KR102050571B1 - Bead modeling method for press mold - Google Patents

Abstract

The present invention relates to a bead modelling method of a press mold and, more particularly, to a bead modeling method of a press mold which can minimize additional man hours after processing while increasing the accuracy of press processing by making sure that bead clearance has a constant value regardless of the slope of a die face included in a press mold. The bead modelling method of a press mold comprises a sous vide modeling step, a clearance application step, a first fillet processing step, a tangent surface generation step, a relief application step, and a second fillet processing step.

Description

Bead modeling method for press mold

The present invention relates to a bead modeling method of a press die, and more particularly, to ensure that the clearance of the beads has a constant value irrespective of the slope of the die face included in the press die to improve the accuracy of the press working and at the same time finished Afterwards, the present invention relates to a bead modeling method of a press mold to minimize additional labor.

In general, press work refers to a process of cutting a metal sheet into predetermined dimensions or plastic deformation into a desired shape by using a mold and a tensile force and a compressive force, such as shearing, bending, drawing, molding, compression, etc. Collectively referred to as press working.

The mold used for the press working is largely composed of a holder, a punch and a die. When an initial blank such as a sheet material is put into the mold, the mold is fixed by the die and the holder, and the punch is transferred to complete the final product.

A bead is usually formed in such a press mold, and the bead is used for the purpose of controlling the amount of initial blank introduced into the mold.

That is, when the initial blank, that is, the material is introduced into the press mold, unevenness may occur in the forming process depending on the degree of inflow, and the material may burst or wrinkle, and the bead of the material may not be generated. It will control the inflow rate.

Typically, the bead protrudes to have a semi-circular cross section on the upper die (die) of the press die, and a recess similar to the shape of the bead is formed in the lower die (holder) corresponding to the position of the bead as shown in FIG. 1. In the following description, the beads protruding from the upper mold will be referred to as 'sub beads', and the recesses formed in the lower mold will be referred to as 'arm beads'.

The bead allows or inhibits the inflow of the material by friction. As can be seen in FIG. 1, the suppression force by the friction is acted on in all three parts, and between the bead and the arm bead of the material. A gap larger than the thickness is formed so that unnecessary interference is not generated in the part except the section in which the restraint force acts upon the inflow of the material.

At this time, the gap formed between the sub-bead and the arm bead is a relief (relief) means the distance between the center of the arm bead and the surface of the material when the material is injected, both sides and the material of the arm bead if the material is injected The clearance between the surface of the (clearance) can be divided into (clearance), in order to avoid unnecessary interference in the input process of the material, what is the value of the clearance is kept constant on both sides of the sud and arm bead More important.

The clearance between the sued and arm beads formed in the conventional press die is kept constant at both sides when the die face has a slope of 0, but when the slope of the die face is not 0, both sides of the beads, That is, there was a problem in that the clearance between the material inlet and outlet side is different from each other.

That is, in the case where the conventional suede and the armed bead are formed at a portion where the slope of the die face is not zero, as shown in FIGS. 2A and 2B, the relief between the material and the center of the armed bead is appropriate. Although the spacing was maintained, the clearance d on the side where the material is introduced and the side that is discharged is not kept constant, but also a difference occurs in the size thereof.

This difference is actually very fine, but this difference is the result of the defects in the result and a significant cost to modify the result.

1. Republic of Korea Patent Publication No. 10-0903320 (2009. 06. 18. notification.)

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to improve the accuracy of the press working by ensuring that the bead clearance has a constant value regardless of the slope of the die face included in the press die At the same time, it provides a bead modeling method of the press die to minimize the additional maneuvering after further processing is completed.

The present invention for achieving the above objects,

The modeling of the suede having a semicircular longitudinal section protruding from the upper die of the press die, and the same as the suede to model the arm bead formed at a position corresponding to the suede at the lower die of the press die. A clearance application step of forming a groove having a shape and then offsetting it by a predetermined clearance amount, a first fillet processing step of filling both ends of the groove offset by the clearance amount to a predetermined value, and the filleted portion; The tangent plane generation step of generating a tangent plane at the intersection of the grooves offset by the clearance amount, and the grooves protruding outward of the tangent plane after forming a groove having a curved surface having the same shape as the suede to which the predetermined relief condition is applied. Relief application step and the relief to remove the tangent surface protruding out of the curved surface and groove And a second fillet processing step of generating a new shape in contact with the bottom surface of the center portion of the groove formed in the applying step and the tangent surfaces generated in the tangent surface generating step by the fillet processing.

