1. A method for determining a pipe welding heating standard for a suspension stabilizer bar is characterized by comprising the following process flows of:

s1: testing the welding power by a comparison method according to the characteristics of the material, and determining the welding heating temperature of the material;

s1.1: respectively heating and welding the materials at high temperature, medium temperature and low temperature;

s2: forming and welding the cut by adopting an orthogonal test, and determining welding process parameters of the material;

s2.1: the orthogonal test is carried out for a plurality of times according to factors in a test factor level table, wherein the factor level table comprises a plurality of factors, and the factor A: welding power, factor B: welding speed and factor C: the amount of extrusion;

s2.2: according to the fluctuation condition of the calculation result, namely comparing the magnitude of the range values R of different factors, determining the importance degree of the corresponding index on the comprehensive mechanical property of the welding line, and further finding out better welding process parameters;

s3: the fatigue resistance of the finished product was investigated by comparative methods, including comparative metal flow line angles and fusion line widths.

2. The method of determining a pipe welding heating standard for a suspension stabilizer bar according to claim 1, characterized in that: in step S1, the material properties include hardenability and creep strength.

3. The method of determining a pipe welding heating standard for a suspension stabilizer bar according to claim 2, characterized in that: in step S1.1, high temperature means that the heating state is trace spark splash, medium temperature means that the heating state is trace spark splash, and low temperature means that the heating state is no spark splash.

4. The method of determining a pipe welding heating standard for a suspension stabilizer bar according to claim 3, characterized in that: in the step S1, the welding heating temperature of the final material is determined by a destructive crush test and a microscopic metallographic detection method after welding.

5. The method of determining a pipe welding heating standard for a suspension stabilizer bar according to claim 4, characterized in that: in step S2.1, nine tests are used.

6. The method of determining a pipe welding heating standard for a suspension stabilizer bar according to claim 5, characterized in that: in step S2.2, the calculation results of the indexes are obtained by mathematically adding the test results of the corresponding positions of the levels in the test result table according to the factor a column in table 2, and respectively representing the sum of level 1, level 2 and level 3 by using the sum of T1, T2 and T3.

7. The method of determining a pipe welding heating standard for a suspension stabilizer bar according to claim 6, characterized in that: the material adopts 26MnB5 coiled sheet.

Background

With the rapid development of the automobile manufacturing industry, people have more and more deep knowledge on the limitations of the domestic assembly production mode of imported parts which are prevalent in the initial development stage of the automobile industry, so that the localization of a large amount of raw materials is realized, and the method becomes an effective way for reducing the cost and enhancing the market competitiveness.

With the improvement of the performance of raw materials and the improvement of production process, a plurality of original accessories using steel plates and round steel as raw materials gradually start to adopt welded pipes as materials, so that the weight of the accessories can be obviously reduced, the vehicle weight is reduced, and the oil consumption is saved; on the other hand, the production process can be simplified, and the product performance can be improved. In foreign countries, a large amount of welded pipes have been adopted to replace round steel for producing stabilizer bars for suspensions of middle and high-end automobiles, so that a heating standard for determining the welded pipes for the automobile manufacturing industry is urgently needed, and the development of the automobile spare and accessory industry is promoted.

The published Chinese invention patent, application number CN201110286982.1, patent name: a stabilizer bar for suspension, the application date: 2011-09-23, the invention relates to a stabilizer bar for a suspension, and belongs to the field of automobiles. The stabilizer bar is connected with the two control arm assemblies to form a suspension bearing structure, the stabilizer bar comprises a cross arm and two longitudinal arms symmetrically arranged at two ends of the cross arm, a stabilizer bar bushing assembly is arranged on the cross arm and used for fixing the stabilizer bar on a vehicle body, the two longitudinal arms are arranged in a plane perpendicular to the cross arm, and the tail end of each longitudinal arm is fixedly connected with the corresponding control arm assembly. The embodiment of the invention only uses two parts of the stabilizer bar and the control arm assembly to realize the functions of the original four parts, namely the front stabilizer bar, the control arm assembly, the thrust rod and the connecting rod, simplifies the triangular arm structure, greatly lightens the weight of the front suspension assembly, simplifies the assembly process, directly reduces the design cost and the production cost, and increases the convenience for after-sale maintenance.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a method for determining a pipe welding heating standard for a suspension stabilizer bar, which comprises the following process flows of:

