JP2014091129A - Hot press molding facility, and hot press molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize a hot press molding facility, and to prevent the degradation of productivity.SOLUTION: A hot press molding method includes: a step for releasing the locking of one set of adjacent molds 11a and 11b of adjacent molds, and locking all of the other adjacent molds 11b-11d; a step for press-molding a steel plate W1 heated by the one set of the adjacent molds 11a and 11b released from locking, and locking the one set of the adjacent molds 11a and 11b in that state; and a step for press-molding a steel plate W2 heated by releasing the locking of the other set of the adjacent molds 11b and 11c while the steel plate W1 molded by the one set of the adjacent molds 11a and 11b is cooled and hardened.

Description

  The present invention relates to a hot press forming facility and a hot press forming method.

  For example, in an automobile body, due to an increase in demand for weight reduction, an increase in the tension of a steel plate constituting the body is being actively performed. Since a high-tensile steel plate has high strength, it is difficult to form it into a predetermined shape. In particular, so-called ultra-high-tensile steel (super high-tensile material) exceeding 1000 MPa cannot often obtain desired dimensional accuracy by press molding at room temperature. In such a case, hot press forming (die quench method) in which a heated steel plate is put into a press die, and the steel plate is cooled and quenched while being formed with the press die has been studied.

  In general hot press forming, a steel plate to be formed is heated in a heating furnace in advance, and then the heated steel plates are put into a press die one by one and subjected to press forming, and the steel plate is brought into contact with the press die. Quenched and quenched. For example, Patent Document 1 discloses that the production rate is improved by simultaneously heating a plurality of steel plates and simultaneously press-molding the heated steel plates. I am trying.

  Patent Document 2 discloses a press forming apparatus in which a plurality of pairs of forming dies are arranged in series in the order of processes so that the processing of steel sheets proceeds sequentially from one to the other. Even in this press forming apparatus, a plurality of steel plates are press formed at once with all dies.

JP 2005-271038 A Japanese Patent Laid-Open No. 2005-81410

  However, as described above, if a plurality of steel plates are to be press-formed at the same time, it is necessary to increase the pressure of the press machine, so that the drive mechanism (hydraulic cylinder or the like) increases in size, resulting in an increase in equipment size.

  From the above circumstances, the technical problem to be solved by the present invention is to reduce the size of the hot press forming equipment.

  The present invention made in order to solve the above-mentioned problems is a hot press forming facility for press forming a heated steel plate, wherein a heating device for heating the steel plate and three or more dies are arranged in series. A press mold having molding surfaces on the surfaces of adjacent molds facing each other, a driving means for driving the press mold, a lock mechanism for locking the adjacent molds in a clamped state, The present invention provides a hot press forming facility provided with a lock control unit that controls attachment / detachment of a lock mechanism.

  According to this hot press forming equipment, all other adjacent molds are locked except for one set of adjacent molds, so that only one set of unlocked adjacent molds is heated. It is possible to press form steel plates. In this case, since only one steel plate is subjected to press forming, the pressing force can be reduced as compared with the case where a plurality of steel plates are simultaneously formed, and the mold driving device can be downsized. Moreover, in the above hot press forming equipment, by having a lock control unit that controls the attachment and detachment of the lock mechanism, in a state where the mold is clamped, the lock mechanism of a desired set of molds is released, and other than that By locking all the locking mechanisms and driving the press mold in the mold opening direction in this state, only a desired set of molds can be opened.

  As described above, there is a concern about productivity reduction when performing press molding with a set of molds. However, with the above hot press molding equipment, the molds are clamped after press molding with a set of molds. By locking these molds in the state, the steel sheet can be cooled and quenched. In the meantime, the other set of molds can be unlocked, and another steel plate can be pressed with these molds. Thus, while performing quenching on the steel sheet, by performing press molding of other steel sheets, it is possible to suppress a decrease in productivity and sufficiently secure the quenching time of the steel sheet, The dimensional accuracy of the product can be increased. One set of molds may be common to the set of molds for quenching and the set of molds for press forming.

