An articulated earing wax former

Abstract

The utility model discloses a hinge lug plate wax mold forming die for forming the hinge lug plate wax mold, and the hinge lug plate wax mold comprises a plate body and a connecting lug seat, a plurality of fixing holes are arranged on the two sides of the connecting lug seat respectively, an axle hole for being connected with the hinge seat axle is arranged at one end of the connecting lug seat, the hinge lug plate wax mold forming die comprises a lower die, a plurality of first forming cores in cooperation with the lower die, an upper die in cooperation with the upper side of the lower die and a forming core assembly for forming the axle hole, when the lower die and the upper die are closed, the wax mold forming cavity for forming the plate body and the connecting lug seat can be formed by splicing, the plurality of first forming cores can be perpendicular to the wax mold forming cavity to form the plurality of fixing holes one by one, the forming core assembly can cooperate with the wax mold forming cavity to form the axle hole penetrating through the connecting lug seat, and the hinge lug plate wax mold structure and the high-precision hole position of more complex and detailed integration are formed, so that the artificial finishing error and the cumulative error of multiple processing are avoided.

Description

Technical Field

[0001] This utility model belongs to the field of wax mold forming technology, specifically relating to a wax mold forming mold for hinged ear plates. Background Technology

[0002] In fields such as machinery manufacturing, automotive industry, and heavy equipment, hinged lugs are core components for achieving rotating connections and fixed assembly of parts. Their structural integrity and dimensional accuracy directly determine the assembly stability and operational reliability of the equipment. A hinged lug typically consists of a plate body and a connecting lug seat integrally formed on the top surface of the plate body. The connecting lug seat requires vertical through-holes on both sides to achieve precise fixation with the equipment, and a shaft hole is required at the end furthest from the plate body to meet the shaft connection requirements with the hinge seat.

[0003] Traditional molds often use simple, integrated cavities, which can only achieve the general outline of the plate and connecting lugs. There is no corresponding molding design for the detailed structure, which means that a lot of manual finishing work is required after the wax model is formed. This not only makes it difficult to ensure the consistency of structural features between different wax models, affecting the quality of the wax model, but also makes it difficult to ensure the consistency of structural features between different wax models. For hole forming, a single core or a pre-reserved machining allowance is often used. Subsequent processing is required to improve the hole, which not only increases production costs, but also makes it easy for the hole to shift due to machining errors. Utility Model Content

[0004] In view of the technical problems existing in the prior art, this utility model provides a wax mold forming mold for hinged ear plates.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A wax mold for forming a hinged lug plate is provided for processing and forming a wax mold with a structure consistent with the hinged lug plate. The wax mold includes a plate body and a connecting lug seat integrally formed on the top surface of the plate body. Several fixing holes that can vertically penetrate the plate body are respectively arranged on both sides of the connecting lug seat. A shaft hole for shaft connection with a hinge seat is opened at the end of the connecting lug seat away from the plate body. The wax mold includes a lower mold, several first forming cores that cooperate with the lower mold, an upper mold that cooperates with the upper part of the lower mold, and a forming core assembly for forming the shaft hole. When the lower mold and the upper mold are closed, they can be assembled to form a wax mold forming cavity for forming the plate body and the connecting lug seat. The several first forming cores can be perpendicular to the wax mold forming cavity to form several fixing holes one-to-one. The forming core assembly can cooperate with the wax mold forming cavity to form the shaft hole penetrating the connecting lug seat.

[0006] Furthermore, the top surface of the lower mold is provided with a first L-shaped mating part, which can divide the top surface of the lower mold into a first mating surface and a third mating surface with a height difference. The horizontal plane of the first L-shaped mating part is defined as the third mating surface, and the top surface height of the first mating surface is higher than the top surface height of the third mating surface. The bottom surface of the upper mold is provided with a second L-shaped mating part that mates with the first L-shaped mating part. The second L-shaped mating part can divide the bottom surface of the upper mold into a second mating surface and a fourth mating surface with a height difference. The horizontal surface of the second L-shaped mating part is defined as the second mating surface. When the lower mold and the upper mold are closed, the fourth mating surface contacts the lower mold first. After the lower mold and the upper mold are closed, the first mating surface and the second mating surface are tightly fitted, and the third mating surface and the fourth mating surface are tightly fitted, so as to form a closed cavity that matches the contour of the hinged ear plate wax model.

[0007] Furthermore, the wax mold forming cavity includes a first cavity for forming the plate body and a second cavity integrally formed with the first cavity for forming the connecting ear seat. The first cavity includes a first cavity groove recessed from the first mating surface away from the upper mold and a second cavity groove recessed from the second mating surface away from the lower mold. After the mold is closed, the first cavity groove and the second cavity groove mate to form the plate body. The second cavity includes a third cavity recessed from the middle of the first cavity groove toward the direction away from the upper mold, and a fourth cavity recessed from the fourth mating surface toward the direction away from the lower mold. One end of the third cavity groove is disposed near the edge of the first cavity groove, and its other opposite end extends along the direction close to the first L-shaped mating part, and finally extends to the third mating surface of the lower mold. After the mold is closed, the third cavity groove and the fourth cavity groove mate to form the connecting ear seat.

