A core box fixing device for casting core making and its fixing optimization method

Abstract

The present invention relates to the technical field of industrial casting equipment, and in particular to a core box fixing device for casting core making. The core box fixing mechanism includes a fixed clamping workpiece, the fixed clamping workpiece is welded with four long steel plates to form a rectangular steel plate frame with a hollow structure, the fixed clamping workpiece is welded with stabilizing legs on the side, and two stabilizing legs are installed on each side of the fixed clamping workpiece to form a fixed support structure with four legs; the other side of the fixed clamping workpiece is welded with a hanger, and four hangers are provided, distributed near each of the stabilizing legs, so that the four hangers are symmetrical in pairs. The present invention can effectively solve the problems of sand core deformation, sand core size being too large or too small, and poor fit between sand cores caused when the disposable core box outer frame cannot be fixed during the casting core making process, greatly improve the overall quality of casting core making, and optimize the structural performance of casting core making.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial casting equipment, and in particular to a core box fixing device for casting core making and a fixing optimization method thereof. Background Art

[0002] Disposable core boxes are extremely common in foundry production. Currently, the outer frame structure of disposable core boxes is relatively simple, and they are generally made of polystyrene. During the core-making process, due to the weight of the sand body, the core box is subjected to lateral pressure under the action of gravity, causing the sand core to expand outward, resulting in an oversized sand core. Currently, the industry generally uses locking pliers to clamp the core box to control deformation. During operation, the locking pliers concentrate the force on the outer side of the core box, resulting in severely uneven pressure distribution on the outer side of the core box during core making. This uneven force directly causes the sand core side to appear wavy during the forming process, seriously affecting the precise control of the sand core size.

[0003] Because the sand core size is out of control and the side is wavy, if such sand core does not meet the size standard, firstly, the sand core will be directly scrapped and remade, resulting in a waste of raw materials and greatly increasing the production time cost; secondly, the sand core is manually polished to reach the qualified size, but this manual operation not only consumes a lot of man-hours, but also makes it difficult to ensure that the size of the sand core after polishing is completely consistent, and it is difficult to fundamentally solve the problem of sand core quality stability. Summary of the Invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a core box fixing device for casting core making and a fixing optimization method thereof.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides a core box fixing device for casting core making, the core box fixing device comprising a core box fixing mechanism:

[0007] The core box fixing mechanism includes a fixed clamping workpiece, which is welded with four long steel plates to form a rectangular steel plate frame with a hollow structure. The side of the fixed clamping workpiece is welded with stabilizing legs. Two stabilizing legs are installed on each side of the fixed clamping workpiece to form a four-legged fixed support structure.

[0008] A hanger is welded on the other side of the fixed clamping workpiece. Four hangers are provided and distributed near each of the stabilizing legs, so that the four hangers are symmetrical in pairs.

[0009] Furthermore, in a preferred embodiment of the present invention, each of the lifting handles has the same appearance and is in the shape of a sickle, and is used for lifting and fixing the device and the upper and lower positioning of the plurality of core box fixing mechanisms.

[0010] Furthermore, in a preferred embodiment of the present invention, each side surface of the fixed clamping workpiece is provided with a plurality of circular through holes with the same aperture, and the plurality of circular through holes on each side surface of the fixed clamping workpiece are arranged in a line in a horizontal array.

[0011] Furthermore, in a preferred embodiment of the present invention, a metal nut is welded inside the circular through hole to form an adjustable fastening structure.

[0012] Furthermore, in a preferred embodiment of the present invention, each of the metal nuts is threadedly connected to a screw rod, and a fixed pressure plate is welded to the front end of the screw rod.

[0013] Furthermore, in a preferred embodiment of the present invention, the fixed pressure plate is a rectangular steel plate, and the fixed pressure plate is moved forward to support and clamp the casting sand core box by adjusting the screw.

[0014] Furthermore, in a preferred embodiment of the present invention, the fixed pressure plates on both sides of the fixed clamping workpiece form a 90° relative limiting pressure trend to fix the casting sand core box.

[0015] Furthermore, in a preferred embodiment of the present invention, the fixing device is composed of three layers of core box fixing mechanisms stacked from bottom to top, and the core box fixing mechanism of the upper layer is spliced ​​with the top of the stabilizing legs of the lower layer core box fixing mechanism through the bottom end of the stabilizing legs.

