CN110069825B - Design method of micro-channel aluminum flat tube and blasting pressure calculation method - Google Patents
Design method of micro-channel aluminum flat tube and blasting pressure calculation method Download PDFInfo
- Publication number
- CN110069825B CN110069825B CN201910236006.1A CN201910236006A CN110069825B CN 110069825 B CN110069825 B CN 110069825B CN 201910236006 A CN201910236006 A CN 201910236006A CN 110069825 B CN110069825 B CN 110069825B
- Authority
- CN
- China
- Prior art keywords
- flat tube
- value
- burst pressure
- pressure
- calculated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a design method and a burst pressure calculation method for a microchannel aluminum flat tube, wherein the design method for the microchannel aluminum flat tube is designed according to the burst pressure P of the microchannel aluminum flat tube required by a client, and design parameters are substituted into a formula in the design stage of a drawing of the microchannel aluminum flat tube:
obtaining the calculated value P of the explosion pressure of the designed product 0 (ii) a According to the calculated value P 0 Comparing with the desired value P, if the value P is calculated 0 The deviation from the required value P is large, and the calculated value P is adjusted by adjusting the width W of the flat tube, the thickness D of the middle ribs, the number N of the middle ribs and/or the material of the flat tube 0 . According to the method disclosed by the invention, the blasting pressure value of the product can be calculated in the drawing design stage of the microchannel aluminum flat tube product, and if the calculation result does not meet the requirement, the product drawing is adjusted in time until the calculation result meets the requirement, so that the development cost of a new product is greatly saved.
Description
Technical Field
The invention relates to a design method of a micro-channel aluminum flat tube and a blasting pressure calculation method.
Background
Micro-channel aluminum flat tubes are an emerging industry. In 1981, tuckerman and pepe propose the concept of microchannel heat sinks. Later, microchannels have gradually moved from theory to applications including automotive air conditioning, home air conditioning, and high density electronics cooling. In the automobile air-conditioning industry, the traditional Freon series refrigerant and R134a refrigerant are successively rejected by Montreal protocol and Kyoto protocol as CO 2 As a refrigerant, the refrigerant is a development trend in the air conditioning industry. But CO 2 The refrigeration cycle is supercritical cycle, and higher requirements are provided for the pressure resistance of the micro-channel aluminum flat tube. If the bursting pressure does not meet the requirement, the risk of tube bursting occurs in the using process of the product, so that the whole air conditioner is damaged, and the normal use of the automobile is influenced.
At present, the burst pressure of the micro-channel aluminum flat tube is mainly detected by a burst pressure tester, and the premise of detection is that the micro-channel aluminum flat tube is produced. After the micro-channel aluminum flat tube is produced, the explosion pressure of the product is detected through an explosion pressure testing machine, once the detection result does not meet the requirement of a client, the product is scrapped, and the production cost consumed for producing the product is completely wasted. Will cause huge cost consumption and can not adapt to the development of the air conditioning industry.
On the other hand, in order to ensure that the burst pressure of the flat pipe after being produced can certainly meet the requirements, if the product design is very conservative, the burst pressure of the flat pipe after being produced is detected to be far larger than the required value, which is also a huge waste, because the burst pressure means that the thickness of the middle ribs is increased or the number of the middle ribs is increased, the product weight is increased, and the heat exchange performance of the flat pipe is reduced.
Disclosure of Invention
The invention aims to provide a design method of a micro-channel aluminum flat tube and a blasting pressure calculation method, and solves the technical problems that in the prior art, after the micro-channel aluminum flat tube is produced, the blasting pressure of a product is detected through a blasting pressure testing machine, and once the detection result does not meet the requirements of customers, the product can only be scrapped, the production cost is high, and the operation is complicated.
In order to solve the technical problems, the invention adopts the following technical scheme:
the applicant carries out blasting tests on the microchannel aluminum flat tube, and finds that the direct reason of flat tube blasting is mainly that the middle rib is broken by pulling through analyzing the blasted flat tube. The rib is the main pressure bearing point of the flat pipe and is also the position where the flat pipe has the lowest pressure resistance and is easiest to blast. The thickness of the middle rib is a key parameter influencing the bursting pressure of the flat tube, and the larger the thickness of the middle rib is, the larger the bursting pressure is.