[0008] Furthermore, the first cavity is provided with a plurality of through holes that vertically penetrate the lower mold, and the plurality of through holes are arranged at intervals on both sides of the third cavity. The second cavity is provided with a plurality of abutment grooves corresponding to the positions of the through holes. When the mold is closed, one end of a plurality of the first molding cores can pass through the through holes and abut against the abutment groove to form the fixing hole.

[0009] Furthermore, the first molding core includes a first circular core that is connected to the through hole and a second circular core that is coaxially fixed to one end of the first circular core near the upper mold. The outer diameter of the second circular core is smaller than the outer diameter of the first circular core. When the hinged ear wax mold is formed, the stepped diameter difference between the first circular core and the second circular core can form a hole structure with a stepped inner diameter at the corresponding position of the hinged ear wax mold.

[0010] Furthermore, the second cavity groove is provided with a through cavity that vertically penetrates the upper mold. A second molding core is connected to the through cavity. Two symmetrically arranged protruding components are fixed to the edge of the through cavity, and an elongated protrusion is fixed between the two protruding components. Each protruding component is composed of two integrally formed protrusions connected end to end. A transverse groove is formed at the junction of the two protrusions. A longitudinal groove is formed on the surface of the elongated protrusion. When the second molding core is installed into the through cavity along a preset assembly direction, the two symmetrical protruding components and the elongated protrusion together form an enclosing structure, which surrounds the second molding core. The enclosing structure can form an enclosing cavity on the bottom surface of the plate.

[0011] Furthermore, the second molding core includes a core body connected to the through cavity, and two protrusion assemblies fixed to the core body and protruding towards the direction of the lower mold. The two protrusion assemblies are spaced apart, and each protrusion assembly is composed of a first variable cross-section protrusion and a second variable cross-section protrusion arranged at intervals. A first groove is provided between the two protrusion assemblies. The first groove can be connected with the longitudinal groove to form longitudinal ribs distributed on the bottom surface of the plate. A second groove perpendicular to the first groove is provided between the first variable cross-section protrusion and the second variable cross-section protrusion. The second groove can be connected with the transverse groove to form transverse ribs distributed on the bottom surface of the plate. After the transverse ribs and the longitudinal ribs are formed, they are fixed in the enclosing cavity. The protrusion assembly can correspondingly form a contour-fitting recessed cavity in the enclosing cavity.

[0012] Furthermore, the third cavity includes an inclined groove and a semi-circular arc groove fixed to one side of the inclined groove. The inclined groove also has a recessed pit that is recessed away from the upper mold. The recess is used to form protrusions distributed on the inclined surface of the connecting ear seat. The semi-circular arc groove can cooperate with the fourth cavity to assemble the molding core assembly, thereby forming the shaft hole.

[0013] Furthermore, the fourth type of cavity is provided with a first protrusion, which can form a recessed portion distributed on the bottom surface of the connecting ear seat.

[0014] Furthermore, after the lower mold and the upper mold are closed, they can be assembled to form two spaced-apart wax mold forming cavities. The forming core assembly includes a third forming core disposed between the two wax mold forming cavities, and two fourth forming cores symmetrically arranged on both sides of the third forming core. Each side of the third forming core has a slot that can mate with the fourth forming core. The fourth forming core includes a third circular core and a fourth circular core fixed to one side of the third circular core. The outer diameter of the fourth circular core is smaller than that of the third circular core, and the end of the fourth circular core away from the third circular core is fitted into the slot. In the closed state, part of the third forming core, part of the third circular core, and the fourth circular core extend into the wax mold forming cavity, and the structural shape of each extended part is adapted to the stepped shaft hole design on both sides of the connecting ear seat, thereby forming stepped shaft holes distributed on both sides of the connecting ear seat.

