CN106218718A - Knuckle that a kind of FSAE racing car metal 3D prints and preparation method thereof - Google Patents

Abstract

The present invention discloses knuckle of a kind of FSAE racing car metal 3D printing and preparation method thereof, and knuckle includes that hub bearing installing hole, hub bearing installing hole are arranged above A arm installation portion, and top is provided with two upper A arm installing holes；Being lower A arm installation portion below hub bearing installing hole, bottom is provided with lower A arm installing hole；Lower A arm installation portion side is provided with track rod installation portion, and track rod installation portion is provided with two track rod installing holes；Upper A arm installation portion, lower A arm installation portion, track rod installation portion and hub bearing installing hole sidewall are engraved structure；Hub bearing installing hole side is provided with wheel speed sensors installation portion, opposite side side be equipped with brake caliper installation portion up and down.The present invention is by processing upper A arm installation portion, lower A arm installation portion, track rod installation portion and hub bearing installing hole sidewall hollow out, knuckle strength and stiffness can be improved, knuckle lightweight, beneficially complete vehicle quality is made to alleviate so that unsprung mass responds faster.

Description

A kind of FSAE racing car metal 3D printing steering knuckle and its manufacturing method

technical field

The invention relates to a formula racing car part, in particular to a metal 3D printed steering knuckle for an FSAE racing car and a manufacturing method thereof.

Background technique

In the Formula Student racing competition, under the condition of constant power, the mass of the car determines the speed of acceleration, except for the influence of the driver and other factors. On the basis of the former, the weight is extremely light, and for the suspension, the weight reduction of the key part - the steering knuckle is not only conducive to reducing the weight of the vehicle, but also makes the unsprung mass respond faster. However, for many teams, due to the limitation of transmission processing, the lightweight of steering knuckles of many teams has reached the extreme, and it is difficult to break through. However, with the rise of 3D printing technology, the lightweight of steering knuckles has found a new breakthrough.

Contents of the invention

Purpose of the invention: In order to overcome the limitations of traditional processing technology, the present invention aims to provide a steering knuckle and its manufacturing method for FSAE racing cars that use metal 3D printing technology to reduce weight and improve strength and rigidity.

Technical solution: In order to solve the above-mentioned technical problems, the present invention adopts the following technical solution:

A FSAE racing car metal 3D printed steering knuckle, including a hub bearing installation hole, above the hub bearing installation hole is an upper A-arm installation part, and the top of the upper A-arm installation part is provided with two upper A-arm installation holes; the hub bearing installation Below the hole is the mounting part of the lower A-arm, and the bottom of the mounting part of the lower A-arm is provided with the mounting hole of the lower A-arm; Tie rod mounting holes; upper A-arm mounting parts, lower A-arm mounting parts, steering tie rod mounting parts and wheel hub bearing mounting hole side walls are all hollowed out; one side of the wheel hub bearing mounting hole is equipped with a wheel speed sensor mounting part, There are two wheel speed sensor installation holes on the wheel speed sensor installation part; there are brake caliper installation parts on the upper and lower sides of the other side of the wheel hub bearing installation hole, and each brake caliper installation part has a brake caliper installation part. hole.

Working principle: the steering knuckle of the FSAE racing car metal 3D printing of the present invention; the initial 3D model is established under the condition of meeting the installation requirements, and the model is not hollowed out at this time, and the original model is imported into the software capable of topology optimization, and then Input the detailed force calculation into the model, after the optimization is completed, carry out reverse modeling according to the optimized model, check the strength of the remodeled model, and finally carry out metal 3D printing. The analysis results show that, compared with the traditional model, the mass of the model is small, but the strength and rigidity are much higher than the traditional model.

The hollow parts of the upper A-arm installation part, the lower A-arm installation part and the steering tie rod installation part of the steering knuckle are all spatial network structures, which are generated through software optimization; the strength and stiffness of the steering knuckle can be improved, and the quality of the steering knuckle can be reduced .

The inner wall of the hub bearing installation hole is provided with a ring of shoulders along the hole circumference, and the hub bearing installation hole is divided into two bearing installation parts on the front and back sides. The diameter of the two bearing installation holes is 80mm, and the thickness is 16mm. The shoulder hole diameter is 74.4mm, and the thickness is 4mm; it can facilitate the installation of hub bearings.

