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Home >> Products >> Biaxial & Triaxial Testing Machines >> Acrylic sheet four-axis stretching machine, acrylic stretching machine

acrylic sheet biaxial stretching testing machine

Acrylic sheet four-axis stretching machine, acrylic stretching machine

Model: UT1029AC-600-4;

Acrylic sheet four-axis stretching machine, acrylic stretching machine, acrylic sheet biaxial stretching testing machine is specially designed for acrylic sheets (including molding, extrusion, and casting), and is mainly used to complete the following test tasks and adapt to the needs of different scenarios:

• Four-axis synchronous tensile test: simulate the mechanical behavior of acrylic sheets under uniform and multi-directional stress, and measure their yield strength, tensile strength, elongation at break and other indicators during bidirectional synchronous tensile, which are suitable for the practical application scenarios of large-area acrylic plates.

• Four-axis asynchronous tensile test: The tensile rate in the X and Y directions can be adjusted independently, the deformation and failure process of acrylic plates under non-uniform multi-directional stress can be simulated, and the differences in mechanical properties in all directions can be analyzed.

• Expanded applications: Compatible with one-way tensile and bi-directional tensile tests, which can meet the mechanical properties of acrylic sheets of different specifications and thicknesses, and can be used as industrial machine tools.

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General Introduction

This acrylic plate four-axis tensile testing machine adopts the overall structure of "high rigidity frame + four-axis linkage transmission + precise measurement and control system", which is divided into mechanical system, measurement and control system, software system, heating module, cooling and water drive, material conveying module, six modules, and each module works together to ensure tensile accuracy and ease of operation.

Acrylic sheet four-axis stretching machine, acrylic stretching machine

Main features

Transmission system
Frame structure
Clamping and driving system
Safety protection system
Test Procedure

It adopts the transmission combination of "AC servo motor + precision ball screw + linear guide", four-axis independent drive, and is equipped with a linkage compensation mechanism (using a 4-axis machining center algorithm) to achieve precise control of four-axis synchronous/asynchronous stretching. The servo motor is selected from a high-performance brand, with a speed regulation ratio of up to 1:100, smooth operation and low noise; The precision level of the ball screw reaches C3 level, and there is no gap transmission to ensure the accuracy of tensile rate and displacement control; The linear guide rail adopts a high-rigidity model, and two sets of guide rails are arranged under each set of tensile clamps, which play the function of anti-rotation during guidance and stretching, ensure that the clamp and beam operate synchronously when moving, avoid jamming and offset, and adapt to the smooth stress requirements during the stretching process of acrylic plates.

Acrylic sheet four-axis stretching machine, acrylic stretching machine

It adopts an integral steel plate welding frame, which is aged to eliminate internal stress, and the surface is electrostatic sprayed, which is anti-corrosion and easy to clean. The frame is designed with a cross-shaped four-axis layout, and the four tensile main beams are cross-arranged to ensure that the force is uniform in the X and Y directions, and the frame has high rigidity and no deformation, which minimizes the vibration interference during the test process and ensures that the center position remains unchanged during the synchronous stretching of the four axes, which meets the design requirements of the high rigidity testing machine.

For the characteristics of acrylic plate with moderate hardness, easy to brittle cracking, and easy surface scratches, customized special single-sided clamping fixtures, the core design is as follows:

• The clamping length is 90mm, and the hydraulic locking method is firmly clamped to avoid the specimen slipping and falling off during the test, and to ensure accurate force transmission.

• The jaws are water-flowing inside and have a mesh tooth shape, which effectively prevents deformation caused by clamping under the premise of ensuring clamping reliability.

• The jaws can be flexibly adjusted according to the size and thickness of the specimen, and can be adapted to different thicknesses of acrylic plate specimens, which is highly versatile.

• The fixture is firmly connected with the tensile main beam, and the concentricity error is ≤ 0.1mm to ensure that the force is uniform during four-axis stretching and avoid the premature fracture of the specimen due to force offset. The transmission bearing part adopts special bearings with small thermal deformation, and the bearing fit within 180 degrees has almost no change. (Note: The main drive beam is processed with the same material as the bearing, which can effectively package the fit tolerance of the entire mechanism when loading in the high temperature section.) ）

• The main drive beam is made of high-temperature bearing steel, and the internal waterway is equipped to ensure that the beam is always within 100°C during the whole loading process.