The applicant adopts a burst pressure tester to detect the burst pressure of flat pipes with the same rib thickness and different models, and the detection results are greatly different. The analysis reason is as follows: the middle ribs are main pressure bearing points of the flat pipe, and the flat pipe comprises a plurality of middle ribs, so that the quantity of the middle ribs is also an important parameter influencing the burst pressure of the flat pipe; further analysis shows that the stress area of a single middle rib has more direct influence on the blasting pressure; the larger the stressed area of a single middle rib is, the lower the explosion pressure is. The stress area of the single middle rib can be represented by W/N, W represents the width of the flat pipe, and N represents the number of the middle ribs.
For flat pipes of the same type (the flat pipe width, the middle rib thickness, the middle rib quantity and other dimensions are the same), different raw materials are used, and the bursting pressures are different. The analysis reason is as follows: the material of flat pipe has direct influence, more accurate description to bursting property, and the tensile strength of flat pipe is the key parameter who influences burst pressure promptly, and tensile strength is bigger, and flat pipe burst pressure is bigger.
To sum up, the burst pressure of the flat tube is analyzed
Proportional relation, wherein D represents the thickness of the middle ribs, N represents the quantity of the middle ribs, W represents the width of the flat pipe, and sigma represents the width of the flat pipe b The tensile strength is indicated. Selecting a large number of flat tube sample parts, detecting the thickness, the number, the width and the tensile strength of the middle ribs of the flat tubes, and calculating ^ or ^ based on the measured values>
Value, the actual burst pressure of the flat tube is then detected in order to->
The value is the abscissa and the actual burst pressure is the ordinate, and a scatter diagram is drawn. By analyzing the scatter diagram, the actual burst pressure P and ^ of the flat tube can be known>
Linear relationship, setting the formula:
then, the correction coefficients a and B can be calculated from the scatter diagram.
When a =0.88 and B =0.6, the probability that the burst pressure calculated by the formula (3) is 90% or more is equal to or less than the actually measured value, and the difference is not more than 5MPa. When a =1.04, b = -0.09, the probability that the burst pressure calculated according to the formula is 90% or more is within ± 2MPa of the actually measured value.
A design method of a micro-channel aluminum flat tube comprises the following steps:
1) The burst pressure P of the micro-channel aluminum flat tube required by the client is designed, and in the drawing design stage of the micro-channel aluminum flat tube, design parameters are substituted into a formula:
obtaining the calculated value P of the explosion pressure of the designed product 0 (ii) a P represents the burst pressure in MPa; d represents the thickness of the middle rib, and the unit is mm; n represents the number of middle ribs; w represents the width of the flat tube, and the unit is mm; sigma b Tensile strength in MPa; a and B are correction coefficients which are constants;
2) According to the calculated value P 0 Comparing with the desired value P, if the value P is calculated 0 The deviation from the required value P is larger, the width W of the flat tube, the thickness D of the middle ribs, the number N of the middle ribs and/or the material of the flat tube are adjusted, and then the adjusted parameters are substituted into a formula (1) to obtain the final productAdjusted calculated value P 0 ；
3) And repeating the step 2) until the calculated value P after the last adjustment 0 And meeting the requirement of the burst pressure P, and then producing the microchannel aluminum flat tube product according to the parameters after the last adjustment.
The a =0.88, B =0.6 or a =1.04, B = -0.09.
At the microchannel aluminum flat tube drawing design stage, flat tube width, well muscle thickness, well muscle quantity all are that the designer gives, and tensile strength is more easily estimated, because the tensile strength difference of the flat pipe of the same material different models is very little, for example 1100 grades of flat pipe tensile strength is about 82MPa, 3003 grades of flat pipe tensile strength is about 100 MPa. And in the drawing design stage, calculating the bursting pressure of the flat tube through a formula. If the calculated value is smaller than the required value, the thickness of the middle ribs or the number of the middle ribs can be properly increased (the width of the flat tube is rarely adjusted), and if the size of the flat tube cannot be adjusted due to other factors, raw materials with higher strength can be selected to produce the flat tube.
According to the burst pressure formula in the patent of the invention, in the drawing design stage of the product, the burst pressure value of the product can be calculated according to the corresponding design parameters, and if the value P is calculated 0 If the product drawing does not meet the requirement or is far more than the required value P, the product drawing is adjusted in time until the calculated value P is calculated 0 Satisfactory and not too conservative. The product blasting pressure value is calculated in the product design stage through the blasting pressure formula, so that the development cost of new products can be greatly saved, and power is added for the development of the air-conditioning industry. If the calculated value is far greater than the required value, the thickness of the middle ribs or the number of the middle ribs can be properly reduced, so that the product weight can be reduced, and the requirement of the light weight of an automobile is met.