  If the press mold opens in the horizontal direction and the heating device is provided above the press die, the steel plate heated by the heating device is lowered using its own weight to press the mold. Therefore, the conveying device is simplified.

  As described above, according to the present invention, it is possible to reduce the size of the entire hot press forming facility by reducing the size of the drive device for the press mold.

It is a side view of the hot press molding equipment concerning one embodiment of the present invention. It is a front view of the said hot press molding equipment. It is sectional drawing which shows a locking mechanism. It is sectional drawing of a heating apparatus. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment. It is a side view which shows the procedure of the hot press molding method by the said hot press molding equipment.

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

  As shown in FIGS. 1 and 2, a hot press forming facility 1 according to an embodiment of the present invention includes a press forming device 10, a heating device 20 provided above the press forming device 10, and a press forming device. 10 is provided with a discharge device 30 provided below 10 and a transport device 40 that supports and transports the steel plate W.

  The press molding apparatus 10 has a press mold 11 that opens a mold clamping in the horizontal direction. The press die 11 has three or more dies, and in this embodiment, as shown in FIG. 1, a fixed die 11a and a plurality of movable slidable in the horizontal direction (first movable in the illustrated example). A mold 11b, a second movable mold 11c, and a third movable mold 11d). The fixed mold 11 a is fixed to the fixed plate 15. The first movable mold 11b to the third movable mold 11d can slide in the horizontal direction along the slide rail 16, respectively. The third movable mold 11d is connected to the hydraulic cylinder 18 via the movable plate 17, and is driven in the horizontal direction. A convex molding surface 12a is formed on the right side of the fixed mold 11a in the drawing. In the first movable mold 11b and the second movable mold 11c, a concave molding surface 12b is formed on the left surface in the drawing, and a convex molding surface 12a is formed on the right surface in the drawing. A concave molding surface 12b is formed on the left surface of the third movable mold 11d. A cooling water channel (not shown) is formed inside each of the molds 11a to 11d. 2, illustration of the fixed plate 15, the movable plate 17, and the hydraulic cylinder 18 is omitted.

  The press mold 11 is provided with a lock mechanism 13 that locks adjacent molds in a clamped state. The attachment / detachment of each lock mechanism 13 is controlled by a lock control unit (not shown). In the illustrated example, lock mechanisms 13 are provided at both upper and lower ends of the press die 11 in the width direction (left and right direction in FIG. 2). For example, as shown in FIG. 3, the lock mechanism 13 is attached to a rotating shaft 13a attached to one adjacent mold (for example, the first movable die 11b), a pin 13b extending from the rotating shaft, and a tip of the pin 13b. And a locking portion 13c. The rotating shaft 13a can be rotated by a rotation driving unit (not shown). The pin 13b can be expanded and contracted by an expansion / contraction drive unit (not shown). In the unlocked state, as shown by a dotted line in FIG. 3, the locking portion 13c is retracted from the other mold (for example, the fixed mold 11a). From this state, the rotation shaft 13a is rotated in the counterclockwise direction in the figure by the rotation driving portion (see arrow A), and the locking portion 13c is fitted into the recess 13d provided in the other mold. . Further, by retracting the pin 13b with the expansion / contraction drive part (see arrow B), the locking part 13c is moved to the right side in the figure and engaged with the side wall of the recess 13d, so that adjacent molds (in the illustrated example) The fixed mold 11a and the first movable mold 11b) are biased in the mold clamping direction.

  As shown in FIG. 1, concave portions 14 are formed at positions facing each other on the clamping surfaces of the respective molds of the press mold 11. In the example of illustration, the recessed part 14 is formed in the lower end of the clamping surface of each metal mold | die. In a state where the mold is clamped, a support member 41 of the transfer device 40 described later can be accommodated in the space formed by these recesses 14.

