JP5760619B2 - Press apparatus and press molding method - Google Patents

Description

  The present invention relates to a metal press manufacturing technique, and more particularly to a press apparatus and a press forming method for physically preventing a workpiece formed when a press mold is opened from sticking to a press upper die and rising.

  In the automobile industry, there is a production technology for press forming using a transfer press or a tandem press. In the transfer press, in order to obtain a molded product of the required product shape, for example, 4 processes 4 molds, workpieces are sequentially pressed into these molds, as in the molding process-> cutting process-> bending process-> drilling process There is.

  In such a press device, if the operating speed is increased in order to increase production efficiency, the operating speed of each process such as the molding process becomes faster, and the raising / lowering speed of the upper mold is increased with respect to the lower mold. To do.

  However, when the movement speed of each process of the press apparatus becomes faster, there is a possibility that the workpiece formed on the upper press die adheres when the press die is opened and rises while sticking. When the sticking phenomenon occurs, the molded workpiece rises and falls while adhering, and the dropped workpiece jumps in the lower mold and does not stabilize and may begin to dance. In severe cases, the workpiece may pop out of the press die during molding.

  Further, when the work is danced and shifted, it becomes difficult to take out the work from the press mold in the previous process and set it in the press mold in the next process, or it cannot be performed accurately. For this reason, it is difficult to improve the operating speed of the press device, which is the limit of increase in production efficiency.

  A conventional press apparatus is described in Patent Document 1.

  This press apparatus lifts and lowers a punch of a press upper die to a die of a press lower die and pushes out a workpiece formed between both dies from a press lower die by a push-out means (plunger and pushing member) that cooperates with a cam mechanism. It is pushed upward to release the shape. The work released from the lower press die is peeled off with a stripper to physically prevent sticking to the upper press die.

  In another conventional example, in order to prevent a phenomenon that a molded workpiece sticks to an upper die of a press, a push-out device in which a spring force is constantly applied to the press device is provided. In this push-out device, a leading pin (SES standard commercial product) supported by a spring protrudes from an upper die, and this leading pin presses and peels off a formed workpiece from the upper die by a spring force to release it. Is provided. The push-out device constantly stabilizes the workpiece by pressing it against the lower die with a spring-biased leading pin regardless of the processing contents of each process such as molding, cutting, bending, and drilling.

Japanese Patent Laid-Open No. 2004-255431

  The press apparatus described in the cited document 1 cannot be used in a molding process for forming a part shape from a plate blank. This press apparatus is used for each press process such as cutting, bending, and drilling in a post process by a forming process.

  In the press apparatus of the cited document 1, a stripper for preventing the workpiece from sticking to the cam-driven push-out means and the press upper die in order to prevent the workpiece from being displaced when the formed workpiece is held by the press die. A complex cooperative operation is required, and it is difficult to improve production efficiency.

  Also, in the press device used for the molding process, when the press mold is released when the press mold is open, the molded mold has been molded from a plate blank due to the negative pressure and the viscosity of the processing oil The workpiece may stick to the upper die. However, in the case where a spring-biased push-out device is provided on the press upper die of the press device, the spring force acting on the leading pin of the push-out device is insufficient and uneven. There is a case where it is not possible to obtain a force to peel off and stably remove.

  The spring-biased leading pin of the push-out device always presses and contacts the plate blank in advance of the upper die during the downward stroke to suppress the blank displacement and stabilize it. When the (material work) is a thin material, the behavior of the material may change due to the pressing force of the preceding pin in the first half of the molding process. The phenomenon in which the behavior of the material in the plate-like blank appears as a wavy phenomenon or wrinkle with a thin material, and is remarkable. If the material behaves and wrinkles occur during the molding process, there are problems such as poor yield, reduced production efficiency, and adversely affecting the panel (work) quality of the molded workpiece.

  The present invention has been made in consideration of the above-mentioned circumstances, and physically prevents the molded workpiece from sticking to the upper mold when the press die is released in the molding process, and prevents the displacement of the workpiece. An object of the present invention is to provide a press apparatus and a press molding method capable of improving production efficiency.

  Another object of the present invention is to provide a press apparatus and a press molding method that can increase the press operation speed, prevent the misalignment of the formed workpiece even when the speed is increased, and have high production efficiency. .