[0016] The present invention also provides a method for optimizing the fixing of a core box fixing device for casting core making, comprising the following steps:

[0017] Obtain target process specification parameters of the casting sand core box, and simultaneously obtain a preset fixing strategy of the core box fixing device determined based on the target process specification parameters;

[0018] The original fixing parameters of the core box fixture for the casting sand core box are extracted through a preset fixing strategy. The target process specification parameters are defined according to the original fixing parameters to establish a simulation model of the core box fixture clamping the casting sand core box.

[0019] Constructing a series of vibration signals, performing vibration fixed simulation by injecting the series of vibration signals into a fixed simulation model, recording morphological data of the casting sand core box during the simulation process, and obtaining simulated fixed mutation boundaries of abnormal morphology of the casting sand core box under vibration environment conditions;

[0020] Obtain the spatially fixed distribution points of the core box fixture for the casting sand core box and the reference fixed size of each spatially fixed distribution point, preset the fixed offset coverage volume of each spatially fixed distribution point according to the reference fixed size, and divide the three-dimensional model of the casting sand core box in the simulation state of the core box fixture clamping into several coverage box blocks based on the coverage volume;

[0021] Create a dimension statistics empty stack with the covering volume as the bounding constraint. If at least one edge of the covering box block overlaps with the simulated fixed mutation boundary, mark the covering box block as a non-empty box and store it in the dimension statistics empty stack. Obtain the logarithm of the non-empty box deformation law generated by the fixed mutation boundary caused by the vibration environment.

[0022] A logarithmic coordinate system is constructed, and the logarithm of the deformation law of the non-empty box is linearly fitted through the logarithmic coordinate system to obtain the peak value of the deformation law curve of each cover box block. Only the spatial fixed distribution points corresponding to the cover box blocks whose fixed deformation law curve peak value is greater than the preset peak value are extracted and calibrated as fixed points to be optimized.

[0023] The beneficial technical effects of the present invention are:

[0024] The present invention is capable of clamping the core box uniformly and stably by arranging a screw and a fixed pressure plate on the fixed clamping workpiece, effectively resisting the lateral pressure during sanding, and fundamentally avoiding the problem of dimensional deviation of the sand core caused by the deformation of the core box, ensuring the accuracy of the sand core size and improving product quality; and the operation process only requires adjusting the length of the screw to achieve the clamping of the core box, and the operation process is more simplified and humane. The present invention adapts to core boxes of different sizes by flexibly adjusting the advance and retreat of the screw and the fixed pressure plate. There is no need to make tooling separately for different core boxes, which reduces the cost of tooling development and improves the efficiency of tooling use. In addition, the present invention uses steel plates welded into a rectangular shape, with stabilizing legs and handles, and the overall structure is stable. During operations such as lifting and clamping the core box, it can maintain good stability to ensure the smooth progress of the core making work. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure of the device with stacked and fixed casting sand core boxes;

[0027] Figure 2 Schematic diagram of the overall structure of the core box fixing mechanism;

[0028] Figure 3 It is a schematic diagram of the local structure of the core box fixing mechanism.

[0029] The following are the descriptions of the reference numerals:

[0030] 101. Core box fixing mechanism; 102. Fixing and clamping workpiece; 103. Stabilizing legs; 104. Hanging handle; 105. Circular through hole; 106. Screw; 107. Fixed pressure plate; 108. Casting sand core box. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner. Therefore, they only show the structures related to the present invention. It should be noted that, unless there is a conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0034] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0035] like Figure 1-3 As shown, the first aspect of the present invention provides a core box fixing device for casting core making, the core box fixing device includes a core box fixing mechanism 101:

[0036] The core box fixing mechanism 101 includes a fixed clamping workpiece 102, which is welded with four long steel plates to form a rectangular steel plate frame with a hollow structure. Stabilizing legs 103 are welded on the side of the fixed clamping workpiece 102. Two stabilizing legs 103 are installed on each side of the fixed clamping workpiece 102 to form a fixed support structure with four legs distributed.

[0037] A hanger 104 is welded to the other side of the fixed clamping workpiece 102 . Four hangers 104 are provided and distributed near each of the stabilizing legs 103 , so that the four hangers 104 are symmetrical in pairs.