s1: testing the welding power by a comparison method according to the characteristics of the material, and determining the welding heating temperature of the material;

s1.1: respectively heating and welding the materials at high temperature, medium temperature and low temperature;

s2: forming and welding the cut by adopting an orthogonal test, and determining welding process parameters of the material;

s2.1: the orthogonal test is carried out for a plurality of times according to factors in a test factor level table, wherein the factor level table comprises a plurality of factors, and the factor A: welding power, factor B: welding speed and factor C: the amount of extrusion;

s2.2: according to the fluctuation condition of the calculation result, namely comparing the magnitude of the range values R of different factors, determining the importance degree of the corresponding index on the comprehensive mechanical property of the welding line, and further finding out better welding process parameters;

s3: the fatigue resistance of the finished product was investigated by comparative methods, including comparative metal flow line angles and fusion line widths.

Preferably, in step S1, the material characteristics include hardenability and creep strength.

Preferably, in step S1.1, high temperature means that the heating state is a trace amount of spark spattering, medium temperature means that the heating state is a trace amount of spark spattering, and low temperature means that the heating state is a no-spark spattering.

Preferably, in step S1, the welding heating temperature of the final material is determined by destructive flattening test and microscopic metallographic detection method after welding.

Preferably, in step S2.1, nine trials are used.

Preferably, in step S2.2, the calculation results of the indexes are obtained by mathematically adding the test results of the corresponding positions of the levels in the test result table according to the factor a column in table 2 and respectively representing the sum of level 1, level 2 and level 3 by the symbols T1, T2 and T3.

Preferably, the material is 26MnB5 coiled sheet.

The invention has the beneficial effects that:

determining forming parameters and welding parameters by controlling a post-welding flattening test result and a metallographic test result; the welded pipe for the suspension stabilizer bar, which has the advantages of good bending processing technology, strong torsion resistance and good fatigue performance, is produced, and finally the product yield is realized.

Detailed Description

In order to make the technical solutions of the present invention better understood and make the above features, objects, and advantages of the present invention more comprehensible, the present invention is further described with reference to the following examples. The examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.

As shown in tables 1-2, the present invention comprises the following process flow:

s1: testing the welding power by a comparison method according to the characteristics of the material, and determining the welding heating temperature of the material;

s1.1: respectively heating and welding the materials at high temperature, medium temperature and low temperature;

s2: forming and welding the cut by adopting an orthogonal test, and determining welding process parameters of the material;

s2.1: the orthogonal test is carried out for a plurality of times according to factors in a test factor level table, wherein the factor level table comprises a plurality of factors, and the factor A: welding power, factor B: welding speed and factor C: the amount of extrusion;

s2.2: according to the fluctuation condition of the calculation result, namely comparing the magnitude of the range values R of different factors, determining the importance degree of the corresponding index on the comprehensive mechanical property of the welding line, and further finding out better welding process parameters;

s3: the fatigue resistance of the finished product was investigated by comparative methods, including comparative metal flow line angles and fusion line widths.

In this embodiment, the characteristics of the material in step S1 preferably include hardenability and creep strength.

In this embodiment, preferably, in step S1.1, high temperature means that the heating state is a trace amount of spark spattering, medium temperature means that the heating state is a trace amount of spark spattering, and low temperature means that the heating state is a no-spark spattering state.

In this embodiment, in step S1, the welding heating temperature of the final material is determined by destructive crush test and microscopic metallographic detection after welding.

In this embodiment, preferably, nine tests are used in step S2.1.

Following the above procedure, table 1 below is a table of test factor levels:

TABLE 1 test factor level table

The following table 2 is an orthogonal test scheme:

TABLE 2 orthogonal test protocol

In this embodiment, step S2.2 is preferably to add the test results of the corresponding positions of the levels in the test result table according to the factor a column in table 2, and to use the sums of the levels T1, T2 and T3 to represent level 1, level 2 and level 3, respectively, to obtain the calculation results of the indexes.

In the present embodiment, the material is preferably 26MnB5 rolled sheet.

The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of this patent application.