JP4859594B2 - Foam mold equipment - Google Patents

Description

  The present invention relates to a mold apparatus for molding a foamed product such as a vehicle seat cushion.

As shown in FIG. 6A, a general mold apparatus for molding a vehicle seat cushion is configured to rotate the lower mold 20, the upper mold 30, and the upper mold 30 in the vertical direction with respect to the lower mold 20. A hinge 40 that can be supported, and an opening / closing mechanism 50 that is disposed on the opposite side of the hinge 40 and opens and closes the upper mold 30 are provided. And after loading urethane (foaming raw material) into the lower mold | type 20, the seat cushion 100 (refer FIG.6 (B)) is shape | molded by making urethane foam in the state which closed the upper mold | type 30 and clamped.
The upper mold 30 is formed with a vent hole 39, which discharges excess gas that does not contribute to foaming and releases excessive internal pressure, thereby preventing a defective product such as lacking or a cavity from occurring in the product.

In the case of the conventional mold apparatus shown in FIG. 6A, a part of the foaming raw material leaks from the vent hole 39 for degassing at the final stage of molding, and as shown in FIG. It becomes hard. The dumpling 109 needs to be removed after molding and before the upper mold 30 is opened. This is because when the upper mold 30 is opened and the seat cushion 100 is released from the upper mold 30, it becomes an obstacle. Further, it is necessary to clean the material clogged in the vent hole 39 with a wire or the like so that the gas can be smoothly vented during the next molding.
Productivity was poor because the operation of removing the dumpling 109 and cleaning the vent hole 39 was required.

  The present invention has been made to solve the above problems, and includes a lower mold and an upper mold having molding surfaces, a main opening / closing mechanism for opening and closing the upper mold with respect to the lower mold, and the upper mold is in a closed position. In a foam mold apparatus in which a molding cavity is sometimes defined by molding surfaces of a lower mold and an upper mold, one of the upper mold and the lower mold is separated from a mold body having an opening and the mold body. A split part that opens and closes the opening of the mold body as a body, and further includes an auxiliary opening and closing mechanism that opens and closes the split part between a closed position and an open position with respect to the opening of the mold body, When the dividing portion is in the closed position, the molding surface of the one mold is constituted by the molding surface of the mold body and the dividing portion, and a gas venting gap is formed between the mold body and the dividing portion, When the split part is in the open position, the split part is outward with respect to the mold body. Kuraishi, the molding surface of the divided parts, characterized in that it retracts from the molding surface of the mold body.

According to the said structure, excess gas is discharged | emitted from the clearance gap between a type | mold main body and a division | segmentation part at the time of foam molding, and a favorable foamed product can be shape | molded by releasing excess internal pressure.
Foaming raw material enters the gaps to form burrs. Since this gap extends linearly, a sufficient amount of gas can be discharged even if it is narrow. Therefore, it is possible to prevent the foam material from leaking from the gap and swell and solidify, and the removal work can be omitted.
Moreover, since the divided part can be opened by being displaced outward after molding, the burr can be separated from the mold without affecting the molded foamed product. Moreover, since no material is left in the gap, cleaning of the gap before the next molding can be omitted or simplified.

Preferably, when the dividing portion is in the closed position, the gap is formed over the entire periphery of the opening periphery of the mold body and the outer periphery of the dividing portion, and the opening has a narrow opening area inward. And the outer peripheral edge of the divided portion has a tapered surface corresponding to the tapered surface of the opening periphery, and the tapered surface of the opening periphery and the taper of the outer periphery of the divided portion at the closed position of the divided portion. The surface faces through the gap.
According to this configuration, it is possible to secure the maximum length of the gap and further narrow the gap. Further, when the divided portion is opened after molding, the divided portion can be easily separated from the burr.

