CN115577442A - Design method for die-casting aluminum alloy shock absorption tower structure with double fork arms - Google Patents
Design method for die-casting aluminum alloy shock absorption tower structure with double fork arms Download PDFInfo
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Abstract
The invention belongs to the technical field of vehicle cabin damping tower structures, and particularly relates to a design method of a die-casting aluminum alloy damping tower structure with double fork arms, which comprises the following steps: s1: extracting a constraint boundary of the damping tower casting according to the whole vehicle modeling function; s2: determining the integral molding scheme of the damping tower casting, and dividing a casting movable mold molding area, a casting fixed mold molding area and a casting core-pulling molding area; s3: an auxiliary structure is added on the main body structure of the damping tower casting; s4: and adding a mounting point structure on the main body structure of the damping tower casting. The purpose is as follows: the die-casting aluminum alloy damping tower structure with the double fork arms is used for solving the problems that five-axis and above equipment or four-axis equipment is required to be matched with more than two sets of clamps and be clamped for multiple times when the double fork arm die-casting aluminum alloy damping tower structure with the existing design in the background technology is processed, so that the construction cost and the clamp cost of a processing production line of the damping tower are high, the processing procedure of a single piece is more, the processing beat is longer, and meanwhile, the size precision control risk can be increased by multiple times of clamping.
Description
Technical Field
The invention belongs to the technical field of vehicle cabin damping tower structures, and particularly relates to a design method of a die-casting aluminum alloy damping tower structure with double fork arms.
Background
With the vigorous development of new energy automobiles and the driving of policies such as carbon emission and the like in large environments, the lightweight automobile and the integration technology of automobile body part structures are continuously innovated.
The shock absorption tower is one of important parts of an automobile and is a key part for connecting a shock absorber and a front automobile body, and impact load caused by uneven ground in the running process of the automobile is transmitted to the shock absorption tower through the attenuation of the shock absorber and then dispersed to the front automobile body. The automobile shock absorption tower plays an important role in improving the running stability of the automobile and the NVH performance of the whole automobile. At present, a damping tower mainly adopts a welding process of a plurality of steel plate stamping parts, the manufacturing process is complex, the production cost is high, the mounting and dismounting efficiency is low, and the temperature difference near welding spots in the welding process easily causes local stress concentration to influence the overall assembly precision of the structure. The die-casting aluminum alloy shock absorption tower has become mature gradually as a representative product for vehicle body light weight and integration, but the development of an aluminum alloy structural part suitable for a die-casting process mainly depends on experience, and meanwhile, repeated tests are carried out, so that the design efficiency is low and the light weight effect is poor.
Chinese patent: CN108038308A, which discloses a structural design method of an aluminum alloy damping tower, and discloses extracting relevant performance data and establishing a topological optimization space according to the structural analysis and experimental test results of the original steel damping tower; then, dividing a design area and a non-design area of the topological optimization space; determining reasonable position distribution of the reinforcing ribs in the design area through topology optimization; according to the reinforcing rib position distribution obtained from the topological optimization result, a damping tower model with reinforcing rib distribution is reestablished, and the optimal thickness of the reinforcing rib is further obtained through size optimization; and finally, checking the size-optimized damping tower model to ensure that the designed structure meets the use performance requirement. The invention shortens the design period, improves the design efficiency, has obvious structure lightweight effect and obviously improves the comprehensive performance.
However, at present, the die-casting aluminum alloy shock absorption tower structure with the double-fork arm structure has a common phenomenon: 1. the double-fork arm mounting surface is in a space angle relative to the whole vehicle coordinate XYZ; 2. most of the corresponding sensors, wire harness holes and the like on the shock absorption tower are in space angles. The two phenomena result in that five-axis and above equipment or four-axis equipment is matched with more than two sets of clamps and is clamped for multiple times during machining of the damping tower. Therefore, the construction cost and the clamp cost of a processing production line of the damping tower are high, the number of single processing procedures is large, the processing beat is long, and meanwhile, the risk of controlling the size precision can be increased by clamping for many times.
