Modularized cold core mold structure
By using a modular cold core mold structure, the cold core mold is divided into a core and a template, which solves the problems of material waste and long production cycle of traditional cold core molds, and achieves reduced material costs and improved production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG LONGJI MACHINERY
- Filing Date
- 2025-05-14
- Publication Date
- 2026-04-28
AI Technical Summary
Traditional cold core molds result in significant material waste, long production cycles, and high costs in brake disc casting. This is mainly due to the waste of high-quality materials in non-functional parts caused by the integral structure and the extended production cycle caused by bracket welding.
The design adopts a modular approach, dividing the upper and lower molds into detachable functional parts (mold cores) and non-functional parts (templates). The mold cores are made of high-quality materials such as H13 steel, while the templates are made of ordinary materials such as 45 steel. The detachable connection and positioning structure enables quick replacement and reuse.
It significantly improved material utilization, reduced costs, shortened production cycles, and enhanced the versatility of molds and the flexibility of production lines.
Smart Images
Figure CN224168683U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold manufacturing technology, and in particular to a modular cold core mold structure. Background Technology
[0002] In the field of brake disc casting, cold core molds, as key molds for manufacturing sand cores, directly affect the production quality and efficiency of brake discs due to their performance and cost. Traditional cold core molds for brake discs, such as... Figure 1-2 As shown, its basic structure includes an upper mold 100 and a lower mold 200. The upper and lower molds fit together precisely to shape the sand core to meet the requirements of brake disc casting. In terms of material selection, H13 steel is commonly used for brake disc casting cold core molds due to its excellent high-temperature strength, thermal fatigue performance, and resistance to thermal cracking. However, the price of H13 steel is more than twice that of common 45 steel, making the manufacturing cost of the cold core mold relatively high.
[0003] In traditional cold core molds, the functional parts are concentrated in the circular recessed areas in the middle of the upper mold 100 and lower mold 200. This area directly participates in core forming and has extremely high requirements for material properties. However, the non-functional parts, which are integrated with the functional areas around the cold core mold, occupy a large proportion. In actual use, the material properties required for non-functional parts are far lower than those for functional parts. However, due to the integral structural design, the mold must be manufactured using the same high-quality materials as the functional parts. This undoubtedly leads to the overuse of high-quality mold materials in the peripheral structure, wasting a large amount of valuable mold material resources and significantly increasing the production cost of the mold.
[0004] Meanwhile, each traditional cold core mold has a support bracket 300 welded to its lower mold 200, which not only causes a lot of waste of mold material, but also prolongs the production cycle. Utility Model Content
[0005] This utility model aims to solve the problems of serious material waste, long production cycle, and / or high cost in the existing cold core mold processing. It achieves mold structure optimization through a modular, split design, and the specific technical solution is as follows:
[0006] A modular cold core mold structure includes an upper mold and a lower mold. Unlike existing technologies, the upper mold includes a detachably connected upper mold core and an upper template, and the lower mold includes a detachably connected lower mold core and a lower template. The upper mold core and lower mold core are functional parts used to form a sand core. The upper template and lower template are reusable non-functional parts used for support and positioning.
[0007] Furthermore, the upper mold core and the lower mold core are configured with different shaped molding cavities according to different sand core models, but the outer contours of both are circular and the outer diameters of all models are the same; the lower end face of the upper mold template is provided with an upper circular groove, and the upper end face of the lower mold template is provided with a lower circular groove. The inner diameters of the upper circular groove and the lower circular groove are larger than the outer diameters of the upper mold core and the lower mold core, respectively, and the groove depths are smaller than the thicknesses of the upper mold core and the lower mold core, respectively.
[0008] Furthermore, the bottom walls of the upper and lower circular grooves contact the top surface of the upper mold core and the bottom surface of the lower mold core, respectively, forming axial support and restricting the displacement of the mold core in the vertical direction; the upper mold core and the upper template and the lower mold core and the lower mold core are radially positioned by locating pin sleeves; four radial screw holes are evenly opened at 90° intervals along the circumferential sidewalls of the upper and lower circular grooves, and the axis of the radial screw holes extends and penetrates the upper and lower circular grooves radially; a locking screw is screwed into each radial screw hole, and the end of the locking screw abuts and locks against the outer circular surface of the upper or lower mold core.
