Mold and manufacturing method and demolding method thereof

Abstract

The invention discloses a mold and a manufacturing method and a demolding method thereof, the mold comprises a plurality of first material structural parts and second material structural parts, the first material is metal, and the second material is metal. The second material structural parts are formed by pouring tin-containing metal capable of generating a tin epidemic phenomenon, and the plurality of first material structural parts are bonded together to form the mold. According to the mold disclosed by the invention, when the second material structural part is changed into powder due to the tin epidemic phenomenon, the first material structural part loses constraint and can freely move, so that the first material structural part is taken out from the inner cavity of the hollow component, and the hollow component with the special-shaped inner cavity is demolded. According to the special-shaped hollow component inner mold using isomer transformation, the manufacturing method of the mold and the demolding method of the mold, the problems that a special-shaped hollow component mold is insufficient in strength and rigidity, low in precision, low in demolding efficiency and incapable of being repeatedly used are solved, and the comprehensive performance of the special-shaped hollow component inner mold is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and more specifically, to a mold and a manufacturing method and a demoulding method thereof. Background Art

[0002] Special-shaped hollow components are parts with very complex manufacturing processes. Since the inner surface of special-shaped hollow components is difficult to manufacture, internal molds are generally used and formed through various methods such as carbon fiber paving, glass fiber paving, injection molding or casting molding, and demolding is performed after molding.

[0003] If the special-shaped hollow component is designed with a demoulding angle, the inner mold can be demoulded and pulled out as a whole. However, it is impossible to design a suitable demoulding angle for general special-shaped hollow components. In this case, the inner mold needs to be removed by various methods. There are five common types of inner molds that can be removed:

[0004] 1. Sol type, the inner mold can be dissolved by chemical reagents, the mold cannot be reused, and the reagents will cause certain corrosion to the components.

[0005] 2. Burning type, the inner mold can be fused by burning or heating. This type of mold has low precision and low strength and rigidity, and cannot produce components that require high-pressure forming, and burning or high temperature will have a certain impact on the components.

[0006] 3. Combination type: the inner mold is composed of several molds, which are taken out after being disassembled. This type of mold is expensive, has large gaps and low precision.

[0007] 4. Crushing type: the inner mold is crushed by physical means and then taken out. This type of mold has low strength and rigidity, low demoulding efficiency, and the mold cannot be reused.

[0008] 5. Air bag type, the inner mold is formed by inflating the air bag. This method requires a set of outer molds as fixed surfaces. This type of mold can withstand low pressure, cannot produce components that require high pressure forming, and cannot control the local thickness of the components.

[0009] The above common subtractable inner molds all have inevitable disadvantages and have certain limitations in use. Summary of the invention

[0010] The purpose of the present invention is to provide a mold and a manufacturing method and a demoulding method thereof, aiming to solve the problems of insufficient strength and rigidity, low precision, low demoulding efficiency and non-reusability of the mold inside the special-shaped hollow component.

[0011] According to one aspect of the present invention, a mold is provided, comprising a plurality of first material structural members and second material structural members, wherein the first material is metal, and the second material structural members are made of tin-containing metal that can cause tin pest phenomenon by injection molding and bonding the plurality of first material structural members together to form the mold.

[0012] Optionally, the thermal conductivity of the first material is greater than the thermal conductivity of the second material.

[0013] Optionally, the second material is an alloy of tin or any one of manganese, zinc, aluminum, magnesium, indium and tin in a mass ratio of 1: (99-100).

[0014] Optionally, the mold is an inner mold, which includes an external contour that is the same as the inner shape of the hollow component. The shapes of the first material structural parts and the second material structural parts are designed so that after the tin-containing metal releases the fixed constraints on the first material structural parts through the tin epidemic phenomenon, the first material structural parts can be taken out from the inner cavity of the hollow component.

[0015] Optionally, the first material structures are provided with positioning rods for determining the positions of the first material structures in the mold.

[0016] Optionally, at least one of the plurality of first material structural members is provided with a pouring port for pouring the molten second material, a liquid outlet, and a liquid flow channel connecting the pouring port and the liquid outlet.

