A split injection mold frame convenient for processing

Abstract

This utility model proposes an easy-to-manufacture openable injection mold frame, including an upper panel, a fixed template, a moving template, and a lower panel arranged sequentially along the mold closing direction. A product molding cavity for installing the mold core is formed between the fixed template and the moving template, and guided engagement is achieved through a guide post assembly. At least one pair of opposite sides of the fixed template and the moving template respectively form a first side portion and a second side portion. On the side closest to the cavity, the opposite edges form a curved contour splicing surface extending along the length direction of the mold frame. When the mold is closed, the curved contour splicing surface is used to jointly bear the lateral clamping force between the fixed template and the moving template and to distribute the load, reduce local stress concentration on the side, and improve the lateral shear bearing capacity and lateral positioning stability. During shutdown or transportation, the fixed template and the moving template are mechanically locked by a lateral locking device, which helps to improve the safety and overall reliability of the mold frame.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and more specifically, to an easy-to-process openable injection mold frame. Background Technology

[0002] In traditional injection mold bases, the lateral positioning of the fixed and moving mold plates mainly relies on the cooperation of guide pillars and guide sleeves. However, this structure is essentially guide-oriented and cannot effectively withstand continuous or sudden large lateral forces, especially under high-pressure injection or mold platen eccentric loading, which can easily lead to wear or accuracy drift. To withstand the lateral components of the clamping force from the injection molding machine and the uneven pressure transmission within the cavity, straight stepped surfaces are usually provided on the sides of the fixed and moving mold plates to provide lateral support and positioning constraints in the mold-closed state.

[0003] However, the above-mentioned common side structures have defects: the effective contact area of ​​flat stepped surfaces or simple planar mating is limited, and lateral loads are often concentrated in local straight edges or corner areas. Long-term use can easily cause indentations, wear, or even biting at sharp corners, resulting in a decrease in the lateral positioning accuracy of the fixed template and the moving template; when the template undergoes slight elastic deformation under stress, the straight contact surface is difficult to fully re-fit in time, which can easily cause slight misalignment or opening on the side near the cavity, causing burrs and flash to appear near the parting line, affecting the product's appearance and dimensional stability.

[0004] Therefore, it is necessary to provide an easy-to-manufacture openable injection mold base that has a larger contact area, more uniform force distribution, is easy to process and assemble, and can be combined with a simple mechanical locking mechanism to achieve reliable lateral positioning and protection in both working and non-working states. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes an easy-to-process openable injection mold frame. Under the premise of ensuring the lateral locking rigidity of the fixed mold plate and the moving mold plate and the positioning accuracy of the cavity side, a curved contour splicing surface with a concave center and outward ends is set on the opposite side. The combined structure of the arc surface fitting section and the step shoulder is adopted, along with a simple lateral locking device, to achieve a larger contact area, more uniform force distribution, and easier overall processing and assembly.

[0006] A manufacturable, openable injection mold base includes an upper panel, a fixed mold plate, a movable mold plate, and a lower panel arranged sequentially along the mold closing direction. The space between the fixed and movable mold plates is used to install a mold core to form a product molding cavity. The fixed and movable mold plates are guided and fitted by a guide post assembly, which includes guide posts disposed on the movable mold plate and guide sleeves disposed on the fixed mold plate. The guide posts and guide sleeves are slidably fitted. At least one pair of opposite sides of the fixed and movable mold plates constitute a lateral opening and closing area. In this lateral opening and closing area, the fixed mold plate side forms a first side portion, and the movable mold plate side forms a second side portion. The first and second side portions form a curved profile splicing surface at their opposite edges near the cavity. The curved profile splicing surface extends along the length of the mold base, with its central portion concave towards the cavity and its two ends extending outwards from the mold base, resulting in a concave arc-shaped profile near the cavity and an outwardly flared profile at the two ends away from the cavity.

[0007] In some embodiments, the curved profile splicing surface is formed by an arc-shaped fitting section protruding towards the cavity side and stepped shoulders connected to both ends of the arc-shaped fitting section on a cross section perpendicular to the mold closing direction.