[0015] In summary, the beneficial effects of this utility model are as follows: 1. Complex structures are integrally molded, eliminating the need for repeated corrections or multiple processing steps. The mold, through segmented cavities (first cavity forming plate, second cavity forming connecting ear seat), multiple types of cores (first forming core, second forming core, forming core assembly), and mating structures (L-shaped mating part, protrusion assembly, elongated protrusion), can simultaneously mold the enclosing cavity, cross-shaped transverse and longitudinal ribs, recessed cavities, protrusions on the inclined surface of the connecting ear seat, recesses on the bottom surface, and complex structures such as stepped fixing holes and stepped shaft holes. This eliminates the traditional mold "rough forming + manual trimming / multiple sequential processing" mode, avoiding human error and cumulative processing errors, ensuring the integrity of the outlines and clarity of details of each structure in the wax model. 2. High-precision positioning and sealing ensure molding stability. Precise Positioning: The first L-shaped mating part of the lower mold and the second L-shaped mating part of the upper mold form a "complementary concave-convex" structure. During mold closing, the fourth mating surface contacts the guide first, limiting the misalignment of the upper mold and ensuring a tight fit between the two mating surfaces (the first and second mating surfaces, and the third and fourth mating surfaces), reducing cavity splicing errors. The molding core assembly, through the third molding core slot + fourth molding core embedding design, forcibly constrains the coaxiality of the stepped shaft hole. The fixing hole is positioned by a through hole + abutment groove, reducing hole diameter errors. Reliable Sealing: The two mating surfaces form a double-sided sealing barrier, combined with the L-shaped corner closure, effectively preventing wax from overflowing from the parting surface, reducing the overflow defect rate, and adapting to the complex sealing requirements of dual cavities. III. After the lower and upper molds are closed, two spaced wax mold forming cavities are formed. The cavities are connected by a wax injection channel, allowing for the filling of two wax molds with a single wax injection, increasing production capacity per unit time. At the same time, it eliminates the operation steps of separate cavity wax injection, improving the production efficiency of a single mold closing. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of the hinged ear plate wax model produced by the molding die for this hinged ear plate wax model. Figure 2 yes Figure 1 A schematic diagram of the structure of the bottom surface of the wax mold of the hinged ear plate.

[0017] Figure 3 This is a schematic diagram of the structure of a hinged ear plate wax mold forming mold provided by this utility model.

[0018] Figure 4 yes Figure 3 Exploded view.

[0019] Figure 5 This is a structural schematic diagram of the lower mold in this utility model.

[0020] Figure 6 yes Figure 5 The diagram shows the structure of the lower mold containing the molding core assembly and the molding hinged ear plate wax mold.

[0021] Figure 7 This is a schematic diagram of the structure of the bottom surface of the upper mold in this utility model.

[0022] Figure 8 yes Figure 7 A schematic diagram of the upper mold assembly containing the molding core component.

[0023] Figure 9 This is a top view of the hinged ear plate wax mold without the second molding core assembled.

[0024] Figure 10 yes Figure 9 Sectional view along the AA direction.

[0025] Figure 11 This is a three-dimensional structural diagram of the second molding core in this utility model.

[0026] In the diagram, 100-hinged ear plate wax model, 110-plate body, 111-fixing hole, 112-enclosing cavity, 113-longitudinal rib, 114-transverse rib, 115-recessed cavity, 120-connecting ear seat, 121-shaft hole, 122-recessed part, 123-protrusion, 200-lower mold, 210-first mating surface, 211-first cavity groove, 2110-through hole, 212-third cavity groove, 212A-inclined groove, 212A0-recess, 212B-semi-circular groove, 220-third mating surface, 300-first molding core, 310-first circular core, 320-second circular core, 400-upper mold, 410-second mating surface, 411-second cavity groove, 4110-abutment. 4111-Through cavity, 4112-Protrusion, 4113-Long strip protrusion, 4114-Transverse groove, 4115-Longitudinal groove, 420-Fourth mating surface, 421-Fourth cavity groove, 4210-First protrusion, 500-Molding core assembly, 510-Third molding core, 511-Slot, 520-Fourth molding core, 521-Third circular core, 522-Fourth circular core, 600-Wax mold molding cavity, 610-First cavity, 620-Second cavity, 700-Second molding core, 710-Core body, 720-Protrusion assembly, 721-First variable cross-section protrusion, 722-Second variable cross-section protrusion, 730-First groove, 740-Second groove, 800-Wax injection channel. Detailed Implementation

[0027] The present invention will be further explained below with reference to specific illustrations.

[0028] Please see Figure 1 and Figure 2 The hinged lug wax model 100 to be processed by this hinged lug wax model molding die includes a plate 110 and a connecting lug seat 120 integrally formed on the top surface of the plate 110. The bottom surface of the plate 110 is provided with a surrounding cavity 112, in which transverse ribs 114 and longitudinal ribs 113 are arranged in a cross shape, and each of the transverse ribs 114 and longitudinal ribs 113 is adjacent to a recessed cavity 115. Several fixing holes 111 that can vertically penetrate the plate 110 are respectively provided on both sides of the connecting lug seat 120, and a shaft hole 121 for shaft connection with the hinge seat is opened at the end of the connecting lug seat away from the plate 110.