[0038] It should be noted that before casting the core, the casting sand core box 108 is placed on the horizontal ground, and the lifting handle 104 on the fixed clamping workpiece 102 is grabbed by the existing crane equipment, and the fixed clamping workpiece 102 is lifted to the casting sand core box 108, so that the casting sand core box 108 and a corner of the fixed clamping workpiece 102 are close to each other, thereby completing the preparation process before fixing the casting sand core box 108.

[0039] Each of the lifting handles 104 has the same appearance and is in a sickle shape, and is used for lifting the core box fixing mechanism 101 and positioning multiple core box fixing mechanisms up and down.

[0040] It should be noted that the precise design of the hanger 104 can serve as an auxiliary positioning element, allowing the fixed clamping workpiece 102 to be quickly aligned with the position of the casting sand core box 108 during the lifting and placement process. The hanger 104 not only bears the load-bearing and connection functions during lifting, but also plays a crucial guiding and positioning role in the use of multiple core box fixing mechanisms stacked up and down, reducing manual adjustment time. Through the structural optimization and precision control of the hanger 104, it can be effectively ensured that the fixed clamping workpiece 102 always maintains a consistent installation posture during repeated use, avoiding fixing errors and process interference caused by position deviations, and greatly improving casting processing efficiency and product quality consistency. The lifting, positioning and transportation of the fixed clamping workpiece 102 through the hanger 104 structure can not only improve the fixing efficiency, but also avoid jamming and collisions caused by human handling deviations, ensuring the safety of the lifting operation of the fixed clamping workpiece 102 to fix the casting sand core box 108.

[0041] Each side surface of the fixing and clamping workpiece 102 is provided with a plurality of circular through holes 105 with the same aperture, and the plurality of circular through holes 105 on the side surface of each fixing and clamping workpiece 102 are arranged in a line in a horizontal array.

[0042] A metal nut is welded inside the circular through hole 105 to form an adjustable fastening structure.

[0043] Each of the metal nuts is threadedly connected to a screw rod 106 , and a fixed pressing plate 107 is welded to the front end of the screw rod 106 .

[0044] It should be noted that when the casting sand core box 108 is placed inside the fixed clamping workpiece 102, the casting operator adjusts the extension length of the screw 106 by rotating the screw 106 on the side of the fixed clamping workpiece 102 in the forward direction. The thread on the screw 106 cooperates with the thread of the metal nut in the circular through hole 105, thereby pushing the fixed pressure plate 107 toward the casting sand core box 108, so that the fixed pressure plate 107 at the front end of the screw 106 gradually presses the casting sand core box 108 near a corner of the fixed clamping workpiece 102. The operator can flexibly adjust the extension length of the screw 106 according to the actual size of the casting sand core box 108 and the core making process requirements, and use the telescopic adjustment of the screw 106 to achieve uniform and stable clamping of the core box, thereby effectively resisting the lateral pressure generated by the weight of the sand body during the core making process, ensuring that the sand core is accurate in size after molding, and fundamentally solving the problem of sand core size deviation and deformation.

[0045] The fixed pressing plate 107 is a rectangular steel plate, and the fixed pressing plate 107 is moved forward to support and clamp the casting sand core box 108 by adjusting the screw 106 .

[0046] The fixed pressure plates 107 on both sides of the fixed clamping workpiece 102 form a 90° relative limiting pressure trend to fix the casting sand core box 108.

[0047] It should be noted that the fixed pressure plates on both sides of the final fixed clamping workpiece 102 exert a certain three-dimensional support force in the direction of the interior of the casting sand core box 108 at 90 degrees. The applied three-dimensional support force can provide a certain degree of support and fixation for the casting sand core box 108, thereby preventing the core sand from exerting lateral pressure to expand outward under the action of gravity, which causes the size of the casting sand core box to increase, reducing the phenomenon of manual remaking and scrap rate of manual sand core size correction, significantly reducing casting time and material waste, improving production efficiency, reducing production costs, and achieving cost reduction and efficiency improvement. The shape integrity of the casting sand core box 108 is improved, the global deviation of the disposable core box outer frame structure is eliminated, and the quality of the workpiece casting meets the requirements.

[0048] The fixing device is composed of three layers of core box fixing mechanisms 101 stacked from bottom to top, and the core box fixing mechanism 101 of the upper layer is spliced ​​with the top of the stabilizing legs 103 of the lower layer core box fixing mechanism 101 through the bottom end of the stabilizing legs 103.