A method for manufacturing a steering knuckle printed with FSAE racing metal 3D, comprising the following steps:

1) According to the basic requirements of suspension installation, use CATIA3D modeling software to establish the basic model of steering knuckle;

2) Divide the basic model of the steering knuckle obtained in step 1) into four parts, the upper A-arm installation part, the lower A-arm installation part, the beam rod installation part and the wheel hub installation part, and then import the basic model into the topology optimization software solidthinking inspire , establish a constraint relationship, input more than one limit condition, conduct joint analysis under the limit condition, and obtain the analysis result according to the optimization condition of the maximum stiffness;

3), analyze and check the analysis results of step 2), use the polynurbs function of the topology optimization software, carry out reverse modeling on the optimized steering knuckle basic model, obtain the optimized model, and then perform strength analysis on the optimized model, if the stiffness requirements are met 3D printing can be carried out to obtain blank parts;

4) Use CNC machine tools to finish the blank parts to ensure the coaxiality of the bearing holes and the accuracy of each hole position.

The technologies not mentioned in the present invention are all prior art.

Beneficial effects: the steering knuckle of the FSAE racing car metal 3D printing of the present invention can improve the strength and rigidity of the steering knuckle by hollowing out the upper A-arm installation part, the lower A-arm installation part, the steering tie rod installation part and the side wall of the hub bearing installation hole , can reduce the weight of the steering knuckle, which is not only conducive to reducing the weight of the vehicle, but also makes the unsprung mass respond faster.

Description of drawings

Fig. 1 is the structure schematic diagram of steering knuckle basic model of the present invention;

Fig. 2 is the structure schematic diagram of steering knuckle of the present invention;

In the figure, 1 is the hub bearing installation hole, 2 is the upper A-arm installation part, 3 is the upper A-arm installation hole, 4 is the lower A-arm installation part, 5 is the lower A-arm installation hole, 6 is the tie rod installation part, 7 is the tie rod installation hole, 8 is the wheel speed sensor installation part, 9 is the wheel speed sensor installation hole, 10 is the brake caliper installation part, 11 is the brake caliper installation hole, 12 is the basic model of the steering knuckle, 13 is the shaft shoulder.

detailed description

In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

Example 1

As shown in Figure 1-2, a steering knuckle printed by FSAE racing metal 3D includes a hub bearing installation hole 1, and above the hub bearing installation hole 1 is the upper A-arm installation part 2, and the top of the upper A-arm installation part 2 is set There are two upper A-arm mounting holes 3; the lower A-arm mounting part 4 is located below the hub bearing mounting hole 1, and the lower A-arm mounting hole 5 is provided at the bottom of the lower A-arm mounting part 4; There is tie rod installation part 6, on which two tie rod installation holes 7 are arranged; upper A-arm installation part 2, lower A-arm installation part 4, steering tie rod installation part 6 and hub bearing installation The side walls of the hole 1 are all hollowed out; one side of the hub bearing mounting hole 1 is provided with a wheel speed sensor mounting part 8, and the wheel speed sensor mounting part 8 is provided with two wheel speed sensor mounting holes 9; A brake caliper installation part 10 is arranged on the upper and lower sides of one side, and each brake caliper installation part 10 is provided with a brake caliper installation hole 11; the upper A-arm installation part 2 of the steering knuckle and the lower A-arm installation part 4 and the hollow part of the steering tie rod installation part 6 are spatial network structures, which are generated through software optimization; the inner wall of the hub bearing installation hole 1 is provided with a ring of shoulders 13 along the hole circumference, and the hub bearing installation hole 1 is divided into positive and negative There are two bearing mounting parts on both sides, the diameter of the two bearing mounting holes is 80mm, and the thickness is 16mm, and the shaft shoulder 13 in the middle has a diameter of 74.4mm and a thickness of 4mm.

The manufacturing method of the above-mentioned FSAE racing car metal 3D printed steering knuckle includes the following steps:

1), according to the basic requirements of suspension installation, use CATIA3D modeling software to establish the steering knuckle basic model 12;

2), divide the steering knuckle basic model 12 obtained in step 1) into 4 parts, the upper A-arm installation part 2, the lower A-arm installation part 4, the beam rod installation part and the wheel hub installation part, and then import the basic model into the topology optimization software In solidthinkinginspire, establish a constraint relationship, input more than one limit condition, conduct joint analysis under the limit condition, and obtain the analysis result according to the optimization condition of the maximum stiffness;

3), analyze and check the analysis results of step 2), use the polynurbs function of the topology optimization software, carry out reverse modeling on the optimized steering knuckle basic model 12, obtain the optimized model, and then perform strength analysis on the optimized model to meet the stiffness requirements Then 3D printing can be carried out to obtain blank parts;

4) Use CNC machine tools to finish the blank parts to ensure the coaxiality of the bearing holes and the accuracy of each hole position.

