KR101867728B1 - Mold design method - Google Patents

Abstract

Provided is a mold design method. The mold design method includes a molding analysis and a mold analysis. The molding analysis acquires material conditions of a molding material and designs a shape of a blank and a mold surface. The mold analysis calculates the amount of wear of each part of a mold using the molding analysis. The amount of wear of each part of the mold is used to reflect change in a shape of the mold, and the mold material or surface treatment specification of the part where the degree of wear is large is changed.

Description

Mold design method {

The present invention relates to a mold design method, and more particularly, to a method of designing a mold in consideration of a mold wear prediction technique.

In order to reduce fuel consumption, the weight reduction of automobiles is being continuously pursued. At the same time, in order to secure the safety of passengers in automobiles, the strength of materials applied to automobile parts is increasing. As the strength of the material increases, difficulty in molding the material is increasing. For example, as the strength of the material gradually increases, the damage and wear problems of the mold for progressing the molding are increasing.

If the mold is damaged during product production and the production process is interrupted, additional costs will be incurred due to the inability to produce the product within the specified time, and additional time and expense may be incurred to compensate and regenerate the damaged part of the mold have.

In addition, if a mold is manufactured by using a material having high abrasion resistance on the entire mold in order to reduce or prevent the damage and wear of the mold, the manufacturing cost of the mold increases, and inconsistency arises in that the whole must be replaced / maintained from the viewpoint of maintenance . Also, when selecting such a high specification, the unit price of the product produced by using the mold is also increased, resulting in a burden on the user for the cost.

A problem to be solved by the technical idea of the present invention is to provide a mold designing method for predicting an area where a wear phenomenon is likely to occur in a molding operation and using the same to select a specification.

A mold designing method according to an embodiment of the present invention is provided. This mold design method includes molding analysis and mold analysis. The above-described molding analysis includes securing the physical property of the molding material and designing the shape of the blank and the mold surface. The mold analysis involves calculating the amount of wear of each part of the mold using the molding analysis. The mold specifications of some of the parts of the mold are changed based on the calculated amount of wear of each part of the mold.

In some embodiments, the mold analysis is performed by forming the mold using the blank formation and the mold surface design of the molding analysis, securing the wear factor of the mold and physical properties of the mold material, Calculating a star wear amount, and comparing the calculated wear amount of each part of the mold with the critical wear amount. In the normal parts manufacturing process, the continuous use ability of the mold closely affects the production quantity of the manufactured parts, so it should be fully considered in the mold designing and specification selection stages. Therefore, the number of attempts is proportional to the number of times the mold is used, and it is compared with the critical wear amount to secure the quality of the manufactured parts, and a suitable mold The specification needs to be selected.

The calculation of the wear amount of each part of the mold is calculated by the following equation,

Where W _depth represents the wear depth, k represents the wear coefficient, H represents the hardness of the mold material or surface treatment specification, P represents the contact pressure between the mold and the blank, The relative speed between the mold and the blank can be indicated.

Wherein changing the material or the surface treatment specification of a part of the metal mold having a large amount of wear is to compare the calculated wear amount of each part of the metal mold with the critical wear amount so that the wear amount of each part of the metal mold is excessive And determining the portion where wear is concentrated, and changing the mold specification. On the contrary, in the case where the abrasion is hardly predicted, it is possible to reduce the mold manufacturing cost by downsizing the specification.

A mold designing method according to an embodiment of the present invention is provided. The mold designing method includes: performing a molding analysis on a molding material; calculating a wear amount of each part of the mold by performing a mold analysis on the mold using the molding analysis; The material of the part is changed or the surface treatment specification is applied and the material of the part is changed by using the molding analysis or the mold analysis is performed on the mold to which the surface treatment specification is applied, Calculating a wear amount and determining a mold specification when the calculated wear amount of each part of the mold is smaller than the critical wear amount.

A mold designing method according to an embodiment of the present invention is provided. The mold designing method includes performing a molding analysis on a molding material, predicting a wear amount of each portion of the mold using the molding analysis, and changing a specification of a portion having a large wear amount among the respective portions of the mold.

In some embodiments, the forming analysis includes securing the properties of the blank and designing the shape of the blank and the mold surface, and predicting the amount of wear of each portion of the mold is performed by the blank forming and mold Forming the mold using the surface design, securing the wear coefficient of the mold, the physical properties of the mold material, and calculating the wear amount of each portion of the mold.