[0049] It should be noted that when faced with core boxes of different heights, the number of core box fixing mechanisms 101 is increased for superimposed fixation. By adjusting the extension length of the screw 106, the fixed pressure plate 107 at the front end of the screw 106 gradually presses the casting sand core box 108 close to the corner of the fixed clamping workpiece 102 to complete the initial fixation. At this time, the second core box fixing mechanism 101 is hoisted again according to the above steps so that its stabilizing legs 103 are docked with the stabilizing legs 103 of the first core box fixing mechanism 101, and stacked in sequence. Similarly, the clamping position of the second core box fixing mechanism 101 is adjusted by rotating the screw 106 to ensure that the core box is firmly clamped. Compared with traditional fixing equipment, it can meet the fixing requirements of core boxes of different heights, improve the fixing compatibility of casting sand core boxes, and effectively expand the fault tolerance specifications of different disposable core boxes.

[0050] This embodiment also provides a method for optimizing the fixing of a core box fixing device for casting core making, comprising the following steps:

[0051] Obtain target process specification parameters of the casting sand core box, and simultaneously obtain a preset fixing strategy of the core box fixing device determined based on the target process specification parameters;

[0052] The original fixing parameters of the core box fixture for the casting sand core box are extracted through a preset fixing strategy. The target process specification parameters are defined according to the original fixing parameters to establish a simulation model of the core box fixture clamping the casting sand core box.

[0053] Constructing a series of vibration signals, performing vibration fixed simulation by injecting the series of vibration signals into a fixed simulation model, recording morphological data of the casting sand core box during the simulation process, and obtaining simulated fixed mutation boundaries of abnormal morphology of the casting sand core box under vibration environment conditions;

[0054] Obtain the spatially fixed distribution points of the core box fixture for the casting sand core box and the reference fixed size of each spatially fixed distribution point, preset the fixed offset coverage volume of each spatially fixed distribution point according to the reference fixed size, and divide the three-dimensional model of the casting sand core box in the simulation state of the core box fixture clamping into several coverage box blocks based on the coverage volume;

[0055] Create a dimension statistics empty stack with the covering volume as the bounding constraint. If at least one edge of the covering box block overlaps with the simulated fixed mutation boundary, mark the covering box block as a non-empty box and store it in the dimension statistics empty stack. Obtain the logarithm of the non-empty box deformation law generated by the fixed mutation boundary caused by the vibration environment.

[0056] A logarithmic coordinate system is constructed, and the logarithm of the deformation law of the non-empty box is linearly fitted through the logarithmic coordinate system to obtain the peak value of the deformation law curve of each cover box block. Only the spatial fixed distribution points corresponding to the cover box blocks whose fixed deformation law curve peak value is greater than the preset peak value are extracted and calibrated as fixed points to be optimized.

[0057] It should be noted that due to the variable casting environment in which the core making process is located, there are different vibration factors. In the casting core making process, especially when the core sand is not completely hardened, it is subjected to excessive or frequent vibrations, which may cause the sand core to become further loose before being fixed, causing cracks, peeling or pores on the sand core surface, causing the sand core to be misplaced or deformed, making assembly difficult or even scrapped, affecting its density and strength after fixation, and thus reducing the surface quality of the casting. Therefore, the fixing parameters affected by vibration after the casting core is fixed are further optimized, but the core sand is in a granular state, and the local deformation law of the sand mold structure caused by vibration is random. The use of traditional manual positioning of points with a large degree of deformation is inefficient, time-consuming and labor-intensive, and it is difficult to ensure the traceability accuracy of the required optimization area. In this regard, this method simulates the boundary mutation of the box body caused by the core sand in the box being clamped by the core box fixing device under the vibration environment, replacing the tedious steps of traditional manual field observation and positioning, saving a lot of manpower and material costs, and quickly and accurately tracing the potential laws of the core box deformation caused by the vibration environment, significantly improving the fixing optimization efficiency of the casting core box. Since the casting core is still affected by the vibration environment, lateral pressure will still expand outward, and the core box fixing mechanism mainly applies an inward fixed support force to fix the casting core. It can be seen that the core box deformation caused by the vibration factor is mostly concentrated at the fixed pressure plate that applies the fixed support force, that is, the fixed pressure plate is defined as a spatial fixed distribution point. According to the reference fixed size of the spatial fixed distribution point, this method constructs the coverage volume parameter of the core box boundary coverage deviation caused by the unstable fixed pressure plate support force. Based on the coverage volume, the three-dimensional model of the casting sand core box in the simulation state of the core box fixing device clamping and fixing is divided into several n×n square coverage box blocks. In this way, the occupancy of the casting sand core box boundary deviation from the fixed pressure plate can be analyzed from different resolutions. Through multi-scale division, whether the random deformation of each boundary of the casting sand core box under the vibration factor has self-similar characteristics is further revealed, so that the abnormal deformation law of the core box edge caused by the application of vibration factors can be captured and characterized more accurately, providing a reliable law tracking basis for the subsequent unreasonable fixing area.