A method for calculating the bursting pressure of a microchannel aluminum flat tube is characterized by measuring the following parameters of the microchannel aluminum flat tube: the thickness D of the middle rib is in mm; the number N of the middle ribs; the width W of the flat tube is in mm; tensile strength σ of the Material b In units of MPa;and substituting into the formula:
obtaining the burst pressure P for measuring the aluminum flat tube of the micro-channel 2 (ii) a Wherein A and B are correction coefficients and are constants.
The a =0.88, B =0.6, or a =1.04, B = -0.09.
For a microchannel aluminum flat tube object, if the bursting pressure of the microchannel aluminum flat tube object is wanted to be known, and a bursting pressure tester or detection equipment of the same type is not provided, the bursting pressure of the flat tube can be calculated by measuring the width of the flat tube, the thickness of the middle ribs, the quantity of the middle ribs and the tensile strength. Convenient operation, rapidness, low cost and accurate measuring result.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the burst pressure formula in the patent of the invention, in the drawing design stage of the product, the burst pressure value of the product can be calculated according to the corresponding design parameters, and if the calculated value P is calculated 0 If the product drawing does not meet the requirement or is far more than the required value P, the product drawing is adjusted in time until the calculated value P is calculated 0 Compliance is not excessive. The product blasting pressure value is calculated in the product design stage through the blasting pressure formula, so that the development cost of new products can be greatly saved, and power is added for the development of the air-conditioning industry. If the calculated value is far greater than the required value, the thickness of the middle ribs or the number of the middle ribs can be properly reduced, so that the product weight can be reduced, and the requirement of the light weight of an automobile is met.
2) And for the microchannel aluminum flat tube material object, if the bursting pressure of the microchannel aluminum flat tube material object is wanted to be known, and a bursting pressure tester or detection equipment of the same type is not provided, the bursting pressure of the flat tube can be calculated by measuring the width of the flat tube, the thickness of the middle rib, the quantity of the middle ribs and the tensile strength. Convenient operation, rapidness, low cost and accurate measuring result.
Drawings
Fig. 1 is an end view of a microchannel aluminum flat tube.
FIG. 2 is a schematic view of
The value is abscissa, the burst pressure is ordinate, and a scatter diagram is drawn.
Detailed Description
In order to make the purpose and technical solution of the present invention clearer, the following will clearly and completely describe the technical solution of the present invention with reference to the embodiments of the present invention.
The applicant carries out blasting tests on the microchannel aluminum flat tube, and finds that the direct reason of flat tube blasting is mainly that the middle rib is broken by pulling through analyzing the blasted flat tube. The rib is the main pressure bearing point of the flat pipe and is also the position where the flat pipe has the lowest pressure resistance and is easiest to blast. The thickness of the middle rib is a key parameter influencing the bursting pressure of the flat tube, and the larger the thickness of the middle rib is, the larger the bursting pressure is.
The applicant adopts a burst pressure tester to detect the burst pressure of flat pipes with the same rib thickness and different models, and the detection results are greatly different. The analysis reason is as follows: the middle ribs are main pressure bearing points of the flat pipe, and the flat pipe comprises a plurality of middle ribs, so that the quantity of the middle ribs is also an important parameter influencing the burst pressure of the flat pipe; further analysis shows that the stress area of a single middle rib has more direct influence on the blasting pressure; the larger the stressed area of a single middle rib is, the lower the explosion pressure is. The stress area of the single middle rib can be represented by W/N, W represents the width of the flat pipe, and N represents the number of the middle ribs.
For flat pipes of the same type (the flat pipe width, the middle rib thickness, the middle rib quantity and other dimensions are the same), different raw materials are used, and the bursting pressures are different. The analysis reason is as follows: the material of flat pipe has direct influence, more accurate description to bursting property, and the tensile strength of flat pipe is the key parameter who influences burst pressure promptly, and tensile strength is bigger, and flat pipe burst pressure is bigger.
