CN102650583A - Beryllium bronze leaf spring normal-temperature and high-temperature stress relaxation testing device and testing method thereof - Google Patents
Beryllium bronze leaf spring normal-temperature and high-temperature stress relaxation testing device and testing method thereof Download PDFInfo
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- CN102650583A CN102650583A CN2012101235359A CN201210123535A CN102650583A CN 102650583 A CN102650583 A CN 102650583A CN 2012101235359 A CN2012101235359 A CN 2012101235359A CN 201210123535 A CN201210123535 A CN 201210123535A CN 102650583 A CN102650583 A CN 102650583A
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Abstract
The invention provides a beryllium bronze leaf spring normal-temperature and high-temperature stress relaxation testing device and a testing method thereof. A side plate is fixed at the front side of a base of the testing device, a sample is an equal stress sample, which is provided with an opening at one end and is fixed on the upper side of the side plate, the base and the upper plate are fixed together through two limiters, a pressure sensor and a pressure head are fixed under the upper plate, and the pressure head is in line contact with the sample. Based on the testing device, the testing method comprises the following steps of: firstly preparing the equal stress sample, then determining the vertical distance difference between the limiters and the side plate, and arranging the testing device and the sample according to the distance difference; and then carrying out a spring stress relaxation test and acquiring stress values at different time, and determining the stress relaxation loss condition of a beryllium bronze leaf spring sample to be tested after the regulated test time is up. The device disclosed by the invention is simple in design, is not deformed at high temperature, is easy to process and has high measuring precision, the test data is accurate, continuous stress measurement of the beryllium bronze leaf spring test is realized, personal errors are reduced, and the work efficiency is improved.
Description
Technical field
The invention belongs to beryllium-bronze sheet spring normal temperature and high-temperature stress relaxation technical field of measurement and test, be specifically related to the testing apparatus and the measuring method thereof of a kind of beryllium-bronze sheet spring normal temperature and high-temperature stress relaxation.
Background technology
Beryllium-bronze has good mechanical property, wear-resisting fatigue performance, higher intensity and hardness, good electric conductivity, corrosion stability, low temperature is nonmagnetic, impact producing no spark property and good shop characteristic.In national defence, aviation and instrument, measurement instrument industry, be widely used.The quality of beryllium-bronze is its limit of elasticity and relaxation stability decision.Stress relaxation is meant temperature one regularly, the phenomenon that the resilient material of working under the constant strain condition, stress descend in time gradually, the i.e. phenomenon that reduces gradually in time of elastic force.It greatly influences precision, reliability and the life-span of flexible member.Stress relaxation does not exist only in the flexible member of work under the HTHP, and is present in the part of long-term work under the room temperature.The ability of material opposing stress relaxation is an important mechanical index of its stability of evaluation under the high temperature, is called relaxation stability.
The test method of present evaluation beryllium-bronze stress relaxation ability mainly contains the ring-shaped sample method and the beam type bending stress is lax; Though ring-shaped sample method simple economy; Test efficiency is high; But because it can not directly reflect the stress relaxation characteristics of test material, and sample is difficult to processing, and there is certain limitation in this method.At present general beam type bending stress is lax to be to adopt bolt to add load measuring method, and as shown in Figure 1, sample is fixed on the pedestal through fixed block, and sample institute is stressed to realize through the amount of deflection screw rod.This method automaticity is lower, and error is relatively large, and can not realize being with temperature measurement, because the limitation of device itself need be fixed through other stationary installations.Increase labor capacity to a great extent, increased the complicacy and the instability of device.
Summary of the invention
The test of beryllium-bronze springs normal temperature and high-temperature stress relaxation exists sample to be difficult to processing in the prior art in order to solve in the present invention; The problem that can not directly reflect the stress relaxation characteristics of test material; And the automaticity of method of testing existence at present is lower; Measuring error is bigger, and can not realize being with problems such as temperature measurement, and the testing apparatus and the measuring method thereof of a kind of beryllium-bronze sheet spring normal temperature and high-temperature stress relaxation is provided.
