JPH03207544A - Method and apparatus for forming formed material with multi spindle forming apparatus and apparatus thereof - Google Patents

Abstract

PURPOSE:To improve the yield and to reduce allowance thickness for machining by utilizing merits in mechanical type and hydraulic type presses with pressure oil from a mechanical type hydraulic generating apparatus and executing forming at the same time or in the prescribed order from the optional direction at high speed and with high accuracy. CONSTITUTION:Forming punches 1, 2 fitted to tip parts of press cylinders 12, 13 arranged as mutually facing, are synchronously worked in X-direction with the pressure oil. A material 10 to be formed is pressurized to form with the forming punches 1, 2 under condition of die clamping with upper die 8 and lower die 9. When a limit switch 32 arranged at the tip parts of the first pair of press cylinders 12, 13 turns to 'ON', a solenoid valve SV2 comes to 'ON' (selector 27 is opened), and the pressure oil works a synchronizing cylinder 17 and forming punches 3, 4 fitted to tip parts of second pair of press cylinders 14, 15 are worked to execute synchronous forming in Y-direction. By this method, the forming can be executed at the same time or in the prescribed order from the optional direction at a high speed with high accuracy and the yield of product can be improved.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method and apparatus for molding a molded product using a multi-axis molding device that performs molding or drilling on a molded product from multiple directions, and particularly relates to The present invention relates to a method for molding a molded article using a multi-axis molding device driven by a type of hydraulic pressure generating device, and an apparatus therefor.

For example, as a forming processing device for products that require processing from multiple directions, such as valve bodies and piping joints (cross elbows), multiple plungers are connected to a normal uniaxial mechanical press via a link mechanism, etc. A mechanical multi-axis forming device which uses the power of the mechanical press as a drive source and sequentially operates the plurality of plungers to form the molded object in conjunction with the operation of the mechanical press, and 2. Description of the Related Art Hydraulic multi-axis forming apparatuses and the like are known in which a plurality of hydraulic cylinders are operated via hydraulic servo valves or switching valves using a known hydraulic pump or the like as a hydraulic power source.

In addition, as a power source for the press, we have developed a mechanical constant-discharge hydraulic pressure generator [hereinafter referred to as a "power generator" (product name)] that takes advantage of the advantages of mechanical and hydraulic systems. ]
using a pipe to connect the pressure oil discharge side of the cylinder of the power generator and the slide pressure side of the press cylinder',
A hydraulic press driven by a power generator is also known, in which the slide back side of the cylinder of the power generator and the slide retraction side of the press cylinder are connected by a conduit.

Here, the power generator is, for example, published in Japanese Unexamined Patent Application Publication No. 1986-1.
- Instantaneous activation as described in No. 2 5 5 8 1 or Japanese Patent Application Laid-Open No. 61-23 5583,
It is capable of stopping and generating a large output, has a compact structure, and has a mechanism in which a plurality of molding cylinders are connected in parallel and can be operated in sequence by switching valves.

[Problems to be Solved by the Invention] Among the above-mentioned multi-axis forming apparatuses, those using an ordinary mechanical press as a power source are advantageous in that they can operate at high speed, but the configuration of each part of the apparatus is complicated, Furthermore, since a shock is generated during operation, accuracy is poor, and since a link mechanism is used, for example, it is difficult to change the stroke or direction of the plunger, resulting in a lack of versatility.

In addition, while the hydraulic multi-axis forming equipment mentioned above has a relatively simple overall structure and high precision, it can temporarily obtain high pressure and large volumes of pressurized oil. In the case of work that requires a large capacity of pressure oil, in order to improve work efficiency, a large capacity hydraulic pressure generator is required and is expensive; on the other hand, if a small capacity hydraulic pressure generator is used, There are drawbacks such as slow molding speed and poor work efficiency.

On the other hand, presses using power generators have the advantages of both the mechanical and hydraulic types mentioned above, and there is no multi-axis forming machine that is integrated into one, and is fast, highly accurate, and versatile. There is a desire to realize a power generator-driven multi-axis molding device with high performance.

[Means for Solving the Problems] A method for forming a molded article using a driven multi-axis forming apparatus according to the present invention includes a multi-axis forming apparatus having forming punches arranged to move forward and backward relative to the object to be formed from a plurality of directions. After closing the periphery of the molded object by clamping the mold, a unidirectional forming punch is actuated by pressure oil from the mechanical hydraulic pressure generating device to perform punch processing, and then the mechanical hydraulic generating device By sequentially operating the forming punches in at least one other direction using pressurized oil from The reason lies in the fact that it is made to be molded.