Preferably, the upper mold is constituted by the mold main body and a division part, and before the main opening / closing mechanism opens the upper mold, the auxiliary opening / closing mechanism opens the division part, and the main opening / closing mechanism turns the upper mold into the lower mold. A clamping means for clamping the mold, the mold clamping state by the clamping means is released after foam molding, and then the upper mold is moved upward. The auxiliary opening / closing mechanism is installed in the upper mold Including a cooperating member fixed to the clamp means, and when the clamp means is operated to release the mold clamping after foam molding, the cooperating member is displaced, and the displacement of the cooperating member causes the dividing portion to open. Do.
According to the above configuration, since the burr formed in the gap is released by the opening operation of the dividing portion, the burr is easily separated from the mold body when the upper mold is opened. Thus, the burr does not become a resistance when the foamed product leaves the upper mold, and the foamed product can be released without being damaged. Further, since the clamping means and the auxiliary opening / closing mechanism can be interlocked, a driving means for the auxiliary opening / closing mechanism is not required, and the configuration of the mold apparatus can be simplified.

Preferably, the clamp means is provided in a fixing system including a clamp arm having an intermediate portion rotatably connected to an upper die body, a locking portion provided at a lower end of the clamp arm, and a lower die. The mold is clamped by locking the locking part to the receiving part, and the clamping state is released by rotating the clamp arm and removing the locking part from the receiving part. The auxiliary opening / closing mechanism has an operating arm and a biasing member in addition to the cooperation member, and one end of the operating arm is connected to the mold body so as to be rotatable in the vertical direction. The split portion is supported by an intermediate portion, the urging member is disposed between the mold body and the operating arm to urge the operating arm upward, and the linkage member is fixed to the clamp arm, When the lower end touches the operating arm The operating arm is pressed against the biasing member, and when the clamp arm is rotated to release the mold clamping, the lower end of the cooperation member is displaced upward, and the operating arm is moved by the biasing member. As a result, the divided portion is displaced from the closed position to the open position.
According to this structure, the structure can be simplified by comprising an auxiliary | assistant opening / closing mechanism with a cooperation member, an action | operation arm, and a biasing member.

  When the vehicle seat cushion is foam-molded using the above-described foam-molding mold apparatus, the seat cushion is mounted on the seat frame while leaving burrs. At this time, the burrs are directed to the seat frame to be crushed by the seat cushion and the seat frame. In this way, the work of removing the burrs from the seat cushion can be omitted.

  ADVANTAGE OF THE INVENTION According to this invention, a favorable foamed product can be shape | molded, improving productivity.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a mold apparatus for molding a seat cushion (foamed product). The mold apparatus includes a base 10, a lower mold 20 fixed to the upper end of the base 10, an upper mold 30 disposed above the lower mold 10, and the upper mold 30 as a lower mold 20. On the other hand, a hinge 40 that is pivotably connected in the vertical direction and a main opening / closing mechanism 50 that opens and closes the upper die 30 with respect to the lower die 20 are provided.

The lower mold 20 and the upper mold 30 have molding surfaces 20x and 30x that face each other. In the clamped state, the molding cavities S are defined by the molding surfaces 20x and 30x.
As shown in FIG. 1, the hinge 40 connects the right end of the upper mold 30 to the right end of the lower mold 20. A rotation fulcrum of the upper mold 30 is indicated by a symbol R1 in FIG.

  The main opening / closing mechanism 50 is disposed on the opposite side of the hinge 40, and includes a support 51 fixed to the left end portion of the upper mold 30 and a clamp arm 52 whose intermediate portion is rotatably supported by the support 51. A locking roller 53 (locking portion) rotatably provided at the lower end portion of the clamp arm 52, a gripping roller 54 provided at the upper end portion of the clamp arm 52, and the gripping roller 54 And a driving means 55 for rotating the clamp arm 52 and the upper mold 30. In FIG. 1, the rotation fulcrum of the clamp arm 52 is denoted by reference symbol R2.

  A receiving portion 56 for receiving the locking roller 53 is provided on the base 10 so as to protrude. The clamp arm 52, the locking roller 53, and the receiving portion 56 constitute a clamping means 59. The receiving portion 56 may be provided on the lower mold 20.

