An evolvent-imitating spade body and a manufacturing method thereof

Abstract

The application discloses a kind of engineering machinery technology fields of spade excavating, and a manufacturing method of imitating involute spade body, including establishing target constraint model according to the parameter of spade body;According to the target constraint model, the curve discrete model is established, and the involute is dispersed into multiple continuous tangent arc segments;Establish curve parameter model, calculate the discrete curve parameter corresponding to each arc;Establish error iterative correction model, carry out error evaluation and iterative correction to discrete curve, obtain the discrete curve parameter satisfying preset error requirement;According to the discrete curve parameter, generate numerical control processing parameter, and control rolling equipment to complete the rolling forming of the component of imitating involute spade body;The application realizes the connection between involute and rolling processing technology, can convert continuous variable-curvature curve into executable processing track, while ensuring curve fitting accuracy, improves the processing and manufacturing efficiency of complex curve.

Description

Technical Field

[0001] This invention relates to a simulated involute blade body and its manufacturing method, belonging to the technical field of excavating engineering machinery. Background Technology

[0002] Bulldozers and graders are excavating construction machinery with a blade as the main body, equipped with various other interchangeable working devices, used for pushing, leveling, and trimming bulk materials. They are mainly used in road construction, airport leveling, and large-area media leveling, slope scraping, ditch digging, bulldozing, loosening soil, and snow removal, and are one of the important pieces of equipment for infrastructure construction. With the increasing application of ultra-large graders in heavy-duty pushing and shoveling operations involving large volumes of bulk materials, the need to improve the blade structure design has resulted in poor digging performance during heavy-duty operations. This is mainly manifested in the following aspects: a fixed digging angle leads to high digging resistance; unsuitable digging posture causes bulk materials to roll a short distance and are difficult to expel in a timely manner; and inaccurate control of digging depth leads to frequent tire slippage, resulting in a serious imbalance in the system's power output within the high-efficiency range.

[0003] The prior art discloses a bulldozer blade with a contact surface, an upper end surface, a lower end surface and a rear end surface. The contact surface is a curved surface formed by a single arc. The contact surface and the rear end surface are arranged opposite to each other. The upper end surface is horizontally arranged between the top of the contact surface and the top of the rear end surface. The lower end surface is inclined between the bottom of the contact surface and the bottom of the rear end surface. The lower end surface is inclined in the horizontal direction.

[0004] The existing technology has at least the following defects and shortcomings: Due to the complex working conditions of grader digging, the existing single-section arc-shaped blade body can hardly achieve the leveling operation of small earthwork volumes through posture adjustment. At the same time, it can also take into account the function of increasing adhesion due to the downward load of the medium on the blade surface during heavy-duty digging operations. The traditional single-radius arc-shaped blade body can no longer achieve the optimal combination range of soil entry angle, soil turning angle and digging operation angle at the same time, resulting in high digging resistance, short soil turning distance, low digging efficiency and easy slippage.

[0005] The existing patent application with application number 201710567874.9, entitled "Shovel Body, Digging System and Grader", has optimized the structure of the existing shovel body to ensure that its soil entry angle, soil turning angle and digging operation angle can simultaneously meet the requirements of the proposed optimal range of use. However, the shovel body is composed of a shovel blade and at least two spliced ​​arc plates bolted and welded together. The shovel blade and the arc plates are processed separately. The welding process requires precise tooling and fixtures, and there is the phenomenon of thermal expansion and contraction deformation after welding. Therefore, it is difficult to ensure that a smooth transition arc surface splicing is formed, and that the entry angle, turning angle, and digging angle range can be precisely controlled. This results in inevitable fluctuations in the optimal angle range during the manufacturing process. Moreover, the shovel body made by this splicing and welding method cannot achieve an infinite approximation of the involute shovel body surface. The existing welding method is a compromise manufacturing method proposed to ensure the range and combination of entry angle, turning angle, and digging angle. However, its defects are obvious. It does not truly achieve the function of imitating the involute surface. It only has a similar arc surface shape. Summary of the Invention

[0006] In order to overcome the problem in the existing technology that it is difficult to accurately convert the involute surface that meets the requirements of digging performance into a pseudo-involute surface that can be processed by rolling equipment, resulting in insufficient forming accuracy and manufacturing consistency of the blade body, the present invention provides a pseudo-involute blade body and its manufacturing method.