[0008] Specifically, the step shoulder has a height difference in the mold closing direction, so that the first side and the second side overlap in the height direction when the mold is closed. This results in both arc surface fit and step-like height overlap at the curved contour splicing surface, thereby increasing the lateral contact area along the curved contour splicing surface and improving the shear bearing capacity and lateral positioning stability between the fixed template and the moving template.

[0009] In some embodiments, the first side portion and the second side portion are joined together by a curved contour splicing surface to jointly bear the lateral clamping force between the fixed mold plate and the moving mold plate during mold closing. When the mold is subjected to lateral component forces caused by tie rods or internal cavity pressure on the injection molding machine, the curved contour splicing surface distributes this lateral load to the combined contact area of ​​the arc-shaped fitting section and the stepped shoulder, reducing local stress concentration.

[0010] In some embodiments, a lateral locking device is also included. The lateral locking device is disposed outside the first side portion and / or the second side portion, and includes a locking block and a third fastener for securing the locking block to the fixed template and / or the movable template. In the locked position, the locking block spans between the fixed template and the movable template, and the third fastener locks the fixed template and the movable template relative to each other to prevent relative displacement of the fixed template and the movable template during shutdown, handling, or maintenance.

[0011] In some embodiments, the lateral locking device uses at least two third fasteners to reliably fix the locking block in a preset position. The locking block and the third fasteners are in a loose or removed state during normal injection molding. When it is necessary to stop production, hoist, or repair the mold, the locking block is fixedly connected to the fixed template and / or the moving template in sequence through the third fasteners, thereby achieving temporary mechanical locking of the fixed template and the moving template.

[0012] In some embodiments, the fixed template and / or the moving template are provided with a plurality of blind mounting holes for accommodating heating rods. Each blind mounting hole is machined from the same end face of the template and its axis is parallel to the mold closing direction and distributed along the circumferential direction of the cavity. This is used to arrange heating elements in the circumferential area of ​​the cavity so as to achieve relatively uniform heating control of the mold core and the product forming area.

[0013] In some embodiments, a pre-assembled ejection assembly is provided between the moving template and the panel adjacent to it on the side facing away from the fixed template. The panel can be either an upper panel or a lower panel. The ejection assembly includes an ejection plate and a plurality of ejection holes disposed on the ejection plate. Ejection rods can pass through the ejection holes and reciprocate along the mold closing direction to eject the molded product from the mold core during the mold opening stage.

[0014] In some embodiments, the ejection assembly further includes a guide member connected to the ejection plate and a return member for driving the ejection plate to reset. The guide member is guided relative to the moving template to limit the reciprocating motion of the ejection plate in the mold closing direction, and the return member is used to pull the ejection plate back to its initial position after ejection is completed.

[0015] In some embodiments, at least one mold core is mounted on the fixed template and / or the movable template, and the mold core has a gas suction channel inside for extracting gas from the cavity. One end of the gas suction channel is connected to the area adjacent to the molding surface of the mold core through a plurality of first connecting holes, and the other end forms a suction inlet on the side of the corresponding template to guide residual gas in the cavity to the outside of the template.

[0016] In some embodiments, an air extraction assembly connected to an air extraction inlet is provided on the outer side of the mold plate. The air extraction assembly includes an air extraction cylinder and an air extraction chamber driven by the air extraction cylinder. The air extraction chamber is connected to a gas suction channel and is used to extract and discharge gas in the cavity at a predetermined stage during the injection molding cycle, so as to reduce the adhesion between the product and the mold core and improve the surface quality of the product.

[0017] In some embodiments, a heat insulation plate is provided on the outer periphery of the fixed mold plate and / or the moving mold plate. The heat insulation plate is arranged along the four edges of the fixed mold plate and / or the moving mold plate, and its outward-facing surface is used to contact the injection molding machine mold plate or mold frame support component. The heat insulation plate is detachably connected to the corresponding fixed mold plate or moving mold plate by a plurality of second fasteners. The heat insulation plate can reduce the conduction of heat from the inside of the fixed mold plate and the moving mold plate to the outside, which is beneficial to maintaining the stability of the temperature field inside the mold.