[0009] Furthermore, the inner diameter of the upper circular groove is greater than the inner diameter of the upper mold core, and the groove depth is less than the thickness of the upper mold core; the inner diameter of the lower circular groove is greater than the outer diameter of the lower mold core, and the groove depth is less than the thickness of the lower mold core.
[0010] Furthermore, a sand-passing hole corresponding to the sand-shooting nozzle on the upper mold core is opened in the middle of the bottom wall of the upper circular groove; a rod-passing hole for multiple ejector rods on the ejector plate is opened in the middle of the bottom wall of the lower circular groove.
[0011] Furthermore, the ejector plate is integrated with the lower mold core by screws.
[0012] Furthermore, two radially symmetrical positioning pins are fixed on the upper end face of the lower template, and two positioning holes are opened on the end face of the upper template corresponding to the two positioning pins.
[0013] Furthermore, the lower end face of the lower template is fixedly connected to a bracket, the bracket including a base plate and multiple support rods, the two ends of the support rods being screwed or welded to the base plate and the lower template respectively.
[0014] Furthermore, a weight-reducing hole is formed in the center of the base plate.
[0015] Furthermore, the lower surface of the base plate extends downward to form a convex ring.
[0016] Furthermore, the upper end of the support rod is tapered and extends out of the lower template to form a positioning pin, and a positioning hole is opened on the end face of the upper template corresponding to the positioning pin.
[0017] Compared with the prior art, the present invention has the following beneficial technical effects:
[0018] Material utilization is significantly improved: high-quality materials can be used for functional parts (mold core), while ordinary materials can be used for non-functional parts (upper / lower templates, supports), avoiding the waste of high-quality materials in non-functional areas in traditional integrated designs, and greatly reducing material costs.
[0019] Production cycle is greatly shortened: The template and support are of a universal structure, which can be reused after only one processing, saving the time of processing the support for each mold separately in the traditional process and shortening the mold production cycle.
[0020] Enhanced mold versatility and flexibility: Different mold cores are matched with the template through a unified outer diameter and connection interface. By changing the mold core, different sand cores can be produced without replacing the entire mold, which significantly improves the flexibility of the production line. Attached Figure Description
[0021] Figure 1 and Figure 2 This is a schematic diagram of the existing upper and lower molds from different perspectives.
[0022] Figure 3 This is a schematic diagram of the structure of this utility model.
[0023] Figure 4 and Figure 5 These are component separation diagrams from different perspectives of this utility model. Detailed Implementation
[0024] like Figure 3-5 The modular cold core mold structure shown includes an upper mold 100 and a lower mold 200. The upper mold 100 includes an upper mold core 110 and an upper template 120 that are detachably connected. The lower mold 200 includes a lower mold core 210 and a lower template 220 that are detachably connected. The upper mold core 110 and the lower mold core 210 are functional parts used for forming sand cores. The upper template 120 and the lower template 220 are reusable non-functional parts used for support and positioning.
[0025] I. Core Principles (Modular and Split Design)
[0026] 1. Separation of functional and non-functional parts
[0027] Functional part (mold core): The upper mold core 110 and the lower mold core 210 are the core components that directly participate in the sand core molding. They are made of high-quality mold materials such as H13 steel and are designed with specific cavity shapes according to different sand core models to ensure the accuracy of the sand core and the service life of the mold.
[0028] Non-functional section (templates): The upper template 120 and lower template 220 are only used to support and position the mold core, and are made of ordinary steel (such as 45 steel). The templates do not participate in the sand core molding, have low requirements for material performance, and can be reused for different types of mold cores, avoiding the waste of high-quality materials in non-functional areas in traditional one-piece molds.
[0029] 2. Detachable connection and universal design
[0030] The upper mold core 110 and the upper template 120, and the lower mold core 210 and the lower template 220 are all connected by detachable means (such as bolt connection, pin positioning and other common methods, the specific structure is detailed in the sub-rights), so that the mold core can be replaced independently while the template remains unchanged.
[0031] As a universal component, the template's structural design is not dependent on specific sand core models. It only needs to be processed once to adapt to various mold cores, achieving "one mold frame for multiple uses".
