JP2762381B2 - Method and apparatus for molding a molded article by multi-axis molding apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and apparatus for molding a molded article by a multi-axial molding apparatus for molding or drilling a molded article from a plurality of directions, and particularly to a machine. TECHNICAL FIELD The present invention relates to a molding method of a molded product by a multi-axial molding device driven by a hydraulic pressure generating device of the type and a device therefor.

For example, as a forming apparatus for a product requiring processing from a plurality of directions, as typified by a valve body and a pipe joint (cross elbow), a plurality of plungers are connected to a normal uniaxial mechanical press via a link mechanism or the like. And a mechanical multi-axis molding device for forming a workpiece by sequentially operating the plurality of plungers in conjunction with the operation of the power source of the mechanical press as a drive source, 2. Description of the Related Art A hydraulic multi-shaft forming apparatus or the like that operates a plurality of hydraulic cylinders via a hydraulic servo valve or a switching valve using a known hydraulic pump or the like as a hydraulic pressure source is known.

In addition, a mechanical constant-discharge-type hydraulic pressure generating device [hereinafter referred to as a “power generator” (registered trademark) that takes advantage of mechanical and hydraulic power sources as a power source of the press. ], The pressure oil discharge side of the cylinder of the power generator and the slide pressure side of the press cylinder are connected by a pipeline, and the slide back side of the cylinder of the power generator and the slide retraction side of the press cylinder are connected by a pipe. Power generator driven hydraulic presses connected by roads are also known.

Here, the power generator is described in, for example, Japanese Patent Application Laid-Open No. 61-25 / 1986.
It is capable of instantaneous starting, stopping, and generating large output as described in Japanese Patent No. 5281 or JP-A-61-255283, and has a compact structure, and connects a plurality of molding cylinders in parallel. And a mechanism that can be configured to operate sequentially by switching valves.

[Problems to be Solved by the Invention] Among the above-described multi-shaft molding apparatuses, those using a normal mechanical press as a power source are advantageous in that they can perform high-speed operation, but the configuration of each part of the apparatus is complicated, In addition, there is a problem that accuracy is poor due to an impact at the time of operation, and it is difficult to change a stroke or a direction of a plunger due to the use of a link mechanism, and lacks versatility.

The hydraulic multi-axis molding machine described above has a relatively simple overall structure and high accuracy. However, it cannot temporarily obtain high-pressure, large-capacity pressurized oil. In the case of work that requires a large volume of pressurized oil, a large-capacity oil pressure generator is required to increase work efficiency, which is expensive, and conversely, when a small-capacity oil pressure generator is used, the molding speed is slow. There are drawbacks such as inevitable work efficiency.

On the other hand, a press using a power generator has the advantages of both the mechanical type and the hydraulic type as described above, but there is no multi-axis forming apparatus integrally formed, and high-speed, high-precision and versatile There is a demand for a high power generator driven multi-axis molding apparatus.

[Means for Solving the Problems] A method for molding a molded product by a driving multiaxial molding device according to the present invention is a multiaxial molding device having a molding punch arranged to advance and retreat from a plurality of directions with respect to a molded product. After closing the periphery of the molded object by closing the mold, the synchronous cylinder is operated by the pressure oil from the mechanical hydraulic pressure generator, and the one-way molding is performed by the pressurized hydraulic oil discharged from the synchronous cylinder. The punch is operated to perform the punching, and then another synchronous cylinder is operated by the pressurized oil from the mechanical hydraulic pressure generating device, and the pressurized hydraulic oil discharged from the synchronous cylinder is used in at least one other direction. By sequentially operating the forming punches to perform the punching, the forming punches in the plurality of directions are sequentially subjected to the pressurizing operation within one cycle of the mechanical hydraulic pressure generating device to form the workpiece. It is in.

When the object to be molded has a projection, the side having the projection is punch-formed first.

Further, in a multi-axis molding apparatus having a molding punch arranged to advance and retreat with respect to the molded object from a plurality of directions,
A plurality of press cylinders for moving the forming punch forward and backward, a plurality of synchronous cylinders provided one by one corresponding to the plurality of press cylinders, and communicating with a slide pressing side of the press cylinder; A mechanical hydraulic pressure generating device connected to a piston pressurizing side of a synchronous cylinder and connected to a slide retraction side of the press cylinder via a retraction line; and And a valve device for selectively operating the cylinder.