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

Further, in a multi-axis forming apparatus having forming punches arranged to move forward and backward relative to the object to be formed from a plurality of directions, a plurality of press cylinders for advancing and retracting the forming punches, and one press cylinder for each press cylinder are provided, and a plurality of synchronous cylinders that communicate with the sliding pressure side of the press cylinder, and a plurality of synchronous cylinders that are connected to the piston pressurization side of the synchronous cylinder via a pressurization line, and that are connected to the slide pressurization side of the press cylinder via a return line. The present invention includes a mechanical hydraulic pressure generating device connected to the slide retraction side, and a valve device provided in the pressurizing conduit and selectively operating the plurality of synchronized cylinders.

[Embodiments] Next, embodiments 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 manufactured by the above-mentioned Japanese Patent Application Laid-Open No. 61-25
5281 or Japanese Patent Application Laid-Open No. 61-2 55282, this is a mechanical constant discharge type hydraulic pressure generating device using a crank or eccentric cam, etc., in which the cylinder lla is a piston-cum-slide llb. It is pivotally supported to swing around a support shaft 11c in accordance with the operation. One end of the slide llb (on the side opposite to the piston) is connected to the crankshaft 11d, and the rotation of the crankshaft lid driven by an electric motor (not shown) causes the cylinder 1. 1 Slide inside a. This slide Ilb
By sliding the cylinder 1. 1a pressurized oil chamber 11e and pullback oil chamber 1 1. Discharge and inhale a fixed amount of hydraulic oil f.

A pair of press cylinders are arranged facing each other to form one press cylinder pair 1.2.13, and another pair of press cylinders are similarly arranged facing each other to form the other press cylinder pair 14.15. .

Next, with reference to FIG. 3, FIG. 4, or FIG. 5,
In this embodiment, these press cylinder pairs 12, 1.3
Oyohi]. 4.15 are arranged orthogonally in the horizontal or vertical plane.

7 It should be noted that the number of pairs of press cylinders does not necessarily have to be two, and three or more pairs of press cylinders can be used to form the object 10.
and in any angular direction.

For each press cylinder pair 12.13 and 14.15 there is a corresponding first and second synchronous cylinder 16.
17 are provided. Each synchronous cylinder 1.6.17 has a pressurized oil chamber 18, 1.9 with the same cross-sectional area on one side of the piston 35.36, and
, 17 on the pressurizing side of the piston and both pressurizing oil chambers 18, 1
Each boat 2021.22 is provided at the end of the 9 side.

Furthermore, as will be described later, the pressurized oil chamber 1]-e of the power generator 11 is communicated with the piston pressurizing side of each synchronous cylinder 16, 17 via the pressurizing pipe 23, and Oil chamber 1. 1 f to each press cylinder 12.13 and 14.1 through a return line 24.
It communicates with the slide retraction side of No. 15. Further, the pressurized oil chambers 18, 1.9 of each synchronous cylinder 1.6.17 communicate with the press slide pressurizing side of the press cylinder pairs 12.13 and 14.15 through the respective bows 21.22. has been done.

A selection valve device 25 is provided in the middle of the pressurizing pipe 23 from the power generator 11 to the first and second synchronous cylinders 16.17 to sequentially and selectively switch the operation of these synchronous cylinders 16, 1.7. ing. The pressurizing pipe 23 branches midway into a first branch pipe 23a connected to the first synchronous cylinder 16 and second branch pipes 23b and 23b' connected to the second synchronous cylinder 17.

The selection valve device 25 of the embodiment of FIG.
A pilot check valve 26 interposed in a, a switching valve 27 provided in the second pipe line 23b, and each of these valves 26
．． solenoid valves SVI, SV2 for 27 and the solenoid valve S
It has a pilot oil pressure source 28 that enables operation of a pilot check valve 26 and a switching valve 27 via VI and SV2.

Note that the pipe line 23 branched from the branch pipe line 23a in FIG.
A' is a relief valve 2 that prevents transient loads during switching.
is provided. And the pipe line 23a' and the pipe line 23b
' is connected to the pipe line. The switching valve 27 is a solenoid valve SV2
is set to be closed when off.

On the other hand, a preload pressure is constantly applied to the pullback pipe 24 by the accumulator 30, and the slides of each pair of press cylinders are thereby always pressed toward the pullback side. 31 is an auxiliary hydraulic pump for preloading connected to the pullback pipe 24.

