KR100237517B1 - Hydroelastic deep drawing device - Google Patents

Abstract

It is an improvement of the fluid drawing deep drawing apparatus so that the advantage and effect of a rubber elastic cushioning mechanism can be acquired.

A hydraulic single stroke piston with a drawing pin that can be inserted into the cushion plate is installed while a cushion plate having a multi-point support and control mechanism corresponding to the geometric shape of the workpiece is installed. One single-stroke cylinder each having a hydraulic force action separation zone is assigned, and cushion plates are hydraulically supported at four outer corners by one differential cylinder piston mechanism, and are based on appropriate control. By the multi-point position adjustment of the differential cylinder piston mechanism, the eccentric force when the center of the surface of the force in the action division region of the force changes is absorbed by the hydraulic pressure itself.

Description

Fluid elastic deep drawing device

1 is a schematic view of a deep drawing apparatus according to the present invention.

2 is a cross-sectional view of the cushion plate according to FIG. 1.

3 shows a deep drawing apparatus of another embodiment according to the invention in which the press is shown in a closed state.

4 shows a table plate with a hole pattern according to FIG.

5 shows a third embodiment of a deep drawing apparatus;

6 shows a table plate with a hole pattern according to FIG.

7 shows a fourth embodiment of a deep drawing apparatus according to the present invention;

FIG. 8 shows a table plate with a hole pattern according to FIG. 7.

FIG. 9 shows a fifth embodiment of a deep drawing apparatus having a single stroke piston disposed in a centering position on a table plate.

FIG. 10 shows a sixth embodiment of a deep drawing device having a single stroke piston disposed in a centering position on a table plate.

11 is a plan view of the table plate according to FIG.

FIG. 12 is a diagram showing a deep drawing device according to FIGS. 10 and 11 when used as a double press.

13 shows a plan view of the table plate according to FIG.

* Explanation of symbols for main parts of the drawings

1: press 2: ram

3, 14: differential cylinder piston system (adjustment member)

4: dice 5: punch

6: table plate 8: cushion plate

10, 23: single stroke piston 12: sheet holding plate

16: screw coupling member 17: return spring

21, 22: action area of force 24: mounting plate

31: cushion 33: opposing cylinder

This invention relates to the fluid elastic deep drawing apparatus of the press for drawing-processing thin plate molded parts of the format described by the high concept of Claim 1.

In the case of metal deformation for manufacturing thin-walled molded parts that are deep-drawn, in the tool technology system, it is known to use a drawing pin to support a thin plate holding plate. This drawing pin acts as a spacer pin to form a pressing pin between the sheet holding plate and the cushion. The drawing pins are the main constituents of the requirements of each deep drawing tool, ie the length and number of drawing pins are due to the tool.

The drawback of this mechanical drawing pin is that an uneven thin plate holding force is generated uncontrollably during operation in the case of a rigid clamping mechanism, which leads to an unsuitable crease in the molded part. This drawback is avoided by the elastic clamping member by inserting a rubber plate therebetween.

In the specification of the Federal Republic of Germany Patent No. 3022844, a die drawing device of a press or a die is already known for drawing a thin sheet molded part, and the deep drawing device includes a plurality of pressure cylinders for supporting a sheet holding plate, A cushion comprising a piston loaded by a flow pressure medium movably guided axially in the pressure cylinder, and having a separate cushion for receiving the punch movably guided in the drawing direction. The pressure cylinder is connected by a flow pressure medium pushed out of the pressure cylinder during the drawing process while being connected to the pressure cylinder of the cushion used as the support for the thin plate holder through the flow path.

In the case of this deep drawing apparatus, a pressure cushion flowing out from a pressure cylinder of a cushion used as a support for a thin plate holder in the lowering of a die operated by a press ram, has a separate cushion for receiving the punch in a vertical direction. It is important to let the pressure cylinder of the cylinder flow through the conduit and load the piston guided in the pressure cylinder of the cushion, in which case the piston itself resists the punch in the direction of movement of the die and sheet holding plate during the drawing process. Drive in the drawing direction. The direct flow connection between the pressure cylinder of the punching action division and the pressure cylinder of the sheet holding plate and the operation separation obtained thereby forms a so-called pressure balance.

One of the drawbacks of mechanical drawing pins has been avoided by this known deep drawing apparatus.

The following are mentioned as a fault of this well-known deep drawing apparatus.