In order to solve the above-described problems, the present invention forms a press mold by providing a press lower mold and a press upper mold so as to be capable of relative movement, and a material workpiece carried between the press lower mold and the press upper mold. In a press device for forming a molded workpiece by press molding, a plurality of push-out cylinder devices are respectively provided in the recessed portions of the upper press die, and a cylinder rod of the push-out cylinder device is advanced and retracted toward the lower press die side. It is provided freely and elastically supports a blank holder that receives the material work to be carried between the upper press die and the lower press die, and the blank holder holds the material work as the press upper die is lowered. Then, the molding process is started by being guided to the workpiece machining position, and further, the press upper die is lowered and the molding process is finished at the bottom dead center position. Is released, during the opening of the press die, the one that increase of the blank holder rises of the upper mold to press is followed, is projected to a cylinder rod of the push-out cylinder device is operated air cylinder, the shaped workpiece Is a press machine characterized in that it is detached from the upper die of the press.

In order to solve the above-described problems, the present invention provides a press lower mold and a press upper mold so that they can move relative to each other, and press-molds a material workpiece carried between the press lower mold and the press upper mold. In a press molding method for forming a molded workpiece, a blank holder for receiving a material workpiece to be loaded is elastically supported between the upper press die and a lower press die, and the blank holder is made of a material as the press upper die is lowered. While the workpiece is sandwiched, the workpiece is guided to the workpiece machining position to start the molding process, while the press upper die is further lowered to finish the molding process at the bottom dead center position, and the press die is opened. during mold opening, to protrude the press lower mold side cylinder rod of the push-out cylinder device provided in the press upper mold by an air cylinder actuated, the push-out The air cylinder actuation of the cylinder rod of Sunda device, a press-molding method characterized by disengaging the molded workpiece from the press upper mold.

  The present invention allows the molded workpiece to be detached from the upper press die when the press die of the press device is opened, preventing the molded workpiece from sticking to the upper press die, and preventing misalignment and deformation of the molded workpiece. It is possible to stabilize the workpiece posture and further increase the speed of the press device.

The process figure explaining one example of the flow of each press process by a press apparatus in order. BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of the press apparatus which concerns on this invention is shown, and the block diagram which shows in principle the press die for drawing used for a formation process. The block diagram which shows the press molding state when a press upper mold | type takes a bottom dead center position in the press metal mold | die shown by FIG. (A) and (B) are the figures which expand and show the A section and B section of FIG. 3, respectively. The block diagram which shows the raise of the press upper mold | type at the time of opening of a press metal mold | die. (A) is a figure which shows the relationship between the raising / lowering stroke of the press die which comprises a press apparatus, and the crank angle (shaft angle) of a press apparatus, (B) is the carrying in / out apparatus of a press apparatus, a blank holder, and a push-out cylinder apparatus The figure which shows the relationship between an operation timing and an operation range (operation time). The figure which compares and shows the press operation speed of a press apparatus by the presence or absence of a pushout cylinder apparatus. The perspective view which shows 2nd Embodiment of the press apparatus which concerns on this invention. (A) is a figure which shows the relationship between the raising / lowering stroke of the press die used for the press apparatus of FIG. 8, and the crank angle (shaft angle) of a press apparatus, (B) is the carrying in / out apparatus of a press apparatus, a blank holder, and a pushout The figure which shows the relationship between the operation timing of a cylinder apparatus, and an operation range (operation time).

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

  FIG. 1 shows each press process of the press apparatus 10 which comprises a transfer press machine (line). This press apparatus 10 is for press-molding a plate blank to obtain a necessary three-dimensional (3D) product work. Basically, a molding process 11 → a cutting process 12 → a bending process 13 → a drilling process 14 Thus, for example, it is constituted by a manufacturing process of a 4-step 4-type automatic press line. The press apparatus 10 sequentially sends a workpiece to a press die for performing each pressing step to obtain a necessary product shape. Depending on the shape of the product molded by the press apparatus 10, a press mold for cutting and part molding is used as necessary for the press mold in the cutting step 12, and partial molding is performed on the press mold in the drilling step 14. And a press die for drilling is used.

[First Embodiment]
FIG. 2 is a principle configuration diagram showing the first embodiment of the press device 10 used in the forming step 11.

