Variable structure core and wax pattern mold

Abstract

The application relates to a variable-structure core and wax mold, and belongs to the technical field of precision casting. The application comprises a core mold and a wax mold; the core mold comprises a lower core mold and an upper core mold, and can form a core injection cavity and a positioning end movable block cavity; a lower positioning end movable block and an upper positioning end movable block can form a core positioning end cavity, and a plurality of groups of the lower positioning end movable block and the upper positioning end movable block can form a plurality of core positioning end cavities; the wax mold comprises a lower wax mold and an upper wax mold, and can form a wax injection cavity and a wax movable block cavity; a lower wax movable block and an upper wax movable block are embedded in the wax movable block cavity, and a plurality of groups of the lower wax movable block and the upper wax movable block can form a plurality of wax positioning end cavities. When the wall thickness is out of tolerance or the core is broken between the core and the shell, the application can flexibly adjust the positioning mode, so as to solve the problems of long debugging period, high cost and poor process adaptability caused by the solidification of the positioning end structure of the mold in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of precision casting technology, and in particular relates to a core and wax mold with a variable structure. Background Technology

[0002] Hollow aero-engine blades are crucial hot-end components of aero-engines and are typically manufactured using investment casting. During the casting process, a ceramic core is an indispensable transitional component, used to form the hollow structure inside the blade and determine the shape, size, and position of the internal cavity. A wax pattern is an intermediate forming part in the investment casting process; its shape matches the final hollow aero-engine blade, and it has pre-reserved space for the ceramic core. During casting, the wax pattern encapsulates the ceramic core. Subsequent processes, including coating with shell material, dewaxing, and firing, solidify the shell. The ceramic core remains inside the shell. Finally, a high-temperature molten alloy is poured in, and after the alloy cools and solidifies, the ceramic core is removed, yielding the aero-engine blade casting with the predetermined hollow structure.

[0003] The ceramic core requires high positional accuracy within the mold shell. Its positioning accuracy in the x, y, and z spatial directions directly determines the wall thickness uniformity and structural integrity of the hollow blade investment casting, thus affecting the blade's mechanical properties and service life. Specifically, the ceramic core needs to be tightly fixed relative to the mold shell to restrict its overall displacement. However, due to differences in thermal expansion stress between the ceramic core and the mold shell, excessively tight positioning significantly increases the core breakage rate. Therefore, the positioning end of the core needs to form a certain gap with the mold shell, allowing for appropriate degrees of freedom of movement in space to assist in adjusting the positioning posture, thereby achieving a balance between positioning accuracy and fracture resistance.

[0004] The industry commonly uses hot-press casting to prepare ceramic cores. In current technology, the positioning end structure of the ceramic core is directly solidified by the mold. When actual working conditions result in casting wall thickness deviations or an increased proportion of broken ceramic cores, the positioning gap of the ceramic core can only be adjusted indirectly by applying wax or paint during the wax pattern stage, thus indirectly regulating the core's degree of freedom of movement. However, this method is limited by the inherent structure of the ceramic core mold, resulting in a small adjustment range for the degree of freedom of movement and an inability to change the relative displacement of different parts of the core. When different positioning requirements need to be met, the entire set of ceramic cores and wax pattern molds must be replaced. This not only prolongs the process debugging cycle and significantly increases mold manufacturing and production costs, but also makes it difficult to achieve precise process optimization based on real-time production feedback, thus restricting the production efficiency and product qualification rate of investment casting for hollow aero-engine blades.

[0005] In summary, there is an urgent need to provide a more advantageous mold for preparing cores and wax patterns, which can flexibly adjust the positioning method when there are wall thickness deviations or core breakage between the core and the shell, in order to solve the problems of long debugging cycle, high cost and poor process adaptability caused by the solidification of the positioning end structure of the mold in the existing technology. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a variable-structure core and wax mold, which solves the above-mentioned technical problems by setting multiple sets of positioning end movable block structures. The specific invention content is as follows: This invention proposes a core and wax mold with a variable structure, wherein the wax mold covers the outer surface of the core, and includes a core mold and a wax mold; The core mold includes: The lower core mold and the upper core mold, when engaged, form the core injection cavity of the core and the positioning end block cavity located above the core injection cavity. The lower positioning end block and the upper positioning end block are engaged and fitted into the cavity of the positioning end block, and the cavity inside forms the core positioning end cavity of the core. The lower positioning end block and the upper positioning end block have several sets, and after they are locked together in a one-to-one correspondence, they can form several different structural forms of core positioning end cavities. The wax mold includes: The lower wax mold and the upper wax mold, when engaged, form the wax injection cavity of the wax mold and the wax block cavity located above the wax injection cavity. The lower wax mold block and the upper wax mold block are engaged and fitted into the cavity of the wax mold block, and the cavity inside forms a wax mold positioning end cavity to accommodate the core positioning end. The lower wax mold movable block and the upper wax mold movable block have several sets, and after they are snapped together one by one, the interior can form several wax mold positioning end cavities with different structural forms.