[0007] Firstly, a method for manufacturing a simulated involute spade body is provided, including:

[0008] Establish a target constraint model for the blade body, determine the target constraint parameters based on the target operational performance of the blade body, and determine the target involute curve based on the target constraint parameters;

[0009] The target involute is divided into multiple continuous curve segments using a segmented approach. The corresponding curve segments are then fitted with sequentially tangent circular arcs to form a pseudo-involute.

[0010] Establish geometric constraints between adjacent circular arcs, and solve for curve parameters based on the geometric constraints.

[0011] The error between the simulated involute and the target involute is evaluated. When the error is greater than the preset error, the curve segment is re-discreteed and the curve parameters are recalculated until the preset error requirement is met.

[0012] Numerical control (NC) machining parameters are generated based on all curve parameters that meet the error requirements. The rolling mill is then controlled according to the NC machining parameters to complete the rolling forming of the components of the involute-shaped scraper body. The components are then spliced ​​together to obtain the involute-shaped scraper body.

[0013] Furthermore, the target constraint parameters include:

[0014] burial angle Angle of turning soil , digging angle And the chord length L of the shovel body;

[0015] Among them, the soil entry angle The soil turning angle is set between 31 and 33°. The digging angle is set between 38 and 40 degrees. The angle is set between -5° and -10°, and the chord length L of the shovel body is set between 600 and 620 mm.

[0016] Furthermore, establishing the geometric constraint relationship between adjacent arcs and solving the curve parameters based on the geometric constraint relationship includes:

[0017] When the target involute is initially divided into two continuous curve segments, the two continuous curve segments are fitted by the first arc and the second arc respectively. The first arc is tangent to the second arc, and the centers of the first arc and the second arc are on the same horizontal line.

[0018] The first and second circular arcs satisfy the following geometric constraints:

[0019] ;

[0020] Solution to the equation:

[0021] ;

[0022] in Let be the radius of the first arc. Let be the radius of the second arc.

[0023] Furthermore, the horizontal distance between the center of the first arc and the starting point of the bottom of the shovel surface and vertical distance and the horizontal distance between the center of the first arc and the center of the second arc. satisfy:

[0024] .

[0025] Furthermore, the curve parameters include: the radius of each arc, the position of the center of each arc, and the position of the arc connection point.

[0026] Furthermore, the error evaluation between the simulated involute and the target involute includes:

[0027] Using the target involute as the initial curve segment, perform circular arc fitting on the initial curve segment until the fitting error of all curve segments is less than or equal to the preset error;

[0028] When the fitting error of any curve segment is greater than the preset error, the curve segment is re-discretized and the curve parameters are recalculated.

[0029] Furthermore, re-discretizing the curve segment and re-calculating the curve parameters includes: dividing the curve segment with a value greater than the preset error into two continuous sub-curve segments, and fitting the two sub-curve segments with circular arcs respectively.

[0030] Furthermore, CNC machining parameters are generated based on all curve parameters that meet the error requirements, including:

[0031] The positions of each arc connection point are converted into absolute coordinates, and each arc connection point is used as a rolling node. The arc radius of each arc is combined with the corresponding rolling node to form CNC machining parameters.

[0032] In a second aspect, a simulated involute scraper body is provided, which is obtained by the simulated involute scraper body manufacturing method as described in the first aspect, wherein the constituent components include a scraper blade and an arc plate.

[0033] The shovel blade and the arc plate are joined at the dividing edge. The arc plate includes at least two arc surfaces with different radii. The shovel blade and the arc plate form a shovel surface by a pseudo-involute arc transition.

[0034] This invention establishes a target operation constraint model, using target curve parameters as the design basis, and establishes a curve discretization model to discretize the theoretical involute into multiple continuous tangent arc segments. Then, the curve parameter model is used to solve for the discrete curve parameters corresponding to each arc. Combined with an error iteration correction model, the discrete curve is evaluated and iteratively corrected to ensure that the discrete curve can approximate the target involute while meeting the preset error requirements. Finally, the discrete curve parameters are converted into CNC machining parameters through a machining trajectory generation model, and the rolling equipment is controlled to complete the manufacturing of the scraper body. This realizes the conversion from involute to rolling machining trajectory, enabling traditional rolling equipment to manufacture continuously variable curvature pseudo-involute scraper bodies, improving the feasibility of complex curve machining and curve forming accuracy, and helping to improve the stability, consistency, and repeatability of the machining process. Attached Figure Description

[0035] Figure 1 This is a working logic diagram of the method for manufacturing a simulated involute spade body provided in an embodiment of the present invention;

[0036] Figure 2 This is a structural diagram of the shovel body provided in an embodiment of the present invention;

[0037] Figure 3 This is a diagram showing the state of the shovel body digging the medium, provided in an embodiment of the present invention.