Acrylic sheet four-axis stretching machine, acrylic stretching machine

Equipped with multiple safety protection devices to ensure the safety of equipment, operators and specimens, in line with the safety specifications of the testing machine:

• Mechanical limit protection: set up a mechanical limit block at the end of the four-axis stretching stroke to prevent equipment damage caused by excessive stretching;

• Force value overload protection: When the test force exceeds the set upper limit (110% maximum test force), the equipment will automatically stop to avoid damage to the sensor and transmission system;

• Emergency stop protection: equipped with an emergency stop button, which can quickly stop the machine in case of sudden failures (such as specimen fracture and splashing, equipment abnormality) to ensure the safety of operators;

• Electrical protection: The electrical control line refers to international standards, with overcurrent, overvoltage, overspeed, overload and other protection devices, with strong anti-interference ability to ensure the stable operation of the controller;

• Preload protection function: Avoid sensor overshoot damage caused by high-speed start, and protect the safety of the force sensor and operator.

Combined with the characteristics of acrylic board and relevant test standards, design a standardized test process to ensure that the test operation is standardized, the data is accurate, and the whole process is traceable, the specific steps are as follows:

Preparation before the test

1. Specimen preparation: According to the requirements of relevant standards, the preparation of acrylic plate specimens is recommended, cross-shaped or square specimens, the minimum size is 1500×1500mm, the thickness is determined according to the actual testing needs (1~50mm), the surface of the specimen should be smooth, no damage, no cracks, no burrs on the edges, and prepared by machining (milling or stamping) to ensure dimensional accuracy (parallel section width and thickness errors meet the standard requirements);

2. Place the specimen on the feeding trolley, adjust the height, and wait to enter the stretching area;

3. Equipment power-on: turn on the power supply of the equipment, check whether the electrical system, transmission system, and clamping system are normal, complete the calibration of the force value and displacement zero point, check whether the sensor connection is firm, and whether the software is running normally;

4. Parameter setting: Open the test software, call or create a new test plan, set the test type (synchronous/asynchronous tensile), tensile rate, upper limit of force value, upper limit of displacement, upper limit of strain, etc., save the scheme and confirm that it is correct.

5. Turn on the hydraulic system and hydraulic cooling system, turn on the heating system, preheat the cavity, confirm that it is correct, and push the specimen in.

Specimen clamping

1. The computer sets the clamp retraction position, automatically retracts, and clamps the specimen, and the tightening force can be adjusted;

2. The feeding trolley falls and moves out of the stretching area.

3. Turn off the heating zone and turn on the heating. When the heating time arrives, prepare the experiment

Test operation

1. After confirming that the specimen is clamped correctly and the parameters are correct, click the software "Start" button, and the equipment begins to carry out four-axis tensile testing according to the preset scheme.

2. During the test, observe the test data, curve and equipment operation status in real time, and immediately click the "pause" or "emergency stop" button to deal with the fault before continuing the test.

3. After the specimen is pulled to size, stop heating, turn on the strong wind mode, and cool the specimen.

4. After the temperature drops to room temperature, push into the trolley, rise to the specified height, catch the specimen, open the fixture, the fixture retreats, lower the trolley, and remove the stretched specimen.

Post-test treatment

1. View the test data and curves in the software, analyze the abnormal data, eliminate invalid test data, and calculate the average mechanical index of the valid sample;

2. Generate a test report, check that the content of the report is correct, print or export the report, and archive it for future reference.

3. Turn off the power supply of the equipment, cut off the total power supply, make a record of the use of the equipment, and complete the whole process of the test.

Main Technical Specification

Combined with the characteristics of acrylic plate that is easy to brittle, moderate hardness and diverse sizes, the core technical indicators of the equipment are as follows, which can be customized and adjusted according to user needs:

Indicator name	Technical parameters	Note:
Maximum test force (total tensile force).	600kN	Adapt to acrylic sheets of different thicknesses (8~50mm).
Accuracy level of the testing machine	Level 1	Relative error of force value indication± 0.5% (1%~100% range)
Test force resolution	1/300000, the whole process is not classified	High-precision force sensors are selected to ensure accurate collection of small force values
Stretch rate adjustment range	0.1~240mm/min	When the rate ≥ 0.5mm/min, the control accuracy ± 0.5%; Stepless speed adjustment is possible
Displacement measurement range	0~780mm (single side)	Displacement resolution 0.005mm, display error ±0.5%
Effectively stretches the space	3000×3000mm (Customizable)	The minimum size of the adaptable specimen is 1500×1500mm
Clamping method	Unilateral clamping, mechanical locking	The clamping length is 50mm, and the jaws are inlaid with soft materials to prevent scratches
Control mode	Force control, displacement control, strain control (three closed loops)	It supports four-axis linkage compensation to ensure that the center position remains unchanged during stretching
Ambient chamber temperature range	Temperature 80~200°C,	According to the requirements of the sample high-temperature stretching process
Power Specifications:	AC 380V±10%,50Hz,50kW	It needs to be grounded reliably to ensure the stable operation of the equipment
Equipment footprint size	11500×7500×1850mm (Customizable)	The body adopts a high rigidity design to reduce test vibration
Circulating water temperature range	Temperature 25~45°C,	Compressor cooling
Number of fixtures	104+41	The number of fixtures is expandable
Jaw size	Length * width (80*90)	Material: 316
Clamping method	0.1~5MPa adjustable	Hydraulic drive (water drive)

