A system and method for analyzing the structure of anti-gravity castings

Abstract

A system and method for analyzing the structure of a counter-gravity casting, and relates to the technical field of casting. The present invention is to solve the problem that the existing counter-gravity casting method still has the problem of being unable to obtain the relationship between the pouring pressure and the geometric characteristics of the casting, and it is difficult to realize the intelligent design of the counter-gravity casting process and the casting cost. The present invention includes: obtaining the casting; establishing a split coordinate system for the casting, and splitting the casting; obtaining the cross-sectional area of ​​the cross-section of the casting after splitting, and drawing a cross-sectional area curve; obtaining the cross-sectional contour area of ​​each cross-sectional area of ​​the casting after splitting, taking the ratio of the cross-sectional area of ​​the current cross-sectional area to the cross-sectional contour area of ​​the current cross-sectional area as the relative cross-sectional area, and drawing a relative cross-sectional area curve; analyzing the casting using the cross-sectional area curve and the relative cross-sectional area curve. The casting parameters are obtained using the cross-sectional area curve and the relative cross-sectional area curve. The present invention is used to analyze the structure of the casting.

Description

Technical Field

[0001] The invention relates to the technical field of casting technology, and in particular to a system and method for analyzing the structure of a counter-gravity casting. Background Art

[0002] Generally, the structure of castings is relatively complex. According to the common casting structure types, castings can be divided into high-tube, shell, disc shaft, and bracket castings. The traditional pouring method is to use gravity pouring. However, due to the use requirements, more thick and thin parts will be designed on the castings, which leads to casting metallurgical defects such as insufficient pouring and cold shut during the traditional gravity pouring process. At the same time, because the traditional pouring method is mainly affected by gravity, the pouring is uncontrollable.

[0003] With the development of technology, counter-gravity casting has been applied. In the counter-gravity casting process, pressure is a parameter that has a great relationship with the geometric structure of the casting itself. Different geometric parts of the casting need to match the corresponding pouring pressure for filling. In the existing counter-gravity casting process, there is a lack of relationship between the geometric features of the castings, which makes the intelligent design of the counter-gravity casting process difficult. Different castings require manual adjustment of the process, which leads to high casting costs. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing counter-gravity casting method still cannot obtain the relationship between the geometric features of the casting, making it difficult to realize the intelligent design of the counter-gravity casting process and the high casting cost, and proposes a counter-gravity casting casting structure analysis system and method.

[0005] A system for analyzing the structure of anti-gravity castings, comprising: a graphic file acquisition module, a casting segmentation module, a cross-sectional area curve acquisition module, a relative cross-sectional area curve acquisition module, and a structure analysis module;

[0006] The graphic file acquisition module is used to acquire the casting graphic file;

[0007] The casting segmentation module: establishes a segmentation coordinate system for the casting graphic file, and uses the segmentation coordinate system to segment the casting graphic;

[0008] The cross-sectional area curve acquisition module is used to acquire the cross-sectional area of ​​each cross section of the divided casting figure and draw a cross-sectional area curve;

[0009] The relative cross-sectional area curve acquisition module is used to acquire the cross-sectional contour area of ​​each cross-section of the divided casting figure, and then the ratio of the cross-sectional area of ​​the current cross-sectional area to the cross-sectional contour area of ​​the current cross-sectional area is used as the relative cross-sectional area, and a relative cross-sectional area curve is drawn;

[0010] The structural analysis module analyzes casting graphics using cross-sectional area curves and relative cross-sectional area curves.

[0011] Furthermore, the system also includes: a casting characteristic structure parameter set acquisition module;

[0012] The casting structure parameter set acquisition module obtains casting parameters of various sizes using the cross-sectional area curve and the relative cross-sectional area curve, and all casting parameters constitute a casting structure parameter set.

[0013] Furthermore, the types of casting patterns include: high tube type, shell type, disc shaft type, and bracket type.