[0017] Optionally, the first material structure comprises a core mold and a plurality of petal molds arranged around the core mold, and the core mold is provided with a pouring port for pouring the molten second material, a liquid outlet, and a liquid flow channel connecting the pouring port and the liquid outlet.

[0018] According to another aspect of the present invention, there is provided a method for manufacturing the above-mentioned mold, comprising:

[0019] Assembling a plurality of first material structural parts with a fixing tool, wherein the fixing tool is used to determine the position of each first material structural part in the mold;

[0020] The forming tool is sleeved on the outer side of the assembled first material structural member, and the forming tool is assembled with the fixing tool to obtain a combined tool, wherein the forming tool provides a restraining surface for the molten second material;

[0021] Infusing and filling the internal space of the combined tooling with a molten second material;

[0022] After cooling, the fixing tool and the forming tool are removed to obtain the mold.

[0023] Optionally, at least one of the plurality of first material structural members is provided with a pouring port, a liquid outlet and a liquid flow channel connecting the pouring port and the liquid outlet for pouring the molten second material, and the molten second material is poured into the combined tooling through the pouring port.

[0024] According to another aspect of the present invention, a demoulding method of the above-mentioned mold is provided, wherein a component product including the mold is placed in an environment of -13°C to -30°C;

[0025] After the tin-containing metal shows tin disease, vibrate the mold;

[0026] The fallen tin-containing metal is collected and each first material structural component is taken out to complete demoulding.

[0027] The beneficial effects of the present invention are as follows:

[0028] The mold of the present invention utilizes the tin pest phenomenon that tin undergoes allotropic transformation under low temperature environment, transforming block white tin into powdered gray tin, and makes the tin-containing metal that can undergo the tin pest phenomenon into a second material structure, and the second material structure is bonded with a plurality of first material structures, so that the first material structure and the second material structure together form a mold. When the second material structure undergoes the tin pest phenomenon and transforms into powder, the first material structure loses its restraint and can move freely, so that the first material structure is taken out from the inner cavity of the hollow component, thereby realizing the molding of the hollow component with a special-shaped inner cavity and convenient and quick demolding.

[0029] The mold of the present invention is made of all-metal material, and its mold rigidity and strength are much higher than those of airbag or crushing molds. It does not need to use fiber-reinforced materials, and solves the problem of insufficient strength and rigidity of existing inner molds with a simplified process; the all-metal mold of the present invention is cast as a whole using tin liquid, without any gaps and steps commonly seen in mold preparation, thereby improving the mold accuracy and component accuracy; using the mold of the present invention, after the component forming step, it is only necessary to lower the ambient temperature, and the tin-containing metal will be powdered by the tin-plague effect, and the mold can be taken out with a slight vibration, which greatly improves the demolding efficiency; the powdered tin-containing metal can be heated to become tin liquid, and then poured, filled and bonded to other metal mold structural parts to form a new inner mold, and all mold materials can be reused, reducing material cost and process cost.

[0030] The method for preparing the inner mold, the inner mold structure and the inner mold demoulding method provided by the present invention greatly improve the comprehensive performance of the inner mold of the special-shaped hollow component BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0032] Figure 1A schematic structural diagram of a mold according to Embodiment 1 of the present invention is shown.

[0033] Figure 2 A schematic structural diagram of a first material structural component of a mold in Example 1 of the present invention is shown.

[0034] Figure 3 A schematic structural diagram of a fixing tool according to Embodiment 1 of the present invention is shown.

[0035] Figure 4 A schematic structural diagram of a molding tool according to Embodiment 1 of the present invention is shown.

[0036] Figure 5 A schematic diagram showing a mold manufacturing method according to Example 1 of the present invention.

[0037] Figure 6 A schematic structural diagram of a hollow component with a mold according to Example 1 of the present invention is shown.

[0038] Figure 7 A schematic diagram showing the demoulding method according to Example 1 of the present invention is shown.

[0039] Figure 8 A schematic diagram of the mold structure of Example 2 of the present invention is shown.

[0040] Fig. 9 A schematic structural diagram of a hollow component with a mold according to Example 2 of the present invention is shown.

[0041] Fig.10 A schematic structural diagram of a fixing tool according to Embodiment 2 of the present invention is shown.

[0042] Fig.11 A schematic structural diagram of a forming tooling according to Embodiment 2 of the present invention is shown.