[0007] Furthermore, the lower positioning end block has a first positioning part; the upper positioning end block has a second positioning part; the first positioning part and the second positioning part can cooperate with each other to form a positioning structure; the upper core mold has a third positioning part, and the lower core mold has a fourth positioning part; the third positioning part and the fourth positioning part can cooperate with each other to form a positioning structure.

[0008] Furthermore, the lower wax mold and / or upper wax mold are provided with a fifth positioning part; The lower wax mold movable block and / or the upper wax mold movable block are provided with a sixth positioning part; The sixth positioning part and the fifth positioning part can cooperate with each other to form a positioning structure.

[0009] Furthermore, the lower wax mold movable block is provided with a seventh positioning part; the upper wax mold movable block is provided with an eighth positioning part; the seventh positioning part and the eighth positioning part can cooperate with each other to form a positioning structure.

[0010] Furthermore, the core positioning end cavity includes: The core has a first positioning cavity and a second positioning cavity; both the first positioning cavity and the second positioning cavity are connected to the core injection cavity. A core connecting cavity is disposed above the first positioning cavity and the second positioning cavity of the core, and connects the first positioning cavity and the second positioning cavity of the core. Additionally, a positioning cavity along the Z-axis of the core is provided through both sides of the core connecting cavity.

[0011] Furthermore, the wax model positioning cavity includes the wax model first positioning cavity, the wax model second positioning cavity, the wax model connecting cavity, and the wax model Z-axis positioning cavity; or, it only includes the wax model Z-axis positioning cavity; Both the first positioning cavity and the second positioning cavity of the wax model are connected to the injection cavity of the wax model.

[0012] Furthermore, the core positioning end cavity includes a first core positioning cavity and a second core positioning cavity; both the first core positioning cavity and the second core positioning cavity are connected to the core injection cavity.

[0013] Furthermore, the wax mold positioning cavity includes a first wax mold positioning cavity and a second wax mold positioning cavity; both the first wax mold positioning cavity and the second wax mold positioning cavity are connected to the wax mold injection cavity.

[0014] Furthermore, the core positioning end cavity includes a first core positioning cavity; the first core positioning cavity is connected to the core injection cavity.

[0015] Furthermore, the wax model positioning end cavity includes the wax model first positioning cavity; the wax model first positioning cavity is connected to the wax model injection cavity.

[0016] The beneficial effects of this invention are as follows: This invention configures several sets of cooperating lower and upper positioning end blocks, as well as lower and upper wax mold blocks, within a core mold and wax mold set. Multiple sets of lower and upper positioning end blocks allow for the creation of cores with different positioning end structures. Similarly, multiple sets of lower and upper wax mold blocks create cores with different positioning end structures that enclose the wax mold, forming a shell fixed to the positioning ends on the outer surface of the wax mold. This allows for the modification of the core's freedom of movement within the shell by changing cores with different positioning end structures during the process of pouring high-temperature alloy liquid between the shell and the core to form the finished casting. It enables adjustment of the core's movement along the Z-axis and rotational adjustment centered on the X or Z-axis, preventing core breakage or wall thickness deviations due to differences in thermal expansion coefficients between the core and shell or mold deformation. Furthermore, it solves the problem that when core breakage or wall thickness deviations occur, the entire mold set must be replaced, resulting in long debugging cycles, high costs, and difficulty in achieving precise process optimization based on real-time feedback. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings.