Example Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an overall system diagram of a power generator driven multi-axis molding apparatus according to an embodiment of the present invention.

The power generator 11 is described in Japanese Patent Application Laid-Open No. 61-255281.
Or a mechanical constant discharge type hydraulic pressure generating device utilizing a crank or an eccentric cam as described in JP-A-61-255283, in which a cylinder 11a operates in accordance with the operation of a piston / slide 11b. And is pivotally supported around the support shaft 11c. One end of the slide 11b (opposite the piston) is connected to the crankshaft 11d, and is driven by an electric motor (not shown).
The cylinder 11a slides by rotation of 11d. The sliding of the slide 11b causes the pressurized oil chamber 11e of the cylinder 11a to move.
In addition, constant discharge and suction of the working oil in the retraction oil chamber 11f are performed.

A pair of press cylinders are disposed to face each other to form one press cylinder pair 12,13, and another pair of press cylinders are similarly disposed to face each other and the other press cylinder pair 14,1 is formed.
5 are configured.

Next, referring also to FIG. 3, FIG. 4 or FIG. 5, in this embodiment, these press cylinder pairs 12, 13, and 14, 15 are arranged so as to be orthogonal in a horizontal plane or a vertical plane. Is done.

It should be noted that the number of the press cylinder pairs is not necessarily two;
Around and at any angular orientation.

Corresponding first and second synchronous cylinders 16, 17 are provided for each press cylinder pair 12, 13, and 14, 15, respectively. Synchronous cylinders 16 and 17 have pistons 35 and 36, respectively.
On one side, there are pressurized oil chambers 18, 19 having the same cross-sectional area, and ports 20, 21, It has 22.

Further, as described later, the pressurized oil chamber 11e of the power generator 11 is communicated with the piston pressurized side of each of the synchronous cylinders 16 and 17 via the pressurized pipeline 23, and the retraction oil chamber 11f of the power generator 11 is Each press cylinder 1 via the retraction line 24
It is connected to the slide retraction side of 2,13 and 14,15.
The pressurized oil chambers 18 and 19 of the synchronous cylinders 16 and 17 are connected to the press slide pressurizing sides of the press cylinder pairs 12, 13 and 14, 15 through the ports 21 and 22, respectively.

First and second synchronous cylinders 1 from power generator 11
These synchronous cylinders 1
Selection valve device for sequentially and selectively switching the operations of 6, 17
25 are provided. The pressure line 23 branches into a first branch line 23a leading to the first synchronous cylinder 16 and a second branch line 23b and 23b 'leading to the second synchronous cylinder 17 on the way.

The selection valve device 25 of the embodiment shown in FIG.
Check valve 26 interposed in the second pipe 23
b, a switching valve 27, solenoid valves SV1 and SV2 for these valves 26 and 27, and a pilot hydraulic pressure that enables the operation of the pilot check valve 26 and the switching valve 27 via the solenoid valves SV1 and SV2. Source 28.

A pipe 23a 'branched from the branch pipe 23a in FIG.
Is provided with a relief valve 29 for preventing an excessive load during switching. The pipe 23 'and the pipe 23b' are connected by a pipe. The switching valve 27 is set so that the solenoid valve SV2 is turned off and closed.

On the other hand, the preload pressure is always applied to the retraction line 24 by the accumulator 30, and the slide of each press cylinder pair is thereby constantly pressed against the retraction side. Reference numeral 31 denotes a preload auxiliary hydraulic pump connected to the return pipe 24.

In this configuration, after the molding object 10 is first carried into the lower mold 9 by a transport device (not shown), the upper mold 8 descends and the molding object 10
Is closed with upper and lower dies 8, 10. After that, the solenoid valve SV
The hydraulic oil discharged from the power generator 11 in a state in which both the first synchronous cylinder 16 and the first synchronous cylinder 16 are turned off is guided to the first synchronous cylinder 16 through the pilot check valve 26.
To the first pair of press cylinders 12, 13.

Therefore, in the case of FIG. 3, the forming punches 1 and 2 mounted on the tips of the first press cylinders 12 and 13 provided facing each other operate in synchronization with the pressurized oil in the X direction of FIG.