[0029] Please see Figure 3 and Figure 4This utility model provides a wax mold for forming a hinged ear plate, used to process and form a wax mold 100 of a hinged ear plate with the same structure as the hinged ear plate. The wax mold includes a lower mold 200, a plurality of first molding cores 300 connected to the lower mold 200, an upper mold 400 connected above the lower mold 200, and a molding core assembly 500 for forming a shaft hole 121. After the lower mold 200 and the upper mold 400 are closed, they can be assembled to form a wax mold forming cavity 600 for forming the plate body 110 and the connecting ear seat 120. The plurality of first molding cores 300 can be perpendicular to the wax mold forming cavity 600 to form a plurality of fixing holes 111 one-to-one. The molding core assembly 500 can cooperate with the wax mold forming cavity 600 to form a shaft hole 121 that penetrates and connects to the ear seat 120. By integrating the more complex and detailed structure of the hinged ear plate wax model 100 and the high-precision hole positions, the errors of manual trimming and the cumulative errors of multiple processing are avoided. The dimensional accuracy and batch consistency of each structure of the hinged ear plate wax model 100 are greatly improved, laying the foundation for the quality of the hinged ear plate in subsequent lost-wax casting.

[0030] After the lower mold 200 and the upper mold 400 are closed, they can be assembled to form two spaced-apart wax mold forming cavities 600. A wax injection channel 800 communicating with the two wax mold forming cavities 600 is provided between them. Based on the synchronous molding of the two cavities, the design of the wax injection channel 800 eliminates the step of injecting wax into the two cavities separately. The two hinged ear plate wax molds 100 can be filled with wax in one injection. Compared with the traditional single-cavity mold, the production efficiency can be further improved on the basis of the dual-cavity mold. At the same time, the number of wax molds produced per unit time is doubled, significantly reducing the production time cost of a single wax mold.

[0031] Please see Figure 5 and Figure 6 The top surface of the lower mold 200 is provided with a first L-shaped mating part. This first L-shaped mating part divides the top surface of the lower mold 200 into a first mating surface 210 and a third mating surface 220, which have a height difference. The horizontal plane of the first L-shaped mating part is defined as the third mating surface 220. The top surface height of the first mating surface 210 is higher than the top surface height of the third mating surface 220. (See also...) Figure 7 and Figure 8The bottom surface of the upper mold 400 is provided with a second L-shaped mating part that mates with the first L-shaped mating part. This second L-shaped mating part divides the bottom surface of the upper mold 400 into a second mating surface 410 and a fourth mating surface 420, which have a height difference. The horizontal plane of the second L-shaped mating part is defined as the second mating surface 410. When the lower mold 200 and the upper mold 400 are closed, the fourth mating surface 420 contacts the lower mold 200 first. After the lower mold 200 and the upper mold 400 are closed, the first mating surface 210 and the second mating surface 410 are tightly fitted together, and the third mating surface 220 and the fourth mating surface 420 are tightly fitted together to form a closed cavity that conforms to the contour of the hinged ear plate wax model 100. The first L-shaped mating part and the second L-shaped mating part form a "complementary concave-convex" geometric positioning structure. During mold closing, the fourth mating surface 420 contacts the lower mold 200 first. The stepped contact relationship formed by the height difference provides a clear mold closing guide trajectory for the upper mold 400. This design avoids the lateral displacement problem that easily occurs during traditional planar mold closing. It limits the misalignment space of the upper mold 400 from the moment of contact, ensuring that the upper mold 400 precisely fits the lower mold 200 along a preset direction, laying the foundation for the subsequent tight fit of the two mating surfaces. After mold closing, the first mating surface 210 and the second mating surface 410, and the third mating surface 220 and the fourth mating surface 420 form a "double-sided mating" sealing structure: the two sets of mating surfaces correspond to different areas of the wax mold forming cavity 600 (such as the forming parts of the plate 110 and the connecting ear 120), and are tightly fitted to the plane through the corner closure of the L-shaped structure, forming a comprehensive cavity sealing barrier. Compared with traditional single-plane sealing, this design effectively blocks the path of wax overflow from the parting surface, and is especially suitable for the complex sealing requirements of the double wax mold forming cavity 600.

[0032] Please see Figure 9 and Figure 10The wax mold forming cavity 600 includes a first cavity 610 for forming the plate 110 and a second cavity 620 integrally formed with the first cavity 610 for forming the connecting lug 120. The first cavity 610 includes a first cavity groove 211 recessed from the first mating surface 210 in a direction away from the upper mold 400, and a second cavity groove 411 recessed from the second mating surface 410 in a direction away from the lower mold 200. After mold closing, the first cavity groove 211 and the second cavity groove 411 mate to form the plate 110. The second cavity 620 includes a third cavity groove 212 recessed from the middle of the first cavity groove 211 in a direction away from the upper mold 400, and a fourth cavity groove 421 recessed from the fourth mating surface 420 in a direction away from the lower mold 200. One end of the third cavity 212 is located near the edge of the first cavity 211, and its other opposite end extends along the direction close to the first L-shaped mating part, and finally extends to the third mating surface 220 of the lower mold 200. After the mold is closed, the third cavity 212 and the fourth cavity 421 mate to form the connecting ear seat 120. For the integrated but differentiated structure of the hinged ear plate wax model 100 "plate body 110 + connecting ear seat 120", the cavity adopts a segmented design of "first cavity 610 (plate body 110) + second cavity 620 (connecting ear seat 120)", and each cavity is further divided into corresponding recessed cavity grooves of the upper and lower molds 200: the first cavity 610 is composed of the first cavity groove 211 of the lower mold 200 and the second cavity groove 411 of the upper mold 400, and the second cavity 620 is composed of the third cavity groove 212 of the lower mold 200 and the fourth cavity groove 421 of the upper mold 400. This "integrated linkage, segmented molding" structure can more accurately match the contour features of different parts of the wax model, solving the problem that traditional integrated cavities cannot simultaneously accommodate the molding precision of different structures, and providing a foundation for the complete replication of complex structures. The wax delivered by the wax injection channel 800 first enters the first cavity 610 (the molding area of ​​plate 110), and then flows into the second cavity 620 (the molding area connecting the ear base 120) through the connecting structure of the first cavity groove 211 and the third cavity groove 212, forming a "primary first, secondary later" filling path. At the same time, the recess depth of each cavity groove matches the thickness of the wax model, avoiding a sudden drop in wax flow rate or pressure concentration caused by excessive local space. In particular, the extended design of the third cavity groove 212 can guide the wax to smoothly fill the narrow area connecting the ear base 120, reducing the generation of air bubbles.

