JP2019030987A - Injection molding machine and block of injection molding machine - Google Patents

Abstract

To provide an injection molding machine that can achieve a weight reduction, and a block that can achieve a weight reduction.SOLUTION: The present invention provides an injection molding machine 11 in which a die 15, 18 for molding a molding is fitted to a block, where sides of counter die fitting surfaces 29, 43 of a metal block (fixing block 30, movable block 42) are a bonded with resin members containing carbon fiber.SELECTED DRAWING: Figure 1

Description

The present invention relates to an injection molding machine in which a mold for molding a molded product is attached to a base, and a base for an injection molding machine in which a mold for molding a molded product is attached.

In an injection molding machine, a mold is attached to a base plate, and a molded product is molded by injecting molten resin into the mold from an injection device. More specifically, the fixed mold is attached to the fixed platen, and the movable mold is attached to the movable platen. When the molded product to be molded is changed, the mold attached to the base plate of the injection molding machine is also exchanged accordingly.

Conventionally, a base (mold) of an injection molding machine is manufactured from a metal material such as steel or cast iron such as spheroidal graphite cast iron as disclosed in Patent Document 1. Since these pedestals have a certain thickness or more due to the relationship of receiving the force at the time of mold clamping, the ratio of the metal pedestal to the weight of the injection molding machine was very large. In particular, in a large-sized injection molding machine, even if each part is disassembled and shipped, a heavy platform may become a bottleneck in transportation and installation.

The thing described in patent document 2 is known as what respond | corresponds to the problem that the weight of the said baseboard becomes a bottleneck in the case of transportation and installation. In Patent Document 2, a board on which a mold clamping cylinder such as a fixed board is disposed is divided into an outer frame portion through which a tie bar is inserted and a mold mounting board, thereby reducing the weight of each board.

JP-A-4-147799 (right column on page 1) JP 2013-244740 A (Claims 1, 0003, 0006, 0017, 0019)

However, as for the thing divided | segmented into the base plate like patent document 2, since each base plate is a product made from cast iron (made of metal), the weight of the injection molding machine including the whole base cannot be reduced. There was a problem. Accordingly, an object of the injection molding machine of the present invention is to provide an injection molding machine capable of reducing the weight and a base plate capable of reducing the weight.

The injection molding machine according to claim 1 of the present invention is an injection molding machine in which a mold for molding a molded product is attached to a base plate, and includes carbon fibers on the side opposite to the mold mounting surface of the metal base plate. A resin member is joined.

The injection molding machine according to claim 2 of the present invention is an injection molding machine in which a mold for molding a molded product is attached to a base plate, and includes carbon fibers between rib portions of the metal base plate. A resin member is joined.

An injection molding machine according to a third aspect of the present invention is the injection molding machine according to the first or second aspect, wherein the anti-mold mounting surface side of the metal base plate provided with the clamping cylinder or between the rib portion and the rib portion. A resin member containing carbon fiber is bonded to the substrate.

The base plate according to claim 4 of the present invention is a base plate for an injection molding machine to which a mold for molding a molded product is mounted. A resin member containing carbon fibers is bonded between the two.

The injection molding machine of the present invention is an injection molding machine in which a mold for molding a molded product is attached to a base plate
Since the resin member containing carbon fiber is joined to the metal mold base on the side opposite to the die mounting surface, the weight of the injection molding machine can be reduced. Similarly, the weight of the base plate can be reduced for the base plate of the injection molding machine to which the mold for molding the molded product of the present invention is attached.

It is explanatory drawing which shows the injection molding machine of this embodiment. It is the side view which looked at only the stationary disk of the injection molding machine of this embodiment from the injection device side. It is the side view which looked only at the stationary platen of the injection molding machine of 2nd Embodiment from the injection device side. It is an arrow line view of the AA line of the stationary platen of 2nd Embodiment.

