JP5843712B2 - Mold and trim processing method - Google Patents

Description

  The present invention relates to a mold and a trim processing method. More specifically, the present invention relates to a mold having a lifter having a relief part for deforming the scrap downward when a product and scrap interfere with each other, and a trim processing method using the mold.

  Conventionally, trim processing is performed when manufacturing a side panel or the like of an automobile. When trimming a molding material, generally, the scrap portion after cutting falls together with the cutting and is conveyed by a shooter or the like. However, when it is difficult to install a shooter due to the design of the device, or when the scrap shape is ring-shaped and difficult to drop after cutting, a method of cutting while supporting the lower side of the scrap side of the molding material is adopted Is done. In this case, the scrap does not fall after cutting, and rises as the support below the scrap rises after trim forming.

  As an example of a mold for performing trim processing while supporting the lower surface of the scrap side of the molding material as described above, a press molding composite capable of press molding a molding material and performing trim processing together with the press molding A mold is known (see, for example, Patent Document 1).

  When trim processing is performed using such a press-molded composite mold, first, the molded material after press molding is gripped by the molded upper mold and the molded lower mold, and the scrap side is Is gripped by a scrap lifter provided on the upper side and a scrap holder provided on the upper side. Next, since the lower blade is provided in the molding lower mold and the upper blade is provided in the scrap holder, the scrap lifter and the scrap holder move downward relative to the molding upper mold and the molding lower mold. As a result, the molding material is cut into moldings and scraps. Subsequently, the scrap lifter and scrap holder moved downward relative to the molding upper mold and molding lower mold are returned to their original positions, the entire mold is raised, and further the molding upper mold and scrap holder are molded. Raise relative to the lower mold and scrap lifter and open the mold. In this way, the mold (product) and scrap can be taken out by opening the mold.

JP 2004-314147 A

  However, when trim molding is performed using a conventional press-molded composite mold, the cut portion of the product may be deformed. There are two possible reasons for the deformation.

  First, it is considered that when the molding material is cut, burrs and sagging occur at the cut parts of the product and scrap. When burrs or sagging occurs due to cutting of the molding material, if the scrap lifter and scrap holder are raised and returned to their original positions, the burrs or sagging may interfere with each other and the product side may be deformed.

  Secondly, when trim processing is performed using a press-molded composite mold, the force for drawing the workpiece to the product side works at the cut portion of the workpiece (molding material) by the press molding performed immediately before, and the molding material This is considered to be because the scrap side of the molding material is pulled out in the product direction when the molding material is cut because the area for gripping the scrap side is small. When the scrap is pulled out in the product direction at the time of cutting, the interference between the product and the scrap when the scrap lifter and the scrap holder are raised and returned to the original position increases, and the deformation of the product portion also increases. The actual product deformation is considered to be caused by a combination of the first cause and the second cause.

  The present invention has been made in view of the above, and an object thereof is to provide a mold and a trim processing method capable of suppressing deformation of a product due to interference between the product and scrap in a mold having a scrap lifter. There is.

  In order to achieve the above object, the present invention provides a mold (for example, a composite mold 1 for press molding described later) capable of cutting a molding material (for example, a steel sheet 10 described later) into a product part and a scrap part. The mold of the present invention includes a lower mold (for example, the movable die 22) that is in contact with the lower surface of the molding material on the product portion side, an upper surface of the molding material on the product portion side, and the product of the molding material together with the lower mold. A holder (for example, a pad 31) that sandwiches the part side and a holder (for example, a pad that is in contact with the upper surface on the scrap part side of the molding material and that can move up and down relative to the upper mold along the side surface of the upper mold. The scrap holder 32), which will be described later, and the lower surface of the molding material on the scrap portion side, sandwich the scrap portion side of the molding material together with the holder, and relative to the lower die along the side surface of the lower die And a lower blade (for example, described later) for cutting the molding material at the end of the lower mold and the boundary with the lifter. A lower blade 221), An upper blade (for example, an upper blade 321 to be described later) for cutting the molding material is provided at an end of a boundary between the holder and the upper mold, and an end of the lifter at the boundary with the lower mold. In the portion, the holder and the lifter are moved downward relative to the upper die and the lower die to cut the molding material, and then the holder and the lifter are attached to the product portion and the scrap. When the cutting part of the scrap part is moved upward relative to the upper mold and the lower mold until the cutting part has substantially the same height, the cutting part of the scrap part comes into contact with the cutting part of the product part Accordingly, an escape portion (for example, an escape portion 231 described later) for deforming downward is formed.

