JPS63248577A - Manufacture of cylinder rod with ball - Google Patents

Abstract

PURPOSE:To perform welding and heat treatment in full automation and to continuously produce with short production tact by automatically feeding a steel rod and steel ball by a transfer device to welding and heat treatment stages. CONSTITUTION:A steel rod 1 is fed onto the backup 4 of a 1st station S1 by the chuck device 3 of a transfer device 2 and a steel ball 8 is fed to a steel ball receiving part 7 to hold them by the sucking force of the air. A movable electrode 6 is descended and the steel ball 8 is pressed to the steel rod 1 and welded. It is then fed to a 2nd station S2, the steel ball 12 is fed to the steel ball receiver 7 of the movable electrode 11 and the steel ball 12 is welded by pressing it to the lower end of the steel rod 1. A cylinder rod W is then fed onto the backup 15 of a 3rd station S3 by a chuck device 14, a movable electrode 17 is descended and the weld zone is heated to reduce the hardness of the weld zone. It is then transferred to a 4th station S4, the cylinder rod W is pressed by a backup 19 and movable electrode 20 and the weld zone of the steel ball 12 is heated to subject the hardened weld zone to heat treatment. With the completion of the heat treatment the cylinder rod W is transferred to the following stage by a chuck device 22.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method of manufacturing a cylinder rod used for example in an automobile air conditioner compressor. Welding process to pressure-weld the steel balls incorporated as an insert, and then
The present invention relates to a method of manufacturing a cylinder rod with balls, which includes heating a welded part and annealing the welded part to have a hardness equal to or at least lower than that of the base material as it is as welded.

(Prior Art) Conventionally, a cylinder rod with a pole that is incorporated into a piston cylinder of the compressor, etc. is connected to the piston connecting side of the polished steel rod that forms the cylinder rod and the electric motor in order to convert the rotational movement of the electric motor into linear piston movement. It is constructed by forming a pole joint on the side and welding the connecting steel balls for the bearing, and then heat treating the welded part to increase durability.

(Problem to be solved by the invention) However, in the conventional manufacturing method, the work process from welding to post-weld annealing is almost inefficient, so there is not only variation in precision but also production It lacks safety and performance, and is undesirable from an industrial manufacturing standpoint.

(Means for Solving the Problems) Therefore, the present invention provides a manufacturing method that fully automatically and accurately performs a process from welding a steel ball and steel rod to a heat treatment process for the welded part. In this method, a steel rod is supplied to the welding position, held by a bank up and a power supply clamp, and then a steel ball held on the electrode surface of a movable electrode is pressed onto one tip of the steel bar to connect the power supply clamp and the movable electrode. A first station for applying pressure and welding by applying an electric current to the steel rod, carrying out the steel rod from the first station, and then pressurizing and welding a steel ball held on the electrode surface of the movable electrode to the other end of the steel rod. At the second station, the steel rod welded at the second station is continuously transported and supplied to the annealing processing position, held by a bank amplifier and a power supply clamp, and a current is passed between the power supply clamp and the movable electrode. A third station anneales the welded part of the steel ball. After being annealed at the third station, it is again supplied to the next annealing position and held by a bank amplifier and a power supply clamp, and the power supply clamp and movable electrode are connected to each other. and a fourth station for annealing the welded portion of the other steel ball by applying a current to the fourth station.

In addition, when a steel ball is directly attracted to the electrode surface of the movable electrode and pressurized to the other steel rod, and a current is passed between the power supply clamp and the movable electrode to pressurize and weld, the power supply clamp and the movable It is characterized in that a stopper is interposed between the movable electrode and the movable electrode to regulate the amount of displacement of the movable electrode in the pressurizing direction, thereby eliminating variations in welding quality.

(Example) Hereinafter, "Example" of the present invention will be described with reference to the drawings.

Note that FIG. 1 is a schematic diagram of the case where cylinder rods are produced by a fully automatic line method according to the method of the present invention.

In the figure, first, a steel rod 1 sent from a parts feeder (not shown) is transferred to a chuck device 3 of a transfer device 2.
It is sent onto the bank up 4 placed at the welding position of the first station Sl.

After the steel rod 1 is fixed with a backup 4 and a power supply clamp 5, a movable electrode 6 that moves up and down corresponding to the upper end of the steel rod 1
A steel ball 8 is supplied directly below the steel ball receiving portion 7 formed on the electrode surface of the steel ball receiving portion 7, and is attracted by the suction force of the air sucked from the steel ball receiving portion 7.
Retained. Next, the movable electrode 6 is lowered, the steel ball 8 is pressed against the upper end of the steel rod 1, and a welding current is passed through the power supply clamp 5 and the movable electrode 6 to pressurize and weld the steel rod 1 and the steel ball 8. .

Next, the steel rod 1 that has been welded at the first station S1 is sent to the second station S2 by the chuck device 9, and here, as in the previous process, the steel rod 1 is sent under the bank up 10 to correspond to the lower end of the steel rod. The steel ball 12 is supplied to the steel ball receiving portion 7 on the electrode surface of the movable electrode 11 that moves up and down, and is attracted and held. Next, the movable electrode 11 is raised, the steel ball 12 is pressed against the lower end of the steel rod 1, and a welding current is passed between the power supply clamp 13 and the movable electrode 11 to pressurize and weld the steel rod 1 and the steel ball 12. do. The cylinder rod W formed by welding at the second station S2 is supplied onto the backup 15 at the third station S3 by the chuck device 14, and fixed by the bank up 15 and the power supply clamp 16. Next, the movable electrode 17 is lowered and the cylinder rod W is held down between the bank ups 15 and a current is passed between the power supply clamp 16 and the movable electrode 17 to heat the welded part, so that the hardness of the welded part is at least equal to or equal to that of the base material. Reduces hardness with better reproducibility than as-welded. Next, after annealing of one welded portion is completed at the third station S3, the cylinder rod W is transferred to the fourth station S4 by the chuck device 18. It is supplied between the backup 19 and the movable electrode 20. Here, as in the previous step, the cylinder rod W was held down by the backup 19 and the movable electrode 20, and a current was passed between the power supply clamp 21 and the movable electrode 20 to heat and harden the welded part of the other steel ball 12. Heat treat the weld.