To sum up, the burst pressure of the flat tube is analyzed
Proportional relation, wherein D represents the thickness of the middle ribs, N represents the quantity of the middle ribs, W represents the width of the flat pipe, and sigma represents the width of the flat pipe b The tensile strength is indicated. Selecting a large number of flat tube sample parts, detecting the thickness, the number, the width and the tensile strength of the middle ribs of the flat tubes, and calculating ^ or ^ based on the measured values>
Value, the actual burst pressure of the flat tube is then detected in order to->
The values are plotted on the abscissa and the actual burst pressure on the ordinate, and a scatter plot is drawn, as shown in fig. 2. By analyzing the scatter diagram, the actual burst pressure P and ^ of the flat tube can be known>
Linear relationship, setting the formula:
then, the correction coefficients a and B can be calculated from the scatter diagram. When a =0.88 and B =0.6, the probability that the burst pressure calculated by the formula (4) is 90% or more is equal to or less than the actually measured value, and the difference is not more than 5MPa. When a =1.04, b = -0.09, the probability that the burst pressure calculated according to the formula is 90% or more is within ± 2MPa of the actually measured value.
The first embodiment is as follows:
the applicant is an enterprise for producing the microchannel aluminum flat tube. According to the requirements of customers, a new type of micro-channel aluminum flat tube is developed, as shown in fig. 1, the external dimension of a product required by the customer is 16 x 1.3 (the width W of the flat tube is 16mm, the thickness of the flat tube is 1.3 mm), and the required value P of the burst pressure is more than or equal to 25MPa. In the initial design, the thickness D of the middle ribs is 0.3mm, the number N of the middle ribs is 15, and the flat tube material is 1100 (the tensile strength is sigma) b In 82 MPa);
introduction of the above parameters
Calculating A =0.88 and B =0.6 to obtain a calculated burst pressure value P 0 20.895MPa, less than the customer requirement value P; the thickness D of the middle rib is changed from 0.3 to 0.4mm. After the flat tube is produced, the rib thickness in the actual detection is 0.391mm (which meets the tolerance of 0.4 +/-0.05), and the rib thickness is brought to pass the judgment of the whether or not the flat tube is produced again>
Calculating the burst pressure P 0 And the pressure is not less than 27.05MPa, and meets the requirement of a client.
And (3) producing a microchannel aluminum flat tube product according to the modified parameters, and then carrying out a bursting pressure test, wherein the bursting pressure value measured by the test is 27.14MPa, and the difference between the bursting pressure value measured by the test and the calculated value 27.05MPa is 0.09MPa.
Before the formula is deduced, only a rough estimation can be carried out on the burst pressure in the drawing design stage, errors are generated with high probability, the burst pressure is detected to be insufficient after the flat tube is produced, the product is not accepted by a customer, and the production cost is consumed.
Example two:
the width W of a micro-channel flat aluminum tube of a certain model produced by the applicant company is 25mm, the thickness D of a middle rib is 0.3mm, the number N of the middle ribs is 20, and the flat tube is 3003 (tensile strength sigma-shaped) b In 100 MPa). The flat tube bursting pressure P required by a client is more than or equal to 13MPa, and the flat tube bursting pressure can meet the client requirement. In order to better meet the requirements of the market on the light weight of the automobile, customers propose to reduce the weight of the product.
The company design department reduces the number N of the middle ribs from 20 to 15 according to formula calculation. After the flat tube is produced, actually measuring the thickness D =0.281mm of the middle rib (according with the tolerance of 0.3 +/-0.05), and calculating the bursting pressure P by a formula 0 =15.44MPa. A =0.88 and B =0.6 are taken, and a burst pressure value 16.27MPa is actually measured by a burst pressure tester with a difference of 0.83MPa.
Under the prerequisite that burst pressure satisfies the requirement, well muscle quantity reduces to 15 by 20, and flat tub of weight reduces by a wide margin, and well muscle quantity reduction means the increase of refrigerant flow area moreover, and flat tub of heat transfer performance has had obvious promotion. If the burst pressure calculation formula is not available, the product weight is reduced for the time, and then a certain curved path is taken.
The embodiments of the present invention are not limited to the specific embodiments described herein, but rather, the embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, the present invention should be construed as limited only by the appended claims.