The injection molding machine 11 of this embodiment is demonstrated with reference to FIG. In FIG. 1, the part above the A line is the longitudinal section of the part of the clamping cylinder, the part between the A line and the B line is the longitudinal section of the center line of the clamping device, and the part below the B line is A front view is shown. FIG. 1 is also an arrow view taken along the line AA of the one-dot chain line in FIG. In the mold clamping device 12 of the injection molding machine 11, a fixed plate 16 is fixed to one side on a bed 13, and a fixed die 15 is attached to a mold attachment surface 14 of the fixed plate 16. A movable plate 19 is disposed on the other side of the bed 13 so as to be reciprocally movable in a mold opening / closing direction by a mold opening / closing mechanism 20. A movable mold 18 is mounted on the mold mounting surface 17 of the movable platen 19. In the present invention, the fixed platen 16 and the movable platen 19 each correspond to a base plate. The fixed mold 15 and the movable mold 18 correspond to molds for molding a molded product with the cavity C formed when the molds are matched.

Clamping cylinders 21 are attached in the vicinity of the four corners of the stationary platen 16, and a rod fixed to the piston of the clamping cylinder 21 is a tie bar 22. The tie bars 22 are respectively inserted in the vicinity of the four corners of the movable platen 19. An engagement groove 23 is formed at a predetermined position on the outer periphery of the tie bar 22 over a predetermined length in the mold opening / closing direction, while the surface of the movable plate 19 on the side opposite to the mold mounting surface is engaged with and disengaged from the engagement groove 23. A half nut 24 is provided. A ball screw nut 25 of a mold opening / closing mechanism 20 is fixed to the movable platen 19, and a servo motor 26 of the mold opening / closing mechanism 20 is fixed on the bed 13. A ball screw 27 connected to the servo motor 26 by a pulley or a belt is rotatably supported on the bed 13, and the ball screw 27 is inserted through the ball screw nut 25.

An injection device 28 is disposed on the bed 13 on the side opposite to the mold mounting surface of the fixed platen 16. The nozzle touch mechanism of the injection device 28 is attached so as to connect the injection device 28 and the stationary platen 16. As an example, the injection molding machine 11 using the above-described mold clamping cylinder 21 is widely used in large machines having a mold clamping force of 10,000 KN or more.

Next, the fixed platen 16 which is a base plate provided with the mold clamping cylinder 21 of the present embodiment will be described. The stationary platen 16 is integrally formed by joining a resin member 31 containing carbon fiber to the anti-mold mounting surface 29 side of the metal base plate 30. In the present embodiment, the metal platform 30 is made of cast iron such as spheroidal graphite cast iron (FCD material). However, another metal base such as steel such as SS400 and S45C may be used. As shown in FIGS. 1 and 2, the metal base 30 includes a plate body portion 32 having a die mounting surface 14, a mold clamping cylinder built-in portion 33 in the vicinity of the four corners, and a central die indicated by a broken line. A mortar portion 34 that also serves as a reinforcement on the back side, an outer peripheral rib portion 35 that connects the clamping cylinder built-in portion 33 to each other, a radial rib portion 36 that connects the clamping cylinder built-in portion 33 and the mortar portion 34, and an outer peripheral rib It consists of a radial rib portion 37 and the like for connecting the portion 35 and the mortar portion 34. The rib portions 35, 36, and 37 are all erected and fixed from the plate body portion 32 toward the anti-mold mounting surface side (the injection device 28 side). The shape of the rib portion of the stationary platen 16 is not limited to the above, but the height of the rib portion is increased to increase the thickness of the stationary platen 16 to reduce the weight, but the weight of the stationary platen 16 during mold clamping is reduced. Can counter warpage. In the present invention, the force generated at the time of mold clamping is received by both the metal base 30 and the resin member 31 containing carbon fiber, which will be described later. The thickness of the rib portions 35, 36, and 37 can be reduced, and the weight can be reduced.

A part of the mold clamping cylinder built-in portion 33, the outer peripheral rib portion 35, and the radial die portions 36 and 37 are formed at the same height on the anti-mold mounting surface 29. And the resin-made member 31 containing carbon fiber is joined to the anti-die attachment surface 29 formed from those rib parts. In the large-sized injection molding machine 11 in which the clamping cylinders 21 are provided in the vicinity of the four corners of the stationary platen 16 as in the present embodiment, the resin member 31 containing carbon fiber covers the entire surface of the stationary plate mounting surface of the stationary platen 16. In many cases, it is difficult to form a member to be covered with one sheet. Therefore, in this embodiment, the resin member 31 containing carbon fibers is composed of resin members 38, 39, 40, and 41 containing a plurality of carbon fibers.

