CN2243076Y

CN2243076Y - Metal-material extension rate test instrument

Info

Publication number: CN2243076Y
Application number: CN 95226841
Authority: CN
Inventors: 崔小朝; 常琍琍; 苏玉堂; 冯宝莲
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-07
Filing date: 1995-12-07
Publication date: 1996-12-18
Anticipated expiration: 2005-12-07

Abstract

The utility model relates to a metal material extension rate testing instrument. The utility model is composed of a fixing bracket for a tested element, an electric indenter and a vernier caliper gauge; the tested element is arranged on a V-shaped sliding block of the fixing bracket and clamped tightly so as to prevent the tested element from left and right movement; the discharge tip of the electric indenter is arranged on the vernier caliper gauge along with a contactor of the electric indenter, and when the discharge tip is to contact the tested element, a low pressure high current formed by a loop makes the discharge tip discharges, generate sparks and leaves marking distance marks. The utility model combines the functions of engraving marking distance and measuring marking distance and has the advantages of simple structure, convenient operation, high work efficiency and small measuring error.

Description

Metal material extensibility tester

The utility model belongs to a kind of measurement mechanism, is specifically related to a kind of device of testing the metal material extensibility.

In the mechanical property test chamber, test metal material extensibility generally is the method that adopts " punching pin+hammer+vernier caliper " or " groove instrument+vernier caliper ", promptly on metal specimen, make the gauge length indentation with described instrument, break the length of front and back with the vernier caliper measurement test specimen, calculate its extensibility at last.The disadvantage of this method of testing has two, one, and test specimen does not have stationary installation, blaze apart from the time roll easily, the test specimen after breaking is difficult to closely accurately dock, and a people can't operate, work efficiency is lower; The 2nd, institute's gauge length indentation of doing is bigger, influence the accuracy of gauge length measurement, therefore, to survey the extensibility error bigger.Now also have the discrete trial chamber to adopt laser to make the gauge length indentation, though there is not the disadvantage of above-mentioned two aspects, the investment of this laser instrument is very big, concerning the conventional test chamber, can only be unattainable.

The purpose of this utility model task is at the problems referred to above, provide an a kind of people can independent operation, simple, mark apart from accurately, metal extensibility tester that error is little.

The measure of finishing above-mentioned task is: design one integrates the device of test specimen fixed mount, electric notcher and vernier caliper, be that the test specimen fixed mount fixedly constitutes a U type frame by a base plate and supported on both sides plate, in U type frame, if two guide rails that are installed with two grip slides and two V-type slide blocks, its V-type slide block is put between two grip slides; This vernier caliper is erected on the supported on both sides plate; This electricity notcher comprises contactor, contact chip, discharge tip and transformer, its contactor is installed on the vernier of vernier caliper, contact chip is contained on the contactor, and discharge tip is located under the contact chip, and places test specimen fixed mount top, when the vernier move left and right of vernier caliper, discharge tip can be in company with moving the gauge length point that points to test specimen, and transformer places in the U type frame, and its positive and negative electrode is connected with the positive and negative electrode of contactor, and positive pole also is connected with discharge tip, and negative pole has contact in test specimen.

Using method of the present utility model and principle of work are that test specimen places on the two V-type slide blocks of fixed mount before will breaking earlier, and is fixedly clamped with the grip slide of both sides, prevents its move left and right; Moving cursor makes discharge tip point to certain gauge length point, and from its value of slide calliper rule record, crawl electricity notcher K switch then, at this moment circuit loop just forms the high stream of low pressure, in the discharge tip discharge electric spark takes place, and the ionized air layer stays the gauge length indentation on metal specimen; Moving cursor is determined second gauge length point again, makes the second gauge length indentation with same maneuver; Take off the test specimen loading and finish drawing process, the test specimen of will having no progeny again butt joint places fixed mount again, clamps once more, measures its development length with vernier caliper, calculates its extensibility.

The utility model has the advantages that: the electric spark blaze is broken the effective length of front and back apart from measuring test specimen accurately; Small and exquisite fixed mount has overcome traditional blaze can not make the disadvantage of gauge length indentation apart from non-people institute, thereby has improved work efficiency, and the test specimen of having no progeny can closed butt joint, the minimizing measuring error; Integrate blaze apart from operating apart from being more convenient for mark.Use the utility model, can satisfy the regulation of metal tensile test method (GB228-87) fully: " the measurer minimum scale value of measuring disconnected preceding gauge length should be not more than 0.5mm ", " measurement have no progeny the measurer minimum scale value of gauge length should be not more than 0.1mm " and " extensibility δ＞10% o'clock; error is for being not more than 1%; δ＜10% o'clock, error is not more than 0.1% ".

Existing accompanying drawings the utility model structure:

Fig. 1 is this tester structural representation;

Fig. 2 is electric notcher electrical schematic diagram.

Among the figure, be provided with two guide rails 1 that are installed with two grip slides 2 and two V-type slide blocks 3 in the U type frame that is made of base plate 11 and supported on both sides plate 8, grip slide 2 is put V-type slide block 3 both sides; Vernier caliper 9 is erected on the supported on both sides plate 8; The contactor 6 of electricity notcher is fixed on the slide calliper rule vernier 12, contact chip 5 is contained on the contactor, discharge tip end 4 can replace with pin, be contained in contact chip 5 below, it can move any gauge length point that points to test specimen 7 with vernier, and when crawl electricity notcher K switch, emit electric spark, on test specimen, make the gauge length indentation, transformer 10 places in the U type frame, its positive and negative electrode is connected with the contactor positive and negative electrode with lead 13, and with other lead its positive pole is connected in discharge tip 4, and negative pole is established contact in test specimen.

Claims

A kind of metal material extensibility tester is made up of test specimen fixed mount, electric notcher and vernier caliper, this test specimen fixed mount that is characterised in that of the present utility model is fixedly to constitute a U type frame by a base plate and supported on both sides plate, establish two guide rails that are installed with two grip slides and two V-type slide blocks in U type frame, its V-type slide block is put between the grip slide; This vernier caliper is erected on the supported on both sides plate; This electricity notcher comprises contactor, contact chip, discharge tip and transformer, and contactor is installed on the vernier of vernier caliper, and contact chip is contained on the contactor, and discharge tip is located under the contact chip, and places test specimen fixed mount top; Transformer places in the U type frame, and its positive and negative electrode is connected with the positive and negative electrode of contactor, and positive pole also is connected with discharge tip, and negative pole has contact in test specimen.