In this structure, the workpiece 10 is first carried into the lower mold 9 by a transport device (not shown), and then the upper mold 8 is lowered and the workpiece 10 is transferred to the lower mold 9.
0 is closed by clamping with upper and lower molds 8.10. Thereafter, the pressure oil discharged from the power generator 11 with both the solenoid valves SVI and SV2 turned off is guided to the first synchronous cylinder 16 via the pilot check valve 26, and from the first press cylinder pair 12
．． 13.

Therefore, in the case of FIG. 3, the forming punches 1 and 2 attached to the tips of first press cylinders 12 and 13 facing each other are operated synchronously in the X direction of FIG. 3 by pressurized oil.

Therefore, the molded article 10 is molded under pressure by the molding punch 1.2 while being clamped by the upper mold 8 and the lower mold 9. Then, a limiter provided at the cylinder tip of the first press cylinder pair (X-direction press cylinder pair) 1213
When the switch 32 is turned on, the solenoid valve SV2 is turned on (switching valve 27 is opened), and the pressurized oil in the pressurizing pipe 23 passes through the switching valve 27 to operate the second synchronous cylinder 17.

Therefore, the forming punches 34 attached to the tips of the second pair of press cylinders 14, 15 operate, and synchronous forming in the Y direction in FIG. 3 is performed. At this time, if the pressurizing pressure in the X direction decreases, pressure oil is introduced from the pipe line 23 to the first synchronous cylinder 16 via the pilot check valve 26,
The press cylinder pair l213 in the X direction is pressurized again.

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

At this time, since the switching valve 27 is open, the second
The pressure oil on the pressure side of the press cylinder pair (Y direction press = 11 cylinder pair) 14.15 (punch 3, 4), that is, the pressure oil on the piston pressure side of the second synchronous cylinder 17, The oil is returned to the pressurized oil chamber 11e.

When the slide 11-b of the power generator 11 reaches the bottom dead center, the solenoid valve S1 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 The pressurized oil on the press cylinder pair 12 , 13 side, that is, the pressurized oil on the piston pressurizing side of the first synchronous cylinder 16 , is similarly returned to the power generator 11 from the pressurizing line 23 .

Next, the first and second press cylinder pair 12.13.14
', 1.5 is completed, the process of pulling back the upper mold 8 begins. When the upper mold 8 is pulled back to the upper limit, the pulling back operation ends and one cycle of the cutting operation ends.

FIG. 4 shows an example in which opposing molds 5 and 6 and forming punches 3 and 4 are arranged orthogonally in a vertical plane, and the molds 5 and 6 clamp the object 10 and shape the outer shape. Forming punch 3,
Drill holes on the end face in Step 4. This is an example in which the molds 5, 6 and the forming punches 3, 4 are respectively attached to the tips of the press cylinders 1-2 as in Fig. 3, and in the example shown in Fig. 3, the first cylinder pair 12, 13 and The difference is that the second pair of cylinders 1.4.15 operate so as to intersect in the horizontal direction, whereas the example shown in Fig. 4 operates so as to intersect in the vertical direction; are the same. Furthermore, in the example shown in FIG. 4, the cylinder pair shown in FIG. 1 also functions as a mold clamping cylinder, so that the mold clamping cylinder can be omitted.

In the example shown in FIGS. 5(a) and 5(b), a protruding portion (hereinafter referred to as a protruding portion) such as a collar or flange portion (hereinafter referred to as a protruding portion) 1 is attached to a molded product.
This is an example of molding a product in which a protrusion 10' is formed on the object 10.
.

In the case of FIGS. 5(a) and 5(b), the material near the protrusion 10' (to be formed) is pushed up toward the protrusion 10' by the later operated hollow punch, and the material is pushed up toward the protrusion 10'. Materials flow reliably into the pipes to produce high-quality products.

FIG. 6 is a one-hour diagram of the mold/punch stroke of the device of the present invention, showing the above-mentioned upper mold 8 and forming punches 1, 2, 3.4.
It is a diagram illustrating the stroke operation of (pair of press cylinders 12, 13, 14, 15) over time.

First, the upper mold 8 descends and contacts the lower mold 9, and the upper and lower molds 8
, 9 are clamped, and the periphery of the object to be molded ]O is closed. At the same time as the closing is completed, the forming punch 1.2 on the X direction side starts the forming operation.

When the forming operations of the forming punches 1 and 2 are completed, the forming punches 3 and 4 on the Y direction side start forming operations. Forming punch 3,
When the forming operation of 4 is completed, the forming punches 3, 4 and the forming punch 12 both enter a retracting operation, and all the forming punches 1, 2, 3.4 are pulled back.