  Conventionally, a product cut when a molding material is trimmed and a burr or the like of a scrap cutting part interfere with each other, and the product cutting part may be deformed. This is because the structure of the conventional trim mold does not allow the deformation on the scrap side.

  On the other hand, in the present invention, the scrap part deforms downward when the scrap part interferes with the product part at the end of the boundary with the lower mold of the scrap lifter that contacts the lower surface of the scrap part side of the molding material. An escape part was provided. By this escape portion, when the molding material is trimmed, the scrap side is deformed by the force that the burrs and the like generated in the cut portion of the product and scrap interfere with each other, so that deformation on the product side can be suppressed.

  In this case, it is preferable that the escape portion is formed so as to be inclined downward toward the lower mold side.

  Since the escape portion provided in the lifter is inclined downward toward the lower mold side, the scraped portion can be more reliably deformed. In addition, the existing trim mold can be easily provided with a relief part simply by scraping the end of the boundary with the lower mold part corresponding to the lifter in the present invention. The existing mold can be used effectively, which is advantageous in terms of cost.

  Furthermore, the trim processing method which cut | disconnects a molding material in a product part (for example, below-mentioned steel plate 10) and a scrap part is provided. In the trim processing method of the present invention, the product part side of the molding material has an upper mold (for example, pad 31) in contact with the upper surface on the product part side and a lower mold (for example, movable die) in contact with the lower surface on the product part side. 22), and the scrap part side of the molding material is in contact with the upper surface of the scrap part side (for example, scrap holder 32 described later) and the lifter (for example, scrap described later) in contact with the lower surface of the scrap part side. A clamping step of clamping by the lifter 23), and the holder and the lifter are moved downward relative to the upper mold and the lower mold, and are provided at the end of the boundary between the lower mold and the lifter. A lower blade (for example, lower blade 221 to be described later) and an upper blade (for example, upper blade 321 to be described later) provided at an end of the boundary between the holder and the upper mold, the molding material is supplied to the product portion. The cutting step of cutting into scrap parts, and the holder and the lifter are relatively upward with respect to the upper mold and the lower mold until the cut parts of the product part and the scrap part have substantially the same height. When the product part and the cutting part of the scrap part are brought into contact with each other, the cutting part of the scrap part is brought into contact with an end part of the boundary between the lifter and the lower mold (for example, an escape part described later) And a deformation step of deforming toward the portion 231) side.

  In this case, it is preferable that the escape portion is formed so as to be inclined downward toward the lower mold side.

  According to this invention, there exists an effect similar to invention of said metal mold | die.

  ADVANTAGE OF THE INVENTION According to this invention, in the metal mold | die provided with the scrap lifter, the metal mold | die and trim processing method which can suppress the deformation | transformation of the product by interference of a product and scrap can be provided.

It is a longitudinal cross-sectional view of the compound metal mold | die for press molding which concerns on one Embodiment of this invention. It is a top view and an end view of a molded product formed by the composite mold for press molding according to the embodiment. It is a figure which shows operation | movement of the compound metal mold | die for press molding concerning the said embodiment. It is a figure which shows operation | movement of the compound metal mold | die for press molding concerning the said embodiment. It is a longitudinal cross-sectional enlarged view which shows operation | movement of the compound metal mold | die for press molding concerning the said embodiment. It is a longitudinal cross-sectional enlarged view which shows operation | movement of the conventional trim metal mold | die. It is a longitudinal cross-sectional enlarged view which shows operation | movement of the conventional trim metal mold | die. It is a longitudinal cross-sectional enlarged view of the modification concerning the trim metal mold | die of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The press-molding composite mold according to an embodiment of the present invention can be trimmed after press molding.