[0038] Figure 4 A schematic diagram of the programming method for calculating the arc surface of the shovel body provided in an embodiment of the present invention;

[0039] Figure 5 This is a reasoning diagram for the programming method of drawing the arc surface of the shovel body provided in an embodiment of the present invention;

[0040] Figure 6 This is a reasoning diagram for the method of obtaining arc surface parameters provided in Embodiment 3 of the present invention.

[0041] Figure label:

[0042] 1. Shovel blade; 2. Arc plate; 3. Connector; 4. Back plate. Detailed Implementation

[0043] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0044] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0045] Example 1:

[0046] like Figure 1 As shown, this embodiment provides a method for manufacturing a simulated involute scraper body, including:

[0047] Establish a target constraint model for the blade body, determine the target constraint parameters based on the target operational performance of the blade body, and determine the target involute curve based on the target constraint parameters;

[0048] The target involute is divided into multiple continuous curve segments using a segmented approach. The corresponding curve segments are then fitted with sequentially tangent circular arcs to form a pseudo-involute.

[0049] Establish geometric constraints between adjacent circular arcs, and solve for curve parameters based on the geometric constraints.

[0050] The error between the simulated involute and the target involute is evaluated. When the error is greater than the preset error, the curve segment is re-discreteed and the curve parameters are recalculated until the preset error requirement is met.

[0051] Numerical control (NC) machining parameters are generated based on all curve parameters that meet the error requirements. The rolling mill is then controlled according to the NC machining parameters to complete the rolling forming of the components of the involute-shaped scraper body. The components are then spliced ​​together to obtain the involute-shaped scraper body.

[0052] The discretization model of the target curve based on the target constraint parameters includes: dividing the target curve into multiple continuous curve segments, and fitting the corresponding curve segments with multiple continuous tangent circular arcs to construct an involute-like curve.

[0053] Specifically, such as Figure 2 and Figure 3 As shown, the dividing lines of the shovel blade 1 and the arc plate 2 are selected and determined according to the processing technology and the requirements of heat treatment; the target constraint parameters include: the soil penetration angle. Angle of turning soil , digging angle And the chord length L of the shovel body; wherein, the soil entry angle The soil turning angle is set between 31 and 33°. The digging angle is set between 38 and 40 degrees. The angle is set between -5° and -10°, and the chord length L of the shovel body is set between 600 and 620 mm.

[0054] Obtaining the curve parameters corresponding to each arc based on the discretized model includes: establishing the geometric constraint relationship between each arc, and solving the curve parameters corresponding to each arc based on the geometric constraint relationship between each arc; the curve parameters include: the radius of each arc, the position of the center of each arc, and the position of the arc connection point. Among these, the soil penetration angle refers to the angle between the tangent of the lowest arc structure of the shovel blade 1 and the horizontal direction, which indicates the wedge angle at which the lowest end of the shovel digs the working medium; the soil turning angle refers to the angle between the tangent of the highest arc structure of the shovel blade and the horizontal direction, and its value directly affects the rolling distance of the digging medium (material); the digging angle refers to the angle between the chord of the shovel blade's arc structure and the vertical direction, which directly relates to the direction and magnitude of the vertical force exerted by the digging medium on the shovel body during heavy-duty digging operations.