The testing apparatus of a kind of beryllium-bronze sheet spring normal temperature and high-temperature stress relaxation comprises: base, limiter, upper plate, pressure transducer, pressure head and side plate.Upper plate be flat on base directly over; Base is vertical corresponding with the center of upper plate; The center of upper plate has central through hole; Have left through hole and right through hole in the symmetrical position of central through hole, on the base on the vertical corresponding upper plate position of left through hole and right through hole have left counterbore and right counterbore.Between the left counterbore of base and upper plate left side through hole, left limiter is installed, between the right through hole of the right counterbore of base and upper plate, right limiter is installed.Through being bolted on upper plate left side through hole or the right through hole, the lower end is separately fixed in the left counterbore or right counterbore of base respectively for the two ends band external thread of left and right limiter, limiter upper end.Pressure transducer and pressure head are between base and upper plate; Pressure transducer is connected with the data presentation instrument through sensor lead, and the upper end of pressure transducer is fixed on the central through hole of upper plate, and the lower end is fixed with pressure head.Pressure head contacts with beryllium-bronze sheet spring to be measured.Side plate is fixed on the front side of base, being centered close on the same horizontal line of the center of the downside of side plate and the downside of base; The center of the upside of side plate has counterbore, is used for fixing an end of springs perforate to be measured.Described beryllium-bronze sheet spring to be measured is the equal stress sample, and an end has the hole.
The method of testing of a kind of beryllium-bronze sheet spring normal temperature and high-temperature stress relaxation, realize through following steps:
Step 1.1: blanking, stress relaxation test material are beryllium-bronze.
Step 1.2: the material warp is cut into the equal stress sample; Described equal stress sample has the rectangular end of perforate, stressed horizontal segment, and the trapezoidal sections that connects rectangular end and horizontal segment.
Step 1.3:, reach the mechanical state of regulation with the Ageing Treatment that beryllium-bronze sheet spring sample to be measured is stipulated.
Step 2.1: will set the crooked primary stress of reed and bring the initial deflection computing formula into, and confirm the vertical drop of limiter and side plate.
Step 2.2: installation testing equipment; Described testing apparatus comprises: base, limiter, upper plate, pressure transducer, pressure head and side plate; In when assembling, at first, side plate is fixed on the front side of base, said side plate and base, being centered close on the same vertical horizontal line of the downside of the two; Secondly, with an end of beryllium-bronze sheet spring sample to be measured perforate through in the center counterbore that is bolted to the side plate upside; Then, pressure head is fixed on the lower end of pressure transducer, the upper end of pressure transducer is fixed on the central through hole of upper plate, pressure transducer is positioned at the downside of upper plate; At last, assembling limiter, left counterbore that base has and right counterbore; The left through hole and the right through hole of the vertical corresponding upper plate of difference; The left through hole of described upper plate and right through hole are with respect to the central through hole left-right symmetric of upper plate, and base is vertical corresponding with the center of upper plate, the left limiter of assembling between the left counterbore of base and upper plate left side through hole; The right limiter of assembling between the right through hole of the right counterbore of base and upper plate; The two ends band external thread of said limiter, lower end are fixed in the left counterbore or right counterbore of base, and the upper end is through being bolted on upper plate left side through hole or the right through hole.
Step 2.3: the sensor lead that will connect pressure transducer links to each other with external data presentation instrument; And the power lead and the power supply of data presentation instrument joined, be under zero test mode at described measuring equipment the data Displaying Meter is returned to zero and range calibration.
Step 2.4: tighten the nut of and arranged on left and right sides stationary restraint on the upper plate, guarantee as far as possible in the rundown process that beryllium-bronze sheet spring sample to be measured both sides are stressed evenly, after the data stabilization of pending data Displaying Meter, read primary stress.
