3D printing process for annular water channel of motor shell
By using a new production process and sand core reinforcing agent, the problem of insufficient strength of 3D printed annular waterway sand cores has been solved, resulting in cost reduction and process simplification, and avoiding the use of ceramsite sand and pearl sand.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHANGCHAI
- Filing Date
- 2026-02-12
- Publication Date
- 2026-05-15
AI Technical Summary
The existing 3D printed annular waterway sand cores have insufficient strength, resulting in high production costs and complicated processes. Furthermore, the use of ceramsite sand and abrasive sand causes significant wear and tear on the equipment nozzles.
A new production process and sand core reinforcing agent are adopted. Using materials such as furan resin for casting 3D inkjet printing, curing agent, raw sand, sand core reinforcing agent and refractory aggregate, the strength of the sand core is improved through dip coating and drying process, avoiding the use of ceramsite sand and pearl sand.
It effectively improves the strength of sand cores, reduces production costs, minimizes equipment wear and tear, and simplifies the production process.
Smart Images
Figure CN122033180A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of motor housing casting technology, specifically relating to a 3D printing process for annular water channels in motor housings. Background Technology
[0002] To address the insufficient strength of 3D-printed sand cores in annular water channels, traditional 3D printing methods primarily employ ceramsite or abrasive sand. This approach is costly and involves a complex production process, requiring the complete emptying of the ordinary silica sand from the equipment and the resetting of printing process parameters. Furthermore, the use of ceramsite and abrasive sand causes significant wear and tear on the nozzles of the 3D printing equipment.
[0003] Therefore, there is an urgent need to design a process to address the technical deficiency of insufficient strength in 3D printed sand cores.
[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention
[0005] This disclosure provides at least one embodiment of a 3D printing process for an annular waterway in a motor housing.
[0006] In a first aspect, the present disclosure provides a 3D printing process for an annular waterway in a motor housing, comprising: step 1, designing the 3D printing process for the motor housing; step 2, 3D printing sand cores using printing materials; step 3, allowing the 3D printed sand cores to stand; step 4, impregnating the spiral waterway sand cores with a sand core reinforcing agent; step 5, drying the sand core reinforcing agent; step 6, spraying all sand cores with a coating; step 7, drying the coating; step 8, assembling the sand cores: assembling the sand cores together according to the process design; step 9, casting the part; and step 10, cleaning the casting.
[0007] In one alternative embodiment, the printing material comprises the following components by weight percentage: 0.06% furan resin for casting 3D inkjet printing, 0.26% curing agent, and the remainder being 3D printing raw sand.
[0008] In one alternative embodiment, the furan resin for casting 3D inkjet printing is one or more of furfuryl alcohol and its polymers.
[0009] In one optional embodiment, the curing agent is p-toluenesulfonic acid, dimethylbenzenesulfonic acid, or water.
[0010] In one alternative embodiment, the core reinforcing agent is furfuryl alcohol and ethanol.
[0011] In one alternative embodiment, the coating is a graphite-based refractory aggregate and water.
[0012] In one alternative implementation, the 3D-printed sand core is left to stand for 24 hours.
[0013] In one optional embodiment, the core reinforcing agent is dried by heating a box-type core drying furnace to 150°C, turning it off, and placing the spiral water channel core into the core drying furnace for 5 minutes.
[0014] In one optional embodiment, the coating drying process involves heating a box-type core drying oven to 150°C, turning it off, and placing the sand core into the core drying oven for 10 minutes.
[0015] The beneficial effects of this invention are that the 3D printing process for the annular water channel of the motor housing adopts a new production process and a sand core reinforcing agent to effectively improve the sand core strength, eliminating the need to use ceramsite sand or pearl sand for printing, thus effectively reducing production costs.
[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.
[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0019] Figure 1 A perspective view of a 3D-printed sand core for a motor housing provided in this embodiment of the present disclosure; Figure 2 for Figure 1 An explosion diagram; Figure 3 This is a schematic diagram of a resin sand figure-eight test block.
[0020] In the picture: Spiral waterway sand core 1. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] Research has found that existing technologies, in order to address the insufficient strength of 3D printed sand cores for annular water channels, mainly use ceramsite sand or abrasive sand for printing. This method is relatively expensive and has a complicated production process, requiring the emptying of all ordinary silica sand from the equipment and the resetting of printing process parameters. Finally, the use of ceramsite sand and abrasive sand also causes significant wear and tear on the nozzles of the 3D printing equipment.
[0023] Based on the above research, this disclosure provides a 3D printing process for annular water channels in motor housings. It adopts a new production process and a sand core reinforcing agent to effectively improve the strength of the sand core, eliminating the need for printing with ceramsite sand or abrasive sand, thus effectively reducing production costs.
[0024] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.
