JP4575566B2 - Press molding die and method of preventing inflow of work using the press molding die - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press molding die and a method for preventing inflow of a workpiece using the press molding die, and in particular, a press molding die that is used to perform combined processing of wrist-like processing and trim processing on a workpiece that has been previously drawn. and a inflow prevention method of a workpiece using the press molding die.
[0002]
[Prior art]
For example, the process of press molding a door panel of an automobile, etc., using a panel material as a work, includes a draw process for drawing the work, and a work in which the drawing radius is formed larger than the shape of the final product in the draw process. The trimming process includes cutting the unnecessary part other than the product as scrap from the work that has been shaped into the final product in the restricing process.
[0003]
Conventionally, with a press forming form die 15 as shown in FIG. 5, was conducted restriking step and the trim process at the same time. Press forming forms mold 15 has a punch 4 provided on the side of the list punch 3 and Listing punch 3, above the list punch 3 and the punch 4, lists the punch 3 the workpiece 2 respectively punch 4 The wrist die 5 and the trim die 16 that are pressed against each other are arranged so as to be freely movable up and down. At the lower end of the trim die 16, a cutting blade 7 is formed so as to face the trim punch 4 and cut the workpiece 2 together with the trim punch 4.
[0004]
Then, when the workpiece 2 to the press formed shape, lists die 5 and trim die 16 are lowered integrally toward Listing punch 3 and the punch 4 presses the workpiece 2 Listing punch 3 and the punch 4. At this time, the wrist forming part 12 of the work 2 is bent by the wrist punch 3 and the wrist die 5, and at the same time, the cutting part 13 of the work 2 is cut by the trim punch 4 and the cutting edge 7 of the trim die 16.
[0005]
[Problems to be solved by the invention]
However, in the conventional technique, when the workpiece 2 is bent, the tip of the workpiece 2 is pulled in the direction of the trim punch 4 (the direction of arrow B in the drawing) by the amount of the wrist molding amount S of the workpiece 2. There was a problem of inflow. When the workpiece 2 flows in the direction of the arrow B, the position of the cutting portion 13 of the workpiece 2 is shifted when the workpiece 2 is cut, so that the cutting portion 13 is wrinkled. This is because the depth at which the workpiece 2 is bent during the wrist-like process is different in the width direction of the workpiece 2, and the amount of inflow of the workpiece 2 varies depending on the difference in depth.
[0006]
The present invention has been made to solve these problems, when the workpiece to press formed shape, prevents the workpiece from flowing in the direction of the punch, a cutting portion of a workpiece due to the inflow of the workpiece It is an object of the present invention to provide a press mold that can prevent wrinkles and a method for preventing the inflow of a workpiece using the press mold.
[0007]
[Means for solving problems]
The present invention is a press-molding die for trimming a workpiece, which is arranged in a vertically divided manner and previously subjected to a draw- like molding into a predetermined shape in a drawing process in a draw mold. A wrist punch for bending and forming, a trim punch for cutting the workpiece, and a wrist die that moves up and down with respect to the wrist punch and presses the workpiece against the wrist punch, A trim die that is arranged in parallel with the wrist die and moves up and down integrally with the wrist die to press the workpiece against the trim punch, and is formed in advance in the draw step at the side of the trim punch at the tip of the workpiece. a workpiece regulating portion for positioning the workpiece the step and in contact with, the bottom of the trim die, opposite to the workpiece restricting portion Characterized in that and a workpiece clamping portion for preventing the clamping to the said workpiece lifted over the step with the work restricting portion.
[0008]
By comprising in this way, when press-molding a workpiece | work, the front-end | tip part of a workpiece | work can be positioned .
In addition, by this configuration, when the press forming forms the workpiece, it is possible to prevent the tip of the workpiece from being lifted.
[0009]
The present invention is, using said claim 2 Press forming forms die according, disposed vertically divided, and restriking molded machined workpiece aperture in the draw step to a predetermined shape in advance the draw type while a inflow prevention method of a work in a press mold for the trimming, the press molding die, a list punch to bend the workpiece, is provided on the side of the list punch, the workpiece A trim punch that cuts up and down, a wrist die that moves up and down relative to the wrist punch, and presses the workpiece against the wrist punch, and is arranged in parallel with the wrist die and moves up and down integrally with the wrist die, and the workpiece a trim die for pressing the punch and the side of the punch, the formed in advance the draw step to the tip of the work step A workpiece regulating portion for positioning the workpiece in contact with the bottom of the trim die, the opposite to the workpiece regulating portion, the workpiece clamping portion to sandwich the step together with the workpiece restricting portion prevents the said workpiece floats And supporting the work by bringing the step into contact with the work restricting portion, and holding the step of the work from the horizontal direction between the work restricting portion and the work holding portion, In a state where the step of the workpiece is started and the step of the workpiece is clamped in the horizontal direction by the workpiece regulating portion and the workpiece clamping portion, the trim die is lowered while performing the workpiece like-mold molding. And a step of cutting the workpiece.
[0010]
By comprising in this way, when press-molding a workpiece | work, it can prevent that a workpiece | work flows in the direction of a trim punch .
In addition, by this configuration, when the workpiece to press formed shape, the workpiece can be more reliably prevented from flowing in the direction of the punch.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 is a longitudinal sectional view showing a press formed shape die 1 of the present invention. Press forming forms die 1 includes a restriking step for finishing the workpiece 2 which is formed by drawing at a pre-draw process to a depth of Shoyo, unnecessary portions other than the product from the work 2 which was the shape of the final product on a restriking step It is used to carry out trim processes for cutting as scrap at the same time. Note that a step 14 that is bent downward by one step is formed at the tip of the work 2 in advance.
[0012]
Press forming forms mold 1, as shown in FIG. 1, a list punch 3 for bending a workpiece 2, provided on the left side of the list punch 3, punch 4 to cut the workpiece 2 with the cutting edge 7 to be described later A wrist die 5 that presses the workpiece 2 against the wrist punch 3 is disposed above the wrist punch 3 so as to be movable up and down with respect to the wrist punch 3.
[0013]
A trim die 6 is juxtaposed on the left side of the wrist die 5. The trim die 6 moves up and down integrally with the wrist die 5 and presses the work 2 against the trim punch 4. A cutting blade 7 is formed at the lower right end of the trim die 6, and the cutting blade 7 cuts the workpiece 2 together with the trim punch 4 when the trim die 6 presses the workpiece 2 against the trim punch 4.
[0014]
On the left side of the trim punch 4, a work restricting portion 8 is disposed facing the trim die 6. A contact portion 9 is formed on the upper portion of the work restricting portion 8 so as to contact the step 14 of the work 2 from the right side and to contact the lower surface of the work 2 extending from the upper end of the step 14. Position the tip of the.
[0015]
Further, a workpiece clamping unit 10 is formed at the lower portion of the trim die 6 so as to face the workpiece clamping unit 10. The workpiece clamping unit 10 abuts the step 14 of the workpiece 2 from the left side and abuts the upper surface of the workpiece 2 extending from the lower end of the step 14 to prevent the tip of the workpiece 2 from floating. The workpiece clamping unit 10 clamps the workpiece 2 together with the workpiece regulating unit 8 when the trim die 6 descends and comes into contact with the workpiece 2.
[0016]
Next, with reference to the press-forming die 1 will be described how the workpiece 2 to the press formed shape. First, as shown in FIG. 2, the wrist die 5 and the trim die 6 are lowered in the direction of the wrist punch 3 and the trim punch 4 (in the direction of arrow A in the figure), and the lower portion 11 of the wrist die 5 is formed into the wrist of the workpiece 2. It abuts on the part 12. At this time, the step 14 formed at the tip of the workpiece 2 is abutted and supported by the abutting portion 9 of the workpiece regulating portion 8.
[0017]
Subsequently, as shown in FIG. 3, the wrist die 5 and the trim die 6 are further lowered in the direction of arrow A, and the cutting edge 7 of the trim die 6 is brought into contact with the cutting portion 13 of the workpiece 2. The lower part 11 of the wrist die 5 presses the wrist forming part 12 of the work 2 in the direction of the wrist punch 3 to start bending the work 2. At this time, the step 14 of the workpiece 2 is clamped by the workpiece regulating portion 8 and the workpiece clamping portion 10. Therefore, the work 2 is prevented from flowing in the direction of the trim punch 4.
[0018]
Finally, as shown in FIG. 4, the wrist die 5 and the trim die 6 are further lowered in the direction of arrow A, and the workpiece 2 is cut by the cutting portion 13 with the cutting blade 7 and the trim die 5 of the trim die 6. Further, the wrist die 5 is completely lowered to complete the bending of the wrist forming portion 12 of the work 2.
[0019]
【The invention's effect】
From the above, according to the present invention, when the workpiece to press formed shape, the workpiece can be prevented from flowing in the direction of the punch. Therefore, wrinkles are not generated at the workpiece cutting portion.
[Brief description of the drawings]
1 is a cross-sectional view showing a press formed shape mold of the present invention.
FIG. 2 is a cross-sectional view showing a state in which a wrist-like process is started.
FIG. 3 is a cross-sectional view showing a state where a trimming process is started.
FIG. 4 is a cross-sectional view showing a state in which a wrist-like process and a trim process are completed.
5 is a cross-sectional view showing a conventional press forming shape method.
[Explanation of symbols]
1 Press forming forms die 2 Work 3 Listing punch 4 punch 5 lists the die 6 trim die 7 cutting edge 8 the work restricting portion 9 abutting portion 10 workpiece clamping portion 11 the lower 12 list forming unit 13 cutting member 14 stepped

Claims (2)

A press-molding die for trimming a workpiece, which is arranged divided into upper and lower parts and is previously subjected to a restrict- like molding of a work that has been previously drawn in a draw process in a draw mold ,
A wrist punch for bending the workpiece;
A trim punch provided on a side of the wrist punch for cutting the workpiece;
A wrist die that moves up and down with respect to the wrist punch and presses the workpiece against the wrist punch;
A trim die that is arranged in parallel with the wrist die, moves up and down integrally with the wrist die, and presses the workpiece against the trim punch ,
A workpiece regulating portion that positions the workpiece by abutting a step formed in advance in the draw step on the tip of the workpiece on the side of the trim punch ,
The bottom of the trim die, the opposite to the workpiece regulating portion, a press-molding die is characterized in that and a workpiece clamping portion to prevent the workpiece from being lifted by sandwiching the step with the work restricting portion . A method of preventing the inflow of a work in a press mold for trimming a work that is arranged in a vertical manner and trimmed in advance while being subjected to a redraw- like work in a draw process in a draw mold .
The press mold is
A wrist punch for bending the workpiece;
A trim punch provided on a side of the wrist punch for cutting the workpiece;
A wrist die that moves up and down with respect to the wrist punch and presses the workpiece against the wrist punch;
A trim die that is arranged in parallel with the wrist die, moves up and down integrally with the wrist die, and presses the workpiece against the trim punch ,
A workpiece regulating portion that positions the workpiece by abutting a step formed in advance in the draw step on the tip of the workpiece on the side of the trim punch ,
The bottom of the trim die, the opposite to the workpiece regulating portion, and a workpiece clamping portion to prevent the workpiece from being lifted by sandwiching the step together with the workpiece regulating unit,
A step of bringing the step into contact with the work restricting portion and supporting the work;
A step of starting re-striking molding of the workpiece in a state in which a level difference of the workpiece is clamped from the horizontal direction by the workpiece regulating unit and the workpiece clamping unit;
A step of lowering the trim die and cutting the work while performing a re-like molding of the work in a state in which the step of the work is held in a horizontal direction by the work restricting portion and the work holding portion. A method for preventing inflow of workpieces characterized by

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