CN106840494A - A kind of internal stress detection method of engineering plastics sheet material - Google Patents
A kind of internal stress detection method of engineering plastics sheet material Download PDFInfo
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- CN106840494A CN106840494A CN201710057747.4A CN201710057747A CN106840494A CN 106840494 A CN106840494 A CN 106840494A CN 201710057747 A CN201710057747 A CN 201710057747A CN 106840494 A CN106840494 A CN 106840494A
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- pom plate
- pom
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- internal stress
- detection method
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of internal stress detection method of engineering plastics sheet material, comprise the following steps：1) thickness is taken for 20mm, width are one piece of the POM plate of 600mm；2) on horizontal sliding sawing machine, 300mm is cut along extrusion direction, obtains one piece of POM plate of 300mm × 600mm；POM plate both sides are cut into 50mm respectively along the direction of width 600mm again, one piece of POM plate of 300mm × 500mm is finally obtained；3) the POM plate bar of the strip that some width are 20mm is cut into along 300mm directions；4) each 1 POM plate bar of both sides and centre is taken, 3 POM plate bars are split up and down along central part respectively.5) two strip POM plate bars after respectively will be split are respectively placed on horizontal plane, are alignd two-by-two along split face, the maximum between measurement two ends arc, have 3 values, and the average value of 3 value sums is this batch of stress value of POM plate.The internal stress detection method step of engineering plastics sheet material of the invention is simple, and by this measuring method, we can intuitively obtain the stress value of plastics material internal residual very much.
Description
Technical field
The present invention relates to a kind of internal stress detection method of engineering plastics sheet material.
Background technology
Its material internal can all produce internal stress after thermoforming for thermoplastic plastic plate and bar, and we are necessary to do
How clear this internal stress produces.Certainly, herein we discuss be macroscopical internal stress, as intramolecular micro-
Internal stress is seen not in the row of our discussion.It is summed up this internal stress and is substantially divided to two kinds；1) internal stress, high temperature plastics are orientated
During mold filling and pressurize feed supplement, macromolecular chain orients conception is frozen and produces one to melt along the arrangement of melt flows direction
Plant internal stress.Orientation stress produce process be：As a example by extruding POM bars.POM particles are by extruder heating and screw rod
Fusion plastification after shear action, then by screw extruding to head, cooling and shaping device is entered after head is pressurized, cooling is fixed
Type device has a circulating cooling water jacket, the POM melts of high temperature in the presence of cooling jacket, the rapid crystal hardened in its top layer,
And the center portion thereof position or fluid state, the speed that top layer and central part are promoted forward in this state is different, there is one
The presence of individual speed difference.This also has led to being orientated the generation of internal stress.2) internal stress is cooled down, it is understood that on the top layer of sheet material
There is temperature difference higher with central part, sheet material top layer cooled and solidified first is shunk, and its core or high temperature hot melt state, this
Sample core will limit the contraction on top layer, cause core to be in compressive stress state, and top layer is in tensile stress state.Here it is cold
But the mechanism that internal stress is produced.
The presence of internal stress, using very big hidden danger is left, was not processed the later stage of material by good stress-removal
Plastics material is easily deformed and bursts when being machined out.Unfortunately up to the present can also be to modeling without a kind of instrument
Stress inside material products checked, can carry out intuitively reading with let us.Most commonly " reagent infusion method ", that is, exist
Under normal temperature and pressure conditionses, plastic products sample is put into special detection reagent solution the inside immersion, about 2 minutes, Ran Houqu
Go out to dry, watch face crack, crackle is bigger to represent that stress is bigger.This detection method is very extensive, it is impossible to directly perceived to quantify to answer
Power, cannot detect, it may be said that better than nothing at all for bulky product.So, one kind can intuitively quantify plastics material
The detection method of internal stress just seems very urgent and important.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of internal stress detection method of engineering plastics sheet material.