[0032] II. Specific Implementation Process
[0033] 1. Mold assembly
[0034] Mold core installation: The upper mold core 110 and the upper template 120 are fixedly connected by a detachable method (such as bolts, positioning pins and other specific connection structures described later) to ensure the positional accuracy of the mold core on the template; similarly, the lower mold core 210 and the lower template 220 are installed.
[0035] Mold closing preparation: Align the upper mold 100 and lower mold 200 with the mold core installed, and achieve precise mold closing of the upper and lower molds through the positioning structure on the template (such as the positioning pins and positioning holes described later).
[0036] 2. Sand core forming
[0037] Sand injection filling: After the cold core mold is closed, it is installed on the cold core machine. The sand material is injected into the cavity through the sand injection port of the upper mold core 110. Under pressure, it fills the forming area of the mold core to form the desired shape of the sand core.
[0038] Curing and demolding: After the sand material has cured, open the upper mold 100 and eject the sand core through the ejection structure of the lower mold core 210 (such as the ejection rod through hole described later) to complete the one-time molding process.
[0039] 3. Mold replacement and reuse
[0040] When different types of sand cores need to be produced, only the upper mold core 110 and the lower mold core 210 need to be disassembled and replaced with new mold cores of the corresponding type (there is no need to replace the upper template 120 and the lower template 220).
[0041] Templates and supports (described later) are universal components that can be reused for a long time without reprocessing, significantly reducing mold processing time and material consumption.
[0042] III. Technological Advantages
[0043] Reduced material costs: High-quality materials are used only in the mold core, while ordinary materials are used in the template. This avoids the waste of high-quality materials in non-functional parts of traditional molds, and material costs can be reduced by more than 30%.
[0044] Shorter production cycle: The template and support are universal structures, eliminating the need for individual processing for each mold. This saves time spent repeatedly manufacturing non-functional parts in traditional processes, and the mold production cycle can be shortened by more than 40%.
[0045] Enhanced production flexibility: Sand core models can be quickly switched by changing the mold core, without the need to replace the entire mold, adapting to the needs of multi-variety, small-batch production and improving the flexibility of the production line.
[0046] The core of this embodiment is to separate the functional core (mold core) of the mold from the supporting structure (template) through the "mold core-template" split structure, so as to realize the precise use of high-quality materials and the reuse of non-functional parts, thus solving the problems of material waste and long production cycle of traditional molds.
[0047] In another preferred embodiment, the upper mold core 110 and lower mold core 210 are configured with different shaped molding cavities according to different sand core models, but their outer contours are all circular and the outer diameters of all models are consistent. The lower end face of the upper template 120 is provided with an upper circular groove 121, and the upper end face of the lower template 220 is provided with a lower circular groove 221. The inner diameters of the upper circular groove 121 and the lower circular groove 221 are respectively larger than the outer diameters of the upper mold core 110 and the lower mold core 210, and the groove depths are respectively smaller than the thicknesses of the upper mold core 110 and the lower mold core 210. By unifying the outer contours of the upper and lower mold cores to be circular and having the same outer diameter, and using the circular grooves on the templates (with an inner diameter slightly larger than the outer diameter of the mold core and a groove depth slightly smaller than the thickness of the mold core), standardized installation of different models of mold cores is achieved. Only the core molding cavity part of the mold core needs to be replaced, while the template grooves are universal, significantly reducing mold processing costs, while facilitating rapid mold changeovers and improving production flexibility.
[0048] In another preferred embodiment, the bottom walls of the upper circular groove 121 and the lower circular groove 221 are in contact with the top surface of the upper mold core 110 and the bottom surface of the lower mold core 210, respectively, forming axial support and restricting the displacement of the mold core in the vertical direction; the upper mold core 110 and the upper mold plate 120 and the lower mold core 210 and the lower mold core 210 are radially positioned by locating pin sleeves; four radial screw holes 122 are evenly provided at 90° intervals along the circumferential sidewalls of the upper circular groove 121 and the lower circular groove 221, and the axis of the radial screw holes 122 extends radially along the upper circular groove 121 and the lower circular groove 221 and penetrates through them; a locking screw 500 is screwed into each radial screw hole 122, and the end of the locking screw 500 abuts and locks against the outer circular surface of the upper mold core 110 or the lower mold core 210. The axial support formed by the contact between the bottom wall of the groove and the top / bottom surface of the mold core effectively restricts the vertical displacement of the mold core, ensuring the height accuracy of the sand core. Initial radial positioning is achieved with the locating pin sleeve, and the four circumferentially evenly distributed radial screw holes and locking screws allow for fine-tuning and locking of the mold core position, automatically centering it to the groove center. This significantly improves radial positioning accuracy and avoids defects such as uneven wall thickness in the sand core due to mold core misalignment. Simultaneously, the standardized positioning and locking structure supports rapid mold core replacement, and the mold template can be reused, reducing waste of high-quality materials and shortening changeover time. While ensuring the molding accuracy of the sand core, this achieves efficient and low-cost mold production.