[0058] It should be noted that if at least one edge of a cover box block overlaps with the simulated fixed mutation boundary, this indicates that the area within the cover box block may experience random core box boundary deformation, to varying degrees, caused by outward expansion of the core sand. This describes the spatial deformation occupation of the core box boundary structure due to random expansion at different vibration scales, revealing the density and distribution of the core box boundary structure in space. This can be rough and fragmented, or smooth and continuous. This provides the basis for determining the rationality of further local deformation of the core box under fixed conditions due to vibration factors. The dimensionality statistics empty stack is used to store the regular dimension of the boundary deformation. At this point, each cover box region with overlapping overlap is assigned a corresponding non-empty box deformation regularity logarithm describing the deformation amplitude. Linearly fit the logarithm of the deformation law of these non-empty boxes to obtain the peak value of the deformation law curve of each cover box block. The peak value is the peak point expressing the maximum deformation amplitude. If the peak value of the fixed deformation law curve is greater than the preset peak value, it means that the cover box block will still have a large degree of outward expansion deformation under the influence of vibration under the support of the fixed pressure plate, which means that the support and fixing force of the fixed pressure plate for this area is relatively weak or small, and should be improved and optimized accordingly, so it is calibrated as a fixed point to be optimized. This method can simulate the deformation area of ​​casting core making with random appearance but potential rules under vibration factors, and can accurately and efficiently trace the unreasonable fixing position of the core box fixing mechanism for casting core making, thereby providing an optimization basis for the vibration elimination and fixation of the core box fixing device, and greatly improving the fixing performance of the core box fixing device.

[0059] Furthermore, in a preferred embodiment of the present invention, the following steps are also included:

[0060] Acquire multiple local deformation coordinate points of the fixed mutation boundary of the casting sand core box located at each fixed point to be optimized during the simulation process, which gradually deform due to the vibration environment, and simultaneously obtain the specified amplitude spectrum of each vibration signal and the vibration step length of each vibration signal advancing to the next vibration signal during the simulation;

[0061] A Fourier transform algorithm is introduced to calculate the time-frequency distribution of the vibration function of the specified amplitude spectrum in the Fourier transform algorithm based on the vibration step size, so as to obtain the spectrum amplitude distribution characteristics of each vibration signal that is deformed as the fixed mutation boundary is affected by the vibration step size;

[0062] Based on the spectrum amplitude distribution characteristics, a segmentation rule is preset for each vibration signal that causes a fixed mutation boundary deformation. Following the segmentation rule, each local deformation coordinate point is segmented one by one to reach the midpoint boundary between adjacent local deformation coordinate points, and the deformation perpendicular bisector of adjacent local deformation coordinate points is obtained;

[0063] Obtaining multiple local initial coordinate points corresponding to the deformation of each local deformation coordinate point that is not affected by the vibration environment, splicing the common area where the deformation perpendicular bisectors of each pair of local deformation coordinate points intersect each other to obtain a deformation fixed polygon, and interpolating each local initial coordinate point into the deformation fixed polygon to adjust the structure and obtain a starting fixed polygon;

[0064] After the adjustment, the neighboring points adjacent to each local deformation coordinate point in the starting fixed polygon are extracted and defined as natural deformation neighboring points. At the same time, the area value of the deformed fixed polygon is obtained and defined as the first area value, and the area value of the initial fixed polygon is obtained and defined as the second area value.

