A wax mold forming mold for a deep hole support and a method of manufacturing the same

Abstract

This invention relates to the field of casting technology, and more particularly to a wax pattern forming mold for a deep-hole support and its preparation method. The forming mold includes a first mold with a first cavity; a second mold with a second cavity; a third mold with a third cavity; a forming module, which includes a side module and a middle module; and a fourth mold with a fourth cavity. After mold closing, the grooves of the fourth mold and the middle module form a first groove. Along the axial direction of the deep-hole cavity of the forming mold, the second mold, the third mold, and the fourth mold are sequentially arranged above the first mold. This invention, by dividing the deep-hole structure of the support into axial segments formed by different mold units, and combining a detachable forming module with an internal movable block design, allows complex geometric features such as deep holes, reinforcing ribs, and weight-reducing grooves to be completely formed in a single wax injection process, avoiding misalignment and seam defects caused by traditional split-assembly processes.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and in particular to a wax pattern forming mold for a deep hole support and its preparation method. Background Technology

[0002] Automotive brackets, as commonly used load-bearing connectors in automobiles, are widely used in automotive assembly structures for fixing and connecting components. One type of automotive bracket (such as...) Figure 1 As shown, the main body is provided with a deep connecting hole, and an L-shaped connecting plate is integrally formed on the outside of the deep connecting hole. The L-shaped connecting plate is provided with several weight-reducing holes, and several reinforcing ribs are provided between the connecting plate and the outer wall of the deep connecting hole. The connection strength between the connecting plate and the deep hole cylinder is improved by the reinforcing ribs. The overall structure is compact and has good load-bearing performance.

[0003] Currently, these types of automotive brackets are generally manufactured using investment casting, with the wax model serving as the pre-cast blank. The molding accuracy and ease of demolding of the wax model are core indicators determining product quality. In existing technologies, Figure 1 The bracket structure shown typically uses a split mold to separately form the L-shaped connecting plate and the deep hole, which are then combined into a single wax model. However, this method has two drawbacks: firstly, the resulting casting has an unattractive appearance; secondly, the wax model assembly process is cumbersome, and misalignment, gaps, and dimensional errors are prone to occur at the assembly points, making it difficult to meet the production requirements of high-precision brackets. Furthermore, the split mold requires highly skilled operators during mold assembly and disassembly, resulting in low production efficiency, rapid mold wear, and high maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a wax mold for deep-hole brackets and its preparation method. The wax mold has a reasonable structural design, which can form the wax mold of the bracket in one step, ensuring the overall forming accuracy of the deep-hole bracket wax mold, facilitating demolding, effectively avoiding deformation of the deep holes and reinforcing ribs of the bracket during the demolding process, and ensuring the quality of the wax mold.

[0005] The technical solution adopted by this invention to solve its technical problem is: a wax mold forming mold for a deep hole support, comprising...

[0006] The first mold is provided with a first cavity for forming the inner structure of the L-shaped connecting plate;

[0007] The second mold is provided with a second cavity for forming the outer structure of the L-shaped connecting plate and the structure at one end of the deep hole;

[0008] The third mold is provided with a third cavity for forming the local structure in the middle of the deep hole;

[0009] A molding module is located between the first mold and the third mold. After being closed with the third mold, it forms a central cavity for molding the central structure of the deep hole. The molding module includes a side module for molding the outer side of the two deep holes and a central module for molding the structure between the two deep holes.

[0010] The fourth mold is provided with a fourth cavity for forming the structure at the other end of the deep hole. After the mold is closed, the groove of the fourth mold and the middle module form the first groove. That is, both the middle module and the fourth mold are provided with partial grooves. After the fourth mold and the middle module are closed, the partial grooves form the first groove. The first groove is fitted with a second module for forming a first weight-reducing groove for a connecting plate. The first mold is provided with a second groove. The other side of the second module is fitted with the second groove.

[0011] After the mold is closed, the second mold, the third mold, and the fourth mold are sequentially positioned above the first mold along the axial direction of the deep hole cavity of the forming mold.

[0012] Furthermore, the first mold is provided with a slide rail, and the second mold, the side module and the fourth mold are slidably connected to the first mold through the slide rail.

[0013] Furthermore, a fourth groove is provided inside the first mold. The fourth groove is located on both sides of the second groove. A riser module for forming a riser is engaged in the fourth groove. The riser module includes a first riser module and a second riser module. After the first riser module and the second riser module are closed, a riser cavity is formed. The cross-section of the riser cavity gradually increases along the depth direction of the riser cavity.