[0055] like Figure 4 and Figure 5 As shown, in order to obtain Figure 4 The simulated involute arc shape and angle shown are first selected to satisfy the overall parameters α, β, and the involute arc segment required by L, according to Figure 3Divide the similar involute contour into two segments and obtain the corresponding arcs for each segment. and arc Two segments, and the parameters corresponding to each segment. , , and , , , And L2, etc., then the arc and arc Segment again to obtain the corresponding parameters. , , and L3, , , And L4, of course, each selection of the segmentation point requires least squares error calculation with the arc segment corresponding to the selected involute. If it is within the error range, it is accepted; if it is outside the error range, the segmentation point is adjusted. The computer program simulates it to make it conform to the error range. The inverse segmentation method is used to iterate the arc segment to approximate the involute arc segment multiple times. When it meets the error range, the arc segment does not need to be segmented again; if it does not meet the error range, it is segmented again until the segmentation iteration meets the error range and no further segmentation is needed. The corresponding parameter values ​​are obtained respectively. , , and L1... , , and These parameters are then saved as input control parameters for CNC machine tool processing.

[0056] in, , , and The soil turning angle, digging angle, soil entry angle, and blade chord length correspond to the first arc segment. , , L2 represents the soil turning angle, digging angle, soil entry angle, and blade chord length corresponding to the second arc segment; , , L3 represents the soil turning angle, digging angle, soil entry angle, and blade chord length corresponding to the third arc segment. , , L4 represents the soil turning angle, digging angle, soil entry angle, and blade chord length corresponding to the fourth arc segment; , , and Let N be the soil turning angle, digging angle, soil entry angle, and blade chord length corresponding to the Nth arc segment.

[0057] Each arc segment can be calculated based on the parameter values ​​required for the corresponding involute segment, and the corresponding relationship is as follows:

[0058] ; ;

[0059] ;

[0060] In the formula, …R 2N R represents the radius corresponding to the first arc segment, ..., the radius corresponding to the second Nth arc segment. b This represents the base circle radius of the target involute; that is... Represented as: the radial distance from the i-th selected point on the involute, with the base circle of the involute as the reference. , determined by the base circle radius The corresponding soil turning angle Sure.

[0061] By obtaining the corresponding parameters, the corresponding equation can be used to calculate the corresponding result. , , , , …… , , ,in, , , These are the horizontal and vertical distances from the center of the Nth arc to the starting point of the first arc, and the horizontal distance from the center of the Nth arc to the center of the (N-1)th arc. Based on these parameters, the corresponding accurate involute arc can be drawn, thereby enabling the processing and manufacturing of the involute shovel body.

[0062] like Figure 4 As shown, the simulated involute curve is drawn using only the bottom to top of the spatula, including the arc. and arc In the two-segment simplified analysis, the arc The radius is arc The radius is The two arcs in If the two arcs are tangent at points, their centers lie on the horizontal line. superior, The center of the circle is , The center of the circle is , The horizontal distance to point A is , The vertical distance to point A is , , The distance between them is , , The following relationship exists between them:

[0063] ;

[0064] Solution to the equation:

[0065] ;

[0066] at the same time:

[0067] .

[0068] like Figure 4 As shown in the figure, in one specific embodiment, , , , , The mathematical model can be used to obtain the following results after selecting a combination of angles and chord lengths, such as when α = 39°, β = -8°. When the angle is 32° and the corresponding chord length L = 610 mm, the corresponding... , , , , To determine the specific values, after identifying the position of point A on the horizontal plane, draw a horizontal line AU to the left, and let AU = ,make The perpendicular distance to AU is ,Pass Draw a straight line parallel to AU, that is, the corresponding ∠ = ,exist The corresponding above Horizontal cut-off length to the right The following is the corresponding Points, respectively , ,by , Draw arcs with radius , such that they intersect at . Tangent point, where , They pass through points A and D respectively. The perpendicular lines intersect at point A and D, AG and DH are the radial lines of the arc passing through points A and D, AE and DF are the tangent lines, and DT is the horizontal line passing through point D. Let α be the soil entry angle of the blade body; β be the soil turning angle; and L be the chord length of the blade body, thus determining the arc surface of the blade face. .

[0069] The arc plate 2 body and blade 1 required for the corresponding shovel body are obtained by one roll forming process. It can ensure that the shovel surface formed by CNC programming is infinitely close to the involute curve, and has the functions and effects of the involute shovel body. It can also effectively avoid the high cost of adding a large-tonnage forming press and die casting mold, and effectively solve the difficult problems of processing and manufacturing the imitation involute shovel body and its application in engineering practice.

[0070] In one specific implementation, the required combination parameters and the required range are programmed and input on the CNC equipment. The error judgment range is set by the program to determine the arc surface parameters for forming the scraper surface. After smooth transition and connection by using arc segment adjustment, the overall arc surface infinitely approximates the curve corresponding to the involute. The computer program judges and automatically adjusts the arc surface of the imitation involute scraper body required for one-time roll forming.