Advantage of the present invention and good effect are:
(1) test equipment designs of the present invention is easy, and is indeformable under the high temperature, and it is high to be easy to processing and measuring accuracy; Realized beryllium-bronze sheet spring test stress continuous coverage at a certain temperature; The sample one-step installation need not unloading midway until EOT, has reduced personal error.Owing to adopted high-precision pressure survey sensor and highly sensitive digital display instrument, thereby improved the precision of measurement data.Used pressure survey sensor can adopt high-temperature-resistance pressure sensor according to request for utilization, realizes the continuous coverage purpose in the temperature required scope.
(2) pressure transducer of testing apparatus of the present invention and method of testing employing and the sensor lead of output all are applicable to hot conditions, so the present invention can carry out the beryllium-bronze sheet spring stress relaxation test under the high temperature.
(3) method of definite stress at present commonly used and Deflection Relationship is when applying various amount of deflection level to sample; Obtain a strain-sag curve with strainmeter; Confirm the stress-strain behavior of material to utilize this characteristic to set up sag with axial test, produce desired stress application.The present invention need not confirm stress and Deflection Relationship, the sample sag that is difficult for measuring is converted into the electric signal that is prone to measurement.In addition; Measuring method at present commonly used is the temperature that sample is put into setting; Place certain hour, remove sample from its anchor clamps then, measure the permanent strain that produces with optical comparator; Be converted into loss stress to permanent strain then, and method of testing of the present invention need not be converted into loss stress with permanent strain.Therefore, compare prior art, adopt method of testing of the present invention simpler.
(4) sample that the present invention adopted is the equal stress sample, has guaranteed not produce in the sample BENDING PROCESS lateral thrust; The specimen size design avoids producing because clamping loads the influence of the termination effect belt that brings; Every part of sample all is the equal stress state, is easy to test and analysis, can consider the relation of beryllium-bronze stress relaxation and creep based on this experiment.
Description of drawings
Fig. 1 is the synoptic diagram of beryllium-bronze reed stress relaxation measuring equipment commonly used in the prior art;
Fig. 2 is the front elevation of the general assembly drawing of testing apparatus of the present invention;
Fig. 3 is the synoptic diagram of upper plate in the testing apparatus of the present invention: a is a vertical view, and b is A-A directional profile figure;
Fig. 4 is the synoptic diagram of base in the testing apparatus of the present invention: a is a vertical view, and b is B-B directional profile figure, and c is front view or rear view;
Fig. 5 is the structural representation of testing apparatus latus inframedium of the present invention: a is a front view, and b is a vertical view;
Fig. 6 is the structural representation of limiter in the testing apparatus of the present invention;
Fig. 7 is the structural representation of pressure transducer in the testing apparatus of the present invention;
Fig. 8 is the structural representation of pressure head in the testing apparatus of the present invention: a is a front view, and b is a side view;
Fig. 9 is the structural representation of cushion block in the testing apparatus of the present invention;
Figure 10 is the specimen shape figure of the present invention's beryllium-bronze sheet to be measured spring sample;
Figure 11 is the flow chart of steps of the method for testing of beryllium-bronze sheet spring normal temperature of the present invention and high-temperature stress relaxation.
Embodiment
The detailed explanation of the present invention being carried out below in conjunction with accompanying drawing.
The present invention provides the testing apparatus of a kind of beryllium-bronze sheet spring normal temperature and high-temperature stress relaxation, and is as shown in Figure 2, mainly comprises following several module: base 1, limiter 2, upper plate 3, pressure transducer 4, pressure head 5 and side plate 6.
As shown in Figure 2, upper plate 3 be flat on base 1 directly over, base 1 is corresponding with the center of upper plate 3.Two limiters 2 were fixed together about base 1 passed through with upper plate 3.On the center of a side of the relative base 1 of upper plate 3, be fixed with pressure transducer 4, the other end of pressure transducer 4 is fixed with pressure head 5.Pressure transducer 4 is connected with external data presentation instrument through sensor lead 8, gives external data presentation instrument with the pressure transmission of the pressure head of measuring 5.Be fixed with side plate 6 in the front side of base 1, an end of beryllium-bronze sheet spring to be measured has the hole, and through being bolted on the side plate 6, the other end of beryllium-bronze sheet spring to be measured is a free end.In test time, after springs to be measured placed, pressure head 5 is pressed on the optional position of free-ended horizontal segment AB of beryllium-bronze sheet spring to be measured, and was shown in figure 10.