[0018] Figure 1 This is a schematic diagram of the first type of core structure according to an embodiment of the present invention; Figure 2 This is a partial structural diagram of the lower core mold according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the lower positioning end movable block structure according to an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of the lower positioning end movable block according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the upper positioning end movable block structure according to an embodiment of the present invention; Figure 6 This is a schematic cross-sectional view of the upper positioning end movable block according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the assembly structure of the lower positioning end block and the lower core mold according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the assembly structure of the lower positioning end block and the upper positioning end block according to an embodiment of the present invention; Figure 9 This is a partial structural diagram of the lower wax mold according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the first structure of the lower wax mold block according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the first structure of the wax mold movable block according to an embodiment of the present invention; Figure 12 This is a schematic diagram of the assembly structure of the lower wax mold, the lower wax mold block, and the upper wax mold block according to an embodiment of the present invention; Figure 13 A frontal view of a portion (positioning end) of the core according to an embodiment of the present invention is shown as a first structural schematic diagram. Figure 14 This is a rear view of a first structural diagram of a portion (positioning end) of the core according to an embodiment of the present invention; Figure 15 This is a schematic diagram of the second overall structure of the core according to an embodiment of the present invention; Figure 16 A schematic diagram of the second structure, taken from the front, of a portion of the core (positioning end) according to an embodiment of the present invention; Figure 17 This is a rear view of a second structural diagram of a portion (positioning end) of the core according to an embodiment of the present invention; Figure 18 This is a schematic diagram of the second structure of the lower wax mold block according to an embodiment of the present invention; Figure 19 This is a schematic diagram of the second structure of the wax mold block according to an embodiment of the present invention; Figure 20 This is a schematic diagram of the second structure of the wax model assembly, consisting of a wax model block, a wax model, and a core, after the wax model has been made according to an embodiment of the present invention. Figure 21 This is a schematic diagram of a third type of core structure according to an embodiment of the present invention; Figure 22 A schematic diagram of the third structure, taken from the front, of a portion of the core (positioning end) according to an embodiment of the present invention; Figure 23 This is a schematic diagram of the third structure of the lower wax mold block according to an embodiment of the present invention; Figure 24 This is a schematic diagram of the third structure of the wax mold block according to an embodiment of the present invention; Figure 25 This is a schematic diagram of a third structure of the wax model assembly, consisting of a lower wax model block, a wax model, and a core, after the wax model has been made according to an embodiment of the present invention.

[0019] Figure label: 1. Core; 101. Front cavity; 102. Rear cavity; 103. Venting edge; 104. Connection; 105. Positioning end; 1051. First positioning end positioning part; 1052. Second positioning end positioning part; 1053. Connection part; 1054. Z-axis positioning part; 2. Wax model; 3. Lower core mold; 4. Positioning end movable block cavity; 5. Lower positioning end movable block; 6. Upper positioning end movable block; 601. Core positioning end cavity; 6011. Core first positioning cavity; 6012. Core second positioning cavity; 6013. 6014, Core connecting cavity; 7, Core Z-axis positioning cavity; 8, Lower wax mold; 9, Lower wax mold movable block; 10, Upper wax mold movable block; 11, Wax mold positioning end cavity; 12, Wax mold first positioning cavity; 13, Wax mold second positioning cavity; 14, Wax mold connecting cavity; 15, Wax mold Z-axis positioning cavity; 16, Wax mold movable block cavity; 17, First positioning part; 18, Second positioning part; 19, Fifth positioning part; 10, Sixth positioning part; 11, Seventh positioning part; 12, Eighth positioning part. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts disclosed in this invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] It should be noted that when a component is referred to as "fixed to," "placed," "equipped with," "provided with," "arranged on," or "connected to" another component, it can be directly on the other component or may have an intervening component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or may have an intervening component present.

[0024] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of methods and systems consistent with some aspects of the invention as detailed in the appended claims.

[0025] Please refer to Figures 1-25 The contents are shown to better understand the specific structure of the present invention. The present invention provides a variable-structure core 1 and a wax mold injection mold, wherein a wax mold 2 covers the outer surface of the core 1, and includes a core mold and a wax mold.

[0026] Specifically, the hollow blades for aero-engines are manufactured using investment casting. In the manufacturing process, a ceramic core 1 is first prepared using a core mold via hot-pressing. Then, the ceramic core is placed inside a wax mold, which encloses the ceramic core. Next, a shell material is applied to the wax mold 2 enclosing the core 1. The shell is then solidified through melting, dewaxing, and firing processes, with the ceramic core 1 remaining inside the shell. Finally, a high-temperature alloy liquid is poured into the gap between the solidified shell and the core. After the alloy liquid cools and solidifies, the ceramic core is removed, yielding a hollow blade casting for an aero-engine with a pre-designed hollow structure.

[0027] Example 1, as Figure 1 As shown, the main structure of core 1 can be an existing form in the prior art, including but not limited to the front cavity 101 and the rear cavity 102. Its specific structure depends on the internal structure of the hollow blade of the aero-engine and is not limited here. The exhaust edge 103 (an existing structure of core 1 and not limited here) and the positioning end 105 of core 1 are additional structures to the main body of core 1 and do not participate in the forming of the blade's internal cavity. When the wax mold 2 is covered on the outer surface of core 1, the exhaust edge 103 and the positioning end 105 are wholly or partially exposed on the outside without being covered by the wax mold 2. The structure of the venting edge 103 and the positioning end 105 can be used to maintain a direct connection with the mold shell during the production of the mold shell (without the obstruction of the wax pattern 2). It can also be painted or waxed to form a certain gap, which can make fine adjustments to the position to a certain extent. This allows the mold shell and the core 1 to be positioned when the high-temperature alloy liquid is poured to form the finished casting, preventing uncertain displacement, rotation and other misalignment between the two, which could lead to core breakage (such as the breakage between the positioning end 105 and the main body of the core 1 or the breakage between the venting edge 103 and the main body of the core 1) or wall thickness deviation.

