Cover and spoon integrated injection mold

Abstract

The utility model discloses a cover and spoon integrated injection mold, which relates to the technical field of molds and comprises a front mold, a rear mold, a rear demolding component, a front airflow channel and a push ring component, a front mold core is arranged at the rear end of the front mold; a rear mold core is arranged at the front end of the rear mold, the rear mold core and the front mold core are matched to form a cavity, the cavity is used for injection molding to form a workpiece, and the workpiece comprises a cover body and a spoon body; the rear demolding assembly is arranged on the rear mold and used for pushing the workpiece to leave the rear mold core. The front air flow channel is formed in the front mold and extends to the part, forming the spoon body, of the front mold core; the push ring assembly is arranged on the front mold and can move front and back to push the cover body away from the front mold. The cover body and the spoon body can be integrally formed in an injection molding mode.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, and particularly relates to an integrated injection mold for a lid and a spoon. Background Art

[0002] At present, molds are the basic process equipment for industrial production. 75% of the rough-machined industrial product parts and 50% of the precision-machined parts are formed by molds. Most plastic products are also formed by molds. As the basic industry of the national economy, molds are involved in various industries such as machinery, automobiles, light industry, electronics, chemical industry, metallurgy, and building materials, and have a very wide range of applications. However, general molds are highly targeted and it is less likely to produce multiple products with one device. In the prior art, the common ways of carrying spoons on the market are to make a cavity on the lid and then separately process the spoon and assemble it. At least two sets of molds are required for production, and there is an additional assembly process, resulting in too high mold costs and labor costs. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides an integrated injection mold for a lid and a spoon, which can integrally injection-mold the lid and the spoon.

[0004] An integrated injection mold for a lid and a spoon according to an embodiment of the first aspect of the utility model includes: a front mold, a rear mold, a rear demolding assembly, a front air flow channel, and a push ring assembly; a front mold core is arranged at the rear end of the front mold; a rear mold core is arranged at the front end of the rear mold, and the rear mold core cooperates with the front mold core to form a cavity for injection-molding a workpiece, and the workpiece includes a lid and a spoon; the rear demolding assembly is arranged on the rear mold and is used to push the workpiece away from the rear mold core; the front air flow channel is opened in the front mold and extends to the part of the front mold core where the spoon is formed; the push ring assembly is arranged on the front mold and can move back and forth to push the lid away from the front mold.

[0005] An integrated injection mold for a lid and a spoon according to an embodiment of the utility model has at least the following beneficial effects: the spoon can be pushed away from the front mold core by the compressed air in the front air flow channel, and the lid can be pushed away from the front mold by the back-and-forth movement of the push ring assembly. Through the cooperation of the rear mold demolding assembly, the front air flow channel, and the push ring assembly, the workpiece can be assisted to be separated from the front mold and the rear mold. Compared with manual taking for demolding, it has the advantages of high demolding efficiency and can also reduce the risk of injury to the operator.

[0006] According to some embodiments of the utility model, a rear sliding groove is opened in the rear mold core, the rear demolding assembly includes a slider, and the slider is installed in the rear sliding groove so as to be movable back and forth, and the slider is used to push the spoon away from the rear mold core when the front mold and the rear mold are separated.

[0007] According to some embodiments of the present utility model, the rear demolding assembly includes an elastic member disposed at the rear end of the slider. A first push rod and a second push rod are connected to the front end of the slider. Both the first push rod and the second push rod extend out of the rear mold core. The front mold can push the first push rod to move backward. The first push rod can drive the slider to move backward and compress the elastic member. The slider can drive the second push rod to move backward until it retracts into the rear mold core. When the front mold is separated from the rear mold, the elastic member drives the second push rod to move forward to push the spoon body away from the rear mold core.

[0008] According to some embodiments of the present utility model, a rear air flow channel is provided inside the rear mold, and the rear air flow channel extends to a portion of the rear mold core aligned with the cover body.