[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0026] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0027] See Figure 1 , Figure 2At least one embodiment illustrates a 3D printing process for an annular waterway in a motor housing, comprising: 1) designing the 3D printing process for the motor housing; 2) 3D printing sand cores using printing materials according to the mass percentages of furan resin for casting 3D inkjet printing, 0.06% curing agent, and the remainder being 3D printing raw sand; 3) allowing the 3D printed sand cores to stand for 24 hours; 4) impregnating the spiral waterway sand cores with a sand core reinforcing agent, the sand core reinforcing agent being a mixture of furfuryl alcohol and ethanol; 5) drying the sand core reinforcing agent: heating the box-type core drying oven to 150°C, turning it off, and placing the spiral waterway sand cores in the core drying oven for 5 minutes; 6) spraying all sand cores with a coating, the coating being graphite-based refractory aggregate and water; 7) drying the coating: heating the box-type core drying oven to 150°C, turning it off, and placing the sand cores in the core drying oven for 10 minutes; 8) assembling the sand cores: assembling the sand cores together according to the process design; 9) casting; 10) cleaning the casting.
[0028] In some embodiments, the furan resin for casting 3D inkjet printing is one or more of furfuryl alcohol and its polymers.
[0029] In some embodiments, the curing agent is p-toluenesulfonic acid, dimethylbenzenesulfonic acid, or water.
[0030] The tensile strength of the resin sand figure-eight specimen used in the experiment (reference) Figure 3 To verify the effect of different conditions on the strength of sand cores, a batch of figure-eight test blocks were 3D printed in the same printing box, with three test blocks per group. The tensile strength of each group of test blocks was measured according to different experimental schemes.
[0031] Table 1. Comparison of tensile strength of standard figure-eight specimens under different resting times.
[0032] As shown in Table 1, the strength of the 3D printed sand core is initially low. After being left to stand for 24 hours, the strength reaches its maximum value. Subsequently, the strength gradually decreases over time.
[0033] Table 2. Comparison of tensile strength of standard figure-eight specimens under different experimental conditions.
[0034] The gas production of test blocks from schemes 1, 3, and 8 was tested, and the specific test results are shown in Table 3 below. Table 3. Comparison of gas production of standard figure-eight test blocks under different experimental conditions.
[0035] Table 2 shows that the core reinforcing agent has a significant effect on enhancing the strength of the sand core. Dip coating is significantly more effective than brush coating. For drying, box-type core drying is more effective than ignition, and a suitable drying temperature is required. The drying time should not be too short or too long. Experiments show that using the dip coating process, drying the sand core in a box-type core drying furnace at 180℃ for 25 minutes results in the greatest increase in the strength of the figure-eight specimen. Table 3 shows that after using the core reinforcing agent, the gas generation and gas generation time of the entire sand core increase significantly. Sufficient venting can compensate for the increased gas generation.
[0036] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.
[0037] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.
[0038] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0039] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.
[0040] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0041] In the description of the embodiments of the present invention, 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 the present invention based on the specific circumstances.
[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.
[0043] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0044] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.
[0045] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A 3D printing process for an annular waterway in a motor housing, characterized in that, include: Step 1, Design of 3D printing process for motor housing; Step 2: 3D print sand cores using printing materials; Step 3: Let the 3D-printed sand core stand still; Step 4: Impregnate the spiral waterway sand core with sand core reinforcing agent; Step 5: Drying the core reinforcement agent; Step 6: Spray paint onto all sand cores; Step 7, paint drying; Step 8, Sand Core Assembly: Assemble the sand cores together according to the process design; Step 9: Casting the part; Step 10: Clean the casting.
2. The 3D printing process for the annular waterway of the motor housing according to claim 1, characterized in that, The printing material comprises the following materials by weight percentage: 0.06% furan resin for casting 3D inkjet printing Hardener 0.26%, The rest is raw sand for 3D printing.
3. The 3D printing process for the annular waterway of the motor housing according to claim 2, characterized in that, The furan resin used for casting 3D inkjet printing is one or more of furfuryl alcohol and its polymers.
4. The 3D printing process for the annular waterway of the motor housing according to claim 2, characterized in that, The curing agent is p-toluenesulfonic acid, dimethylbenzenesulfonic acid, and water.
5. The 3D printing process for the annular waterway of the motor housing according to claim 1, characterized in that, The core reinforcement agent is furfuryl alcohol and ethanol.
6. The 3D printing process for the annular waterway of the motor housing according to claim 1, characterized in that, The coating is composed of graphite-based refractory aggregate and water.
7. The 3D printing process for the annular waterway of the motor housing according to claim 1, characterized in that, 3D printed sand cores are left to stand for 24 hours.
8. The 3D printing process for the annular waterway of the motor housing according to claim 1, characterized in that, The core reinforcement agent is dried as follows: the box-type core drying furnace is heated to 150°C, then turned off, and the spiral water channel core is placed into the core drying furnace for 5 minutes.
9. The 3D printing process for the annular waterway of the motor housing according to claim 1, characterized in that, The coating drying process involves heating the box-type core drying oven to 150°C, turning it off, and placing the sand core into the core drying oven for 10 minutes.