[0065] The area difference between the first area value and the second area value is calculated, and the deformation amplitude of each local deformation coordinate point reaching the corresponding natural deformation neighboring point is determined based on the area difference. The fixed parameters of each fixed point to be optimized to eliminate vibration deformation are optimized based on the deformation amplitude.

[0066] It should be noted that after determining the fixed pressure plate point that needs to be optimized, the screw can be further adjusted to increase the support strength to prevent the vibration factors in the fixed state from still affecting the core sand to expand outward. However, the traditional fixed pressure plate adjustment depends on the operator's experience and judgment. This adjustment has a large deviation, which can easily cause the core box fixation to have a negative optimization phenomenon for the fixing performance of the casting core making, but will increase the range and trend of the core sand's external expansion. Therefore, before adjusting and optimizing the fixed support strength of each fixed point to be optimized, it is crucial to clarify the deformation degree of the casting sand core box boundary during the simulation process. To this end, this method first obtains multiple local deformation coordinate points after the casting sand core box boundary is deformed during the simulation process. These local deformation coordinate points express the specific end points after the box boundary expands and deforms, and the expansion deformation of the boundary is caused by the vibration signal gradually applied as the simulation time sequence appears. Specifically, the degree of deformation of the core box boundary depends on the change of vibration. Therefore, the spectral characteristics applied by the vibration signal according to a certain time sequence step during the simulation process are the amplitude benchmarks for interpreting and dividing the areas where the core box boundary deformation occurs. To this end, this method uses the Fourier transform algorithm to calculate the time-frequency distribution of the vibration function of the specified amplitude spectrum according to the vibration step, so as to clarify the spectral amplitude distribution characteristics of each vibration signal as the fixed mutation boundary is deformed under the influence of the vibration step, thereby indirectly clarifying the deformation amplitude of the core box boundary. To more accurately visualize the deformation of the core box boundary from the initial boundary unaffected by the vibration signal to the final boundary affected by the vibration factor, this method defines a segmentation rule for each fixed mutation boundary deformation caused by the vibration signal based on the spectral amplitude distribution characteristics. Each local deformation coordinate point is constructed to reach the midpoint boundary between adjacent local deformation coordinate points, thereby generating a deformation perpendicular bisector for each pair of adjacent local deformation coordinate points. The deformation perpendicular bisector divides the final boundary space affected by the vibration factor into two parts: one closer to the local deformation coordinate point and one closer to the adjacent local deformation coordinate point. The local deformation coordinate point serves as the location data for the final boundary, clarifying the area controlled by each local deformation coordinate point. The influence and jurisdiction between each pair of local deformation coordinate points is determined, visually forming a seesaw between each pair of coordinate points. The median line can equalize the influence of the gradual deformation of the coordinate points, making the deformation amplitude display more detailed and reducing the deformation perception error during the simulation process.

[0067] It should be noted that, by subsequently splicing the common areas where the deformation perpendicular bisectors of the local deformation coordinate point pairs intersect each other, a deformation fixed polygon after the boundary deformation is terminated can be generated. The deformation fixed polygon is the final state of the core box boundary deformation under the influence of vibration. At this time, each local initial coordinate point is interpolated in the deformation fixed polygon to adjust its own structure. The local initial coordinate point is the specific site data of the core box boundary before it is affected by vibration, so as to construct the starting fixed polygon of the core box boundary before it is affected by vibration, and the deformation amplitude between the starting fixed polygon and the deformation fixed polygon is the fixed polygon. The fixed pressure plate requires optimization and elimination of objects, but directly using the calculated polygon area difference may result in some distortion in the displayed details. Therefore, this method extracts the natural deformation neighbor points adjacent to each local deformation coordinate point in the initial fixed polygon after structural adjustment. These natural deformation neighbors measure the influence of the change between the local deformation coordinate point and the nearest local initial coordinate point. Therefore, the deformation amplitude of each local deformation coordinate point to its corresponding natural deformation neighbor point can be determined based on the area difference between the deformed fixed polygon and the initial fixed polygon, avoiding the deformation display error caused by using distant points. Finally, the fixing parameters of each optimized fixing point are optimized based on the deformation amplitude to eliminate the vibration deformation of the core box. This method can visualize the gradual deformation of the casting sand core box boundary from the start to the end of vibration during the simulation, thereby rationally optimizing the fixing performance of the core box fixture. Compared with traditional fixing equipment, it significantly improves the seismic resistance and stability of the casting core making process, enables operators to more accurately adjust the fixing of the core box fixture, and ensures the quality of the casting workpiece.

