CN218862715U

CN218862715U - High-performance titanium alloy exhaust pipe for vehicle

Info

Publication number: CN218862715U
Application number: CN202223582040.0U
Authority: CN
Inventors: 李向伟; 张文侠
Original assignee: Baoji Lihua Nonferrous Metals Co ltd
Current assignee: Baoji Lihua Nonferrous Metals Co ltd
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-04-14
Anticipated expiration: 2032-12-31

Abstract

The utility model provides a high performance automobile-used titanium alloy blast pipe chooses for use the titanium alloy straight tube to adopt and cuts apart welding forming method to make the titanium alloy blast pipe. The titanium alloy exhaust pipe comprises a body (1), wherein at least one bent part is arranged on the body (1), the radian of the bent part is A degrees, and the bent part is formed by sequentially welding a plurality of pipe elbows (12-N) through vacuum argon arc welding. Compared with the traditional stainless steel material and bending process, the titanium alloy exhaust pipe has higher strength and quality consistency, and the average weight reduction rate is more than 45%; the impact force of high-temperature blast pulse load is obviously improved, and the defect that a bent part is easy to fatigue and damage is overcome; the exhaust pipe is not rusted and has longer service life, and the market blank of the titanium alloy exhaust pipe for the vehicle is filled.

Description

High-performance titanium alloy exhaust pipe for vehicle

Technical Field

The utility model relates to a belong to titanium material processing technology field, relate to the blast pipe, especially relate to an automobile-used titanium alloy blast pipe of high performance.

Background

The titanium alloy has the characteristics of high specific strength, high corrosion resistance, high heat resistance and the like, works in humid atmosphere and seawater medium, and has corrosion resistance far superior to that of stainless steel; the resistance to pitting corrosion, acid corrosion and stress corrosion is strong; has excellent corrosion resistance to alkali, chloride, chlorine organic matters, nitric acid, sulfuric acid and the like. Therefore, the titanium alloy is used for manufacturing the exhaust pipe, so that the service life of the exhaust pipe can be prolonged, high-temperature exhaust gas of an engine can be discharged better and smoothly, and the sound effect (or sound waves) can be better highlighted.

At present, the mainstream material of the exhaust pipe is stainless steel, and the titanium alloy material is used for racing cars, high-grade sports cars and a small amount of modified cars, and in comparison, the titanium alloy material exhaust pipe has the following characteristics:

1. light weight and high strength. Compared with the titanium alloy material with the same volume, the stainless steel material is lighter, about 1/3 of the stainless steel material, the strength is higher, and the light weight is obvious.

2. Has good heat resistance and heat dissipation. Although the exhaust pipe can bear high temperature at present, the heat resistance and the heat dissipation of the titanium alloy are obviously better than those of stainless steel in comparison; the higher the high temperature resistance degree, and the like.

3. The more clear and surging the sound wave: because the exhaust pipe wall of titanium alloy is thinner, compared with the stainless steel exhaust pipe, the titanium exhaust pipe has good damping performance and better sound waves and is clear and clear. Therefore, the exhaust sound of the titanium alloy tube is high, and the stainless steel is thick and heavy.

4. The titanium alloy has high cost: the titanium material has high cost, high processing difficulty and difficult stretching,

5. the exhaust pipe manufactured by the traditional customized die is high in cost.

The exhaust pipe made of the two materials has some problems or defects, firstly, the titanium alloy exhaust pipe is difficult to bend due to the fact that the titanium alloy exhaust pipe is determined by physical properties and a production process, and particularly the exhaust pipe with high requirements on pipe direction shape and assembly (commonly called as 'nine bends and eighteen bends') is difficult to process and manufacture due to the restriction factors of different vehicle types, smoke flows and the like. Generally, in the prior art, a pipe is placed on a pipe bending machine and bent and formed by external force, and if the pipe bending precision is insufficient, the exhaust pipe formed by positioning and bending can generate unsmooth exhaust, the phenomenon of exhaust interference is generated, and the exhaust pipe becomes waste. Furthermore, the titanium alloy pipe cannot be bent without limit, the bent parts are uneven in thickness, the grains of the alloy structure are large due to bending and stretching, the gaps among the grains become large, and some parts with large bending degrees cannot bear the impact of high-temperature gas waves of a large accelerator (usually 0.5 +/-0.2 MPa, which is higher instantly), especially under the condition of continuous impact force (such as pulse type accelerator), the bent parts are easy to cause fatigue damage, and the weak areas of the bent parts can be broken through to cause perforation damage in serious cases, so that steam exhaust is ineffective, and safety is influenced. Titanium alloy is more difficult to weld than steel, and has high welding requirements.