  This press apparatus 10 shows a press die 16 for drawing a three-dimensional uneven shaped molded workpiece from a plate blank (material workpiece). The press mold 16 is provided with a press upper mold 18 on a fixed press lower mold 17 so as to freely move up and down. Between the press upper mold 18 and the press lower mold 17, a blank holder 20 that is guided up and down by a guide member (guide post) 19 is elastically supported in a floating state. The blank holder 20 is spring-biased upward by a spring (not shown), and the plate-like blank 21 (W) carried on the blank holder 20 is held. The plate blank (material workpiece W) 21 carried between the press upper mold 18 and the press lower mold 17 is moved to a required position, for example, by the press upper mold 18 and the blank holder 20 as the press upper mold 18 moves downward. The peripheral part or both side parts of the material workpiece W are sandwiched and blank-held before being formed.

  The press upper die 18 and the blank holder 20 are further lowered while the plate-like blank 21 is blank-held, and reach the machining start position, and the drawing process is started. Instead of elastically supporting the blank holder 20 on the lower press die 17 side, the blank holder 20 may be lifted and lowered by supporting the spring on the upper press die 18 side.

  Specifically, the plate blank (material workpiece W) 21 carried between the lower mold 17 and the upper mold 18 of the press mold 16 is guided onto the blank holder 20. The guided material workpiece W is received by the blank holder 20. The blank holder 20 is integrally lowered while the material work W is elastically blank-held as the press upper die 18 is lowered. The plate blank (material workpiece W) 21 is in a blank-held state, and the upper press die 18 descends, reaches a processing start position where it comes into contact with the lower press die 17, and molding processing is started. When the forming process is started and the process progresses and the press upper die 18 reaches the bottom dead center position as shown in FIG. 3, the forming step 11 is completed, and the press die 16 is opened.

By forming the press die 16, the plate blank (material workpiece W) 21 is press-formed into a necessary product shape between the lower press die 17 and the upper press die 18 and drawn into a three-dimensional shape. Shaped workpiece W ₁ is manufactured by the completion of the press-forming.

The forming step 11 is a step of forming a required three-dimensional concavo-convex shape from the plate blank 21, and a formed product in which the forming step 11 is completed is defined as a formed workpiece W ₁ .

When the upper mold 18 of the press mold 16 reaches the bottom dead center position and the molding step 11 is completed, the press mold 16 is opened, and the press upper mold 18 moves away from the press lower mold 17. When pressing the upper die 18 rises, the negative pressure generated on the contact surface of the molded workpiece W ₁ and the press upper mold 18 (the mold forming surface) (hereinafter, referred to as type negative pressure.) For and processing oil viscosity, shaped workpiece W ₁ is sticking to press the upper mold 18, there is a possibility to rise while stuck.

At the time of press die opening forming step 11, the shaped workpiece W ₁ follows the type negative pressure of the press upper die 18, fall moves upward while stuck to the press upper die 18, the dropped workpiece pressing under not stable bouncing in the mold 17, or out dance molded workpiece W _1, which may work position becomes unstable shifts. In order to prevent this, a push-out cylinder device 24 is provided.

  The push-out cylinder device 24 is a commercially available air cylinder, and a plurality of, for example, several places are provided in a required recessed portion (cavity) 25 of the press upper die 18. The recessed portion 25 of the press upper die 18 is formed in a cavity between the reinforcing die ribs 23 of the press upper die 18 as shown in FIG. Each push-out cylinder device 24 is used as an air cylinder interlocked with the press device 10 by an air pipe 27 through an air circuit (not shown). The push-out cylinder device 24 has a cylinder rod 29 protruding from a cylinder body 28. As shown in FIGS. 4A and 4B, the upper die 18 is provided from the upper press die 18 to the lower press die 17 side so that it can be protruded and retracted (moved forward and backward) by air drive instead of spring force.

The cylinder rod 29 of the push-out cylinder device 24 is provided so as to be able to advance and retreat or project and retract from the guide port (opening) 31 of the upper press mold 18 toward the molding surface 17a of the lower press mold 17 or the peripheral blank holder 20 side. Pushout cylinder device 24, the type negative pressure by point lifting up the large molded workpiece W _1, or attached to the scrap object part of the shaped workpiece W.

The cylinder rod 29 of the push-out cylinder device 24 is formed in a curved surface shape in which the rod tip is curved in an arc shape or an elliptical shape, and is damaged by contact with the plate-shaped blank (material workpiece W) 21 or the molded workpiece W _1. It is preventing. The cylinder diameter of the push-out cylinder device 24 is formed to several tens mmφ, for example, 50 mmφ. An opening of several tens of mmφ, for example, 30 mmφ is also formed in the guide port 31 of the press upper die 18, and a cylinder rod (elevating rod) 29 is provided in the guide port 31 so as to be freely inserted.