The calculation of the wear amount of each part of the mold is calculated by the following equation,

_Wherein W _depth represents a wear depth, k represents a wear coefficient, H represents a hardness of the mold, P represents a contact pressure between the mold and the blank, and v represents a contact pressure between the mold and the blank Can be represented by the relative speed of

Changing the specification of the portion having a large amount of wear among the respective portions of the mold may include advancing a surface treatment for enhancing the abrasion resistance of the base mold material to the base mold material of the mold.

According to embodiments of the technical idea of the present invention, there is provided a mold designing method for predicting an area having a high possibility of occurrence of abrasion phenomenon at the time of molding operation and using the same to select a specification.

1 is a flow chart for explaining a mold designing method according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a mold material usable in a mold according to an embodiment of the present invention.
3A is a graph showing the wear coefficient of the mold material of FIG.
3B is a graph showing the hardness of the mold material of FIG.
4 is a perspective view schematically showing a vehicle body structure of an automobile.
Fig. 5 is a plan view schematically showing a blank for forming one of the parts of the automobile body structure of Fig. 4; Fig.
Fig. 6 is a plan view schematically showing a mold surface for forming one of the parts of the automobile body structure of Fig. 4; Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising "does not exclude the presence or addition of the stated components, steps, operations, one or more other components, and / or devices.

Like reference numerals refer to like elements throughout the specification. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. The device can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

In the drawings, the size and thickness of components are exaggerated for an effective description of the technical content. Thus, the shape of the illustrations can be modified by production techniques, device configurations, and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown. The regions illustrated in the figures have schematic properties, and the shapes of the regions illustrated in the drawings are intended to illustrate particular types of mechanical devices or steels and are not intended to limit the scope of the invention.

Like reference numerals refer to like elements throughout the specification. Accordingly, although the same reference numerals or similar reference numerals are not mentioned or described in the drawings, they may be described with reference to other drawings. Further, even if the reference numerals are not shown, they can be described with reference to other drawings.

FIG. 1 is a flow chart for explaining a mold designing method according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a mold material usable for a mold, FIG. 3 is a graph showing the hardness of the mold material of FIG. 2, FIG. 4 is a perspective view schematically showing a vehicle body structure of an automobile, FIG. 5 is a graph showing one of the parts of the vehicle body structure of FIG. Fig. 6 is a plan view schematically showing a mold surface for forming one of the parts of the automobile body structure of Fig. 4; Fig.

Referring to FIG. 1, a method of designing a mold according to an embodiment of the present invention will be described, and contents necessary for a mold designing method will be described with reference to FIGS. 2 to 6, respectively.

First, a mold design method according to an embodiment of the present invention will be described with reference to FIG.

Referring to FIG. 1, a mold designing method according to an embodiment of the present invention includes a molding analysis 100, a wear analysis 200 of a mold using the molding analysis 100, The number of times the mold is repeatedly operated determines the final mold specification 260 in conjunction with the number of times the mold is used, that is, the number of parts manufactured, Lt; / RTI >

The molding analysis 100 may include securing the material properties of the forming material 110 and designing the blank shape and mold surface 120.

Securing (110) the physical property of the molding material may include grasping the physical properties of the material of the part to be made. The material property of the molding material may be determined according to the characteristics of the part finally required. For example, a component such as a B-pillar of an automobile may be required to be formed of a molding material having ultrahigh strength properties.

The blank shape and the mold surface design 120 can be determined according to the shape of a part desired by the customer. For example, in the case of manufacturing an automobile part such as the B pillar 310 of the automobile body structure 300 as shown in FIG. 4, the shape of the blank and the mold surface are designed according to the shape of the required automobile parts . For example, as shown in FIG. 5, the shape of the blank 350 necessary for manufacturing an automobile part may be determined, and the mold surface 400 of the mold may be designed as shown in FIG. The blank shape 350 of FIG. 5 and the mold surface 400 of FIG. 6 are illustrative and can be modified according to various types of parts desired by the customer. The forming process according to the forming analysis 100 can be predicted through finite element analysis. This finite element analysis is the engineering analysis using the numerical analysis method theory called Finite Element Method (FEM).

The wear analysis 200 and the mold shape change 250 will be described with reference to FIG.

The wear analysis 200 may include forming the preliminary mold 210 using the blank shape and the mold surface design 120. Here, forming the preliminary mold 210 may mean forming a mold shape using a computer system. Therefore, the preliminary mold 210 can be formed by a computer program.