When the retracting operation of the forming punches 1.2, 3.4 is completed, the upper mold 8 is raised to open the mold, and when the upper mold 8 reaches its upper limit, one cycle is completed.

FIG. 2 is a circuit diagram showing another embodiment of the selection valve system W25 of the present invention.

The selection valve device 25 of this embodiment is the X-direction press cylinder pair 12.13 or the Y-direction press cylinder pair 14.
．． This allows any of the 15 to be activated first. In the first pipe line 23a branched from the pressurized pipe line 23,
In addition to the pilot check valve 26, a second switching valve 3
3 and a second switching valve solenoid valve SV3 are provided, and in addition to the switching valve 27 of the first embodiment, a second switching valve SV3 is provided in the second pipe line 23b.
A pilot check valve 34 and a second pilot check valve solenoid valve SV4 are provided.

For example, when operating the X-direction press cylinder pair 12.13 first, the second switching valve 33 added as described above and the second pilot valve 1 to check valve 34 are kept open at all times, and the switching valve 27 and the pilot check valve 26 is operated as described above.

Conversely, when operating the Y-direction press cylinder pair 14.15 first, the switching valve 27 and the pilot check valve 2
6 is kept open at all times, and the second switching valve 33 and second pilot check valve 34 are opened and closed by signal commands. When the press cylinder pair is opened, both the X and Y directions are opened at the same time.

In each of the above-mentioned embodiments, a four-axis press is shown in which pairs of press cylinders are provided in two directions (X and Y), but one of the press cylinder pairs can be removed to create a three-axis press. Of course, a plurality of pairs may be provided around the object to be molded.

[Effects of the Invention] As explained above, according to the present invention, the advantages of mechanical and hydraulic presses are utilized by using a mechanical constant discharge type hydraulic pressure generator, which is a hydromechanical drive device, as a drive source.
Molding can be performed simultaneously or in a predetermined order from any direction at high speed and with high precision. In addition, various types of machining such as flat punching and hole punching are possible, thereby improving product yield and reducing machining allowances in subsequent machining processes.

In addition, for products with protrusions, punching the side with the protrusions first allows for the production of high-quality products.

[Brief explanation of drawings]

1 6 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 for horizontal four-way forming. FIG. 4 is a partial and schematic perspective view showing the direction of forming operation of the cylinder slide; FIG. 4 is a schematic view showing the direction of operation of the press cylinder slide in the case of vertical four-way forming. , FIGS. 5(a) and 5(b) are schematic diagrams showing the forming operation of a product with flaps, and FIG. 6 is a one-hour diagram of the mold/punch stroke of the present invention. 10... Object to be formed 11... Crank-type constant discharge type hydraulic pressure generator (power generator) 12.13... X-direction press cylinder pair 14.15.
...Y direction press cylinder pair 16.17...Synchronized cylinder 18.19...Pressure oil chamber 23...Pressure pipe 23a 23b, 23a', 23b' - = Branch pipe 24...Pull Return pipe line 25... selection valve device 2
6 34... Check valve to pilot 1 27.33...
Switching valves SVI to SV4... Solenoid valves Figure 3 Figure 5 Figure 4

Claims (1)

[Scope of Claims] 1) After closing the periphery of the molded object by clamping the mold of a multi-axis molding device having forming punches arranged to move forward and backward relative to the molded object from a plurality of directions, A forming punch in one direction is actuated by pressure oil from a mechanical hydraulic pressure generating device to perform punch processing, and then forming punches in at least one other direction are sequentially actuated by pressurized oil from the mechanical hydraulic pressure generating device. A method for molding a molded product using a multi-axis molding device, characterized in that the molded product is formed by punching in multiple directions within one cycle of a mechanical hydraulic pressure generating device. . 2) A method for molding a molded product using a multi-axis molding apparatus according to claim 1, characterized in that when the molded product has a protrusion, the side having the protrusion is punch-formed first. 3) A multi-axis forming device having forming punches arranged to move forward and backward relative to the object to be formed from a plurality of directions, including a plurality of press cylinders for moving the forming punches forward and backward, one press cylinder for each press cylinder, and a plurality of synchronous cylinders communicating with the slide pressurizing side of the press cylinder, and a slide retracting side of the press cylinder connected to the piston pressurizing side of the synchronous cylinder via a pressurizing conduit and via a pullback conduit. a mechanical hydraulic pressure generator connected to the
A multi-axis molding apparatus characterized by comprising a valve device provided in the pressurizing pipeline and selectively operating the plurality of synchronous cylinders.