Shown in a and b of Fig. 3, the center on the upper plate 3 has through hole 32, is used for fixing pressure transducer 4, respectively has a through hole 31 in central through hole 32 symmetrical positions, is used to assemble limiter 2.On the transverse horizontal line that was centered close to central through hole 10 of left and right two through holes 31 shown in a of Fig. 3.
Shown in a and b of Fig. 4, the upside of base 1, the position of the left and right through hole 31 of vertical corresponding upper plate 3 respectively has two counterbores 11, is used for an end of stationary restraint 2 is fixed on lower plate 1, guarantees that lower plate 1 is smooth.Shown in the c of Fig. 4, the front side of base 1 has two holes 12, is used for fixing side plate 6.
Shown in a of Fig. 5, have two holes 12 that open corresponding base 1 front side, position of 61, two through holes 61 of two through holes in the side of side plate 6, can side plate 6 be fixed on the base 1 through screw.Shown in the b of Fig. 5, have counterbore 62 in the center of the upside of side plate 6, be used for fixing an end of beryllium-bronze sheet spring to be measured perforate.In order to make beryllium-bronze sheet spring to be measured more firm at the trial, near a week of counterbore 62, also evenly have 4 counterbores 63, be used for fixing beryllium-bronze sheet spring to be measured.When fixing beryllium-bronze sheet spring to be measured, be placed on beryllium-bronze sheet spring perforate one end to be measured with a cushion block III, through bolt cushion block III, beryllium-bronze sheet spring to be measured and side plate 6 are fixed together.The structure of cushion block III is as shown in Figure 9.
As shown in Figure 6; The two ends band external thread of limiter 2; Pass the through hole 31 on upper plate 3 left sides or the right at a last end, and limiter 2 is fixing with upper plate 3 with nut, limiter 2 under an end be fixed in the counterbore 11 of through hole 31 on vertical corresponding upper plate 3 left sides or the right on the lower plate 1.Limiter 2 adopts stainless steel material to process, and its height decides according to the deflection deformation rate of sheet spring, is compressed to the height value of regulation in order to guarantee sample, produces constant deformation, and its height allowable tolerance is 0.02mm.
As shown in Figure 7, the two ends band external thread of pressure transducer 4, pressure transducer 4 pass the central through hole 11 of upper plate 3 at a last end; And be fixed on the upper plate 3 through nut; Under an end pressure head 5 has been installed, be used to avoid the bolt springs direct and to be measured of pressure transducer 4 to contact, cause stress distribution uneven; And avoid springs hot mastication reblocking pressure transducer 4 to be measured, the problem that 4 serviceable lifes of build-up of pressure sensor and test accuracy descend.The head of the end that pressure transducer 4 is connected with pressure head 5 is a polished rod, and it is for fear of following situation that one section polished rod is set: thereby owing to use repeatedly and cause thread abrasion to cause the gap that contacts between pressure transducer 4 and the pressure head 5, and then influence measuring accuracy.The specification of the pressure transducer of being selected for use in the testing apparatus of the present invention is kz β k-1, and accuracy grade is 0.001, and output sensitivity is 2.248mV/V, and temperature range is 0 ℃～150 ℃, and range is 980N.Pressure transducer 4 is anodal through the outer power supply source input end transparent thread of data presentation instrument that sensor lead 8 connects, and the black negative utmost point, instrument input end yellow line are anodal, and white line is a negative pole.Pressure transducer 4 measuring accuracy in the testing apparatus of the present invention reach per mille, and temperature is floated little and can at high temperature be kept good precision.
