WO2019105128A1

WO2019105128A1 - Rivet head fixture and riveting strength detection method for riveting type contact element thereof

Info

Publication number: WO2019105128A1
Application number: PCT/CN2018/109147
Authority: WO
Inventors: 何斌; 胡均高; 申志刚; 张阔; 王东; 叶如意; 王爱平; 王珩; 柏小平; 翁桅
Original assignee: 福达合金材料股份有限公司
Priority date: 2017-11-30
Filing date: 2018-09-30
Publication date: 2019-06-06
Also published as: CN108225898B; CN108225898A

Abstract

A rivet head (121) fixture (2) and a riveting strength detection method for a riveting type contact element thereof. The detection solution comprises: placing a rivet head (121) of a riveting type contact element to be tested between arch-shaped rivet head (121) fixing grooves (21) of left and right clamps (2a, 2b) of the rivet head (121) fixture (2) and tightly clamping the rivet head (121); and using a thrust meter (34) to apply a thrust force which is perpendicular to a length direction of a contact substrate (11) to the contact substrate (11) of the riveting type contact element to be tested, and stopping applying the thrust force until the rivet head (121) of the contact element to be tested and the contact substrate (11) rotate relatively, recording a thrust force value F1 in the thrust meter (34), measuring a distance L between a center point of the rivet head (121) and a thrust force applying point of the thrust meter (34) at the same time, and calculating a torque M of the riveting type contact element to be tested according to a formula M=F1*L. By using the method, specific data of riveting strength of a riveting type contact element can be detected, and the method is convenient to use, safe and reliable, and accurate in data, and can perform quantitative evaluation on the riveting strength of a rivet type electric contact.

Description

Rivet nail head fixing fixture and riveting contact element riveting strength detecting method thereof

Technical field

The invention belongs to the field of material property testing, and particularly relates to a testing technology for riveting strength, in particular to a rivet nail fixing fixture and a riveting strength detecting method for the riveted contact element.

Background technique

As the requirements for the use of electrical appliances in various industries continue to increase, the testing specifications for the performance of various components in electrical appliances are constantly improving. Riveted contact elements are used in various relays, contactors, small switches, thermostats, etc. in low-voltage electrical appliances. The structure of the riveted contact element generally comprises a contact base and a rivet riveted to the contact base. The rivet comprises a rivet head and a rivet top, the structure of which is shown in FIG.

Most electrical appliance manufacturers only need to test the size and riveting gap of the riveted contact components. The riveting strength is not clearly defined. Only a few manufacturers test the riveting strength. The torque detecting method is as follows: the rivet head of the riveted contact element is opened by a saw blade in a "one" groove, and then the torque wrench is inserted into the "one" type open groove to rotate, and the torque value is measured. Because the material of the electrical contact is mostly copper-silver alloy, the strength is low, it is easy to slip during the test, and when the saw blade is used to open the "one" groove, the width and depth cannot be accurately positioned, so the measured value fluctuates greatly. It has always been a technical problem that cannot be solved in the industry.

Summary of the invention

SUMMARY OF THE INVENTION A first object of the present invention is to provide a rivet head fixing jig for riveting strength detection of a riveted contact element that is easy to operate, safe and reliable.

Another object of the present invention is to provide a method for detecting the riveting strength of a riveted contact member based on the above-described rivet head fixing jig.

In order to achieve the first object of the present invention, the technical solution is to include a left clamp and a right clamp having left and right opposite clamping rivet heads, and the clamping faces of the left and right clamps are respectively provided with rivet heads The arc-shaped fixing groove has an angle of 110-130° and a depth of 1.5-3 mm, and the inner wall of the arc-shaped fixing groove of the rivet head is evenly spaced with a plurality of convex teeth, and the protrusion is convex The height is 0.2-1mm.

Further, the angle of the arcuate fixing groove of the rivet head is 120°.

Further, it is provided that there are three or more of the convex teeth, the convex teeth are in the shape of an isosceles right triangle, and the convex height of the convex teeth is 0.3 mm.

In order to achieve the second object of the present invention, the technical solution is a riveted contact element riveting strength detecting method, which comprises the following steps:

(1) placing the rivet head of the rivet-type contact element to be tested between the curved fixing grooves of the rivet heads of the left and right clamps of the rivet head fixing fixture, and clamping the rivet head;

(2) using the thrust gauge to apply a thrust perpendicular to the longitudinal direction of the contact base of the contact base of the riveted contact element, until the rivet head of the contact element to be tested and the contact base rotate relative to each other, Record the thrust value F1 in the thrust meter, and measure the distance L between the center point of the rivet head and the thrust application point of the thrust meter. Calculate the torque M of the riveted contact element to be tested according to the formula M=F1*L. ;

(3) According to the radius R of the rivet nail of the riveted contact element to be tested, the rivet nail side area S, the frictional force per unit area F=M/(R*S), and the friction per unit area Force to indicate the riveting strength.