  The cylinder rod 29 of the push-out cylinder device 24 penetrates the guide port 31 of the upper press die 18 so as to protrude and retract toward the lower press die 17 side, and the press die is opened in conjunction with the crank angle of the press device 10. Sometimes it works at the required timing.

When the upper die 18 of the press die 16 is lowered and reaches the bottom dead center position, as shown in FIG. 3, the press drawing process of the press die 16 is finished and the press die 16 is opened. When the press die 16 is opened, the press molding process is completed and the press upper die 18 is raised as shown in FIG. 5, while the push-out cylinder device 24 is operated at a required operation timing described later, and the cylinder rod 29 is operated. There extrusion molding workpiece W ₁ and protrudes from the press upper die 18 can be disengaged by pushed down from the press upper die 18. When the press upper die 18 is raised, the push-out cylinder device 24 is operated to push out the formed workpiece W ₁ , push it down, and release it, thereby actively and forcibly pulling the molded workpiece W ₁ from the press upper die 18. Can be peeled off.

Further, upon opening of the press die 16, by the operation of the push-out cylinder device 24, the shaped workpiece W ₁ can be prevented from sticking to the molding surface 17a of the lower press die 17. The lower press die 17, the air vent grooves (not shown) is preformed to a desired position of the molded surface 17a, with lamination of the shaped workpiece W ₁ is prevented by the air vent grooves. Furthermore, with bonded to the molded workpiece W ₁ of the lower press die 17 is prevented by increasing the blank holder 20 to follow the increase of the press upper die 18.

In this sense, the cylinder rod (operating rod) 29 of the push-out cylinder device 24 functions as a push-out rod and a push-out rod. The push-out cylinder device 24 may be a commercially available product of the air cylinder is driven by an air cylinder actuated, so eliminating the need for use of spring force, it is possible to increase the pushed down force of the molded workpiece W ₁ stably It is possible to effectively prevent sticking to the press upper die 18. Further, since the push-out cylinder device 24 is configured to operate an air cylinder in conjunction with the crank angle of the press device 10, the operation timing control can be freely adjusted, and the degree of freedom is high, and the always-on operation is possible. Since no spring force is required, the behavior of the material of the plate blank in the first half of the molding process can be prevented beforehand.

  The press device 10 is configured to rotate the press shaft of the press device 10 by a motor drive of an electric motor (not shown) and to move the upper die 17 of the press die 16 to move up and down. The carry-in / out device, the blank holder 20 and the push-out cylinder device 24 of the press device 10 constituting the transfer press machine are controlled by a predetermined operation timing based on the crank angle (shaft angle) of the press device 10.

[Relationship between press die lift stroke and press device crank angle]
6A shows the relationship between the lifting stroke S of the upper die 17 of the press die 16 and the crank angle (shaft angle) of the press device 10, and FIG. 6B shows the carry-in / out device, blank holder, and It is a figure which shows the relationship between the operation timing of the pushout cylinder apparatus 24, and an operation range (operation time), respectively.

6A shows the relationship between the lift stroke S of the upper mold 18 of the press die 16 and the crank angle of the press device 10 in the molding step 11, and the area WA is defined by the push-out cylinder device 24. FIG. This is an area corresponding to the operation time in which the material workpiece W (W ₁ ) of the upper press mold 18 is pressed and contacted, and shows the operation range of the push-out cylinder device 24. Since the push-out cylinder device 24 is air operated, the operation timing of the cylinder rod is adjusted in consideration of the operation delay. This operation timing is such that, for example, the push-out cylinder device 24 is turned ON immediately before the press die 16 is opened.

The press upper die 18 is brought into contact with the material workpiece (panel) W in the lowering process and is sandwiched between the blank holders, further lowered while being blank-held, and is press-molded in cooperation with the press lower die 17. Area WA is press die 16 is opened to complete the press molding of the material workpiece W, the shaped workpiece W ₁ is pushed out from the press upper die 18, it refers to the operating area to be disengaged. The press upper die 18 starts press forming, and after the forming starts, press forming proceeds to complete the forming of the material workpiece W, and when the press die 16 is opened, the press upper die 18 is separated from the press lower die 17. Rise. Even if the molded workpiece W ₁ rises together with the press upper die 18 due to the negative pressure of the die, the molded workpiece W ₁ is removed from the press upper die 18 by the pressing (push out) action of the cylinder rod 29 of the push-out cylinder device 24. It is pushed out, pushed down and separated.

