CN111413212A - Device and method for testing bending strength of injection molding material - Google Patents
Device and method for testing bending strength of injection molding material Download PDFInfo
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- CN111413212A CN111413212A CN202010356264.6A CN202010356264A CN111413212A CN 111413212 A CN111413212 A CN 111413212A CN 202010356264 A CN202010356264 A CN 202010356264A CN 111413212 A CN111413212 A CN 111413212A
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000005452 bending Methods 0.000 title claims abstract description 38
- 238000001746 injection moulding Methods 0.000 title claims abstract description 38
- 239000012778 molding material Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 17
- 238000005266 casting Methods 0.000 description 5
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 4
- 229910001172 neodymium magnet Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 2
- 229920000299 Nylon 12 Polymers 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a device and a method for testing the bending strength of an injection molding material, which are used for testing the bending strength of the injection molding material, wherein an injection molding tapered gate is used as a test sample (1) used for testing, and the device comprises a testing device base body (2) and a dynamometer (3); the base body (2) is provided with a conical mounting hole, and the size and the taper of the conical mounting hole are the same as those of the small-end conical section of the conical sprue sample (1); the small end cone section of the sample (1) is embedded into the cone-shaped mounting hole, the large end cone section of the sample (1) is arranged in a cantilever mode, the dynamometer (3) is arranged at the end portion of the large end of the sample (1), acting force is applied, and testing is conducted. The existing pouring gate is adopted for testing, a sample does not need to be prepared additionally, the cost is saved, the working efficiency is improved, the testing result is accurate, and the engineering requirement can be met.
Description
Technical Field
The invention relates to the technical field of material testing and mechanical structures, in particular to a device and a method for testing bending strength of an injection molding material
Background
At present, the commonly used method for testing the bending strength of the material is a three-point bending method, the three standards are ISO178 of the International organization for standardization, ASTM D790 of the American society for testing materials are different from the Chinese national standard GB/T9341-.
Taking GB/T9341-2008 as an example, the testing principle is shown in FIG. 1, the existing testing methods all need to prepare samples, prepare the samples into corresponding standard samples (injection molding or cutting processing), and test the bending strength of the material on a high-precision universal testing machine according to the test standard:
in the formula:
σ0: bending stress or bending strength, unit: megapascals, MPa;
f: force applied, in units: newton, N;
L0: span, unit: millimeters, mm;
b: sample width, unit: millimeters, mm;
h: sample thickness, unit: mm, mm.
In the plastic industry and related industries, the bending strength of an injection molding material is an important mechanical property index, on one hand, for testing, a mold is processed according to the standard size, a standard sample strip is injection molded, and the bending strength of the material is tested on a universal testing machine, on the other hand, the plastic is used for forming a certain product, a pouring gate is generated in the product forming process, the pouring gate is abandoned in the past, or is refilled for the second time, so that one-time waste is caused, and the sample for preparing the test needs to be manufactured independently or cut the existing finished product, so that another-time waste is caused.
Disclosure of Invention
The invention aims to provide a device and a method for testing the bending strength of an injection molding material.
The purpose of the invention is realized by the following technical scheme:
a testing device for the bending strength of an injection molding material is used for testing the bending strength of the injection molding material, and a conical sprue of an injection molding and casting part is used as a test sample 1 for testing, and comprises a testing device base body 2 and a dynamometer 3;
the base body 2 is provided with a conical mounting hole, and the size and the taper of the conical mounting hole are the same as those of the small-end conical section of the conical sprue sample 1; during sample 1's tip cone embedding toper mounting hole, sample 1's main aspects cone cantilever setting, dynamometer 3 locates sample 1 main aspects tip, applys the effort, tests.
The size of the small-end conical section of the sample 1 embedded into the conical mounting hole is 20% -40% of the total length of the sample 1.
The size of the small-end conical section of the sample 1 embedded into the conical mounting hole is 5-10 times of the diameter of the large-end hole of the conical mounting hole.
A method for testing the bending strength of injection molding and casting materials, comprising:
step 4, applying an acting force to the sample 1 at the end part of the large end of the sample 1 through the dynamometer 3 until the sample 1 is broken, and capturing a maximum force value F through the dynamometer 3;
the flexural strength of sample 1 is then:
in the formula:
σ: bending strength, unit: megapascals, MPa;
f: force applied, in units: newton, N; the maximum force value F captured by the dynamometer (3);
l, cantilever length, unit is millimeter, mm;
d: diameter of the big end hole of the conical mounting hole, unit: millimeters, mm;
and L/d is 5-15.
