JP2010149137A - Sequential forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sequential forming apparatus which is the one for forming a thin metal plate, wherein the thin metal plate is formed in a short time without any shrinkage at a corner part of large deformation, the cost is reduced, and the structure is simple and energy required for the forming is reduced. <P>SOLUTION: In the sequential forming apparatus 1, a blank 30 is set on an upper surface of a lower die 10 having a forming die part 11, and the blank is pressed against the upper surface of the lower die by a clamper 2. Oil filled in an oil pool 6 formed of the blank and the forming die part is sucked by a decompression pump 4 via a piping system 20, the pressure in the oil pool is reduced to execute the decompression forming of the entire blank, and the upper surface of the blank is pressed by a bar tool 2 so as to follow the contour of the forming die for perform the sequential forming, and the blank is formed in a predetermined shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sequential forming apparatus for forming a thin metal plate.

  As a sequential forming device for forming a metal sheet of the prior art, a die punch having a forming shape is pushed from the thickness direction to a predetermined height while holding the edge of the blank, and the die punch is pushed in. With the wrinkle presser force increased and the material flow locked, shape shaping is performed with a tool from the opposite side across the die punch and the plate thickness. After this, the wrinkle presser force is reduced and the die punch is set to the required height again. A thin plate forming apparatus is disclosed in which the drawing step is performed by raising and then the step of forming the shape with a tool in a state in which the wrinkle pressing force is increased and the material flow is locked is repeated one or more times (for example, Patent Document 1). reference.).

  Also, a manufacturing apparatus for manufacturing a mask jig by softening a synthetic resin workpiece and then setting the mold on a mold and evacuating the mold, and at least a part corresponding to the parting line of the mask jig Is provided with a porous member for forming an acute angle portion in a portion corresponding to the parting line of the mask jig, in the suction hole or slit. An apparatus for manufacturing a mask jig provided with a plug capable of pressing the periphery of a sheet portion corresponding to a parting line from the front side of the sheet toward a forming die is disclosed (for example, see Patent Document 2).

In addition, the material is fixed to the seat arranged inside the female mold, the material is arranged between the female mold and the tool, and between the seat and the tool, and the outer end portion of the material is drawn by drawing. Is formed in such a manner that the seat and the tool are moved in the drawing direction relative to the female mold while the tool is movable in the drawing direction, and the tool is moved relatively along the inner peripheral surface of the female mold. Is disclosed (for example, see Patent Document 3).
JP 2006-341262 A JP 2008-149462 A JP 2002-1444 A

  However, according to Patent Document 1, there is a problem that the processing time becomes long because molding is performed while repeatedly increasing and decreasing the pressing force of the blank material to the mold punch, and the height is increased because the mold punch is again raised by the required height. There is a problem that a control device is required and the device becomes complicated.

  Further, according to Patent Document 2, there is a problem that a heating device is required in addition to a vacuum device in order to soften the synthetic resin, resulting in a high device cost and a problem of requiring an energy cost for heating. In addition, since a vacuum state is partially created, it is necessary to process the portion close to the outer periphery of the workpiece in a separate process, which increases the processing time.

  According to Patent Document 3, a vacuum suction pad is provided on the upper surface of the seat, and the material is fixed by vacuum suction. However, the vacuum suction force is not actively used for the molding process, and the material is shaped like a rod. Since the tool is successively moved along the inner peripheral surface of the female mold, the processing time is increased.

  The present invention has been made in view of the above problems, and is a forming apparatus for forming a thin metal plate, which is free from shrinkage at a corner with a large amount of deformation, can be formed in a short time, and is low in cost. An object of the present invention is to provide a sequential forming apparatus having a simple structure and low energy required for processing.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes: a lower mold having a mold part that molds a work into a predetermined shape; a clamper that presses the work set in the lower mold; and a work pressed by the clamper. A rod tool that is pressed and molded, a piping system that is provided in the lower mold and connected to a hole communicating with a liquid reservoir formed by a work and a mold part, and a liquid that is connected to the piping system and filled in the liquid reservoir A pressure reducing means for reducing the pressure of the liquid reservoir by suction to form a workpiece, an operation timing of the pressure reducing means and the bar tool, and a control device for controlling the flow of the liquid in the liquid reservoir are provided.

