CN118168913A - A high temperature shear test fixture, system and shear test method for ring spacer magnetic steel - Google Patents

Abstract

The present invention discloses a high-temperature shear test fixture, system and shear test method for ring spacer magnetic steel, belonging to the field of shear test technology, the test system includes a test fixture, a test hot table, a test head and a shear splitter installed on a mechanical arm and a control system, the test fixture is fixedly connected to the test hot table, and a temperature measuring thermocouple is arranged on the test fixture; the shear splitter is arranged vertically and can move relative to the test fixture in three dimensions with the mechanical arm above the test hot table; the control system includes an acquisition detection circuit and a hot table control circuit, the control system is electrically connected to the test head and receives the shear height, shear speed, implantation speed, and implantation range process parameters transmitted by the test head. The present invention can design corresponding ring spacer test fixtures according to different ring spacer models, can meet the fixed clamping of ring spacer substrates of various models and sizes, the clamping operation is convenient, the applied shear force value can be accurately measured, and the test efficiency and reliability are guaranteed.

Description

A high temperature shear test fixture, system and shear test method for ring spacer magnetic steel

Technical Field

The present invention relates to the technical field of shear testing, and in particular to a high-temperature shear testing fixture, system and shear testing method for magnetic steel of annular spacers.

Background technique

The ring spacer is a multi-port passive device widely used in microwave communications. The ring spacer magnet is fixed to the ring spacer substrate with adhesive (as shown in Figure 7), and its mass is relatively large. In the process of engineering application, the bonding area is subjected to various thermal loads and there is a risk of aging. Therefore, it is of great significance to test its bonding strength and evaluate its reliability.

The shear strength of the ring spacer is determined by measuring the magnitude of the shear force to determine the integrity of the materials and processes used for the chips or passive devices on the ring spacer substrate. During the test, the ring spacer substrate needs to be fixed to ensure that the shear thrust is evenly applied. However, the material of the ring spacer substrate is thin and brittle, and the conventional direct clamping method has the risk of cracking; at the same time, the stress generated by clamping the ring spacer substrate will also increase the risk of cracking the ring spacer substrate during the shear test, and it is difficult to test in batches. In addition, the bonding area between the ring spacer magnet and the ring spacer substrate is sensitive to temperature, and sintering samples will introduce additional thermal stress, causing premature aging, affecting the accuracy of the shear results.

Summary of the invention

Technical problem to be solved: In view of the technical problems existing in the high-temperature shear test process of ring spacer magnetic steel in the prior art, the present invention provides a high-temperature shear test fixture, system and shear test method for ring spacer magnetic steel. The test system can design corresponding ring spacer test fixtures according to different ring spacer models, and can meet the fixed clamping of ring spacer substrates of various models and sizes. The clamping operation is convenient, and the applied shear force value can be accurately measured, thereby ensuring test efficiency and reliability.

Technical solution: The present invention discloses a high-temperature shear test fixture for a ring spacer magnetic steel. The test fixture comprises a fixture plate body made of a high-temperature resistant and high-thermal conductivity material. The fixture plate body is provided with a plurality of first U-shaped slots and second U-shaped slots that correspond to each other and are arranged in layers at equal intervals along one side of its length direction. The width of the first U-shaped slot is adapted to the diameter of the ring spacer magnetic steel, and the width of the second U-shaped slot is adapted to the width of the ring spacer substrate. The width of the second U-shaped slot is greater than the width of the first U-shaped slot, and the second U-shaped slot forms concave slots on both sides of the first U-shaped slot.

The depth of the first U-shaped groove is greater than that of the second U-shaped groove. The bottom surface of the first U-shaped groove forms a baffle at the bottom of the second U-shaped groove, and the bottom of the second U-shaped groove extends to both sides at the outer end of the baffle to form an arc-shaped groove, and the opening direction of the arc-shaped groove is perpendicular to the direction of the concave slot.

Preferably, the bottom of the first U-shaped groove is located on the upper side of the baffle to form a constriction groove bottom structure.