The force generated cannot be reproduced. This is because the relationship between the drawing processing speeds based on different flow resistances arises, that is, this deep drawing apparatus is not suitable for carrying out the process through a computer program.

The force progression during sheet deformation is usually parabolic from the beginning to the end of the deep drawing process. Especially in the case of flat drawing parts, or in the case of complex molded parts and geometric shapes, it is necessary to control the high sheet holding force in the range of the special working area of the sheet holding range as desired from the beginning.

In order to avoid this drawback, in the specification of the Federal Republic of Germany Patent Application No. 3333687, a pressure control valve is housed together, whereby the flow of oil flows between the sheet holding member and the punch through the pressure control valve. In the section, different pressures can be adjusted, for example, from the outset or basically throughout the entire drawing process.

In this case, the following drawbacks actually arise with respect to this control:

(A) The oil is compressed differently at different pressures in the action separation zone, thin plate holder and action separation punch; this results in a hydraulic pressure peak, which further destroys the lubricating film surface structure. Become together.

B) Pressure control valve causes leakage oil and consumption.

C) On the basis of the conditions a) and c), reproducible processes or production progress cannot be obtained, i.e., precisely not carried out.

The flow connection in the two known examples usually causes a drawback that the punch stroke position cannot be accurately and reproducibly controlled on the basis of oil compressibility and leakage.

In order to avoid the drawbacks of rigid clamping mechanisms, according to the specification of German Federal Patent No. 3324705, the cylinders are supported four-point while supporting force on the dies individually to compensate for the inclined position and at least at the corners. Cushion mechanisms are known in which force is controlled irrespective of each time. However, when it is inadequate, the kinetic motion cannot be obtained at the return of the mechanism, for example, at the discharge position, without compensating the warp in the cushion plate between the working points of these (1-4) forces.

In order to avoid this drawback, European Patent No. 0268894 and German Federal Patent No. 3807683 also describe the combination of a plurality of arranged hydraulic or pneumatic support cylinders for sheet holding plates, more centrally through a mechanical crosshead. It is known to control the cross head by individual central hydraulic support members for a more synchronous movement function.

The drawback of such a mechanism is that in the case of central adjustment, for example when releasing a workpiece, the tilting motion is generated based on the action of the eccentric force while the mechanical cost increases. It is only limited by the cost of mechanical guides.

The object of the present invention is to avoid the drawbacks and to utilize the drawing pins corresponding to the geometry of the workpiece and arranged according to the hole pattern for the thin plate holding plate, the action separation zone and the punching action separation zone, without any disturbance amplitude. In order to improve the force profile and adjustment, in this case, to improve the fluid-elastic deep drawing device of the above-described form, which is process-accurately assisted by a computer, so that the advantages and actions of the rubber-elastic cushion mechanism can be obtained. Is in.

According to the present invention, the above problems are solved by the configuration described in the characterizing part of claim 1.

With the configuration of the present invention, in particular, with the advantages and possibilities of computer-assisted process control, it is possible to obtain the advantage of the behavior of the rubber-elastic sheet holder / cushion mechanism for distinguishing a plurality of actions of the sheet holding plate and the punch. .

In the present invention, it is not necessary to provide a valve that is individually controlled in each cylinder, and a plurality of hydraulic cylinders are assisted by a computer while being processally accurate in a very narrow space, that is, in the same program In the same case, it can be operated repeatedly.

The hydraulic multipoint support and deep drawing device according to the present invention in combination with a single stroke, a multi cylinder and a mechanism is advantageously a hydraulic and mechanical (crank) deep drawing. It can be used in the apparatus.

Other advantages are as follows.

1) Since each mechanical drawing pin is supported by a hydraulic cushion in the range of the force action division area, it is possible to die by the effect of the rubber elastic cushion and the effect of the uniform force circulating the die. The nonplanarity of is automatically compensated for.

2) At the same time, it is technically possible to apply pressure uniformly at all times and automatically compensate for the inclination corresponding to the angle α due to, for example, the inclination of the cushion plate or the inclination of the ram.

3) Starting from a pattern dimension of German Industrial Standard (DIN) = 150 mm, this pattern dimension can be chosen very small, for example, devider 3 = a = b = 37.5 mm and below. In effect the action of a rubber-elastic mechanism is obtained.