[0043] Fig.12 A schematic diagram showing a mold manufacturing method according to embodiment 2 of the present invention.

[0044] Fig.13 A schematic diagram showing the demoulding method according to Example 2 of the present invention is shown. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0047] It should be noted that, although the terms "first", "second", etc. may be used herein to describe various parts, components, elements, regions, layers and / or parts, these parts, components, elements, regions, layers and / or parts should not be limited by these terms. Instead, these terms are used to distinguish one part, component, element, region, layer and / or part from another. Thus, for example, the first part, first member, first element, first region, first layer and / or first part discussed below may be referred to as the second part, second member, second element, second region, second layer and / or second part without departing from the teachings of the present invention.

[0048] It should also be noted that, in the description of the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0049] In the related art, vacuum hot pressing is one of the most common molding processes in composite materials. In order to realize the design and molding of composite materials from particles or two-dimensional sheet materials to three-dimensional structures, embedded molds are a common method. However, for composite materials with special internal cavities, if the structure is made into two halves spliced ​​and assembled, the internal fibers are disconnected, reducing the strength of the composite structure. For one-piece composite materials, it is necessary to fill the internal space with an internal mold to shape it. Common internal molds that can be eliminated have inevitable shortcomings and have certain restrictions in use.

[0050] Example 1

[0051] like Figure 1-7 As shown, the embodiment 1 of the present disclosure provides a mold 100, including a plurality of first material structural members 121, 122, 123, 124, 125 (hereinafter also referred to as first structural members, 120) and a second material structural member (hereinafter also referred to as second structural member) 140, wherein the first material is metal, and the second material structural member 140 is formed by bonding a plurality of first material structural members 120 together through injection molding by a tin-containing metal capable of causing tin pest phenomenon to form the mold 100. The mold 100 of this embodiment is an inner mold, including an outer contour 160 having the same shape as the inner cavity of a hollow component to be formed, and the shapes of each first material structural member and the second material structural member are designed so that after the tin-containing metal releases the fixed constraints on each first material structural member through the tin pest phenomenon, each first material structural member can be taken out from the inner cavity of the hollow component respectively.

[0052] Figure 2 The schematic diagram of the structure of each first material structure of the mold 100 of embodiment 1 is shown. The mold 100 of this embodiment includes a plurality of first material structure members 121, 122, 123, 124, 125, each first structure member is Figure 3 After the positioning fixture 150 shown is positioned, a gap 110 is defined between each first structural member, and the gap 110 can also be called a gap 110. The gap 110 is used to fill the molten tin-containing metal to obtain the second material structural member 140, so that a plurality of first material structural members 120 and second material structural members 140 form an integral mold. The first structural member 120 serves as the skeleton of the mold, and its volume is much larger than the volume of the second material structural member 140. The second material structural member 140 serves as a bonding material to bond the skeleton together during the injection molding process, and provides space for demolding each first structural member after low-temperature pulverization. The shape of the gap 100, that is, the shape of the tin-containing metal structural member, is designed so that after the tin-containing metal is pulverized due to the tin pest effect, the space in the gap can enable each first structural member to be taken out from the inner cavity of the hollow component after molding.

[0053] In the present disclosure, tin-containing metal is used in combination with skeleton metal. Tin-containing metal is used as part of the material of the mold of the present disclosure, and most of the remaining materials are provided by the first material structure 120, so that the volume of the second material structure 140 is much smaller than the volume of the first material structure 120, which greatly reduces the amount of tin used, shortens the time for the occurrence of tin disease, and enables each first material structure 120 to be quickly separated. Through the shape design of the first material structure 120 and the shape design of the gap 100, it is easy to demould from a hollow component product with a complex inner cavity contour.

[0054] Since the first structural member 120 and the second structural member 140 of the mold 100 are both made of metal materials, they have high strength and rigidity and can be used to manufacture component products with high molding pressure. For example, when manufacturing thick high-strength carbon fiber products, the molding process needs to be pressed at 5 to 8 atmospheres of pressure. The mold disclosed in the present invention can fully withstand the molding pressure, the mold will not be deformed, and the molded product can maintain precise dimensions.

