Method for parametric creation of a suspension wedge

Abstract

The present application relates to the field of modeling of wedge, in order to improve the modeling efficiency, provide the method for parameterized creation of suspension wedge, including: step 1, input 8 modeling parameters;Step 2, the stamping coordinate system of wedge is established by coordinate transformation;Step 3, the wedge section is created in the stamping coordinate system of wedge based on modeling parameters;Step 4, the three-dimensional wedge main structure is obtained by stretching and shell drawing commands to the wedge section;Step 5, the modeling parameters of wedge section are associated with the corresponding standard parts.The above steps significantly improve the generation and post-optimization efficiency of wedge.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cam modeling, and particularly relates to a method for parameterized creation of a suspension cam. BACKGROUND

[0002] In the structural design process of an automobile die, when a standard cam cannot meet the forming work requirements in the side forming process of the inner and outer panels of a door, a roof, and a hood, a self-made suspension cam needs to be designed for the side sizing, side flanging, side trimming, and side punching of a product, which accounts for a large proportion in the structural design work. Since the size design of the suspension cam has an important influence on the assembly size and constraints around the die, a change in one parameter can cause changes in the positional relationship of a die holder, a material presser, and a guide device. The self-made suspension cam currently using an interactive parameter-driven design has a design principle of selecting a driving parameter based on experience, which can be used for actual parameterized structure generation, but the input size is obtained through a trial-and-error method, and the structure can be automatically generated only when the input size meets the topological relationship, so the modeling efficiency is low, and sometimes the generated structure has defects in structural strength, rigidity, and stability. SUMMARY

[0003] In order to improve the modeling efficiency, the present application provides a method for parameterized creation of a suspension cam.

[0004] The present application solves the above problems by using the following technical scheme:

[0005] The method for parameterized creation of a suspension cam comprises the following steps:

[0006] Step 1: input modeling parameters, wherein the modeling parameters comprise: alpha, theta, H, Ld, Lw, Lb, Lbk, and Ls, wherein alpha represents a punching angle of the cam, theta represents a plane angle of the cam, H represents a distance from a cam base plane to an origin of a cam punching coordinate system, Ld represents a driving length of the cam, Lw represents a working width of the cam, Lb represents a length of a top plane of the base, Lbk represents a length of a rear part of the base, and Ls represents a side forming size of the cam;

[0007] Step 2: establish a cam punching coordinate system (alpha, theta, x0, y0, z0) through coordinate transformation;

[0008] Step 3: create a cam section in the cam punching coordinate system (alpha, theta, x0, y0, z0) based on alpha, theta, H, Ld, Lw, Lb, and Lbk;

[0009] Step 4: stretch and shell the cam section according to Ls to obtain a three-dimensional cam main structure.

[0010] Further, the step 2 is specifically as follows:

[0011] The mold coordinate system is denoted as Axis1, and the intermediate conversion coordinate system is denoted as Axis2, which is composed of the origin of the mold coordinate system plus a set of bases of the inclined wedge stamping coordinate system, and the set of bases is expressed as: (sin 2 αcosθ,-sinαsinθ,cosαcosθ), (sin 2 αsinθ,sinαcosθ,cosαsinθ), (-sinαcosα,0,sinα);

[0012] The origin coordinate (x0, y0, z0) of the inclined wedge stamping coordinate system is the intersection point of the bottom plane of the insert mounted on the inclined wedge, the back surface, and the YZ plane of the intermediate conversion coordinate system Axis2;

[0013] The origin coordinate (x0, y0, z0) of the inclined wedge stamping coordinate system is converted to the coordinate value (x1, y1, z1) of the inclined wedge origin in the mold coordinate system Axis1 through a coordinate conversion formula;

[0014] Adjust (x0, y0, z0) to make (x1, y1, z1) an integer, then determine (x0, y0, z0); the inclined wedge stamping coordinate system is composed of a set of bases of the inclined wedge stamping coordinate system plus the origin coordinate (x0, y0, z0) of the inclined wedge;

[0015] The coordinate conversion formula is:

[0016] Further, it further comprises step 5, assembling standard parts on the three-dimensional inclined wedge main body structure.

[0017] Further, the standard parts include: top surface guide plate, safety screw, shaped insert, side surface guide plate, side surface pressing plate, forced reset plate, driving guide plate, and buffer stopper.