[0014] Furthermore, along the direction perpendicular to the axis of the deep hole cavity, the two ends of the third mold and the fourth mold are inclined surfaces. Preferably, the inclination angle of the inclined surfaces is consistent with the inclination angle of the first reinforcing rib of the bracket. This facilitates the formation of the first reinforcing rib structure of the bracket and the demolding of the fourth mold and the third mold. It also makes the contact surfaces of the third mold and the fourth mold a non-planar structure that fits together. When the fourth mold closes with the first mold via the slide rail, the irregular parting surface at the end of the fourth mold can cooperate with the third mold and the two side modules, ensuring the mold closing accuracy of the third mold. At the same time, when the mold is closed, the groove of the fourth mold engages with the second module, which can adjust the position of the second module and the middle module, thereby ensuring the mold closing accuracy of the middle module and the accuracy of the bracket formation.

[0015] Furthermore, after the mold is closed, one side of the second module abuts against the riser module and the first mold. The side of the second module that abuts against the first mold is a plane. This is to facilitate the adjustment of the position of the second module and the middle module when the fourth mold and the second module are engaged.

[0016] Furthermore, the parting surfaces of the first mold and the second mold are L-shaped. The first mold is fitted with a third module, which is used to form the recessed stop of the L-shaped connecting plate and the second weight-reducing groove of the connecting plate. After the mold is closed, the second mold and the third module abut against each other. Under the action of the second mold with the L-shaped parting surface, the third module is precisely fitted into the first mold.

[0017] Furthermore, the cavity depth of the third cavity is not greater than the deep hole radius of the formed wax mold, which facilitates the demolding of the third mold.

[0018] Furthermore, the first mold and / or the second mold and / or the third mold and / or the fourth mold are provided with wax injection ports.

[0019] Furthermore, the second and third molds are symmetrically provided with positioning grooves, the axial direction of which is consistent with the axis of the deep hole cavity, for placing and positioning the core block used to form the inner hole of the deep hole.

[0020] On the other hand, a method for preparing a wax model of a deep-hole scaffold includes the following steps:

[0021] 1) Connect the inner movable block of the mold and the second module card into the first mold;

[0022] 2) The second mold, the molding module, the third mold and the first mold are joined together, wherein the middle module of the molding module is engaged with the second module;

[0023] 3) The fourth mold is closed with the first mold. During the mold closing process, the fourth mold engages with the second module and abuts with the third mold. During the engagement process, the fourth mold adjusts the closing positions of the second module, the molding module and the third mold.

[0024] 4) After the mold is closed, inject wax through the wax injection port.

[0025] Furthermore, the inner live block includes a riser module and a third module.

[0026] The beneficial effects of this invention are:

[0027] 1. In this invention, the second mold, the fourth mold, and the side module are connected to the first mold by a sliding rail guide. The sliding rail constrains the movement of each mold and module, effectively improving the positioning accuracy and repeatability during the mold closing process. Simultaneously, by dividing the deep hole structure into axial segments formed by different mold units, and combining this with a detachable forming module and internal movable block design, complex geometric features such as deep holes, reinforcing ribs, and weight-reducing grooves can be completely formed in a single wax injection process, avoiding misalignment and seam defects caused by traditional split-assembly processes.

[0028] 2. In the mold-closing process of this invention, the fourth mold can fine-tune and correct the third mold, the second module, and the middle module, allowing them to automatically align to the correct position at the end of the mold-closing process. Specifically, in this invention, one side of the second module engages with the first mold, and the other side engages with the second groove formed by the middle module and the fourth mold. During mold-closing, the middle module first engages with the second module, and then, under the action of the fourth mold, on the one hand, the engagement of the fourth mold with the second module helps to fine-tune the molding module, especially the mold-closing accuracy of the middle module; on the other hand, at the non-planar contact surface or parting surface between the fourth mold and the third mold, the third mold can be fine-tuned to ensure the mold-closing accuracy of the third mold. This invention simplifies the mold-closing and demolding operations, ensures the overall mold-closing accuracy of the mold, guarantees the accuracy and quality of the one-time molding of the support wax model, and effectively avoids the problems of misalignment and gaps that easily occur during the assembly process of traditional split molds, which affect the quality of the wax model. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the bracket of the present invention.

[0030] Figure 2 This is a schematic diagram of the structure of the present invention.

[0031] Figure 3 This is a schematic diagram of the structure of the first mold of the present invention.

[0032] Figure 4 This is a schematic diagram of the structure of the present invention after the fourth mold is removed.

[0033] Figure 5 yes Figure 4 A cross-sectional view along the AA direction.

[0034] Figure 6 This is a schematic diagram of the structure of the second module, the middle module and the fourth mold of the present invention.