[0009] According to some embodiments of the present utility model, the pushing ring assembly includes a driving member and a front ring. The front ring is movably disposed back and forth on the front mold. The driving member is used to drive the front ring to move back and forth. The front ring is aligned with a portion of the front mold core that forms the cover body to push the cover body away from the front mold core.

[0010] According to some embodiments of the present utility model, a plurality of driving members are symmetrically arranged so that the front ring remains stable during movement.

[0011] According to some embodiments of the present utility model, the driving member is a cylinder.

[0012] According to some embodiments of the present utility model, a guiding member is provided on the front mold, and the guiding member is used to guide the rear mold.

[0013] According to some embodiments of the present utility model, a feed pipe connected to an injection molding machine is provided inside the front mold, and the feed pipe communicates with the cavity.

[0014] According to some embodiments of the present utility model, cooling channels are provided in both the front mold and the rear mold.

[0015] According to an injection molding mold for an integrated cover and spoon according to an embodiment of the present utility model, it has at least the following beneficial effects:

[0016] (1) Compared with manual taking for demolding, it has the advantages of high demolding efficiency and can also reduce the risk of operator injury;

[0017] (2) Using the front ring to push the cover body, the contact area is large, and it is not easy to deform the cover body, effectively improving the qualified rate of workpieces;

[0018] (3) Setting cooling channels improves the cooling speed of workpieces after injection molding and improves production efficiency.

[0019] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Brief Description of the Drawings

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments, where:

[0021] Figure 1 is a schematic diagram of an installation structure of an embodiment of the present utility model;

[0022] Figure 2 is Figure 1 an enlarged view of part A in

[0023] Figure 3 is a schematic diagram of the whole of an embodiment of the present utility model;

[0024] Figure 4 is Figure 3 an enlarged view of part B in

[0025] Figure 5 is an exploded schematic diagram of the rear mold of an embodiment of the present utility model;

[0026] Figure 6 is Figure 5 an enlarged view of part C in

[0027] Figure 7 is a schematic diagram of the front mold of an embodiment of the present utility model;

[0028] Figure 8 is a schematic diagram of a workpiece of an embodiment of the present utility model;

[0029] Figure 9 is a sectional schematic diagram of a push ring assembly of an embodiment of the present utility model;

[0030] Figure 10 is Figure 9 an enlarged view of part D in

[0031] Figure 11 is a sectional schematic diagram of a feed pipe of an embodiment of the present utility model.

[0032] Reference Numerals in the Drawings:

[0033] Front mold 100, front mold core 110, protruding part 111;

[0034] Rear mold 200, rear cover plate 201, rear mold core 210, concave part 211, rear chute 220, rear air flow channel 230;

[0035] Workpiece 300, cover body 310, spoon body 320;

[0036] Rear demolding assembly 400, slider 410, first plate 411, second plate 412, elastic member 420, first push rod 430, second push rod 440;

[0037] Front air flow channel 500;

[0038] Push ring assembly 600, driving member 610, front ring 620;

[0039] Guide member 700;

[0040] Feed pipe 800;

