JP3370120B2 - Method and apparatus for simultaneous tempering of multiple forming of steel sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for simultaneous tempering of a steel sheet and a multi-time simultaneous tempering apparatus, which can be used for manufacturing a diaphragm spring for an automobile.

[0002]

2. Description of the Related Art As a prior art of an automatic device for forming, quenching, and tempering a steel sheet, there is an "automatic device for forming and heat treating circular parts" disclosed at the rear of JP-A-3-6328.

This is a product in which heat treatment sections for forming, swaging, quenching, tempering, and peripheral tempering are sequentially arranged in order to continuously manufacture a diaphragm spring or a thin circular part. In an automatic device in which (workpieces) are successively transferred to each processing unit, the heating means receives each one from the automatic machine of the press and quenches it, blowing cold air into the center of the work During the tempering process, the central part temperature is lower than the ambient temperature of the work, the cooled work is cooled, and the processed work is stacked and held.

[0004]

However, the automatic device for forming and heat treating circular parts is one in which works are sequentially sent and press-formed by a press die heated to a constant temperature. There is a problem in that the work cannot be sufficiently strained after quenching and tempering due to variations in precision and a small number of press moldings.

The present invention is to quench a circular part made of a thin steel plate,
A technical problem is to provide a method and an apparatus for efficiently correcting the distortion of a work in the distortion correction after tempering.

[0006]

[Means for Solving the Problems] The technical means according to the invention of claim 1 (1st) taken to solve the above technical problems.
Technical means) is a method of correcting the strain generated in the steel sheet at the time of quenching and at the same time tempering the steel sheet, in which a carry-in port is provided on a jig heated to the tempering temperature of the steel sheet in a heating furnace. The step of placing the steel plate after quenching via the interposition, the step of moving the steel sheet and the jig after quenching by the first transverse feeding means to the movable mold side and placing it on the movable mold, A step of pressing the steel plate and jig placed on the movable mold by moving them upward together with a plurality of steel plates and jigs stacked above the steel plate; Existing in the vicinity of the carry-out port by the vertical feed means; a step of moving the steel plate and the jig after the correction of And the process of moving the jig to the vicinity of the loading port. It is to have to perform a plurality of times of press working for sequential repeating the steel plates and the jig to.

The technical means according to the invention of claim 2 (second technical means) taken to solve the above technical problems.
Is a heating furnace heated to the tempering temperature of the steel sheet, a carry-in port formed at one end of the heating furnace for carrying the quenched steel plate, and one end of the heating furnace located above the carry-in port. The carrying-out port for carrying out the tempered steel plates formed in the, the fixed mold fixed to the upper end of the heating furnace, the hardened steel plate is placed, and a plurality of steel plates are stacked in series below the fixed mold in series. A plurality of jigs provided, and a movable die for movably arranging vertically on the other end side in the heating furnace, and a plurality of steel plates and jigs that are stacked between the stationary die and the die, The first transverse feeding means for horizontally moving the steel plate and jig located near the carry-in port to the movable die side and placing the jig on the movable die, and the maximum number of times pressed between the movable die and the fixed die. Second lateral feed for horizontally moving the steel plate and jig located above to the vicinity of the carry-out port And the step is in the fact having a vertical feeding means for moving the entrance near the jig present in outlet port vicinity.

[0008]

The above-mentioned first technical means operates as follows.

The hardened steel plate is placed on a jig located near the carry-in entrance via the carry-in entrance, and the jig is moved to the movable mold side by the lateral feed means and placed on the pressurizing means. To do. On the other hand, above the jig and the steel plate placed on the movable mold, a plurality of steel plates and jigs that have been pressed at least once are stacked and arranged. The jig and the steel plate placed on the movable mold together with the steel plate and the jig are pressed by moving the movable mold upward. After that, the uppermost steel plate and the jig are moved to the vicinity of the carry-out port by the lateral feeding means, and the steel plate is taken out from the jig through the carry-out port.

As described above, since a plurality of jigs and steel plates are stacked above the movable mold for press working, the jigs and steel plates placed on the movable mold must be the jigs (or steel plates) that are stacked. ) Will be pressed a number of times corresponding to the number of), and the distortion of the steel sheet can be reliably corrected. Further, since a plurality of steel plates are pressed simultaneously by the same movable die at all times, the production time is improved and the variation of the steel plates after correcting the distortion is reduced.

The above-mentioned second technical means operates as follows.

Since the movable mold for simultaneously press-forming a plurality of steel plates and jigs stacked between the fixed mold and the fixed mold is provided in the heating furnace, the production time is improved as described above, and
The variation of the steel sheet after correcting the distortion is reduced.