[0055] The shape of the plurality of first structural members 120 after being assembled by the positioning fixture 150 corresponds to the shape of the inner cavity of the hollow component product. In order to facilitate the removal of the first structural member 120 from the inner cavity of the product, the shapes of the various first material structural members 120 can be partially the same or completely different. The second material structural member 140 is formed by pouring molten tin-containing metal into the gap 110. When the molten tin-containing metal is cooled and solidified, the tin-containing metal in the gap 110 is formed into the second material structural member 140. Thus, the second material structural member 140 fills the gaps between the plurality of first material structural members 120, and the plurality of first material structural members 120 are bonded to form an integral mold. The first structural member 120 and the second structural member 140 together form a molding surface for contacting the inner cavity surface of the hollow component.

[0056] Under normal pressure, tin has two allotropes, gray tin (α tin) and white tin (β tin). At room temperature, it is a common silvery-white metallic white tin, which is ductile. The crystal of white tin is a tetragonal structure, metallic, and heavier than gray tin. When the temperature drops below 13.2°C, it will slowly turn into powdered gray tin. The crystal structure of gray tin is a diamond-shaped crystal structure similar to diamond, silicon, and germanium. Because gray tin forms a covalent structure between its atoms, electrons cannot transfer freely, so it does not have any metallic properties. Gray tin is a dark gray powder. When the temperature drops, the phenomenon that the block of white tin breaks into powdered gray tin is called "tin plague".

[0057] The second material structure 140 of the mold disclosed in the present invention is made of a tin-containing metal that can cause tin pestilence. The second material is, for example, an alloy of tin or any one of manganese, zinc, aluminum, magnesium, and indium with a mass ratio of 1: (99-100) to tin. Under conditions above room temperature, the material of the second material structure 140 is a block metal, and at this time, the mold is an integral structure. Since the gaps between the multiple first material structures 120 in the molding tool are filled with the molten liquid second material, the surface transition between the first material structures 120 can be smooth without any gaps and steps, so that the mold has high-precision outer dimensions, and then the inner cavity size of the product has high precision. When demolding is required, the component product and the mold are placed together in an environment below 13.2°C, and the second material structure 140 is converted into powdered gray tin, and the multiple first material structures 120 can be separated from each other and then detached from the inner cavity of the component product.

[0058] The disclosed embodiment uses the principle of transformation between allotropes of tin to make a metal material mold so that it can withstand a large molding pressure, and then transforms the white tin into gray tin by cooling, eliminates the second material structure 140, and separates each first material structure 120 from the product cavity to complete the demolding process. The second material structure 140 after demolding is in powder form, which can be reused after heating and melting.

[0059] Preferably, the thermal conductivity of the first material used to make the first material structure 120 is greater than the thermal conductivity of the second material structure 140. Preferably, the first material is copper or a copper alloy. Since the volume of the first material structure 120 is much larger than the volume of the second material 140, and the thermal conductivity of the first material is greater than the thermal conductivity of the second material, when the mold of the present disclosure is placed in a low-temperature environment, the heat of the second material structure 140 can be quickly transferred to the outside through the first material structure 120, thereby quickly reducing the temperature of the second material structure 140, increasing the transformation speed of white tin to gray tin, that is, increasing the transformation speed of the second material structure 140 from block to powder, achieving rapid demoulding, and solving the problem of slow demoulding in the prior art and the need for an initiator for demoulding. In addition, since tin has a lower melting point and copper has a higher melting point, pouring molten tin into the gaps 110 of multiple first material structural components 120 will not affect the appearance of the first material structural components 120, and tin and copper can also be well combined, making the first material structural component 120 and the second material structural component 140 more firmly bonded.

[0060] Preferably, the mold disclosed in the present invention is an inner mold, which has an outer contour that is the same as the shape of the inner cavity of the hollow component. The first material structure 120 and the second material structure 140 together form the outer contour 160 of the mold. When the second material structure 140 undergoes tin disease and becomes powdered, multiple first material structures 120 can be separated, that is, after the second material structure 140 is transformed into powdered gray tin, its fixed constraint on the first material structure 120 can be released, and the shapes of multiple first material structures 120 are designed to be taken out from the inner cavity of the hollow component. On the premise of ensuring that the first material structure 120 can be demolded smoothly, reducing the volume of the second material structure 140, that is, reducing the amount of tin used, can shorten the time when the tin disease phenomenon occurs and speed up the demolding speed. Reducing the amount of tin-containing metal used can reduce the time and energy consumed for melting the tin-containing metal in repeated mold molding, significantly reducing the process time and process cost of component molding.