According to the technical scheme provided by the invention, the device and the method for testing the bending strength of the injection molding material provided by the embodiment of the invention adopt the existing pouring gate for testing, no additional sample is required to be prepared, the cost is saved, the working efficiency is improved, the test result is accurate, and the engineering requirement can be met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art bending strength testing apparatus;
fig. 2 is a schematic structural diagram of a device for testing bending strength of an injection molding material according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of an apparatus for testing bending strength of an injection molding material according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example one
As shown in fig. 2 and 3, a device for testing the bending strength of an injection molding material is used for testing the bending strength of an injection molding part material, and is mainly characterized in that a tapered gate of an injection molding part is used as a test sample 1 for testing, and the device comprises a testing device base body 2 and a dynamometer 3; the base body 2 is provided with a conical mounting hole, and the size and the taper of the conical mounting hole are the same as those of the small-end conical section of the conical sprue sample 1; during sample 1's tip cone embedding toper mounting hole, sample 1's main aspects cone cantilever setting, dynamometer 3 locates sample 1 main aspects tip, applys the effort, tests. The dynamometer 3 can be a digital display dynamometer SH500N of a mountain-degree (short for manufacturer).
In order to ensure that the sample 1 is stable and does not fall off during testing, the size of the small-end conical section of the sample 1 embedded into the conical mounting hole is controlled in the following two ways:
firstly, the size of the small-end conical section of the sample 1 embedded into the conical mounting hole is 20% -40% of the total length of the sample 1;
secondly, the size of the small-end conical section of the sample 1 embedded into the conical mounting hole is 5-10 times of the diameter of the large-end hole of the conical mounting hole.
Example two
As shown in fig. 2 and 3, a method for testing bending strength of injection molding and casting material includes:
step 4, applying an acting force to the sample 1 at the end part of the large end of the sample 1 through the dynamometer 3 until the sample 1 is broken, and capturing a maximum force value F through the dynamometer 3;
the flexural strength of sample 1 is then:
in the formula:
σ: bending stress, unit: megapascals, MPa; also known as bending strength;
f: force applied, in units: newton, N; the maximum force value F captured by the dynamometer 3;
l, cantilever length, unit is millimeter, mm;
d: diameter of the big end hole of the conical mounting hole, unit: mm, mm.
In order to ensure the accuracy of measurement, the size is limited to L/d being 5-15.
EXAMPLE III
(1) Two different magnetic injection molding materials are selected, and specifically: a is nylon 12 injection molding neodymium iron boron material, B is polyphenylene sulfide injection molding neodymium iron boron material, and the injection molding conditions are as follows:
the injection molded magnetic material was tested for a standard sample of phi 10mm × 10mm and the flexural strength data of the material was tested using a gate.
(2) Two different magnetic injection molding materials are selected, and specifically: a is nylon 12 injection molding neodymium iron boron material, B is polyphenylene sulfide injection molding neodymium iron boron material, and the injection molding conditions are as follows
Standard specimens conforming to ASTM-790 were injection-molded, and the flexural strength of the material was tested using a UTM-1422 (available from King testing instruments, Inc., of Chengde, Ltd.).
The flexural strength after injection molding was tested as follows:
| F(N) | L(mm) | d(mm) | σ(MPa) | |
| A1 | 23 | 25.09 | 4.01 | 91.2 |
| B1 | 21 | 25.09 | 4.01 | 83.3 |
| A2 | / | / | / | 90.5 |
| B2 | / | / | / | 82.5 |
it can be seen that the results of the two methods are not very different.
It can be seen from the above embodiments that in this embodiment, the conical gate of the injection-molded part is used as the sample 1 for testing, a cantilever measurement method different from the three-point bending method in the prior art is adopted, so that the cost is saved, and meanwhile, the sample 1 is directly taken from the part and can more directly reflect the bending strength of the part, so that the strength of the material can be accurately judged.
Meanwhile, in the plastic magnetic industry, the injection molding magnetic material mainly comprises two major indexes of magnetic property and mechanical property, the existing preparation method is that a magnetic property standard sample is separated from a bending strength test sample, two molds are required to be prepared, one standard sample column with phi 10 x 7 is used for testing the magnetic property of the material, and the other standard sample column is used for preparing a bending strength test sample strip according to the ISO178, GB/T9341-.