[0018] In some embodiments, at least one buffer reset post is provided on the surface of the moving mold plate facing away from the fixed mold plate on the outer side of the cavity area. The buffer reset post extends outward along the mold closing direction, and its end forms a contact fit with the mating area below the fixed mold plate. When the mold is close to the mold closing end point, it contacts the fixed mold plate before the mold core to absorb part of the mold closing impact force. During the mold opening process, the buffer reset post assists in pushing the moving mold plate and / or ejection assembly back to the initial position through the reset force of the internal or connected elastic element, thereby reducing the impact on the mold frame and improving the smoothness of mold opening and closing.

[0019] In some embodiments, the exposed surfaces of the upper panel, fixed template, moving template, and lower panel are provided with machined recessed markings for identification. The machined recessed markings include at least part numbers and assembly reference marks for distinguishing the positions of the upper panel, fixed template, moving template, lower panel, and their side parts, so as to facilitate the assembly, calibration, and maintenance management of the mold.

[0020] Compared with the prior art, the present invention has the following beneficial effects: Firstly, by setting curved contour splicing surfaces that are concave in the middle and flared outward at both ends on the opposite sides of the fixed and moving mold plates, the side fit is no longer a simple straight line or a single step contact, but rather forms a continuous arc-shaped fitting segment in the length direction and a step shoulder overlap in the height direction. Compared with the traditional flat side structure, this significantly increases the effective contact envelope area, allowing the lateral clamping force to be dispersed and transmitted between the arc surface and the step shoulder, reducing local stress concentration and wear, and maintaining high lateral positioning accuracy even after long-term use.

[0021] Secondly, the arc-shaped fitting section is arranged close to the cavity area, and the two ends are transitioned to the outer area through stepped shoulders, which provides stronger shear resistance and limiting ability near the cavity. This helps to suppress the small opening or misalignment of the fixed template and the moving template in the vicinity of the cavity under lateral load, reduce the risk of burrs and flashes on the product near the parting line, and improve the appearance and dimensional stability of the product.

[0022] Third, the curved contour splicing surface and the step shoulder are all integrally machined from the template body. The contour unfolds continuously in the length direction of the mold frame, which is suitable for one-time molding by CNC machining. This avoids the problems of complex assembly and difficult adjustment caused by multiple wedges, locking strips and other external parts, while taking into account the stress performance and processing technology, which meets the mold frame design requirements of "easy to process".

[0023] Fourth, in conjunction with the lateral locking device located on the outer side of the template, when the mold is stopped, hoisted, or under maintenance, the fixed template and the moving template can be reliably locked by the locking block and the third fastener to prevent accidental displacement of the template or damage to the mold core and guide pillar assembly due to vibration or collision. At the same time, this utility model can still conveniently arrange heating blind holes, mold core evacuation channels and outer evacuation components inside the template, and use them in conjunction with the ejection assembly, buffer reset pillar, heat insulation plate and other structures to ensure lateral rigidity while taking into account molding quality, mold opening and closing stability and convenience of later maintenance. Attached Figure Description

[0024] Fig. 1 This is a schematic diagram of the structure of an easy-to-process openable injection mold frame according to the present invention.

[0025] Fig. 2 This is a schematic diagram of the structure of an easy-to-process openable injection mold frame according to the present invention.

[0026] Explanation of main component symbols Top panel 10; heat insulation board 11; Fixed template 20; First side edge 21 Moving template 30; Second side edge 31 Bottom panel 40; Guide post assembly 50; Mold core 70; Cavity 71; Buffer reset post 72; 80 air extraction components; Curved outline splicing surface 90; Arc-shaped fitting section 91; Step shoulder 92; Lateral locking device 100; locking block 101; third fastener 102.

[0027] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0028] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.

[0029] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together (including integrated within a single system or component).

[0030] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections.

[0031] Example 1: In existing technologies, the sides of openable injection mold bases often use flat stepped surfaces or simple planar fits, along with guide pillars, guide sleeves, and external side locking blocks, wedges, and other components to withstand lateral clamping forces. While this type of structure is universal, the simple side contact shape means that the stress is mainly concentrated at local straight edges and corners. After long-term operation, problems such as indentation, wear, and decreased lateral positioning accuracy are prone to occur. At the same time, to improve load-bearing capacity, multiple locking components are often stacked, resulting in more parts, more complicated assembly and adjustment, and hindering standardized manufacturing.