[0061] Preferably, if Figure 2 As shown, each first material structure 121, 122, 123, 124, 125 is respectively provided with a positioning rod 131, 132, 133, 134, 135, which is used to locate the position of the first material structure. The positioning rod can determine the position of each first material structure in the mold by cooperating with the shape and position of the positioning hole 151 in the fixing tool 150, so that the mold formed by combining the first material structure 120 and the second material structure 140 has precise external dimensions, thereby making the inner cavity of the hollow component manufactured using the mold have precise dimensions.

[0062] like Figure 3 As shown in Figure 5, the embodiment of the present disclosure further provides a method for manufacturing a mold 100, comprising:

[0063] S1. Assemble each first material structural component 121 , 122 , 123 , 124 , 125 with a fixing fixture 150 . The fixing fixture 150 is used to determine the position of each first material structural component in the mold 100 .

[0064] The fixing tool 150 is provided with a plurality of positioning holes 151 corresponding to the positioning rods 131, 132, 133, 134, 135 on the first material structural parts 121, 122, 123, 124, 125. In this embodiment, the cross-sectional shapes of the positioning rods and the positioning holes are both square, and the positioning holes are blind holes. After the positioning rods are inserted into the positioning holes, the fixing tool 150 can position and fix each first material structural part 121, 122, 123, 124, 125 through the cooperation of the two, thereby ensuring the accurate position angle of each first material structural part.

[0065] S2, sleeve the molding tool 160 on the outside of the assembled first material structural component 120, and assemble the molding tool 160 and the fixing tool 150 to obtain a combined tool, wherein the molding tool 160 provides a restraining surface for the molten second material.

[0066] The molding tool 160 adopts a split-half structure, including two symmetrically arranged templates, which are sleeved on the outside of the first material structure 120, and then the two templates are fixedly connected by bolts. The inner surface of the molding tool 160 is preferably in contact with the outer surface of the assembled first material structure 120, so that the molding tool 160 covers the first material structure 120. The fixing tool 150 is provided with a first fixing boss 152, and the molding tool 160 is provided with a second fixing boss 162. The first fixing boss 152 is connected to the second fixing boss 162 by bolts, so that the fixing tool 150 is fixedly connected to the molding tool 160. The first fixing boss 152 and the second fixing boss 162 are respectively provided in two, wherein one second fixing boss 162 is provided on each of the two templates of the molding tool 160.

[0067] S3, pouring the molten second material into and filling the inner space of the combined tooling.

[0068] The fixing tool 150 and the forming tool 160 are assembled and connected to form a combined tool. The first structural member 120 is located in the combined tool. The inner surface of the forming tool 160 is in contact with the surface of the first structural member 120, enclosing an internal space for forming the second structural member 140. The tin-containing metal is heated to 231°C and becomes liquid, and is poured into the internal space to form the second structural member 140. In this embodiment, part of the end of the first structural member 120 is exposed to the outside of the forming tool 160 and the fixing tool 150. The molten tin-containing metal can be poured into the internal space through the gap at the end of the first material structural member 120. The molten metal fills the gap 110 between the first structural members 120 with its fluidity, forming the second structural member 140 bonded to the first structural member 120.

[0069] The forming tool 160 is made of a material with a low expansion coefficient. Preferably, the forming tool 160 is made of Invar steel, which is a nickel-iron alloy with a composition of 36% nickel, 63.8% iron, and 0.2% carbon. It has an extremely low thermal expansion coefficient and can maintain a fixed length within a wide temperature range. Invar steel, as the material of the forming tool, will not expand and deform when in contact with molten tin-containing metal, thereby ensuring that the obtained mold 100 meets the design requirements.

[0070] S4, after cooling, remove the fixing tool 150 and the forming tool 160 to obtain the mold 100.

