressing the air cylinder to advance the plug mounting jig of the air cylinder toward the work, and placing the plug in a pressed state against the passage opening of the work. And; at least in the second step, by pressing a pressure piston that is movably opposed to the rear end of the air cylinder in the moving direction of the air cylinder with a gap, the rear end of the air cylinder Abutting by advancing with an impact force toward, and using a jig to attach the plug of the air cylinder, impact the plug into the passage 3 steps; removing the pressure applied to the air cylinder and the pressure piston, retracting the air cylinder and the pressure piston from the work by the elastic force of the elastic member, and at least between the air cylinder plug mounting jig and the work. And a fourth step of forming and maintaining a gap in. The plug press-fitting method is provided with a plug mounting jig that is movably supported in a linear direction with respect to a gantry and that can mount the plug at its tip, and receives a supply of pressurized air to mount the plug including the plug. An air cylinder capable of moving the jig toward the passage opening of the work and stopping the supply of the pressurized air to retract the plug mounting jig from the work; and a pressure chamber and a pressure source of the air cylinder. A first control valve that switches between a first pressurized air passage that connects the pressure receiving chamber and a first atmosphere passage that connects the atmosphere to the atmosphere, and selectively introduces pressurized air or the atmosphere into the pressure receiving chamber;
It is arranged so as to face the rear end of the air cylinder and move freely along the moving direction of the air cylinder, and receives the supply of pressurized air and its tip end abuts against the rear end of the air cylinder with impact force. And a pressure piston capable of impactingly pressing the air cylinder toward the work, while removing the pressing force to the air cylinder when the supply of the pressurized air is stopped; a pressure receiving chamber and a pressure source of the pressure piston A second control valve for selectively introducing pressurized air or atmosphere into the pressure receiving chamber by switching between a second pressurized air passage connecting the pressure receiving chamber and the atmosphere and a second atmosphere passage connecting the pressure receiving chamber and the atmosphere. A first elastic member having an elastic force that separates the tip of the pressure piston from the work; and a second elastic member that has an elastic force that separates the tip of the pressure piston from the rear end of the air cylinder.
It is carried out by a plug press-fitting machine including an elastic member;

[0005]

In the second step, the plug is placed in a pressed state with respect to the passage opening of the work. At this time, the plug is not pressed into the passage opening at once, but the plug is inserted into the passage opening. It is centripetal and can be arranged concentrically. Next, in the third step, the plug is press-fitted into the passage opening by the air cylinder and the plug mounting jig which are moved by the impact force of the pressure piston. Thus, the plug can concentrically block the passage.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a plug press-fitting method and a plug press-fitting machine according to the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a cradle of a plug press-fitting machine, which has a work mounting base 1A on which a work W can be arranged in the lower horizontal direction, a side column 1B extends upward from the work mounting base 1A, and a side column 1
An arm 1C extends horizontally from the upper end of B. The air cylinder support cylinder 2 is arranged on the arm 1C. An air cylinder hole 2A is vertically formed in the air cylinder support cylinder 2, and an upper portion 2C of the air cylinder support cylinder 2 has an internal thread 2B at an upper portion of the air cylinder hole 2A.
The air cylinder hole 2A has a small diameter hole 2D.
Open downwards. A plug screw 3 having a through hole 3A formed in the vertical direction is screwed into the female screw 2B above the air cylinder hole 2A. Reference numeral 4 denotes an air cylinder, which is formed by a piston 4A at an intermediate portion thereof, an upper shaft portion 4B extending upward from the piston 4A, and a lower shaft portion 4C extending downward.
The upper shaft portion 4B is movably supported by the through hole 3A of the plug screw 3 and protrudes above the plug screw 3, and the lower shaft portion 4C is movably supported by the small diameter hole 2D and below the small diameter hole 2D. Project. The upper end of the upper shaft portion 4B constitutes the rear end portion of the air cylinder 4,
The lower end of the lower shaft portion 4C constitutes the tip portion of the air cylinder 4. Reference numeral 5 is an O-ring made of rubber which is fitted and arranged in the piston 4A and keeps the piston 4A and the air cylinder hole 2A airtight. A pressure receiving chamber P1 of the air cylinder 4 is formed in the air cylinder hole 2A between the upper end 4D of the piston 4A and the lower end of the plug screw 3. At the tip of the air cylinder 4, in other words, at the lower end of the lower shaft 4C, a plug G is mounted and a plug mounting jig 5 for press-fitting the plug G is mounted by a tightening nut or the like. The plug mounting jig 5 first holds the plug G in an attracted state, and uses, for example, a permanent magnet or a negative pressure. In this example, a negative pressure hole 5A is formed at the tip opening of the plug mounting jig 5, and the negative pressure hole 5A is formed by applying a negative pressure to the negative pressure hole 5A.
Adsorb the plug G onto the. Secondly, it has a pressing portion 5B for pressing the plug G, and the outer peripheral portion of the negative pressure hole 5A corresponds to this. A coil spring that separates (moves upward) the air cylinder 4 (including the plug mounting jig 5) from the work W between the flange portion 4E provided on the upper shaft portion 4B and the upper end 3B of the plug screw 3. The first elastic member 6 is contracted. On the other hand, the air cylinder support cylinder 2 has a first passage 7 communicating with the pressure receiving chamber P1, a first atmosphere passage 8 communicating with the atmosphere, and a first pressurized air passage 11 communicating with a pressure source 10 via a regulator 9. Each of these passages is switched by the first control valve 12. That is, when the first atmosphere passage 8 and the first passage 7 are in communication, the first pressurized air passage 11 and the first passage 7 are blocked,
When the pressurized air passage 11 and the first passage 7 communicate with each other, the first
The atmosphere passage 8 and the first passage 7 are cut off. Thus, pressurized air and atmospheric pressure are selectively supplied into the pressure receiving chamber P1 of the air cylinder.