4) The single stroke piston is integrated in the so-called force division of action with the perforation or tubular part in the centering position in the cushion plate itself. In this case, the arrangement of the action separation zone of the force on the lower side of the cushion plate can be arbitrarily selected by the use of an external hydraulic force action separation zone block with respect to the flexible hose, and the arrangement form is applied to the die geometry and the tool. Correspondingly required, the hose for each single stroke piston can be releasably arranged in the cushion plate itself.

5) The individual single stroke pistons can be integrated in the mounting plate up to the pattern spacings a and b, in which case the mounting plate is divided into large pattern divisions over all cushioning surfaces. The attachment plate is fixed to the cushion plate in form = fit through the screw connecting member. Since the return spring is assigned to each single stroke piston, the mechanical zero position is always obtained on the cushion support surface of the cushion plate.

6) The single stroke piston itself may be provided with an additional centering member, for example to center the mechanical drawing pin.

7) Force action division is servo-hydraulic over the drawing stroke, taking into account precise force profile control.

8) In the case where an eccentric force distribution occurs in the cushion plate due to the action of different forces, the cushioning plate is inclined, that is, the angle α at each limit position is determined by the cushion plate. It is enlarged when it is supported at the center through the cylinder, which is the central hydraulic pressure, or decreased when the cushion plate is not sufficiently mechanically guided while the cylinder is hydraulically connected in multipoint support. do.

The differential cylinder piston device acting at the four corners of the cushion plate enables synchronous operation control between the cushion plate and the sheet holding plate in both passive and active drawing processing, and all four cylinders are deep drawing strokes. As it is adjusted by servohydraulic operation by synchronous operation (parallel operation), during synchronous operation, the mechanism is submerged under pressure to compensate for the oil compression ratio error extensively.

Each stroke position is adjusted and controlled in accordance with the tool request, and a parallel return of the sheet holding plate is obtained after the deep drawing process. In this case, a return stroke can be performed at high speed according to the speed profile (acceleration and braking) which can be preprogrammed in order to mold-release a part which was drawn.

In this case, advantageously, the single stroke cylinder piston device automatically compensates for a misalignment during synchronous operation. More advantageously, the single stroke cylinder piston device is servo-hydraulically controlled for rapid movement with low oil volume and high precision at low cost and virtually no compression volume.

The deep drawing apparatus according to the present invention can be used in this fluid type deep drawing apparatus without modifying an existing tool used for a conventional mechanical drawing pin. Very advantageous and large use spectrum for the use of other method steps, for example, from the normal extrusion, deep drawing processing to the opposite deep drawing processing, with the possibility of very high process precision of hydraulic control being obtained. This becomes possible.

The possibility based on the process precision of the method for controlling the deep drawing process according to the present invention is particularly important for quality assurance of the produced deep drawing workpiece. Interference, for example the inclination of the press ram or the non-parallel of the tool, is effectively compensated by a single stroke, multi-point support mechanism of a given fluid type, whereby the occurrence of wrinkles is prevented by this.

When different forces are controlled for each force action division region, the center of the force plane changes in the cushion plate. This eccentric force acting on the cushion plate is immediately absorbed by the hydraulic pressure itself by the differential cylinder positioned at the four corners.

Other claims also correspond to preferred configurations of the subject matter of the present invention.

The invention is explained in more detail by the following figures.

1 to 13 show various embodiments of the deep drawing apparatus of the press 1, partly in the open working position and partly in the closed working position. A tool change plate having a die 4 is provided on the upper shaft having the ram 2.

In Figs. 1 to 8, a fluid type cushion 31 is shown in a conventionally known structural form, and the cushion 31 is divided into a pattern of the die plate 4 and the table plate 6 which traverses the geometric shape. It has the mechanical drawing pin 13 arrange | positioned inside. The drawing pin 13 is supported by a more common cushion plate 8, in which case the cushion plate 8 is supported by four hydraulic differential cylinder piston mechanisms 3 and 14 (adjustment member). The differential cylinder piston systems 3 and 14 are floatingly coupled to the substrate 9 of the press frame.

In the cushion plate 8, the single stroke piston / cylinder mechanisms 10, 23, 28, 35 of the fluid type are correspondingly provided by the pattern division which has gap size a, b. In this case, the stroke H of the single stroke pistons 10 and 23 is only a few mm, for example a maximum of 10 mm.