Claims (4)
1. A design method of a micro-channel aluminum flat tube is characterized by comprising the following steps:
1) The burst pressure P of the micro-channel aluminum flat tube required by a client is designed, and in the drawing design stage of the micro-channel aluminum flat tube, design parameters are substituted into a formula:
obtaining the calculated value P of the explosion pressure of the designed product 0 ；
Wherein P represents the required burst pressure in MPa; d represents the thickness of the middle rib, and the unit is mm; n represents the number of middle ribs; w represents the width of the flat tube, and the unit is mm; σ b represents tensile strength in MPa; a and B are correction coefficients and are constants;
2) According to the calculated value P 0 Comparing with the desired value P, if the value P is calculated 0 The deviation from the required value P is large, the width W of the flat pipe, the thickness D of the middle ribs, the number N of the middle ribs and/or the material of the flat pipe are adjusted, and then the adjusted parameters are substituted into a formula (1) to obtain an adjusted calculated value P 0 ；
3) Repeating the step 2) until the calculated value P after the last adjustment 0 Meeting the requirement of the burst pressure P, and then producing a microchannel aluminum flat tube product according to the parameters after the last adjustment;
the correction coefficients a and B are obtained as follows:
selecting a large number of flat tube sample parts, detecting the thickness of the middle ribs, the number of the middle ribs, the width of the flat tubes and the tensile strength of the flat tubes, and calculating
Value, the actual burst pressure of the flat tube is then detected in order to->
The value is the abscissa and the actual burst pressure is the ordinate, a scatter diagram is drawn, and then, the correction coefficients a and B are calculated from the scatter diagram.
2. The method for designing a microchannel aluminum flat tube according to claim 1, wherein a =0.88, B =0.6, or a =1.04, B = -0.09.
3. The method for calculating the bursting pressure of the microchannel aluminum flat tube is characterized by measuring the following parameters of a microchannel aluminum flat tube product: the thickness D of the middle rib is in mm; the number N of the middle ribs; the width W of the flat tube is in mm; the tensile strength sigma b of the material is MPa; and substituting into the formula:
obtaining the burst pressure P for measuring the aluminum flat tube of the micro-channel 2 (ii) a Wherein A and B are correction coefficients and are constants;
the correction coefficients a and B are obtained as follows:
selecting a large number of flat tube sample parts, detecting the thickness of the middle ribs, the number of the middle ribs, the width of the flat tubes and the tensile strength of the flat tubes, and calculating
The value is then detected and the actual burst pressure of the flat tube is detected in order to->
The value is the abscissa, the actual burst pressure is the ordinate, a scatter diagram is drawn, and then, the correction coefficients a and B are calculated from the scatter diagram.
4. The method for calculating the burst pressure of the microchannel aluminum flat tube, according to claim 3, wherein A =0.88, B =0.6 or A =1.04, B = -0.09.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910236006.1A CN110069825B (en) | 2019-03-26 | 2019-03-26 | Design method of micro-channel aluminum flat tube and blasting pressure calculation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910236006.1A CN110069825B (en) | 2019-03-26 | 2019-03-26 | Design method of micro-channel aluminum flat tube and blasting pressure calculation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110069825A CN110069825A (en) | 2019-07-30 |
| CN110069825B true CN110069825B (en) | 2023-04-07 |
Family
ID=67366669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910236006.1A Active CN110069825B (en) | 2019-03-26 | 2019-03-26 | Design method of micro-channel aluminum flat tube and blasting pressure calculation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110069825B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101308071A (en) * | 2008-04-03 | 2008-11-19 | 上海市塑料研究所 | Hose steel wire enhancement calibration method |
| CN202329346U (en) * | 2011-09-28 | 2012-07-11 | 金龙精密铜管集团股份有限公司 | Heat exchanger for inner grooved copper tube and air conditioner |