  6 shows an example of the operation timing of the carry-in / out device, blank holder 20 and push-out cylinder device 24 shown in FIG. 6B in relation to the crank angle of the press device 10 (the lifting stroke S of the press upper die 18).

  The carry-in / out device performs a carry-in operation I and a carry-out operation O at a predetermined operation timing corresponding to the crank angle (shaft angle) of the press device 10, and a symbol C between the carry-out operation O and the carry-in operation I These show the conveyance operation | movement to the following process (cutting process) by a shuttle conveyor.

  Further, the blank holder operates in conjunction with the carry-in / out device in the molding step 11, and the blank holder also performs the lowering operation D and the rising operation U at a predetermined operation timing corresponding to the crank angle of the press device 10. The The symbol US during the operation of the blank holder indicates a period of waiting in the raised position.

On the other hand, the push-out cylinder device 24 operates in conjunction with the press molding process of the press device 10 in the molding process 11. In the push-out cylinder device 24, the press molding conditions and the motion of the press device 10 are different depending on the shape and size of the molded product to be molded, and the operation time and operation timing of the push-out cylinder device 24 are different. Specifically, it is pushed out by operating in the area WA where the workpiece W (W ₁ ) is in contact with the upper die 18 of the press.

  The operation timing of the push-out cylinder device 24 is controlled by controlling the supply of air by an air control device (not shown).

[Press operation speed of press equipment]
Pressing device 10 of the present invention, by the operation of the push-out cylinder device 24, upon opening of the press die 16, protrudes a cylinder rod 29 from the press upper die 18, actively molded workpiece W ₁ to the lower press die 17 side Therefore, it is possible to forcibly push down and disengage from the press upper die 18, and to prevent the molded workpiece W ₁ from sticking to the press upper die 18 without fail. Actuating the cylinder rod 29 of the push-out cylinder 24 upon opening of the press die 16, the molding workpiece W ₁ and push out, since is detached from the press upper die 18, the shaped workpiece W ₁ to the press upper die 18 Can be prevented from being stuck and carried, and the displacement of the workpiece and the deformation of the workpiece can be prevented.

  Therefore, the press operation speed of the press apparatus 10 can be increased, and even if the press apparatus 10 is increased in speed, the displacement of the workpiece and the deformation of the workpiece can be reliably prevented. The press operation speed of the press apparatus 10 is represented by SPM. SPM is an index of how many press products can be produced per minute.

  In the press apparatus 10 used in the transfer press machine, the press operation speed SPM differs depending on whether the workpiece W press-molds a large panel, a medium panel, and a small panel. When the push-out cylinder device 24 is provided, the press operation speed SPM can be increased by about 20% to 50% compared to the case where the push-out cylinder device 24 is not provided.

  For example, as shown in FIG. 7, in a large panel such as a high roof or a body, the upper limit value of the press device 10 having a push-out cylinder device is 7 to 8 SPM from the conventional 6 SPM, and a medium-sized panel such as a hood outer (bonnet) is used. The SPM upper limit could be increased from about 12 SPM to about 16 SPM.

[Second Embodiment]
FIG. 8 shows a second embodiment of the pressing device according to the present invention.

  The press apparatus 10A shown in the second embodiment is used in a molding step 11 of a transfer press machine (line). The overall configuration of a press die 16A used in the press apparatus 10A is shown in FIG. Since it is not substantially different from the press die 16 shown in FIG. 5, the same components are denoted by the same reference numerals and description thereof is omitted.

In the press die 16A shown in FIG. 8, the press upper die 18A is simply displayed. The press upper die 18A is provided with several push-out cylinder devices 24 in recessed portions (cavities) between reinforcing die ribs (not shown). Each push-out cylinder device 24 is preferably provided corresponding to the plate-shaped blank (material workpiece W) 21 Scrap corresponding site (portion other than the product shape) of the or part is greater lift of the shaped workpiece W _1.

  A press die 16A shown in FIG. 8 and an upper press die 18A shown in FIG. FIG. 8 shows an example in which the press upper die 18A is moved up and down with respect to the press lower die 17A.