The material used in the FSAE racing car metal 3D printing steering knuckle of the present invention is titanium base (Ti64). The metal 3D printing technology can achieve a processing accuracy of ±0.2μm for large parts, the minimum wall thickness can reach 3mm-4mm, and the surface roughness Rz< 1μm, the ultimate tensile strength can reach about 1200MPa, the yield strength is about 1050MPa, and the elongation at break is about 10%. Based on the above conditions, when establishing the original model, the installation hole position is not optimized, that is, the structure with installation requirements should not be used as the optimal design space, that is, a reasonable optimal design space is considered when establishing the original model. Attachment 1 is the original Model, in which each mounting hole is not used as an optimal design space, the original model is imported into the optimization analysis software, the constraint conditions and the magnitude and direction of the force are input, and the optimization mode is selected based on the strength and machining accuracy of the above materials. After the analysis is completed, use the 3D The modeling software imitates the analysis results to carry out reverse modeling. After the modeling is completed, the model is re-imported into the force analysis software for strength verification and fatigue analysis. After confirming that it is correct, 3D printing is performed; the rough parts are obtained; The blanks are finished to ensure the coaxiality of the bearing holes and the accuracy of each hole position.

The steering knuckle of the FSAE racing car metal 3D printing of the present invention; by hollowing out the upper A-arm installation part 2, the lower A-arm installation part 4, the steering tie rod installation part 6 and the side wall of the hub bearing installation hole 1, the strength and the strength of the steering knuckle can be improved. Stiffness can reduce the weight of the steering knuckle, which is not only conducive to reducing the weight of the vehicle, but also makes the unsprung mass respond faster.

The above are only preferred embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, the positions of each facility can also be adjusted, and these adjustments should also be regarded as the present invention. protection scope of the invention.

Claims (4)

1. the knuckle that FSAE racing car metal 3D prints, including hub bearing installing hole (1), it is characterised in that: described take turns Hub bearing mounting hole (1) is arranged above A arm installation portion (2), and upper A arm installation portion (2) top is provided with two upper A arm installing hole (3)； Hub bearing installing hole (1) lower section is lower A arm installation portion (4), and lower A arm installation portion (4) bottom is provided with lower A arm installing hole (5)；Under A arm installation portion (4) side is provided with track rod installation portion (6), and track rod installation portion (6) is provided with two and turns to horizontal drawing Bar installing hole (7)；Upper A arm installation portion (2), lower A arm installation portion (4), track rod installation portion (6) and hub bearing installing hole (1) sidewall is engraved structure；Hub bearing installing hole (1) side side is provided with wheel speed sensors installation portion (8), and wheel speed senses Device installation portion (8) is provided with two wheel speed sensors installing holes (9)；Being all provided with up and down of hub bearing installing hole (1) opposite side side There is brake caliper installation portion (10), each brake caliper installation portion (10) is equipped with brake caliper installing hole (11).

The knuckle that the most according to claim 1, FSAE racing car metal 3D prints, it is characterised in that: the upper A of described knuckle The hollow-out parts of arm installation portion (2), lower A arm installation portion (4) and track rod installation portion (6) is space net structure, passes through The optimization of software generates.

The knuckle that FSAE racing car metal 3D the most according to claim 1 or claim 2 prints, it is characterised in that: described hub bearing Hub bearing installing hole (1), along being provided with a circle shaft shoulder (13) hole week, is divided into two bearing peaces of tow sides by installing hole (1) inwall Dress portion, two bearing mounting hole apertures are 80mm, and thickness is 16mm, and the middle shaft shoulder (13) aperture is 74.4mm, thickness For 4mm.

4. the manufacture method of the knuckle that the FSAE racing car metal 3D described in claim 1-3 any one prints, its feature exists In: comprise the following steps:

1), CATIA3 dimension modeling software is used to set up knuckle basic model (12) according to the installation basic demand of suspension；

2), by step 1) gained knuckle basic model (12) is divided into 4 parts, upper A arm installation portion (2), lower A arm installation portion (4), bundle bar installation portion and wheel hub mounted portion, then basic model is imported to topological optimization software solidthinking Inside inspire, set up restriction relation, input more than one limiting condition, conjoint analysis under limiting condition, firm according to maximum The optimal conditions of degree, draws analysis result；

3), to step 2) analysis result be analyzed check, utilize the polynurbs function of topological optimization software, to optimize Knuckle basic model (12) carries out reverse modeling, obtains Optimized model, then Optimized model is carried out intensity analysis, meets just Degree requires then to carry out 3D printing, obtains blank part；

4), with Digit Control Machine Tool, blank part is carried out polish, to ensure axiality and position, each hole precision of dead eye.