First, the upper and lower mold clamping cylinder built-in portions 33, 33 on the right side are connected, and the length of one side is a substantially rectangular surface shape that is longer than the length of the other side, and is made of resin containing carbon fibers having a predetermined thickness. The member 38 is attached. The corners of the member 38 may be chamfered in a circular shape in accordance with the outer shape of the metal base 30 but may not be chamfered. The member 38 is formed with through holes in the vicinity of both ends for inserting the mold clamping cylinder built-in portion 33. Also, the upper and lower mold clamping cylinder built-in portions 33, 33 on the right side are connected by a member 38 having the same shape and a predetermined thickness. Further, these members 38, 38 are joined to the anti-mold mounting surface 29 such as the mold clamping cylinder built-in portion 33 of the metal base plate 30 and the anti-mold mounting surface 29 such as the outer peripheral rib portion 35 with bolts (not shown). This is done with at least one of the adhesives. However, it is possible to use fitting between members, and the joining method is not limited including other members. Accordingly, the term “joining” in the present invention is a broad concept including fixation and contact.

Next, the upper left and right mold clamping cylinder built-in portions 33 and 33 are connected, and the length of one side is a substantially rectangular surface shape longer than the length of the other side, and is made of resin containing carbon fiber having a predetermined thickness. The member 39 is attached. The corners of the member 39 may have any shape. The member 39 is formed with through holes in the vicinity of both ends for inserting the mold clamping cylinder built-in portion 33. Similarly, the lower left and right mold clamping cylinder built-in portions 33 and 33 are similarly connected in a belt shape with the member 39 having a predetermined thickness. The joining method with the metal base plate 30 or the other member 38 is not limited as in the joining method of the member 38.

Further, the upper right mold clamping cylinder built-in portion 33 and the lower left mold clamping cylinder built-in portion 33 are connected by a resin member 40 having a long and substantially rhombus surface shape and containing carbon fibers of a predetermined thickness. The member 40 is formed with through holes in the vicinity of both ends for inserting the mold clamping cylinder built-in portion 33. Further, a through hole for inserting the mortar portion 34 is formed in the central portion where the width of the member 40 is thick. Further, a resin member 41 containing carbon fiber having the same shape as the member 40 is attached so as to connect the upper left clamping cylinder built-in portion 33 and the lower right clamping cylinder built-in portion 33. The members 40 and 41 are not limited to joining to the metal base 30 or the other members 38 and 39.

The resin members 38, 39, 40, and 41 including these carbon fibers are not limited to this, but are 5 to 50 mm as an example. Accordingly, four pieces are joined by bolts or the like in the portion of the mold clamping cylinder built-in portion 33, but the heights of the bottom surfaces of the members 38, 39, 40, and 41 are different in other portions. Therefore, the height of the outer peripheral rib portion 35 of the metal base plate 30 and the anti-mold mounting surface 29 of the radial rib portions 36 and 37 may be changed according to the height of the bottom surface. Further, as shown by a member 69 in FIG. 1, a block 70 may be sandwiched between the members 38 and 41. Furthermore, a thick portion and a thin portion may be provided on at least one of the members 38, 39, 40, and 41. Further, the resin member 31 containing carbon fiber may be composed only of the members 38 and 39 or may be composed only of the members 40 and 41.

In the present embodiment, the rib portion and the rib surrounded by the outer peripheral rib portion 35 and the radial rib portions 36 and 37 on the side opposite to the mold mounting surface (rear surface side) of the plate body portion 32 of the metal base plate 30. Part or all of the concave portions between the portions may be filled with a resin member containing carbon fiber. Further, it is not excluded to add a resin member including carbon fiber on the mold mounting surface 14 side for the purpose of preventing distortion at the time of mold clamping. In this case, the resin member containing carbon fiber is a plate-like body having one surface serving as a mold mounting surface, and the thickness is not limited to this, but is preferably about 3 to 40 mm. A plurality of through holes for attaching a mold are formed in the member made of the plate-like body. As described above, in the present embodiment, the resin plate 38, 39, 40, 41 including a plurality of carbon fibers is joined to the metal base plate 30 to form the fixed plate 16.