[0068] The above description of the preferred embodiments of the present invention is provided as a guide, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A method for optimizing the fixing of a core box fixing device for casting core making, wherein the core box fixing device comprises a core box fixing mechanism, characterized in that: The core box fixing mechanism includes a fixed clamping workpiece, which is welded with four long steel plates to form a rectangular steel plate frame with a hollow structure. The side of the fixed clamping workpiece is welded with stabilizing legs. Two stabilizing legs are installed on each side of the fixed clamping workpiece to form a four-legged fixed support structure. A hanger is welded on the other side of the fixed clamping workpiece, and four hangers are provided and distributed near each of the stabilizing legs, so that the four hangers are symmetrical in pairs; Each of the lifting handles has the same appearance and is in the shape of a sickle, and is used for lifting and positioning the fixing device and the multiple core box fixing mechanisms; The fixed optimization method comprises the following steps: Obtain target process specification parameters of the casting sand core box, and simultaneously obtain a preset fixing strategy of the core box fixing device determined based on the target process specification parameters; The original fixing parameters of the core box fixture for the casting sand core box are extracted through a preset fixing strategy. The target process specification parameters are defined according to the original fixing parameters to establish a simulation model of the core box fixture clamping the casting sand core box. Constructing a series of vibration signals, performing vibration fixed simulation by injecting the series of vibration signals into a fixed simulation model, recording morphological data of the casting sand core box during the simulation process, and obtaining simulated fixed mutation boundaries of abnormal morphology of the casting sand core box under vibration environment conditions; Obtain the spatially fixed distribution points of the core box fixture for the casting sand core box and the reference fixed size of each spatially fixed distribution point, preset the fixed offset coverage volume of each spatially fixed distribution point according to the reference fixed size, and divide the three-dimensional model of the casting sand core box in the simulation state of the core box fixture clamping into several coverage box blocks based on the coverage volume; Create a dimension statistics empty stack with the covering volume as the bounding constraint. If at least one edge of the covering box block overlaps with the simulated fixed mutation boundary, mark the covering box block as a non-empty box and store it in the dimension statistics empty stack. Obtain the logarithm of the non-empty box deformation law generated by the fixed mutation boundary caused by the vibration environment. A logarithmic coordinate system is constructed, and the logarithm of the deformation law of the non-empty box is linearly fitted through the logarithmic coordinate system to obtain the peak value of the deformation law curve of each cover box block. Only the spatial fixed distribution points corresponding to the cover box blocks whose fixed deformation law curve peak value is greater than the preset peak value are extracted and calibrated as fixed points to be optimized.

2. A method for optimizing the fixing of a core box fixing device for casting core making according to claim 1, characterized in that: Each side surface of the fixed clamping workpiece is provided with a plurality of circular through holes with the same aperture, and the plurality of circular through holes on the side surface of each fixed clamping workpiece are arranged in a line in a transverse array.

3. A method for optimizing the fixing of a core box fixing device for casting core making according to claim 2, characterized in that: A metal nut is welded inside the circular through hole to form an adjustable fastening structure.

4. A method for optimizing the fixing of a core box fixing device for casting core making according to claim 3, characterized in that: Each of the metal nuts is threadedly connected to a screw rod, and a fixed pressing plate is welded to the front end of the screw rod.

5. A method for optimizing the fixing of a core box fixing device for casting core making according to claim 4, characterized in that: The fixed pressing plate is a rectangular steel plate, and the fixed pressing plate is moved forward to support and clamp the casting sand core box by adjusting the screw.

6. The method for optimizing the fixing of a core box fixing device for casting core making according to claim 1, characterized in that: The fixed pressing plates on both sides of the fixed clamping workpiece form a 90° relative limiting pressure trend to fix the casting sand core box.

7. The method for optimizing the fixing of a core box fixing device for casting core making according to claim 1, characterized in that: The fixing device is composed of three layers of core box fixing mechanisms stacked from bottom to top, and the core box fixing mechanism of the upper layer is spliced ​​with the top of the stabilizing legs of the core box fixing mechanism of the lower layer through the bottom end of the stabilizing legs.

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