Main Accessories

Serial number	Part name	Specification model	quantity	Note:
1	Main frame rack	Cross-shaped four-axis layout, steel plate welding, electrostatic spraying	1 unit	High rigidity to eliminate internal stress
2	servo motor	AC servo, speed regulation ratio 1:100000	4 units	Four-axis independent drive for smooth operation
3	Ball screw	C3 level, no gaps	4 sets	Precision transmission to ensure displacement accuracy
4	Linear guide	High rigidity, anti-rotation guidance	8 sets	Each set of fixtures is equipped with 2 sets for stable guidance
5	Pull sensor	0.5 steps, resolution 1/300000	4	1 for each of the four axles, accurate force measurement
6	Displacement sensor	Raster type, resolution 0.025mm	4	1 for each of the four axes, accurate measurement of displacement
7	Special fixtures	Unilateral clamping, soft jaws, mechanical locking	44 sets	Anti-scratch and adapted to acrylic boards
8	Heating and hydraulic systems		One set each	The hydraulic system is automatically cooled
9	measurement and control system	Full digital closed-loop, 24-bit A/D conversion	1 set	Four-axis linkage compensation, accurate measurement and control
10	Experiment with software	ConquerTest software	1 set	Includes data collection, analysis, and report generation
11	Touch the computer	21-inch LCD color touch control screen	2	Stretching, temperature control and water pressure
12	Control cabinet	Integrated electrical components, shielded wiring	1 unit	Anti-interference and easy to access
13	Auxiliary tools	Digital calipers, sample preparation tools, etc	1 set	It is used in conjunction to ensure the smooth progress of the test
14	Technical information	Manuals, standard manuals, and operation training materials	1 set	Guide equipment operation and maintenance

Industry background

As an important transparent polymer material, acrylic sheet (polymethyl methacrylate, PMMA) is widely used in architectural lighting, automotive components, electronic displays, advertising signs and other fields with excellent light transmittance, weather resistance and mechanical properties.

The core reason is that the structural optimization of tensile modification is due to the synergistic effect of high temperature and four-axis synchronous stretching, making up for the inherent structural defects of the base metal and optimizing the molecular arrangement, so as to achieve a significant improvement in mechanical properties, the specific analysis is as follows:

Although its molecular structure is a linear polymer, it is in a natural and disordered arrangement, and the production process (such as casting, extrusion) is prone to microporosity, molecular entanglement, local stress unevenness and other inherent defects, which directly limit its mechanical properties.

Acrylic sheet four-axis stretching machine, acrylic stretching machine

The molecular chains of the untreated acrylic board base metal are randomly arranged, and the intermolecular forces are dispersed when stressed, which is easy to generate stress concentration at the defect, resulting in obvious shortcomings in its mechanical properties: the tensile strength is usually 60-80MPa, the elongation at break is about 3-5%, the impact resistance is weak, and there is a certain anisotropy (due to the slight orientation of the molecular chain in the production process), which cannot meet the demand for high strength, high toughness and uniform stress of materials in high-end application scenarios. At the same time, the existence of micropores inside the base metal will reduce its deformation resistance and structural stability, and it is prone to creep, cracking and other problems under long-term stress.

Compared with the modified acrylic board, the core shortcomings of the base metal are that the molecular arrangement is disordered, there are many internal defects, and the bonding force between molecules has not been fully utilized, so there is a lot of room for improvement in its mechanical properties, and the high-temperature four-axis synchronous stretching process is the key means to solve this problem.

The synergistic effect of high-temperature heating and four-axis synchronous stretching is the core reason why the mechanical properties of acrylic sheets far exceed those of the base metal, and its modification mechanism is mainly reflected in three aspects, through precise optimization of molecular structure and elimination of inherent defects, to achieve all-round improvement of mechanical properties:

First, the molecular chains are arranged in multiple directions to strengthen the intermolecular force. In a high-temperature environment (usually 100-180°C, close to the thermal deformation temperature of acrylic plate), the molecular chain of the base metal is freed from the constraints and the activity is enhanced, and the molecular chain is evenly stressed in the X and Y directions through synchronous stretching in four axes, changing from the original loose and disordered arrangement to a regular and tight multi-directional directional arrangement. After the molecular chain orientation, the van der Waals force and chemical bond bond between molecules are more closely bonded, and the stress can be quickly and uniformly transferred to each molecular chain under force, which greatly improves the strength and toughness of the material, and effectively solves the mechanical shortcomings caused by the disordered arrangement of the base metal molecules.

The second is to eliminate internal defects and reduce stress concentration.