Disclosure of Invention
The purpose of the invention is: the design method is used for solving the problems that five-axis and above equipment or four-axis equipment is required to be matched with more than two sets of clamps and repeatedly clamped when the double-fork-arm die-casting aluminum alloy damping tower structure with the double fork arms in the prior art is machined, so that the construction cost and the clamp cost of a machining production line of the damping tower are high, a plurality of single machining procedures are needed, the machining beat is long, and meanwhile, the risk of size precision control can be increased due to repeated clamping.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a design method for a die-casting aluminum alloy shock absorption tower structure with double fork arms comprises the following steps:
s1: extracting the constraint boundary of the damping tower casting according to the modeling function of the whole vehicle, and determining the mounting point position and the clearance control of each pair of hand pieces;
s2: determining the integral molding scheme of the damping tower casting, and dividing a casting movable mold molding area, a casting fixed mold molding area and a casting core-pulling molding area;
s3: an auxiliary structure is added on the main body structure of the damping tower casting;
s4: and adding a mounting point structure on the main body structure of the damping tower casting.
On the basis of the scheme, the invention also improves the following steps:
further, in the step S2, when determining the overall parting scheme of the damper tower casting, an input double-yoke structural characteristic is used as a main basis for designing the film outlet direction of the damper tower casting, an initial reference plane is formed, a core-pulling parting plane is obtained according to the initial reference plane, the axis of the damping spring is used as a main parting initial reference direction, one direction between the main parting initial reference direction and the core-pulling parting plane is selected as a main parting direction of the damper tower casting, and a casting moving mold molding region, a casting fixed mold molding region and a casting core-pulling molding region can be divided according to the main parting direction of the damper tower casting.
Further, the initial reference plane is formed by connecting the two mounting points of the input double-fork arm structural feature in the forming process, so that the two mounting points form a straight line which is the rotation axis of the double-fork arm, and the initial reference plane is formed by stretching the straight line in the Z direction.
Further, in the process of forming the core-pulling parting plane, the initial reference plane is rotated along the rotation axis of the double-fork arm to form the core-pulling parting plane, and the normal direction of the core-pulling parting plane close to the inner side of the cabin is the core-pulling direction.
Further, the initial reference plane is rotated by an angle greater than 1.5 ° along the rotation axis of the bifurcating arm and the rotated initial reference plane intersects the stringer.
Further, in the process of selecting the main parting direction of the shock tower castings, the main parting direction of the shock tower castings is perpendicular to the core-pulling direction.
Further, in the step S2, when the casting moving mold molding region, the casting fixed mold molding region and the casting core-pulling molding region are divided, the upper part of the shock tower casting in the main molding direction is taken as the casting fixed mold molding direction, the structure region below the shock tower casting in the main molding direction is taken as the casting moving mold molding direction, and the local structure in the core-pulling direction of the shock tower casting is taken as the core-pulling molding region.
Further, in the step S3, when an auxiliary structure is added to the main structure of the damping tower casting, a damping spring mounting structure, a double-fork arm mounting structure, a clearance gap for movement of the double-fork arm, a shotgun lap joint structure, and a longitudinal beam lap joint structure are sequentially added.
Further, in the step S1, the mounting point structures include, but are not limited to, a wire harness mounting point, a sensor mounting point, and an electrical appliance mounting point, and when adding, the mounting point structures should satisfy the principle that the processing hole directions of all the mounting surfaces and the normal direction of the processing surface must be kept perpendicular to the rotation axis of the dual-fork arm or the core pulling direction.
Further, in the step S1, when the main structure of the casting of the damping tower does not meet the principle of adding the mounting point structure, the local convex structure is added, and then the plane of the local convex structure is corrected to be perpendicular to the rotation axis of the double-fork arm or the core pulling direction.