As shown in Figure 8, pressure head 5 is fixed on the pressure transducer 4 through internal thread.Corresponding to the polished rod that pressure transducer 4 one ends are provided with, there is one section smooth section too in the internal thread in the pressure head 5, shown in a of Fig. 8.The polished rod that pressure transducer one end is set in the embodiment of the invention is 3-5mm, and is same, and the position bottom internal thread is in the corresponding pressure head 5 is provided with the smooth section of 3-5mm.Between pressure transducer 4 and sample, be provided with a pressure head 5 is installed; It is uneven to have avoided pressure transducer 4 bolts directly to contact the stress distribution that causes with sample; Also avoided metallic high temperature to soften reblocking pressure transducer 4, the problem that 4 serviceable lifes of build-up of pressure sensor and test accuracy descend.In addition; To tested object is beryllium-bronze sheet spring to be measured; Pressure head 5 contacts with the horizontal segment line of beryllium-bronze sheet spring to be measured, make that the stressed position of tested springs is a line, and the width of pressure head 5 (length of line just) is greater than the width of the horizontal segment of beryllium-bronze sheet to be measured; Avoid spring because test causes problems such as crimping, make that test is more accurate.
For making present device have versatility, design cushion block I and III, as shown in Figure 9, be a rectangle, the center has through hole, on the circumferencial direction of through hole, also evenly has four through holes.Cushion block I is used for the auxiliary desired load that is provided with; The diameter of central through hole that cushion block I is set is greater than limiter 2 upper end diameter; Needs according to test; In the upper end and upper plate 3 joints of two limiters 2, put the cushion block I of same thickness, change pressure head 5 and give beryllium-bronze sheet spring to be measured institute applied pressure.The diameter in the diameter of the center counterbore 62 that the diameter of the central through hole of cushion block III and side plate 6 upper sides are opened, the hole that beryllium-bronze sheet spring perforate end to be measured is opened is identical; When beryllium-bronze sheet spring to be measured is installed; With cushion block III be placed on beryllium-bronze sheet spring perforate end to be measured above, through bolt cushion block III and beryllium-bronze sheet spring perforate end to be measured are fixed on side plate 6 upper sides.
Shown in figure 10, for adopting the shape of the used beryllium-bronze sheet spring sample to be measured of testing apparatus of the present invention, every part of sample all is the equal stress state.One end of beryllium-bronze sheet spring to be measured has the hole.In the embodiment of the invention, the sample entire length that is adopted is 52.4mm, and perforate one end is a rectangular shape, the wide 10mm of rectangle, and long 20mm, the width of horizontal segment AB are 2mm, the angle on two waist limits of the trapezoidal sections of connection perforate rectangular end and horizontal segment AB is 18.7 degree.
The present invention is based on above-mentioned testing apparatus, the method for testing of a kind of beryllium-bronze sheet spring normal temperature and high-temperature stress relaxation also is provided, shown in figure 11, mainly comprise the steps:
Step 2.1: will set the crooked primary stress of reed and bring the initial deflection computing formula into, and confirm the vertical drop of limiter 2 and side plate 6.The computing formula of initial deflection is:
Wherein, f representes the initial deflection value, and unit is a millimeter (mm); L representes the gauge length of spring sample to be measured, and unit is mm; σ representes spring sample to be measured top layer maximum stress, and unit is MPa; H representes the thickness of spring sample to be measured, and unit is mm; E representes the elastic modulus of spring sample material to be measured, and unit is MPa.Desirable 0.5 σ of σ wherein
e, 0.5 σ
0.2Or 0.8 σ
e, σ
0.2The expression yield strength, σ
eThe expression limit of elasticity.The present invention chooses 0.5 σ here
0.2, the present invention adopts this value, can access more initial degree of disturbing, thereby confirms a difference in height that is fit to test.
Step 2.2: installation testing equipment.Side plate 6 is fixed on the base 1, then sample is fixed on the side plate 6.Afterwards two left and right limiters 2 are fixed on the base 1, then pressure transducer 4 are connected the back overall fixed on upper plate 3 with pressure head 5, through limiter 2 upper plate 3 and base 1 are fixed together at last.