[0041] Cooling flow channel 900. Detailed implementation mode

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0044] In the description of the present invention, "a plurality of" refers to more than two. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0045] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0046] Refer to Figures 1 to 11As shown in the figure, an injection mold for an integrated cover and spoon of the present utility model includes: a front mold 100, a rear mold 200, a rear demolding assembly 400, a front air flow channel 500, and a push ring assembly 600. A front mold core 110 is provided at the rear end of the front mold 100; the front mold core 110 is detachably connected to the front mold 100 for easy replacement. It can be foreseen that the front mold core 110 can be integrally formed with the front mold 100 to improve durability and precision. A rear mold core 210 is provided at the front end of the rear mold 200, and the rear mold core 210 is detachably connected to the rear mold 200 for easy replacement. It can be foreseen that the rear mold core 210 can be integrally formed with the rear mold 200 to improve durability and precision. The rear mold core 210 and the front mold core 110 cooperate to form a cavity for injection molding a workpiece 300. Plastic is injected into the cavity after melting to form the workpiece. The front mold 100 and the rear mold 200 are vertically arranged and parallel to each other, and the rear mold 200 can move back and forth relative to the front mold 100. It can be foreseen that the front mold 100 and the rear mold 200 are installed on an injection molding machine for use. The injection molding machine has the function of moving the front mold 100 and the rear mold 200 closer and farther away from each other. Since the injection molding machine is a prior art, it will not be described in detail here. The workpiece 300 includes an integrally injection-molded cover 310 and a spoon 320; the front mold core 110 has a protrusion 111, and the rear mold core 210 has a recess 211. The protrusion 111 and the recess 211 make the cover have a certain curvature. During the demolding process, the workpiece 300 shrinks due to the effect of thermal expansion and contraction and is more likely to remain on the front mold core 110. The rear demolding assembly 400 is provided on the rear mold 200. After the plastic is molded in the cavity, the front mold 100 and the rear mold 200 are separated under the drive of a hydraulic device or manually, so that the rear mold core 210 is separated from the front mold core 110. At the same time that the rear mold core 210 is separated from the front mold core 110, the demolding assembly pushes the workpiece 300 away from the rear mold core 210, so that after the rear mold core 210 is separated from the front mold core 110, the workpiece 300 remains on the front mold core 110; the front air flow channel 500 is opened in the front mold 100, and the front air flow channel 500 is connected to a compressed air pipeline. The compressed air pipeline provides compressed air with a pressure of 0.8 MPa to 2 MPa to the front air flow channel 500. The front air flow channel 500 extends to the part of the front mold core 110 that forms the spoon 320; since the connection force between the spoon 320 and the front mold core 110 is not large, the compressed air in the front air flow channel 500 can be used to push the spoon 320 away from the front mold core 110. The push ring assembly 600 is provided on the front mold 100, and the push ring assembly 600 can move back and forth to push the cover 310 away from the front mold 100. Since the cover 310 shrinks and sleeves on the protrusion 111 of the front mold core 110, a relatively large force is required for demolding, and the thrust generated by the compressed air is limited and not enough to push the cover 310, so the push ring assembly 600 needs to be used for demolding.The demolding assembly of the rear mold 200, the front air flow channel 500, and the push ring assembly 600 cooperate to assist the workpiece 300 to be separated from the front mold 100 and the rear mold 200. Compared with manual demolding, it has the advantage of high demolding efficiency and can also reduce the risk of injury to operators.

[0047] Reference Figures 1 to 6 As shown, it can be understood that the rear end of the rear mold core 210 is provided with a rear chute 220 extending forward and backward, and the rear end of the rear mold 200 is also bolted with a rear cover plate 201 for closing the rear chute 220. The rear demoulding assembly 400 includes a slider 410, which can be installed in the rear chute 220 to move forward and backward. The rear cover plate 201 can be disassembled and replaced to remove the slider 410. After the rear cover plate 201 is installed, the rear cover plate 201 can prevent the slider 410 from escaping from the rear chute 220. The slider 410 is used to push the spoon body 320 away from the rear mold core 210 when the front mold 100 is separated from the rear mold 200. The slider 410 is composed of a parallel first plate 411 and a second plate 412, and the first plate 411 and the second plate 412 are connected by bolts. The slider 410 is manufactured separately to reduce production costs. Pushing the spoon body 320 away from the rear mold core 210 by the slider 410 has the advantage of high demoulding efficiency compared to manual demoulding, and can also reduce the risk of operator injury.