[0032] To solve the above problems, the inventor realized that it was necessary to directly modify the side contours of the fixed template and the moving template. By designing a curved contour splicing surface extending along the length of the mold frame on the side near the cavity, and designing the middle part as an arc-shaped fitting section that is concave in the direction of the cavity, and the two ends transitioning into stepped shoulders, the side of the fixed template and the side of the moving template can form an arc-shaped fitting when the mold is closed, and also form a stepped overlap in the height direction.

[0033] On the one hand, it can expand the effective contact envelope in both length and height directions, disperse lateral loads, reduce local stress concentration, and improve lateral shear resistance and positioning stability; On the other hand, the curved profile and the step shoulder are integrally machined from the template body. Combined with simple locking blocks and fasteners on the outside, mechanical locking can be achieved in the non-working state. While taking into account the load-bearing performance, the structure is simple and the processing path is clear, which is convenient for mass production and maintenance.

[0034] like Figs. 1-2 As shown, an easy-to-manufacture openable injection mold frame includes an upper panel 10, a fixed template 20, a movable template 30, and a lower panel 40 arranged sequentially along the mold closing direction.

[0035] The space between the fixed template 20 and the movable template 30 is used to install the mold core 70 to form the product molding cavity 71. The fixed template 20 and the movable template 30 are guided and engaged by a guide post assembly 50. The guide post assembly 50 includes guide posts disposed on the movable template 30 and guide sleeves disposed on the fixed template 20. The guide posts and guide sleeves are slidably engaged. At least one pair of opposite sides of the fixed template 20 and the movable template 30 constitute a lateral opening and closing area. In this lateral opening and closing area, a first side portion 21 is formed on the side of the fixed template 20, and a second side portion 31 is formed on the side of the movable template 30.

[0036] The first side portion 21 and the second side portion 31 form a curved profile splicing surface 90 at their opposite edges on the side closest to the cavity 71. The curved profile splicing surface 90 extends along the length of the mold frame, with its middle part concave towards the cavity 71 and both ends extending towards the outside of the mold frame, so that the area near the cavity 71 has a concave arc-shaped profile, while the two ends away from the cavity 71 expand outward.

[0037] The curved profile splicing surface 90 is composed of an arc-shaped fitting section 91 protruding towards the cavity 71 and a stepped shoulder 92 connected to both ends of the arc-shaped fitting section 91 on a cross section perpendicular to the mold closing direction.

[0038] Specifically, the step shoulder 92 has a height difference in the mold closing direction, so that the first side 21 and the second side 31 overlap in the height direction when the mold is closed. This results in both arc-shaped fit and step-like height overlap at the curved contour splicing surface 90, thereby increasing the lateral contact area along the curved contour splicing surface 90 and improving the shear bearing capacity and lateral positioning stability between the fixed template 20 and the moving template 30.

[0039] The first side portion 21 and the second side portion 31 are fitted together by a curved contour splicing surface 90, so that they can jointly bear the lateral clamping force between the fixed mold plate 20 and the moving mold plate 30 along the curved contour splicing surface 90 when the mold is closed. When the mold is subjected to lateral component forces caused by the pressure from the tie rod or the inside of the cavity 71 on the injection molding machine, the curved contour splicing surface 90 distributes the lateral load to the combined contact area of ​​the arc-shaped fitting section 91 and the stepped shoulder 92, reducing local stress concentration.

[0040] It also includes a lateral locking device 100. The lateral locking device 100 is arranged on the outside of the first side portion 21 and / or the second side portion 31, and includes a locking block 101 and a third fastener 102 for fixing the locking block 101 to the fixed template 20 and / or the movable template 30. When in the locked position, the locking block 101 spans between the fixed template 20 and the movable template 30, and the fixed template 20 and the movable template 30 are locked relative to each other by the third fastener 102 to prevent relative displacement of the fixed template 20 and the movable template 30 during shutdown, handling or maintenance.