Preferably, the four corners of the clamp plate body are provided with fixing countersunk holes for fixing screws to pass through.

Preferably, the number, spacing and depth of the first U-shaped grooves and the second U-shaped grooves are set according to the model of the ring spacer.

Preferably, the thickness of the baffle is not greater than the thickness of the ring spacer substrate, and the width of the baffle is greater than the diameter of the ring spacer magnetic steel.

Preferably, the width between the two concave grooves is greater than the width of the ring spacer substrate, and the thickness thereof is greater than the thickness of the ring spacer substrate.

The present invention also discloses a high temperature shear test system for a ring spacer magnetic steel, comprising a test fixture; the test system further comprises:

A test hot table, wherein the test fixture is fixedly connected to the test hot table, and a temperature measuring thermocouple is arranged on the test fixture;

A test head and a shearing knife mounted on the mechanical arm, wherein the shearing knife is arranged vertically and can move relative to the test fixture in three dimensions above the test hot table with the mechanical arm;

A control system, the control system includes an acquisition detection circuit connected to the temperature measuring couple and a hot stage control circuit electrically connected to the test hot stage, the control system is electrically connected to the test head and receives the shear height, shear speed, implantation speed, and implantation range process parameters transmitted by the test head.

The present invention also discloses a high temperature shear test method for a ring spacer magnetic steel, using a test system, comprising the following steps:

Step 1: Fix the test fixture on the test hot table by fastening screws through the fixed countersunk holes, keeping the top surface of the fixture plate facing upwards and the bottom surface facing downwards in close contact with the test hot table;

Step 2: Mount the thermocouple on the fixture plate and connect it to the acquisition detection circuit. The thermocouple monitors the required shearing temperature in real time and feeds back to the hot stage control circuit. The hot stage control circuit controls the test hot stage to heat the test fixture. The test fixture heats the ring spacer by heat transfer.

Step 3: When the temperature measuring thermocouple detection test fixture is stabilized to the required temperature value, the ring spacer sample is slidably mounted along the second U-shaped slot through its ring spacer base plate into the concave slot to the baffle, completing the fixed connection between the ring spacer sample and the test fixture;

Step 4: Install the shearing knife and the test head on the robot arm accordingly, and set the initial position of the shearing knife, shearing height, shearing speed, implantation speed, downward pressure value and implantation range process parameters;

Step 5: After the ring spacer reaches the required temperature for the test, according to the shear process parameter settings in step 4, the control system controls the mechanical arm to drive the shear cutter and the test head to apply shear force to the magnetic steel of the ring spacer to perform a high temperature shear test.

Compared with the prior art, the present invention has at least the following beneficial effects:

1. The present invention can design corresponding ring spacer test fixtures according to different ring spacer models, which can meet the needs of fixing and clamping ring spacer substrates of various models and sizes; the test fixture adopts a concave card slot design, and the ring spacer substrate and the test fixture adopt a sliding installation method, which is convenient for clamping operation and can effectively prevent the ring spacer from turning over and moving during the test process, while avoiding the risk of cracking of the ring spacer substrate when the conventional clamping method is used;

2. The number, spacing and depth of the first U-shaped slot and the second U-shaped slot of the test fixture can be dynamically adjusted according to the size structure of the ring spacer, so that batch testing of the ring spacer can be realized;

3. The baffle structure designed in the test fixture can prevent the shear cutter and the ring spacer magnet from contacting the fixture plate during the high-temperature shear test, thereby generating an unreal force curve, making the test results more accurate;

4. The test fixture adopts an arc-shaped notch structure at the bottom of the second U-shaped slot, which can prevent the corners of the ring spacer substrate from breaking due to stress concentration during installation and testing;

5. When the test system performs shear test on the ring spacer, the ring spacer sample can be tested without sintering and sample preparation, which effectively avoids the introduction of additional thermal stress caused by sintering temperature rise and ensures the accuracy of the test results; the test system can accurately measure the applied shear force value to ensure test efficiency and reliability;