[0013]

Embodiments will be described below with reference to the accompanying drawings.

The present embodiment relates to a method of correcting the distortion generated at the time of quenching the disc plate 1 as shown in FIG. 1 and at the same time tempering.

A multi-molding simultaneous tempering apparatus M for the disk plate 1 used in this embodiment will be described with reference to FIG. Here, this device M is used in the carburizing and quenching process after press molding of the disc plate 1 as shown in FIG.
The clutch mounting surface shown in (3) is easily distorted, and this is for correcting this distortion.

The multi-molding simultaneous tempering device M comprises a heating furnace 3
This heating furnace 3 is surrounded by upper, lower, left and right four-sided walls, and is heated to the tempering temperature of the disk plate 1 by a heater 4 built in the walls.
The wall of the heating furnace 3 on the right end side in the drawing is formed with a carry-in port 3a for carrying in the disk plate 1 after quenching, and the right end of the heating furnace 3 in the drawing is located above the carry-in port 3a. On the side wall, the disk plate 1 after tempering
The carry-out port 3b for carrying out is formed.

A plurality of jigs 2 are arranged in the heating furnace 3 so that the hardened disc plate 1 can be placed thereon. A movable die (pressurizing means) 8a is provided at the left end in the heating furnace 3 in the figure so as to be movable in the vertical direction in the figure. The movable die 8a is connected to a drive source 80 via a rod 80. . The movable die 8a faces a fixed die 8b fixed to the upper end wall of the heating furnace 3, and these movable die 8a
A plurality of jigs 2 on which the above-mentioned hardened disk plates 1 are mounted are stacked in series between a and the fixed die 8b. Therefore, by moving the movable mold 8a upward, a plurality of the hardened disk plates 1 and the jig 2 which are stacked are simultaneously pressed. As a result, the distortion of the disc plate 1 is reliably corrected. Here, in the present embodiment, as shown in FIG. 3, the jigs 2a, 2b, 2c, 2d and 2e are sequentially stacked between the movable mold 8a and the fixed mold 8b in the upward direction. However, the jig is not limited to this, and any number of jigs may be stacked.

On the right end side of the heating furnace 3 in the figure, a vertical feeding means 6 is arranged movably in the vertical direction between the vicinity of the carry-in port 3a and the vicinity of the carry-out port 3b, and is carried in from the carry-in port 3a. The hardened disk plate 1 can be placed on the vertical feed means 6 via the jig 2. In the vicinity of the carry-in port 3a, a first horizontal feed means 5 is arranged so as to be movable in the horizontal direction, and the disc plate 1 and the jig 2 placed on the vertical feed means 6 are moved to the left in the drawing. It can be placed on the movable mold 8a. On the left end side in the drawing of the heating furnace 3, a second lateral feed means 7 is arranged so as to be movable in the horizontal direction, and the disc plate 1 located on the fixed die 8b side is arranged.
And the jig 2 (the disc plate 1 and the jig 2 located at the uppermost position between the movable die 8a and the fixed die 8b) are unloaded to the outlet 3b.
It is designed to be moved to the vicinity. As shown in FIG. 3, a holder 9a and a holder 9b are provided between the movable die 8a and the fixed die 8b, and a plurality of disc plates 1 and 9 are provided between the holder 9a and the holder 9b. A plurality of jigs 2 can be held.

With reference to FIGS. 3 and 4, a method of simultaneous tempering of the disk plate 1 according to the present embodiment by multiple forming and an operation of the apparatus M will be described.

The jig 2a was placed on the vertical feed means 6 located near the carry-in port 3a, and the jig 2a was heated in the heating furnace 3 to the tempering temperature of the disc plate 1.

Next, the carburized and hardened disk plate 1a was carried in from the carry-in port 3a, and the disk plate 1a was placed on the jig 2a mounted on the vertical feeding means 6. (See FIG. 3A) Next, the transverse plate 5 moved the disc plate 1a and the jig 2a to the left in FIG. 3 and placed them on the movable die 8a. After that, the vertical feeding means 6 was moved to the vicinity of the carry-out port 3a. (See FIG. 3B) Next, by moving the movable die 8a upward, the disc plate 1a and the jig 2a placed on the movable die 8a.
Disk plates 1b to 1e and jigs 2b to 2 alternately stacked in series between the holder 9a and the holder 9b.
Pressed together with e, 5 disc plates 1a-
1e was pressed at the same time. At the same time, the disc plate 1a and the jig 2a were sent out between the holder 9a and the holder 9b, and the disc plate 1e and the jig 2e were placed on the holder 9b. In this state, the disc plate 1b and the jig 2b have been pressed twice, and so on.
This means that c is pressed three times, the disc plate 1d and the jig 2d are pressed four times, and the disc plate 1e and the jig 2e are pressed five times. Therefore, in this embodiment, the movable die 8
The disk plates 1a to 1e are pressed as many times as the number of jigs 2 stacked between a and the fixed die 8b. That is, the correction of the distortion of the disc plate 1e and the jig 2e located on the uppermost side is completed. (Fig. 3
(See (a)) Next, after moving the movable die 8a downward in the figure, the uppermost disc plate 1e and the jig 2e placed on the holder 9b by the second traverse means 7 are moved to the position shown in FIG. It was moved to the right and placed on the vertical feeding means 6 located near the carry-out port 3b to finish tempering. At this time, the disc plate 1
The a to 1d and the jigs 2a to 2d are held by the holder 9a and the holder 9b. After that, the disk plate 1e was taken out of the heating furnace 3 through the carry-out port 3b.