For this reason, the molded object 10 is pressure-formed by the forming punches 1 and 2 while being clamped by the upper die 8 and the lower die 9. When the limit switch 32 provided at the tip of the first pair of press cylinders (the pair of X-direction press cylinders) 12 and 13 is turned on, the solenoid valve SV2 is turned on (the switching valve 27 is opened) and the pressurizing line is opened. The pressure oil of 23 passes through the switching valve 27 and
The synchronous cylinder 17 is operated. Accordingly, the forming punches 3 and 4 mounted on the tips of the second pair of press cylinders 14 and 15 are operated, and synchronous forming in the Y direction in FIG. 3 is performed. At this time, if the pressurizing pressure in the X direction decreases, the pipe 23 is connected to the first synchronous cylinder 16 via the pilot check valve 26.
More pressurized oil is introduced, and the press cylinder pair 12, 13 in the X direction is repressurized.

Next, when the power generator 11 reaches the bottom dead center and the pressurizing operation is completed, each press cylinder pair 12, 13 and 14, 15
(Punches 1, 2 and 3, 4) enter the retraction process.

At this time, since the switching valve 27 is open, first, the second
Press cylinder pair (Y direction press cylinder pair) 14,15
The pressure oil on the pressurizing side of the (punches 3 and 4), that is, the pressure oil on the piston pressurizing side of the second synchronous cylinder 17 is
Is returned to the pressurized oil chamber 11e.

When the slide 11b of the power generator 11 reaches the bottom dead center, the solenoid valve SV1 of the pilot check valve 26 is turned on by the bottom dead center detection signal, the pilot check valve 26 is opened, and the first press cylinder pair 12, The 13-side pressurized oil, that is, the pressurized oil on the piston pressurized side of the first synchronous cylinder 16 is similarly returned from the pressurized pipe line 23 to the power generator 11.

Next, when the retraction operation of the first and second press cylinder pairs 12, 13, 14, 15 is completed, the retraction process of the upper die 8 is started. Upper die 8
Is retracted to the upper limit, the retraction operation ends and the molding operation 1
The cycle ends.

FIG. 4 shows an example in which the opposed dies 5, 6 and the forming punches 3, 4 are arranged orthogonally in a vertical plane. The dies 5, 6 clamp the molded object 10 and form the outer shape. Holes are punched on the end face with the forming punches 3 and 4. FIG. 3 shows an example in which dies 5 and 6 and forming punches 3 and 4 are attached to the tip of a press cylinder, respectively, as in FIG. 3. In the example shown in FIG. Although the cylinder pairs 14 and 15 operate so as to intersect in the horizontal direction, the cylinders 14 and 15 operate in such a manner as to intersect in the vertical direction in the example of FIG. 4, but the substantial operations are the same. Further, in the example of FIG. 4, the cylinder pair of FIG. 1 also functions as a mold clamping cylinder, so that the mold clamping cylinder can be omitted.

The example shown in FIGS. 5 (a) and 5 (b) shows an example in which a molded product has a protrusion such as a flange or a flange (hereinafter referred to as a protrusion).
This is an example of molding a product in which a molding 10 ′ is formed. First, the molding punches 1 and 2 on the side where the projection 10 ′ is formed on the molding object 10 are operated first, and then the molding punches on another side are formed. The molding is performed by operating 3, 4 and the actual operation is the third
This is the same as the example shown in the figure.

In the case of FIGS. 5 (a) and 5 (b), the material (molded object) near the protruding portion 10 'is pushed up to the protruding portion 10' side by a forming punch which is operated later, and the protruding portion 10 ' The material flows reliably and a good quality product is made.

FIG. 6 is a time chart of the die / punch stroke of the apparatus according to the present invention, and shows the lapse of time of the upper die 8 and the forming punches 1, 2, 3, and 4 (press cylinder pair 12, 13, 14, 15). Is a diagram illustrating the stroke operation associated with.

First, the upper die 8 descends and comes into contact with the lower die 9 so that the upper and lower
The molds 8 and 9 are clamped, and the periphery of the molded object 10 is closed. At the same time as the closing is completed, the forming punches 1 and 2 on the X direction start the forming operation.

When the forming operation of the forming punches 1 and 2 is completed, the forming punches 3 and 4 on the Y direction side start the forming operation. When the forming punches 3 and 4 complete the forming operation, the forming punches 3 and 4 and the forming punches 1 and 2 both enter a retraction operation, and all the forming punches 1, 2, and
3,4 is withdrawn.