SUMMERY OF THE UTILITY MODEL

Based on above-mentioned problem or not enough, the utility model provides a high performance automobile-used titanium alloy blast pipe plans to adopt pure titanium or titanium alloy pipe (pure titanium, TC4, TA 2), cuts apart welding forming method and makes the titanium alloy blast pipe, makes the high temperature resistant air wave impact strength of blast pipe obtain showing and improves, has filled the market blank of automobile-used titanium alloy blast pipe. The specific technical scheme is as follows:

the utility model provides a high performance vehicle titanium alloy blast pipe, including body (1) of titanium alloy blast pipe, characterized by that, have at least one bend on body (1), the radian of bend is A °, the bend is formed by a plurality of tube bends (12-N) through vacuum argon arc welding in turn;

the body (1) further comprises a left side section (L1) and a right side section (L2), and the bending part is arranged at any position between the two ports of the body (1).

The further improvement is that the length L1 of the left section of the exhaust pipe is equal to or unequal to the length L2 of the right section of the exhaust pipe.

The further improvement is that the elbow is formed by linearly cutting a titanium alloy straight pipe according to an inclined cross section, and when the radian of the bending part is A degrees and the number of elbows is X, the radian a = (A/X) ° of a single elbow section; the diameter of the outer diameter of the body (1) is D, the wall thickness is t, and the inner diameter is D-2t; the number of welding seams is X +1;

meanwhile, D is more than or equal to 18t and less than or equal to 22t, and X is more than or equal to 2 and less than or equal to 10.

The further improvement is that the curvature a ° of the bend is 90 °, that when the number of bends X =10, the curvature a =9 ° of the individual bend sections, and when the wall thickness t =2mm, the D =36mm, and the inner diameter is 32mm; the corresponding number of welds is 11.

The further improvement is that the bending radian A degrees is 120 degrees, and when the number of the elbows X =4, the radian a =30 degrees of the elbow section; selecting a wall thickness t =2mm, then D =44mm, and an inner diameter of 36mm; the corresponding number of welds is 5.

Compared with the prior art, the beneficial effects of the utility model include:

1. the utility model discloses a titanium alloy material that mechanical properties is more excellent to based on cutting apart the automobile-used titanium alloy blast pipe of weld forming process production, the bulk strength and the high temperature resistance ability of blast pipe have obtained showing and have improved.

2. The intelligent welding machine is adopted to avoid the problem of inconsistent welding quality of the bending part in manual welding, and the integral equal-strength design method is favorably realized to meet the requirement of weight reduction of the exhaust pipe.

Compared with the integral bending forming method, the integral bending forming method omits a welding process, but has the defect that the bending part is easy to fatigue and damage when the bending part is subjected to the impact load of large throttle high-temperature air waves; the utility model can bear the instantaneous alternating pulse load of 0.5 plus or minus 0.2 MPa.

3. The titanium alloy exhaust pipe is not rusted, has longer service life and is used for the whole life of an automobile, while the stainless steel exhaust pipe is usually rusted within 2 to 3 years, and the service life is generally about 5 to 7 years. Especially the service life of the rust-proof paint is less than 1 to 2 years under the salt spray environment.

4. Compared with stainless steel and bending processes, the titanium alloy exhaust pipe in the same type has higher strength and quality consistency, the average weight reduction rate is more than 45%, and the weight reduction effect is very obvious.

Drawings

The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter, and not limit the subject matter.

FIG. 1 is a schematic view of the present invention;

fig. 2 is a schematic axial cross-sectional view of the present invention;

FIG. 3 is a schematic view of the elbow structure of the present invention;

fig. 4 is a schematic view of the axial section of the elbow of the present invention.

In the figure, A DEG-the radian of the bending part, X-the number of elbows, a-the radian of a single elbow, D-the diameter of the outer diameter, t-the thickness of the pipe wall, L1-the length of the left section of the exhaust pipe, L2-the length of the right section of the exhaust pipe, and N-the ordinal number of the pipe elbow.

Detailed Description

Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to limit the invention, its application, or uses. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be noted that: the relative arrangement of parts and steps set forth in these embodiments should be construed as exemplary only and not as limiting unless otherwise specifically noted.