Finally, the jig 2e was moved toward the vicinity of the carry-in port 3a by the vertical feeding means 6. (See FIG. 3 (b)) The above steps 1 to 3 are repeated to make each disc plate 1
And, each jig 2 was pressed 5 times.

[0023]

The present invention has the following effects.

(1) As compared with the prior art, the ability to correct quenching distortion is significantly improved and the accuracy is improved.

(2) Since the strain is corrected by one pressurizing means, it is possible to reduce the variation of the strain-corrected work.

(3) Since a plurality of steel plates are pressed by moving the pressing means upward once, the production cycle time per operation can be reduced.

(4) In order to obtain the same productivity with the conventional device, the device for supplying, taking out and accommodating parts becomes complicated.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a disc plate according to the present embodiment,
(A) is a plan view and (b) is a sectional view.

FIG. 2 is a front view including a cross section of a main part of a multi-molding simultaneous tempering device according to the present embodiment.

FIG. 3 is an explanatory diagram of a multi-molding simultaneous tempering method according to the present embodiment, and both (a) and (b) are explanatory diagrams of a procedure in a heating furnace.

4 (a) and 4 (b) are explanatory views of a pressing method in a heating furnace.

[Explanation of symbols]

M steel sheet multi-time forming simultaneous tempering device 1 Disc plate (steel plate) 1a disc plate 1b disc plate 1c disc plate 1d disc plate 1e Disc plate 2 jigs 2a jig 2b jig 2c jig 2d jig 2e jig 3 heating furnace 5 First traverse means 7 Second traverse means 6 Vertical feed means 8a movable 8b fixed type

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 63-125619 (JP, A) JP 3-6328 (JP, A) US Patent 1894590 (US, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) C21D 1/02-1/84 C21D 9/00-9/44 C21D 9/50

Claims (2)

(57) [Claims] 1. A method of straightening the strain generated in a steel sheet during quenching and at the same time tempering the steel sheet, which comprises a jig heated to a tempering temperature of the steel sheet in a heating furnace through a carry-in port. Placing the steel plate after quenching, moving the steel plate after quenching and the jig to the movable mold side by the first transverse feed means, and placing them on the movable mold; Pressing the steel plate and the jig placed on the movable mold together with a plurality of steel plates and jigs stacked above the steel plate by moving the mold upward; A step of moving the steel plate and the jig located at the uppermost position after the distortion is corrected to the vicinity of the carry-out port; a step of taking out the steel plate from the jig moved to the vicinity of the carry-out port through the carry-out port; In front of the jig existing near the exit A multi-step simultaneous tempering of a steel sheet, characterized in that it has a step of moving to the vicinity of the loading port, and that the above steps are sequentially repeated to perform press working for each steel sheet and jig a plurality of times. Method. 2. A heating furnace heated to the tempering temperature of the steel sheet, a carry-in port formed at one end of the heating furnace for carrying the quenched steel plate, and a heating port located above the carry-in port. An outlet for carrying out the tempered steel plate formed at the one end of the heating furnace, a fixed die fixed to the upper end of the heating furnace, and a steel plate after quenching placed and fixed. A plurality of jigs that are stacked in series with the steel plate below the mold, and a plurality of steel plates and jigs that are vertically movable on the other end side of the heating furnace and that are stacked between the stationary mold and the jig. A movable die for simultaneously pressing tools, and a first for horizontally moving a steel plate and a jig located near the carry-in port to the movable die side and placing the jig on the movable die.
A lateral feed means, a second lateral feed means for horizontally moving the uppermost steel plate and the jig, which are pressed a plurality of times between the movable die and the fixed die, to the vicinity of the carry-out port; A multi-time simultaneous forming and tempering device for a steel sheet, comprising: a vertical feed means for moving a jig existing near the exit to the vicinity of the carry-in entrance.