FIG. 1 is a longitudinal sectional view of a composite mold 1 for press molding according to this embodiment.
The press-molding composite mold 1 includes a lower mold mechanism 20 that is disposed on the lower side of the steel plate 10 and supports the steel plate 10, and an upper mold mechanism that is disposed on the upper side of the steel plate 10 and can be advanced and retracted relative to the lower mold mechanism 20. 30.
The lower mold mechanism 20 and the upper mold mechanism 30 are disposed to face each other with the steel plate 10 interposed therebetween.

  The lower die mechanism 20 includes a fixed lower die base 24, a lower die punch 21, a movable die 22 provided around the lower die punch 21, a scrap lifter 23 provided around the movable die 22, With

The lower die punch 21 abuts on the lower surface of the central portion of the steel plate 10 and presses the steel plate 10 upward to form an emboss.
The lower die punch 21 is fixed to the lower die base 24. The molding surface of the lower die punch 21 has the same shape as the emboss of the molded product to which the molding surface is transferred. A flange is provided around the lower portion of the lower punch 21, and a movable die 22 described later is supported by the flange.

The movable die 22 holds the steel plate 10 together with a pad 31 described later. The upper surface of the movable die 22 is horizontal.
A lower blade 221 corresponding to the trimming shape of the steel plate 10 is provided at the end of the boundary of the movable die 22 with the scrap lifter 23 described later. The movable die 22 is supported by a lower die punch 21 and a flange of a scrap lifter 23 described later.

  The scrap lifter 23 holds the end portion of the steel plate 10 together with a scrap holder 32 described later. The upper surface of the scrap lifter 23 is horizontal. The scrap lifter 23 is arranged so that its upper surface is positioned at the same height as the upper surface of the movable die 22 during press molding. A flange is provided inside the lower portion of the scrap lifter 23, and the movable die 22 is supported by the flange.

  Moreover, the edge part of the boundary with the movable die | dye 22 of the scrap lifter 23 inclines below toward the movable die | dye 22 side, and the escape part 231 is formed. The escape portion 231 enables the scrap portion after cutting to be deformed downward.

The scrap lifter 23 is supported by the lower mold base 24 via cushion pins 232. For this reason, the scrap lifter 23 can be moved up and down relatively with respect to the lower die punch 21. Scrap lifter 23 Since the movable die 22 is supported by the flange described above, if the scrap lifter 23 moves up and down relative to the lower die punch 21, the movable die 22 also moves up and down relative to the lower die punch 21. To do. However, since the movable die 22 is also supported by a flange provided around the lower portion of the lower die punch 21, it cannot be lowered below the height supported by the lower die punch 21.
The cushion of the cushion pin 232 is composed of a gas cylinder.

  The upper mold mechanism 30 includes an upper mold base 33, a pad 31, and a scrap holder 32 provided around the pad 31. Further, the upper mold mechanism 30 is provided with an elevating mechanism 34 for moving the upper mold mechanism 30 up and down.

The pad 31 is in contact with the upper surface of the steel plate 10 at the time of forming, and presses and presses the steel plate 10 downward.
The pad 31 is disposed so as to oppose the lower die punch 21 and the movable die 22. Further, the pad 31 is supported by the upper mold base 33 via the cushion 311. Furthermore, the periphery of the lower part of the pad 31 is recessed compared with the periphery of the upper part, and this recessed part is a shape complementary to the flange part of the scrap holder 32 mentioned later. For this reason, the pad 31 can be moved up and down relative to the lower mold mechanism 20 together with a scrap holder 32 described later. Further, the pad 31 can be moved up and down relatively with respect to the scrap holder 32 described later by the expansion and contraction of the cushion 311, but is lowered to a position where the lower surface of the end of the pad 31 is lower than the lower surface of the scrap holder 32. I can't do it.
The cushion 331 is composed of a gas cylinder.

The end portion of the pad 31 sandwiches the end portion of the steel plate 10 together with the movable die 22. The lower surface of the end portion of the pad 31 is horizontal, and the lower surface of the center portion has a shape corresponding to the shape of the molding surface of the lower die punch 21. Thereby, the center part of the steel plate 10 is clamped by the lower die punch 21 and the pad 31, and is formed into an embossed shape.
The bottom surface of the end portion of the pad 31 is disposed so as to be positioned at the same height as the bottom surface of the scrap holder 32 described later during press molding.