| CN203432431U (en) * | 2013-05-17 | 2014-02-12 | 无锡凯博易机电科技有限公司 | Pressure sealing devices and anti-pressure capability detecting tester and system used for porous flat tube for air condition heat exchanger |
| CN105258545A (en) * | 2014-07-19 | 2016-01-20 | 无锡华瑞铝业有限公司 | Hollow flat tube |
| CN108284139A (en) * | 2018-01-11 | 2018-07-17 | 扬州瑞斯乐复合金属材料有限公司 | A kind of extrusion die of ellipse micro-channel flat |
-
2019
- 2019-03-26 CN CN201910236006.1A patent/CN110069825B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101308071A (en) * | 2008-04-03 | 2008-11-19 | 上海市塑料研究所 | Hose steel wire enhancement calibration method |
| CN202329346U (en) * | 2011-09-28 | 2012-07-11 | 金龙精密铜管集团股份有限公司 | Heat exchanger for inner grooved copper tube and air conditioner |
| CN203432431U (en) * | 2013-05-17 | 2014-02-12 | 无锡凯博易机电科技有限公司 | Pressure sealing devices and anti-pressure capability detecting tester and system used for porous flat tube for air condition heat exchanger |
| CN105258545A (en) * | 2014-07-19 | 2016-01-20 | 无锡华瑞铝业有限公司 | Hollow flat tube |
| CN108284139A (en) * | 2018-01-11 | 2018-07-17 | 扬州瑞斯乐复合金属材料有限公司 | A kind of extrusion die of ellipse micro-channel flat |
Non-Patent Citations (6)
| Title |
|---|
| Method for predicting and optimizing the strength of extruded multi-void aluminum heat exchanger Tube;Frank F.Kraft;《SAE Transactions》;20021231;第11卷;96-106 * |
| 基于有限元法的压力容器***压力预测;王飞等;《化工装备技术》;20160810;第37卷(第04期);42-44 * |
| 扁平绕带式压力容器轴向***压力分析;田锦邦等;《化工机械》;20050425(第02期);96-99 * |
| 折叠微通道铝扁管极限承压有限元仿真;周宁等;《塑性工程学报》;20170301;第24卷(第01期);152-159 * |
| 汽车空调全铝微通道换热器结构研究;薛震等;《日用电器》;20180725(第07期);106-109 * |
| 铜管***压力计算公式;杨帆等;《武汉工程职业技术学院学报》;20170915;第29卷(第03期);12-16 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110069825A (en) | 2019-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | Numerical simulation and metal flow analysis of hot extrusion process for a complex hollow aluminum profile | |
| Ahmadi Brooghani et al. | Loading path optimization of a hydroformed part using multilevel response surface method | |
| CN109766517A (en) | A kind of energy consumption benchmark modification method for substation energy efficiency assessment | |
| CN101133312A (en) | Steel pipe partial buckling performance evaluation method, steel pipe design method, steel pipe manufacturing method and steel pipe | |
| CN111950098A (en) | Metal sheet punching process parameter optimization method based on finite element simulation | |
| CN110069825B (en) | Design method of micro-channel aluminum flat tube and blasting pressure calculation method | |
| CN117367688B (en) | Method for detecting and analyzing air tightness of glass fiber reinforced plastic pipe | |
| CN106126883B (en) | Tubing and casing quality level evaluation method | |
| Liu et al. | “Size effect” related hydroforming characteristics of thin-walled 316-L bellow considering pressure change | |
| Kim et al. | Experimental determination of the failure surface for DP980 high-strength metal sheets considering stress triaxiality and Lode angle | |
| Zardoshtian et al. | Improvement of the rotary draw bending process in rectangular tubes by using internal fluid pressure | |
| Lăzărescu | Effect of internal fluid pressure on quality of aluminum alloy tube in rotary draw bending | |
| Kuwabara et al. | Hole expansion simulation considering the differential hardening of a sheet metal | |
| CN112347414A (en) | Single-defect bent pipe limit internal pressure calculation method | |
| Huang et al. | Optimal design for the fluid cavity shape in hydromechanical fine blanking | |
| CN112115572A (en) | Safety evaluation method for pipeline dent defect | |
| Mottonen et al. | Manufacturing process capability and specification limits | |
| Karabegović et al. | Experimental modeling of fluid pressure during hydroforming of welded plates | |
| CN103984845B (en) | Method and system for calculating gas pipeline completeness evaluation period | |
| CN105631232A (en) | High-precision gas medium regulating valve selection calculation method | |
| Tang et al. | Numerical and experimental study on expansion forming of inner grooved tube | |
| Elsayed et al. | An investigation and prediction of springback of sheet metals under cold forming condition | |
| Kappes et al. | Evaluation of pneumatic bulge test experiments and corresponding numerical forming simulations | |
| CN112833597A (en) | Exhaust side parameter-based refrigerant quantity detection control method for multi-split air conditioning system | |
| CN106197887B (en) | A kind of determination method of sealed electrical connector low temperature leak criterion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |