Intelligent construction method for complex differential casting mold based on modular sand mold unit

Abstract

The invention discloses an intelligent construction method for a complex differential casting mold based on a modularized sand mold unit, which is characterized by comprising the following steps of: dividing the sand mold unit into a core function group, a connection transition group and an external contour group after decomposing the sand mold unit; according to the design requirements of the differential mechanism, sand mold units meeting the design requirements of the differential mechanism are screened out from the core function set and the outer contour set in sequence, then sand mold units are screened out from the connection transition set, the screened sand mold units have the assembly relation, and the multiple sand mold units meeting the assembly relation are assembled together; forming a sand mold unit combination matched with the differential mechanism; the output is a differential casting three-dimensional model. Substantially, a complex casting mold is disassembled into a plurality of standardized units, and rapid construction of the transmission casting mold is achieved through combination of the standardized units. And a new sand mold three-dimensional model is prevented from being manufactured again. The time is saved, and the efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and specifically to a method for intelligent construction of complex differential molds based on modular sand mold units. Background Technology

[0002] Sand molds are used to create castings, serving as the internal core of the mold. Coated sand is sprayed out using an injection molding machine, solidified, and then dried before use. They can also be made from virgin sand and resin. They are particularly suitable for creating workpieces with complex internal structures. For example, the differential, as a core component of the automotive transmission system, has complex internal surfaces, uneven wall thickness, and high assembly precision requirements. Traditional differential casting often uses integral sand casting, which has shortcomings. If different specifications of differentials need to be produced, time must be spent designing new sand molds and manufacturing new molds, resulting in low efficiency. Summary of the Invention

[0003] To overcome the aforementioned shortcomings, the purpose of this invention is to provide an intelligent construction method for complex differential molds based on modular sand mold units. By utilizing the core functional groups, connecting transition groups, and external contour groups that have been pre-designed and decomposed from the sand mold, a new three-dimensional sand mold model is recombined, avoiding repetitive design and saving time.

[0004] To achieve the above objectives, the technical solution adopted by the invention is: a method for intelligently constructing complex differential molds based on modular sand mold units, characterized in that the method includes the following steps:

[0005] a: Import the 3D model of several sand mold elements into the CAE analysis software and save it;

[0006] b: Identify the structural features of the sand mold unit. Using the center axis of the differential as a reference, decompose the sand mold unit into a core functional group, a connecting transition group, and an external contour group.

[0007] c: For each sand mold unit, record its shape, structure, type, size parameters, assembly information and other characteristics, and assign a unique identification ID to each sand mold unit;

[0008] d: According to the design requirements of the differential, sand mold units that meet the design requirements of the differential are selected from the core functional group and the external contour group in sequence. Then, sand mold units are selected from the connection transition group. The selected sand mold units have an assembly relationship. Several sand mold units that meet the assembly relationship are assembled together to form a sand mold unit combination that matches the differential.

[0009] e: Combine and fix the sand mold units together to output a three-dimensional model of the differential casting.

[0010] A further provision of the invention is that, in step d, if the combined sand mold unit has a gap, then a new sand mold unit matching the gap is made, and steps a, b, c, and d are executed again.

[0011] A further feature of the invention is that the sand mold unit in the connecting transition group includes a general sand mold unit, the general sand mold unit being rectangular in shape.

[0012] A further provision of the invention is that, after step d is performed, a step of setting several reinforcing ribs inside the sand mold unit assembly is also included.

[0013] A further provision of the invention is that the differential casting three-dimensional model is sent to an intelligent 3D printer; the 3D printer gradually prints out the sand mold three-dimensional model.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: Sand mold units that meet the design requirements of the differential are selected sequentially from the core functional group and the external contour group. Then, sand mold units are selected from the connecting transition group. The selected sand mold units have assembly relationships. Several sand mold units that meet the assembly relationships are assembled together to form a sand mold unit combination that matches the differential. Essentially, this breaks down a complex casting mold into multiple standardized units, and the rapid construction of the transmission casting mold is achieved through the combination of these standardized units. This saves time and improves efficiency. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating a preferred embodiment of the invention of a method for intelligently constructing complex differential molds based on modular sand mold units. Detailed Implementation

[0016] The preferred embodiments of the invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the invention.

[0017] See appendix Figure 1 As shown in this embodiment, a method for intelligently constructing complex differential molds based on modular sand casting units is characterized by the following steps:

[0018] a: Import the 3D model of several sand mold elements into the CAE analysis software and save it;

[0019] b: Identify the structural features of the sand mold unit. Using the center axis of the differential as a reference, decompose the sand mold unit into a core functional group, a connecting transition group, and an external contour group.