[0071] Example 2:

[0072] Based on Example 1, we obtained Figure 4 The simulated involute arc shape and angle shown are first selected to satisfy the overall parameters α, β, and the involute arc segment required by L, according to Figure 4 Divide the similar involute contour into two segments and obtain the corresponding arcs for each segment. and arc Two sections; such as Figure 5 As shown, then the arc Divide the data again to obtain the parameters corresponding to each segment. , , and L1, , , And L2, etc., the specific methods for evolving from 2-segment circular arcs into 3-segment circular arcs (circular arcs) If necessary, further segmentation can be performed using a similar method.

[0073] like Figure 5 As shown, firstly Rotate counterclockwise around point A by a small angle ( - ) make When the point reaches a new location, it will Move downwards in a straight line a certain distance to Position (such as intersecting) The point should satisfy the following characteristics: arc and Intersecting The tangent to the arc at the point is the vertical line. You can definitely find a point here, Center For radius and Intersect at The arc of the point (where) The point must satisfy the following characteristics, passing through The tangent to the arc at the point is a vertical line, and its distance is... Keep it within a small range of values, while making arc segment and The error was controlled within 5% by using the least squares method.

[0074] Similarly, we can find a point such that... Center For radius and Intersect at An arc from a point, making its distance Keep it within a small range of values, while making arc segment and The error was controlled within 5% by using the least squares method.

[0075] The above segmentation is derived by reverse engineering using a mathematical model to obtain its corresponding accurate value. Furthermore, the horizontal distance from point M1 to point A can be calculated using angle measurements and formulas. The perpendicular distance from point M1 to point A is The distance between two adjacent center points is By taking the radius R3 of arc AP1 and the radius R4 of arc P1P0 as the key parameters and the corresponding points as the center, the transition point of the arc can be found, and the corresponding accurate imitation involute arc can be drawn, thus enabling the processing and manufacturing of the imitation involute shovel body.

[0076] This embodiment also provides the coordinate transformation equation of point P0 around point A:

[0077] Assuming point A's coordinates are (0, 0), rotate counterclockwise by an angle... - After rotation New coordinates ( , The rotation matrix R around point A is expressed as follows:

[0078] ;

[0079] The relative coordinates of the point after rotation are:

[0080] ;

[0081] After unfolding, translate back to the original coordinate system The corresponding coordinates are:

[0082] ;

[0083] All of the above newly acquired , … The new coordinate positions of the transition points of the circular arcs can be obtained by performing the coordinate transformation described above, and at the same time, the following can be obtained: , Its coordinate position point after translation corresponds to other parameters , , and L1, , , And L2, etc., thereby obtaining the corresponding , , , , These values ​​are used as absolute coordinate values ​​for input into the CNC program, and then substituted into the corresponding CNC program for a rolling process.

[0084] Each time a division point is selected, the least squares error is calculated between the selected involute arc segment and the corresponding arc segment. If the error is within the range, it is accepted; if it is outside the range, the division point is adjusted and simulated by a computer program to make it conform to the error range. The inverse division method is used to make the arc segment approximate the involute arc segment multiple times. When the error range is met, the arc segment does not need to be divided again. If the error range is not met, it is divided again until the division iteration reaches the error range and no further division is needed.

[0085] Example 3:

[0086] like Figure 6 As shown, this embodiment also provides an innovative method for obtaining arc surface parameters through drawing programming, which is applicable to the method of automatically drawing corresponding prototype drawings of the shovel body during mechanical design. The corresponding automatic drawing reasoning steps are as follows:

[0087] (1) Draw a horizontal line AB and a vertical line AC; draw an inclined line segment AD of length L through point A, ensuring that ∠DAC=β.

[0088] (2) Draw a diagonal line AE through point A, ensuring that ∠BAE = Draw a diagonal line DF through point D, ensuring that the angle between DF and the horizontal line is α.

[0089] (3) Draw a perpendicular line AG from point A to AE; draw a perpendicular line DH from point D to DF.

[0090] (4) Draw a horizontal line JK in the middle of AD. JK intersects AG at point M and DH at point N.

[0091] (5) Draw an arc with point M as the center and AM as the radius. The arc intersects JK at point P.