[0014] Furthermore, the establishment of a segmentation coordinate system for the casting graphic file is implemented using UG software;

[0015] The subdivision coordinate system is a positive coordinate system.

[0016] Furthermore, the method of using the split coordinate system to split the casting figure is specifically as follows:

[0017] First, the X, Y or Z axis of the split coordinate system is used as the split axis according to the pouring position;

[0018] Then, define the segmentation interval and segment the casting figure according to the segmentation interval and segmentation axis.

[0019] Furthermore, if there are multiple independent areas on a cross section of the split casting figure, the cross-sectional area of ​​the current cross section is the sum of the multiple independent areas.

[0020] Furthermore, the cross-sectional contour area of ​​each cross section of the split casting figure is: the area of ​​the smallest rectangle that contains the current cross section and is drawn with the split axis as the starting point.

[0021] A method for analyzing the structure of a casting by anti-gravity casting is used to implement a system for analyzing the structure of a casting by anti-gravity casting, comprising the following steps:

[0022] Step 1: Obtain casting graphics file;

[0023] The structural types of the casting graphics include: high cylinder type, shell type, disc shaft type, bracket type;

[0024] Step 2: Establish a segmentation coordinate system for the casting graphic file, and use the segmentation coordinate system to segment the casting graphic;

[0025] Step 2: Input the casting graphics file into UG software and establish the segmentation coordinate system;

[0026] The subdivision coordinate system is a positive coordinate system;

[0027] Step 2: Use the split coordinate system to split the casting figure, specifically:

[0028] First, the X, Y or Z axis of the split coordinate system is used as the split axis according to the pouring position;

[0029] Then, define the segmentation interval, and segment the casting figure according to the segmentation interval and segmentation axis;

[0030] Step 3, obtaining the cross-sectional area of ​​each section of the segmented casting figure, and drawing a cross-sectional area curve;

[0031] Among them, if there are multiple independent areas on a cross section, the cross-sectional area of ​​the current cross section is the sum of the multiple independent areas.

[0032] Step 4: Obtain the cross-sectional contour area of ​​each section of the divided casting figure, then take the ratio of the cross-sectional area of ​​the current section to the cross-sectional contour area of ​​the current section as the relative cross-sectional area, and draw a relative cross-sectional area curve.

[0033] Furthermore, the method further comprises: obtaining a casting parameter structure set:

[0034] The cross-sectional area curve and the relative cross-sectional area curve are used to obtain the casting parameters of various sizes, and all the casting parameters constitute the casting structure parameter set.

[0035] Furthermore, the cross-sectional contour area of ​​each section of the casting figure after segmentation in step 4 is: the area of ​​the smallest rectangle that contains the current section and is drawn with the segmentation axis as the starting point.

[0036] The beneficial effects of the present invention are:

[0037] The present invention first reads the three-dimensional graphics file of the casting, directly analyzes the geometric structure characteristic parameters of the casting according to the graphics segmentation requirements, outputs the graphics characteristic curve, and can obtain the relationship between the pouring pressure and the geometric characteristics of the casting and the parameter set of the characteristic structure of the anti-gravity casting process casting according to the graphics characteristic curve. The casting structure analysis method of the present invention is simple, and can also simplify the processing of complex castings, and is convenient for calculation; the present invention analyzes the geometric characteristics of castings with different geometric characteristics, obtains the pouring process matching the different geometric characteristics of the castings, and finally forms an anti-gravity casting process parameter database, which can quickly analyze the geometric structure characteristic parameters of new castings, facilitate the subsequent process call of new castings, and can make recommendations for subsequent pouring processes for a new casting or similar castings, thereby assisting in the intelligent design of the anti-gravity casting process and reducing the casting cost of castings. At the same time, the present invention is reliable and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1(a) is a non-positive coordinate system for the casting figure;

[0039] Figure 1(b) is the positive coordinate system of the casting figure;