Reference numeral 13 is a pressure piston support cylinder having a pressure piston cylinder hole 13A penetrating in the vertical direction, and is arranged on the upper end 2C of the air cylinder support cylinder 2. A pressure piston 15 having a plurality of labyrinth grooves 14A formed on the outer periphery is movably disposed in the pressure piston cylinder hole 13A, and the pressure piston 15 is housed in the upper portion of the pressure piston cylinder hole 13A. The opening is closed by the cover 16. And pressurizing piston 1
5, the pressure receiving chamber P2 of the pressurizing piston 15 is formed by the recess 15A formed in 5 and the cover 16, and the tip end portion 15B (lower end in the figure) of the pressurizing piston 15 has a rear end portion (upper shaft). The pressing piston 15 is opposed to the upper end of the portion 4B, and is further elastically urged in a direction away from the work W (upward in the drawing) by a second elastic member 17 formed of a coil spring. Cover 1
6, a second passage 18 communicating with the pressure receiving chamber P2 of the pressurizing piston 15, a second atmosphere passage 19 communicating with the atmosphere, and the pressure source 1
A second pressurized air passage 20 continuous with 0 is drilled. The passages are switched by the second control valve 21. That is, when the second atmosphere passage 19 and the second passage 18 communicate with each other, the second pressurized air passage 20 and the second passage 18 are blocked, and the second pressurized air passage 20 and the second passage 18 communicate with each other. At times, the second atmosphere passage 19 and the second passage 18 are shut off. Thus, pressurized air and atmospheric pressure are selectively supplied into the pressure receiving chamber P2 of the pressure piston. As the first control valve 12 and the second control valve 21 in this embodiment, electromagnetic control valves that are operated by the magnetic force generated and disappeared in the coils are used.

The electronic control unit 2 22 detects the position of the air cylinder 4 when the air cylinder 4 reaches a certain position below.
3 (hereinafter referred to as ECU) is a position sensor that outputs a signal to the E.C.U. C. U23 outputs a signal to the second control valve 21 to operate the second control valve 21 so that the second pressurized air passage 20 and the second passage 18 communicate with each other, and after a lapse of a certain time, the second pressurization The air passage 20 and the second passage 18 are shut off and the second passage
A signal for operating the second control valve 21 to connect the passage 18 and the second atmosphere passage 19 is output, while the first control valve 12 is output.
For a certain time, the first passage 7 and the first passage
A signal for operating the first control valve 12 so as to communicate with the atmosphere passage 19 and to shut off the first passage 7 and the first pressurized air passage 11 is output.