  The heating device 20 is attached to the slide rail 21 and is slidable in the direction in which the press mold 11 is closed (the left-right direction in FIG. 1). The heating device 20 of the present embodiment is a heating furnace that heats a steel plate with a heater. Specifically, as shown in FIG. 4, a heater 23 provided inside the case 22, a heat holding material 24 covering the heater 23, and a heat insulating material laid between the heat holding material 24 and the case 22. 25. A carry-in port 22a and a carry-out port 22b are provided on the upper and lower surfaces of the case 22, respectively. The carry-in port 22a and the carry-out port 22b communicate with each other in the vertical direction through the through hole 22c. A heater 23, a heat retaining material 24, and a heat insulating material 25 are provided on both sides of the through hole 22c in the horizontal direction. Opening / closing members 26a and 26b capable of opening and closing the carry-in port 22a and the carry-out port 22b are provided. The heating device 20 is not limited to a heating furnace, and may be, for example, an electric heating device.

  The discharge device 30 discharges the formed steel sheet to the outside of the hot press forming facility 1. For example, as shown in FIG. 1, a belt having an endless belt 31, a drive roller 32, and a driven roller (not shown). Consists of a conveyor.

  The transport device 40 includes a support member 41 that supports the steel plate W, and drive means (cylinder 42 in the present embodiment) that drives the support member 41 up and down. In this embodiment, the conveying apparatus 40 is provided in the width direction (left-right direction of FIG. 2) both ends vicinity of a press die, for example. Each conveying device 40 can be slid in the mold clamping mold opening direction of the press mold 11 (left and right direction in FIG. 1) by a driving means (not shown).

  The support member 41 supports the weight drop of the steel plate W. In the illustrated example, the support member 41 supports the steel plate W from below. Specifically, it has a bottom portion 41a with which the lower end of the steel plate W abuts and a pair of side portions 41b extending upward from both ends of the upper surface of the bottom portion 41a. The steel plate W is supported from below at the bottom 41a and supported from both sides in the horizontal direction by a pair of side portions 41b. The drive cylinder 42 can stop the support member 41 at a desired height, and is constituted by an electric cylinder, for example.

  Hereinafter, the procedure of the hot press molding method by the hot press molding facility 1 will be described. In the following description, among the lock mechanisms 13 provided in the press die 11, a lock mechanism that locks the fixed mold 11a and the first movable mold 11b is referred to as 13A, and the first movable mold 11b and the second movable mold 11c. A lock mechanism for locking is indicated by 13B, and a lock mechanism for locking the second movable mold 11c and the third movable mold 11d is indicated by 13C.

  First, a procedure for hot press forming the steel plate W1 with the fixed mold 11a and the first movable mold 11b will be described. At this time, as shown in FIG. 5, the press mold 11 locks the lock mechanisms 13B and 13C to integrate the first movable mold 11b to the third movable mold 11d, and unlocks the lock mechanism 13A. The fixed mold 11a and the first movable mold 11b are opened. And the heating apparatus 20 with which the steel plate W1 was thrown in is arrange | positioned above the space between the fixed mold | type 11a and the 1st movable mold | type 11b. At this time, the carry-in port 22a and the carry-out port 22b of the heating device 20 are sealed by the opening / closing members 26a and 26b, and the steel plate W is heated inside the sealed space. The support member 41 of the transport device 40 is disposed below the space between the fixed mold 11a and the first movable mold 11b.

  Then, as shown in FIG. 6, the support member 41 is lifted by the drive cylinder 42 (see FIGS. 1 and 2) and disposed immediately below the heating device 20. When the steel plate W1 is heated to a predetermined temperature, the opening / closing member 26b of the carry-out port 22b of the heating device 20 is opened, the heated steel plate W1 is lowered by its own weight, and supported by the support member 41 of the transport device 40 from below. In this state, the support member 41 is lowered by the drive cylinder 42, and the steel plate W1 is disposed in the space (forming position) between the fixed mold 11a and the first movable mold 11b as shown in FIG. The heating device 20 from which the steel plate W1 has been unloaded closes the opening / closing member 26b of the carry-out port 22b, opens the opening / closing member 26a of the carry-in port 22a, and a new steel plate W2 is introduced from the carry-in port 22a. And the opening-and-closing member 26a of the entrance 22a is closed, the heating apparatus 20 is sealed, and the heating of the steel plate W2 is started.