The invention adopting the technical scheme has the advantages that:
1. by changing the parting design mode and the mounting point structure design of the die casting structure of the damping tower, the problems of high processing cost, low efficiency and high processing precision risk caused by the double-yoke mounting surface and the mounting point structure are solved;
2. through the damping tower structure design method in the scheme, in the damping tower die-casting process, the machining operation of the whole damping tower can be finished at most by using a four-axis machine and equipment and one set of clamp, the machining efficiency is improved, and the machining cost is reduced.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic diagram of the definition of the boundary and parting direction of a damping tower in the design method of the die-casting aluminum alloy damping tower structure with double fork arms;
FIG. 2 is a schematic structural diagram of a damping tower main body in the design method of the die-casting aluminum alloy damping tower structure with the double fork arms;
FIG. 3 is a schematic view of a structure of an upper mounting point of a shock tower in the design method of the die-casting aluminum alloy shock tower structure with the double fork arms;
the main element symbols are as follows:
(31) The method comprises the following steps of a whole vehicle coordinate system 1, a double-fork arm structure 2, a double-fork arm rotation axis 3, a suspension structure 4, a suspension structure axis 5, an initial reference plane 6, a damper tower core-pulling direction 7, a casting movable mold molding direction 8, a casting fixed mold molding direction 9, a fixed mold molding region 10, a movable mold molding region 11, a local core-pulling region 12, an example A13, an example B14, an installation surface normal direction and an installation hole axis direction 15 of the example A, and an installation surface normal direction and an installation hole axis direction 16 of the example B.
Detailed Description
The present invention will be described in detail with reference to the drawings and specific embodiments, wherein like reference numerals are used for similar or identical parts in the drawings or the description, and implementations not shown or described in the drawings are known to those of ordinary skill in the art. In addition, directional terms, such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present invention.
As shown in figures 1 to 3, the design method of the die-casting aluminum alloy shock absorption tower structure with the double fork arms comprises the following steps:
s1: in CATIA software, inputting and sorting out constraint boundary conditions of a damping tower casting according to the function model of a whole vehicle, extracting and making a double-fork-arm structure 2 and a suspension structure 4 according to a whole vehicle coordinate system 1, and determining the mounting point position and gap control of each pair of hand pieces;
s2: connecting the mounting points on two sides of the input double-fork-arm structure sketch to form a straight line, wherein the straight line is a double-fork-arm rotation axis 3, making a suspension structure axis 5 according to a suspension structure 4, and stretching along the Z direction of the whole vehicle coordinate according to the double-fork-arm rotation axis 3 to obtain an initial reference plane 6;
the method comprises the steps that an initial reference plane 6 rotates for a certain angle along a double-fork-arm rotation axis 3, the angle is generally larger than 1.5 degrees, the initial reference plane 6 needs to be intersected with a longitudinal beam after rotating, a core pulling plane is obtained, and the normal direction of the core pulling plane close to the inner side of a cabin is the core pulling direction 7 of the shock absorber tower. In some embodiments, the specific value of the rotation angle depends on the overlapping mode and the width of the bottom of the shock absorbing tower and the longitudinal beam of the vehicle body, an intersection line of the core pulling plane and the longitudinal beam can be made, and the distance between the intersection line and the edge of the longitudinal beam in the Y direction is measured to be the available overlapping width.
The axis of the damping spring is used as the initial reference direction of main parting, the surface perpendicular to the core-pulling plane is made through the suspension axis 5, and on the plane, a straight line in an included angle formed by the suspension axis 5 and the core-pulling plane is taken as the main parting direction of the damping tower casting. In the process of selecting the straight line, the following conditions need to be met: a. the straight line needs to be within an included angle; b. the lapping mode and the lapping width of the bottom of the shock absorption tower and the longitudinal beam of the vehicle body need to be considered; c. reinforcing structures such as a reinforcing rib or a reinforcing cavity in the Z direction of the damping tower need to be considered, so that the increase of metal materials caused by die drawing is reduced as much as possible; d. the main cavity and the suspension spring which are stretched out by the shock absorption tower need to meet the requirement of clearance. The main parting direction of the damping tower casting is ensured to be vertical to the core-pulling direction 7 as far as possible, so that the failure rate of producing the die-casting damping tower die is reduced.