[0092] (6) Draw an arc with N as the center and PN as the radius. The arc intersects DH at point D′.

[0093] The length of DD′ represents the allowable error range for the automatically drawn design. If the length of DD′ meets the design requirements, then arcs AP and PD′ constitute the arc surface of the shovel body to be designed; if the length of DD′ does not meet the design requirements, then the horizontal line JK is moved to... Figure 6 At position J′K′, repeat steps (4), (5), and (6) until the above-mentioned allowable error range requirement is met. The above-mentioned graphical reasoning method can be implemented by computer programming in the machining and manufacturing process of the shovel body.

[0094] Based on the final three-angle optimization combination range and chord length requirements, the soil entry angle of the shovel body at the starting point of the arc meets the required range. The corresponding blade arc must also meet the requirements of an involute curve, preferably composed of an involute segment and several subsequent continuous segments. The dividing point of the shovel blade 1 and the arc plate 2 for one-time roll forming is selected and determined. The specific parameter values ​​of this dividing point can be flexibly adjusted according to the blade processing process that meets the requirements of several continuous segments of the involute curve and the specific structural size arrangement requirements of the blade and arc for disassembly and connection (e.g., when the soil entry angle needs to change a large range, the blade width needs to be increased, and when the change range is small, the size can be shortened). The shovel blade 1 and the arc plate 2 are rolled in stages using the same arc surface parameters of the shovel surface formed by CNC programming.

[0095] The scraper blade 1 and the arc plate 2 are integrally rolled and formed using arc surface parameters, and then cut at the dividing line to form the scraper blade 1 and the arc plate 2; or the scraper blade 1 and the arc plate 2 are rolled and formed separately using the same arc surface parameters of the scraper surface generated by programming (because the wear resistance, hardness and aging acceleration of the blade need to be treated after rolling, the rolled plate is first divided into two parts, the blade and the arc plate 2, and rolled and formed in one step on a CNC machine tool using a program set by the fixture). For the original fixed radius rolling processing manufacturing method, the involute equation is cleverly transformed into an infinitely approximating programmable continuous solution of the involute by establishing a mathematical model (or graphical method), and the computer programming automatically judges that the pseudo-involute arc surface is infinitely close to the involute, and further transforms it into a CNC machine tool program to realize the processing and manufacturing of the scraper body and the blade by one-step rolling.

[0096] Considering the severe wear and frequent replacement of the blade part of the shovel body, the shovel blade 1 part also requires subsequent special processing technology and tempering treatment (such as: wear-resistant coating additive manufacturing, blade anti-rolling hardness adjustment, blade stress aging accelerated treatment, etc.), as well as the fusion of the material body and coating and the plasticity of the reprocessing technology. Only by effectively solving the many difficult problems in the use of the blade can the use cost of the imitation involute shovel blade 1 be significantly reduced and its service life extended.

[0097] Therefore, it is necessary to consider dividing the single-roll-formed spade blade 1 and the arc portion of the spade into two sections for subsequent processing, heat treatment, and other processes. This involves using a unified CNC program and assembly line operation to process the required parameters for the spade blade 1 and arc plate 2 (where the blade and arc plate 2 are rolled in one step according to a simulated involute curve program, or the start and end points can be set using the simulated involute curve program to process the corresponding blade and arc plate 2 separately). By applying CNC machining technology and rolling manufacturing methods with automatic radius adjustment at multiple nodes, the CNC programming required for the single-roll-forming of the spade blade 1 and arc plate 2 is completed. This improves the processing technology and innovates the manufacturing method of the simulated involute spade body, thereby enabling continuous, efficient, and rapid processing and manufacturing of the simulated involute spade body.

[0098] Example 4:

[0099] like Figure 2 and Figure 3 As shown, this embodiment provides a simulated involute scraper body, which is obtained by the simulated involute scraper body manufacturing method described in Embodiment 1, wherein the constituent components include a scraper blade 1 and an arc plate 2;

[0100] The shovel blade 1 and the arc plate 2 are joined at the dividing edge. The arc plate 2 includes at least two arc surfaces with different radii. The shovel blade 1 and the arc plate 2 form a shovel surface by a simulated involute arc transition.