A press apparatus 10A shown in FIG. 8 constitutes a transfer press machine (line), and a shuttle conveyor (not shown) is used to convey the workpiece W between adjacent press apparatuses 10A. Plate blank (material workpiece W) 21 from the direction of arrow 1 to the press mold 16A of the press apparatus 10A is fed, also shaped workpiece W ₁ is fed toward the arrow O direction.

Specifically, the press die 16A of the press device 10A is connected to the lower die 17A of the press die 16A by an automatic transfer device such as a shuttle conveyor (not shown) that operates in conjunction with the lifting stroke of the press device 10A. A plate-shaped blank (material workpiece W) 21 is carried in between the upper mold 18A, and the loaded material workpiece W is lowered by a blank holder (work lifter) and molded by the press die 16A. Molding molded workpiece W ₁ was is moved upward by the blank holder again by the automatic conveying device is carried out to the next process (cutting step).

  A plate-shaped blank (material workpiece W) 21 carried between the lower mold 17A and the upper mold 18A of the press mold 16A is received at a raised position of a blank holder (not shown) and guided to the guide member 35 by the lowered position. It is guided to the workpiece machining position. At this workpiece machining position, the press mold 18A is press-molded into the required three-dimensional shape by the up-and-down stroke of the press upper die 18A.

When the press upper mold 18A when the opening of the molding step 11 the press mold 16A is raised away from the lower mold 17A, the shaped workpiece W ₁ and generates the contact surface between the pressing upper die 18A type negative pressure and process oil for viscous, fear arises that the shaped workpiece W ₁ is increased while stuck to the press upper mold 18A. Shaped workpiece W ₁ is pushed out cylinder device 24 is provided in order to prevent sticking to the press upper mold 18A.

In the molding process 11, after press molding, the shaped workpiece W ₁ at the time of press die 16A open tries Mochiagaro to follow the increase of the press upper mold 18A. At the time of press mold 16A open, shaped workpiece W ₁ is Ika with the upper mold 18A press to follow by the type negative pressure of the press upper die 18A, or out dancing is molded workpiece W _1, work attitude is unstable However, the instability of the workpiece posture is prevented by pushing out, pushing out and separating the push-out cylinder device 24.

Pushout cylinder device 24, for example shaped workpiece W ₁ is the side body and Doafuroa (inner floor, rear floor) as such panel mounting position different by the component sizes and component shapes of the molded article. Generally, it is provided in a flat portion of the upper die 18A (molding surface 18a) corresponding to a portion that becomes scrap in the subsequent process (cutting process) of the press device 10. When the molded product is a rear floor of a vehicle body, the molded product is provided on the flat portion of the press upper die 18A corresponding to the inside of the product.

  9A shows the relationship between the lift stroke S of the press die 16A constituting the press apparatus 10A and the crank angle of the press apparatus 10A, and FIG. 9B shows the carry-in / out apparatus, blank holder and push-out cylinder apparatus. It is a figure which shows the relationship between the operation timing of 24, and an operation range (operation time), respectively.

9A shows the relationship between the lift stroke of the upper die 18A of the press die 16A and the crank angle of the press device 10A in the molding step 11. In the region WA, the push-out cylinder device 24 operates. a region corresponding to the operating time to push out the molded workpiece W ₁ Te shows the operating range of the push-out cylinder device 24.

The press upper die 18A comes into contact with the material workpiece W in the descending process and is press-molded in cooperation with the press lower die 17A. Area WA refers to working areas pushout cylinder device 24 upon opening of the press die 16A through the forming completion pushes out the molded workpiece W ₁ from the start of molding work W. The press upper die 18A comes into contact with the material workpiece W in the middle of the lowering stroke and cooperates with the press lower die 17A to perform press molding. Press die 16 is opened by progressed press molding molding material workpiece W is completed, it increases the press upper mold 18A is away from the press lower mold 17A, the shaped workpiece W ₁ is type negative pressure pressing on the like be increased with the mold 18A, the shaped workpiece W ₁ is being Tsukiotosa pushed out from the cylinder rod of the push-out cylinder 24, is held in a state of being separated from the press upper die 18A, the work posture is maintained .

  Moreover, an example of the operation timing of the carry-in / out device, the blank holder, and the push-out cylinder device 24 shown in FIG. 9B is shown in relation to the crank angle of the press device 10A (the up / down stroke S of the press upper die 18A).