The above-described configuration is a known one, and the same numbers as those of the conventional mold apparatus shown in FIG. 6 are used.
Next, features of the present invention will be described. As shown in FIG. 1, the upper mold 30 includes a mold main body 31 and a dividing portion 32. The mold body 31 has, for example, a rectangular opening 31a. The dividing portion 32 has a shape corresponding to the opening 31a, that is, a rectangle, and substantially closes the opening 31a at a closed position described later. The mold body 31 and the divided part 32 have respective molding surfaces 31x and 32x, and at the closed position of the divided part 32, the molding surfaces 31x and 32x cooperate to form the molding surface 30x of the upper mold 30. is doing.

  As shown in FIGS. 1 and 3A, the periphery of the opening 31a of the mold body 31 has four flat tapered surfaces 31y, and the area of the opening 31a is directed inward (molding surface). It is gradually smaller (toward 31x). Correspondingly, the outer peripheral edge of the dividing portion 32 also has four flat tapered surfaces 32y.

  The dividing portion 32 is slightly narrower than the opening 31a of the mold body 31, and therefore, as shown in FIG. 3A, in the closed state of the dividing portion 32, between the peripheral edge of the opening 31a and the outer peripheral edge of the dividing portion 32. The gap G is formed over the entire circumference. The tapered surfaces 31y and 32y are substantially parallel to each other and face each other through the gap G. The gap G appears as a rectangular line between the molding surface 31x of the mold body 31 and the molding surface 32x of the divided portion 32. The gap G is smaller than the diameter of the vent hole 39 of the conventional apparatus and is less than 1 mm.

  Further, as shown in FIG. 1, the mold apparatus includes an auxiliary opening / closing mechanism 60 that opens and closes the dividing portion 32 with respect to the mold body 31. The auxiliary opening / closing mechanism 60 has a long plate-like operating arm 61 that fixes the dividing portion 32 at an intermediate portion, and a right end portion (end portion on the hinge 40 side) of the operating arm 61 as a bracket 41 (and thus a mold body 31). A support 62 that is rotatably supported, a compression coil spring 63 (biasing member) that urges the operating arm 61 upward, and a linkage member 64 that has an upper end fixed to the clamp arm 52 of the main opening / closing mechanism 50. And have. A rotation fulcrum of the operating arm 61 with respect to the mold body 31 is indicated by a symbol R3 in FIG.

  A support pin 65 protrudes from the upper surface of the left end portion of the upper mold 30, and this support pin 65 penetrates the operating arm 61. The coil spring 63 is wound around the support pin 65 and is interposed between the mold body 31 and the operating arm 61.

  The linkage member 64 is inclined so as to proceed to the left in the downward direction, and a lower end portion of the cooperation member 64 hits the upper surface of the left end portion of the operating arm 61 via the roller 66, and the operating arm 61 is opposed to the coil spring 63. And hold it down.

  Next, the operation of the mold apparatus will be described. After filling the lower mold 20 with urethane (foaming raw material), the main opening / closing mechanism 50 is operated to bring the upper mold 30 into the mold clamping state shown in FIG. In this state, the clamp arm 52 of the main opening / closing mechanism 50 is in a substantially vertical state, the locking roller 53 is locked to the lower surface of the receiving portion 56, and the peripheral portion of the upper die 30 is connected to the peripheral portion of the lower die 20. Upon hitting, a molding cavity S is formed.

  The urethane foams by the heat of the lower mold 20 and the upper mold 30, expands in the molding cavity S, and is molded by the molding surfaces 20x and 30x. As a result, the seat cushion 100 as a foamed product is obtained. Since the gas that does not contribute to the foaming is discharged from the gap G between the mold body 31 and the dividing portion 32, an excessive internal pressure can be released. Then, a part of the raw material foamed at almost the final stage of molding enters the gap G and remains as a burr 101 as shown in FIG. In addition, since the gap G for degassing is linear and narrow, the foaming raw material is not ejected from the gap G to be in a dumpling state.