[0071] After the tin-containing metal is cooled and shaped, the tin-containing metal bonds the first material structure 120 to form a whole. When removing the tooling, first separate the fixing tooling 150 from the forming tooling 160, then separate the two templates of the forming tooling 160 from each other, and finally obtain the mold 100.

[0072] like Figure 6 and Figure 7 As shown, the embodiment of the present disclosure also provides a demoulding method after forming a hollow component using the above-mentioned mold, comprising:

[0073] S1. placing the component product 300 including the mold 100 in an environment of -13°C to -30°C.

[0074] The hollow member 300 formed by using the mold 100 as an inner mold is placed in a low temperature environment where tin pest occurs, so that the tin-containing metal begins to experience tin pest. Preferably, the low temperature environment is minus 30° C. At this temperature, the transformation speed of the second material structure 140 from white tin to gray tin can reach a maximum value.

[0075] S2. After tin-containing metals show tin disease, vibrate the mold.

[0076] After the surface part of the second material structure 140 is transformed into powder, the mold and the hollow member 300 are placed on a vibration device to vibrate them, so that the powdered part of the second material structure 140 is vibrated and falls off from the gap of the first material structure 120. In addition, after the mold and the hollow member 300 are vibrated, the mold and the hollow member 300 can be placed in a low temperature environment again, so that the part of the second material structure 140 that has not yet experienced the tin disease phenomenon increases the speed of tin disease, and then the mold and the hollow member 300 are vibrated again. Steps S1 and S2 are repeated multiple times, so that the second material structure 140 is completely transformed into powder and falls off from the first material structure 120, so that the second material structure 140 loses the constraint on the first material structure 120, and a gap is formed in the hollow member, and the first material structure 120 can move freely to achieve demolding. It should be noted that the shape of each first material structural member 120 needs to be set to be able to be taken out from the inner cavity of the hollow component. The present disclosure does not specifically limit its shape, which provides greater flexibility in the shape design of the first structural member of the mold.

[0077] S3, collecting the fallen tin-containing metal and taking out each first material structural component 120, and completing demolding.

[0078] After the powdered second material is collected, it can be heated and melted, and then poured into the gaps 110 between the first material structural members 120 of the combined tooling to form the second material structural members 140, so that it can be reused, reducing the loss of tin-containing metal and lowering material costs.

[0079] Example 2

[0080] Figures 8 to 13 A mold 200 and a preparation method and a demolding method thereof according to Embodiment 2 of the present disclosure are shown.

[0081] The mold 200 provided in this embodiment is different from the mold 100 of embodiment 1 in that the first structural member 220 includes a core mold 221 and a plurality of flap molds 223 arranged around the core mold 221. The core mold 221 is cylindrical in shape, and a liquid flow channel is provided along the central axis and radial direction of the core mold 221. A pouring port 2211 is provided at the end of the core mold 221, and a plurality of liquid outlets 2212 are provided on the circumferential surface of the core mold 221. The pouring port 2211 is connected to the liquid outlet 2212 through the liquid flow channel. The plurality of flap molds 223 are evenly spaced along the outer circumferential surface of the core mold 222, and a gap 210 is defined between adjacent flap molds 223. The liquid outlet 2212 corresponds to the position of the gap 210. The molten second material can be poured into the gap 210 from the pouring port 2211 through the liquid flow channel and the liquid outlet 2212, so that the second material is filled between adjacent flap molds 23 to form a second structural member 240.

[0082] like Fig.10 , Fig.11 and Fig.12 As shown, the manufacturing method of the above-mentioned mold 200 provided in the embodiment of the present disclosure is different from the manufacturing method in Example 1 in that the fixed tool 250 is provided with a through hole 253, and the pouring port 2211 of the core mold 221 passes through the through hole 253 and is exposed to the outside of the fixed tool 250, so as to facilitate pouring the molten second material into the core mold 221. When the pouring port 2211 is inserted into the through hole 253, the through hole 253 also plays a positioning role for the core mold 221. A positioning rod 2231 is provided on each flap mold 223, and a positioning hole 251 corresponding to the positioning rod 2231 is provided on the fixed tool 251. The cross-sectional shape of the positioning rod 2231 and the positioning hole 251 is a triangle, and each triangle, for example, points to the center, which is used to position and fix the flap mold 223. The positioning hole 251 of this structure can accurately position the position and angle of the flap mold 233 at the same time.