6. The high-temperature shear test method can detect the test temperature of the test fixture in real time, realize the closed-loop control of the test hot stage heating, reduce the temperature loss in the test hot stage transmission process, meet the temperature requirements of the ring spacer heating, and avoid insufficient testing; the ring spacer and the test fixture adopt the sliding installation method to realize the early heating of the test fixture, and avoid the aging and failure of the adhesive part of the ring spacer during the heating and constant temperature process;

7. This test method makes up for the shortcomings of the current high-temperature shear test of the magnetic steel of the ring spacer, improves the ability to evaluate its bonding reliability, and can meet the applicable working conditions of different adhesives for testing. The high-temperature shear test results are of guiding significance for the selection of adhesives.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a three-dimensional structure of a test fixture of the present invention from a first viewing angle;

FIG2 is a top view of the test fixture structure in FIG1 ;

FIG3 is a side view of the test fixture structure in FIG1 ;

FIG4 is a front view of the test fixture structure in FIG1 ;

FIG5 is a schematic diagram of the three-dimensional structure of the test fixture of the present invention from a second viewing angle;

FIG6 is a top view of the test fixture structure in FIG5 ;

FIG7 is a schematic diagram of the structure of the ring spacer of the present invention;

FIG8 is a schematic diagram of the connection structure between the ring spacer and the test fixture of the present invention;

FIG. 9 is a schematic diagram of the control flow of the test system of the present invention.

Figure numerals: 100, test system; 1, test fixture; 11, fixture plate; 12, fixed countersunk hole; 13, first U-shaped slot; 14, beam slot bottom; 15, baffle; 16, second U-shaped slot; 17, arc-shaped slot; 18, concave slot; 2, ring spacer; 21, ring spacer magnet; 22, adhesive; 23, ring spacer substrate; 3, shearing knife; 4, test hot stage; 5, temperature measuring thermocouple; 6, control system; 7, data acquisition and detection circuit; 8, hot stage control circuit.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with Figures 1 to 9. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

As shown in FIG. 7 , the ring spacer 2 used in the present invention includes a ring spacer magnetic steel 21 and a ring spacer base plate 23 . The ring spacer magnetic steel 21 is fixed to the ring spacer base plate 23 using an adhesive 22 .

Embodiment 1: As shown in Figures 1 to 6, the present invention discloses a high-temperature shear test fixture for ring spacer magnetic steel. The test fixture 1 includes a fixture plate body 11 made of a high-temperature resistant and high-thermal conductivity material. The fixture plate body 11 can be made of aluminum alloy, copper, steel and other materials. The fixture plate bodies 11 made of different materials have different top and bottom surface features.

The fixture plate body 11 is provided with a plurality of first U-shaped slots 13 and second U-shaped slots 16 which correspond to each other and are arranged in layers at equal intervals along one side of its length direction. The central axes of the first U-shaped slots 13 and the second U-shaped slots 16 are located in the same plane along the thickness direction of the fixture plate body 11, that is, the first U-shaped slots 13 and the second U-shaped slots 16 are superimposed together along the thickness direction of the fixture plate body 11 to form a through slot structure which passes through from top to bottom. The width of the first U-shaped slot 13 is adapted to the diameter of the magnetic steel of the ring spacer, the width of the second U-shaped slot 16 is adapted to the width of the base plate of the ring spacer, and the second U-shaped slots 1 6 is greater than the width of the first U-shaped slot 13, so that the second U-shaped slot 16 forms concave slots 18 on both sides of the bottom surface of the first U-shaped slot 13, and the width between the two concave slots 18 is greater than the width of the ring spacer substrate 23, and its thickness is greater than the thickness of the ring spacer substrate 23, which meets the requirements of the concave slot 18 for accommodating and clamping the ring spacer substrate 23. The concave slot 18 design is adopted to realize the sliding installation of the ring spacer substrate, which is convenient and fast, and can effectively prevent the ring spacer from turning over and moving during the shear test, and at the same time avoid the risk of rupture of the ring spacer substrate in the conventional clamping method. The depth of the first U-shaped slot 13 is greater than the depth of the second U-shaped slot 16. Here, the depth is the length of the first U-shaped slot 13 or the second U-shaped slot 16 extending along the width direction of the fixture plate body 11, and the thickness corresponding to the first U-shaped slot 13 or the second U-shaped slot 16 is the depth in the thickness direction of the fixture plate body 11. The bottom surface of the first U-shaped groove 13 forms a baffle 15 at the bottom of the second U-shaped groove 16. The thickness of the baffle 15 is not greater than the thickness of the ring spacer base plate 23, and its width is greater than the diameter of the ring spacer magnetic steel 21. The baffle 15 designed in the test fixture 1 of the present invention can prevent the shear knife 3 and the ring spacer magnetic steel 21 from generating an unreal force value curve when contacting the fixture plate body 11 during the shear test, so that the test result is more accurate.