Next, the plug press-fitting method will be described. The first step is a step of mounting the plug G on the plug mounting jig 5, and is shown in FIG. In the first step, negative pressure is introduced into the negative pressure hole 5A from a negative pressure source (not shown). According to this, the negative pressure hole 5 opened at the tip of the plug mounting jig 5
The plug G is adsorbed and held by A. On the other hand, in the first control valve 12, the first passage 7 and the first atmosphere passage 8 are communicated with each other, the first passage 7 and the first pressurized air passage 11 are blocked and held, and the pressure of the air cylinder is received. The chamber P1 is maintained at atmospheric pressure. Therefore, the air cylinder 4 includes the first elastic member 6
24A of the passage 24 which is urged upward by the elastic force of the upper position and is formed in the plug G and the work W.
A gap S1 is formed between On the other hand, the second control valve 21
In this case, the second passage 18 and the second atmosphere passage 19 are communicated with each other, the second passage 18 and the second pressurized air passage 20 are cut off, and the pressure receiving chamber P2 of the pressurizing piston is maintained at the atmospheric pressure. It
Thus, the pressure piston 15 is biased upward by the elastic force of the second elastic member 17 and is in the upper limit position. In this embodiment, the upper end of the upper shaft portion 4B of the air cylinder 4 is brought into contact with the lower end portion 15B of the pressure piston 15.

Next, the second step is a step of placing the plug G on the passage opening 24A of the work W. In the second step, the first control valve 12 is electrically operated and the first passage 7
And the first pressurized air passage 11 are communicated with each other, and the first passage 7 and the first atmosphere passage 8 are shut off from each other. (The second control valve 21 is kept in the first process state.) According to the above, the pressurized air in the pressure source 10 which is depressurized (for example, 3 kg / square centimeter) by the regulator 9 is in the pressure receiving chamber P1 of the air cylinder. It is supplied through the first pressurized air passage 11 and the first passage 7. According to this, the air cylinder 4 slowly moves down against the elastic force of the first elastic member 6, and the plug mounting cure is performed. The plug G attached to the tip of the tool 5 is the passage opening 24 of the work W.
It is placed on A in a pressed state. In this step, since the air pressure applied to the pressure receiving chamber P1 of the air cylinder is a small pressure, the plug G is not pressed into the passage 24, and the plug G automatically moves with respect to the passage center of the passage opening 24A. Then, it is placed concentrically against the passage 24 while being pressed. On the other hand, in the pressurizing piston 15, the pressure in the pressure receiving chamber P2 of the pressurizing piston 15 is still maintained at the atmospheric pressure.
7, which is held at the upper position, and the upper end portion of the upper end portion 4B of the air cylinder 4 (the gap S2 between the rear end portion of the air cylinder 4) and the tip end of the pressure piston 15.
Is formed and held. This state is shown in FIG.

Next, the third step is a step of press-fitting the plug G into the passage 24 of the work W. At the end of the above-described second step (when the plug G is placed on the passage opening 24A of the work W), the position sensor 22 detects that the air cylinder 4 is at the lower position, and outputs a signal corresponding to it. , C, U23. When the E. C. U23 drives the second control valve 21 to connect the second pressurized air passage 20 and the second passage 18,
The second atmosphere passage 19 and the second passage 18 are shut off. According to the above, the pressurized air (for example, 50 kg / square centimeter) in the pressure source 10 is supplied into the pressure receiving chamber P2 of the pressurizing piston. According to this, the pressurizing air arranged with the gap S2 is provided. The piston 15 suddenly shocks and moves downward against the elastic force of the second elastic member 17, and the tip portion 15B of the pressure piston 15 presses the upper end of the upper shaft portion 4B of the air cylinder 4. Thus, the air cylinder 4 in the state shown in FIG. 2 receives a downward pressing force, and the plug G is pressed into the passage 24 of the work W by the pressing portion 5B at the tip of the plug mounting jig 5. Then, the passage 24 is closed. This is shown in FIG. Then, in the third step, when a certain time (for example, 3 seconds) elapses, E,
A signal is again output from C and U23 to the second control valve 21, the second pressurized air passage 20 and the second passage 18 are shut off by the second control valve 21, and the second passage 18 and the second atmosphere passage are cut off. 19, and the pressure receiving chamber P2 of the pressurizing piston is maintained at the atmospheric pressure again. According to this, the pressurizing piston 15
Is returned to the upper position again by the elastic force of the second elastic member 17. On the other hand, after the elapse of such a fixed time, the E. C.
A signal is also output from the U23 to the first control valve 12, whereby the first control valve 12 shuts off the first pressurized air passage 11 and the first passage 7 and the first atmosphere passage. 8 and the first passage 7 are communicated with each other to maintain the pressure receiving chamber P1 of the air cylinder at the atmospheric pressure again. Then, the air cylinder 4
Is returned to the upper position by the elastic force of the first elastic member 6, and the air cylinder 4 and the pressurizing piston 15 are returned to the state shown in FIG. This completes the work of closing the passage 24 with the plug G. In this example,
When the first control valve 12 and the second control valve 21 are electromagnetic control valves, the E.I. C. Although the operation is controlled by U, the structure of the control valve and the control method thereof are not limited.