[0018] Further, it further comprises step 6, standard part information association:

[0019] Record the modeling parameters of the three-dimensional inclined wedge main body structure and the origin coordinate of the inclined wedge stamping coordinate system related to the standard parts, denoted as information P;

[0020] After the standard part assembly is completed, record the external reference feature A associated with information P P , A P contains the model number, installation position, quantity, distribution spacing, and reference reference point of the standard part.

[0021] Further, when information P is updated, the information in A P is updated synchronously in the order of reference reference point, distribution spacing, installation position, quantity, and model number, thereby generating a new standard part.

[0022] The present application has the beneficial effects compared with the prior art: the method of the present application improves the design and later modification efficiency of the self-made suspension wedge, and reduces the quality accidents such as interference. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Flow chart of the method for creating a suspension wedge by parameterization;

[0024] Figure 2 Schematic diagram of a wedge section;

[0025] Figure 3 Schematic diagram of a three-dimensional wedge main structure;

[0026] Figure 4 Wedge assembly diagram;

[0027] Figure 5 Guide plate adjustment principle diagram;

[0028] BRIEF DESCRIPTION OF DRAWINGS: 1, top guide plate, 2, safety screw, 3, shaped insert, 4, side guide plate, 5, side pressing plate, 6, forced reset plate, 7, driving guide plate, 8, buffer stop. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application clearer and more understandable, the present application will be further described in detail below with examples. It should be understood that the specific examples described here are only used to explain the present application, and are not used to limit the present application.

[0030] As shown in Figure 1 The method for creating a suspension wedge by parameterization comprises:

[0031] Step 1, input modeling parameters, the modeling parameters include: α, θ, H, Ld, Lw, Lb, Lbk and Ls, wherein α represents the punching angle of the wedge; θ represents the plane angle of the wedge, H represents the distance from the wedge base plane to the origin of the wedge punching coordinate system; Ld represents the driving length of the wedge, which determines the stress stability of the wedge in the forming process, and its size can be associated with the installation position and size of the buffer stop and the driving guide plate; Lw represents the working width of the wedge, and its size can be associated with the structure and installation position of the shaped insert; Lb represents the length of the top plane of the base, and its size can be associated with the installation center point, the installation quantity and the distribution distance of the top guide plate and the safety screw; Lbk represents the length of the rear part of the base, which determines the range of the intersection position of the driving force and the forming force, and is used to adjust the stress balance of the wedge, which can be associated with the model selection of the side guide plate, the side pressing plate and the forced reset plate; Ls is the side forming size of the wedge;

[0032] Step 2, establish the inclined wedge stamping coordinate system (α, θ, x0, y0, z0) through coordinate transformation;

[0033] Specifically, the mold coordinate system is denoted as Axis1, and the intermediate conversion coordinate system is denoted as Axis2. The intermediate conversion coordinate system is composed of a set of bases of the inclined wedge stamping coordinate system and the origin of the mold coordinate system, and the set of bases is represented as: (sin 2 αcosθ, -sinαsinθ, cosαcosθ), (sin 2 αsinθ, sinαcosθ, cosαsinθ), (-sinαcosα, 0, sinα);

[0034] The origin coordinate (x0, y0, z0) of the inclined wedge stamping coordinate system is the intersection point of the bottom plane of the insert mounted on the inclined wedge, the back surface, and the YZ plane of the intermediate conversion coordinate system Axis2;

[0035] The origin coordinate (x0, y0, z0) of the inclined wedge stamping coordinate system is converted into the coordinate value (x1, y1, z1) of the origin of the inclined wedge in the mold coordinate system Axis1 through a coordinate conversion formula;

[0036] Adjust (x0, y0, z0) so that (x1, y1, z1) is an integer, then (x0, y0, z0) can be determined. The inclined wedge stamping coordinate system is composed of a set of bases of the inclined wedge stamping coordinate system and the origin coordinate (x0, y0, z0) of the inclined wedge;

[0037] The coordinate conversion formula is:

[0038] Step 3, create an inclined wedge section in the inclined wedge stamping coordinate system (α, θ, x0, y0, z0) based on α, θ, H, Ld, Lw, Lb, and Lbk. The inclined wedge section is as shown in Figure 2 ;

[0039] Step 4, stretch and extract the shell of the inclined wedge section according to Ls to obtain a three-dimensional inclined wedge main structure, as shown in Figure 3 .

[0040] Further, it further includes step 5, assembling standard parts on the three-dimensional inclined wedge main structure. As shown in Figure 4 , the standard parts include: top guide plate 1, safety screw 2, shaped insert 3, side guide plate 4, side pressing plate 5, forced reset plate 6, driving guide plate 7, and buffer stop 8.