The internal stress detection method of engineering plastics sheet material of the invention, comprises the following steps：
1) thickness is taken for 20mm, width are one piece of the POM plate of 600mm；
2) on horizontal sliding sawing machine, 300mm is cut along extrusion direction, obtains one piece of POM plate of 300mm × 600mm；Again along width
POM plate both sides are cut 50mm by the direction for spending 600mm respectively, finally obtain one piece of POM plate of 300mm × 500mm；
3) on horizontal sliding sawing machine, it is 20mm's that the POM plate of 300mm × 500mm is cut into some width along 300mm directions
The POM plate bar of strip；
4) each 1 POM plate bar of both sides and centre is taken, totally 3 POM plate bars, by 3 POM plate bars respectively along central part
Under it is split；
5) two strip POM plate bars after respectively will be split are respectively placed on horizontal plane, are alignd two-by-two along split face, two sections
The bar being harmonious curved can change in the horizontal plane, the maximum between measurement two ends arc, have 3 values, and 3 are worth it
The average value of sum is this batch of stress value of POM plate.
The internal stress detection method of engineering plastics sheet material of the invention, in step 5) in：Between measurement two ends arc most
It is defined by cutting the measured value after standing 1 hour during big value.
Beneficial effects of the present invention are compared with prior art：The internal stress detection method of engineering plastics sheet material of the invention
Step is simple, and by this measuring method, we can intuitively obtain the stress value of plastics material internal residual very much, easily
Operation.
Brief description of the drawings
Fig. 1 be a kind of engineering plastics sheet material described in the embodiment of the present invention 1 internal stress detection method in POM plate bar it is split
Structural representation afterwards；
Fig. 2 be the POM bars described in the embodiment of the present invention 2 internal stress detection method in POM bars it is split after structure
Schematic diagram.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the invention is described in further detail.Hereinafter implement
Example is not limited to the scope of the present invention for illustrating the present invention.
Embodiment 1
A kind of internal stress detection method of engineering plastics sheet material, comprises the following steps：
1) thickness is taken for 20mm, width are one piece of the POM plate of 600mm；
2) on horizontal sliding sawing machine, 300mm is cut along extrusion direction, obtains one piece of POM plate of 300mm × 600mm；Again along width
POM plate both sides are cut 50mm by the direction for spending 600mm respectively, finally obtain one piece of POM plate of 300mm × 500mm；
3) on horizontal sliding sawing machine, it is 20mm's that the POM plate of 300mm × 500mm is cut into some width along 300mm directions
The POM plate bar of strip；
4) each 1 POM plate bar of both sides and centre is taken, totally 3 POM plate bars, by 3 POM plate bars respectively along central part
Under it is split；
5) two strip POM plate bars after respectively will be split are respectively placed on horizontal plane, are alignd two-by-two along split face, two sections
The bar being harmonious curved can change in the horizontal plane, the maximum between measurement two ends arc, have 3 values, and 3 are worth it
The average value of sum is this batch of stress value of POM plate.
The internal stress detection method of engineering plastics sheet material of the invention, in step 5) in：Between measurement two ends arc most
It is defined by cutting the measured value after standing 1 hour during big value.
Embodiment 2
As shown in Fig. 2 the internal stress detection method of engineering plastics sheet material of the invention, is equally applicable to the interior of POM bars
Stress mornitoring, the internal stress detection of POM bars is comprised the following steps：
1) diameter 50mm, the white POM bars one of length 1000mm are taken；
2) on horizontal sliding sawing machine, the line centered on the bar center of circle takes bar central part along center line, and thickness is 20mm；
3) on horizontal sliding sawing machine, the direction of the bar central part that will be removed diametrically 50mm is split；
4) two bars after will be split are placed on horizontal plane, are alignd two-by-two along split face.Because balanced structure is broken
Bad, the stress of POM bar internal residuals starts release, and we can be had found in the presence of stress, and two sections of bars being harmonious exist
Can curved change on horizontal plane.Maximum between measurement two ends arc is stress value, and stress becomes non-before us
Chang Zhiguan.In the method, it is final stress value to cut the measured value after standing 1 hour.
The internal stress detection method step of engineering plastics sheet material of the invention is simple, and by this measuring method, we can
The stress value of plastics material internal residual is intuitively obtained very much, easily operation.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of the technology of the present invention principle is not departed from, some improvement and modification can also be made, these are improved and modification
Also should be regarded as protection scope of the present invention.
