CN113076703A - Hot stamping die water channel flow velocity analysis method based on database - Google Patents
Hot stamping die water channel flow velocity analysis method based on database Download PDFInfo
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Abstract
The invention relates to the technical field of hot stamping, in particular to a database-based method for analyzing the flow rate of a hot stamping die water channel. A hot stamping die water channel flow velocity analysis method based on a database is characterized in that: the specific method comprises the following steps: s1, establishing a water resistance coefficient database; s2, analyzing the characteristics of the water channel joint; s3, establishing a water channel theoretical equation; s4, calculating the flow rate of the water channel; s5, displaying the flow rate of the water channel; and S6, water channel flow speed and flow requirement under different pressures. Compared with the prior art, the method for analyzing the flow rate of the water channel of the hot stamping die based on the database is provided, the theoretical equation of the cooling system is quickly established, the flow rate of the water channel is solved by adopting the theoretical analysis method, a large amount of analysis time can be saved, and the method plays an important role in the early-stage design optimization of the water channel.
Description
Technical Field
The invention relates to the technical field of hot stamping, in particular to a database-based method for analyzing the flow rate of a hot stamping die water channel.
Background
Automobile hot stamping parts generally adopt automatic production line to promote production efficiency, and every stroke frequency includes processes such as feeding, punching press, pressurize cooling, gets the piece, and wherein the pressurize cooling is a quenching process, takes away the heat on sheet material, the mould through the cooling water on the mould. The pressure maintaining and cooling time has decisive effect on the efficiency of the hot stamping part and the material quality after forming. The cooling water channel on the mold is complex, and the flow speed on the cooling water channel has important influence on the uniform cooling and the cooling time of the part.
Due to the complexity of the cooling water channels, the flow velocity on each cooling water channel is difficult to be uniformly distributed, and the theoretical calculation is difficult in the design. Finite element analysis is often used to analyze the flow rate. The method has long pretreatment time and long calculation time, and influences the optimal design of the cooling water channel.
Disclosure of Invention
The invention provides a hot stamping die water channel flow velocity analysis method based on a database, aiming at overcoming the defects of the prior art, quickly establishing a theoretical equation of a cooling system, solving the water channel flow velocity by adopting a theoretical analysis method, saving a large amount of analysis time and playing an important role in the early-stage design optimization of a water channel.
In order to achieve the purpose, the method for analyzing the flow rate of the hot stamping die water channel based on the database is designed, and is characterized in that: the specific method comprises the following steps:
s1, establishing a water resistance coefficient database: respectively establishing parameterized simulation models according to the geometric characteristics of water channel connection, and calculating water resistance coefficients in different connection forms by a simulation method;
s2, analyzing characteristics of the water channel joint: analyzing the type and parameters of each water channel joint according to the geometric characteristics of the water channel;
s3, establishing a water channel theoretical equation: establishing a theoretical equation of the whole water channel system according to the type and the parameters of the water channel joint analyzed in the step S2;
s4, calculation of water channel flow rate: according to the equation in the step S3, the pressure and the flow of each branch water channel under a certain pressure can be obtained by adopting the solution of a general linear equation;
s5, display of channel flow rate: according to the equation in the step S3, the flow rate of each water pipe is obtained and is distinguished by different colors;
s6, water channel flow speed and flow requirement under different pressures: the flow speed requirement on the profile water pipe can be solved by calculating the flow speed and the flow of the water pipe under a plurality of pressures for a plurality of times, and the working pressure and the flow required on the whole water channel can be solved.
In step S1, the geometric features of the waterway connection include a lower straight pipe, an elbow pipe, and a reducer pipe.
In step S2, the parameters of the waterway connector include a length of the waterway, a diameter of the waterway, an angle of the elbow, and a diameter of the elbow.
In step S3, the theoretical equation of the water channel system is
Wherein p isf(q) is the pressure available in the system, the required flow rate q; f. ofz(q) is the relationship between the water resistance characteristic of the straight pipe and the pressure and flow of the circular pipe in unit length; liThe length of each section of linear water pipe is m sections; f. ofi(q) is the pressure and flow rate relationship at each linker site, and n linkers are in total.