[0033] Please continue reading. Figure 5The first cavity 211 has several through holes 2110 that vertically penetrate the lower mold 200. These through holes 2110 are spaced apart on both sides of the third cavity 212. The second cavity 411 has several abutment grooves 4110 that correspond one-to-one with the positions of the through holes 2110. When the mold is closed, one end of several first molding cores 300 can pass through the through holes 2110 and abut against the abutment grooves 4110 to form the fixing holes 111. The through holes 2110 in the first cavity 211 correspond one-to-one with the abutment grooves 4110 in the second cavity 411, and the through holes 2110 are spaced apart on both sides of the third cavity 212 (the molding area of ​​the connecting ear seat 120), perfectly matching the distribution of the fixing holes 111 in the hinged ear plate wax mold 100. After the mold is closed, the first molding core 300 passes through the through hole 2110 and abuts against the abutment groove 4110, forming a double fixing structure of "lower mold 200 through hole 2110 positioning + upper mold 400 abutment groove 4110 limiting". It can replicate the position and diameter of the fixing hole 111, avoid the problem of the fixing hole 111 shifting due to the fuzzy positioning of the core in traditional molds, and realize the integrated molding of the fixing hole 111 and the wax model body.

[0034] Please continue reading. Figure 4 The first molding core 300 includes a first circular core 310 that mates with the through hole 2110 and a second circular core 320 coaxially fixed to one end of the first circular core 310 near the upper mold 400. The outer diameter of the second circular core 320 is smaller than that of the first circular core 310. When the hinge ear wax mold is formed, the stepped diameter difference between the first circular core 310 and the second circular core 320 can form a hole structure with a stepped inner diameter at the corresponding position of the hinge ear wax mold. The stepped first molding core 300, through the coaxial design of the large-diameter first circular core 310 and the small-diameter second circular core 320, utilizes the diameter difference between the two to simultaneously form a stepped hole structure during wax mold forming, without additional processing, precisely matching the functional design requirements of the hinge ear plate wax mold 100.

[0035] Please continue reading. Figure 7The second cavity 411 has a through cavity 4111 that vertically penetrates the upper mold 400. A second molding core 700 is fitted and connected within the through cavity 4111. Two symmetrically arranged protruding components are fixed to the edge of the through cavity 4111, and an elongated protrusion 4113 is fixed between the two protruding components. Each protruding component consists of two integrally formed protrusions 4112 connected end to end. A transverse groove 4114 is formed at the junction of the two protrusions 4112, and a longitudinal groove 4115 is formed on the surface of the elongated protrusion 4113. When the second molding core 700 is installed into the through cavity 4111 along a preset assembly direction, the two symmetrical protruding components and the elongated protrusion 4113 together form an enclosing structure, which surrounds the second molding core 700. The enclosing structure can form an enclosing cavity 112 on the bottom surface of the plate 110. This mold utilizes a collaborative structure of a through-cavity 4111 edge protrusion assembly, a long strip protrusion 4113, and a second molding core 700. Once the second molding core 700 is installed, the two symmetrical protrusion assemblies and the long strip protrusion 4113 form an enclosing structure. Utilizing the contour of this structure, the enclosing cavity 112 on the bottom surface of the plate 110 is simultaneously replicated during wax model molding, eliminating the need for any subsequent processing and precisely matching the structural design requirements of the wax model. Molding the complex enclosing cavity 112 on the bottom surface of the plate 110 avoids the damage caused by repeated clamping and transfer of the wax model during sequential processing, which can lead to collisions and losses. Integrated molding completely avoids such losses, reducing raw material waste and production costs.