  According to a second aspect of the present invention, the hole is provided at least in a liquid reservoir system having a bottom in which the liquid is stored in the liquid reservoir.

  In the invention according to claim 3, the control device controls the flow rate of the liquid sucked by the decompression means.

  According to a fourth aspect of the present invention, the piping system includes a flow meter and a valve arranged in series in communication with a hole provided at the bottom for each liquid storage system, and is sucked from the liquid storage system by the control device. The liquid flow rate is controlled for each liquid storage system.

  The successive forming apparatus of the present invention sucks the liquid in the liquid reservoir by a decompression means such as a decompression pump, and depressurizes the liquid reservoir, and forms the entire workpiece in a short time with the pressure difference between the atmospheric pressure and the liquid reservoir. Then, the workpiece is pressed so as to follow the forming die portion with a bar tool to improve the material flow, and the formation of the shrinkage at the corner portion having a large deformation amount is prevented, and then the forming is performed. In addition, the density of the gas changes greatly depending on the pressure, but the liquid hardly changes, so filling the liquid in the liquid reservoir and reducing the pressure makes the amount of liquid in the liquid reservoir simpler than gas, It can be controlled appropriately, and the timing of the pressure on the workpiece by the bar tool and the pressure reduction of the liquid reservoir by the pressure reducing means can be adjusted easily and appropriately. As described above, the successive forming apparatus of the present invention can prevent the occurrence of shrinkage at a corner portion having a large deformation amount, and can form a workpiece into a predetermined shape in a shorter time than the prior art.

  In addition, there is no need for a height control device that raises the mold punch required in the prior art by the required height, or a heating device that heats the workpiece made of synthetic resin, and the clamper presses and clamps the workpiece from above, Since the pressure is reduced by the pressure reducing means and is adsorbed and fixed on the upper surface of the lower mold, a low-cost and simple structure can be provided, and a successive molding apparatus that requires less energy for processing can be provided.

  Further, in the present invention, the hole through which the liquid in the liquid reservoir sucked by the pressure reducing means passes is provided at the bottom in the molding die portion which is the lowest position where the liquid is stored. As a result, air suction of the pressure reducing means is prevented and the pressure reducing means operates properly without failure, so that the amount of liquid in the liquid reservoir can be properly controlled. Further, since the hole is prevented from being blocked by the workpiece in the middle of molding, the liquid in the liquid reservoir system can be suitably sucked by the pressure reducing means until the molding is completed. As described above, it is possible to provide a successive molding apparatus that can prevent the occurrence of shrinkage and that can be molded into a predetermined shape in a short time.

  Further, the amount of liquid in the liquid reservoir can be appropriately controlled by controlling the flow rate of the liquid sucked into the liquid reservoir by the decompression means. Thereby, the timing of the pressure by the bar tool and the pressure reducing means by the pressure reducing means can be adjusted appropriately, the occurrence of the shrinkage at the corner portion having a large deformation amount can be prevented, and the successive forming apparatus for forming into a predetermined shape in a short time can be provided.

  Further, the flow rate of the liquid sucked in the liquid reservoir by the pressure reducing means is controlled based on the measurement signal of the flow meter, and the flow rate of sucking the liquid of the pressure reducing means (for example, a pressure reducing pump) and the flow path opening of the valve are controlled. Thus, the amount of liquid in each liquid reservoir system can be individually controlled. Therefore, in each liquid reservoir system, the pressure by the bar tool and the timing of pressure reduction by the pressure reducing means are appropriately adjusted, and it is possible to prevent the occurrence of shrinkage at the corner with a large deformation amount and to form into a predetermined shape in a short time. A sequential molding apparatus can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2 are explanatory views of a sequential forming apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the sequential forming apparatus according to an embodiment of the present invention, and FIG. It is AA sectional drawing. As shown in FIG. 1, the successive forming apparatus 1 includes a lower mold 10, a clamper 2, a bar tool 3, a piping system 20, a decompression pump 4 (decompression unit), and a control device 5. . The lower mold 10 is provided with a mold part 11 in which a blank material 30 (workpiece) is molded into a predetermined shape. Further, an O-ring groove 14 in which an O-ring 7 is mounted is provided on the upper surface of the lower mold 10, and a thin metal sheet such as a thin cold-rolled steel sheet (for example, a thickness of 1 mm or less) is interposed through the O-ring 7. The blank material 30 is set on the upper surface of the lower mold 10, and in this state, the blank material 30 is pressed against and clamped by the upper surface of the lower mold 10.