[0048] Reference Figures 1 to 6As shown, it can be understood that the post-demolding assembly 400 includes an elastic member 420 provided at the rear end of the slider 410. The elastic member 420 is a bolt with a spring. Four elastic members 420 are symmetrically arranged. The elastic members 420 are bolted to the second plate 412. Bolt connection has the advantages of simple installation and convenient replacement. The front end of the slider 410 is bolted with a first push rod 430 and a second push rod 440. The first push rod 430 and the second push rod 440 are bolted to the first plate 411. There are four first push rods 430 arranged symmetrically and two second push rods 440. The first push rod 430 can also be installed on the second plate 412. During installation, first pre-assemble the first push rod 430 and the second push rod 440 to the first plate 411, then pre-bolt the elastic member 420 to the second plate 412, and then bolt-connect the first plate 411 and the second plate 412. It can be foreseen that the bolt holes on the first plate 411 and the second plate are both set in a stepped shape so that the bolts will not protrude from the surface of the first plate 411 or the second plate 412. Both the first push rod 430 and the second push rod 440 extend out of the post-mold core 210. When the front mold 100 approaches the rear mold 200, it can push the first push rod 430 to move backward. When the front mold core 110 abuts against the post-mold core 210, the front ends of the first push rod 430 and the second push rod 440 are just flush with the surface of the post-mold core 210. So that the inner wall of the cavity is smooth and will not affect the shape of the workpiece 300. The first push rod 430 can drive the slider 410 to move backward and compress the elastic member 420. One end of the elastic member 420 away from the slider 410 abuts against the rear cover plate 201. The slider 410 can drive the second push rod 440 to move backward and retract into the post-mold core 210. When the front mold 100 is separated from the rear mold 200, the front mold 100 no longer pushes the first push rod 430. The elastic member 420 drives the slider 410 to drive the second push rod 440 to move forward to push the spoon body 320 away from the post-mold core 210. It can be foreseen that the second push rod 440 is aligned with the cavity part forming the spoon body 320 in the front-rear direction to facilitate pushing the spoon body 320.

[0049] Referring to Figures 1 to 6 As shown, it can be understood that a rear air flow channel 230 is provided inside the rear mold 200. The rear air flow channel 230 extends to the part where the post-mold core 210 is aligned with the cover body 310. The rear air flow channel 230 is connected to a compressed air pipeline. The compressed air pipeline supplies compressed air with a pressure of 0.8 MPa to 2 MPa to the rear air flow channel 230. Due to the thermal expansion and contraction of the cover body 310, there is a tendency to separate from the recess 211 on the post-mold core 210 after cooling. The compressed air in the rear air flow channel 230 is used to assist the separation of the cover body 310 from the post-mold core 210.

[0050] It can be foreseen that multiple cavities can be provided to improve production efficiency. However, the more cavities there are, the larger the sizes of the front mold 100 and the rear mold 200, and the higher the manufacturing cost of the equipment. Therefore, in this embodiment, two cavities are provided to simultaneously injection-mold two workpieces 300.

[0051] Referring to Figure 9 and Figure 10 As shown, it can be understood that the push ring assembly 600 includes a driving member 610 and a front ring 620, and the front ring 620 is made of metal. The driving member 610 is a cylinder or a hydraulic cylinder disposed in the front mold 100. The front ring 620 is movably disposed in the front mold 100 in the front and rear directions. A part of the front ring 620 is used to cooperate with the front mold core 110 and the rear mold core 210 to form a cavity. The driving member 610 is used to drive the front ring 620 to move back and forth. A groove is provided on the front mold core 110 for the front ring 620 to be embedded. When the front ring 620 moves backward, it abuts against the edge of the cover body 310, and the entire edge portion of the cover body 310 abuts against the front ring 620. By pushing the edge of the cover body 310, the cover body 310 is separated from the front mold core 110. The front ring 620 is aligned with the portion of the front mold core 110 that forms the cover body 310 to push the cover body 310 away from the front mold core 110. Since the combination of the cover body 310 and the protrusion 111 on the front mold core 110 is relatively tight, the thrust in the form of compressed air is not sufficient to push the cover body 310 away from the front mold core 110. If the cover body 310 is pushed by a push rod, the contact area between the push rod and the cover body 310 is small and the pressure is large, which easily causes the cover body 310 to deform and results in unqualified external dimensions of the final workpiece 300. By using the front ring 620 to push the cover body 310, the contact area is large and the cover body 310 is not easily deformed, effectively improving the qualification rate of the workpiece 300.