In the fixed platen 16, the metal platen 30 and the resin member 38 containing carbon fibers are integrated to counter the mold clamping force during mold clamping. More specifically, the warping direction of the fixed platen 16 during mold clamping can be suppressed by the resin member 31 mainly containing carbon fibers. As an example, the increased weight of the resin base plate 30 including carbon fibers with respect to the reduced weight of the metal base plate 30 can be 10 to 30% as an example. This is based on the fact that the specific strength of the resin containing carbon fiber to iron is 10 times or more and the specific elastic modulus is 7 times or more.

As a result, particularly in a large machine exceeding the clamping force of 25,0000 Kn, the stationary platen 16 provided with the clamping cylinder 21 has a problem in the weight during transportation even if only the base plate is used, but it can be reduced by about 5 to 30%. It contributes to alleviating problems during transportation. Since the resin containing carbon fiber is more expensive than cast iron at the present time, the thickness of the resin member containing carbon fiber should be determined based on the weight of the entire base plate being a weight that does not cause a problem during transportation. It may be.

Next, a method for manufacturing the resin members 38, 39, 40, and 41 containing carbon fibers will be described. In the present embodiment, a plurality of prepregs obtained by impregnating a carbon fiber with one direction of a fiber with a thermosetting resin such as epoxy impregnated with a matrix resin are stacked and laminated by changing the direction of the fiber by 90 °. Lamination molding is performed by the RTM method (resin transfer molding) or the autoclave method. In the case where the mold clamping cylinders 21 are arranged evenly on each side, the member 38 and the member 39, and the member 40 and the member 41 have the same shape, so that the mold of the RTM method can be shared. After the lamination molding, curing is performed by a method such as sintering. The thickness of the plate body in these laminated moldings is generally 1 to 30 mm, and is at most about 40 mm due to problems such as evacuation, and if it exceeds this, molding becomes difficult. Accordingly, the resin member 38 containing carbon fiber may be formed by joining a plurality of plate bodies formed by the above-described forming method with an adhesive or bolts when a certain thickness or more is required. .

In the above, the prepreg may be one in which carbon fibers in the vertical direction and the horizontal direction are folded from the beginning, or one using a nonwoven fabric. Alternatively, a sheet made of only carbon fibers may be impregnated with a resin during molding. Further, the type of the matrix resin is not limited, and the matrix resin may be a part or all of the thermoplastic resin. The carbon fiber may be a PAN-based fiber or a pitch-based fiber. When a PAN-based fiber is used, the tensile strength is excellent, and when a pitch-based carbon fiber is used, the tensile elastic modulus is excellent in that the value is close to that of iron. Moreover, although this embodiment uses carbon fiber, it does not exclude all other reinforcing fibers. In the present embodiment, the resin member containing carbon fibers is a flat plate (with attachment holes) from the viewpoint of moldability, but may be a complicated shape having ribs and the like.

Next, the movable platen 19 will be described. Similarly to the fixed platen 16, the movable platen 19 is provided with a resin member 44 including a plurality of carbon fibers on the side opposite to the die mounting surface 43 of the metal base plate 42. Also in the movable platen 19, rib portions such as the outer peripheral rib portion 46 and the radial rib portion 47 are formed so as to connect the upper and lower tie bar insertion portions 45 of the metal base plate 42. Then, in parallel to the anti-mold mounting surface 43 of the rib portion, the resin members 4, 48, 48 including carbon fibers and the carbon fibers that connect the left and right tie bar insertion portions 45 in a form that connects the upper and lower tie bar insertion portions 45. The resin members 50 and 50 including carbon fibers are attached so as to connect the resin members 49 and 49 and the tie bar insertion portion 45 in the oblique direction. The members 50 and 50 are not provided with through holes for inserting the mortar portion 34 like the resin members 40 and 41 including carbon fibers on the fixed platen side, but an ejector device (not shown) is attached. For example, a through hole is formed. Other than the above differences, the shape, thickness, mounting method, manufacturing method, and the like of the members 48, 49, 50 are substantially the same as those of the resin members 38, 39, 40, 41 including carbon fibers on the stationary platen 16 side. The description is omitted because it is the same.