[0040] Figure 2Schematic diagram for changing the coordinate system of casting graphic files;

[0041] Figure 3 This is the result diagram of the analysis of the structural characteristic parameters of the casting;

[0042] Figure 4 (a) is a schematic diagram of a high-tube casting;

[0043] Figure 4(b) is a schematic diagram of a shell casting;

[0044] Figure 4(c) is a schematic diagram of a disk-shaft casting;

[0045] Figure 4(d) is a schematic diagram of a stent-type casting. DETAILED DESCRIPTION

[0046] Specific implementation method 1: This implementation method is a system for analyzing the structure of anti-gravity castings, including: a graphic file acquisition module, a casting segmentation module, a cross-sectional area curve acquisition module, a relative cross-sectional area curve acquisition module, and a structural analysis module;

[0047] The graphic file acquisition module is used to acquire the casting graphic file;

[0048] The structural types of the castings include: high cylinder type, shell type, disc shaft type, bracket type, as shown in Figure 4 (a)-(d);

[0049] The casting segmentation module is used to segment the casting in the casting graphic file, specifically:

[0050] Step 1: Input the casting graphics into UG software to build a WCS coordinate system (division coordinate system) for the casting graphics:

[0051] like Figure 2 As shown, select the "WCS" (Work Coordinate System) drop-down menu in the "Format" of NX-UG, and click the "Dynamic" adjustment function; dynamically adjust the coordinate system angle and origin position to change to the required coordinate position, then right-click in the blank area of ​​the window and click "Confirm" to change; if the coordinates do not change after confirming the change, double-click the coordinate system, and in the pop-up "Base CSYS" window, change the reference to "WCS" to complete the coordinate system change. The split coordinate system should be a positive coordinate (not at an angle with the coordinate system), that is, ensure that the split axis is not at an angle with the base coordinate system. Figure 1 (a) shows the coordinate system before adjustment, and Figure 1 (b) shows the coordinate system after adjustment;

[0052] Step 2: Select the X, Y or Z axis in the WCS coordinate system as the segmentation direction axis, and segment the casting graphics according to the preset segmentation spacing:

[0053] Define the segmentation interval (how many mm intervals between each section); in order to establish a connection between the graphic structure analysis data and the process design parameters, it is necessary to define the segmentation direction coordinate axis according to the actual designed pouring position of the casting, that is, define the vertical direction (gravity direction) of the designed pouring position as the segmentation direction.

[0054] The cross-sectional area curve acquisition module is used to acquire the cross-sectional area of ​​each cross section of the split casting and draw a cross-sectional area curve;

[0055] After a complex structure is divided into sections, there may be multiple independent areas on one section. The total area of ​​the multiple independent areas is the cross-sectional area (actual value).

[0056] The relative cross-sectional area curve acquisition module: obtains the cross-sectional contour area of ​​each cross-section, then obtains the ratio of the cross-sectional area of ​​the current cross-sectional area to the cross-sectional contour area of ​​the current cross-sectional area, i.e., the relative cross-sectional area, and draws the relative cross-sectional area curve:

[0057] The cross-sectional contour area of ​​the current cross-section is: after the complex structure is split, the cross-sectional area is irregular in shape, or there are multiple scattered cross-sections. A rectangle can be drawn according to the splitting coordinate axis, and the minimum rectangular area that can contain all cross-sections is regarded as the cross-sectional contour area.

[0058] Structural analysis module: Analyze castings using cross-sectional area curves and relative cross-sectional area curves;

[0059] After the segmentation calculation is completed, the software interface displays the cross-sectional area change curve and the relative cross-sectional area ratio change curve. Clicking any position on the curve will display the data value of that point, such as Figure 3 shown.