[0052] Referring to Figures 7 to 11 As shown, it can be understood that a plurality of driving members 610 are symmetrically arranged to keep the front ring 620 stable during movement. Four driving members 610 are symmetrically arranged to stably drive the front ring 620 to move back and forth. The outer side of the front ring 620 is square, and a central hole for the protrusion 111 to pass through is provided in the center of the front ring 620. The diameter of the central hole is smaller than the diameter of the cover body 310, so that when the front ring 620 moves backward, it can contact the entire edge of the cover body 310, reducing the pressure on the local part of the cover body 310 and preventing the cover body 310 from deforming, thereby uniformly driving the cover body 310 to move forward.

[0053] Referring to Figures 7 to 11As shown, it can be understood that the driving member 610 is a cylinder. Selecting a cylinder as the driving member 610 has a low cost, and the cylinder has the advantages of small volume and fast movement. The telescopic end of the driving member 610 is bolted to the front ring 620. Since the telescopic end of the cylinder needs to pass through the front mold 100, for the convenience of installation, the front ring 620 is bolted to the driving member 610. Since the outer side of the front ring 620 is square, the driving member 610 is preferably connected to the four corners of the square front ring 620. The four driving members 610 expand and contract synchronously, so as to uniformly drive the cover body 310 to move back and forth.

[0054] Referring to Figures 7 to 11 As shown, it can be understood that a guiding member 700 is provided on the front mold 100, and the guiding member 700 is a metal optical axis. The guiding member 700 extends in the front-back direction, and four guiding members 700 are symmetrically arranged. The guiding member 700 is used to guide the rear mold 200. A sleeve sleeved on the optical axis is provided on the rear mold 200, and the sleeve can move back and forth along the guiding member 700. The guiding member 700 and the sleeve cooperate to guide when the rear mold 200 moves back and forth, so that the rear mold 200 can be kept aligned with the front mold 100 in the front-back direction during the movement, and the rear mold 200 can also be kept parallel to the front mold 100 during the movement. The forming quality of the workpiece 300 is improved.

[0055] Referring to Figure 11 As shown, it can be understood that a feed pipe 800 connected to an injection molding machine is provided in the front mold 100, and the feed pipe 800 communicates with the cavity. The injection molding machine transports the molten plastic to the cavity through the feed pipe 800, and a heating component is provided around the feed pipe 800 to prevent the plastic from solidifying and blocking in the feed pipe 800.

[0056] Referring to Figure 11 As shown, it can be understood that cooling channels 900 are provided in both the front mold 100 and the rear mold 200. Since the workpiece 300 needs to be cooled and solidified before demolding after injection molding, a coolant is introduced into the cooling channels 900 to quickly cool down the front mold 100 and the rear mold 200, which can improve the cooling speed of the workpiece 300 after injection molding and improve the production efficiency.

[0057] Working steps: Connect the front mold 100 and the rear mold 200 to the injection molding machine respectively with bolts. The injection molding machine drives the front mold 100 and the rear mold 200 to approach each other. During the process of the front mold 100 approaching the rear mold 200, it can push the first push rod 430 to move backward. The first push rod 430 drives the slider 410 to move backward and compress the elastic member 420. When the front mold core 110 and the rear mold core 210 are in contact, the front ends of the first push rod 430 and the second push rod 440 are just flush with the surface of the rear mold core 210. The rear mold core 210 and the front mold core 110 cooperate to form a cavity. The injection molding machine transports the molten plastic into the cavity through the feed pipe 800, and coolant is introduced into the cooling flow channel 900 to quickly cool down the front mold 100 and the rear mold 200. The molten plastic solidifies in the cavity to form the workpiece 300. Due to the effect of thermal expansion and contraction, the workpiece 300 shrinks, and the cover body 310 will tightly sleeve on the protruding portion 111 of the front mold core 110. Then the injection molding machine drives the front mold 100 and the rear mold 200 to separate from each other, and the compressed air pipeline provides compressed air into the rear air flow channel 230. Due to the thermal expansion and contraction of the cover body 310, there is a tendency to separate from the concave portion 211 on the rear mold core 210 after cooling. The compressed air in the rear air flow channel 230 assists the cover body 310 to separate from the rear mold core 210. The elastic member 420 drives the slider 410 to drive the second push rod 440 to move forward to push the spoon body 320 away from the rear mold core 210. Then the compressed air pipeline provides compressed air into the front air flow channel 500, and the compressed air in the front air flow channel 500 can push the spoon body 320 to separate from the front mold core 110. The driving member 610 drives the front ring 620 to move backward, and the front ring 620 pushes the edge of the cover body 310 to separate the cover body 310 from the front mold core 110.