Beryllium-bronze sheet spring sample to be measured is fixed on 6 last times of front side board, with cushion block III be placed on beryllium-bronze sheet spring sample perforate one end to be measured above, through bolt cushion block III and beryllium-bronze sheet spring sample perforate one end to be measured are fixed on the front side board 6 then.
During assembling limiter 2; The vertical drop that need obtain according to step 2.1; The downside of adjustment upper plate 3 is apart from the vertical range of the upper side of side plate 6; When the insufficient height of limiter 2, through the cushion block I that same thickness is set between two limiters 2 and upper plate 3 reach the height that will set; Described cushion block I has thickness and the center has through hole, and the diameter of through hole is greater than the diameter of limiter 2 upper ends.
Step 2.3: the sensor lead that will connect pressure transducer links to each other with external data presentation instrument; And the power lead and the power supply of data presentation instrument joined, be under zero test mode at described measuring equipment the data Displaying Meter is returned to zero and range calibration.
Step 2.4: tighten the nut of and arranged on left and right sides stationary restraint on the upper plate, guarantee as far as possible in the rundown process that beryllium-bronze sheet spring sample to be measured both sides are stressed evenly, after the data stabilization of pending data Displaying Meter, read primary stress.
Claims (10)
1. the testing apparatus of beryllium-bronze sheet spring normal temperature and high-temperature stress relaxation is characterized in that this equipment comprises: base (1), limiter (2), upper plate (3), pressure transducer (4), pressure head (5) and side plate (6);
Upper plate (3) be flat on base (1) directly over; Base (1) is vertical corresponding with the center of upper plate (3); The center of upper plate (3) has central through hole (32); Have left through hole (31) and right through hole (31) in the symmetrical position of central through hole (32), the position that the last vertical corresponding upper plate (3) of base (1) is gone up left through hole (31) and right through hole (31) has left counterbore (11) and right counterbore (11); Between the left counterbore (11) of base (1) and the left through hole of upper plate (3) (31), left limiter (2) is installed, between the right through hole (31) of the right counterbore (11) of base (1) and upper plate (3), right limiter (2) is installed; The two ends band external thread of left and right limiter (2), limiter (2) upper end is respectively through being bolted on left through hole of upper plate (3) (31) or the right through hole (31), and the lower end is separately fixed in the left counterbore (11) or right counterbore (11) of base (1); Pressure transducer (4) and pressure head (5) are positioned between base (1) and the upper plate (3); Pressure transducer (4) is connected with the data presentation instrument through sensor lead (8), and the upper end of pressure transducer (4) is fixed on the central through hole (32) of upper plate (3), and the lower end is fixed with pressure head (5); Pressure head (5) contacts with beryllium-bronze sheet spring to be measured; Side plate (6) is fixed on the front side of base (1), being centered close on the same vertical horizontal line of the downside of the center of the downside of side plate (6) and base (1); The center of the upside of side plate (6) has counterbore (62), is used for fixing an end of springs perforate to be measured; Described beryllium-bronze sheet spring to be measured is the equal stress sample, and an end has the hole.
2. the testing apparatus of a kind of beryllium-bronze sheet spring normal temperature according to claim 1 and high-temperature stress relaxation; It is characterized in that; Described pressure transducer (4) two ends band external thread; The central through hole (32) of upper plate (3) is passed in the upper end of pressure transducer (4), and is fixed on the upper plate (3) through nut, and the head of pressure transducer (4) lower end is provided with an end polished rod.
3. the testing apparatus of a kind of beryllium-bronze sheet spring normal temperature according to claim 2 and high-temperature stress relaxation; It is characterized in that; Described pressure head (5) is fixed on the pressure transducer (4) through internal thread; Corresponding to the polished rod that pressure transducer (4) one ends are provided with, also there is one section smooth section in the internal thread in the pressure head (5).
4. according to the testing apparatus of arbitrary described a kind of beryllium-bronze sheet spring normal temperature of claim 1-3 and high-temperature stress relaxation; It is characterized in that described equipment also comprises cushion block I, cushion block I integral body is a rectangle; The center has through hole, evenly has four holes in a week of through hole; The diameter of the central through hole of cushion block I is arranged on the joint of limiter (2) upper end and upper plate (3) greater than the diameter of limiter (2) upper end.