[0060] Specific implementation 2: The system further includes: a casting characteristic structure parameter set acquisition module;

[0061] The casting characteristic structure parameter set acquisition module is used to acquire the casting structure parameter set using the cross-sectional area curve and the relative cross-sectional area curve;

[0062] The characteristic geometric dimensions of the castings were changed, and 10 castings were formed for each basic structure. For these castings, the gating system and casting process parameters were designed, and the process design was optimized through numerical simulation to determine the best solution. The corresponding casting process parameters and characteristic geometric dimensions of the castings are shown in Tables 1 to 4, where D is the diameter of the casting, H is the height of the casting, and A, B, and C are the three-dimensional dimensions of the casting.

[0063] Table 1 Barrel casting dimensions and pouring process parameters

[0064]

[0065] Table 2 Shell casting dimensions and casting process parameters

[0066]

[0067] Table 3 Dimensions and casting process parameters of disk and shaft castings

[0068]

[0069] Table 4 Bracket casting dimensions and casting process parameters

[0070]

[0071] The anti-gravity casting process can better fill the mold of complex castings by adjusting the pouring pressure (overcoming gravity) to reduce casting defects. At the same time, the adjustability of pressure makes the intelligent design of the anti-gravity casting process easy. Among them, the pouring pressure is a parameter that has a large relationship with the geometric structure of the casting itself. Different geometric parts of the casting need to match the corresponding pouring pressure for filling. By analyzing the geometric features of the casting, a pouring process that matches the different geometric features of the casting can be obtained, and finally a database of anti-gravity casting process parameters is formed, which is convenient for subsequent process calls of new castings and reduces the casting cost of castings. The present invention starts UG software in the background to read the three-dimensional graphics file of the casting, directly analyzes the geometric structure characteristic parameters of the casting according to the requirements of the graphic segmentation, outputs the graphic characteristic curve, and finally forms a parameter set of the characteristic structure of the anti-gravity casting process casting according to the graphic characteristic curve.

[0072] Specific implementation method three: A method for analyzing the structure of a counter-gravity casting, comprising the following steps:

[0073] S1. Obtain casting graphic files;

[0074] The structural types of the casting graphics include: high cylinder type, shell type, disc shaft type, bracket type;

[0075] S2. Establishing a segmentation coordinate system for the casting graphic file, and using the segmentation coordinate system to segment the casting graphic;

[0076] S21. Input the casting graphic file into UG software to establish a segmentation coordinate system;

[0077] The subdivision coordinate system is a positive coordinate system;

[0078] S22. Use the split coordinate system to split the casting figure, specifically:

[0079] First, the X, Y or Z axis of the split coordinate system is used as the split axis according to the pouring position;

[0080] Then, define the segmentation interval, and segment the casting figure according to the segmentation interval and segmentation axis;

[0081] S3, obtaining the cross-sectional area of ​​each section of the divided casting figure, and drawing a cross-sectional area curve;

[0082] Among them, if there are multiple independent areas on a cross section, the cross-sectional area of ​​the current cross section is the sum of the multiple independent areas.

[0083] S4, obtaining the cross-sectional contour area of ​​each cross section of the divided casting figure, and then taking the ratio of the cross-sectional area of ​​the current cross section to the cross-sectional contour area of ​​the current cross section as the relative cross-sectional area, and drawing a relative cross-sectional area curve;

[0084] The cross-sectional contour area of ​​each section of the casting figure after segmentation is: the area of ​​the smallest rectangle that can contain the current section by taking the segmentation axis as the starting point.

[0085] S5. Get the casting parameter structure set:

[0086] The cross-sectional area curve and the relative cross-sectional area curve are used to obtain the casting parameters of various sizes, and all the casting parameters constitute the casting structure parameter set.