In the case where the movable platen 19 is a platen provided with a clamping cylinder, joining the resin member 44 containing carbon fiber to the metal platen 42 solves the problem of conveyance. In the present invention, the resin members 31 and 44 containing carbon fibers may be employed in at least one of the fixed platen 16 and the movable platen 19.

Next, the operation of the injection molding machine 11 will be described. The movable platen 19 is closed by the mold opening / closing mechanism 20, and the fixed mold 15 and the movable mold 18 are closed. At this time, a resin member 44 containing carbon fiber is used in at least a part of the movable platen 19 to reduce the weight, so that energy in mold opening / closing (in the case where the mold opening / closing mechanism is the servo motor 26, power consumption) ) Is reduced. Alternatively, the mold opening / closing speed can be improved and the molding cycle can be shortened. Furthermore, there may be a case where a mold opening / closing servo motor having a small capacity can be employed, compared to the case where a metal-only movable plate is used.

When the fixed mold 15 and the movable mold 18 are closed, the half nut 24 is operated, and then the mold clamping cylinder 21 is operated to perform mold clamping. At this time, the tie bar 22 is pulled by the mold clamping cylinder 21, and the fixed platen 16 and the movable platen 19 are deformed and deformed. At this time, the member 15 (38, 39, 40, 41) made of resin including the metal base plate 30 and the back side carbon fiber is warped from the fixed mold 15 and the movable mold 18 so that the above-mentioned member is obtained. A force in the pulling direction is applied to 31 especially around the outer periphery. However, since the resin-made member 31 containing carbon fibers according to the present embodiment is formed by lamination using a prepreg containing directional fibers as a material, the force in the pulling direction is substantially parallel to the fiber direction, and the compression is performed. Since the directional force is substantially perpendicular to the fiber direction, the strength of the resin member 31 containing carbon fibers is maximized. And since the resin member 31 containing both carbon fibers is more applied in the tensile direction than the metal base plate 30, even if there is a difference in tensile elastic modulus between the two, the big problem is Does not occur. As described above, it is possible to make the tensile elastic modulus of the base plate 30 made of metal (made of cast iron) and the resin member 31 containing carbon fibers substantially the same by using the carbon fibers of pitch fibers as described above. . Then, injection is performed from the injection device 28 to the cavity C of the mold while the mold is clamped, and then cooling is performed.

Next, a stationary platen 53 of a mold clamping device 52 of an injection molding machine 51 according to another embodiment shown in FIGS. 3 and 4 will be described. About the injection molding machine 51 of another embodiment, since parts other than the stationary platen 51 are the same as that of FIG. 1, description is abbreviate | omitted. FIG. 3 is a view of the fixed platen 53 as viewed from the injection device 54 side. The metal base 55 of the fixed platen 53 is provided with a plate body part 58 on which a fixed mold 57 is attached to a mold attachment surface 56 and mold clamping cylinder built-in parts 59 in the vicinity of the four corners. On the mold mounting surface 60 side, a mortar portion 61 that also serves as a reinforcement on the back side of the central mold, an outer peripheral rib portion 62 for connecting the clamping cylinder built-in portions 59 to each other, and the clamping cylinder built-in portion 59 and the mortar portion. A radial rib portion 63 connected to 61, a radial rib portion 64 connecting the outer peripheral rib portion 62 and the mortar portion 61, and the like.

And the convex part 65 is formed in the anti-mold mounting surface 60 of the plate part 58 so that it may protrude toward the injection device side. Further, a convex portion 66 is formed so as to protrude from the radial rib portion 63 so as to be parallel to the mold mounting surface 56. Further, a convex portion 67 is formed so as to protrude from the radial rib portion 64 so as to be parallel to the mold mounting surface 56. Further, a convex portion 69 projects from the mold clamping cylinder built-in portion 59. These convex portions 65, 66, 67, and 69 improve the bonding between the metal base plate 55 and the resin member 68 containing carbon fiber described below, and the force exerted on the fixed platen 53 during mold clamping. Is formed not only on the metal base plate 55 but also on the resin member 68 containing carbon fibers. In addition, the shape of the rib and the convex part of the metal base plate 55 is not limited to the above.