Each drawing pin 13 is also supported in the centering recess 34 of the single stroke piston 10 or 23 while being supported by the single stroke piston 10 or 23. The single stroke pistons 10 and 23 are integrated in the action separation zones 21 and 22 of the force for the sheet holding plate 12 or the punch 5, for example. Via 35 is connected to the perforated or tubular portion at the centering position in the cushion plate 8 according to FIGS. 1 and 2.

The flexible hose 25 and the insertion connection member 15 can arbitrarily select the arrangement of the action separation zone of the force on the lower side of the cushion plate 8 via the external action zone of the hydraulic force. The individual single stroke piston / cylinder mechanisms are integrated into the mounting plate 24 corresponding to the pattern intervals a and b, in which case the individual mounting plates 24 are divided into large pattern divisions throughout the cushion surface. The mounting plate 24 is fixed to the cushion plate 8 in shape and connection via the screw coupling member 16.

Since the return spring 17 is assigned to each single stroke piston 10, 23, 28, 35, the mechanical zero position is always obtained on the cushion plate support surface 19 of the cushion plate 8. Either or single stroke pistons 10, 23, 28, 35 are held in neutral center position by return spring 17 for ± compensation.

The cushion plate 8 is hydraulically supported by one cylinder 14 each with four outer corners. All four cylinders are adjusted to fluid elasticity by synchronous operation (parallel operation) during the deep drawing stroke, and in this case, the four cylinders adjusted in parallel are configured as differential pistons 3.

In FIG. 3 and FIG. 4, an embodiment of the change of the multi-point support, single stroke piston cylinder mechanism is shown, in which case the mechanical drawing pins 13 are divided in groups, for example, according to the action division region of the force. It is supported by the large single stroke piston 10, and the single stroke piston is provided with the square support plate 11, respectively.

In FIG. 5 and FIG. 6, the embodiment of a single stroke piston / cylinder mechanism is shown with the large pattern spacing a, b, and in this case, it resists the deep drawing process which is performed downward, for example. An additional opposing cylinder 33 is arranged at the center to act the punch against the passive thin plate holding member in opposing operation.

7 and 8 show a variant embodiment of FIG. 5, with the action separation zones I-VIII of eight forces.

9 shows a multi-point support mechanism having a single stroke piston 9 attached to the table plate 6 at the centering position. The thin plate holding plate 12 of the tool is connected to the table stroke 6 by its own weight in the press-opened state to the table plate 6 and to the single stroke piston returned mechanically to the zero position by the return spring 17. It is stacked.

By the arrangement of the centering position of the multi-point support and the mechanism on the table plate 6, it is possible to use the punch 5 of the single or plural fluid system provided at the centering position below the table plate 6, In the vertical direction, the punch movement from the bottom to the top becomes possible. Therefore, such an arrangement advantageously has the following advantages and enables simple downward stroke and press use.

A) The hardness position, as shown by various angle positions based on the inclination of the ram 2 or cushion plate 8 in FIG. 1, is such that the ram is forcibly supported on the die 4 in the plane. If the ram is configured to work as much as possible, it does not occur.

B) The multi-point support / mechanism 29 may be arranged in the same form in the action division region and pattern interval of the force according to FIG. 1, and similarly, the action division region of various forces using a jack type hose ( 21, 22).

In FIG. 10 and FIG. 11, although the arrangement | positioning form of the centering position of the multipoint support and mechanism similar to FIG. 9 is shown, it is new and different from the following point.

That is, instead of installing a plurality of single stroke pistons with a small pattern spacing a, b similar to that of FIG. 1, in this embodiment, a large single stroke piston unit 10, 11 correspondingly to the action division region of force is provided. It is installed.

FIG. 12 and FIG. 13 show a variation of the arrangement of the single stroke piston arrangement as the multi-point support and mechanism in the upper ram 2 when used as a double press acting from above. In this case, the arrangement of the single stroke piston corresponds to the small pattern interval in FIG. 1 or is divided according to the action division region of the force and is performed by the large single stroke piston 10. Reference numeral 2 'denotes an outer ram.

Note on arrangements with movable cushions: The cushion plate 8 is supported in a liquid manner and is passively moved from top to bottom in the vertical direction by active ram movement. The return of the cushion plate 8 is made upward actively at each arbitrary position. In this case, two positions are obtained in the field where the movement is started by the upward movement.

The upper dead center position indicated by reference numeral 26 in FIG. 3 indicates the top dead center height of the punch 5.

The position above position 26, for example as a discharge station, is indicated by reference numeral 27.