[0041] The lateral locking device 100 uses at least two third fasteners 102 to reliably fix the locking block 101 in a preset position. The locking block 101 and the third fasteners 102 are in a loose or removed state during normal injection molding. When it is necessary to stop production, hoist, or repair the mold, the locking block 101 is fixedly connected to the fixed template 20 and / or the moving template 30 in sequence through the third fasteners 102, thereby achieving temporary mechanical locking of the fixed template 20 and the moving template 30.

[0042] The fixed template 20 and / or the moving template 30 are provided with multiple blind holes for accommodating heating rods. Each blind hole is machined from the same end face of the template and its axis is parallel to the mold closing direction and distributed around the cavity 71. This is used to arrange heating elements in the circumferential area of ​​the cavity 71 so as to achieve relatively uniform heating control of the mold core 70 and the product forming area.

[0043] A pre-assembled ejection assembly is provided between the moving template 30 and the panel adjacent to it on the side opposite to the fixed template 20. The panel can be either the upper panel 10 or the lower panel 40.

[0044] The ejection assembly includes an ejection plate and multiple ejection holes disposed on the ejection plate. Ejection rods can pass through the ejection holes and reciprocate along the mold closing direction to eject the molded product from the mold core 70 during the mold opening stage.

[0045] The ejection assembly also includes a guide member connected to the ejection plate and a return member for driving the ejection plate to reset. The guide member is guided relative to the moving template 30 to limit the reciprocating motion of the ejection plate in the mold closing direction. The return member is used to pull the ejection plate back to the initial position after ejection is completed.

[0046] At least one mold core 70 is mounted on the fixed mold plate 20 and / or the movable mold plate 30. The mold core 70 has a gas suction channel inside for extracting gas from the cavity 71. One end of the gas suction channel is connected to the area adjacent to the molding surface of the mold core 70 through multiple first connecting holes, and the other end forms a suction inlet on the side of the corresponding mold plate to guide residual gas in the cavity 71 to the outside of the mold plate.

[0047] An air extraction component 80 connected to the air extraction inlet is provided on the outer side of the fixed template 20. The air extraction component 80 includes an air extraction cylinder and an air extraction chamber driven by the air extraction cylinder. The air extraction chamber is connected to the gas suction channel and is used to extract and discharge the gas in the cavity 71 at a predetermined stage during the injection molding cycle, so as to reduce the adhesion between the product and the mold core 70 and improve the surface quality of the product.

[0048] A heat insulation plate 11 is provided on the outer periphery of the fixed mold plate 20 and / or the movable mold plate 30. The heat insulation plate 11 is arranged along the four edges of the fixed mold plate 20 and / or the movable mold plate 30, and its outward-facing surface is used to contact the injection molding machine mold plate or mold frame support component. The heat insulation plate 11 is detachably connected to the corresponding fixed mold plate 20 or movable mold plate 30 by multiple second fasteners. The heat insulation plate 11 can reduce the conduction of heat from the inside of the fixed mold plate 20 and the movable mold plate 30 to the outside, which is beneficial to maintaining the stability of the temperature field inside the mold.

[0049] At least one buffer reset post 72 is provided on the surface of the moving template 30 facing away from the fixed template 20 on the outer side of the cavity 71 area. The buffer reset post 72 extends outward along the mold closing direction, and its end forms a contact fit with the mating area below the fixed template 20. When the mold approaches the mold closing end point, it contacts the fixed template 20 before the mold core 70 to absorb part of the mold closing impact force. During the mold opening process, the buffer reset post 72 assists in pushing the moving template 30 and / or the ejector assembly back to the initial position through the reset force of the internal or connected elastic element, thereby reducing the impact on the mold frame and improving the smoothness of mold opening and closing.

[0050] The exposed surfaces of the upper panel 10, fixed template 20, moving template 30 and lower panel 40 are all provided with machined recessed marks for identification. The machined recessed marks include at least the part number and assembly reference mark used to distinguish the upper panel 10, fixed template 20, moving template 30, lower panel 40 and their side positions, so as to facilitate the assembly, correction and maintenance management of the mold.