Next, a resin member 68 including a plurality of carbon fibers attached to the metal plate 55 on the side opposite to the die mounting surface 60 of the fixed plate 53 will be described. In the present embodiment, resin members 68a and 68b containing carbon fibers in a form surrounded by the anti-mold mounting surface 60, the outer peripheral rib portion 62, the radial rib portion 63, and the radial rib portion 64 of the plate body portion 58 are provided. A total of eight are inserted and fixed. In other words, the resin member 68 containing carbon fibers is joined between the rib portions. In another embodiment shown in FIG. 3, the member 68 is of two types, including four members 68 a and four members 68 b. The members 68a and 68b are preferably attached so as to be joined and pressed to the convex portions of the metal base 55.

Next, two examples of the manufacturing method and joining method of the resin members 68a and 68b containing the carbon fiber will be described. In the first manufacturing method, the members 68a and 68b are formed by injection molding or injection molding in a dedicated mold different from the base plate, and the members 68a and 68b are fitted into the metal base plate 55. In this case, it is necessary to prepare two molds corresponding to the member 68a and the member 68b. In the case of injection molding, carbon fiber and thermoplastic resin or thermosetting resin are melted and mixed in a heating cylinder and injected into a mold to form the members 68a and 68b. Injection molding is an excellent method for mass production, but the cost of molds and the like is high.

In the injection molding including the RTM method, it is desirable to evacuate the inside of the mold, but since the pressure at the time of injection is not high, the mold clamping device or the like is often small. Those molded by injection molding or injection molding are preferably joined to the metal base plate 55 with separate bolts or fixtures after being inserted between the rib portions of the metal base plate 55. In some cases, after the members 68a and 68b are inserted, a metal plate or a resin plate containing carbon fiber shown in FIG. 1 or the like is fixed to the anti-mold mounting surface 60 of the rib portion, and the members 68a and 68b are enclosed. It may be shaped like this.

The manufacturing method of the second example is directly on the concave portion surrounded by the anti-mold mounting surface 60, the outer peripheral rib portion 62, the radial rib portion 63, and the radial rib portion 64 of the plate body portion 58 of the metal base plate 55. A molten resin material containing carbon fiber is injected and molded. In this case, a film body such as rubber having a heat resistance and an injection hole is attached to the recess, and a closed space formed by the recess and the film body is evacuated. Then, after the nozzle of the supply device is brought into contact with the injection hole, the passage from the nozzle to the injection hole is opened, and a molten resin material containing carbon fiber is injected from the supply device into the closed space. The resin material at this time may be a thermoplastic resin or a thermosetting resin.

At this time, when the height of the outer peripheral rib portion 62 is higher than the height of the radial rib portions 63 and 64, the material is injected beyond the radial rib portions 63 and 64, thereby making the resin-made carbon fiber. The number of members may be one. Moreover, when shrinkage | contraction accompanying solidification of the molten resin containing the carbon fiber injected becomes a problem, you may make it inject | pour molten material in multiple times. At this time, the weld between the materials having different injections is formed in a direction substantially perpendicular to the direction in which the force in the compression direction is applied, so that there is no problem.

The manufacturing method of the second example has an advantage that it is not necessary to prepare a mold. This is a significant advantage in the case of a large injection molding machine with a small number of shipments. Furthermore, there is a merit that a resin member 68 containing carbon fibers can be inserted regardless of the shape of the convex portions 65, 66, and 67 of the metal base plate 55. Also in the case of the second manufacturing method, the member 68 after the injection molding on the metal base 55 may be fixed to the metal base 55 with a separate bolt or fixture. In some cases, after injecting the member 68, the surface of the member 68 on the side of the injection device 54 or the anti-mold mounting surface 60 of the rib portion is made of a metal plate or a resin containing carbon fiber shown in FIG. The plate may be fixed so that the member 68 is enclosed. In both the first and second manufacturing methods, a resin plate (member) containing carbon fibers may be attached to the mold attachment surface 56 side.