[0101] The angle of the shovel blade into the soil Between 31 and 33 degrees; the turning angle α is between 38 and 40 degrees; the digging angle β is between -5 and -10 degrees; and the blade body chord length L is between 600 mm and 620 mm.

[0102] The back of the arc plate 2 is fixed with a back plate 4, and the shovel blade 1 is detachably connected to the back plate 4 by bolting.

[0103] The simulated involute scraper body also includes a connector 3. The arc plate 2 is installed on the connector 3. The connector 3 is used to connect with the corner positioner. The connector 3 can drive the arc plate 2 to slide relative to the corner positioner.

[0104] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0105] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for manufacturing a simulated involute spade body, characterized in that, include: Establish a target constraint model for the blade body, determine the target constraint parameters based on the target operational performance of the blade body, and determine the target involute curve based on the target constraint parameters; The target involute is divided into multiple continuous curve segments using a segmented approach. The corresponding curve segments are then fitted with sequentially tangent circular arcs to form a pseudo-involute. Establish geometric constraints between adjacent circular arcs, and solve for curve parameters based on the geometric constraints. The error between the simulated involute and the target involute is evaluated. When the error is greater than the preset error, the curve segment is re-discreteed and the curve parameters are recalculated until the preset error requirement is met. Numerical control (NC) machining parameters are generated based on all curve parameters that meet the error requirements. The rolling mill is then controlled according to the NC machining parameters to complete the rolling forming of the components of the involute-shaped scraper body. The components are then spliced ​​together to obtain the involute-shaped scraper body.

2. The method for manufacturing a simulated involute scraper body according to claim 1, characterized in that, The target constraint parameters include: burial angle Angle of turning soil , digging angle And the chord length L of the shovel body; Among them, the soil entry angle The soil turning angle is set between 31 and 33°. The digging angle is set between 38 and 40 degrees. The angle is set between -5° and -10°, and the chord length L of the shovel body is set between 600 and 620 mm.

3. The method for manufacturing a simulated involute scraper body according to claim 2, characterized in that, The process of establishing geometric constraints between adjacent arcs and solving for curve parameters based on these geometric constraints includes: When the target involute is initially divided into two continuous curve segments, the two continuous curve segments are fitted by the first arc and the second arc respectively. The first arc is tangent to the second arc, and the centers of the first arc and the second arc are on the same horizontal line. The first and second circular arcs satisfy the following geometric constraints: ； Solution to the equation: ； in Let be the radius of the first arc. Let be the radius of the second arc.

4. The method for manufacturing a simulated involute spade body according to claim 3, characterized in that, The horizontal distance between the center of the first arc and the starting point of the bottom of the scraper surface and vertical distance and the horizontal distance between the center of the first arc and the center of the second arc. satisfy: 。 5. The method for manufacturing a simulated involute spade body according to claim 1, characterized in that, The curve parameters include: the radius of each arc, the position of the center of each arc, and the position of the connection point of the arc.

6. The method for manufacturing a simulated involute spade body according to claim 1, characterized in that, The error evaluation between the simulated involute and the target involute includes: Using the target involute as the initial curve segment, perform circular arc fitting on the initial curve segment until the fitting error of all curve segments is less than or equal to the preset error; When the fitting error of any curve segment is greater than the preset error, the curve segment is re-discretized and the curve parameters are recalculated.

7. The method for manufacturing a simulated involute scraper body according to claim 6, characterized in that, The process of re-discretizing the curve segment and re-calculating the curve parameters includes: dividing the curve segment with a value greater than the preset error into two continuous sub-curve segments, and fitting the two sub-curve segments with circular arcs respectively.

8. The method for manufacturing a simulated involute spade body according to claim 1, characterized in that, Generate CNC machining parameters based on all curve parameters that meet the error requirements, including: The positions of each arc connection point are converted into absolute coordinates, and each arc connection point is used as a rolling node. The arc radius of each arc is combined with the corresponding rolling node to form CNC machining parameters.

9. A simulated involute scraper body, characterized in that, The method for manufacturing a simulated involute scraper body as described in any one of claims 1-8 is adopted, wherein the constituent components include a scraper blade (1) and an arc plate (2). The shovel blade (1) and the arc plate (2) are joined at the dividing edge. The arc plate (2) includes at least two arc surfaces with different radii. The shovel blade (1) and the arc plate (2) form a shovel surface by a simulated involute arc transition.

Images