The invention has the beneficial effects that the above-mentioned scheme can detect the specific data of the riveting strength of the riveted contact element, and has the advantages of convenient operation, safety and reliability, accurate data, etc., and can quantitatively evaluate the riveting strength of the rivet type electrical contact.

In addition, by the rivet head fixing fixture of the present invention, the rivet head of the rivet-type contact element is clamped and fixed in the arc-shaped fixing groove of the rivet head by clamping the left clamp and the right clamp, thereby not only The clamping and fixing of the rivet head is firm, and there is no need to open a "one" groove as in the conventional detecting method, and the mechanical structure of the rivet head is not damaged, and the clamping structure is set, and the rivet head is not tested. Will slip.

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DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and it is still within the scope of the present invention for those skilled in the art to obtain other drawings based on these drawings without any inventive labor.

Figure 1 is a schematic view of a riveted contact element;

2 is a schematic view of the principle of the invention of the present invention;

Figure 3 is a schematic view showing the fixing groove of the rivet nail head fixture;

Figure 4 is a schematic view of the rivet nail head fixed;

Fig. 5 is a view showing the assembly of the detecting device of the embodiment of the present invention.

Detailed ways

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings.

The directions and positional terms mentioned in the present invention, such as "upper", "lower", "before", "after", "left", "right", "inside", "outside", "top", "bottom" "", "side", etc., only refer to the direction or position of the drawing. Accordingly, the scope of the invention is to be construed as illustrative and not restrictive.

As shown in FIG. 1 to FIG. 4, in the embodiment of the present invention, the implementation steps are as follows:

(1) Preparing the riveted contact element to be tested, as shown in FIG. 1 , the riveted contact element includes a contact base 11 and a rivet 12 riveted to the contact base, and the rivet 12 includes a rivet The head 121 and the rivet top 122; the rivet specifications are: R3 × 0.8 (0.2) + 1.5 × 1.4mm, the material is: AgCdO12 / Cu, the thickness of the copper piece is: 0.4mm, the material is QSn6.5-0.1;

(2) The riveted contact element rivet head 121 is placed in the rivet nail head arc fixing groove 21 of the rivet head fixing jig 2, and the rivet head fixing jig 2 of the embodiment includes the left and right relative clamping rivets The left clamp 2a and the right clamp 2b of the nail head, the clamping faces of the left clamp 2a and the right clamp 2b are respectively provided with a rivet head arc-shaped fixing groove 21, and the rivet head has a curved fixing groove 21 The angle is preferably 120°, the depth is 1.5-3 mm, preferably 1.5 mm, and the uniform spacing on the inner wall of the arcuate fixing groove of the rivet head is preferably provided with three convex teeth 22, the convex teeth being in the shape of an isosceles right triangle, The height of the projections is preferably 0.3 mm. The left jig 2a and the right jig 2b according to the embodiment are preferably made of a material having a relatively large hardness, such as hardened steel, die steel, etc. Further, the left jig 2a and the right jig 2b may be disposed in a clamp or a cylinder, A device such as a motor is used to provide clamping power.

After the riveted contact element 1 is clamped, as shown in FIG. 2, the clamping force of the rivet head fixing jig 2 to the rivet head is shown by reference numeral F2, and the length direction of the rivet contact element (ie, touch The length direction of the head base 11 is parallel to the longitudinal direction of the fixing jig 2, and the rivet head 121 of the contact element is locked;

(3) Press the thrust meter (preferably a digital display thrust meter) to press the button until the rivet head 121 of the test contact element rotates and then stop, and record the thrust count value F1.

complete test.

A dial gauge is set on the rivet head fixing jig 2, the degree of clamping of the rivet head 121 is measured by a dial gauge, and the distance between the center point of the nail head and the thrust gauge head is measured by a scale on the mounting base. L, multiplying the detected thrust value F1 by the distance measured by the scale to obtain the torque M of the riveted contact element.

The test 10 pieces of data were: 78 N·mm; 79 N·mm; 80 N·mm; 81 N·mm; 78 N·mm; 79 N·mm; 83 N·mm; 81 N·mm; 81 N·mm; 79 N·mm.