According to the main parting direction of the shock tower casting, the upper part of the shock tower casting in the main parting direction is taken as a casting fixed die forming direction 9, the lower structure region of the shock tower casting in the main parting direction is taken as a casting movable die forming direction 8, and the local structure of the shock tower casting in the core-pulling direction 7 is taken as a core-pulling forming region.
S3: the damping tower casting main body is sequentially added with a damping spring mounting structure, a double-fork arm mounting structure, a clearance gap for double-fork arm movement, a shotgun lap joint structure and a longitudinal beam lap joint structure. In some embodiments, the damping spring mounting structure is designed in the middle of the main parting direction of the damping tower casting, the double-fork arm mounting structure is designed on the upper portion of the main parting direction of the damping tower casting, the clearance gap for movement of the double-fork arm is designed on the rear side of the double-fork arm mounting structure, the shotgun overlapping structure is designed on the edge of the main parting direction of the damping tower casting, and the longitudinal beam overlapping structure is designed on the shotgun overlapping structure of the main parting direction of the damping tower casting, so that the damping tower casting structure is formed, as shown in fig. 2, a movable mold forming area 11, a fixed mold forming area 10 and a local core pulling area 12 are obtained.
S4: the damping tower casting main body structure is added with a mounting point structure, and in some embodiments, the mounting point structure mainly comprises a wiring harness mounting point, a sensor mounting point and an electric appliance mounting point. When the mounting point structures are designed, the following principles are satisfied: the processing hole directions of all the mounting surfaces and the normal directions of the processing surfaces are required to be kept perpendicular to the rotation axis of the double-fork arm or the core pulling direction; when the main structure of the damping tower casting does not meet the principle of adding the mounting point structure, the plane of the local convex structure is corrected to be perpendicular to the rotation axis of the double-fork arm or the core pulling direction by adding the local convex structure.
In some embodiments, as shown in fig. 3, the mounting point structure design example a13, the mounting point structure design example B14, the structural form, and the mounting surface normal and the mounting hole axis direction 15 of the example a13 are modified to be perpendicular to the bifurcating arm rotation axis 3 using a local convex structure; the mounting surface normal and mounting hole axis direction 16 of example B14 were modified to be perpendicular to the core back direction 7.
According to the aluminum alloy damping tower with the double fork arms, when the aluminum alloy damping tower is formed in a die-casting mode, all faces of the aluminum alloy damping tower are machined only by four-axis machining equipment and one set of clamp, workpieces can be machined only by rotating along the rotation axis 3 of the double fork arms or the core pulling direction 7, and compared with the existing damping tower die casting design, the machining cost can be effectively reduced, the machining efficiency is improved, and the machining precision is improved.
The method for designing the die-casting aluminum alloy shock absorption tower structure with the double fork arms is described in detail above. The description of the specific embodiments is only intended to facilitate an understanding of the method of the invention and its core ideas. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A design method of a die-casting aluminum alloy shock absorption tower structure with double fork arms is characterized in that: the method comprises the following steps:
s1: extracting a constraint boundary of a damping tower casting according to the whole vehicle modeling function, and determining the installation point position and clearance control of each counterpart;
s2: determining a parting scheme of the whole damping tower casting, and dividing a casting movable die molding area, a casting fixed die molding area and a casting core-pulling molding area;
s3: an auxiliary structure is added on the main body structure of the damping tower casting;
s4: and adding a mounting point structure on the main body structure of the damping tower casting.
2. The design method of the die-casting aluminum alloy shock absorption tower structure with the double fork arms as claimed in claim 1, wherein the design method comprises the following steps: in the step S2, when the overall parting scheme of the damping tower casting is determined, the input structural characteristics of the double fork arms are used as the main basis for designing the film outlet direction of the damping tower casting, an initial datum plane is formed, a core-pulling parting plane is obtained according to the initial datum plane, the axis of the damping spring is used as the main parting initial reference direction, one direction between the main parting initial reference direction and the core-pulling parting plane is selected as the main parting direction of the damping tower casting, and a casting movable die molding region, a casting fixed die molding region and a casting core-pulling molding region can be divided according to the main parting direction of the damping tower casting.