  After the molding, with the driving means 55 of the main opening / closing mechanism 50 gripping the gripping roller 54, as shown in FIG. 2 (A), the clamp arm 52 is rotated in the clockwise direction in FIG. By rotating, the locking roller 53 is removed from the receiving portion 56 to release the mold clamping state. Further, as shown in FIG. 2B, the upper mold 30 is opened by rotating the upper mold 30 clockwise about the rotation fulcrum R1.

  The auxiliary opening / closing mechanism 60 also operates in conjunction with the mold clamping release operation of the main opening / closing mechanism 50. That is, when the clamp arm 52 rotates about the rotation fulcrum R2, the linkage member 64 fixed to the clamp arm 52 falls down, and the roller 66 at the lower end thereof is displaced upward. Along with this, the operating arm 61 is rotated upward about the rotation fulcrum R3 by the urging force of the compression coil spring 63, and the divided portion 32 fixed to the operating arm 61 is displaced upward, so that the opening of the die body 31 is opened. Open 31a. See FIGS. 2A and 3C.

  When the dividing portion 32 is displaced upward as described above, the tapered surface 32y of the dividing portion 32 is separated from the burr 101, and the burr 101 is sandwiched between the tapered surface 31y of the mold body 31 and the tapered surface 32y of the dividing portion 32. Released from.

  When the upper mold 30 is rotated around the rotation fulcrum R1 after the mold clamping is released and the dividing portion 32 is opened, the seat cushion is provided with an undercut at the peripheral edge of the lower mold 20. 100 remains in the lower mold 20, and the burr 101 in the released state leaves the tapered surface 31 y of the mold body 31 while being elastically deformed. See FIGS. 2B and 3D. Since the burr 101 is thin and in a released state, it is easily elastically deformed and can be separated from the tapered surface 31y of the mold body 31 without a large resistance. Therefore, the seat cushion 100 is not damaged when it is released from the upper mold 30.

  Finally, the molded seat cushion 100 is removed from the lower mold 20. As shown in FIG. 4, burrs 101 remain on the seat cushion 100.

  In the formation of the seat cushion 100, the dumpling 109 as in the conventional apparatus is not formed, so that the removing operation is unnecessary. Further, the gap G in which the burr 101 is formed is widened by the opening operation of the dividing portion 32, and the burr 101 is separated from the upper mold 30 during the opening operation of the upper mold 30, so that it is not necessary to clean the gap G. As a result, productivity can be improved.

  Since the periphery of the opening 31a of the mold body 31 and the outer periphery of the dividing portion 32 are tapered surfaces 31y and 32y, the dividing portion 32 can be easily separated from the periphery of the opening 31a and the burr 101. In addition, by using the tapered surfaces 31y and 32y, for example, the dimension of the gap G can be easily adjusted by adjusting the angle of the cooperation member 64 or the like.

  The seat cushion 100 is attached to the seat frame 200 (frame) as shown in FIGS. 5A and 5B with the burr 101 left. At this time, since the burr 101 is directed downward (directed toward the seat frame 200), it is crushed by the seat frame 200. Since the burr 101 is not disposed on the upper surface on which the occupant sits, the burr 101 does not adversely affect the sitting comfort.

The present invention is not limited to the above embodiment, and various aspects can be adopted. For example, the auxiliary opening / closing mechanism may not be linked to the main opening / closing mechanism. The main opening / closing mechanism may be a lifting type instead of a rotating type.
The opening of the mold body may be circular or the like. In this case, the peripheral edge of the opening and the tapered surface of the dividing portion are conical surfaces.
The lower mold can also be composed of a mold main body and a divided part. In this case, the opening operation of the dividing portion may be performed after the operations of releasing the clamp and opening the upper mold.
The present invention can be applied to a mold apparatus for molding a foamed product other than a seat cushion, and can also be applied to foam molding of any material such as styrene and rubber in addition to urethane.