  The carry-in / out device performs a carry-in operation I and a carry-out operation O at predetermined operation timings corresponding to the shaft angle of the press device 10A, and a symbol C between the carry-out operation O and the carry-in operation I is a shuttle conveyor. The conveyance operation | movement to the following process (cutting process) by is shown.

  Further, the blank holder operates in conjunction with the carry-in / out device in the molding step 11, and the blank holder is also subjected to the lowering operation D and the rising operation U at a predetermined operation timing corresponding to the shaft angle of the press device 10A. The The symbol US during the operation of the blank holder indicates a period of waiting in the raised position.

On the other hand, the push-out cylinder device 24 performs a push-out operation when the press die 16A is opened in conjunction with the press molding process of the press device 10A in the molding step 11. The push-out cylinder device 24 has different press molding conditions and motion of the press device 10 depending on the shape and size of the molded product to be molded, and the push-out cylinder device 24 has different operating time and operation timing. Specifically, the push-out cylinder device 24 operates in a region where the press upper die 18 is in contact with the workpiece W (W ₁ ) and performs a push-out operation.

  The operation timing of the push-out cylinder device 24 is controlled so that the air valve is opened and closed by the air control device in conjunction with the lifting and lowering operation of the press device 10A.

  Next, the operation of the push-out cylinder device 24 will be described.

In the forming step 11 of the transfer press machine, the operation timing of the carry-in / out device, the blank holder and the push-out cylinder device 24 depends on the size and shape of the workpiece W (W ₁ ) and the press conditions based on the crank angle of the press device 10A. Accordingly, it is set as an example as shown in FIG.

  When press molding proceeds from the start of molding of the press mold 16A, the press upper mold 18A passes through the bottom dead center shown in FIG. 9A, and the molding is completed, the press mold 16A is opened and the press upper mold 18A is pressed. It rises away from the lower mold 17A.

When the press upper mold 18A at the time of press die opening enters the increasing step, the type negative pressure of the press upper mold 18A, is raised by adsorbing molded workpiece W _1. However, attempting to follow molded workpiece W ₁ and is raised to increase the press upper mold 18A, it is projected to the cylinder rod 29 operated pushout cylinder device 24, the shaped workpiece W ₁ from the press upper mold 18A push-out, so pushes her, it is possible to prevent displacement with increasing molding workpiece W _1. Since molded workpiece W ₁ increases while maintaining the work position, it is possible to send a molded workpiece W ₁ accurately.

Therefore, it is possible to speed up the press apparatus 10A, even when quickly pressing operation of the press apparatus 10A, the shaped workpiece W ₁ has a stable work position without positional deviation occurs is maintained. Shaped workpiece W ₁ is pulled by the type negative pressure of the press upper mold 18A, even if increased in adhesion state, the protrusion of the cylinder rod 29 of the push-out cylinder device 24, the shaped workpiece W ₁ from the press upper die 18A Since it is pushed out and peeled off, a stable work posture is maintained.

In the press apparatus 10A, the shaped workpiece W ₁ at least the press die opening pushout cylinder device 24 is disengaged by pushing out from the press upper die 18A, so to stabilize the work attitude, the press upper die 18A is Ika have stuck molding workpiece W _1, it is possible to prevent the deformation of the displacement and workpiece of the workpiece occurs. Therefore, the press operation speed of the press apparatus 10A can be increased. Even if the speed of the press device 10A is increased, it is possible to reliably prevent the displacement of the workpiece and the deformation of the workpiece. The press operation speed of the press apparatus 10A is represented by SPM, and SPM is an index of how many sheets can be produced per minute.

  In the press apparatus 10A used in the molding process 11 of the transfer press machine (line), the press operation speed SPM is different for the plate blank (material workpiece W) 21 for the large panel, the medium panel, and the small panel. When the push-out cylinder device 24 is provided on the upper die 18A of 16A, the press operation speed SPM can be increased by about 20% to 50%.

  For example, in a large panel such as a side body or a high roof, the upper limit value of the SPM of the press apparatus 10A having the push-out cylinder device 24 is changed from the conventional 5-6 SPM to 7-8 SPM, and the middle panel such as a hood outer (bonnet) is used. The SPM upper limit is about 16 SPM from the conventional about 12 SPM. It can also be raised by a press device using a tandem press instead of the transfer press.