[0049] In another preferred embodiment, the inner diameter of the upper circular groove 121 is larger than the inner diameter of the upper mold core 110, and the groove depth is smaller than the thickness of the upper mold core 110; the inner diameter of the lower circular groove 221 is larger than the outer diameter of the lower mold core 210, and the groove depth is smaller than the thickness of the lower mold core 210. By specifying that the inner diameter of the groove is larger than the outer diameter of the mold core and the groove depth is smaller than the thickness of the mold core, an installation gap and axial positioning space are reserved. This ensures that the mold core can be smoothly embedded into the template, and also provides effective support through bottom wall contact, preventing the mold core from loosening or jamming, thus balancing installation convenience and structural stability.
[0050] In another preferred embodiment, a sand passage hole 123 corresponding to the sand injection nozzle 111 on the upper mold core 110 is provided in the middle of the bottom wall of the upper circular groove 121; a rod passage hole 222 for multiple ejector rods 401 on the ejector plate 400 is provided in the middle of the bottom wall of the lower circular groove 221. The sand passage hole on the bottom wall of the upper mold plate groove corresponds to the sand injection nozzle of the mold core, ensuring that the sand is smoothly injected into the cavity during the sand injection process; the rod passage hole on the bottom wall of the lower mold plate groove matches the ejector rod, facilitating the ejection and demolding of the sand core after it has solidified. This design deeply integrates the mold structure with the sand core production process, improving molding efficiency and automation.
[0051] In another preferred embodiment, the ejector disc 400 is integrally connected to the lower mold core 210 by screws. The screw connection ensures precise positioning and stable engagement between the ejector disc and the lower mold core, guaranteeing that the ejector rod 401 and the rod hole 222 of the lower mold plate 220 are always aligned, preventing damage due to uneven force during core ejection caused by ejector disc misalignment. Simultaneously, the detachable screw connection facilitates individual disassembly and maintenance of the ejector disc without disassembling the entire lower mold core, simplifying the maintenance process. The integrated design reduces assembly gaps, improves the synchronization and stability of the ejection action, and is particularly suitable for high-frequency production scenarios, significantly improving core demolding efficiency and finished product qualification rate. Furthermore, in conjunction with the modular structure of the mold core and mold plate, it further enhances the overall reliability and ease of use of the mold.
[0052] In another preferred embodiment, two radially symmetrical locating pins 223 are fixed to the upper end face of the lower template 220, and two locating holes 124 are formed on the end face of the upper template 120 corresponding to the two locating pins 223. The two radially symmetrical locating pins on the upper end face of the lower template cooperate with the locating holes of the upper template to achieve precise alignment when the upper and lower molds are closed, avoiding errors in the size of the sand core due to positional deviations. The symmetrically distributed locating pin structure is simple and reliable, significantly improving the mold closing accuracy and ensuring the quality of sand core forming.
[0053] In another preferred embodiment, a bracket 300 is fixedly connected to the lower end face of the lower template 220. The bracket 300 includes a base plate 310 and multiple support rods 320, with both ends of the support rods 320 screwed or welded to the base plate 310 and the lower template 220, respectively. The lower template is fixed to the cold core machine worktable by a detachable or fixedly connected bracket (including the base plate and support rods). The bracket structure is universal and can be reused for different mold cores. The screwing or welding method between the support rods and the base plate balances installation flexibility and structural strength, avoiding the repetitive processing of brackets in traditional molds and shortening the mold production cycle.