[0036] Please see Figure 11The second molding core 700 includes a core body 710 connected to the through cavity 4111, and two protrusion assemblies 720 fixed to the core body 710 and protruding towards the lower mold 200. The two protrusion assemblies 720 are spaced apart, and each protrusion assembly 720 is composed of a first variable cross-section protrusion 721 and a second variable cross-section protrusion 722 arranged at intervals. A first groove 730 is provided between the two protrusion assemblies 720, which can be connected to the longitudinal groove 4115 to form longitudinal ribs 113 distributed on the bottom surface of the plate 110. A second groove 740 perpendicular to the first groove 730 is provided between the first variable cross-section protrusion 721 and the second variable cross-section protrusion 722. The second groove 740 can be connected with the transverse groove 4114 to form transverse ribs 114 distributed on the bottom surface of the plate 110. After the transverse ribs 114 and the longitudinal ribs 113 are formed, they are fixed in the enclosing cavity 112. The protrusion assembly 720 can be formed in the enclosing cavity 112 to form a recessed cavity 115 with a matching contour. The protrusion component 720 (including the first variable cross-section protrusion 721 and the second variable cross-section protrusion 722) of the second molding core 700 forms a "protrusion-recession" corresponding structure with the grooves (first groove 730 and second groove 740): the first groove 730 cooperates with the longitudinal groove 4115 of the long strip protrusion 4113 of the upper mold 400 to form the longitudinal rib 113 on the bottom surface of the plate 110; the second groove 740 cooperates with the transverse groove 4114 at the connection of the protrusion component 720 to simultaneously form the transverse rib 114, and the transverse rib 114 and the longitudinal rib 113 intersect perpendicularly to form a cross-shaped structure; at the same time, the variable cross-section contour of the protrusion component 720 can directly form a matching recessed cavity 115 in the enclosing cavity 112. This synchronous molding design of "rib + recessed cavity 115" solves the problem that traditional molds need to be processed in sequence and it is difficult to ensure the relative positional accuracy of each structure.

[0037] Please continue reading. Figure 5The third cavity 212 includes an inclined groove 212A and a semi-circular groove 212B fixed to one side of the inclined groove 212A. The inclined groove 212A also has a recess 212A0 recessed away from the upper mold 400. The recess 212A0 is used to form protrusions 123 distributed on the inclined surface of the connecting ear 120. The protrusions 123 can improve the load-bearing strength of the connecting ear 120, avoid structural failure during long-term use, and extend the overall service life of the hinge plate. The semi-circular groove 212B can cooperate with the fourth cavity 421 to assemble the molding core assembly 500, thereby forming the shaft hole 121. The inclination angle of the inclined groove 212A perfectly matches the contour of the inclined surface of the connecting ear 120, allowing for precise molding of the inclined surface main structure. The semi-circular groove 212B cooperates with the fourth cavity 421 of the upper mold 400 to form a circular space for molding the shaft hole 121, providing stable support for the subsequent assembly of the molding core assembly 500. Meanwhile, the recess 212A0 in the inclined groove 212A directly forms the protrusion 123 on the inclined surface of the connecting ear seat 120, without the need for subsequent manual trimming, which solves the problem that traditional molds cannot simultaneously form more detailed structures of the hinged ear plate wax model 100.

[0038] Please continue reading. Figure 7 The fourth type of cavity 421 is provided with a first protrusion 4210, which can form recesses 122 distributed on the bottom surface of the connecting ear 120. If the bottom surface of the connecting ear 120 is a complete plane, pressure concentration is easily formed in local areas during wax filling, resulting in defects such as shrinkage and air bubbles in the wax model. The presence of the first protrusion 4210 creates a differentiated "protrusion-recession" structure on the bottom surface of the connecting ear 120. During wax filling, it can naturally flow along the contour of the first protrusion 4210, reducing local pressure differences. Especially in the thick-walled area near the shaft hole 121, the wax filling pressure can be released through the space of the recesses 122, reducing the internal defect rate of the wax model and improving the molding quality.

[0039] Please continue reading. Figure 4The molding core assembly 500 includes a third molding core 510 disposed between two wax mold molding cavities 600, and two fourth molding cores 520 symmetrically arranged on both sides of the third molding core 510. Each side of the third molding core 510 has a slot 511 that mates with the fourth molding core 520. The fourth molding core 520 includes a third circular core 521 and a fourth circular core 522 fixed to one side of the third circular core 521. The outer diameter of the fourth circular core 522 is smaller than the outer diameter of the third circular core 521, and the end of the fourth circular core 522 away from the third circular core 521 is fitted into the slot 511. In the mold-closed state, a portion of the third molding core 510, a portion of the third circular core 521, and a fourth circular core 522 extend into the wax mold forming cavity 600. The structural shape of each extended portion is adapted to the design of the stepped shaft holes 121 on both sides of the connecting ear seat 120, thereby forming the stepped shaft holes 121 distributed on both sides of the connecting ear seat 120. The molding core assembly 500, through the combination design of the third molding core 510 and the fourth molding cores 520 on both sides, and the fourth molding core 520 adopting a stepped structure of a large-diameter third circular core 521 and a small-diameter fourth circular core 522, precisely matches the slot 511 of the third molding core 510. Each portion extending into the wax mold forming cavity 600 can completely form the outline of the stepped shaft hole 121 (large diameter section, small diameter section, and transition step), realizing the integrated molding of the shaft hole 121 and the stepped structure without any subsequent processing, fundamentally solving the precision defects of traditional processes.