[0020] c: For each sand mold unit, record its shape, structure, type, size parameters, assembly information and other characteristics, and assign a unique identification ID to each sand mold unit;

[0021] d: According to the design requirements of the differential, sand mold units that meet the design requirements of the differential are selected from the core functional group and the external contour group in sequence. Then, sand mold units are selected from the connection transition group. The selected sand mold units have an assembly relationship. Several sand mold units that meet the assembly relationship are assembled together to form a sand mold unit combination that matches the differential.

[0022] e: Combine and fix the sand mold units together to output a three-dimensional model of the differential casting.

[0023] In step d, if the assembled sand mold unit has a gap, a new sand mold unit matching the gap is made, and steps a, b, c, and d are executed again to fill the gap and form a complete sand mold. When the size of the sand mold unit in the transition group is insufficient and fails to connect the sand mold units in the core functional group and the outer contour group, a general sand mold unit is used to fill the gap. The sand mold units connecting the transition group include general sand mold units, which are rectangular or have a hollow frustum shape. This improves the assembly freedom. Due to insufficient local strength of the sand mold unit, to avoid breakage, after step d, a step of setting several reinforcing ribs inside the sand mold unit assembly is also included. The differential casting 3D model is sent to the intelligent 3D printer; the 3D printer gradually prints the 3D model of the sand mold. The intelligent 3D printer is existing technology, and its detailed structure and principle will not be described in detail in this patent.

[0024] In summary, the principle of the intelligent construction method for complex differential molds based on modular sand mold units, as shown in the invention, is as follows: First, the existing three-dimensional model of the sand mold unit is imported into CAE analysis software and saved; then, the sand mold unit is decomposed into a core functional group, a connecting transition group, and an external contour group. The core functional group includes the gear carrier, the connecting transition group includes the neck, and the external contour group includes the volute.

[0025] Sand mold units that meet the differential design requirements, namely the volute and the core functional group and the external contour group, are selected sequentially. Then, sand mold units, namely the necks, are selected from the connection transition group. The selected sand mold units have assembly relationships. Several sand mold units that meet the assembly relationships are assembled together to form a sand mold unit combination that matches the differential. The volute is connected to the gear carrier on both sides via a neck. Essentially, this process breaks down the complex mold into multiple standardized units, achieving rapid construction of the transmission mold through the combination of these standardized units. This avoids the need to create new 3D sand mold models, saving time and improving efficiency.

[0026] The above embodiments are only for illustrating the technical concept and features of the invention. Their purpose is to enable those skilled in the art to understand the content of the invention and implement it. They should not be used to limit the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included in the scope of protection of the invention.

Claims

1. A method for intelligently constructing complex differential molds based on modular sand casting units, characterized in that, The method includes the following steps: a: Import the 3D model of several sand mold elements into the CAE analysis software and save it; b: Identify the structural features of the sand mold unit. Using the center axis of the differential as a reference, decompose the sand mold unit into a core functional group, a connecting transition group, and an external contour group. c: For each sand mold unit, record its shape, structure, type, size parameters, assembly information and other characteristics, and assign a unique identification ID to each sand mold unit; d: According to the design requirements of the differential, sand mold units that meet the design requirements of the differential are selected from the core functional group and the external contour group in sequence. Then, sand mold units are selected from the connection transition group. The selected sand mold units have an assembly relationship. Several sand mold units that meet the assembly relationship are assembled together to form a sand mold unit combination that matches the differential. e: Combine and fix the sand mold units together to output a three-dimensional model of the differential casting.

2. The intelligent construction method for complex differential molds based on modular sand mold units according to claim 1, characterized in that, In step d, if the combined sand mold unit has a gap, then a new sand mold unit matching the gap is made, and steps a, b, c, and d are executed again.

3. The intelligent construction method for complex differential molds based on modular sand mold units according to claim 1, characterized in that, The sand mold unit in the connection transition group includes a general sand mold unit, which is rectangular in shape.

4. The intelligent construction method for complex differential molds based on modular sand mold units according to claim 1, characterized in that, After step d is performed, the process also includes setting several reinforcing ribs inside the sand mold unit assembly.

5. The intelligent construction method for complex differential molds based on modular sand mold units according to claim 1, characterized in that, The differential casting 3D model is sent to the intelligent 3D printer; the 3D printer gradually prints out the sand mold 3D model.

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