[0054] In another preferred embodiment, a weight-reducing hole 311 is formed in the center of the base plate 310. Its function is not only to reduce the weight of the support, but also to reduce processing deformation caused by material redundancy by optimizing the base plate structure, reducing the contact area between the base plate and the worktable, and improving the levelness and stability of the mold installation.
[0055] In another preferred embodiment, the lower surface of the base plate 310 extends downward to form a convex ring 312. This ring penetrates the sand layer and embeds into the positioning groove of the worktable or directly makes rigid contact with the worktable, forming a mechanical positioning fulcrum and preventing the base plate from being suspended or making poor contact due to sand accumulation. This design ensures the mold's levelness in the sand environment (the bottom surface of the convex ring fits against the worktable plane) and significantly improves installation stability through rigid contact, preventing mold displacement caused by vibration during sand injection.
[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A modular cold core mold structure, comprising an upper mold (100) and a lower mold (200), characterized in that, The upper mold (100) includes a detachably connected upper mold core (110) and an upper template (120), and the lower mold (200) includes a detachably connected lower mold core (210) and a lower template (220); the upper mold core (110) and the lower mold core (210) are functional parts used for forming sand cores; the upper template (120) and the lower template (220) are reusable non-functional parts used for support and positioning.
2. The modular cold core mold structure according to claim 1, characterized in that, The upper mold core (110) and lower mold core (210) are configured with different shaped molding cavities according to different sand core models, but the outer contours of both are circular and the outer diameter of all models is the same; the lower end face of the upper template (120) is provided with an upper circular groove (121), and the upper end face of the lower template (220) is provided with a lower circular groove (221). The inner diameters of the upper circular groove (121) and the lower circular groove (221) are larger than the outer diameters of the upper mold core (110) and the lower mold core (210), respectively, and the groove depths are smaller than the thicknesses of the upper mold core (110) and the lower mold core (210), respectively.
3. A modular cold core mold structure according to claim 2, characterized in that, The bottom walls of the upper circular groove (121) and the lower circular groove (221) are in contact with the top surface of the upper mold core (110) and the bottom surface of the lower mold core (210), respectively, forming axial support and restricting the displacement of the mold core in the vertical direction; the upper mold core (110) and the upper template (120) and the lower mold core (210) and the lower mold core (210) are radially positioned by locating pin sleeves; four radial screw holes (122) are evenly opened at 90° intervals along the circumferential sidewalls of the upper circular groove (121) and the lower circular groove (221), and the axis of the radial screw holes (122) extends and penetrates the upper circular groove (121) and the lower circular groove (221) radially; a locking screw (500) is screwed into each radial screw hole (122), and the end of the locking screw (500) abuts and locks against the outer circular surface of the upper mold core (110) or the lower mold core (210).
4. A modular cold core mold structure according to claim 2, characterized in that, The inner diameter of the upper circular groove (121) is greater than the inner diameter of the upper mold core (110), and the groove depth is less than the thickness of the upper mold core (110); the inner diameter of the lower circular groove (221) is greater than the outer diameter of the lower mold core (210), and the groove depth is less than the thickness of the lower mold core (210).
5. A modular cold core mold structure according to claim 2, characterized in that, The bottom wall of the upper circular groove (121) is provided with a sand passage hole (123) corresponding to the sand injection nozzle (111) on the upper mold core (110); the bottom wall of the lower circular groove (221) is provided with a rod passage hole (222) through which multiple ejector rods (401) on the ejector plate (400) pass.
6. A modular cold core mold structure according to claim 5, characterized in that, The ejector plate (400) is connected to the lower mold core (210) by screws.
7. A modular cold core mold structure according to claim 1, characterized in that, Two radially symmetrical positioning pins (223) are fixed on the upper end face of the lower template (220), and two positioning holes (124) are opened on the end face of the upper template (120) corresponding to the two positioning pins (223).
8. A modular cold core mold structure according to claim 1, characterized in that, The lower end face of the lower template (220) is fixed to a bracket (300). The bracket (300) includes a base plate (310) and multiple support rods (320). The two ends of the support rods (320) are screwed or welded to the base plate (310) and the lower template (220) respectively.
9. A modular cold core mold structure according to claim 8, characterized in that, The base plate (310) has a weight reduction hole (311) in the center.
10. A modular cold core mold structure according to claim 8, characterized in that, The lower surface of the base plate (310) extends downward to form a convex ring (312).