CN1493863A - Automobile component part antisink property testing method - Google Patents

Abstract

A method for testing the dishing resistance of car part includes installing the part onto test table, marking the tested position on the part, aligning the load applying system with the tested position, applying preload while recording the dishing depth, unloading, applying load and unloading while recording the dishing depth 5 or more times, and repeating the steps of applying pre-load, unloading and recording 1-4 times.

Description

Automobile component part antisink property testing method

Technical field

The present invention relates to automobile component part antisink property testing method, particularly be used for the selection of early stage design phase of automobile and with the outer covering piece dent resistance test method of the specific vehicle in the material optimization field.

Background technology

Developing of automobile industry requires to improve day by day (car is particularly remarkable) to the manufacturing of body of a motor car, and the usability after the vehicle exterior cladding element drawing is more paid close attention to, and dent resistance is an important indicator of its usability of reflection.Auto parts (comprising stamping parts, assembly) are subjected to external applied load (or external energy) effect, the deflection of opposing depression, and the ability size that keeps shape stability is the noise pollution that embodies its surface quality, produces when reducing operation, guarantees the important embodiment of rigidity requirement.Therefore, advanced automobile group has included design objective in to the size of part generation permanent strain under certain load and the height of appointed part rigidity, still do not have at present the dent resistance that unified test method is measured vehicle exterior cladding element in the world, it is blank that domestic research belongs to.

Summary of the invention

The object of the present invention is to provide a kind of dent resistance test method to finish the quantitative measurement assessment of multinomial dent resistance index.

In order to achieve the above object, a kind of automobile component part antisink property testing method of the present invention, comprise the steps: 1 on test platform the installation test part; 2 on testpieces the mark testing position; 3 regulate loading systems makes its perpendicular alignmnet test place; 4 pairs of testpieces apply and preload, and the record cup depth, are unloaded to zero load or near zero load; 5 pairs of testpieces add load, are unloaded to zero load or near zero load, note load value and cup depth; 6 repeating steps more than 5 time; 7 pairs of testpieces apply same preloading; Behind 8 pairs of identical testpieces repeating steps 1 to 4, load continuously in its identical testing position;

In order to achieve the above object, a kind of automobile component part antisink property testing method of the present invention, comprise the steps: 1 on test platform the installation test part; 2 on testpieces the mark testing position; 3 at testing position place experiment with measuring part height; 4 put accurate position with testpieces, and the testpieces plate face that makes the testing position place is perpendicular to pressing sub-strike path; 5 adjust the sub-releasing mechanism height of pressure to institute energy requirement place, and sub-free-falling impact test position is pressed in order; 6 measure and write down the cup depth that forms behind the energy impact.

By above-mentioned dent resistance test method, can obtain repetition, comparable anti-recessed test findings, comprise the cup depth corresponding, initial stiffness, secondary rigidity, final rigidity and fluctuating load with loaded value.The present invention develops vehicle exterior cladding element dent resistance test method, can carry out the dent resistance assessment to the different parts of multiple vehicle, and this improves the vehicle exterior cladding element usability to improving China's car industrial expansion, and attenuate is energy-conservation and production domesticization is significant.

Description of drawings

Fig. 1 is local dent drag test synoptic diagram;

Fig. 2 is anti-recessed rigidity, fluctuating load test synoptic diagram;

Fig. 3 is fluctuating load calculation method figure;

Fig. 4 is the fixed form instance graph of test specimen;

Fig. 5 is a method of addition test report reference chart;

Fig. 6 is a single stage method test report reference chart.

Embodiment

In order to understand characteristics of the present invention, function and effect better, the following preferred embodiment of existing utilization is elaborated also in conjunction with the accompanying drawings.

Elder generation is explained and illustrated for some technical term herein.

Outer covering piece: refer to that of specific vehicle has welded or assembled or the part of application.

Load: the normal load that bear the outer covering piece testing site (N).

Amount of deflection under the load: the plate face bears the total displacement (mm) under the specific load.

Indenture a: permanent plastic deformation that formed by the loading point place.

The indenture degree of depth: the testing site is born specific load and is produced permanent plastic deformation, test front and back position difference, the i.e. degree of depth of permanent plastic deformation.

The local dent drag: the covering opposing produces the ability of permanent strain, comprises the load (N) of the permanent indenture of residual certain depth or applies the degree of depth (mm) that certain load produces permanent indenture.

Rise and fall, also claim flexing: the phenomenon that the plate curvature of face can oppositely be recovered takes place in some areas.

Fluctuating load: the minimum load when fluctuation takes place.

Anti-recessed rigidity: to the shallow shell class covering of certain curvature being arranged, the elastic deformability (N/mm) of its opposing depression amount of deflection.

Embodiment 1

The quasi-static test method

A at first carries out the test of local dent drag as shown in Figure 1---and circular increment is implemented in the testing site load, obtain the local dent drag as required.Its concrete steps are as follows:

A-1 is the installation test part on test platform.