[0040] This hinged ear plate wax model molding die features: 1. Integrated molding of complex structures, eliminating the need for repeated corrections or multiple processing steps. The die utilizes segmented cavities (first cavity 610 molding the plate 110, second cavity 620 molding the connecting ear seat 120), multiple types of cores (first molding core 300, second molding core 700, molding core assembly 500), and mating structures (L-shaped mating part, protruding assembly, elongated protrusion 4113) to simultaneously mold the enclosing cavity 112, cross-shaped transverse ribs 114 and longitudinal ribs 113, and recessed cavity 115 on the bottom surface of the plate 110; the protrusion 123 on the inclined surface of the connecting ear seat 120; the recessed part 122 on the bottom surface; and the stepped fixing hole 111 and stepped shaft hole 121, among other complex structures. This eliminates the traditional mold-making process of "rough molding + manual finishing / multiple sequential processing," avoiding human error and accumulated processing errors, ensuring the complete outline and clear details of each structure in the wax model. II. High-precision positioning and sealing ensure molding stability. Precise positioning: The first L-shaped mating part of the lower mold 200 and the second L-shaped mating part of the upper mold 400 form a "complementary concave-convex" structure. During mold closing, the fourth mating surface 420 contacts the guide first, limiting misalignment of the upper mold 400 and ensuring a tight fit between the two mating surfaces (first mating surface 210 and second mating surface 410, third mating surface 220 and fourth mating surface 420), reducing cavity splicing errors. The molding core assembly 500, through the embedding design of the third molding core 510 slot 511 + fourth molding core 520, forcibly constrains the coaxiality of the stepped shaft hole 121. The fixing hole 111 is doubly positioned through the through hole 2110 + abutment groove 4110, reducing hole diameter errors. Reliable sealing: The two mating surfaces form a double-sided sealing barrier, combined with the L-shaped corner closure, effectively preventing wax from overflowing from the parting surface, reducing the overflow defect rate, and adapting to the complex sealing requirements of dual cavities. Third, after the lower mold 200 and the upper mold 400 are closed, two spaced wax mold forming cavities 600 are formed. The cavity is provided with a connecting wax injection channel 800. The two wax molds can be filled in one wax injection, which can increase the production capacity per unit time. At the same time, the operation steps of separate cavity wax injection are eliminated, which improves the production efficiency of single mold closing.

[0041] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, whether directly or indirectly applied to other related technical fields, shall also be within the patent protection scope of this utility model.

Claims

1. A molding die for forming a hinged lug wax model, used to process and form a hinged lug wax model with a structure consistent with the hinged lug, the hinged lug wax model comprising a plate body and a connecting lug seat integrally formed on the top surface of the plate body, wherein the connecting lug seat has a plurality of fixing holes on both sides that can perpendicularly penetrate the plate body, and a shaft hole for shaft connection with a hinge seat is provided at the end of the connecting lug seat away from the plate body, characterized in that: The device includes a lower mold, a plurality of first molding cores connected to the lower mold, an upper mold connected above the lower mold, and a molding core assembly for molding the shaft hole. When the lower mold and the upper mold are closed, they can be assembled to form a wax mold molding cavity for molding the plate body and the connecting ear seat. The plurality of first molding cores can be perpendicular to the wax mold molding cavity to mold the plurality of fixing holes one by one. The molding core assembly can cooperate with the wax mold molding cavity to mold the shaft hole that penetrates the connecting ear seat.

2. The hinged ear plate wax mold forming die according to claim 1, characterized in that: The top surface of the lower mold is provided with a first L-shaped mating part. The first L-shaped mating part can divide the top surface of the lower mold into a first mating surface and a third mating surface with a height difference. The horizontal plane of the first L-shaped mating part is defined as the third mating surface. The top surface height of the first mating surface is higher than the top surface height of the third mating surface. The bottom surface of the upper mold is provided with a second L-shaped mating part that mates with the first L-shaped mating part. The second L-shaped mating part can divide the bottom surface of the upper mold into a second mating surface and a fourth mating surface with a height difference. The horizontal surface of the second L-shaped mating part is defined as the second mating surface. When the lower mold and the upper mold are closed, the fourth mating surface contacts the lower mold first. After the lower mold and the upper mold are closed, the first mating surface and the second mating surface are tightly fitted, and the third mating surface and the fourth mating surface are tightly fitted, so as to form a closed cavity that matches the contour of the hinged ear plate wax model.