The bottom of the second U-shaped groove 16 extends to both sides at the outer end of the baffle 15 to form an arc-shaped groove 17. The opening direction of the arc-shaped groove 17 is perpendicular to the direction of the concave slot 18. The design of the arc-shaped groove 17 can prevent the stress concentration of the ring spacer base plate 23 and the breakage. The top and bottom surfaces of the first U-shaped groove 13 and the second U-shaped groove 16 are parallel surfaces corresponding to the top and bottom surfaces of the fixture plate 11. For example, the bottom surface of the first U-shaped groove 13 refers to a virtual surface where the first U-shaped groove 13 contacts the second U-shaped groove 16 and is located in the fixture plate 11 and parallel to the top surface of the fixture plate 11. The top surface of the first U-shaped groove 13 is also the top surface of the fixture plate 11, the top surface of the second U-shaped groove 16 is the bottom surface of the first U-shaped groove 13, and the bottom surface of the second U-shaped groove 16 is the bottom surface of the fixture plate 11. The number, spacing and depth of the first U-shaped slot 13 and the second U-shaped slot 16 of the test fixture 1 of the present invention are set according to the model of the ring spacer 2, and the sizes of different U-shaped slots of different test fixtures 1 can also be customized according to the needs to meet the high temperature shear test requirements of ring spacers of different sizes at the same time, so as to realize batch testing. As shown in Figure 1, the number of U-shaped slots of the test fixture 1 is 3, and the sizes of the three U-shaped slots are the same. The said U-shaped slots refer to the first U-shaped slot and the second U-shaped slot arranged in corresponding layers up and down.

In a preferred embodiment, the bottom of the first U-shaped slot 13 is located on the upper side of the baffle 15 to form a constriction slot bottom 14 structure.

In a preferred embodiment, the four corners of the fixture plate 11 are provided with fixing countersunk holes 12 for fixing screws to pass through, and the fixing screws pass through the fixing countersunk holes 12 to be fixedly connected to the test hot table.

Embodiment 2: As shown in Figures 8 and 9, the present invention also discloses a high-temperature shear test system for ring spacer magnetic steel. The test system 100 includes a test fixture 1, a test hot table 4, a test head (not shown in the figure) installed on a mechanical arm (not shown in the figure) and a shear cutter 3 and a control system 6. The test fixture 1 is fixedly connected to the test hot table 4. A temperature measuring couple 5 is arranged on the test fixture 1, and the temperature measuring couple 5 can detect the temperature of the test fixture 1 in real time. The mechanical arm can be integrated with pulleys, hydraulic cylinders, etc. in the prior art to realize its function. The shearing blade 3 is used to apply shear force to the ring spacer magnetic steel 21. The test head can be used to detect the initial position, shear height, shear speed, implantation speed, downward pressure value and implantation range and other process parameters of the shearing blade 3. The test head can be integrated with components such as displacement sensors, force sensors, laser rangefinders, etc. in the prior art to realize its function; the shearing blade 3 is vertically arranged and can move relative to the test fixture 1 above the test hot table 4 with the mechanical arm. The mechanical arm can realize its function with the prior art. The shearing blade 3 can move freely in the X, Y, and Z directions relative to the hot table in the space above the test hot table 4 with the mechanical arm to meet the demand for applying shear force to the ring spacer magnetic steel 21. The control system 6 includes a collection detection circuit 7 connected to the temperature measuring thermocouple 5 and a hot table control circuit 8 electrically connected to the test hot table 4. The control system 6 is electrically connected to the test head and receives the shear height, shear speed, implantation speed, and implantation range process parameters transmitted by the test head. When the test system of the present invention performs a high-temperature shear test, the ring spacer sample can be tested without sintering, which effectively avoids the additional thermal stress introduced by heating the ring spacer by sintering, and ensures the accuracy of the test result.