After the invention is adopted, the sprue in the preparation process of the standard sample column for testing the magnetic property of the material can be utilized, and the sprue is used as a sample for testing the bending strength to test the bending strength, so that only one injection mold can be prepared, the standard sample column for testing the magnetic property can be prepared, the bending strength of the sample can be tested through the sprue, and the material cost is greatly saved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A test device for the bending strength of injection molding materials is used for testing the bending strength of the injection molding materials, and is characterized in that: the method comprises the following steps of taking a conical sprue of an injection molding part as a test sample (1) for testing, wherein the test sample comprises a testing device base body (2) and a dynamometer (3);
the base body (2) is provided with a conical mounting hole, and the size and the taper of the conical mounting hole are the same as those of the small-end conical section of the conical sprue sample (1); the small end cone section of the sample (1) is embedded into the cone-shaped mounting hole, the large end cone section of the sample (1) is arranged in a cantilever mode, the dynamometer (3) is arranged at the end portion of the large end of the sample (1), acting force is applied, and testing is conducted.
2. An apparatus for testing bending strength of injection molding material according to claim 1, wherein the dimension of the small end cone of the test specimen (1) inserted into the cone-shaped mounting hole is 20-40% of the total length of the test specimen (1).
3. The device for testing the bending strength of the injection molding material according to claim 1, wherein the small end cone section of the test sample (1) is embedded into the conical mounting hole with a size 5-10 times of the diameter of the large end hole of the conical mounting hole.
4. A test method for the bending strength of an injection molding material is characterized by comprising the following steps:
step 1, intercepting an injection molded conical gate as a test sample (1);
step 2, machining a conical mounting hole in the base body (2) according to the size and the taper of the conical section at the small end of the sample (1);
step 3, embedding the small-end conical section of the sample (1) into a conical mounting hole of the base body (2); maintaining the large-end cone section cantilever;
step 4, applying an acting force to the sample (1) at the end part of the large end of the sample (1) through the dynamometer (3) until the sample (1) is broken, and capturing a maximum force value F by the dynamometer (3);
the bending strength of the sample (1) is then:
in the formula:
σ: bending strength, unit: megapascals, MPa;
f: force applied, in units: newton, N; the maximum force value F captured by the dynamometer (3);
l, cantilever length, unit is millimeter, mm;
d: diameter of the big end hole of the conical mounting hole, unit: millimeters, mm;
and L/d is 5-15.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010356264.6A CN111413212A (en) | 2020-04-29 | 2020-04-29 | Device and method for testing bending strength of injection molding material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356264.6A CN111413212A (en) | 2020-04-29 | 2020-04-29 | Device and method for testing bending strength of injection molding material |
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Citations (6)
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|---|---|---|---|---|
| WO2007020724A1 (en) * | 2005-08-16 | 2007-02-22 | Yamanashi University | Portable young's modulus measuring device and breaking strength measuring device |
| CN101936854A (en) * | 2010-08-04 | 2011-01-05 | 中国建筑材料检验认证中心有限公司 | Method for detecting mechanical properties of local heating loading test material under high temperature oxidation environment and device thereof |
| CN103069026A (en) * | 2010-08-31 | 2013-04-24 | 古河电气工业株式会社 | Copper alloy sheet material and process for producing same |
| CN103424293A (en) * | 2013-06-26 | 2013-12-04 | 复旦大学 | Method for measuring bending modulus and yield stress of TSV copper columns |
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| CN209432578U (en) * | 2018-11-15 | 2019-09-24 | 北京科技大学 | A test tool for mechanical properties of CVD diamond material |
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2020
- 2020-04-29 CN CN202010356264.6A patent/CN111413212A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| WO2007020724A1 (en) * | 2005-08-16 | 2007-02-22 | Yamanashi University | Portable young's modulus measuring device and breaking strength measuring device |
| CN101936854A (en) * | 2010-08-04 | 2011-01-05 | 中国建筑材料检验认证中心有限公司 | Method for detecting mechanical properties of local heating loading test material under high temperature oxidation environment and device thereof |
| CN103069026A (en) * | 2010-08-31 | 2013-04-24 | 古河电气工业株式会社 | Copper alloy sheet material and process for producing same |
| CN103424293A (en) * | 2013-06-26 | 2013-12-04 | 复旦大学 | Method for measuring bending modulus and yield stress of TSV copper columns |
| CN106706444A (en) * | 2016-11-30 | 2017-05-24 | 郑州中拓知识产权代理有限公司 | Multi-constraint condition rod piece bending tester |
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Effective date of registration: 20230309 Address after: 102101 No. 3, Yard 10, Kangxiang Road, Kangzhuang Town, Yanqing District, Beijing (Zhongguancun Yanqing Garden) Applicant after: Beijing Samyuan New Materials Co.,Ltd. Address before: 102100 No. 10, Kangxiang Road, Kangzhuang Town, Yanqing District, Beijing Applicant before: BEIJING HUICI POWDER MATERIAL Co.,Ltd. |
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