[0028] Specifically, the core mold includes a lower core mold 3 and an upper core mold (not shown in the figure), as well as a lower positioning end block 5 and an upper positioning end block 6.

[0029] Among them, such as Figure 2 As shown, the lower core mold 3 and the upper core mold (not shown in the figure) have symmetrical structures and can use the original core mold structure; however, cavities are opened at the upper positioning end 105 of the two respectively, so that after the lower core mold 3 and the upper core mold are interlocked, the upper positioning end movable block cavity 4 is formed inside, and the core body forms a core injection cavity (not shown in the figure) that matches the original core 1 structure.

[0030] In this embodiment, as Figures 3-6 As shown, the lower positioning end block 5 and the upper positioning end block 6 can be matched and fitted into the positioning end block cavity 4. After they are engaged with each other, the cavity 601 of the core positioning end of the core 1 is formed inside. Figure 7-8As shown. During assembly, the lower positioning end movable block should be installed into the lower core mold first, then the upper positioning end movable block should be installed into the upper core mold, and finally the lower core mold and the upper core mold should be fastened together (i.e., mold closing).

[0031] In this embodiment, the lower positioning end movable block 5 and the upper positioning end movable block 6 have several sets, and after they are fastened together one by one, several different core positioning end cavities 601 can be formed inside. That is, by setting multiple sets of lower positioning end movable blocks 5 and upper positioning end movable blocks 6, the positioning end 105 structure of the core 1 is also different, which can be used for positioning and adjustment under different conditions.

[0032] In this embodiment, the wax mold includes: a lower wax mold 7 and an upper wax mold (not shown in the figure), a lower wax mold block 8 and an upper wax mold block 9.

[0033] Among them, such as Figure 9 As shown, the lower wax mold 7 and the upper wax mold (not shown in the figure) can use the original structure of the wax mold. The only difference is that cavities are opened at the upper positioning end 105 of the two, so that when the two are interlocked, the upper wax mold movable block cavity 10 is formed inside, and the core body forms a wax injection cavity (not shown in the figure) that matches the original core 1 structure.

[0034] Specifically, the inner wall of the wax injection cavity should maintain a certain gap with the outer surface of the core 1 for wax injection. The size of this gap is determined by the blade wall thickness. After wax injection, a wax mold 2 is formed on the surface of the core 1.

[0035] In this embodiment, as Figures 10-12 As shown, the lower wax mold movable block 8 and the upper wax mold movable block 9 can be fitted into the wax mold movable block cavity 10. After they are interlocked, a wax mold positioning end cavity 901 (not shown in the figure) is formed inside to accommodate the positioning end 105 of the core 1. In specific assembly, the lower wax mold movable block should be installed into the lower wax mold first, then the upper wax mold movable block should be installed into the upper wax mold, and finally the lower wax mold and the upper wax mold should be snapped together (i.e., mold closing).

[0036] Specifically, the cavity 901 at the positioning end of the wax model can fit tightly with the surface of the positioning end 105 (with a certain small gap). During the wax injection process, it is ensured that the position where the structure of the positioning end 105 fits with the cavity 901 at the positioning end of the wax model does not cover the wax model 2 (due to the small gap, the wax model cannot enter). Therefore, after the wax model 2 is made, the positioning end 105 at the aforementioned position is exposed externally. This allows for a direct connection between the wax model and the mold shell during the mold shell production process (without the wax model 2 obstructing the connection). Alternatively, it can be painted or waxed to create a certain gap, allowing for some degree of fine-tuning of its position to establish a positioning relationship with the subsequent mold shell.

[0037] In this embodiment, the lower wax mold movable block 8 and the upper wax mold movable block 9 have several sets, and after they are snapped together one by one, several wax mold positioning end cavities 901 with different structural forms can be formed inside.

[0038] Specifically, by utilizing the positioning end cavities 901 of wax molds with different structures, corresponding matching with positioning end 105 structures of different structures can be achieved. This results in positioning end 105 structures of different structures exposed externally, which can form different positioning methods with the mold shell during the production of the mold shell. This allows for adjustment of the relative position of the core 1 and the mold shell during the casting of the finished product, preventing the risks of core breakage and wall thickness deviation.