  A liquid reservoir 6 having a substantially W-shaped cross section and a substantially rectangular plane (FIG. 2) viewed from above in FIG. 1 is formed by the molding die 11 and the blank member 30. The liquid reservoir 6 has a bottom 12a in which oil (liquid) is accumulated. And 12b, respectively, are provided (FIGS. 1 and 3). The bottoms 12a and 12b are located at the lowest positions of the liquid reservoir systems 6a and 6b, and holes 13a and 13b connected to the piping system 20 are provided. Note that the volume of the liquid reservoir systems 6a and 6b varies depending on the state of the molding process.

  In this embodiment, the oil in the liquid reservoir 6 is sucked from the two systems of the holes 13a and 13b at the positions of the bottoms 12a and 12b, but may be sucked from one system or three systems or more. In addition to the bottoms 12a and 12b, a hole communicating with the piping system 20 (for example, a hole communicating with the piping system 20 in any one of the inclined portions 11a to 11f) is provided on the surface of the mold part 11, and suction is performed from there. good.

  The piping system 20 includes flow meters 22a and 22b, valves 24a and 24b, and piping 21a, 21b, 23a, 23b, 25a, 25b, and 26. The hole 13a is sequentially connected to the pipe 21a, the flow meter 22a, the pipe 23a, the valve 24a, and the pipe 25a. Similarly, the hole 13b is sequentially connected to a pipe 21b, a flow meter 22b, a pipe 23b, a valve 24b, and a pipe 25b. The decompression pump 4 is connected to the pipe 25a and the pipe 25b via the pipe 26.

  The liquid reservoir 6 is not limited to oil but may be any liquid, and preferably oil that provides rust prevention and lubrication effects. Moreover, by using liquid, the sealing performance of the connection part of O-ring 7 and the piping system 20 improves compared with gas, and the penetration | invasion of the air from the circumference | surroundings is prevented.

  The flow meters 22 a and 22 b are provided for measuring the flow rate of oil sucked by the decompression pump 4 from the liquid reservoir systems 6 a and 6 b, and a flow rate measurement signal is transmitted to the control device 5. Based on this measurement signal, the controller 5 controls the decompression pump 4 and the valves 24a and 24b, and adjusts the oil amounts of the liquid reservoir 6 and the reservoir portions 6a and 6b, respectively.

  Next, the operation and effect of the successive molding apparatus 1 will be described.

  FIG. 3 is an explanatory diagram illustrating a process of forming the blank material 30 into a predetermined shape using the successive forming apparatus 1. As shown in FIG. 3, the blank material 30 is formed by sequentially performing the following five steps.

  (Step 1) As shown in FIG. 3A, the blank material 30 is set on the upper surface of the lower mold 10 filled with oil, and then the clamper 2 descends from above and comes into contact with the upper surface of the blank material 30. The blank material 30 is pressed against the upper surface of the lower mold 10 with a predetermined pressing load.