At this time, it is characterized in that it further comprises a step of confirming whether the intaglio is generated whether or not the intaglio has been generated in the tangent surface generated after the tangent surface generation step.

Here, when it is confirmed that the intaglio has been generated in the step of confirming whether the intaglio has been generated, the sub-modeling step is characterized in that the fillet process after modifying the intaglio generated vertically.

In addition, in the step of confirming whether the intaglio is generated, it is regarded that the intaglio is generated at a die face angle of 25 ° or more when the height of the sud is 6 mm. If the height is 4mm, the indentation is considered to occur at a die face angle of 39 ° or more; if the height is 3mm, it is considered to be intaglio at a die face angle of 48 ° or more. It is characterized by.

In addition, the subordinate modeling step may include a centerline designation step of setting a centerline at a position where a subordinate is to be formed, an offset step of offsetting both sides by a half of a width of a preset subid from the centerline, and a pre-set from the centerline. And a curve forming step of forming a curve connecting the upper surface portions of the vertical plane formed in the vertical plane forming step and the two side points offset in the offset step and the vertical plane forming step. do.

In addition, when the height of the preset sub-surface is two or more, in the vertical plane forming step, after forming a vertical plane corresponding to each height, it is characterized in that for connecting the vertical planes having different heights by splines.

According to the present invention, the bead has a constant value regardless of the inclination of the die face included in the press die, thereby improving the accuracy of the press working and at the same time, further effect to minimize the additional maneuver after the additional processing is completed Has

In addition, according to the present invention, since the clearance of the beads has a constant value regardless of the inclination of the die face, the same result as in the virtual plastic machining simulation can be additionally obtained through machining using an actual mold. .

1 is a cross-sectional view showing a state of beads formed in the press die.
(A), (b) is sectional drawing which showed the state which applied the bead formed in the conventional press die to the position where the inclination of a die face is not zero.
3 is a flow chart showing a bead modeling process of the press die according to the present invention.
Figure 4 (a) to (f) is a view showing the process of the subordinate modeling step of the present invention shown in FIG.
Figures 5 (a), (b) is a view showing the operation in the clearance application step of the present invention shown in FIG.
Figure 6 (a), (b) is a view showing the operation in the first fillet processing step of the present invention shown in FIG.
7 (a) and 7 (b) are views showing operations in the tangent plane generation step of the present invention shown in FIG.
8 (a) to (d) is a view showing the angle of incidence according to the height of the suede.
9 (a) to 9 (d) are views showing operations in the relief application step of the present invention shown in FIG.
10 is a view showing a state after the second fillet processing step of the present invention shown in FIG.
11A to 11H illustrate a bead modeling process when an intaglio is generated by an angle of a die face.
12 is a view showing the appearance of the final bead modeled by the present invention.
13 (a) to 13 (d) are cross-sectional views showing actual dies modeled by the present invention and die die sections thereof.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the bead modeling method of the press die according to the present invention.

Figure 3 is a flow chart illustrating a bead modeling process of the press die according to the present invention, Figure 4 is a view showing the process of the modeling step of the present invention shown in Figure 3, Figure 5 (a), (b) is 3 is a view showing the operation in the clearance application step of the present invention shown in Figure 3, Figure 6 (a), (b) is a view showing the operation in the first fillet processing step of the present invention shown in Figure 3, 7 (a), (b) is a view showing the operation in the tangent plane generation step of the present invention shown in Figure 3, Figure 8 (a) ~ (d) is the intaglio generating angle according to the height of the suede 9 (a) to 9 (d) show the operation in the relief application step of the present invention shown in FIG. 3, and FIG. 10 shows the completion of the second fillet processing step of the present invention shown in FIG. Figure 11 (a) ~ (h) is an intaglio generated by the angle of the die face 12 is a view showing a bead modeling process, Figure 12 is a view showing the appearance of the final bead modeled by the present invention, Figure 13 (a) ~ (d) is a real mold modeled by the present invention and its die It is a figure which shows a face cross section.