Compared with the prior art, the invention provides the hot stamping die water channel flow velocity analysis method based on the database, the theoretical equation of the cooling system is quickly established, the theoretical analysis method is adopted to solve the water channel flow velocity, a large amount of analysis time can be saved, and the method plays an important role in the early-stage design optimization of the water channel.
Drawings
FIG. 1 is a logic flow diagram of the present invention.
Fig. 2 is a schematic diagram of an embodiment.
Detailed Description
The invention is further illustrated below with reference to the accompanying drawings.
As shown in fig. 1, a method for analyzing the flow rate of a water channel of a hot stamping die based on a database includes the following steps:
s1, establishing a water resistance coefficient database: according to the geometric characteristics of the water channel connection, parametric simulation models are respectively established, and water resistance coefficients under different connection forms are calculated through a simulation method.
As shown in table 1, is a part of the data of the water resistance coefficient database.
TABLE 1
Table 1 shows the relationship between the water resistance pressure and the flow rate in different combinations.
S2, analyzing characteristics of the water channel joint: analyzing the type and parameters of each water channel joint according to the geometric characteristics of the water channel;
s3, establishing a water channel theoretical equation: establishing a theoretical equation of the whole water channel system according to the type and the parameters of the water channel joint analyzed in the step S2; with reference to the basic criteria: the flow rates are equal when the water pipes are connected in series; the pressure difference is equal on the parallel water channels;
s4, calculation of water channel flow rate: according to the equation in the step S3, the pressure and the flow of each branch water channel under a certain pressure can be obtained by adopting the solution of a general linear equation;
s5, display of channel flow rate: according to the equation in the step S3, the flow rate of each water pipe is obtained and is distinguished by different colors;
s6, water channel flow speed and flow requirement under different pressures: the flow speed requirement on the profile water pipe can be solved by calculating the flow speed and the flow of the water pipe under a plurality of pressures for a plurality of times, and the working pressure and the flow required on the whole water channel can be solved.
The problem of uneven flow velocity is found, and the treatment can be carried out in time. The problem of too large a flow rate is found, and the water pipe needs to be redesigned to reduce the flow rate. Because the system traffic is limited.
In step S1, the water channel connection geometry includes a lower straight pipe, an elbow pipe, and a reducer pipe.
In step S2, the parameters of the water channel joint include the length of the water channel, the diameter of the water channel, the angle of the elbow, and the diameter of the elbow.
In step S3, the theoretical equation for the waterway system is
Wherein p isf(q) is the pressure available in the system, the required flow rate q; f. ofz(q) is the relationship between the water resistance characteristic of the straight pipe and the pressure and flow of the circular pipe in unit length; liThe length of each section of linear water pipe is m sections; f. ofi(q) is the pressure and flow rate relationship at each linker site, and n linkers are in total.
Example (b):
the key point of the invention is to establish a water resistance system database, which comprises the flow characteristics of various pipelines and joints under different pressures.
The method of the invention is illustrated by an analysis of the flow rate of the water supply to a small piece, as shown in figure 2. For complex parts, the same idea is adopted, a more complex model is established, and the flow velocity on each water channel is solved.
In fig. 2, there are 4 straight water pipes, and the pressure and flow rate have the relationship according to the total straight length lz and the unit length: p is a radical ofz＝fz(q)*lz. The data are shown in table 2.
TABLE 2
| Connection angle | Inlet pressure (MPa) | Flow rate (m)3/h) |
| 10° | 0.01 | 0.370 |
| 15° | 0.01 | 0.372 |
| 20° | 0.01 | 0.375 |
| 25° | 0.01 | 0.376 |
| 85° | 0.01 | 0.452 |
| 90° | 0.01 | 0.469 |
For the single-pass water pipe in fig. 2, the summation of the water resistance pressures in the series is equal to the pressure in the branch. There is the following relationship: p is a radical off(q)＝fz(q)*lz+f1(q)+f2(q)+f3(q) is carried out. Wherein the water resistance of the straight pipe is fz(q) and Water resistance characteristics f of bent pipe1(q)、f2(q)f3And (q) values can be obtained by directly fitting the data of the water resistance database.
The equation adopts linear step length, and the flow and the pressure of the water path under a certain pressure can be quickly determined.