[0012]

According to the present invention, the following effects can be obtained. Particularly, in the second step, since the plug is placed in a pressed state against the passage opening of the work, the centripetal effect of the plug allows the plug to be concentrically arranged with respect to the center of the passage. In the third step, since the plug in the above state is press-fitted into the passage by impacting the pressurizing piston, the plug can be press-fitted concentrically to the passage, and the press-fitting load of the plug to the passage is Since it can be made uniform over the entire circumference, the plugging property of the plug can be improved and the productivity of the plug press-fitting can be greatly improved without causing deformation or cracking of the work. Also, the fact that the pressure applied to the pressurizing piston is larger than the force applied to the air cylinder allows the plug press-fitting work by the pressurizing piston to be performed reliably and the small pressurizing force of the plug by the air cylinder. The plug can be placed in the passage opening so that the plug can be arranged concentrically with the passage. Further, the plug press-fitting machine is constituted by the air cylinder, the first control valve, the pressurizing piston, the second control valve, the first elastic member and the second elastic member, which is because the plug press-fitting method is extremely compact. It has been achieved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a plug press-fitting machine according to the present invention, showing a first process state.

FIG. 2 shows a second process state in FIG.

FIG. 3 shows a state of a third step in FIG.

[Explanation of symbols]

 2 Air cylinder support cylinder 4 Air cylinder 5 Plug mounting jig 6 First elastic member 12 First control valve 15 Pressurizing piston 21 Second control valve P1 Air cylinder pressure receiving chamber P2 Pressurizing piston pressure receiving chamber G plug 17 Second Elastic member

Claims (3)

[Claims] 1. A first step of mounting a plug on a plug mounting jig provided at a tip portion of an air cylinder so as to face a passage to be drilled in a work and leave a gap with respect to the work; pressurizing the air cylinder. The second step of moving the plug mounting jig of the air cylinder toward the work and placing the plug in a pressed state against the passage opening of the work; and moving the air cylinder at least during the second step. Direction, the pressure piston, which is arranged oppositely to the rear end of the air cylinder with a gap between them, is moved by an impact force toward the rear end of the air cylinder by pressurizing the piston. The third step of shock-pressing the plug into the passage by using the cylinder plug mounting jig; the air cylinder and the pressure piston A fourth step of removing the pressing force applied to the air cylinder, retracting the air cylinder and the pressure piston from the work by the elastic force of the elastic member, and forming and maintaining a gap at least between the plug mounting jig of the air cylinder and the work. A method of press fitting the plug into the passage. 2. The method for press-fitting a plug in a passage according to claim 1, wherein the pressing force applied to the pressurizing piston is larger than the pressing force applied to the air cylinder. 3. A plug mounting jig, which is movably supported in a linear direction with respect to a mount and has a plug mounting jig capable of mounting a plug at its tip, and which receives a supply of pressurized air and includes the plug. An air cylinder that can move the plug mounting jig backward from the work by stopping the supply of the pressurized air while advancing toward the passage opening of the work; connecting the pressure receiving chamber of the air cylinder and the pressure source. A first control valve for switching between a first pressurized air passage and a first atmosphere passage connecting the pressure receiving chamber and the atmosphere to selectively introduce pressurized air or atmosphere into the pressure receiving chamber; a rear end of an air cylinder The air cylinder is arranged so as to be opposed to the air cylinder and movable along the moving direction of the air cylinder. And a pressure source that is capable of removing the pressure force to the air cylinder when the supply of the pressurized air is stopped; and a pressure receiving chamber of the pressure piston and a pressure source. A second pressurized air passage, a second atmosphere passage connecting the pressure receiving chamber and the atmosphere,
The second control valve for selectively introducing pressurized air or the atmosphere into the pressure receiving chamber, and the first elastic member having an elastic force for separating the tip end portion of the air cylinder from the work; A second elastic member having an elastic force to separate from the rear end of the air cylinder;