  Thereafter, as shown in FIG. 8, the hydraulic cylinder 18 (see FIG. 1) is driven to drive the first to third movable molds 11b to 11d integrally to the left side in the drawing, and the fixed mold 11a and the first movable mold 11b. And mold. Thereby, while the steel plate W1 is shape | molded by the predetermined shape, cooling (hardening) of the steel plate W1 is started by contact with metal mold | die 11a, 11b. At this time, the support member 41 of the transport device 40 is accommodated in a space formed by the recess 14 of the fixed mold 11a and the recess 14 of the first movable mold 11b. Thereby, press molding can be performed in a state where the steel plate W <b> 1 is supported by the support member 41. Note that the lower end of the steel plate W1 is not formed immediately after the start of forming because the lower end of the steel plate W1 is arranged in the space formed by the concave portion 14, but the upper and lower ends of the steel plate W1 are drawn toward the center side as the forming proceeds, so that the steel plate is finally formed. The lower end of W1 is drawn upward from the space formed by the concave portion 14, and is molded by the fixed mold 11a and the first movable mold 11b. When the mold clamping is completed, the fixed mold 11a and the first movable mold 11b are locked by the lock mechanism 13A, and the support member 41 is lowered below the press mold 11 by the drive cylinder 42.

  Next, the steel plate W2 is hot-press formed with the first movable mold 11b and the second movable mold 11c. Specifically, first, as shown in FIG. 9, the lock mechanism 13B is unlocked. Accordingly, the fixed mold 11a and the first movable mold 11b constitute a fixed mold, and the second movable mold 11c and the third movable mold 11d constitute a movable mold. And while opening the 1st movable mold | type 11b and the 2nd movable mold | type 11c, the heating apparatus 20 and the conveying apparatus 40 are slid, and the upper direction of the space between the 1st movable mold | type 11b and the 2nd movable mold | type 11c, respectively. And placed below. Then, the steel plate W2 is formed into a predetermined shape as shown in FIG. Further, through the same process using the second movable mold 11c and the third movable mold 11d, the steel plate W3 is formed into a predetermined shape as shown in FIG.

  Thus, while the steel plates W2 and W3 are being formed, the initially formed steel plate W1 is sufficiently cooled and quenched. And as shown in FIG. 12, the heating apparatus 20 and the conveying apparatus 40 are arrange | positioned at the upper direction and the downward direction of the shape | molded steel plate W1, respectively. In this state, the lock mechanism 13A is unlocked, and the first to third movable molds 11b to 11d are integrally slid by the hydraulic cylinder 18 (see FIG. 1), whereby the fixed mold 11a and the first movable mold 11b are Open the mold (see arrow). Then, the formed steel plate W1 falls due to its own weight and is supported from below by the support member 41 (see FIG. 13). When the support member 41 is lowered in this state, as shown in FIG. 14, the formed steel sheet W1 is placed on the belt 31 of the discharge device 30 and discharged to the outside of the hot press forming facility 1. . Then, the hot press molding of the heated steel plate W4 is performed by performing the processes of FIGS.

  Thereafter, similarly, the steel plate W2 formed by the first movable mold 11b and the second movable mold 11c is discharged from the hot press forming facility 1, and a new steel plate is hot press formed by these dies. Further, the steel plate W3 formed by the second movable die 11c and the third movable die 11d is discharged from the hot press forming facility 1, and a new steel plate is hot press formed by these dies (both not shown). ). By repeating the above steps, hot press forming of the steel sheet is sequentially performed.