The resin member 68 containing carbon fiber to the stationary platen 53 of the injection molding machine 51 shown in FIGS. 3 and 4 is made of a metal base plate 55 when the base plate is warped during mold clamping. A force in the compression direction is applied on the side of the plate body 58 near the anti-die mounting surface 60, and a force in the pulling direction is applied on the far side from the anti-die mounting surface 60. Therefore, in particular, it is necessary to perform integration by fitting convex portions or fixing bolts so that a tensile force generated on the far side from the anti-mold mounting surface 60 can be received by a resin member containing carbon fiber. is there.

The resin member 68 containing carbon fibers formed by injection molding or injection molding has a carbon fiber length of a certain length or less and has a different directionality. Therefore, the resin member 68 is laminated from the prepreg shown in FIG. It cannot be denied that the resin member 31 containing carbon fibers is inferior to the resin member 31 in terms of strength against the force in the pulling direction generated during mold clamping. Therefore, in another embodiment such as FIG. 3 and the like, the carbon fiber portion increases by about 20 to 30% with respect to the reduced weight of the metal portion of the stationary platen 53 as an example, although not limited thereto. It is assumed.

Reinforcement by joining and integrating a resin member 68 containing carbon fibers to a metal base plate 55 of a stationary plate 53 of an injection molding machine 51 of another embodiment shown in FIGS. The method can be diverted to the movable plate as well. These methods of reinforcing the fixed platen 53 and the movable platen were originally provided with a strength that can be used for mold clamping only with a metal base plate, and by further increasing the strength of the base plate, warping during mold clamping is achieved. In order to prevent the occurrence of burrs or the like in the molded product, it may be reinforced with a resin member containing carbon fiber. From the beginning of the design, a metal base and a resin member 68 containing carbon fiber are provided. The strength of the base plate may be calculated on the assumption that the fixed platen 53 is manufactured integrally.

The present invention is not enumerated one by one, but is not limited to the above-described embodiment, and those combined with the above descriptions and those modified by a person skilled in the art based on the spirit of the present invention, It goes without saying that it applies.

The injection molding machine and its base of the present invention may be those of another mold clamping device such as one using a toggle mechanism. Further, the injection molding machine and its base of the present invention may be a fixed plate or a movable plate of a vertical mold clamping device. Further, in the case where an intermediate plate in which an intermediate mold is attached between the fixed plate and the movable plate is provided, the intermediate plate also corresponds to the platform of the present invention. In the case of an intermediate plate, warpage is unlikely to occur during mold clamping, but by adopting a metal base rib structure and a resin member containing carbon fiber, the intermediate plate can be reduced in weight, The rotation speed can be improved.

11, 51 Injection molding machine 12, 52 Mold clamping device 14, 17, 56 Mold mounting surface 15 Fixed mold 16, 40, 53 Fixed plate 19 Movable plate 29, 43, 60 Anti mold mounting surface 30, 42, 55 Metal bases 31, 38, 39, 40, 41, 44, 48, 49, 50, 68, 68a, 68b Resin members containing carbon fibers

Claims (4)

In an injection molding machine in which a mold for molding a molded product is attached to a base plate,
An injection molding machine characterized in that a resin member containing carbon fiber is joined to the side of the metal mold base opposite to the mold mounting surface. In an injection molding machine in which a mold for molding a molded product is attached to a base plate,
An injection molding machine characterized in that a resin member containing carbon fibers is bonded between a rib portion of a metal base plate. The resin member containing carbon fiber is joined between the side of the anti-mold mounting surface of the metal base plate provided with the mold clamping cylinder or between the rib portion and the rib portion. The injection molding machine according to claim 2. In the base of an injection molding machine to which a mold for molding a molded product is attached,
A base plate for an injection molding machine, characterized in that a resin member containing carbon fibers is bonded to the side of a metal base plate opposite to the mold mounting surface or between the rib portion.

Images