[0058] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art to which it pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. An injection mold for an integrated lid and spoon, characterized in that, Comprising: A front mold (100), a front mold core (110) is provided at the rear end of the front mold (100); A rear mold (200), a rear mold core (210) is provided at the front end of the rear mold (200), the rear mold core (210) cooperates with the front mold core (110) to form a cavity, and the cavity is used for injection molding a workpiece (300), and the workpiece (300) includes a cover body (310) and a spoon body (320); A rear demolding assembly (400), which is arranged on the rear mold (200), and the rear demolding assembly (400) is used to push the workpiece (300) away from the rear mold core (210); A front air flow channel (500), which is opened in the front mold (100), and the front air flow channel (500) extends to a part of the front mold core (110) to form the spoon body (320); A push ring assembly (600), which is arranged on the front mold (100), and the push ring assembly (600) can move back and forth to push the cover body (310) away from the front mold (100).

2. The integrated injection mold for the lid and spoon according to claim 1, characterized in that: The rear mold core (210) is provided with a rear chute (220), the rear demolding assembly (400) includes a slider (410), the slider (410) is movably installed in the rear chute (220) back and forth, and the slider (410) is used to push the spoon body (320) away from the rear mold core (210) when the front mold (100) is separated from the rear mold (200).

3. The integrated injection mold for the lid and spoon according to claim 2, characterized in that: The rear demolding assembly (400) includes an elastic member (420) arranged at the rear end of the slider (410), the front end of the slider (410) is connected with a first push rod (430) and a second push rod (440), both the first push rod (430) and the second push rod (440) extend out of the rear mold core (210), the front mold (100) can push the first push rod (430) to move backward, the first push rod (430) can drive the slider (410) to move backward and compress the elastic member (420), the slider (410) can drive the second push rod (440) to move backward and retract into the rear mold core (210), when the front mold (100) is separated from the rear mold (200), the elastic member (420) drives the second push rod (440) to move forward to push the spoon body (320) away from the rear mold core (210).

4. The integrated injection mold for the lid and spoon according to claim 1, characterized in that: A rear air flow channel (230) is arranged inside the rear mold (200), and the rear air flow channel (230) extends to a part of the rear mold core (210) aligned with the cover body (310).

5. The integrated injection mold for lid and spoon according to claim 1, wherein: The push ring assembly (600) includes a driving member (610) and a front ring (620), the front ring (620) is movably arranged on the front mold (100), the driving member (610) is used to drive the front ring (620) to move back and forth, and the front ring (620) is aligned with a part of the front mold core (110) to form the cover body (310) to push the cover body (310) away from the front mold core (110).

6. The integrated injection mold for the lid and spoon according to claim 5, characterized in that: A plurality of the driving members (610) are symmetrically arranged to keep the front ring (620) stable during movement.

7. The integrated injection mold for the lid and spoon according to claim 5, characterized in that: The driving member (610) is a cylinder.

8. The integrated injection mold for the lid and spoon according to claim 1, wherein: A guiding member (700) is provided on the front mold (100), and the guiding member (700) is used to guide the rear mold (200).

9. The integrated injection mold for the lid and spoon according to claim 1, characterized in that: A feeding pipe (800) connected to an injection molding machine is provided in the front mold (100), and the feeding pipe (800) communicates with the cavity.

10. The integrated injection mold for the lid and spoon according to claim 1, characterized in that: Cooling channels (900) are provided in both the front mold (100) and the rear mold (200).

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