  (Step 2) As shown in FIG. 3 (b), when step 1 is completed, molding is started. That is, the vacuum pump 4 (FIG. 1) is operated, the liquid reservoir 6 is depressurized, and the blank material 30 is adsorbed and fixed to the upper surface of the lower mold 10, and then the entire blank material 30 is vacuum-formed and the bar tool 3 is Sequential molding is performed along the mold part 11. The operation of the decompression pump 4 (FIG. 1) is to suck the oil in the liquid reservoir 6 through the holes 13a and 13b with the passages of the valves 24a and 24b being properly opened by the decompression pump 4 (FIG. 1). The pressure of the liquid reservoir 6 is made lower than the atmospheric pressure. At this time, the blank material 30 as a whole is gradually formed so as to follow the contour of the mold 11 by the pressure difference between the generated atmosphere and the liquid reservoir 6. The bar tool 3 descends from above and comes into contact with the blank member 30, presses the blank member 30 along the inclined portions 11 a to 11 f (FIG. 2) of the mold 11 and sends the material downward. Sequential molding is performed while preventing local shrinkage of the bottom corners 30a to 30d (FIG. 3D) of the blank 30. Then, the flow rate of oil sucked by the vacuum pump 4 is controlled, the amount of liquid in the liquid reservoir 6 is controlled appropriately, and the timing of the pressing by the bar tool 3 and the pressure reduction by the pressure reducing means 4 is suitably adjusted, and the blank 30 Molding is performed.

  It should be noted that the decompression molding by the decompression pump 4 and the subsequent molding by the bar tool 3 are performed simultaneously, the decompression molding is performed first, then the subsequent molding, the sequential molding is performed first, and then the decompression molding is performed. The blank material 30 is molded in any of the above cases where the molding can be suitably performed according to the thickness, area, molding shape, and capability of the successive molding apparatus 1.

  (Step 3) Processing As shown in FIG. 3C, the rod tool 3 accelerates the material flow to prevent the occurrence of shrinkage, and the unmolded portion is sequentially formed. In this case, whether or not the decompression pump 4 can be operated is selected in accordance with the thickness and size of the blank material 30, the molding shape, and the ability of the successive molding apparatus 1.

  (Step 4) As shown in FIG. 3 (d), bottom corners 30a to 30f (FIG. 2) having a large deformation amount, which are difficult to be formed by reduced pressure molding, are successively formed and finished. In this case, whether or not the decompression pump 4 can be operated is selected according to the thickness, area, molding shape, and capability of the successive molding apparatus 1 of the blank member 30.

  (Step 5) As shown in FIG. 3 (e), when step 4 is completed, a product 31 formed into a predetermined shape from the blank 30 is completed, the vacuum pump 4 is stopped, and the bar tool 3 and the clamper 2 are It returns to the position before the blank material 30 is set. And the product 31 is taken out from the lower mold | type 10, and 1 shot of the shaping | molding process of the blank material 30 is complete | finished.

  The flow rate at which the oil in the liquid reservoir 6 is sucked by the decompression pump 4 is controlled according to the plate thickness, area, molding shape, and capacity of the subsequent molding apparatus 1 of the blank material 30. This flow rate control is performed by transmitting the measurement signals of the flow meters 22a and 22b to the control device 5, and adjusting the flow rate of the decompression pump 4 and the flow passage openings of the valves 24a and 24b appropriately by the control device 5. Is called.

  According to the above, the oil in the liquid reservoir 6 is sucked by the vacuum pump 4 and the liquid reservoir 6 is depressurized, and the entire blank material 30 is formed under reduced pressure in a short time by the differential pressure between the atmospheric pressure and the liquid reservoir 6. 3, the molding is performed sequentially so as to follow the contour of the mold part 11, and the flow of the material is improved to prevent the occurrence of shrinkage at the bottom corners 30a to 30d having a large deformation amount.

  Moreover, the density of the gas changes greatly depending on the pressure, but the density of the liquid such as oil hardly changes. Therefore, by filling the reservoir 6 with oil and reducing the pressure, the amount of oil in the reservoir 6 is reduced compared to the gas. Easy and proper control. Thereby, by adjusting the timing of the pressure by the bar tool 3 and the pressure reduction by the pressure reducing pump 4, the successive forming apparatus 1 of the present invention can prevent the occurrence of the shrinkage at the bottom corner portions 30a to 30d having a large deformation amount, In addition, the blank material 30 can be formed into a predetermined shape in a short time compared to the prior art.