Embodiment 3: The present invention also discloses a high temperature shear test method for a ring spacer magnetic steel, using a test system 100, comprising the following steps:

Step 1: Fix the test fixture 1 on the test hot table 4 by fastening screws through the fixing countersunk holes 12, keeping the top surface of the fixture plate 11 facing upwards and the bottom surface facing downwards in close contact with the test hot table 4;

Step 2: Mount the thermocouple 5 on the fixture plate 11 and connect it to the acquisition detection circuit 7. The thermocouple 5 monitors the shearing temperature in real time and feeds back to the hot stage control circuit 8. The hot stage control circuit 8 controls the test hot stage 4 to heat the test fixture 1. The test fixture 1 heats the ring spacer 2 by heat transfer.

Step 3: When the temperature measuring couple 5 detects that the test fixture 1 is stable to the required temperature value, the ring spacer 2 sample is slidably inserted into the concave slot 18 along the second U-shaped slot 16 through its ring spacer base plate 23 to the baffle 15, thereby completing the fixed connection between the ring spacer 2 sample and the test fixture 1;

Step 4: Install the shearing knife 3 and the test head on the robot arm accordingly, and set the initial position, shearing height, shearing speed, implantation speed, downward pressure value and implantation range process parameters of the shearing knife 3;

Step 5: After the ring spacer 2 reaches the required temperature for the test, according to the shear process parameter settings in step 4, the control system 6 controls the mechanical arm to drive the shear cutter 3 and the test head to apply shear force to the ring spacer magnetic steel 21 to perform a high temperature shear test.

The high-temperature shear test method for the magnetic steel of the ring spacer of the present invention can detect the test temperature of the test fixture 1 in real time, realize the closed-loop control of the heating of the test hot stage 4, reduce the temperature loss in the transmission process of the test hot stage 4, meet the temperature requirements of the heating of the ring spacer 2, and avoid insufficient testing; the ring spacer and the test fixture adopt a sliding installation method to realize the early heating of the test fixture, and avoid the aging and failure of the adhesive 22 of the ring spacer during the heating and constant temperature process. This test method makes up for the shortcomings of the current high-temperature shear test of the magnetic steel of the ring spacer, and improves the ability to evaluate its bonding reliability.

The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims (8)

1. The high-temperature shearing test fixture for the magnetic steel of the annular spacer is characterized in that the test fixture (1) comprises a fixture plate body (11) made of high-temperature-resistant and high-heat-conductivity materials, a plurality of first U-shaped grooves (13) and second U-shaped grooves (16) which are vertically corresponding and are arranged in a layered manner are formed in one side of the fixture plate body (11) at equal intervals along the length direction, the width of the first U-shaped grooves (13) is matched with the diameter of the magnetic steel of the annular spacer, and the width of the second U-shaped grooves (16) is matched with the width of a base plate of the annular spacer; the width of the second U-shaped groove (16) is larger than that of the first U-shaped groove (13), and concave clamping grooves (18) are respectively formed on two sides of the first U-shaped groove (13) by the second U-shaped groove (16);

The first U-shaped groove (13) depth is greater than the second U-shaped groove (16), the bottom surface of the first U-shaped groove (13) forms a baffle (15) at the groove bottom of the second U-shaped groove (16), the groove bottom of the second U-shaped groove (16) extends to two sides at the outer end of the baffle (15) respectively to form arc-shaped grooves (17), and the opening direction of the arc-shaped grooves (17) is perpendicular to the direction of the concave clamping groove (18).