It is a longitudinal cross-sectional view of the foam molding die apparatus which makes one Embodiment of this invention. It is the longitudinal cross-sectional view of the left half of the metal mold | die apparatus, (A) shows a mold clamping cancellation | release state, (B) shows the state in the middle of an upper mold opening operation | movement. It is sectional drawing which expands and shows a part of mold main body and a division part of the mold apparatus, (A) shows the state of mold clamping before molding, (B) shows the state immediately after molding, (C) Indicates a state in which the dividing portion is opened, and (D) indicates a state in which the upper die is opened. It is a perspective view which shows the seat cushion with a burr | mold formed by foaming. It is a longitudinal cross-sectional view of a seat cushion and a seat frame, (A) shows the state before mounting | wearing a seat cushion to a seat frame, (B) shows the state after mounting | wearing. It is a longitudinal cross-sectional view which shows the conventional mold apparatus for seat cushion foam molding.

Explanation of symbols

20 Lower mold 20x Molding surface 30 Upper mold 30x Molding surface 31 Mold body 31a Opening 31x Molding surface 31y Tapered surface 32 Dividing part 32x Molding surface 32y Tapered surface 50 Main opening / closing mechanism 52 Clamp arm 53 Locking roller (Locking part)
56 Receiving part 59 Clamping means 60 Auxiliary opening / closing mechanism 61 Actuating arm 63 Coil spring 64 Cooperation member 100 Seat cushion (foamed product)
101 Burr 200 Seat frame R1, R2, R3 fulcrum

Claims (2)

A lower mold and an upper mold having molding surfaces, and a main opening / closing mechanism that opens and closes the upper mold with respect to the lower mold. When the upper mold is in the closed position, a molding cavity is defined by the molding surfaces of the lower mold and the upper mold. In the foam molding die device designed to
The main opening / closing mechanism includes a clamping unit for clamping the upper die to the lower die, and after the foam molding, the upper die is moved upward after releasing the clamping state by the clamping unit.
The upper die, when in the mold body having an opening, and a division unit for opening and closing the opening of the mold body to form the mold body and separately, to the division unit is a closed position, split the die body The molding surface of the upper mold is constituted by the molding surface of the part ,
The peripheral edge of the opening of the mold body has a tapered surface such that the area of the opening becomes narrower inward, and the outer peripheral edge of the divided portion has a tapered surface corresponding to the tapered surface of the peripheral edge of the opening. In the closed position of the part, a gap for degassing is formed over the entire circumference between the tapered surface of the peripheral edge of the opening and the tapered surface of the outer peripheral edge of the divided part ,
Furthermore, an auxiliary opening / closing mechanism that opens and closes the divided portion with respect to the opening of the mold body between a closed position and an open position is provided, and the auxiliary opening / closing mechanism is installed on the upper mold and is fixed to the clamping means. When the clamp means is operated to release the mold clamping after foam molding, the linkage member is displaced, and the displacement of the linkage member causes the main opening / closing mechanism to open the upper die. the dividing portion is displaced outwardly with respect to the mold body, the molding surface of the dividing section so as to retract from the molding surface of the mold body, and performs the opening operation of the division section foam Molding equipment. The clamp means includes a clamp arm having an intermediate portion rotatably connected to an upper die body, a locking portion provided at a lower end of the clamp arm, and a receiver provided in a fixed system including a lower die. The mold is clamped by locking the locking part to the receiving part, and the clamping state is released by rotating the clamp arm and removing the locking part from the receiving part. And
The auxiliary opening / closing mechanism has an operating arm and a biasing member in addition to the linkage member, and one end of the operating arm is connected to the mold body so as to be rotatable in the vertical direction, and the divided portion is supported by an intermediate portion of the operating arm. The biasing member is disposed between the mold body and the working arm to bias the working arm upward,
The cooperation member is fixed to the clamp arm, and the lower end of the cooperation member hits the operation arm, thereby pressing the operation arm against the biasing member,
When the clamp arm is rotated to release mold clamping, the lower end of the cooperation member is displaced upward, and accordingly, the operating arm is displaced upward by the urging member. As a result, the dividing portion opens from the closed position. 2. The foam mold apparatus according to claim 1 , wherein the foam mold apparatus is displaced to a position.

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