According to the present invention, the clearance of the beads, that is, the clearance between the sub-bead 12 and the arm bead 22 has a constant value regardless of the inclination of the die face included in the press die, thereby improving the accuracy of the press working and simultaneously processing. After the completion of the present invention relates to a bead modeling method of the press mold to minimize the additional maneuver, the configuration is largely as shown in Figure 3, the modeling step (S10), the clearance application step (S20), the first fillet It comprises a processing step (S30), tangent surface generation step (S40), a relief application step (S60) and a second fillet processing step (S70).

Before describing this, in order to apply the bead modeling method of the press mold according to the present invention, it is necessary to know in advance five condition values necessary for the formation of beads, which is the width (a) and the number of the suds 12 shown in FIG. 1. The height (b) of the bead 12, the relief (c), the clearance (d), and the round value (e) of the end of the arm bead 22, where the relief (c) is the In the state, it means the distance between the material and the arm bead 22 at the center of the bead, the clearance (d) means the distance between the material and the arm bead 22 at about 45 ° both sides with the material inserted. The round value e at the end of the arm bead 22 means a radius of curvature of the curved portion formed at both ends of the arm bead 22.

Since the five condition values are conventionally used for bead modeling, a detailed description thereof will be omitted.

In addition, in the present invention, the optimum bead numerical value was calculated using a plastic analysis software called 'Autoform', and the modeling of the beads can be performed using 3D design software such as Catia and Ug. .

Hereinafter, the bead modeling method of the press mold according to the present invention in more detail, first, the submerged modeling step (S10) is the suede 12 having a semi-circular longitudinal cross-section protruding to the upper mold 10 of the press mold Relates to the step of modeling.

Typically, when the suede 12 is formed on the upper die 10 of the press die, the female bead 22 corresponding to the lower die 20 is formed, and conversely, the suede 12 is formed on the lower die 20 of the press die. Since the female bead 22 will be formed in the upper mold 10 when the upper mold 10 is formed, the following description is based on the formation of the female bead 12 in the upper mold 10 and the female bead 22 formed in the lower mold 20. This will be described.

The subordinate modeling step S10 includes a centerline designation step S12, an offset step S14, a vertical plane forming step S16, and a curve forming step S18. It is a step of selecting a position where the suede 12 is to be formed in the upper die 10 of the mold.

In more detail, in the centerline designation step S12, the position of the centerline 16 of the suede 12 protruding from the upper die 10 is designated. As shown in FIG. Center line to a point about 20mm away from the fillet portion 14, ie, the edge of the fillet portion 14 of the upper die 10, where the punch and the die face meet to secure the flat portion of the material flowing into the Select (16).

That is, in order to secure the flat portion of the material flowing into the press die, the distance between the edges of the fillet portion 14 of the top 12 and the top 12 must be about 10 to 15 mm, so that the commonly used sud Considering that the width of (12) is about 11 to 13 mm, it is preferable to set the position of the centerline 16 of the suede 12 to about 20 mm from the edge of the fillet portion 14 of the upper die 10.

Next, the offset step (S14) relates to the step of displaying the width of the suede (12), based on the center line (16) determined in the centerline designation step (S12), the predetermined preset of both sides ( 12) The width corresponding to the length of 1/2 is displayed by offsetting the length corresponding to the length of 1/2.

Next, the vertical surface forming step (S16) relates to displaying the height of the suds 12, to form a vertical surface 18 having a height corresponding to the height of the preset suds 12 from the center line 16 Let's do it.

At this time, when the height of the plurality of suves 12 formed in the upper mold 10 is two or more, as shown in (c) of FIG. 4, vertical surfaces 18 corresponding to the predetermined height of the suds 12 are formed, respectively. Then, the height of the suds 12 corresponding to the respective vertical planes 18 are regarded as slowly changing and connected by splines.

As such, after the vertical planes 18 are connected to each other by splines, the vertical planes 18 are integrated into one line by using a join command, and the integrated lines are again displayed as shown in FIG. By changing to a smooth curve, it prevents unnecessary surface elements, such as fine bends, from occurring in the areas joined by the join command.

