Fourth, choose the appropriate shock-proof cushion The first two steps are to consider the impact and vibration process separately, consider the actual situation, must take both into consideration to design shock and vibration can play a good shock cushion. When applying the cushioning curve, shock buffer curves and vibration transmission data must be used at the same time.
(1) Impact cushioning curve, which refers to the curve of the relationship between maximum transmission shock acceleration and static stress.
In order to select the most economical shock-proof cushion, the same drop height buffer curve as the drop height selected in the first step should be selected, and the type and thickness of the shock-cushion cushion should be selected according to these curves so as to limit the transmission acceleration peak value to be equal to or lower than The g-value of damage determined during the vulnerability test of the second step. In addition, what kind of structure of seismic cushions should be based on the principle of safety and economy. The main structure is described in the previous section. It has a comprehensive shock-proof structure and part of a shock-proof structure.
The main buffer materials have ready-made curves. For those that do not, dynamic buffer tests can be performed to obtain a series of data and draw their buffer curves.
The vertical drop tester and impact tester were used during the test, and a slider with adjustable weight was used to adjust the drop height. Install a speedometer on the falling weight to record acceleration pulses at impact.
Each test generates a data point, and the acceleration peak is read directly by the oscilloscope or read out from the waveform analyzer. Static stress is obtained by dividing the weight of the slider by the buffer area. For each shock-proof cushion thickness and drop height, the data points of the transmission acceleration peaks with respect to different static stress loads are recorded as the basis for drawing the cushion curve.
(2) The transmission rate data refers to the relationship between the natural vibration frequency and the static stress. Figure 8-8 shows an example of reducing the vibration with an anti-vibration cushion at the critical frequency of the product.
However, the curves shown in Figure 8-8 are generally not available, and in most cases, hands-on tests must be performed to obtain reliable buffered vibration data. The shock-absorbing material is mounted on a vibrating machine. With different static stress values, the accelerations of the table and the weights are monitored. A curve similar to the one shown in Figs. 8-8 can be generated during the frequency sweep and can then be recorded as a function of the static stress. The natural frequency.
It should be noted that the design of the anti-vibration cushion must meet both the shock and vibration requirements. In any given anti-shock pad and static stress values, both sets of data must be checked to ensure the transmitted g-value and natural frequency All meet the requirements.
Sometimes, because the vulnerability g value or the critical frequency is too low (or low), the design is difficult. At this time, the level of protection of the design must be sacrificed to a certain extent or more thorough packaging is used. In many cases, in order to reduce the total cost, we must improve the product's robustness.
Fifth, design and manufacture prototype packaging design and manufacturing prototype packaging based on the following:
(1) Obtain and determine relevant information;
(2) The economics of packaging materials;
(3) Other protection issues that need to be considered;
(4) Special shipping requirements;
(5) Packaging closed structure and other special issues.
The prototype package should be very close to the intended final package, and the material, closure, size, weight, etc. must be the same as the final package. This ensures that the prototype package of the test is indeed a representative sample of the final package. Ideally, the prototype package exhibits the same characteristics as the final package would require when tested.
Prototype packaging should be manufactured in a certain quantity to prepare for multiple tests.
6. The test prototype package is a prototypical package of the tested product to demonstrate whether the desired effect has been achieved. It should be noted that for the sake of simplicity, many variables that should be taken into consideration in the design of the previous steps, such as the shape of the shock-absorbing cushion, the friction of the side pads, the sealing of the bottom pad, etc., have to be tested. Therefore, the prototype package must be tested.
1. The impact test is based on the peak value of the transmitted acceleration. The flat drop is the most serious. Therefore, use a flat drop to test the prototype package.
Without guidance, it is difficult to make the package fall repeatedly and repeatedly. The most accurate and repeatable method of producing a truly flat drop is to put the package on the impact tester. When the impact table hits the program device, the impact The table with the package falls and undergoes extremely rapid speed changes. This speed change test is called a step speed test.
The impact machine used can be the same as that used for the vulnerability test, except that different impact procedure devices are used. The program device generates a short time (2 ms or less) shock pulse. The response of the package to these short pulses is similar to the nearly instantaneous speed change that the container receives when it falls flat and free on a hard surface.
In addition, an instrument should be installed on the impact table to observe whether the input speed change is correct. An accelerometer should also be installed on the packaging product to determine whether the peak g value transmitted by the shockproof cushion is still within the vulnerability limit.
In most cases when the package is likely to fall on either side of it, the test should be conducted in two directions on each axis of the three coordinate axes, for a total of six times.
When performing a step speed test, the drop height on the impact machine is first set at a desired height, and then the impact table is raised and dropped. It impacts on rebound, and it is stopped by a rebound brake. Record the acceleration pulse transmitted to the packaged product and the speed change of the impact table. Check the product to determine whether the package can play a protective role. This test can be repeated multiple times to obtain multiple results.
2. The vibration test first subjects the package to a series of frequency sweeps at a predetermined acceleration value, and then observes the stopping test at the resonant frequency. Because the damage is most likely to occur at the resonant frequency, the test is mainly performed at these frequencies.
Fix the package under the vibration frequency curve used in the second step to verify the natural frequency of the shock-absorbing cushion. In general, this work should also be performed on each of the three coordinate axes of the package, and then the vibration machine should be tuned to each resonance point (product, shock-absorbing pad combination, natural frequency and overall product resonance. ) "Stop" the prescribed time period.
Both the sine amplitude and the stop time are arbitrarily determined.
If the performance of the package meets the design requirements in terms of impact and vibration, other tests such as compression, temperature, and humidity can be performed. Otherwise, it must be modified and retested.