[0083] Each first structural member 220 is assembled with a fixing tool 250 to obtain an assembled first structural member 220. Each first structural member is defined by the fixing tool to form a gap 210 for forming a second structural member. The core mold infusion port 2211 is exposed outside the fixing tool, and the core mold liquid outlet 2212 is exposed to the first structural member gap 210.

[0084] The molding tool 260 is sleeved on the outside of the assembled first structural member 220, and the molding tool 260 and the fixing tool 250 are assembled to obtain a combined tool, and the molding tool 260 provides a restraining surface for the molten second material. The molding tool 260 adopts a half-type structure, the fixing tool 250 is provided with a first fixing boss 252, and the molding tool 260 is provided with a second fixing boss 262. The first fixing boss 252 and the second fixing boss 262 can be connected by bolts, so that the fixing tool 250 and the molding tool 260 are fixedly connected.

[0085] The molten second material is poured through the core mold pouring port 2212 to fill the gap (internal space) 210 in the combined tooling to form a second structural member 240 bonded to the first structural member 220 .

[0086] like Fig. 9 and Fig.13 As shown, the demolding method provided by the embodiment of the present disclosure is different from the demolding method of Example 1 in that, after the second structural member 240 is completely converted into powder and the first material structural member 220 loses the constraint of the second material structural member 240, the core mold 221 is first taken out from the hollow component 400 with the mold 200, and then the petal molds 223 are taken out one by one, thereby completing the entire demolding.

[0087] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A mold, characterized in that: The mold comprises a plurality of first material structural members and a second material structural member, wherein the first material is metal, and the second material structural member is made of a tin-containing metal capable of causing tin pest phenomenon by injection molding and bonding the plurality of first material structural members together to form the mold.

2. The mold according to claim 1, characterized in that: The thermal conductivity of the first material is greater than the thermal conductivity of the second material.

3. The mold according to claim 1, characterized in that: The second material is an alloy of tin or any one of manganese, zinc, aluminum, magnesium, and indium with a mass ratio of 1: (99-100) to tin.

4. The mold according to claim 1, characterized in that: The mold is an inner mold, which includes an external contour that is the same as the inner shape of the hollow component. The shapes of the first material structural parts and the second material structural parts are designed so that after the tin-containing metal releases the fixed constraints on the first material structural parts through the tin epidemic phenomenon, the first material structural parts can be taken out from the inner cavity of the hollow component.

5. The mold according to claim 1, characterized in that: The first material structures are provided with positioning rods for determining the positions of the first material structures in the mold.

6. The mold according to claim 1, characterized in that: At least one of the plurality of first material structural members is provided with a pouring port for pouring the molten second material, a liquid outlet, and a liquid flow channel connecting the pouring port and the liquid outlet.

7. The mold according to claim 6, characterized in that: The first material structure comprises a core mold and a plurality of petal molds arranged around the core mold, wherein the core mold is provided with a pouring port for pouring the molten second material, a liquid outlet, and a liquid flow channel connecting the pouring port and the liquid outlet.

8. A method for manufacturing a mold, characterized in that: include: Assembling a plurality of first material structural parts with a fixing tool, wherein the fixing tool is used to determine the position of each first material structural part in the mold; Sleeve a molding tool on the outside of the assembled first material structure, and assemble the molding tool with the fixing tool to obtain a combined tool, wherein the molding tool provides a restraining surface for the molten second material; Infusing and filling the internal space of the combined tooling with a molten second material; After cooling, the fixing tool and the forming tool are removed to obtain the mold.

9. The manufacturing method according to claim 8, characterized in that: At least one of the plurality of first material structural members is provided with a pouring port, a liquid outlet and a liquid flow channel connecting the pouring port and the liquid outlet for pouring the molten second material, and the molten second material is poured into the combined tooling through the pouring port.

10. A demoulding method for a mold according to any one of claims 1 to 7, characterized in that: include: Placing the hollow component product including the mold in an environment of -13°C to -30°C; After the tin-containing metal shows tin disease, vibrate the mold; The fallen tin-containing metal is collected and each of the first material structural parts is taken out to complete demoulding.

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