[0039] In practice, by setting up multiple sets of lower positioning end movable blocks 5 and upper positioning end movable blocks 6, as well as lower wax mold movable blocks 8 and upper wax mold movable blocks 9 with different structures, it is possible to produce positioning end 105 structures with different structures without replacing the entire set of molds (positioning end 105 mold and wax mold). When casting finished castings, the core 1 with different positioning end 105 structures can be replaced as needed to change the degree of freedom of fixing the core 1. In turn, by adjusting the relative position between the core 1 and the shell, the risk of core breakage and wall thickness deviation can be effectively prevented.

[0040] In this embodiment, as Figure 3 , Figure 5 As shown, the lower positioning end block 5 has a first positioning part 11; the upper positioning end block 6 has a second positioning part 12; the first positioning part 11 and the second positioning part 12 can cooperate with each other to form a positioning structure.

[0041] Specifically, the first positioning part 11 and the second positioning part 12 can be configured as a protrusion and groove structure or adopt two positioning hole structures to use independent positioning pins for positioning, so as to realize the mutual positioning of the lower positioning end block 5 and the upper positioning end block 6.

[0042] In this embodiment, the upper core mold has a third positioning part (not shown in the figure), and the lower core mold 3 has a fourth positioning part (not shown in the figure); the third positioning part and the fourth positioning part can cooperate with each other to form a positioning structure.

[0043] Specifically, the third and fourth positioning parts can be set as a protrusion and groove structure or use two positioning hole structures to use independent positioning pins for positioning, which can realize the mutual positioning of the upper core mold and the lower core mold.

[0044] In this embodiment, as Figure 9 As shown, the lower wax mold 7 and / or the upper wax mold are provided with a fifth positioning part 13; as Figure 10 As shown, the lower wax mold movable block 8 and / or the upper wax mold movable block 9 are provided with a sixth positioning part 14; the sixth positioning part 14 and the fifth positioning part 13 can cooperate with each other to form a positioning structure.

[0045] Specifically, if a fifth positioning part 13 is provided on the lower wax mold 7, a sixth positioning part 14 needs to be provided on the lower wax mold movable block 8; if a fifth positioning part 13 is provided on the upper wax mold, a sixth positioning part 14 needs to be provided on the upper wax mold movable block 9; if a fifth positioning part 13 is provided on both the lower wax mold 7 and the upper wax mold, a sixth positioning part 14 needs to be provided on both the lower wax mold movable block 8 and the upper wax mold movable block 9.

[0046] Specifically, the fifth positioning part 13 and the sixth positioning part 14 can adopt a protrusion and groove structure or a pin and pin hole structure, or both of the above structures can be adopted at the same time.

[0047] In this embodiment, as Figures 10-11 As shown, the lower wax mold movable block 8 is provided with a seventh positioning part 15; the upper wax mold movable block 9 is provided with an eighth positioning part 16; the seventh positioning part 15 and the eighth positioning part 16 can cooperate with each other to form a positioning structure.

[0048] Specifically, the seventh positioning part 15 and the eighth positioning part 16 can respectively adopt the structure of grooves and protrusions.

[0049] In practice, the aforementioned positioning part can create a stable positioning between each movable block and each mold, ensuring the accuracy of the relative position between the movable block and the mold, as well as the accuracy of the relative position of the upper and lower molds when they are closed.

[0050] In this embodiment, as Figures 3-7 As shown, the core positioning cavity 601 includes: a first core positioning cavity 6011, a second core positioning cavity 6012, a core connecting cavity 6013, and a core Z-axis positioning cavity 6014.

[0051] The first positioning cavity 6011 and the second positioning cavity 6012 of the core are both connected to the core injection cavity.

[0052] Specifically, during the core injection process, core material is injected into both the first positioning cavity 6011 and the second positioning cavity 6012 of the core to form a first positioning end positioning part 1051 and a second positioning end positioning part 1052, which can be fixedly connected to the front cavity 101 and the rear cavity 102 of the core 1 body, respectively. Figures 13-14 As shown.

[0053] Specifically, the core connecting cavity 6013 is disposed above the first positioning cavity 6011 and the second positioning cavity 6012 of the core, and connects the first positioning cavity 6011 and the second positioning cavity 6012 of the core.

[0054] Specifically, during the core injection process, core material can be injected into the core connecting cavity 6013 to form a connecting part 1053, and to fix the first positioning end positioning part 1051 and the second positioning end positioning part 1052 together, such as... Figures 13-14 As shown.