The provided pushout cylinder device 24 to the upper die 18A of the press die 16A, so to stabilize the work posture of the shaped workpiece W ₁ at the time of press die 16A open, even faster press apparatus 10A, the following step can be prevented (bending step) workpiece seating errors of the molded workpiece W ₁ to be sent to, it contributes to the improvement of productivity.

  A transfer press machine (line) is a press device that moves and processes each process such as a molding process, a cutting process, a bending process, and a drilling process at the same time, and an automatic transfer device called a feed bar is used for transfer between the processes. Used. A tandem press (line) is a line in which the mold of each process moves independently, and a robot, a crossbar, or the like is used for conveyance between the processes.

  In the embodiment of the present invention, an example in which a plurality of push-out cylinder devices are provided on the press upper die of the press device has been described. However, this push-out cylinder device is interlocked with the crank angle of the press device and is controlled by an air control device. A commercially available air cylinder that is driven by air can be used. Moreover, this push-out cylinder device can be configured with a combination of standard air cylinder parts, can be easily assembled at the manufacturing site, can be detachably installed in the recessed part of the upper die of the press, and can be repaired and maintained.・ Inspection is easy.

  In addition, this push-out cylinder device can finely adjust the operation timing at the production site, and can be used repeatedly and repeatedly, so it is economical and convenient.

10, 10A Press device 11 Molding process 12 Cutting (partial molding) process 13 Bending process 14 (Partial molding) Drilling process 16, 16A Press mold 17, 17A Press lower mold 17a Mold molding surface 18, 18A Press upper mold 18a Mold molding Surface 19 Guide member (guide post)
20 Blank holder 21 Plate blank (Material work W)
23 type rib 24 push-out cylinder device 25 recessed portion (cavity)
27 Air piping 28 Cylinder body 29 Cylinder rod (push-out rod, actuating rod)
31 Guide port 35 Guide member

Claims (5)

A press apparatus that forms a press work by forming a press mold by providing a press lower mold and a press upper mold so as to be relatively movable, and press-molding a material work carried between the press lower mold and the press upper mold In
A plurality of push-out cylinder devices are respectively provided in the recessed portions of the press upper die,
A cylinder rod of the push-out cylinder device is provided so as to freely advance and retract on the press lower mold side,
Between the upper press die and the lower press die, elastically supports a blank holder that receives the material work to be carried,
The blank holder is guided to the workpiece machining position in a state where the material workpiece is sandwiched as the press upper die is lowered, and the molding process is started.
Furthermore, the press upper die is lowered and the molding process is finished at the bottom dead center position, and the press die is opened,
When the press die is opened, the blank holder rises following the rise of the press upper die, while the push-out cylinder device is operated by an air cylinder to project the cylinder rod, and the formed workpiece is pressed. A pressing device characterized by being detached from the upper die. A plurality of the push-out cylinder devices are provided in the recessed portions formed between the reinforcing mold ribs of the press upper mold,
The press device according to claim 1, wherein the push-out cylinder device is attached at a position corresponding to a workpiece scrap target portion or a portion where the lift of the molded workpiece is large in accordance with a product shape of the molded workpiece. The cylinder rod of the push-out cylinder device has a rod tip formed in an arcuate or elliptical curved surface,
The press device according to claim 1 or 2, wherein the cylinder rod is freely adjustable by changing an operation stroke in accordance with a mounting position and a product shape of a molded workpiece. The press device according to claim 1, wherein the push-out cylinder device is operated at a timing immediately before or after the press die is opened to project the cylinder rod toward the lower press die and to release the formed workpiece from the upper press die. In a press molding method in which a press lower mold and a press upper mold are provided so as to be movable relative to each other, and a material workpiece carried between the press lower mold and the press upper mold is press molded to form a molded workpiece.
Between the upper press die and the lower press die, elastically supports a blank holder that receives the material work to be carried,
While the blank holder is guided to the work processing position in a state of sandwiching the material work as the upper die of the press is lowered,
Lower the press upper die and finish the molding process at the bottom dead center position to open the press die,
When opening the press die, the cylinder rod of the push-out cylinder device provided in the upper press die is protruded to the lower press die side by air cylinder operation ,
A press molding method, wherein a molded workpiece is detached from the press upper die by an air cylinder operation of a cylinder rod of the push-out cylinder device.

Images