As long as the above steps are adhered to, it is possible to prevent the loss of goods in distribution.
(1) Impact cushioning curve, which refers to the curve of the relationship between maximum transmission shock acceleration and static stress.
In order to select the most economical shock-proof cushion, the same drop height buffer curve as the drop height selected in the first step should be selected, and the type and thickness of the shock-cushion cushion should be selected according to these curves so as to limit the transmission acceleration peak value to be equal to or lower than The g-value of damage determined during the vulnerability test of the second step. In addition, what kind of structure of seismic cushions should be based on the principle of safety and economy. The main structure is described in the previous section. It has a comprehensive shock-proof structure and part of a shock-proof structure.
The main buffer materials have ready-made curves. For those that do not, dynamic buffer tests can be performed to obtain a series of data and draw their buffer curves.
The vertical drop tester and impact tester were used during the test, and a slider with adjustable weight was used to adjust the drop height. Install a speedometer on the falling weight to record acceleration pulses at impact.
Each test generates a data point, and the acceleration peak is read directly by the oscilloscope or read out from the waveform analyzer. Static stress is obtained by dividing the weight of the slider by the buffer area. For each shock-proof cushion thickness and drop height, the data points of the transmission acceleration peaks with respect to different static stress loads are recorded as the basis for drawing the cushion curve.
(2) The transmission rate data refers to the relationship between the natural vibration frequency and the static stress. Figure 8-8 shows an example of reducing the vibration with an anti-vibration cushion at the critical frequency of the product.
However, the curves shown in Figure 8-8 are generally not available, and in most cases, hands-on tests must be performed to obtain reliable buffered vibration data. The shock-absorbing material is mounted on a vibrating machine. With different static stress values, the accelerations of the table and the weights are monitored. A curve similar to the one shown in Figs. 8-8 can be generated during the frequency sweep and can then be recorded as a function of the static stress. The natural frequency.
It should be noted that the design of the anti-vibration cushion must meet both the shock and vibration requirements. In any given anti-shock pad and static stress values, both sets of data must be checked to ensure the transmitted g-value and natural frequency All meet the requirements.
Sometimes, because the vulnerability g value or the critical frequency is too low (or low), the design is difficult. At this time, the level of protection of the design must be sacrificed to a certain extent or more thorough packaging is used. In many cases, in order to reduce the total cost, we must improve the product's robustness.
Fifth, design and manufacture prototype packaging design and manufacturing prototype packaging based on the following:
(1) Obtain and determine relevant information;
(2) The economics of packaging materials;
(3) Other protection issues that need to be considered;
(4) Special shipping requirements;
(5) Packaging closed structure and other special issues.
The prototype package should be very close to the intended final package, and the material, closure, size, weight, etc. must be the same as the final package. This ensures that the prototype package of the test is indeed a representative sample of the final package. Ideally, the prototype package exhibits the same characteristics as the final package would require when tested.
Prototype packaging should be manufactured in a certain quantity to prepare for multiple tests.
6. The test prototype package is a prototypical package of the tested product to demonstrate whether the desired effect has been achieved. It should be noted that for the sake of simplicity, many variables that should be taken into consideration in the design of the previous steps, such as the shape of the shock-absorbing cushion, the friction of the side pads, the sealing of the bottom pad, etc., have to be tested. Therefore, the prototype package must be tested.
1. The impact test is based on the peak value of the transmitted acceleration. The flat drop is the most serious. Therefore, use a flat drop to test the prototype package.
Without guidance, it is difficult to make the package fall repeatedly and repeatedly. The most accurate and repeatable method of producing a truly flat drop is to put the package on the impact tester. When the impact table hits the program device, the impact The table with the package falls and undergoes extremely rapid speed changes. This speed change test is called a step speed test.
The impact machine used can be the same as that used for the vulnerability test, except that different impact procedure devices are used. The program device generates a short time (2 ms or less) shock pulse. The response of the package to these short pulses is similar to the nearly instantaneous speed change that the container receives when it falls flat and free on a hard surface.
In addition, an instrument should be installed on the impact table to observe whether the input speed change is correct. An accelerometer should also be installed on the packaging product to determine whether the peak g value transmitted by the shockproof cushion is still within the vulnerability limit.
In most cases when the package is likely to fall on either side of it, the test should be conducted in two directions on each axis of the three coordinate axes, for a total of six times.
When performing a step speed test, the drop height on the impact machine is first set at a desired height, and then the impact table is raised and dropped. It impacts on rebound, and it is stopped by a rebound brake. Record the acceleration pulse transmitted to the packaged product and the speed change of the impact table. Check the product to determine whether the package can play a protective role. This test can be repeated multiple times to obtain multiple results.
2. The vibration test first subjects the package to a series of frequency sweeps at a predetermined acceleration value, and then observes the stopping test at the resonant frequency. Because the damage is most likely to occur at the resonant frequency, the test is mainly performed at these frequencies.
Fix the package under the vibration frequency curve used in the second step to verify the natural frequency of the shock-absorbing cushion. In general, this work should also be performed on each of the three coordinate axes of the package, and then the vibration machine should be tuned to each resonance point (product, shock-absorbing pad combination, natural frequency and overall product resonance. ) "Stop" the prescribed time period.
Both the sine amplitude and the stop time are arbitrarily determined.
If the performance of the package meets the design requirements in terms of impact and vibration, other tests such as compression, temperature, and humidity can be performed. Otherwise, it must be modified and retested.
As long as the above steps are adhered to, it is possible to prevent the loss of goods in distribution.
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