Rivet stud pin radius is 0.75mm, the staple legs lateral area of 2.47mm ^2, the frictional force per unit area F = M / (RxS) ^{stars: 42.10N / mm 2, 42.65N /} mm 2, 43.18N / mm ² , 43.72 N/mm ² , 42.10 N/mm ² , 42.65 N/mm ² , 44.80 N/mm ² , 43.72 N/mm ² , 43.72 N/mm ² , 42.65 N/mm ² .

Example 2

The implementation steps are as follows:

(1) Prepare the riveted contact elements to be tested. The rivet specifications are: F3×0.8(0.2)+1.5×1.4mm, the material is: AgSnO ₂ /Cu, the thickness of the copper parts is 0.5mm, the material is H62;

(2) Inserting the rivet-type contact element rivet head into the rivet nail head arc-shaped fixing groove 21 of the rivet nail head fixing jig, the length direction of the contact element is parallel to the longitudinal direction of the fixing jig, and the contact element is locked. Rivet head

(3) Press the digital display thrust gauge push button until the test contact component rivet head rotates and stop, and record the thrust count value F1.

complete test.

The degree of clamping of the nail head is measured by a dial gauge on the rivet fixing fixture, the distance between the center point of the nail head and the thrust gauge head is measured, and the detected thrust value is multiplied by the distance measured by the scale to obtain a riveted type. Torque of the contact element.

The test 10 pieces of data were: 200 N·mm; 208 N·mm; 210 N·mm; 205 N·mm; 203 N·mm; 201 N·mm; 201 N·mm; 206 N·mm; 204 N·mm; 209 N·mm.

Rivet stud pin radius is 0.75mm, the staple legs lateral area of 2.47mm ^2, the frictional force per unit area F = M / (RxS) ^{stars: 107.96N / mm 2, 112.28N /} mm 2, 113.36N / mm ² , 110.66 N/mm ² , 119.58 N/mm ² , 108.5 N/mm ² , 108.5 N/mm ² , 111.2 N/mm ² , 110.12 N/mm ² , 112.82 N/mm ² .

Detection device assembly embodiment

As shown in FIG. 5, the detecting device includes a base 31. The base 31 is provided with a fixed clamp driving mechanism 32. The fixed clamp driving mechanism 32 uses a screw rod 321 and a screw seat 322. The threaded coupling enables the screw 321 to slide, and the lead screw 321 is cooperatively engaged with the left clamp 2a, and drives the left clamp 2a and the right clamp 2b to clamp each other or away from each other. Further, a scale is provided on the side of the base 31 corresponding to the fixed jig drive mechanism 32. Further, a longitudinal rail frame 33 is provided on the base 31 with respect to the side of the fixed jig drive mechanism 32. The longitudinal rail frame 33 is provided with a thrust gauge 34, and a dial gauge 35 is further provided.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and thus equivalent changes made in the claims of the present invention are still within the scope of the present invention.

Claims

A rivet nail head fixing jig for riveting contact element detecting riveting strength, characterized in that: a left jig and a right jig including left and right opposite clamping rivet heads, and clamping faces of said left jig and right jig The upper surface of the rivet nail head has a curved fixing groove, and the angle of the arc-shaped fixing groove of the rivet nail head is 110-130°, the depth is 1.5-3 mm, and the inner wall of the arc-shaped fixing groove of the rivet nail head is evenly spaced. The convex teeth have a convex height of 0.2-1 mm.
The rivet head fixing jig for detecting the riveting strength of the riveted contact element according to claim 1, wherein the rivet head has an arc-shaped fixing groove at an angle of 120°.
The rivet head fixing jig for detecting the riveting strength of the rivet-type contact element according to claim 1, wherein the convex teeth have three or more teeth, and the convex teeth have a shape of an isosceles right angle. The triangle has a convex height of 0.3 mm.
A method for detecting the riveting strength of a riveted contact element according to the fixing jig according to claim 1, comprising the steps of:

(1) placing the rivet head of the rivet-type contact element to be tested between the curved fixing grooves of the rivet heads of the left and right clamps of the rivet head fixing fixture, and clamping the rivet head;

(2) using the thrust gauge to apply a thrust perpendicular to the longitudinal direction of the contact base of the contact base of the riveted contact element, until the rivet head of the contact element to be tested and the contact base rotate relative to each other, Record the thrust value F1 in the thrust meter, and measure the distance L between the center point of the rivet head and the thrust application point of the thrust meter. Calculate the torque M of the riveted contact element to be tested according to the formula M=F1*L. ;

(3) According to the radius R of the rivet nail of the riveted contact element to be tested, the rivet nail side area S, the frictional force per unit area F=M/(R*S), and the friction per unit area Force to indicate the riveting strength.