The abrasion analysis (200) of the mold may include securing (220) the mold wear coefficient and the mold material properties. The mold abrasion coefficient and the material properties of the mold will be described with reference to Figs. 2, 3A and 3B. FIG. 2 is a cross-sectional view showing a mold material 10 according to an embodiment of the present invention. FIG. 3A is a graph showing a wear coefficient K according to depth from the surface S of the mold material 10 in FIG. And FIG. 3B is a graph showing the hardness (H) along the depth from the surface S of the mold material 10 in FIG.

Referring to FIGS. 2, 3A and 3B, an example of the mold material 10 according to an embodiment of the present invention includes a first material layer 10A, a second material layer 10B, 10C). The first material layer 10A may be a surface material layer of the mold material 10. [ The second material layer 10B may be located under the first material layer 10B and the third material layer 10C may be disposed under the second material layer 10B.

The first material layer 10A of the mold material 10 may have a lower wear coefficient K but a higher hardness H than the second and third material layers 10B and 10C. The second material layer 10B of the mold material 10 may have a lower abrasion coefficient K but a higher hardness H than the third material layer 10C. The physical properties of the mold material 10 are shown by way of example and may vary depending on the embodiment.

Again, referring to FIG. 1, the wear analysis 200 of the mold may include calculating 230 the wear amount of each part of the mold, and comparing 240 the thus calculated wear amount to the critical wear amount 240 . The critical wear amount may be determined in consideration of the assembly tolerance of the parts in the component assembly process for manufacturing the final product.

(230) of the wear amount of each part of the mold can be calculated by the following equation (1).

Here, "W _depth " represents the wear depth of the mold, "K" and "H" represent the abrasion coefficient K and the hardness H described in FIGS. 3A and 3B, , "V" represents the relative velocity between the mold and the blank, and "t" represents the time.

The wear amount of each part of the mold can be predicted by calculating the amount of wear of each part of the mold using Equation (1).

In the mold designing method according to an embodiment of the present invention, the mold shape change 250 is a result of reflecting the calculated amount of wear. For example, after calculating the amount of wear of each part of the mold, the calculated amount of wear is removed from the previous mold shape. Therefore, the portion of the preliminary mold 210, which has an increased amount of wear compared to the critical wear amount, is less likely to damage the mold, which can be taken into account when selecting the mold specification. On the other hand, if the amount of wear is large based on the calculation of the wear amount and the critical wear amount is exceeded early under the condition that the number of times of use of the mold, that is, the number of parts manufacturing is small, the mold material and the surface treatment specification are changed, Verification and selection of specifications.

After proceeding to the mold shape alteration 250, the wear analysis 200 may be performed again. The wear analysis 200 is performed again by forming the preliminary mold 210 whose shape is partially changed due to the mold shape change 250 and ensuring the mold wear coefficient and the mold material property of the preliminary mold 210 (220), calculating the amount of wear of each part of the mold (230), and comparing the calculated amount of wear with the amount of critical wear (240). Based on the comparison 240 between the calculated amount of wear and the amount of critical wear, it is possible to determine whether to perform the mold shape change 250 or the specification determination 260 as described above.

An example of a mold surface manufactured by a mold design method according to an embodiment of the present invention will be described with reference to FIG. The mold surface of FIG. 6 may be a mold surface of a mold manufactured by reflecting the mold shape change 250 of FIG. 1 twice. The mold shape change 250 may be reflected one or more times depending on the characteristics of the product desired by the consumer. Therefore, the mold surface 400 in FIG. 6 is described as an example for illustrating the technical idea of the present invention, and thus the present invention is not limited thereto.

Referring to FIG. 6, the mold surface 400 may include a base portion 410, and reinforcing portions 420 and 430 reflecting the mold shape change 250 (FIG. 1) described in FIG. The base portion 410 may be formed of a base mold material generally used to reduce the production cost. The reinforcing portions 420 and 420 may include first and second reinforcing portions 420 and 430 having improved abrasion resistance than the base portion 410.

In one example, at least one of the first and second reinforcing portions 420, 430 may be a portion that increases the hardness by treating the surface of the base mold material of the base portion 410. For example, the base portion 410 may be formed of the second material layer 10B of FIG. 2, and at least one of the first and second reinforcing portions 420 and 430 may include a base portion 410 The first material layer 10A may be formed by treating a part of the surface of the first material layer 10A to improve the hardness H thereof. For example, at least one of the first and second reinforcing portions 420 and 430 may be formed by nitriding a portion of the base portion 410 to harden the surface, or to harden a portion of the base portion 410 The height may include a coating treatment, or a local laser heat treatment to increase the hardness of a portion of the base portion 410. Alternatively, at least one of the first and second reinforcing portions 420 and 430 may be made of a different mold material than the base portion 410. Therefore, the mold surface 400 having the locally reinforced portions 420 and 430 can be designed and a mold can be manufactured using such a mold design. While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative and not restrictive in every respect.