[0041] Further, it further includes step 6, standard part information association:

[0042] Record the modeling parameters of the three-dimensional inclined wedge main structure and the origin coordinate of the inclined wedge stamping coordinate system related to the standard parts, denoted as information P;

[0043] After the standard parts are assembled, record the external reference feature A associated with the information P P , the A P It includes the model, installation position, quantity, distribution spacing and reference point of the standard parts. During the first installation, the origin coordinates of the wedge punching coordinate system are used as the reference point.

[0044] When information P is updated, A P The information in the standard is based on the datum reference point and is updated synchronously in the order of distribution spacing > installation position > quantity > model to generate new standard parts.

[0045] For example: Figure 5 As shown, a guide plate is installed on the top surface of the inclined wedge, and the information P includes Ls, Lb and the origin of the inclined wedge stamping coordinate system. When the length Lb of the base top plane of the inclined wedge body is changed, the top surface guide plate will first adjust the distribution spacing to ensure the consistency of the contact area and force of the guide sliding surface. When the spacing adjustment cannot meet the requirements, an offset of the installation position will be used to meet the sliding function and safety requirements of the guide sliding surface. If it still cannot be met, the system will achieve the above requirements by changing the number or model of the guide plates.

[0046] When information P is deleted or part of it is abandoned, for example, the origin of the wedge punching coordinate system is abandoned as the installation reference point of the guide plate M1, and the midpoint of the base top plane length Lb is used as the reference for evenly distributing the top surface guide plate M1, a universal unique identifier q will be backed up, and A P The elements in are modified to feature A q , A q Change the reference point from the origin of the cam punch coordinate system to the midpoint of Lb, based on A q Regenerate the top guide plate M2. The adjustment principles of other standard parts are similar to those of the top guide plate and will not be repeated here.

Claims

1. A method of parametric creation of a suspension wedge, characterized in that, Comprise: Step 1, input modeling parameters, the modeling parameters include: , , H, Ld, Lw, Lb, Lbk and Ls, wherein, represents the punching angle of the wedge; represents the plane angle of the wedge, H represents the distance from the wedge base plane to the wedge punching coordinate system origin; Ld represents the driving length of the wedge; Lw represents the wedge working width, Lb represents the base top plane length, Lbk represents the base rear length, Ls is the side forming size of the wedge; Step 2, Establishing the coordinate system of the inclined wedge stamping by coordinate transformation ; Step 3, based on , , H, Ld, Lw, Lb and Lbk create a wedge cross section in wedge punch coordinate system ; Step 4, according to the Ls to stretch and shell to get three-dimensional wedge main structure of wedge section; The step 2 specifically is: The mold coordinate system is denoted as Axis 1, and the intermediate conversion coordinate system is denoted as Axis 2, which is composed of a set of bases of the inclined wedge stamping coordinate system added to the origin of the mold coordinate system, and the set of bases is denoted as: , , ; Origin of the coordinate system of the inclined wedge stamping ) is the intersection point of the bottom plane, back plane and YZ plane of the intermediate conversion coordinate system Axis2 of the insert mounted on the inclined wedge The coordinates of the origin of the wedge punch coordinate system ( ) is converted into the coordinate value of the wedge origin in the mold coordinate system Axis1 through the coordinate conversion formula ( ); Adjustment( )make( ) is an integer, then determine ( ); The inclined wedge punching coordinate system is composed of a set of bases of the inclined wedge punching coordinate system plus the coordinates of the inclined wedge origin ( )constitute; The coordinate conversion formula is: .

2. The method of parametric creation of a suspension wedge of claim 1, wherein, Also include step 5, on three-dimensional wedge main structure assembly standard parts.

3. The method of parametrically creating a suspension wedge of claim 2, wherein, The standard parts include: top guide, safety screw, shaped insert, side guide, side pressing plate, forced reset plate, drive guide and buffer block.

4. The method of parametric creation of a suspension cam according to claim 2 or 3, characterized in that, Also include step 6, standard parts information association: Record the modeling parameters of three-dimensional wedge main structure and the origin coordinates of wedge stamping coordinate system related to standard parts, marked as information P; Record the external reference features associated with information P after the assembly of the standard parts is complete , The model of the standard part, the installation position, the number, the distribution pitch, and the reference point are contained therein.

5. The method of parametrically creating a suspension cant by claim 4, wherein, When the information P appears to be updated, The information in the table is updated synchronously according to the priority order of distribution distance, installation position, quantity and model with reference to the reference point, thereby generating a new standard part.

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