[0035] Figure 7 This is a schematic diagram of the structure of the middle module and the fourth mold in this invention.

[0036] Explanation of reference numerals in the attached figures: 10 – First mold, 11 – Second module, 12 – Riser module, 13 – Third module, 14 – Slide rail, 20 – Second mold, 30 – Third mold, 40 – Molding module, 41 – Side module, 42 – Middle module, 50 – Fourth mold. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0038] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for 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. Therefore, they should not be construed as limitations on the present 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.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 connection 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.

[0040] like Figure 2-7 As shown, this embodiment of a wax mold forming die for a deep hole support includes...

[0041] The first mold 10 has a first cavity for forming the inner structure of the L-shaped connecting plate; the upper surface of the first mold 10 is stepped.

[0042] The second mold 20 is provided with a second cavity for forming the outer structure of the L-shaped connecting plate and the structure at one end of the deep hole; the second mold 20 is an L-shaped structure that mates with the stepped side of the first mold 10.

[0043] The third mold 30 is provided with a third cavity for forming a local structure in the middle of a deep hole;

[0044] The molding module 40 is located between the first mold 10 and the third mold 30. After being closed with the third mold 30, it forms a central cavity for molding the central structure of the deep hole. The molding module 40 includes a side module 41 for molding the outer side of the two deep holes and a central module 42 for molding the structure between the two deep holes.

[0045] The fourth mold 50 is provided with a fourth cavity for forming the structure at the other end of the deep hole. After the mold is closed, the groove of the fourth mold 50 and the middle module 42 form a first groove. That is, both the middle module 42 and the fourth mold 50 are provided with partial grooves. After the fourth mold 50 and the middle module 42 are closed, the groove of the fourth mold 50 and the middle module 42 form a first groove. A second module 11 for forming a first weight-reducing groove of the connecting plate is engaged in the first groove. The first mold 10 is provided with a second groove. The other side of the second module 11 is engaged with the second groove.

[0046] After the mold is closed, along the axial direction of the deep hole cavity of the forming mold, the second mold 20, the third mold 30 and the fourth mold 50 are sequentially arranged above the first mold 10.

[0047] The wax mold forming mold of the deep hole bracket of the present invention effectively ensures the integrity of the forming mold in the final mold closing stage through the snap-fit ​​relationship of the fourth mold 50, the second module 11 and the middle module 42. When the fourth mold 50 closes along the slide rail 14 towards the first mold 10, the fourth mold 50 snaps into the second module 11, and the groove of the middle module 42 gradually aligns with the groove of the fourth mold 50. This allows the position of the second module 11 to be precisely finely adjusted and corrected during the snap-fit ​​process. Since the second module 11 and the middle module 42 snap into each other, the position of the middle module 42 is simultaneously finely adjusted and corrected along with the second module 11, thereby adjusting the final position of the entire forming module 40 and the third mold 30 that it mates with, ensuring the alignment accuracy between the segmented cavities (first cavity, second cavity, third cavity, middle cavity, and fourth cavity).

[0048] The first mold 10 is equipped with a slide rail 14. The second mold 20, side module 41, and fourth mold 50 are slidably connected to the first mold 10 via the slide rail 14. The second mold 20, side module 41, and fourth mold 50 are respectively provided with matching grooves. The slide rail 14 can be a linear guide rail, a T-slot, or other structural forms. The slide rail 14 structure can ensure that the second mold 20, side module 41, and fourth mold 50 move smoothly along a predetermined trajectory during mold closing and demolding, effectively avoiding damage to the wax model due to offset or jamming. At the same time, the slide rail 14 has a guiding function between corresponding mold components, further ensuring the mold closing or centering accuracy of each segment cavity.

[0049] The first mold 10 has a fourth groove inside, located on both sides of the second groove. A riser module 12 for forming a riser is engaged within the fourth groove. The riser module 12 includes a first riser module and a second riser module. After the first and second riser modules are closed, a riser cavity is formed. Along the depth direction of the riser cavity, the cross-section of the riser cavity gradually increases. This riser cavity communicates with an L-shaped connecting plate, and one end of the riser cavity with a smaller cross-section connects to the cavity of the L-shaped connecting plate. During the wax pattern forming process, the riser can utilize its gradually changing cross-section geometry to form a gate channel that decreases in size. During the casting process, this facilitates ensuring the quality of the cast blank after casting and avoids casting defects such as shrinkage porosity and shrinkage cavities.