  As described above, in the hot press forming facility 1 described above, all other than the lock mechanism 13 provided between a pair of adjacent molds (for example, the fixed mold 11a and the first movable mold 11b). By locking the locking mechanism 13 provided between the adjacent molds (for example, the first movable mold 11b to the third movable mold 11d), it was heated only by the fixed mold 11a and the first movable mold 11b that are not locked. The press forming of the steel plate W1 can be performed. In this case, since only one steel plate W1 is subjected to press forming, the pressing force can be reduced as compared with the case of simultaneously forming a plurality of steel plates, and the hydraulic cylinder 18 for driving the press die 11 can be downsized. Accordingly, the hot press molding facility 1 can be reduced in size.

  Moreover, after press-molding with the fixed mold | type 11a and the 1st movable mold | type 11b, the steel plate W1 is cooled and hardened by locking the locking mechanism 13 of these metal mold | dies with the state clamped. (See FIG. 9). During this time, the lock mechanism 13 of the other adjacent molds (for example, the first movable mold 11b and the second movable mold 11c) is unlocked, and another steel plate W2 can be press-formed with these molds. As described above, by performing press forming of the other steel plate W2 while the formed steel plate W1 is being cooled, a decrease in productivity can be suppressed even when the steel plates are press-formed one by one.

  Further, since the heating device 20 is provided above the press die 11 that opens the mold clamping in the horizontal direction, the steel plate W heated by the heating device 20 can be transported to the press die 11 only by being lowered. Thereby, since the conveying device 40 is sufficient to support the weight of the steel plate W (for example, having a support member that supports the steel plate W from below), the conveying device 40 is simplified, Compactness is achieved. Furthermore, by providing the discharge device 30 below the press die 11, the steel plate W formed by the press die 11 can be transported to the discharge device 30 by the same transport device 40 as described above. No equipment is required, and the equipment can be made more compact.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the mold clamping mold opening direction of the press mold 11 is set to the horizontal direction is shown. However, the present invention is not limited thereto, and for example, the mold clamping mold opening direction of the press mold 11 is set to the vertical direction. Good. In the above-described embodiment, the case where the movable mold is configured by three molds (the first movable mold 11b to the third movable mold 11d) is shown, but the present invention is not limited to this, and there are two or four movable molds. You may comprise with two or more metal mold | dies.

  Further, the transfer device 40 is not limited to the above-described embodiment, and for example, a robot arm, a feeder, or the like may be used. Moreover, in said embodiment, although the support member 41 has shown the structure which supports the steel plate W from the downward direction, it is good also as a structure which hold | maintains not only this but hold | maintaining the upper end of the steel plate W, for example. . In the above embodiment, the steel plate W formed by the press die 11 is transported to the discharge device 30 by the transport device 40. However, the present invention is not limited to this. The steel plate W formed with the opening may be freely dropped onto the discharge device 30.

W (W1 to W4) Steel plate 1 Hot press forming equipment 10 Press forming device 11 Press mold 11a Fixed mold 11b First movable mold 11c Second movable mold 11d Third movable mold 13 Lock mechanism 14 Recess 15 Fixed plate 16 Slide rail 17 Movable plate 18 Hydraulic cylinder 20 Heating device 30 Discharge device 40 Conveying device 41 Support member 42 Drive cylinder

Claims (3)

A hot press forming facility for press forming a heated steel plate,
A heating device for heating a steel plate, three or more dies arranged in series, a press dies having molding surfaces on mutually opposing surfaces of adjacent dies, and a driving means for driving the press dies A hot press forming facility comprising: a lock mechanism that locks the adjacent molds in a clamped state; and a lock control unit that controls attachment and detachment of the lock mechanism.   The press mold opens the mold in the horizontal direction, the heating device is provided above the press die, and a transport device for transporting the steel plate heated by the heating device to the press die is provided. The hot press molding equipment according to claim 1. This is a hot press forming method in which three or more dies are arranged in series, and a heated steel plate is press-formed using a press dies having forming surfaces on opposite surfaces of adjacent dies. And
After forming a steel plate with a set of adjacent molds, the set of adjacent molds is locked in a clamped state, and the other set of adjacent molds is used while maintaining this state. Hot press forming method for press forming steel sheets.

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