  The scrap holder 32 is supported by the upper mold base 33. The scrap holder 32 holds the end portion of the steel plate 10 together with the scrap lifter 23. The lower surface of the scrap holder 32 is horizontal.

  An upper blade 321 corresponding to the trimming shape of the steel plate 10 is provided at the end of the scrap holder 32 at the boundary with the pad 31.

The elevating mechanism 34 moves the upper mold mechanism 30 up and down, thereby causing the upper mold mechanism 30 to approach and separate from the lower mold mechanism 20.
The elevating mechanism 34 includes a hydraulic cylinder (not shown) connected to the pin, a servo device (not shown) that drives the hydraulic cylinder, and a control device (not shown) that controls the servo device.

  FIG. 2A is a plan view of a molded article formed by the press-molding composite mold 1 according to the present embodiment. The steel plate 10 is cut into a product portion 101 and a scrap portion 102 along a trimming shape (cut portion 103).

  FIG. 2B is an end view taken along the line A-A ′ of the molded product shown in FIG. The product portion 101 of the steel plate 10 is gripped by the lower die punch 21, the movable die 22 and the pad 31, and the scrap portion 102 is gripped by the scrap lifter 23 and the scrap holder 32. In the steel plate 10, the cutting portion 103 is cut by the lower blade 221 and the upper blade 321.

  The operation of the press-molding composite mold 1 having the configuration shown in FIG. 1 will be described with reference to FIGS.

  First, FIG. 3A is a longitudinal sectional view showing an initial state of the press-molding composite mold 1. The steel plate 10 is set in the lower mold mechanism 20 in a state where the lifting mechanism 34 is driven and the upper mold mechanism 30 is raised to the top dead center. Specifically, the steel plate 10 is supported on the upper surface of the movable die 22 and the upper surface of the scrap lifter 23.

  Next, as shown in FIG. 3 (b), when the upper mold mechanism 30 is lowered, the lower surface of the end portion of the pad 31 and the lower surface of the scrap holder 32 come into contact with the upper surface of the steel plate 10. It is pressed down by the lower end surface and the scrap holder 32. That is, the steel plate 10 is sandwiched between the movable die 22, the scrap lifter 23, the pad 31 and the scrap holder 32.

  Subsequently, as shown in FIG. 3C, when the upper die mechanism 30 is lowered, the lower die punch 21 comes into contact with the lower surface of the central portion of the steel plate 10 and the steel plate 10 is pressed upward. Thereby, embossing is formed in the central part of the steel plate 10.

  Further, as shown in FIG. 3D, when the upper die mechanism 30 is lowered, the upper surface of the central portion of the lower die punch 21 reaches the lower surface of the central portion of the pad 31, and the press molding process ends. At this time, the movable die 22 reaches a flange provided around the lower portion of the lower die punch 21.

  Subsequently, trim processing is started. As shown in FIG. 4A, when the upper die mechanism 30 is further lowered, the movable die 22 and the pad 31 are prevented from being lowered by the flange provided around the lower portion of the lower die punch 21. Thus, the cushion 311 and the cushion pin 232 are compressed, and the scrap lifter 23 and the scrap holder 32 are lowered relative to the lower die punch 21, the movable die 22 and the pad 31. In this manner, the steel plate 10 is cut into a product portion and a scrap portion by the lower blade 221 and the upper blade 321 provided on the movable die 22 and the scrap holder 32, respectively.

  Next, as shown in FIG. 4B, until the product portion of the steel plate 10 and the cut portion of the scrap portion are substantially the same height, that is, the scrap lifter 23 and the scrap holder 32 before the steel plate 10 is cut. The upper mold mechanism 30 is raised to the height shown in FIG.

  Next, as shown in FIG. 4C, the upper die mechanism 30 and the lower die mechanism 20 are raised to separate the lower die punch 21 from the steel plate 10.

  Finally, as shown in FIG. 4 (d), the upper mold mechanism 30 is raised relative to the lower mold mechanism 20, and the pad 31 and the scrap holder 32 are separated from the movable die 22 and the scrap lifter 23. The pad 31 and the scrap holder 32 are raised to the top dead center. In this way, a product that has been press-molded and trimmed can be obtained.