Claims (4)
1. A hot stamping die water channel flow velocity analysis method based on a database is characterized in that: the specific method comprises the following steps:
s1, establishing a water resistance coefficient database: respectively establishing parameterized simulation models according to the geometric characteristics of water channel connection, and calculating water resistance coefficients in different connection forms by a simulation method;
s2, analyzing characteristics of the water channel joint: analyzing the type and parameters of each water channel joint according to the geometric characteristics of the water channel;
s3, establishing a water channel theoretical equation: establishing a theoretical equation of the whole water channel system according to the type and the parameters of the water channel joint analyzed in the step S2;
s4, calculation of water channel flow rate: according to the equation in the step S3, the pressure and the flow of each branch water channel under a certain pressure can be obtained by adopting the solution of a general linear equation;
s5, display of channel flow rate: according to the equation in the step S3, the flow rate of each water pipe is obtained and is distinguished by different colors;
s6, water channel flow speed and flow requirement under different pressures: the flow speed requirement on the profile water pipe can be solved by calculating the flow speed and the flow of the water pipe under a plurality of pressures for a plurality of times, and the working pressure and the flow required on the whole water channel can be solved.
2. The database-based method for analyzing the flow rate of the water channel of the hot stamping die according to claim 1, wherein the method comprises the following steps: in step S1, the geometric features of the waterway connection include a lower straight pipe, an elbow pipe, and a reducer pipe.
3. The database-based method for analyzing the flow rate of the water channel of the hot stamping die according to claim 1, wherein the method comprises the following steps: in step S2, the parameters of the waterway connector include a length of the waterway, a diameter of the waterway, an angle of the elbow, and a diameter of the elbow.
4. The database-based method for analyzing the flow rate of the water channel of the hot stamping die according to claim 1, wherein the method comprises the following steps: in step S3, the theoretical equation of the water channel system is
Wherein, in the step (A),
is the pressure that the system can provide, and requires the flow rate q;
the relationship between the water resistance characteristic of a straight pipe and the pressure and flow of a circular pipe with unit length is disclosed;
is the length of each section of linear water pipe, in total
A segment;
is the pressure and flow relation of each joint part, and has
And (4) a joint.
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Citations (5)
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|---|---|---|---|---|
| JPH02120643A (en) * | 1988-10-31 | 1990-05-08 | Hitachi Ltd | Method for predicting pressure loss in a mold and method for designing a mold flow path using the same |
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| CN109047522A (en) * | 2018-08-22 | 2018-12-21 | 上海博汇模具有限公司 | A kind of calculation method of hot-forming die type surface current speed uniformity |
| CN111159873A (en) * | 2019-12-25 | 2020-05-15 | 浙江博汇汽车部件有限公司 | Method for calculating working flow of each cavity of thermal forming die |
| US10684078B1 (en) * | 2019-05-24 | 2020-06-16 | Macrae Technologies, Inc. | Method for stabilizing thermal conduction of block coolers with cast-in coolant pipes |
-
2021
- 2021-03-02 CN CN202110227577.6A patent/CN113076703B/en active Active
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|---|---|---|---|---|
| JPH02120643A (en) * | 1988-10-31 | 1990-05-08 | Hitachi Ltd | Method for predicting pressure loss in a mold and method for designing a mold flow path using the same |
| WO2011028818A2 (en) * | 2009-09-01 | 2011-03-10 | Trustees Of Boston University | High throughput multichannel reader and uses thereof |
| CN109047522A (en) * | 2018-08-22 | 2018-12-21 | 上海博汇模具有限公司 | A kind of calculation method of hot-forming die type surface current speed uniformity |
| US10684078B1 (en) * | 2019-05-24 | 2020-06-16 | Macrae Technologies, Inc. | Method for stabilizing thermal conduction of block coolers with cast-in coolant pipes |
| CN111159873A (en) * | 2019-12-25 | 2020-05-15 | 浙江博汇汽车部件有限公司 | Method for calculating working flow of each cavity of thermal forming die |
Non-Patent Citations (4)
| Title |
|---|
| LIM W S 等: "Cooling channel design of hot stamping tools for uniform high-strength components in hot stamping process", 《THE INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY》 * |
| 万雨娴: "高强度钢热成型模具冷却水道的设计及传热效果研究", 《中国优秀硕士学位论文全文数据库 (工程科技Ⅰ辑)》 * |
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