Claims (11)

A fluid resilient deep drawing apparatus for a press for drawing a thin sheet molded part, comprising: a sheet holding plate supported by a hydraulic pressure cylinder through a drawing pin, and a punch guided to be movable in the drawing direction. The punch is supported by at least one piston loadable by a hydraulic medium guided in the cylinder, and furthermore, a hydraulic cushion plate is provided, in which case the mechanical drawing pin is divided into the pattern of the table plate and the die geometry In the fluid-elastic deep drawing apparatus, which is arranged correspondingly and is supported by a common cushion plate, and the cushion plate is held in a reciprocating manner by a single or a plurality of hydraulic adjustment members, a) the workpiece (7) Multi-point support and control mechanism corresponding to the geometric shape of The drawing pin 13 with which the provided cushion plate 8 is provided, and which can be inserted into each target point 20 in correspondence with the hole pattern 18 of the dimensions (a, b) or the pattern division is provided inside the cushion plate. Hydraulic single stroke piston (23) having a double speed is provided, in which case the stroke of the single stroke piston is at most 10 mm, and b) to each single stroke piston (23), the workpiece or the plate holding plate (12). Correspondingly, a single stroke cylinder 35 is provided with hydraulically actuated action zones 21 and 22 which can be selectively connected accordingly. C) A cushion plate 8 is provided at four outer corners. Hydraulically, supported by one differential cylinder piston mechanism (3, 14), each positioned in parallel, and d) the multipoint positioning of the differential cylinder piston system (3, 14) acts of force by corresponding control. Area center of force in the zones (21, 22) When the piece simryeok across the eccentricity occurs, characterized in that the fluid is absorbed by the hydraulic self-elasticity di pipe drawing apparatus. 2. The single stroke piston (23) according to claim 1, wherein the single stroke piston (23) is formed by a perforation or tubular portion at the centering position within the cushion plate (8) itself with respect to the action action zones (21) and (22) of the force, or by inserting connection members (15). Fluid elastic deep drawing device, characterized in that it is connectable by a flexible hose (25) to the lower side of the cushion plate through. 3. The single single stroke piston (23) according to any one of the preceding claims, wherein the individual single stroke pistons (23) can be integrated into the singular or plural attachment plates (24) correspondingly at pattern spacings (a, b), in which case the attachment plates (24). A fluid elastic deep drawing apparatus, characterized by being divided into a large patterned section on the cushioning surface and being fixed in shape connection by a screw engaging member (16). The single stroke piston (23) has one return spring (17) assigned to each of the single stroke pistons (23), and the recesses for centering the drawing pins (13) are respectively located on the upper surface of the single stroke pistons. A fluid elastic deep drawing device, which is provided. According to claim 1 or 2, a plurality of drawing pins (13) are integrated into a group and divided according to the action action zone of the force and are supported by a large single stroke piston (10), respectively, a rectangular support plate ( 11) A fluid elastic deep drawing device comprising: a). The work separation zone of eight forces for the sheet holding plate (12) is provided with one opposing piston cylinder device (5, 32, 33) at the center for the workpiece. Fluid elastic deep drawing apparatus. The action partitioning area of each sheet holding plate and force is one opposing piston cylinder centered by only one strong drawing pin 13 having a large single stroke piston 28, respectively. Fluid-elastic deep drawing device, characterized in that the device (5, 32, 33) is provided. 3. The single stroke piston cylinder mechanism 29, 17, 23, 35 for the opposing piston cylinder device 5, 32, 33 is integrated in the centering position in the table plate 6. The fluid-elastic deep drawing characterized in that the thin plate holding plate 12 of the tool is placed on the table plate 6 and the single stroke piston 29 in a press-opened state by the weight of the tool in a press-opening state. Device. The fluid elastic deep drawing according to claim 1 or 2, wherein the single stroke piston / cylinder mechanisms (10, 11) are coupled to the die (4) while being housed in the outer ram (2 '). Device. The four differential cylinder piston devices (3, 14) are provided with a control mechanism for hydraulically clamping the mechanism under pressure during synchronous operation while positioning in parallel with the servohydraulic. Fluid elastic deep drawing device, characterized in that. The fluid elastic die according to claim 1 or 2, wherein the single stroke piston is provided with a control mechanism for setting a spring constant of the return spring 17 so as to remain at a neutral center position for ± compensation. Drawing device.