3. The design method of the die-casting aluminum alloy shock absorption tower structure with the double fork arms as claimed in claim 2, is characterized in that: and in the forming process of the initial reference plane, connecting the mounting points on two sides of the input double-fork arm structural feature, so that the two mounting points form a straight line which is the rotation axis of the double-fork arm, and stretching the straight line in the Z direction to form the initial reference plane.
4. The design method of the die-casting aluminum alloy shock absorption tower structure with the double wishbone as claimed in claim 3, wherein the design method comprises the following steps: in the forming process of the core-pulling parting plane, the initial reference plane is rotated along the rotation axis of the double-fork arm to form the core-pulling parting plane, and the normal direction of the core-pulling parting plane close to the inner side of the engine room is the core-pulling direction.
5. The design method of the die-casting aluminum alloy shock absorption tower structure with the double wishbone as claimed in claim 4, wherein the design method comprises the following steps: the initial reference plane is rotated by an angle greater than 1.5 ° along the rotation axis of the bifurcating arm, and the rotated initial reference plane intersects the stringer.
6. The design method of the die-casting aluminum alloy shock absorption tower structure with the double wishbone as claimed in claim 4, wherein the design method comprises the following steps: in the process of selecting the main parting direction of the damping tower casting, the main parting direction of the damping tower casting is perpendicular to the core-pulling direction.
7. The design method of the die-casting aluminum alloy shock absorption tower structure with the double forks according to claim 4, characterized in that: in the step S2, when a casting moving die molding area, a casting fixed die molding area and a casting core-pulling molding area are divided, the part, close to the upper part, of the shock absorption tower casting in the main molding direction is used as the casting fixed die molding direction, the structure area, close to the lower part, of the shock absorption tower casting in the main molding direction is used as the casting moving die molding direction, and the local structure of the shock absorption tower casting in the core-pulling direction is used as the core-pulling molding area.
8. The design method of the die-casting aluminum alloy shock absorption tower structure with the double fork arms as claimed in claim 1, is characterized in that: and in the step S3, when an auxiliary structure is added to the main body structure of the damping tower casting, a damping spring mounting structure, a double-fork arm mounting structure, a clearance gap for movement of the double-fork arm, a shotgun lap joint structure and a longitudinal beam lap joint structure are sequentially added.
9. The design method of the die-casting aluminum alloy shock absorption tower structure with the double forks according to any one of claims 3 or 4, characterized in that: in the step S1, the mounting point structures include, but are not limited to, a wire harness mounting point, a sensor mounting point, and an electrical appliance mounting point, and when the mounting point structures are added, the principle that the directions of the processing holes of all the mounting surfaces and the normal direction of the processing surface must be kept perpendicular to the rotation axis of the bifurcate arm or the core-pulling direction is satisfied.
10. The design method of the die-casting aluminum alloy shock absorption tower structure with the double yoke as claimed in claim 9, wherein the method comprises the following steps: in the step S1, when the main structure of the damping tower casting does not meet the installation point structure adding principle, the plane of the local convex structure is corrected to be perpendicular to the rotation axis of the double-fork arm or the core pulling direction by adding the local convex structure.
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| CN202210904556.8A CN115577442A (en) | 2022-07-29 | 2022-07-29 | Design method for die-casting aluminum alloy shock absorption tower structure with double fork arms |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116776693A (en) * | 2023-06-26 | 2023-09-19 | 小米汽车科技有限公司 | Shock absorber optimal design method and device, electronic equipment and storage medium |
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- 2022-07-29 CN CN202210904556.8A patent/CN115577442A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116776693A (en) * | 2023-06-26 | 2023-09-19 | 小米汽车科技有限公司 | Shock absorber optimal design method and device, electronic equipment and storage medium |
| CN116776693B (en) * | 2023-06-26 | 2024-03-19 | 小米汽车科技有限公司 | Shock absorber optimal design method and device, electronic equipment and storage medium |
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