A-2 on testpieces to the testing position mark.

A-3 is clean with testpieces test place cleaning.

Test place of A-4 loading system perpendicular alignmnet.

A-5 applies testpieces and preloads 10N, and the record displacement, and this displacement is the basis displacement value, measures other displacement, is unloaded to zero load or near zero load.

The A-6 testpieces adds load to 50N, and gets back to zero load, notes load one shift value.

The A-7 testpieces adds load to 70N, and gets back to zero load, notes load one shift value.

The A-8 testpieces adds load to 90N, and gets back to zero load, notes load one shift value.

The A-9 testpieces adds load to 110N, and gets back to zero load, notes load one shift value.

The A-10 testpieces adds load to 130N, and gets back to zero load, notes load one shift value.

The A-11 testpieces adds load to 150N, and gets back to zero load, notes load one shift value.

The A-12 testpieces adds load to 170N, and gets back to zero load, notes load one shift value.

The A-13 testpieces adds load to 190N, and gets back to zero load, notes load one shift value.

The A-14 testpieces adds load to 210N, and gets back to zero load, notes load one shift value.

A-15 replys and preloads 10N.

A-16 calculates load, and the corresponding numerical value of the power that promptly caves in and cup depth is as shown in the table.

Depression power (N)	Cup depth (mm)	Rise to the displacement (mm) that preloads under the 10N after this circulation	Preload the displacement (mm) under the 10N
				????50	????0.004	????0.094	????0.09
????70	????0.006	????0.096	????0.09
				????90	????0.008	????0.098	????0.09
????110	????0.012	????0.102	????0.09
				????130	????0.02	????0.11	????0.09
????150	????0.108	????0.198	????0.09
				????170	????0.478	????0.568	????0.09
????190	????0.586	????0.676	????0.09
				????210	????0.682	????0.772	????0.09

B such as Fig. 2, shown in Figure 3 carry out cup depth, the analysis of depression load data

B-1 fluctuating load

As shown in Figure 3, " fluctuating " behavior has two kinds, first kind of fluctuation is for pressing sub-indentation test spare plate face, initial deflection is followed after the load monotone increasing adds, load takes place to descend suddenly, be called " the hard fluctuating ", that load that load one displacement curve slope is arrived for the first time zero place is defined as fluctuating load.Second kind of fluctuation shows as load one displacement curve slope part and reduces to minimum, but remain on the occasion of, this is called " soft fluctuating ", the load that load one displacement curve slope is reached the minimum value place is defined as fluctuating load.

Fluctuating is that a kind of geometric configuration, reinforcement with part arranged and plate surface bearing related phenomena, therefore, the fluctuating load that measures on a testpieces panel is different with the fluctuating load that measures on assembly or car load, thereby, for guaranteeing that method of addition does not have influence on the measurement of fluctuating load in any permanent strain of plate face formation, suggestion only adopts the method for single loaded cycle to measure fluctuating load, and the maximum load of this single cycle should or be sufficiently high to less than 225N and produce the numerical value that rises and falls.Usually some data smoothing technology (such as batten technology or Loess technology) can obtain the differentiation function of the clear definition of load one displacement curve, please indicate the treatment technology of employing.

The fluctuating load measurement

The curve map of load one displacement curve differential (derivative value) value and displacement (dF/d δ-δ) draws first.If dF/d δ vs δ curve minimum is a negative value, then (minimum displacement line, the load value of dF (d δ=0) intersection correspondence is exactly hard fluctuating load herein for this curve and horizontal line.If dF/d δ vs δ curve minimum be always on the occasion of, then the corresponding load of this minimum value is exactly soft fluctuating load.

Whether serious for measuring soft fluctuating, some testpieces panel can rise and fall at several load place, needs all fluctuations are listed in the result.

The B-2 initial stiffness

As shown in Figure 2, in load one displacement curve initial linear section, 20%-80% linearity range data are obtained with Least Square in Processing.

B-3 secondary rigidity

As shown in Figure 2, fluctuating load on load one displacement curve, is chosen linearity range 20% to 60% after taking place, and uses Least Square in Processing.

The final rigidity of B-4

As shown in Figure 2, final rigidity refers to the before last that part of slope of maximum load arrival on load one displacement curve.

Stiffness calculating methods is as follows:

F1(0.966mm，13.60N)

F2(4.374mm，57.40N)

$K1=\frac{57.40-13.60}{4.374-0.966}$

$=12.867$

S1(6.722，82.30)

S2(7.516，89.80)

$K2=\frac{89.80-82.30}{7.516-6.722}$

$=9.502$

Wherein K1 is first rigidity, and K2 is second rigidity.

C record and report

Following table 1 provides the test report form that this test method needs, and is for reference.