Next, the effect when trim processing is performed by the press-molding composite mold 1 according to the present embodiment will be described in comparison with the case where trim processing is performed by the conventional trim mold.
FIG. 5 is an enlarged view of a portion to be trimmed in the cross section of the press-molding composite mold 1 according to the present embodiment. 5 (a) is in the stage of FIG. 3 (d), FIGS. 5 (b) and 5 (c) are in the stage of FIG. 4 (a), and FIG. 5 (d) is in the stage of FIG. 4 (b). Each corresponds.

  FIG. 5A shows a state before starting trimming. In the cross section of the press-molding composite mold 1 according to this embodiment, the end of the boundary between the pad 31 and the scrap holder 32 is a curve. This curve is provided in order to prevent the steel plate 10 from being caught on the pad 31 because the steel plate 10 is drawn between the pad 31 and the movable die 22 when the press molding is performed with the composite mold 1 for press molding. Yes.

  However, this curve has caused product deformation in conventional trim molds. That is, the space formed at the end of the boundary between the pad 31 and the scrap holder 32 makes the product side easier to deform than the scrap side. Therefore, as described above, in the composite mold 1 for press molding according to the present embodiment, the end of the boundary with the movable die 22 side of the scrap lifter 23 is inclined downward toward the movable die 22 side, A space formed by the inclination is used as a relief portion 231 for the scrap portion to be deformed downward. By deforming the scrap portion side of the steel plate 10 due to the presence of the escape portion 231, it is possible to suppress deformation on the product portion side.

  FIG. 5B shows a state immediately after the start of trim processing. Although the scrap lifter 23 and the scrap holder 32 are lowered relative to the movable die 22 and the pad 31, the cutting is not completed because sagging occurs at the cutting portion of the steel plate 10.

  FIG. 5C shows a state where the scrap lifter 23 and the scrap holder 32 are lowered to the bottom dead center, and the steel plate 10 is cut into a product portion and a scrap portion.

  FIG. 5D shows a state in which the product part of the steel plate and the cut part of the scrap part are returned to substantially the same height by raising the scrap lifter 23 and the scrap holder 32 relative to the movable die 22 and the pad 31. It is. Although the product part side and the scrap part side of the steel plate 10 interfere with each other due to burrs or the like generated during cutting, the scrap part is deformed in the direction of the relief part 231 provided on the movable die 22 side of the scrap lifter 23. Thus, deformation of the product part can be suppressed.

  On the other hand, FIG.6 and FIG.7 is the figure which expanded the site | part in which the trim processing is performed in the cross section of the conventional trim metal mold | die. The conventional trim mold is not provided with a relief portion for scraping the steel plate 60 after the steel plate 60 is cut down on the movable die 42 side of the scrap lifter 43.

FIG. 6A and FIG. 7A show a state before the start of trim processing.
FIG. 6B and FIG. 7B are immediately after the start of trim processing. Since the sagging occurs in the scrap lifter 43 and the scrap holder 52, the cutting is not completed. In FIG.7 (b), since the holding | grip part by the side of the scrap of the steel plate 60 is short, the scrap side is pulled by the product side.

FIGS. 6C and 7C show a state where the scrap lifter 43 and the scrap holder 52 are lowered to the bottom dead center. In FIG.6 (c), the steel plate 60 is cut | disconnected and the burr | flash has generate | occur | produced on both the product part side and scrap part side of the steel plate 60. FIG. In FIG. 7C, the scrap side is further pulled to the product side.
6 (d) and 7 (d), the scrap lifter 43 and the scrap holder 52 are moved up relative to the movable die 42 and the pad 51 so that the product portion of the steel plate and the cutting portion of the scrap portion are substantially the same. It is in the state returned to the height of.
In FIG.6 (d), the burr | flash of the product part side and scrap part side of the steel plate 60 which arose at the time of cutting interferes. As a result of burrs interfering with each other, the conventional trim mold is not provided with a relief part for deforming the scrap part downward in the scrap lifter unlike the press-molding composite mold 1 according to the present embodiment. Therefore, the product part side of the steel plate 60 is deformed.
In FIG.7 (d), the scrap side of the steel plate 60 has been drawn in to the product side. Due to this pull-in, in FIG. 7 (d), compared with FIG. 6 (d), the interference between the product portion side and the scrap portion side of the steel plate 60 is large, and the product portion side of the steel plate 60 is greatly deformed accordingly.

  The deformation of the product that occurs in the conventional trim mold is actually considered to be caused by a combination of the causes shown in FIGS.

  In the present embodiment, the present invention has been described by taking a press-molding composite mold as an example. However, the present invention is not limited to a press-molding composite mold, and is applicable to any trim mold having a scrap lifter. be able to.

  Further, the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  In the above embodiment, the end of the boundary between the scrap lifter 23 and the movable die 22 is inclined downward toward the movable die 22, and the space formed by the inclination is used as the escape portion 231. However, the shape of the slope for forming the relief portion is not limited. For example, as shown in FIG. 7A, the shape of the slope is curved in the cross section, the inclination angle is increased, or the distance between the scrap lifter 23 and the movable die 22 is increased as shown in FIG. 7B. The allowable amount of deformation of the scrap part may be increased.

  In the above embodiment, the gas cylinder is used as the cushion of the cushion 311 and the cushion pin 232, but a urethane cushion may be used.

1 ... Compound mold for press molding (mold)
10 ... Steel plate (molding material)
20 ... Lower die mechanism 21 ... Lower die punch 22 ... Movable die (lower die)
24 ... Lower mold base 23 ... Scrap lifter (lifter)
30 ... Upper mold mechanism 31 ... Pad (upper mold)
32 ... Scrap holder (holder)
33 ... Upper mold base 221 ... Lower blade 231 ... Relief 232 ... Cushion pin 311 ... Cushion 321 ... Upper blade

Claims (4)

A mold that can cut the molding material into a product part and a scrap part,
A lower mold in contact with the lower surface of the molding material on the product part side;
An upper mold that is in contact with the upper surface of the molding material on the product part side and sandwiches the product part side of the molding material together with the lower mold;
A holder that is in contact with the upper surface of the molding material on the scrap part side and that can be moved up and down relative to the upper mold along the side surface of the upper mold;
A lifter that is in contact with the lower surface of the molding material on the scrap portion side, sandwiches the scrap portion side of the molding material together with the holder, and can be moved up and down relative to the lower die along the side surface of the lower die; Have
A lower blade for cutting the molding material is provided at the end of the lower mold and the boundary with the lifter,
An upper blade for cutting the molding material is provided at an end of the boundary between the holder and the upper mold,
At the edge of the boundary between the lifter and the lower mold, the holder and the lifter are moved downward relative to the upper mold and the lower mold to cut the molding material, When the holder and the lifter are moved upward relative to the upper die and the lower die until the cut portions of the product portion and the scrap portion are substantially the same height, A die having a relief portion for being deformed downward when the cutting portion comes into contact with the cutting portion of the product portion.   The mold according to claim 1, wherein the relief portion is formed so as to be inclined downward toward the lower mold side. A trim processing method for cutting a molding material into a product part and a scrap part,
The product part side of the molding material is sandwiched between an upper mold that contacts the upper surface of the product part side and a lower mold that contacts the lower surface of the product part side, and the scrap part side of the molding material is placed on the scrap part side A clamping step of clamping with a holder in contact with the upper surface and a lifter in contact with the lower surface of the scrap part side;
The holder and the lifter are moved downward relative to the upper mold and the lower mold, and a lower blade provided at an end of a boundary between the lower mold and the lifter and the upper mold of the holder A cutting step of cutting the molding material into a product part and a scrap part by an upper blade provided at an end of the boundary with
The holder and the lifter are moved upward relative to the upper die and the lower die until the cut portions of the product portion and the scrap portion have substantially the same height, and the product portion and the scrap And a deformation step of deforming the cut portion of the scrap portion to the escape portion side provided at the end of the boundary with the lower mold of the scraper by contacting the cut portion of the portion. Trim processing method.   The trim processing method according to claim 3, wherein the relief portion is formed so as to be inclined downward toward the lower mold side.

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