Next, the curve forming step (S18) relates to the step of forming the outer shape of the suede 12, the vertical surface at the corresponding position formed in the vertical surface forming step (S16) and the both sides offset in the offset step (S14) ( A curve connecting three points of the upper end of 18) is formed to complete the external modeling of the suede 12, as shown in FIG.

In general, since press modeling does not use an angular model, as shown in FIG. 4 (f), both ends of the formed suds 12, that is, the parts where the suds 12 meet the die face are minimized. Of course, you can fillet the R value.

On the other hand, Figure 4 (a) ~ (f) of the above-described sub-model modeling step (S10) shows the process of working upside down for convenience of description, which will be described later in Figures 5,6,7 ( The same applies to a), FIGS. 9A to 9C, and FIG. 10.

As described above, after the modeling of the subid 12 protruding from the upper die 10 is completed, the female bead 22 formed in the groove shape is formed in the lower die 20 at a position corresponding to the position of the subid 12. The modeling of the arm bead 22 is a clearance application step (S20), the first fillet processing step (S30), tangent surface forming step, relief application step (S60) and the second fillet processing step (S70) It is made to include.

In more detail, the clearance applying step (S20) is a lower condition 20, both sides of the clearance condition, that is, the material is inserted into the groove-shaped arm bead 22 is formed in a shape corresponding to the suede 12 The condition for the distance between the material and the arm bead 22 at an angle of about 45 ° is intended to be applicable.

That is, as shown in (a) and (b) of FIG. 5, after forming the same groove as the shape of the suede 12 formed in the above-described subid modeling step S10 on the surface of the lower mold 20, By offsetting the inner side, i.e., the depth direction, by a predetermined amount of clearance, an overall smooth curved groove is formed.

Next, the first fillet processing step (S30) relates to the step of fillet (fillet) the connection portion between the both ends of the groove, that is, offset between the groove and the lower die 20 surface offset by the clearance amount, Figure 6 As shown in (a) and (b), the round value of the end of the predetermined arm bead 22, that is, both ends of the groove offset by the amount of clearance in the radius of curvature is filleted.

At this time, after filling both ends of the groove as described above, the curved portion offset by the clearance amount except for the filleted portion is removed to reduce confusion in the steps described later, and unnecessary work processes or calculations occur in the modeling process. Do not

Next, the tangent plane generation step (S40) relates to a step of generating the tangent plane 24 at the intersection of the filleted portion and the groove offset by the clearance amount, as illustrated in FIGS. 7A and 7B. As shown, the tangent surface 24 is created in the tangential direction from the end of the filleted surface and formed in the depth direction of the arm bead 22.

That is, as described above, when the curved surface portion offset by the clearance amount except the filleted portion is deleted, the tangent surface 24 may be formed by generating a face in a tangential direction with respect to the curvature radius of the end portion of the filleted curved surface. This tangent surface 24 serves to ensure that the clearance between the suede 12 and the arm bead 22 has a constant value regardless of the slope of the die face.

At this time, after the tangent plane generation step (S40) may further include whether the intaglio generation step (S50), the intaglio generation check step (S50) is whether or not the intaglio generated on the generated tangent surface (24). And the intaglio is the inclination of the tangent surface 24 formed on the upper part of the inclined die face when the intaglio is displayed on the horizontal plane as shown in FIG. 11 (a). This means the case.

That is, the intaglio generated on the tangent surface 24 means that the intaglio is also generated on the arm bead 22 that has been modeled. When the intaglio is generated on the arm bead 22, the molding of the material using the press mold is performed. Interference may occur in the incoming material when the input of the material may not be made properly, so that the indentation is generated after generating the tangent surface 24.

When the intaglio is generated on the tangent surface 24, the method returns to the subordinate modeling step S10 to perform the subordinated modeling again, which will be described later.

On the other hand, the intaglio generated on the tangent surface 24 as described above is correlated with the angle of the die face with respect to the height of the subsurface 12 and the horizontal plane, the test results of Figure 8 (a) ~ (d As shown in FIG. 6, the intaglio is generated at a die face angle of 25 ° or more when the height of the sudder 12 is 6 mm, and the intaglio is generated at a die face angle of 31 ° or more when the height of the suicide 12 is 5 mm. In the case where the height of the suicide 12 was 4 mm, an intaglio occurred at a die face angle of 39 ° or more, and when the height of the suicide 12 was 3 mm, an intaglio occurred at a die face angle of 48 ° or more. .

At this time, the angle of the die face can be confirmed by the above-described design software, in the case of circular beads such as the present invention, the height of the bead is usually set to 3 ~ 6mm, when using a rectangular bead that exceeds 6mm In consideration of the intaglio generating condition as described above, it is possible to check whether the intaglio is generated in advance through the height of the sub-12 and the angle of the die face.

Next, the relief application step (S60) relates to the step of applying a relief condition between the material and the arm bead 22, such a relief condition due to the interference by the lower end of the arm bead 22 in the inflow of the material This is to prevent the inflow of the material from being controlled.

Typically, the relief condition is set from about the thickness of the material + 0.5 ~ 1.0mm from the bottom surface of the suede 12, if such a relief condition is not applied not only the interference occurs in the inflow of the material but also many problems during plastic working Will occur.

If such a problem occurs, the female bead part 22 must be reworked, but due to a lot of airborne processes, the bead 12 is usually processed, and thus the molding result is changed, causing a failure rate to be increased. .

In the relief application step (S60) having the above purpose, as shown in FIG. 9 (a), first, a groove made of a curved surface having the same shape as the suede 12 to which a predetermined relief condition is applied, that is, offset by a relief condition. After the formed groove is formed, as shown in FIGS. 9B and 9C, the curved surface of the groove to which the relief condition protruding to the outside of the tangent surface 24 is applied, and the groove to the outside of the groove to which the relief condition is applied, is shown. The tangent surface 24 is removed.

Next, the second fillet processing step (S70) relates to the step of completing the modeling of the arm bead 22, as shown in Figure 9 (d), the bottom surface of the center of the groove formed in the relief application step (S60) And a circle having a new shape in contact with both tangent surfaces 24 generated in the tangent plane generation step S40 by fillet processing, and then the filleted portion and the newly formed circle in the first fillet processing step S30. By connecting the intersection points and removing the remaining parts, as shown in FIG. 10, the shape of the completed arm bead 22 can be obtained.

At this time, the three surfaces generated in the second fillet processing step (S70), the bottom surface of the central portion of the groove formed in the relief application step (S60), and a new shape of contact with both tangent surfaces 24 is a 'Tritangent' of the software described above. Can be generated by the command Fillet '.

11 (a) to 11 (h) show the bead modeling process when the above-described intaglio is generated, and the bead when the die face angle is 45 ° when the height of the suede 12 is 6 mm is shown. The modeling process is shown.

That is, as described above, in the case where the height of the suede 12 is 6 mm, an intaglio is generated at a die face angle of 25 ° or more, so that an intaglio occurs as shown in FIG. 11A when the angle of the die face is 45 °. In this case, as shown in (b) of FIG. 11, in the process of modeling the sud 12, the portion where the intaglio is generated is vertically corrected, and then the fillet is connected to the die face so that the sud 12 ) Can be modeled.

In more detail, after forming the suds 12 by the same method as in the case where no intaglio is generated, the intaglio is removed, and the end of the remaining portion is extended in the vertical direction to connect with the die face. After filleting the connection with the die face to the minimum R value, the modeling of the suede 12 in the case of intaglio is completed.

Next, (c) to (g) of FIG. 11 are the above-described clearance application step (S20), the first fillet processing step (S30), the tangent plane generation step (S40), the relief application step (S60), and the second fillet, respectively. As shown in the processing step S70, after the modeling of the suede 12 is completed, when the female bead 22 is modeled by the same process as in the above-described embodiment, the bead modeling process in the case of intaglio is completed.

FIG. 11 (h) shows the suds 12 and the arm beads 22 when the height of the suds 12 modeled by the above-described process is 6 mm and the angle of the die face is 45 °. It can be seen that the clearance at is equal to 0.3 mm.

FIG. 12 shows the final beads modeled according to the present invention, that is, the beads 12 and the arm beads 22. As described above, the clearance of the beads has a constant value regardless of the slope of the die face. Has the advantage of being.

In addition, Figure 13 (a) shows the actual mold modeled by the present invention, Figure 13 (b) ~ (d) is a cross-sectional view showing the sections A, B and C shown in (a), respectively. It can be seen that the clearance between the suede 12 and the arm bead 22 applied to the die face section having the upward slope, the slope 0, and the downward slope, respectively, is the same on both the left and right sides of the center.

Therefore, according to the bead modeling method of the press die according to the present invention as described above, the clearance of the beads to have a constant value regardless of the slope of the die face included in the press die to improve the accuracy of the press working and at the same time additional In addition to minimizing additional man-hours after the machining is completed, the clearance of the beads has a constant value regardless of the slope of the die face. Thus, the same result as in the virtual plastic machining simulation can be obtained through machining with a real mold. It is possible to have various advantages such as being able to.

Although the above embodiments have been described with respect to the most preferred examples of the present invention, it is not limited to the above embodiments, and it will be apparent to those skilled in the art that various modifications are possible without departing from the technical spirit of the present invention.

The present invention relates to a bead modeling method of a press die, and more particularly, to ensure that the clearance of the beads has a constant value irrespective of the slope of the die face included in the press die to improve the accuracy of the press working and at the same time finished The present invention relates to a method of bead modeling of a press die to minimize additional man-hours.

10: hieroglyphic 12: defend
14 fillet portion 16: center line
18: vertical plane 20: lower mold
22: Ambid 24: tangent side
S10: Subordinate Modeling Step S12: Centerline Designation
S14: offset step S16: vertical plane forming step
S18: curve forming step S20: clearance applying step
S30: first fillet processing step S40: tangent plane generation step
S50: check whether the intaglio occurs S60: step of applying relief
S70: second fillet processing step

Claims (6)

In the method of modeling the beads of the press mold using 3D design software,
A sud modeling step of modeling a suid having a semi-circular longitudinal section protruding from an upper mold of a press die;
A clearance application step of forming a groove having the same shape as the seed in order to model the arm bead formed at a position corresponding to the seed in the lower mold of the press die, and offsetting the predetermined clearance amount;
A first fillet processing step of filling the both ends of the groove offset by the clearance amount to a predetermined value;
A tangent plane generation step of generating a tangent plane at the intersection of the filleted portion and the groove offset by the clearance amount;
A relief application step of forming a groove having a curved surface having the same shape as a suede to which a predetermined relief condition is applied and then removing the curved surface of the groove protruding outward of the tangent surface and the tangent surface protruding out of the groove;
And a second fillet processing step of generating a new shape in contact with the bottom surface of the center portion of the groove formed in the applying step and the tangent surface generated in the step forming step by fillet processing. Bead modeling method.
The method of claim 1,
Bead modeling method of the press die, characterized in that further comprising the step of confirming whether the intaglio has been generated whether the intaglio generated on the tangent surface generated after the tangent surface generation step.
The method of claim 2,
When it is confirmed that the intaglio has been generated in the step of confirming the intaglio generation, the bead modeling method of the press mold, characterized in that the fillet process after modifying the vertical portion of the intaglio generated vertically.
The method of claim 2,
In the step of checking whether the intaglio is generated, it is regarded that the intaglio is generated at the die face angle of 25 ° or more when the height of the sud is 6 mm, and the intaglio is generated at the die face angle of 31 ° or more when the height of the sud is 5 mm. In the case where the height of the sud is 4mm, the intaglio is considered to be generated at the die face angle of 39 ° or more, and when the height of the sud is 3mm, the intaglio is considered to be generated at the die face angle of 48 ° or more. Bead modeling method of a press die.
The method of claim 1,
The subordinate modeling step may include a centerline designation step of setting a centerline at a position where a subid is to be formed;
An offset step of offsetting both sides by a half of a width of a preset sud from the center line,
A vertical plane forming step of forming a vertical plane corresponding to a height of a predetermined subid from the center line;
And a curve forming step of forming a curve connecting the two points offset from the offset step and the upper end of the vertical plane formed in the vertical plane forming step.
The method of claim 5,
In the vertical plane forming step, if the predetermined height of the sud is two or more, each of the vertical planes corresponding to each height is formed, and then the bead modeling of the press die, wherein the vertical planes having different heights are connected by splines. Way.

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