Claims (2)
1. a kind of internal stress detection method of engineering plastics sheet material, it is characterised in that comprise the following steps：
1) thickness is taken for 20mm, width are one piece of the POM plate of 600mm；
2) on horizontal sliding sawing machine, 300mm is cut along extrusion direction, obtains one piece of POM plate of 300mm × 600mm；Again along width
POM plate both sides are cut 50mm by the direction of 600mm respectively, finally obtain one piece of POM plate of 300mm × 500mm；
3) on horizontal sliding sawing machine, the POM plate of 300mm × 500mm is cut into the strip that some width are 20mm along 300mm directions
POM plate bar；
4) each 1 POM plate bar of both sides and centre is taken, totally 3 POM plate bars, right up and down along central part respectively by 3 POM plate bars
Open；
5) two strip POM plate bars after respectively will be split are respectively placed on horizontal plane, are alignd two-by-two along split face, and two sections are harmonious
Bar curved can change in the horizontal plane, the maximum between measurement two ends arc has 3 values, and 3 are worth sum
Average value is this batch of stress value of POM plate.
2. the internal stress detection method of engineering plastics sheet material according to claim 1, it is characterised in that in step 5) in：
It is defined by cutting the measured value after standing 1 hour when measuring the maximum between the arc of two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710057747.4A CN106840494A (en) | 2017-01-23 | 2017-01-23 | A kind of internal stress detection method of engineering plastics sheet material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710057747.4A CN106840494A (en) | 2017-01-23 | 2017-01-23 | A kind of internal stress detection method of engineering plastics sheet material |
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| Publication Number | Publication Date |
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| CN106840494A true CN106840494A (en) | 2017-06-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710057747.4A Pending CN106840494A (en) | 2017-01-23 | 2017-01-23 | A kind of internal stress detection method of engineering plastics sheet material |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55166019A (en) * | 1979-06-11 | 1980-12-24 | Matsushita Electric Ind Co Ltd | Measuring method of internal stress of precipitated metal |
| CN1474170A (en) * | 2003-06-27 | 2004-02-11 | 太原钢铁(集团)有限公司 | Detecting method for cold rolled steel strip inner stress |
| CN101858851A (en) * | 2009-04-06 | 2010-10-13 | 宝理塑料株式会社 | Residual stress calculation method and residual stress distribution derivation method |
| CN102156010A (en) * | 2010-12-30 | 2011-08-17 | 首钢总公司 | Internal stress measuring method of opening plate |
| CN102818763A (en) * | 2012-07-30 | 2012-12-12 | 首钢总公司 | Hot-rolled steel plate residual stress calculating method suitable to production field |
| CN103076115A (en) * | 2011-10-07 | 2013-05-01 | 空中客车运营有限公司 | Method and apparatus for measuring residual stresses in a component |
-
2017
- 2017-01-23 CN CN201710057747.4A patent/CN106840494A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55166019A (en) * | 1979-06-11 | 1980-12-24 | Matsushita Electric Ind Co Ltd | Measuring method of internal stress of precipitated metal |
| CN1474170A (en) * | 2003-06-27 | 2004-02-11 | 太原钢铁(集团)有限公司 | Detecting method for cold rolled steel strip inner stress |
| CN101858851A (en) * | 2009-04-06 | 2010-10-13 | 宝理塑料株式会社 | Residual stress calculation method and residual stress distribution derivation method |
| CN102156010A (en) * | 2010-12-30 | 2011-08-17 | 首钢总公司 | Internal stress measuring method of opening plate |
| CN103076115A (en) * | 2011-10-07 | 2013-05-01 | 空中客车运营有限公司 | Method and apparatus for measuring residual stresses in a component |
| CN102818763A (en) * | 2012-07-30 | 2012-12-12 | 首钢总公司 | Hot-rolled steel plate residual stress calculating method suitable to production field |
Non-Patent Citations (1)
| Title |
|---|
| 郝如江等: "注塑件残余应力的测试方法", 《工程塑料应用》 * |
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Application publication date: 20170613 |
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| RJ01 | Rejection of invention patent application after publication |