[0050] Along a direction perpendicular to the axis of the deep-hole cavity, the two ends and side modules 41 of the third mold 30 and the fourth mold 50 are inclined surfaces. That is, the contours of the third mold 30, the fourth mold 50, and the molding module 40 are designed as inclined planes or curved surfaces. Thus, during mold closing, the inclined surfaces of the third mold 30, the fourth mold 50, and the corresponding end faces of the side modules 41 form non-planar contact surfaces. This design serves two purposes: firstly, the inclined surface itself can be directly used as the parting surface of the first reinforcing rib of the molding bracket, thereby forming an inclined reinforcing rib structure on the wax model. Preferably, the inclination angle of the inclined surface is consistent with the inclination angle of the reinforcing rib structure of the bracket. Secondly, these mutually cooperating inclined surfaces guide the mold closing action. When the fourth mold 50 slides and closes via the slide rail 14, its inclined surface first contacts the inclined surface of the third mold 30 and the end face of the side module 41. Through the sliding contact between the inclined surfaces, the movement of the fourth mold 50 can generate a small component force, which pushes the third mold 30 and the side module 41 to make fine adjustments, so that the relative positions of the third mold 30, the molding module 40, the fourth mold 50, and the first mold 10 are more precisely matched.

[0051] After the mold is closed, one side of the second module 11 abuts against the riser module 12 and the first mold 10. This side of the second module 11 is a plane, that is, the side of the second module 11 facing the riser module 12 and the first mold 10 is a flat plane. When the fourth mold 50 pushes the second module 11 by snapping, this plane of the second module 11 is in close contact with the top of the riser module 12 and the top of the first mold 10. This can prevent the second module 11 from tilting or rotating when it is pushed, and ensure that the adjustment force applied by the fourth mold 50 can be effectively transmitted in the predetermined direction. This allows for more precise adjustment of the position of the second module 11 itself and the middle module 42 that it snaps into, ensuring the stability of the adjustment process and the accuracy of the final positioning.

[0052] The first mold 10 and the second mold 20 have L-shaped parting surfaces. The first mold 10 is fitted with a third module 13, which forms the recessed stop of the L-shaped connecting plate and the second weight-reducing groove of the connecting plate. After the molds are closed, the second mold 20 abuts against the third module 13. Under the action of the L-shaped parting surface of the second mold 20, the third module 13 is precisely fitted into the first mold 10. The third module 13, as an internal movable block, is pre-placed in a specific slot within the first mold 10. The second mold 20 has an L-shaped structure that matches the first mold 10. When the second mold 20 moves along the mold closing direction (slide rail direction) and closes with the first mold 10, the inner wall surfaces (especially the vertical and horizontal surfaces) of its L-shaped structure will simultaneously and evenly press against the corresponding outer surfaces of the third module 13. This allows the third module 13 to overcome the small gaps or friction between itself and the slot of the first mold 10 and to be tightly engaged in the predetermined position of the first mold 10, thereby ensuring the positional accuracy of the recessed stop and the second weight reduction groove formed by the third module 13 on the wax model.

[0053] The cavity depth of the third cavity is no greater than the radius of the deep hole in the formed wax model. The third mold 30 is only used to form a small section of the arc-shaped or cylindrical outer wall in the middle of the deep hole structure. Due to its shallow cavity depth, the demolding stroke required for the third mold 30 during mold opening is very short, which greatly reduces the risk of deformation or damage to the deep hole part of the wax model caused by forcibly demolding the third mold 30, simplifies the demolding operation, and helps to protect the integrity of the wax model.

[0054] The first mold 10 and / or the second mold 20 and / or the third mold 30 and / or the fourth mold 50 are provided with wax injection ports for injecting molten wax into the complete cavity formed by the molds after the molds are closed.

[0055] The second mold 20 and the third mold 30 are symmetrically provided with positioning grooves, the axis of which is aligned with the axis of the deep hole cavity. These grooves are used to place and position the core block used to form the inner hole of the deep hole. Positioning grooves are also provided on the end faces of the second mold 20 and the third mold 30 facing each other. These grooves are used to place and clamp the cylindrical core rod (core block) used to form the inner hole of the deep hole. Because the axis of the positioning groove is designed to be aligned with the axis of the deep hole cavity and is constrained by both molds, the positioning accuracy of the core rod within the mold is ensured, thereby guaranteeing the uniformity of the wall thickness of the inner wall of the deep hole in the final wax mold.