3. The hinged ear plate wax mold forming die according to claim 2, characterized in that: The wax mold forming cavity includes a first cavity for forming the plate and a second cavity integrally formed with the first cavity for forming the connecting ear seat. The first cavity includes a first cavity groove recessed from the first mating surface away from the upper mold and a second cavity groove recessed from the second mating surface away from the lower mold. After the mold is closed, the first cavity groove and the second cavity groove mate to form the plate. The second cavity includes a third cavity recessed from the middle of the first cavity groove toward the direction away from the upper mold, and a fourth cavity recessed from the fourth mating surface toward the direction away from the lower mold. One end of the third cavity groove is disposed near the edge of the first cavity groove, and its other opposite end extends along the direction close to the first L-shaped mating part, and finally extends to the third mating surface of the lower mold. After the mold is closed, the third cavity groove and the fourth cavity groove mate to form the connecting ear seat.

4. The hinged ear plate wax mold forming die according to claim 3, characterized in that: The first cavity is provided with several through holes that vertically penetrate the lower mold. The several through holes are arranged at intervals on both sides of the third cavity. The second cavity is provided with several abutment grooves that correspond to the positions of the through holes. When the mold is closed, one end of several first molding cores can pass through the through holes and abut against the abutment groove to form the fixing hole.

5. The hinged ear plate wax mold forming die according to claim 4, characterized in that: The first molding core includes a first circular core that is connected to the through hole and a second circular core that is coaxially fixed to one end of the first circular core near the upper mold. The outer diameter of the second circular core is smaller than the outer diameter of the first circular core. When the hinged ear wax mold is formed, the stepped diameter difference between the first circular core and the second circular core can form a hole structure with a stepped inner diameter at the corresponding position of the hinged ear wax mold.

6. The hinged ear plate wax mold forming die according to claim 3, characterized in that: The second cavity has a through cavity that vertically penetrates the upper mold. A second molding core is connected to the through cavity. Two symmetrically arranged protruding components are fixed to the edge of the through cavity, and an elongated protrusion is fixed between the two protruding components. Each protruding component consists of two integrally formed protrusions connected end to end. A transverse groove is formed at the junction of the two protrusions. A longitudinal groove is formed on the surface of the elongated protrusion. When the second molding core is installed into the through cavity along a preset assembly direction, the two symmetrical protruding components and the elongated protrusion together form an enclosing structure that surrounds the second molding core. The enclosing structure can form an enclosing cavity on the bottom surface of the plate.

7. The hinged ear plate wax mold forming die according to claim 6, characterized in that: The second molding core includes a core body connected to the through cavity, and two protrusion assemblies fixed to the core body and protruding towards the lower mold. The two protrusion assemblies are spaced apart, and each protrusion assembly is composed of a first variable cross-section protrusion and a second variable cross-section protrusion arranged at intervals. A first groove is provided between the two protrusion assemblies. The first groove can be connected with the longitudinal groove to form longitudinal ribs distributed on the bottom surface of the plate. A second groove perpendicular to the first groove is provided between the first variable cross-section protrusion and the second variable cross-section protrusion. The second groove can be connected with the transverse groove to form transverse ribs distributed on the bottom surface of the plate. After the transverse ribs and the longitudinal ribs are formed, they are fixed in the enclosing cavity. The protrusion assemblies can be correspondingly formed into concave cavities with matching contours in the enclosing cavity.

8. The hinged ear plate wax mold forming die according to claim 3, characterized in that: The third cavity includes an inclined groove and a semi-circular arc groove fixed to one side of the inclined groove. The inclined groove also has a recessed pit that is recessed away from the upper mold. The recess is used to form protrusions distributed on the inclined surface of the connecting ear seat. The semi-circular arc groove can cooperate with the fourth cavity to assemble the molding core assembly, thereby forming the shaft hole.

9. The hinged ear plate wax mold forming die according to claim 8, characterized in that: The fourth type of cavity is provided with a first protrusion, which can form a recessed portion distributed on the bottom surface of the connecting ear seat.

10. The wax mold forming die for the hinged ear plate according to any one of claims 1-9, characterized in that: After the lower mold and the upper mold are closed, they can be assembled to form two spaced wax mold forming cavities. The forming core assembly includes a third forming core disposed between the two wax mold forming cavities, and two fourth forming cores symmetrically arranged on both sides of the third forming core. Each side of the third forming core has a slot that can mate with the fourth forming core. The fourth forming core includes a third circular core and a fourth circular core fixed to one side of the third circular core. The outer diameter of the fourth circular core is smaller than the outer diameter of the third circular core, and the end of the fourth circular core away from the third circular core is fitted into the slot. In the closed state, part of the third forming core, part of the third circular core, and the fourth circular core extend into the wax mold forming cavity, and the structural shape of each extended part is adapted to the stepped shaft hole design on both sides of the connecting ear seat, thereby forming stepped shaft holes distributed on both sides of the connecting ear seat.

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