[0055] Specifically, the core Z-axis positioning cavity 6014 is disposed through both sides of the core connecting cavity 6013. It can be perpendicular to the core connecting cavity 6013.

[0056] Specifically, during the core injection process, core material can be injected into the positioning cavity 6014 in the Z-axis direction of the core to form a positioning part 1054 in the Z-axis direction, which is perpendicular to the connecting part 1053, such as... Figures 13-14 As shown.

[0057] In this embodiment (two structures can be used to achieve core positioning; this is the first structure, where the wax model positioning end cavity 901 contains a complete positioning end), the wax model positioning end cavity 901 includes a first wax model positioning cavity 9011, a second wax model positioning cavity 9012, a wax model connecting cavity 9013, and a wax model Z-axis positioning cavity 9014. Both the first wax model positioning cavity 9011 and the second wax model positioning cavity 9012 are connected to the wax model injection cavity.

[0058] Specifically, the structure of the wax model positioning cavity 901 is the same as that of the core positioning cavity 601, only slightly larger in size (e.g., 0.05mm larger) to accommodate the molded core positioning cavity. When making the wax model 2, the core 1 is placed in the wax model 2, and the positioning end 105 structure can be perfectly fitted into the wax model positioning cavity 901, so that the wax model 2 will not be wrapped around the positioning end 105 structure during wax injection.

[0059] In this embodiment (two structures can be used to achieve core positioning; this is the second structure, where the wax mold positioning end cavity 901 only covers a part of the positioning end), as follows: Figures 10-11 As shown, the wax model positioning cavity 901 can also only include the wax model Z-axis positioning cavity 9014, without the wax model first positioning cavity 9011, wax model second positioning cavity 9012, and wax model connecting cavity 9013. Thus, the resulting wax model 2 has only the Z-axis positioning part 1054 exposed externally, while the first positioning part 11, second positioning part 12, and connecting part 1053 are all enclosed by the wax model 2.

[0060] Specifically, the positioning cavity 601 of the core is used to form a first positioning end positioning part 1051, a second positioning end positioning part 1052, a connecting part 1053, and a Z-axis positioning part 1054, which are fixedly connected to the main body of the core 1, i.e., the positioning end 105 positioning structure. Then, the wax model 2 is made using the wax model positioning end cavity 901 structure of the first case described above, and a wax model 2 is formed in which the positioning end 105 positioning structure is completely exposed to the outside. The first positioning end 1051 and the second positioning end 1052 are fixedly connected to the front cavity 101 and the rear cavity 102, respectively, which can restrict the translational and rotational degrees of freedom of the front cavity 101 and the rear cavity 102 in the X-axis and Y-axis directions within the mold shell. Together with the venting edge 103 of the core 1 body, they enable the overall core 1 to achieve translational and rotational degrees of freedom relative to the mold shell in the X-axis and Y-axis directions. The Z-axis positioning end 1054 is fixedly connected to the first positioning end 1051 and the second positioning end 1052 via the connecting part 1053, which can restrict the overall core 1's translational degree of freedom relative to the mold shell in the Z-axis direction. Simultaneously, the connecting part 1053 can restrict the overall core 1's rotational degree of freedom in the Z-axis direction. Through the comprehensive restriction of the core 1's degrees of freedom, a relatively stable positioning mode can be maintained between the core 1 and the mold shell during the casting of the finished part.

[0061] The wax model 2 is fabricated using the cavity 901 structure of the wax model positioning end described above, forming a wax model 2 with only the Z-axis positioning part 1054 exposed externally. Since the first positioning end 1051, the second positioning end 1052, and the connecting part 1053 are enclosed by the wax model 2, they cannot directly contact the mold shell during its fabrication. Therefore, only the Z-axis positioning part 1054 contacts the mold shell, restricting the translational freedom of the entire core 1 relative to the mold shell in the Z-axis direction. Under the action of the venting edge 103, the core 1 can achieve translational and rotational freedom in the X and Y axes. With this structure, the front cavity 101 and rear cavity 102 of the core 1 can have translational freedom in the X and Y axes respectively within the mold shell, providing appropriate adjustability compared to the previous structure.

[0062] In practice, the positioning end 105 structure is fully or partially exposed, which determines the connection between the shell and the core 1. This allows for timely adjustment of the relative position of the core 1 and the shell under specific circumstances, preventing core breakage and excessive wall thickness.

[0063] In embodiment two, the core positioning cavity 601 includes a first core positioning cavity 6011 and a second core positioning cavity 6012; both the first core positioning cavity 6011 and the second core positioning cavity 6012 are connected to the core injection cavity (please refer to...). Figures 3-7 ,exist Figures 3-7The core connecting cavity 6013 and the core Z-axis positioning cavity 6014 have been eliminated from the structural design.