5. the testing apparatus of a kind of beryllium-bronze sheet spring normal temperature according to claim 1 and high-temperature stress relaxation; It is characterized in that the specification of described pressure transducer (4) is kz β k-1, output sensitivity is 2.248mV/V; Temperature range is 0 ℃～150 ℃, and range is 980N.
6. the testing apparatus of a kind of beryllium-bronze sheet spring normal temperature according to claim 1 and high-temperature stress relaxation is characterized in that, described beryllium-bronze sheet spring to be measured has the rectangular end of perforate, stressed horizontal segment and the trapezoidal sections that is connected rectangular end and horizontal segment.
7. the testing apparatus of a kind of beryllium-bronze sheet spring normal temperature according to claim 6 and high-temperature stress relaxation is characterized in that, described beryllium-bronze sheet spring to be measured; The wide 10mm of the rectangular end of perforate; Long 20mm, the width of horizontal segment are 2mm, and the angle on two isosceles limits of trapezoidal sections is 18.7 degree.
8. according to the testing apparatus of claim 6 or 7 described a kind of beryllium-bronze sheet spring normal temperature and high-temperature stress relaxation, it is characterized in that described pressure head (5) contact with the horizontal segment line of beryllium-bronze sheet spring to be measured, and the width of pressure head is greater than the width of horizontal segment.
9. application rights requires the beryllium-bronze sheet spring normal temperature of 1 described testing apparatus and the method for testing of high-temperature stress relaxation, it is characterized in that, comprises the steps:
Step 1 prepares beryllium-bronze sheet spring sample to be measured, comprises the steps:
Step 1.1: blanking, stress relaxation test material are beryllium-bronze;
Step 1.2: the material warp is cut into the equal stress sample; Described equal stress sample has the rectangular end of perforate, stressed horizontal segment, and the trapezoidal sections that connects rectangular end and horizontal segment;
Step 1.3:, reach the mechanical state of regulation with the Ageing Treatment that beryllium-bronze sheet spring sample to be measured is stipulated;
Step 2, the installation of testing apparatus and test are prepared;
Step 2.1: will set the crooked primary stress of reed and bring the initial deflection computing formula into, and confirm the vertical drop of limiter (2) and side plate (6);
Step 2.2: installation testing equipment; Described testing apparatus comprises: base (1), limiter (2), upper plate (3), pressure transducer (4), pressure head (5) and side plate (6); In when assembling, at first, side plate (6) is fixed on the front side of base (1), said side plate (6) and base (1), being centered close on the same vertical horizontal line of the downside of the two; Secondly, with an end of beryllium-bronze sheet spring sample to be measured perforate through in the center counterbore (62) that is bolted to side plate (6) upside; Then, pressure head (5) is fixed on the lower end of pressure transducer (4), the upper end of pressure transducer (4) is fixed on the central through hole (32) of upper plate (3), pressure transducer (4) is positioned at the downside of upper plate (3); At last; Assembling limiter (2); Left counterbore (11) that base (1) has and right counterbore (11), the left through hole (31) and the right through hole (31) of the vertical corresponding upper plate of difference (3), the left through hole (31) of described upper plate (3) and right through hole (31) are with respect to central through hole (32) left-right symmetric of upper plate; And base (1) is vertical corresponding with the center of upper plate (3); Assembling left limiter (2) between the left counterbore (11) of base (1) and the left through hole of upper plate (3) (31) assembles right limiter (2), the two ends band external thread of said limiter (2) between the right through hole (31) of the right counterbore (11) of base (1) and upper plate (3); The lower end is fixed in the left counterbore (11) or right counterbore (11) of base (1), and the upper end is through being bolted on left through hole of upper plate (3) (31) or the right through hole (31);
Step 2.3: the sensor lead (8) that will connect pressure transducer (4) links to each other with external data presentation instrument; And the power lead and the power supply of data presentation instrument joined, be under zero test mode at described measuring equipment the data Displaying Meter is returned to zero and range calibration;
Step 2.4: tighten the nut that upper plate (3) is gone up and arranged on left and right sides stationary restraint (2), guarantee as far as possible in the rundown process that beryllium-bronze sheet spring sample to be measured both sides are stressed evenly, after the data stabilization of pending data Displaying Meter, read primary stress;
Step 3; Carry out the spring stress relaxation test and gather the stress value of different time, specifically: the proving installation that will have beryllium-bronze sheet spring sample to be measured is placed in the high-temperature test chamber energized; Regulate the temperature of chamber, the bending stress value of sheet sample under the record different time;
Step 4 reaches the regulation test period, reads the instrument displayed value of termination test during the time; From chamber, taking out testing apparatus cools off; With the testing apparatus unloading, take out sample after the cooling, under free state, parked one hour; With the height of the recovery after the flexural deformation of strain-ga(u)ge measurement beryllium-bronze sheet to be measured spring sample, and then the stress relaxation damaed cordition of definite beryllium-bronze sheet spring sample to be measured.