Claims

1. A system for analyzing the structure of anti-gravity castings, characterized in that The system comprises: a graphic file acquisition module, a casting segmentation module, a cross-sectional area curve acquisition module, a relative cross-sectional area curve acquisition module, and a structural analysis module; The graphic file acquisition module is used to acquire the casting graphic file; The casting segmentation module: establishes a segmentation coordinate system for the casting graphic file, and uses the segmentation coordinate system to segment the casting graphic; The cross-sectional area curve acquisition module is used to acquire the cross-sectional area of ​​each cross section of the divided casting figure and draw a cross-sectional area curve; The relative cross-sectional area curve acquisition module is used to acquire the cross-sectional contour area of ​​each cross-section of the divided casting figure, and then use the ratio of the cross-sectional area of ​​the current cross-sectional area to the cross-sectional contour area of ​​the current cross-sectional area as the relative cross-sectional area, and draw the relative cross-sectional area curve; The cross-sectional contour area of ​​each cross section of the split casting figure is: the area of ​​the smallest rectangle that contains the current cross section and is drawn with the split axis as the starting point; The structural analysis module analyzes casting graphics using cross-sectional area curves and relative cross-sectional area curves.

2. The anti-gravity casting structure analysis system according to claim 1, characterized in that: The system further comprises: a casting characteristic structure parameter set acquisition module; The casting characteristic structure parameter set acquisition module obtains casting parameters of various sizes using cross-sectional area curves and relative cross-sectional area curves, and all casting parameters constitute a casting structure parameter set.

3. A counter-gravity casting structure analysis system according to claim 1 or 2, characterized in that: The types of casting patterns include: high cylinder type, shell type, disc shaft type, and bracket type.

4. The anti-gravity casting structure analysis system according to claim 3, characterized in that: The establishment of the segmentation coordinate system for the casting graphic file is implemented by using UG software; The subdivision coordinate system is the WCS coordinate system, which is a positive coordinate system.

5. The anti-gravity casting structure analysis system according to claim 4, characterized in that: The method of using the split coordinate system to split the casting figure is specifically as follows: First, the X, Y or Z axis of the split coordinate system is used as the split axis according to the pouring position; Then, define the segmentation interval and segment the casting figure according to the segmentation interval and segmentation axis.

6. The anti-gravity casting structure analysis system according to claim 5, characterized in that: For the casting figure after segmentation, if there are multiple independent areas on a section, the cross-sectional area of ​​the current section is the sum of the multiple independent areas.

7. A method for analyzing the structure of a counter-gravity casting, used to execute a system for analyzing the structure of a counter-gravity casting as claimed in any one of claims 1 to 6, wherein the method comprises the following steps: Step 1: Obtain casting graphics file; The structural types of the casting graphics include: high cylinder type, shell type, disc shaft type, bracket type; Step 2: Establish a segmentation coordinate system for the casting graphic file, and use the segmentation coordinate system to segment the casting graphic; Step 2: Input the casting graphics file into UG software and establish the segmentation coordinate system; The subdivision coordinate system is a positive coordinate system; Step 2: Use the split coordinate system to split the casting figure, specifically: First, the X, Y or Z axis of the split coordinate system is used as the split axis according to the pouring position; Then, define the segmentation interval, and segment the casting figure according to the segmentation interval and segmentation axis; Step 3, obtaining the cross-sectional area of ​​each section of the segmented casting figure, and drawing a cross-sectional area curve; Among them, if there are multiple independent areas on a cross section, the cross-sectional area of ​​the current cross section is the sum of the multiple independent areas; Step 4: Obtain the cross-sectional contour area of ​​each cross section of the divided casting figure, then take the ratio of the cross-sectional area of ​​the current cross section to the cross-sectional contour area of ​​the current cross section as the relative cross-sectional area, and draw a relative cross-sectional area curve; The cross-sectional contour area of ​​each section of the casting figure after segmentation in the step 4 is: the area of ​​the smallest rectangle that contains the current section and is drawn with the segmentation axis as the starting point.

8. The method for analyzing the structure of a counter-gravity casting according to claim 7, characterized in that: The method further comprises: obtaining a casting parameter structure set: The cross-sectional area curve and the relative cross-sectional area curve are used to obtain the casting parameters of various sizes, and all the casting parameters constitute the casting structure parameter set.

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