2. The high-temperature shearing testing fixture for the ring separator magnetic steel according to claim 1, wherein the groove bottom of the first U-shaped groove (13) is positioned on the upper side of the baffle plate (15) to form a beam mouth groove bottom (14) structure.

3. The high-temperature shearing test fixture for the spacer magnetic steel according to claim 1, wherein four corners of the fixture plate body (11) are provided with fixing counter bores (12) for fixing screws to pass through.

4. The high-temperature shear test fixture for a spacer magnet steel according to claim 1, wherein the number, spacing and depth of the first U-shaped slots (13) and the second U-shaped slots (16) are set according to the model of the spacer (2).

5. The high temperature shear test fixture for a spacer magnet steel according to claim 1, wherein the thickness of the baffle plate (15) is not greater than the thickness of the spacer substrate (23) and the width thereof is greater than the diameter of the spacer magnet steel (21).

6. The high temperature shear test fixture for a spacer magnet steel according to claim 1, wherein the width between the two concave clamping grooves (18) is larger than the width of the spacer substrate (23) and the thickness thereof is larger than the thickness of the spacer substrate (23).

7. A high temperature shear test system for a spacer magnet steel, comprising a test fixture (1) according to any one of claims 1 to 6; the test system (100) further comprises:

The test fixture (1) is fixedly connected to the test heat table (4), and a temperature measuring thermocouple (5) is arranged on the test fixture (1);

The test head and the shearing chopper (3) are arranged on the mechanical arm, and the shearing chopper (3) is vertically arranged and can correspondingly perform relative three-dimensional movement with the test clamp (1) above the test heat table (4) along with the mechanical arm;

The control system (6) comprises an acquisition detection circuit (7) connected with the temperature measuring thermocouple (5) and a heat table control circuit (8) electrically connected with the test heat table (4), and the control system is electrically connected with the test head and receives the shearing height, the shearing speed, the implantation speed and the implantation range technological parameters transmitted by the test head.

8. A high temperature shear test method for a spacer magnet steel employing a test system (100) as claimed in claim 7, comprising the steps of:

Step 1: the fastening screw is used for fixedly mounting the test fixture (1) on the test heat table (4) through the fixed counter bore (12), and the top surface and the bottom surface of the fixture plate body (11) are kept upwards and downwards to be in close fit contact with the test heat table (4);

Step 2: the temperature measuring couple (5) is attached to the clamp plate body (11) and connected to the acquisition detection circuit (7), the temperature required by shearing is monitored in real time by the temperature measuring couple (5) and fed back to the heat table control circuit (8), the heat table control circuit (8) controls the test heat table (4) to heat the test clamp (1), and the test clamp (1) heats the annular spacer (2) in a heat transfer mode;

Step 3: when the temperature measuring couple (5) detects that the test fixture (1) is stable to a required temperature value, the ring separator (2) sample is clamped into the concave clamping groove (18) to the baffle (15) along the second U-shaped groove (16) through the ring separator substrate (23) to finish the fixed connection of the ring separator (2) sample and the test fixture (1);

Step 4: correspondingly mounting a shearing chopper (3) and a test head on a mechanical arm, and setting the initial position, the shearing height, the shearing speed, the implantation speed, the lower pressure value and the implantation range technological parameters of the shearing chopper (3);

step 5: after the ring separator (2) reaches the temperature required by the test, the control system (6) controls the mechanical arm to drive the shearing chopper (3) and the test head to apply shearing force to the magnetic steel (21) of the ring separator for high-temperature shearing test according to the shearing process parameter setting of the step 4.