Test speed: sample clamps:

Testing position	Load (N)	Cup depth (mm)	Initial stiffness (N/mm)	Fluctuating load (N)	Secondary rigidity (N/mm)	Final rigidity (N/mm)

Table 1. test report specimen page

As Fig. 5, shown in Figure 6,, funtcional relationship, fluctuating load, first rigidity and second rigidity of power and distortion have been drawn for test findings report chart.

Embodiment 2

Dynamic test method

The A test procedure is as follows:

A-1 is the installation test part on test platform;

A-2 is the mark testing position on testpieces;

A-3 is clean with testpieces test place cleaning;

A-4 is at testing position place experiment with measuring part height;

A-5 is put accurate position with testpieces, and the testpieces plate face that makes the testing position place is perpendicular to pressing sub-strike path;

A-6 adjusts and presses sub-releasing mechanism height to institute energy requirement place, and sub-free-falling impact test position is pressed in order;

A-7 measures and writes down the cup depth that forms behind the energy impact.

The B data analysis

The testpieces performance characteristic only is cup depth and Impact energy.

Explanation for above two embodiment test

1 replicated experimental units

Because this test can be used for new design elements, consider the restriction of testpieces processing and cost, a part is made in the design phase suggestion, as recommending to repeat to do three component tests.2

The fixed form of 2 test specimens is seen Fig. 4.

1) outer covering piece (the maximum curvature plane overlaps with swinging plane) in place on test platform.

2) position, testing site is determined.

3) testpieces should be fixed on the rigid support, adopts metal platen at the flanging and the outside, margin plate face place, and the inboard metallic carrier rod that adopts is fixed testpieces by dial torque wrench every about a determining deviation.Strict control testpieces boundary conditions helps the repetition and the unification of test condition, the stability of test findings.

3 testing positions

Most of testpieces will be tested in a plurality of positions, for guaranteeing that the distortion of plate face on every side of each recessed position does not influence the test findings of another recessed position, advise 200 millimeters at least at interval at two testing position places, to the position of dent resistance requirement is arranged, the needs of testpieces geometric configuration are selected testing position according to the user.For example:

Door-plate: door handle place hand is by the impression that forms.

Rear fender: the collision of supermarket small handcart may impaired place.

Protecgulum or bonnet: the impression that hand forms when closing.

Wing: due to ancon is stressed.

Claims (9)

1. an automobile component part antisink property testing method is characterized in that, comprises the steps:

1-1 is the installation test part on test platform;

1-2 is the mark testing position on testpieces;

1-3 regulates loading system and makes its perpendicular alignmnet test place;

1-4 applies testpieces and preloads, and the record cup depth, is unloaded to zero load or near zero load;

1-5 adds load to testpieces, is unloaded to zero load or near zero load, notes load value and cup depth;

1-6 repeating step 1-5 many times;

1-7 applies same preloading to testpieces;

1-8 to identical testpieces repeating step 1-1 to 1-4 after, load continuously in its identical testing position;

2. automobile component part antisink property testing method as claimed in claim 1 is characterized in that, can test place cleaning is clean behind described step 1-2, carry out step 1-3 again.

3. automobile component part antisink property testing method as claimed in claim 1 or 2 is characterized in that, each added load value of repeating step 1-5 is all greater than added load value of last time.

4. automobile component part antisink property testing method as claimed in claim 1 or 2, it is characterized in that the installation of testpieces should be fixed on the rigid support, adopt pressing plate at the flanging and the outside, margin plate face place, the inboard push rod that adopts is fixed testpieces by dial torque wrench every about a determining deviation.

5. automobile component part antisink property testing method as claimed in claim 1 or 2 is characterized in that, but described testpieces revision test repeatedly, and the interval between each testing position is at least 200 millimeters.

6. an automobile component part antisink property testing method is characterized in that, comprises the steps:

6-1 is the installation test part on test platform;

6-2 is the mark testing position on testpieces;

6-3 is at testing position place experiment with measuring part height;

6-4 is put accurate position with testpieces, and the testpieces plate face that makes the testing position place is perpendicular to pressing sub-strike path;

6-5 adjusts and presses sub-releasing mechanism height to institute energy requirement place, and sub-free-falling impact test position is pressed in order;

6-6 measures and writes down the cup depth that forms behind the energy impact.

7. automobile component part antisink property testing method as claimed in claim 6 is characterized in that, can test place cleaning is clean behind described step 6-2, carry out step 6-3 again.

8. as claim 6 or 7 described automobile component part antisink property testing methods, it is characterized in that the installation of testpieces should be fixed on the rigid support, adopt pressing plate at the flanging and the outside, margin plate face place, the inboard push rod that adopts is fixed testpieces by dial torque wrench every about a determining deviation.

9. as claim 6 or 7 described automobile component part antisink property testing methods, it is characterized in that, but described testpieces revision test repeatedly, the interval between each testing position is at least 200 millimeters.

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