10. the method for testing of beryllium-bronze sheet spring normal temperature according to claim 9 and high-temperature stress relaxation; It is characterized in that; Assembling limiter (2) described in the step 2.2, the vertical drop that need obtain according to step 2.1, the downside of adjustment upper plate (3) is apart from the vertical range of the upper side of side plate (6); When the insufficient height of limiter (2), through the cushion block I that same thickness is set between two limiters (2) and upper plate (3) reach the height that will set; Described cushion block I has thickness and the center has through hole, and the diameter of through hole is greater than limiter (2) upper end diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101235359A CN102650583A (en) | 2012-04-24 | 2012-04-24 | Beryllium bronze leaf spring normal-temperature and high-temperature stress relaxation testing device and testing method thereof |
Applications Claiming Priority (1)
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| CN2012101235359A CN102650583A (en) | 2012-04-24 | 2012-04-24 | Beryllium bronze leaf spring normal-temperature and high-temperature stress relaxation testing device and testing method thereof |
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| CN104089826A (en) * | 2014-07-29 | 2014-10-08 | 中铁第一勘察设计院集团有限公司 | Testing device and method for compression deformation modulus and strength of soil body in deep hole |
| CN107063535A (en) * | 2016-12-12 | 2017-08-18 | 贵州航天林泉电机有限公司 | A kind of leaf spring pressure-detecting device and its detection method |
| CN110174233A (en) * | 2019-05-09 | 2019-08-27 | 太原理工大学 | Experimental rig of the component under long duration load-corrosion-lateral impact load coupling |
| CN114252042A (en) * | 2020-09-25 | 2022-03-29 | 上海微电子装备（集团）股份有限公司 | Mask table vertical measurement tool and mask table vertical measurement method |
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Cited By (7)
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|---|---|---|---|---|
| CN104089826A (en) * | 2014-07-29 | 2014-10-08 | 中铁第一勘察设计院集团有限公司 | Testing device and method for compression deformation modulus and strength of soil body in deep hole |
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| CN107063535B (en) * | 2016-12-12 | 2023-01-20 | 贵州航天林泉电机有限公司 | Leaf spring pressure detection device and detection method thereof |
| CN110174233A (en) * | 2019-05-09 | 2019-08-27 | 太原理工大学 | Experimental rig of the component under long duration load-corrosion-lateral impact load coupling |
| CN110174233B (en) * | 2019-05-09 | 2020-10-13 | 太原理工大学 | Testing device for component under coupling action of long-term load-corrosion-lateral impact load |
| CN114252042A (en) * | 2020-09-25 | 2022-03-29 | 上海微电子装备（集团）股份有限公司 | Mask table vertical measurement tool and mask table vertical measurement method |
| CN114252042B (en) * | 2020-09-25 | 2023-12-22 | 上海微电子装备（集团）股份有限公司 | Mask table vertical measurement tool and mask table vertical measurement method |
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