[0064] Specifically, this embodiment is similar to the previous embodiment, except that the core connecting cavity 6013 and the core Z-axis positioning cavity 6014 are omitted. The positioning end 105 of the manufactured core 1 only includes the first positioning end positioning part 1051 and the second positioning end positioning part 1052, as shown below. Figures 15-17 As shown.

[0065] In this embodiment, as Figures 18-20 The wax model positioning cavity 901 shown includes a first positioning cavity 9011 and a second positioning cavity 9012; both the first positioning cavity 9011 and the second positioning cavity 9012 are connected to the wax model injection cavity.

[0066] Specifically, the structure of the wax model positioning end cavity 901 in this embodiment is similar to that in the previous embodiment, except that the wax model connecting cavity 9013 and the wax model Z-axis positioning cavity 9014 are omitted. The wax model 2 produced has only the first positioning end positioning part 1051 and the second positioning end positioning part 1052 exposed at the positioning end 105 position, as shown... Figure 20 As shown.

[0067] Specifically, unlike the previous embodiment, this embodiment omits the connecting portion 1053 and the Z-axis positioning portion 1054 of the positioning end 105. This allows for more flexible positioning of the core 1 and the shell. Since the Z-axis positioning portion 1054 is absent, the translational freedom of the core 1 as a whole in the Z-axis direction is no longer restricted; similarly, since the connecting portion 1053 is absent, the rotational freedom of the core 1 as a whole in the Z-axis direction is no longer restricted.

[0068] For example, if mold deformation or changes in the coefficient of thermal expansion occur between the core 1 and the shell in the previous embodiment, resulting in excessive wall thickness at the lower end (increase or decrease), excessive wall thickness at the lower left or upper right end, or vertical breakage (core breakage) between the venting edge 103 and the core 1 body, it is not necessary to replace the entire mold set. Simply replace the positioning end block and wax mold block from the previous embodiment with the positioning end block and wax mold block of this embodiment. This allows for more flexible freedom to change the translational position of the core 1 along the Z-axis or its rotational angle around the Z-axis within the shell, thereby adjusting the relative gap between the core 1 and the shell at the bottom, lower left, or upper right end, or the vertical relative position between the venting edge 103 and the shell, thus preventing core breakage and excessive wall thickness.

[0069] In embodiment three, the core positioning cavity 601 includes a first core positioning cavity 6011; the first core positioning cavity 6011 is connected to the core injection cavity (please refer to...). Figures 3-7,exist Figures 3-7 Based on the structural design, the first positioning cavity 6011, the connecting cavity 6013, and the Z-axis positioning cavity 6014 of the core are eliminated. Specifically, it can also be modified to retain the second positioning cavity 6012 of the core connected to the core injection cavity, with the same effect, which will not be elaborated further.

[0070] Specifically, unlike the previous embodiment, the core positioning end cavity 601 only retains the first positioning cavity 6011 of the core, thus obtaining a positioning end 105 structure that only has the first positioning end positioning part 1051, such as... Figures 21-22 As shown.

[0071] In this embodiment, as Figure 23-25 As shown, the wax model positioning cavity 901 includes a wax model first positioning cavity 9011; the wax model first positioning cavity 9011 is connected to the wax model injection cavity.

[0072] Specifically, the wax model positioning end cavity 901 differs from the previous embodiment in that it only retains the first positioning cavity 9011 of the wax model, thus obtaining a wax model 2 structure with only the first positioning end positioning part 1051 exposed to the outside.

[0073] Specifically, unlike the previous two embodiments, the structure of this embodiment eliminates the second positioning end positioning part 1052, the connecting part 1053, and the Z-axis direction positioning part 1054 of the positioning end 105. This makes the positioning of the core 1 and the shell more flexible. Since there is no Z-axis positioning part 1054, the translational freedom of the core 1 as a whole in the Z-axis direction is no longer restricted; since there is no connecting part 1053, the rotational freedom of the core 1 as a whole in the Z-axis direction is no longer restricted; since there is no second positioning end positioning part 1052, a mutually constraining structure is no longer formed between the front cavity 101 and the rear cavity 102, so that the two cavities can move relative to each other in the X and Y axes, or swing about the X-axis direction of the first positioning end positioning part 1051, or swing about the Y-axis direction of the first positioning end positioning part 1051.