  Further, the holes 13a and 13b through which the liquid in the liquid reservoir 6 sucked by the decompression pump 4 passes are provided at the lowest position, that is, at the bottom of the liquid reservoir systems 6a and 6b in which the liquid accumulates. Suction is blocked and the vacuum pump 4 operates properly without failure. Thereby, the oil amount of the liquid reservoir 6 can be appropriately controlled. Further, since the holes 13a and 13b can be prevented from being blocked by the blank material 30 in the middle of molding, the liquid in the liquid reservoir systems 6a and 6b is preferably sucked by the vacuum pump 4 until the molding is completed. As described above, it is possible to provide the successive molding apparatus 1 that can prevent the occurrence of shrinkage and that can be molded into a predetermined shape in a short time.

  Further, the flow rates of the oil sucked from the liquid reservoir systems 6a and 6b by the decompression pump 4 are controlled, so that they are controlled so as to be suitable for forming the liquid reservoir systems 6a and 6b. In this flow control, the measurement signals from the flow meters 22a and 22b are transmitted to the control device 5, and the flow rate of each of the valves 24a and 24b and the flow rate of the decompression pump 4 are controlled by the control device 5 based on the measurement signals. Is properly controlled. Thereby, the oil amount of the liquid reservoir systems 6a and 6b is individually controlled, and the timing of pressing by the bar tool 3 and the pressure reduction by the vacuum pump 4 is adjusted for each of the liquid reservoir systems 6a and 6b. As a result, it is possible to provide the sequential forming apparatus 1 that can prevent the liquid reservoir systems 6a and 6b from being closed and can be molded into a predetermined shape in a short time.

  Further, the successive forming apparatus 1 of the present invention does not require a height control device that raises a mold punch required in the prior art by a required height or a heating device that heats a synthetic resin workpiece. 30 is clamped by pressing from above with the clamper 2 and is adsorbed and fixed to the upper surface of the lower mold by the decompression pump 4, so that the structure is simple, and the subsequent molding apparatus 1 with low apparatus cost and low energy cost for processing is provided. Can be provided.

It is AA sectional drawing of FIG. It is a top view of the sequential shaping | molding apparatus concerning embodiment of this invention. It is explanatory drawing which shows the shaping | molding process of the blank material by the sequential shaping | molding apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Successive forming apparatus 2 Clamper 3 Bar tool 4 Pressure reduction pump (pressure reduction means)
DESCRIPTION OF SYMBOLS 5 Control apparatus 6 Liquid reservoir 6a, 6b Liquid reservoir system 10 Lower mold | type 11 Mold part 12a, 12b Bottom 13a, 13b Hole 20 Piping system 22a, 22b Flowmeter 24a, 24b Valve 30 Blank material (workpiece)

Claims (4)

A lower mold having a mold part for forming a workpiece into a predetermined shape;
A clamper that presses the workpiece set in the lower mold;
A bar tool for pressing and molding the workpiece pressed by the clamper;
A piping system connected to a hole provided in the lower mold and communicated with a liquid reservoir formed by the work and the mold part;
A pressure reducing means connected to the piping system, for sucking a liquid filled in the liquid reservoir and depressurizing the liquid reservoir to form the workpiece;
A sequential forming apparatus comprising: an operation timing of the pressure reducing means and the bar tool; and a control device that controls the entry and exit of the liquid in the liquid reservoir. The said shaping | molding apparatus of Claim 1 characterized by the above-mentioned. The said hole is provided at least in the liquid reservoir system which has the bottom where the said liquid accumulates in the said liquid reservoir. The said shaping | molding apparatus controls the flow volume of the said liquid attracted | sucked by the said pressure reduction means, The sequential shaping | molding apparatus as described in any one of Claim 1 or 2 characterized by the above-mentioned. The piping system includes a flow meter and a valve arranged in series in communication with the hole provided in the bottom for each liquid storage system, and the flow rate of the liquid sucked from the liquid storage system by the control device The sequential molding apparatus according to claim 2, wherein the control is controlled for each of the liquid storage systems.

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