[0056] On the other hand, a method for preparing a wax model of a deep-hole scaffold includes the following steps:

[0057] 1) Connect the inner movable block of the forming mold and the second module 11 into the first mold 10, that is, connect the riser module 12, the third module 13 and the second module 11 into the corresponding positions inside the first mold 10;

[0058] 2) The second mold 20, molding module 40, and third mold 30 are closed with the first mold 10. Specifically, the middle module 42 of the molding module 40 is engaged with the second module 11. The second mold 20 is slidably connected to the first mold 10 via a slide rail 14 during the closing process. During closing, the second mold 20 tightly engages the third module 13 within the first mold 10, ensuring the closing accuracy of the third module 13. The side module 41 of the molding module 40 is slidably connected to the first mold 10 via the slide rail 14, and the middle module 42 engages with the second module 11. The third mold 30 is placed above the molding module 40 to achieve mold closing. The closing sequence of the second mold 20 and the molding module 40 is not fixed.

[0059] 3) The fourth mold 50 is closed with the first mold 10 via the slide rail 14. During the mold closing process, the fourth mold 50 engages with the second module 11. During this engagement, the fourth mold 50 performs fine-tuning and correction on the second module 11 and simultaneously performs fine-tuning and correction on the middle module 42 that engages with the second module 11 to ensure the mold closing accuracy of the second module 11 and the middle module 42. At the same time, the fourth mold 50 cooperates with the third mold 30, using the non-planar contact surface or parting surface between the fourth mold 50 and the third mold 30 to adjust and ensure the mold closing accuracy of the third mold 30.

[0060] 4) After the mold is closed, inject wax through the wax injection port.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A wax mold forming die for a deep hole support, characterized in that: include The first mold is provided with a first cavity for forming the inner structure of the L-shaped connecting plate; The second mold is provided with a second cavity for forming the outer structure of the L-shaped connecting plate and the structure at one end of the deep hole; The third mold is provided with a third cavity for forming the local structure in the middle of the deep hole; A molding module is located between the first mold and the third mold. After being closed with the third mold, it forms a central cavity for molding the central structure of the deep hole. The molding module includes a side module for molding the outer side of the two deep holes and a central module for molding the structure between the two deep holes. The fourth mold is provided with a fourth cavity for forming the structure at the other end of the deep hole. After the mold is closed, the groove of the fourth mold and the middle module form a first groove. A second module for forming a first weight-reducing groove for a connecting plate is engaged in the first groove. The first mold is provided with a second groove, and the other side of the second module is engaged with the second groove. The first mold has a fourth groove inside, which is located on both sides of the second groove. A riser module for forming risers is engaged in the fourth groove. After the mold is closed, the second mold, the third mold, and the fourth mold are sequentially positioned above the first mold along the axial direction of the deep hole cavity of the forming mold.

2. The wax mold forming die for a deep hole support according to claim 1, characterized in that: The first mold is provided with a slide rail, and the second mold, the side module and the fourth mold are slidably connected to the first mold through the slide rail.

3. The wax mold forming die for a deep hole support according to claim 1, characterized in that: The riser module includes a first riser module and a second riser module. After the first riser module and the second riser module are molded together, a riser cavity is formed. The cross-section of the riser cavity gradually increases along the depth direction of the riser cavity.

4. The wax mold forming die for a deep hole support according to claim 1, characterized in that: Along the direction perpendicular to the axis of the deep hole cavity, the two ends of the third mold and the fourth mold are inclined surfaces.

5. The wax mold forming die for a deep hole support according to claim 3, characterized in that: After the mold is closed, one side of the second module abuts against the riser module and the first mold, and the side of the second module that abuts against the first mold is a plane.

6. The wax mold forming die for a deep hole support according to claim 1, characterized in that: The parting surface of the first mold and the second mold is L-shaped. The first mold is fitted with a third module, which is used to form the recessed stop of the L-shaped connecting plate and the second weight-reducing groove of the connecting plate. After the mold is closed, the second mold and the third module abut against each other.

7. The wax mold forming die for a deep hole support according to claim 1, characterized in that: The cavity depth of the third cavity is not greater than the radius of the deep hole in the formed wax model.

8. The wax mold forming die for a deep hole support according to claim 1, characterized in that: The second and third molds are symmetrically provided with positioning grooves, and the axial direction of the positioning grooves is consistent with the axis of the deep hole cavity.

9. A method for preparing a wax model of a deep-hole support, comprising using a wax model forming mold for a deep-hole support as described in any one of claims 1-8, characterized in that: Includes the following steps: 1) Connect the inner movable block and the second module of the mold into the first mold; the inner movable block includes a riser module and a third module; 2) The second mold, the molding module, the third mold and the first mold are joined together, wherein the middle module of the molding module is engaged with the second module; 3) The fourth mold is closed with the first mold. During the mold closing process, the fourth mold engages with the second module and abuts with the third mold. During the engagement process, the fourth mold adjusts the closing positions of the second module, the molding module and the third mold. 4) After the mold is closed, inject wax through the wax injection port.

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