[0074] Specifically, when mold deformation or changes in the coefficient of thermal expansion occur between the core 1 and the shell, resulting in more instances of core breakage or excessive wall thickness, it is possible to avoid replacing the entire mold set. Simply replace the positioning end block and wax mold block from the previous two embodiments with the positioning end block and wax mold block from this embodiment. This allows for more flexible freedom in changing the translational position of the core 1 within the shell along the Z-axis or its rotational angle centered on the Z-axis, as well as the translational position or rotational angle position along the X and Y axes. This, in turn, adjusts the relative gap between the core 1 and the shell at various points, or the vertical and horizontal relative positions of the venting edge 103 and the shell, thereby preventing core breakage and excessive wall thickness.

[0075] In specific implementation, based on the structure of the above embodiments, the present invention can adjust or fix the position and angle of the core 1 in the shell by flexibly replacing different movable blocks, without replacing the entire set of molds, in the event of core breakage or wall thickness deviation caused by the positional deviation between the core 1 and the shell. This prevents core breakage or wall thickness deviation and avoids the problems of long debugging cycle, high cost and poor process adaptability.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the protection scope of the present invention.

Claims

1. A variable-structure core and wax mold, wherein the wax mold covers the outer surface of the core, characterized in that, Including core molds and wax molds; The core mold includes: The lower core mold and the upper core mold, when engaged, form the core injection cavity of the core and the positioning end block cavity located above the core injection cavity. The lower positioning end block and the upper positioning end block are fitted into the cavity of the core head block and interlock with each other, and the cavity inside forms the core positioning end cavity of the core. The lower positioning end block and the upper positioning end block have several sets, and after they are locked together in a one-to-one correspondence, they can form several different structural forms of core positioning end cavities. The wax mold includes: The lower wax mold and the upper wax mold, when engaged, form the wax injection cavity of the wax mold and the wax block cavity located above the wax injection cavity. The lower wax mold block and the upper wax mold block are fitted into the cavity of the wax mold block. After they are fastened together, the cavity inside is formed to accommodate the wax mold positioning end of the core positioning end. The lower wax mold movable block and the upper wax mold movable block have several sets, and after they are snapped together one by one, the interior can form several wax mold positioning end cavities with different structural forms.

2. The variable-structure core and wax mold according to claim 1, characterized in that, The lower positioning end block has a first positioning part; the upper positioning end block has a second positioning part; the first positioning part and the second positioning part can cooperate with each other to form a positioning structure; The upper core mold has a third positioning part, and the lower core mold has a fourth positioning part; the third positioning part and the fourth positioning part can cooperate with each other to form a positioning structure.

3. The variable-structure core and wax mold according to claim 1, characterized in that, The lower wax mold and / or upper wax mold are provided with a fifth positioning part; The lower wax mold movable block and / or the upper wax mold movable block are provided with a sixth positioning part; The sixth positioning part and the fifth positioning part can cooperate with each other to form a positioning structure.

4. The variable-structure core and wax mold according to claim 1, characterized in that, The lower wax mold movable block is provided with a seventh positioning part; the upper wax mold movable block is provided with an eighth positioning part; the seventh positioning part and the eighth positioning part can cooperate with each other to form a positioning structure.

5. The variable-structure core and wax mold according to claim 1, characterized in that, The core positioning end cavity includes: The core has a first positioning cavity and a second positioning cavity; both the first positioning cavity and the second positioning cavity are connected to the core injection cavity. A core connecting cavity is disposed above the first positioning cavity and the second positioning cavity of the core, and connects the first positioning cavity and the second positioning cavity of the core. Additionally, a positioning cavity along the Z-axis of the core is provided through both sides of the core connecting cavity.

6. The variable-structure core and wax mold according to claim 5, characterized in that, The wax model positioning cavity includes a first positioning cavity, a second positioning cavity, a connecting cavity, and a positioning cavity in the Z-axis direction; or, it only includes a positioning cavity in the Z-axis direction. Both the first positioning cavity and the second positioning cavity of the wax model are connected to the injection cavity of the wax model.

7. The variable-structure core and wax mold according to claim 1, characterized in that, The core positioning cavity includes a first core positioning cavity and a second core positioning cavity; both the first core positioning cavity and the second core positioning cavity are connected to the core injection cavity.

8. The variable-structure core and wax mold according to claim 7, characterized in that, The wax model positioning cavity includes a first positioning cavity and a second positioning cavity; both the first positioning cavity and the second positioning cavity are connected to the wax model injection cavity.

9. The variable-structure core and wax mold according to claim 1, characterized in that, The core positioning end cavity includes a first core positioning cavity; the first core positioning cavity is connected to the core injection cavity.

10. The variable-structure core and wax mold according to claim 9, characterized in that, The wax model positioning cavity includes the wax model first positioning cavity; the wax model first positioning cavity is connected to the wax model injection cavity.

Images