[0051] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A hinged injection mold base that is easy to process. It includes an upper panel, a fixed template, a moving template, and a lower panel arranged sequentially along the mold closing direction. The space between the fixed template and the moving template is used to install the mold core to form a product molding cavity. The fixed template and the moving template are guided and fitted by a guide post assembly. The guide post assembly includes guide posts disposed on the moving template and guide sleeves disposed on the fixed template. The guide posts and guide sleeves are slidably fitted together. At least one pair of opposite sides of the fixed template and the movable template constitute a lateral opening and closing region. In this lateral opening and closing region, the fixed template side forms a first side portion, and the movable template side forms a second side portion. The first side and the second side form a curved profile splicing surface at their opposite edges on the side closest to the cavity. The curved profile splicing surface extends along the length of the mold frame, with its middle part concave towards the cavity and both ends extending towards the outside of the mold frame, so that the area near the cavity has a concave arc profile, while the two ends away from the cavity expand outward.

2. The easy-to-manufacture openable injection mold base according to claim 1, characterized in that: The curved profile splicing surface is composed of an arc-shaped fitting section protruding towards the cavity side and stepped shoulders connected to both ends of the arc-shaped fitting section on a cross section perpendicular to the mold closing direction.

3. The easy-to-manufacture openable injection mold base according to claim 2, characterized in that: The first side and the second side fit together through a curved profile splicing surface so that they can jointly bear the lateral clamping force between the fixed template and the moving template along the curved profile splicing surface when the mold is closed.

4. The easy-to-manufacture openable injection mold base according to claim 1, characterized in that: It also includes a lateral locking device, which is arranged outside the first side portion and / or the second side portion, and includes a locking block and a third fastener for fixing the locking block to the fixed template and / or the moving template.

5. The opening and closing injection mold base according to claim 1, characterized in that: The lateral locking device uses at least two third fasteners to reliably fix the locking block in a preset position. The locking block and the third fasteners are in a loose or removed state when the mold is in normal injection molding operation. When it is necessary to stop production, hoist or repair the mold, the locking block is fixedly connected to the fixed template and / or the moving template in sequence through the third fasteners, thereby realizing the temporary mechanical locking of the fixed template and the moving template.

6. The easy-to-manufacture openable injection mold base according to claim 1, characterized in that: The fixed template and / or moving template are provided with multiple blind holes for accommodating heating rods. Each blind hole is machined from the same end face of the template and its axis is parallel to the mold closing direction and distributed along the circumference of the cavity. This is used to arrange heating elements in the circumferential area of ​​the cavity so as to achieve relatively uniform heating control of the mold core and the product forming area.

7. The easy-to-manufacture openable injection mold base according to claim 1, characterized in that: At least one mold core is assembled on the fixed template and / or the moving template. The mold core is provided with a gas suction channel for extracting gas from the cavity. One end of the gas suction channel is connected to the area adjacent to the forming surface of the mold core through multiple first connecting holes, and the other end forms a suction inlet on the side of the corresponding template to guide the residual gas in the cavity to the outside of the template.

8. The easy-to-manufacture openable injection mold base according to claim 7, characterized in that: An air extraction component connected to the air extraction inlet is provided on the outer side of the fixed template. The air extraction component includes an air extraction cylinder and an air extraction chamber driven by the air extraction cylinder. The air extraction chamber is connected to the gas suction channel and is used to extract and discharge the gas in the cavity at a predetermined stage during the injection molding cycle, so as to reduce the adhesion between the product and the mold core and improve the surface quality of the product.

9. The easy-to-manufacture openable injection mold base according to claim 1, characterized in that: A heat insulation plate is provided in the outer peripheral area of ​​the fixed template and / or the moving template. The heat insulation plate is arranged along the four edges of the fixed template and / or the moving template, and its outer surface is used to contact the injection molding machine template or mold frame support component. The heat insulation plate is detachably connected to the corresponding fixed template or moving template through multiple second fasteners. The heat insulation plate can reduce the heat conduction from the inside of the fixed template and the moving template to the outside, which is beneficial to maintaining the stability of the temperature field inside the mold.

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