As shown in fig. 1-4, the structural characteristics of the high-performance titanium alloy exhaust pipe for vehicle of the present invention are clearly shown, and the following implementation process, i.e. the processing technology, is described in detail, and specifically includes the following steps:

s1, preparing materials, namely preparing a TC4 titanium alloy straight pipe with the pipe wall thickness t according to the preset batch requirement;

s2, performing linear cutting, namely performing linear cutting on a TC4 titanium alloy straight pipe into a plurality of pipe elbows, wherein the elbows are formed by linear cutting of the titanium alloy straight pipe according to inclined cross sections, and when the radian of each bent part is A degrees and the number of the elbows is X, the corresponding radian a = (A/X) ° of each elbow section is obtained;

the outer diameter of the body (1) is D, the inner diameter is D-2t, wherein D is more than or equal to 18t and less than or equal to 21t, and X is more than or equal to 2 and less than or equal to 10;

the length L1 of the left section of the exhaust pipe is equal to or unequal to the length L2 of the right section of the exhaust pipe, and is proposed by a customer;

when the radian A DEG of the bending part is 90 DEG and the number of the elbows is X =10, the radian a =9 DEG of a single elbow section, when the wall thickness t =2mm, the D =36mm and the inner diameter is 32mm; the corresponding number of welds is 11.

When the bending radian A degrees is 120 degrees and the number of the bends X =4, the radian a =30 degrees of the bend section; selecting a wall thickness t =2mm, then D =44mm, and an inner diameter of 36mm; the corresponding number of welds is 5.

S3, welding, namely filling argon gas in an argon arc welding box, and connecting a plurality of elbows with ground weld craters in a butt welding mode one by one into an exhaust pipe blank by using an intelligent welding machine and a titanium alloy welding wire with the same mark, wherein the inner diameter size and concentricity of the exhaust pipe blank meet the requirements of batch size;

s4, cleaning the welding seam, cleaning oxide sundries attached to the inner and outer welding seams of the air pipe blank, polishing the outer welding seam to be smooth and bright by using abrasive paper, and honing the inner welding seam by using a deep hole mechanical arm;

and S5, annealing, namely annealing by adopting a vacuum furnace, performing stress relief annealing treatment on the titanium alloy exhaust pipe blank after the welding line is cleaned when the vacuum degree is 0.2-0.6 Pa, wherein the heat preservation temperature in the stress relief annealing treatment process is 550-580 ℃, performing center concentricity correction in a 550 ℃ environment after heat preservation is performed for 1-2 h, and taking out the titanium alloy exhaust pipe blank for air cooling after the titanium alloy exhaust pipe blank is cooled to below 70 ℃ along with the furnace.

And S6, detecting, namely detecting the flaw detection welding line according to the technical requirements of the batch, detecting whether the size and the tolerance meet the technical requirements, and warehousing qualified products.

In addition, the titanium alloy exhaust pipe can also be made of pure titanium or A2, and the performance of the titanium alloy exhaust pipe is equivalent to that of the titanium alloy exhaust pipe made of TC 4.

So far, some specific embodiments of the present invention have been described in detail by way of examples, but it should be understood by those skilled in the art that the above examples are only for illustration and are not intended to limit the scope of the present invention. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope or spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A high-performance titanium alloy exhaust pipe for a vehicle comprises a body (1) of the titanium alloy exhaust pipe, and is characterized by further comprising a left side section (L1), a right side section (L2) and at least one bending part; the bending part is arranged at any position between two ports of the body (1);

the radian of the bending part is A degrees, and the bending part is formed by sequentially welding a plurality of pipe elbows (12-N) through vacuum argon arc welding.

2. The titanium alloy exhaust pipe for the high-performance vehicle as claimed in claim 1, wherein the number of the bent portions is 1 to 3; the left section (L1) and the right section (L2) are equal in length or unequal in length.

3. The titanium alloy exhaust pipe for the high-performance vehicle as claimed in claim 1 or 2, wherein said elbow is formed by linearly cutting a straight titanium alloy pipe in an inclined cross section, and when the radian of said elbow is a ° and the number of elbows is X, the radian a = (a/X) ° of a single said elbow section;

the outer diameter of the body (1) is D, the wall thickness is t, the inner diameter is D-2t, and the number of welding lines is X +1;

4. The high-performance titanium alloy exhaust pipe for the vehicle as claimed in claim 3, wherein the radian A ° of the bent portion is 90 °, the radian a =9 ° of a single bent portion when the number of the bent portions is X =10, D =36mm when the wall thickness t =2mm, and the inner diameter is 32mm; the corresponding number of welds is 11.

5. The high-performance titanium alloy exhaust pipe for the vehicle as claimed in claim 3, wherein a ° is 120 °, and when the number of bends X =4, the radian a of the bend section is =30 °; selecting a wall thickness t =2mm, then D =44mm, and an inner diameter of 36mm; the corresponding number of welds is 5.

6. The high-performance titanium alloy exhaust pipe for the vehicle as claimed in claim 3, wherein the material of the titanium alloy straight pipe is TC4 or TA2.

7. The high-performance titanium alloy exhaust pipe for the vehicle as claimed in claim 3, wherein the material of the titanium alloy straight pipe is replaced by pure titanium.