When the heat treatment is completed, the cylinder rod W is moved to the movable electrode 20.
Then, the power supply clamp 21 is released, and the cylinder rod W is transported to the next process by the chaff device 22.

In addition, when welding the steel ball held on the electrode surface of the movable electrode,
By inserting the stopper 23 between the power supply clamp and the movable electrode, the stopper 23 can fix the depth h of the groove in the steel ball receiving portion even if the electrode movement changes due to wear on the electrode surface. This eliminates variations in welding quality.

FIGS. 2 and 3 are a sectional view of a main part and a plan view thereof showing the unit structure of the movable electrode device arranged at the first and second stations.

These movable electrodes 6 and 11 have a slide body 26 fixed with a chip holder 25 into which an electrode chip 24 is fitted, and a bolt B1 in two directions indicated by arrows (a) and (b) as shown in FIG.
B2 is attached to a platen 28 fixed to the ram 27 of the pressure cylinder of the welding machine so that the movement can be adjusted.

Consideration has been taken to facilitate centering of the positioning accuracy of the steel ball with respect to the tip of the steel rod.

FIG. 4 is a sectional view of a main part showing the unit structure of the movable electrode device arranged at the third and fourth stations.

The movable electrodes 17 and 20 have a secondary bar 30 fixed to a platen 29 fixed to a ram of a pressurizing cylinder, and an electrode tip 33 fitted into a cylinder 32 of a disk 31 fixed to the secondary bar. The attached chi-knob holder 34 is rotatably attached via a link ball 35 forming a universal joint. The chip holder 34 is connected to the secondary bar 30 via a flexible conductive wire 38, and is supported by the ball plunger 36 of the disc 31 so as to be freely movable. This allows the movable electrode to move freely so that the steel ball receiving portion on the electrode surface perfectly matches the spherical surface of the steel ball.

Note that the electrode tip 33 fitted into the tip holder 34 can be easily attached/detached and replaced by a tip extractor nut 37.

(Effects of the Invention) As described above, according to the present invention, when manufacturing cylinder rods of refrigeration compressors used in automobile air conditioners with high precision, polished steel rods and copper balls are processed at four stations. Since welding and heat treatment can be performed fully automatically while automatically supplying the welding and heat treatment process using a transfer device, cylinder rods can be continuously produced in a short production tact.

In addition, by providing a stopper between the movable electrode and the power supply clamp during welding to regulate the amount of displacement due to electrode wear,
By keeping the depth h of the steel ball receiving portion on the electrode surface constant, high welding quality can always be obtained uniformly.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a fully automatic line of the manufacturing method according to the present invention. FIG. 2 is a sectional view of a main part showing a structural example of a movable electrode used in the welding process of the present invention. FIG. 3 is a plan view of the movable electrode. FIG. 4 is a sectional view of a main part showing an example of the structure of a movable electrode used in the heat treatment process of the present invention. 1. Steel rod 8.12... Steel ball W... Cylinder rod 4.10... Backup 5.13...
Power supply clamp 6.11...Movable electrode 7...Steel ball receiving part 17.20...Movable electrode 16.21...
Power supply clamp 15.19...Backup S,...
1st station B2...2nd station S3
...3rd station 5403. 11-

Claims (1)

[Claims] 1. A steel rod supplied from a predetermined position is held by a backup and power supply clamp, and a steel ball held on the electrode surface of a movable electrode is pressed against one tip of the steel bar to supply power. A first station where a current is applied between the clamp and the movable electrode to apply pressure and weld. A steel rod is carried out from the first station, and then a steel bar held on the electrode surface of the movable electrode is placed on the other end of the steel bar as described above. A second station pressurizes and welds the balls, and the cylinder rod with balls formed through the second station is subsequently transported and supplied to a predetermined position in the same manner as described above, held by a backup and power supply clamp, and a movable electrode A third station presses one steel ball and applies a current between the power supply clamp and the movable electrode to anneal the welded part of one steel ball. After annealing at the third station, this is again subjected to the next annealing process. A method for manufacturing a cylinder rod with balls, the method comprising: transporting the cylinder rod to a position and holding it with a backup and power supply clamp; and a fourth station for annealing the welded part of the other steel ball by passing a current through the power supply clamp and a movable electrode. 2. Manufacturing a cylinder rod with balls according to claim 1, which, when holding a steel ball on the electrode surface of a movable electrode, attracts and holds the steel ball with the air suction force of the steel ball receiving portion formed on the electrode surface. Method. 3. When applying pressure and welding the steel ball held on the electrode surface of the movable electrode by passing a current between the power supply clamp and the movable electrode, a stopper is interposed between the power supply clamp and the movable electrode. A method for manufacturing a cylinder rod with a ball according to claim 1 or 2, wherein the amount of displacement in the pressurizing direction is restricted.