10: Mold material
300: Automobile body structure
310: Automotive parts
350: blank
400: mold face
410: Base portion
420, 430: reinforcement portion

Claims (9)

A molding analysis is carried out including securing the physical property of the molding material and designing the shape of the blank and the mold surface,
Forming a preliminary mold by using the shape of the blank and the design of the mold surface in the molding analysis,
Calculating a wear amount of each part of the preliminary mold,
Comparing the calculated amount of wear of each part of the preliminary mold with the amount of critical wear to change the shape of the part of the preliminary mold where the calculated amount of wear is larger than the critical amount of wear,
Calculating a wear amount of the portion where the mold shape is changed,
And comparing the calculated amount of wear of the portion where the mold shape is changed with the amount of critical wear to determine the specification of the mold when the calculated amount of wear of the portion where the mold shape is changed is smaller than the critical wear amount.
delete The method according to claim 1,
The calculation of the wear amount of each part of the preliminary mold is calculated by the following equation,

Where W _depth denotes a wear depth, k denotes a wear coefficient, H denotes a hardness of the preliminary mold, P denotes a contact pressure between the preliminary mold and the blank, v denotes a contact pressure between the preliminary mold and the blank, A relative speed between the blanks; and t represents a time.
The method according to claim 1,
The material of the preliminary mold is a base mold material,
And changing a portion of the preliminary mold where the calculated wear amount is larger than the critical wear amount to a mold material having higher wear resistance than the base mold material.
Molding analysis is performed on the molding material,
The mold analysis is performed on the preliminary mold formed of the base mold material using the molding analysis to calculate the wear amount of each part of the preliminary mold,
Wherein a portion of the preliminary mold having a large amount of abrasion is changed to a mold material having higher abrasion resistance than the base mold material or a surface treatment specification for increasing abrasion resistance of the base mold material is applied,
A part of the mold material in the preliminary mold is changed, or a part of the mold subjected to the surface treatment specification is subjected to a mold analysis to calculate a wear amount of each part of the mold,
Wherein the specification of the mold is determined when the calculated wear amount of each part of the mold is smaller than the critical wear amount.
Molding analysis for molding material, blank shape and mold surface design,
The amount of wear of each portion of the preliminary mold formed of the base metal material is predicted using the above-described molding analysis,
And changing a specification of a portion having a large wear amount among the respective portions of the preliminary mold,
Changing the specification of the portion of the preliminary mold having a large amount of wear
The predicted wear amount of each part of the preliminary mold is compared with the critical wear amount,
And determining a portion of the preliminary mold where the predicted wear amount is greater than the critical wear amount as a mold material having a wear resistance higher than that of the base mold material.
The method according to claim 6,
The molding analysis includes securing the physical property of the molding material and designing the shape of the blank and the mold surface,
Wherein predicting the wear amount of each part of the preliminary mold is performed by forming the preliminary mold using the shape of the blank and the design of the mold surface in the molding analysis, securing the wear coefficient of the preliminary mold and physical properties of the mold material, Calculating the wear amount of each part of the mold,
A mold design method for determining a specification with the base mold material or a specification with a mold material whose specification is lower than that of the base mold material in a portion of the preliminary mold where the predicted amount of wear is smaller than the critical wear amount .
8. The method of claim 7,
The calculation of the wear amount of each part of the preliminary mold is calculated by the following equation,

Where W _depth denotes a wear depth, k denotes a wear coefficient, H denotes hardness of the preliminary mold, P denotes a contact pressure between the preliminary mold and the blank, v denotes a contact pressure between the mold and the blank, A relative speed between blanks, and t represents time.
The method according to claim 6,
Wherein the base mold material comprises a first material layer, a second material layer under the first material layer, and a third material layer under the second material layer, wherein the first material layer comprises the second and third materials Wherein the second material layer has a lower abrasion modulus than the third material layer, but has a higher hardness,
Wherein the mold material having increased abrasion resistance than the base mold material is a material having a hardness higher than that of the first material layer of the base mold material.

Images