When the retraction operation of the forming punches 1, 2, 3 and 4 is completed, the upper die 8 is raised to open the die, and when the upper die 8 reaches the upper limit, one cycle is completed.

FIG. 2 is a circuit diagram showing another embodiment of the selection valve device 25 of the present invention.

The selection valve device 25 of this embodiment is designed so that either the X-direction press cylinder pair 12, 13 or the Y-direction press cylinder pair 14, 15 can be operated first. A second switching valve 33 and a second switching valve solenoid valve SV3 are provided in addition to the pilot check valve 26 in a first pipeline 23a branched from the pressurization pipeline 23, and a second pipeline 23b is provided in the first pipeline 23b. In addition to the switching valve 27 of the first embodiment, a second pilot check valve 34 and a second pilot check valve solenoid valve SV4 are provided.

For example, when the X-direction press cylinder pair 12, 13 is operated first, the second switching valve 33 added as described above is used.
The second pilot check valve 34 is kept open, and the switching valve 27 and the pilot check valve 26 are switched as described above.

Conversely, when the Y-direction press cylinder pairs 14 and 15 are operated first, the switching valve 27 and the pilot check valve 26 are kept open, and the second switching valve 33 and the second pilot check valve 34 are signaled. To open and close. In both cases, when the press cylinder pair is opened, both the X and Y directions are opened simultaneously.

In each of the embodiments described above, the case of the four-axis press in which the press cylinder pair is provided in the two directions of X and Y has been described. However, one of the one press cylinder pair is removed to perform the three-axis press. Alternatively, a plurality of pairs may be provided around the molding object.

[Effects of the Invention] As described above, according to the present invention, a mechanical and hydraulic press is used as a driving source by a mechanical constant discharge type hydraulic pressure generating device, which is a hydromechanical driving device, and high speed and high precision are achieved. Thus, molding can be performed in a predetermined order from any direction. In addition, various processings such as flat hitting and drilling can be performed on the processing shape, thereby improving the yield of the product and reducing the machining allowance due to machining in the post-process.

In addition, for a product having a protruding portion, there is another effect that a high-quality product can be manufactured by first punching the side having the protruding portion.

[Brief description of the drawings]

FIG. 1 is an overall system diagram showing one embodiment of the present invention, FIG. 2 is a schematic diagram of a selection valve device according to another embodiment of the present invention, and FIG. 3 is a press cylinder slide in horizontal four-direction molding. FIG. 4 is a schematic perspective view showing the operation direction of the press cylinder slide in the case of vertical four-direction molding, and FIGS. FIG. 6 is a schematic diagram showing a molding operation of a brimming product, and FIG. 6 is a mold / punch stroke-time diagram of the present invention. 10 …………………………………………………………………………………………………………………………………………………………………………………… Pending ceremony 18,19… Pressurized oil chamber 23… Pressurized line 23a, 23b, 23a ′, 23b ′… Branch line 24… Return line, 25… Selection valve device 26,34… Pilot check Valves 27, 33… Switching valves SV1 to SV4… Solenoid valves

Claims (3)

(57) [Claims] 1. A multi-axis molding apparatus having a molding punch having a plurality of molding punches arranged so as to advance and retreat from a plurality of directions. Activate the synchronous cylinder with pressure oil from the generator,
The one-way forming punch is operated by pressurized hydraulic oil discharged from the synchronous cylinder to perform punching, and then another synchronous cylinder is operated by pressure oil from the mechanical hydraulic pressure generating device, and the synchronous cylinder is operated. By sequentially operating the forming punches in at least one other direction with the pressurized hydraulic oil discharged from the apparatus, punching is performed to sequentially press the forming punches in the plurality of directions in one cycle of the mechanical hydraulic pressure generating device. A method for molding a molded article by a multi-axial molding apparatus, wherein the molding is performed by performing an operation. 2. The method according to claim 1, wherein when the object has a protrusion, the side having the protrusion is punched first. 3. A multi-axis molding apparatus having a forming punch arranged to advance and retreat from a plurality of directions with respect to a molded object, a plurality of press cylinders for moving the forming punch forward and backward,
One body is provided for each of the plurality of press cylinders,
And a plurality of synchronous cylinders communicating with the slide pressing side of the press cylinder, and a sliding retraction side of the press cylinder connected to a piston pressing side of the synchronous cylinder via a pressure line, and a retraction line. And a valve device provided in the pressurizing line and selectively operating the plurality of synchronous cylinders.