Mold device and method of operation of a mold device

Abstract

The present invention is to suppress the generation of wrinkles and to easily perform trimming processing based on a punch and an upper die, thereby suppressing the generation of chips and burrs, on the basis of a fine blanking method. The die device has an upper die, a lower die, a backing plate whose upper portion is connected to the upper die, a punch which is placed on the lower die and whose upper surface opposes the lower surface of the backing plate, a blank holder whose upper surface opposes the lower surface of the upper die, and a movable punch which is connected to the lower die via a pressure source, whose upper surface opposes the lower surface of the upper die, and which corresponds to a remaining material shape portion, and which performs the fine blanking method using the movable punch and the upper die by sandwiching and restraining a material between the upper die and the blank holder.

Description

Technical Field

[0001] This invention relates to a mold device and a method for operating the mold device. Background Technology

[0002] In recent years, trimming or bending processes of materials using mold devices have been carried out. Patent Document 1 discloses a composite mold device that can continuously perform trimming and bending processes in the same process.

[0003] Patent Document 1: Japanese Patent Application Publication No. 01-022421 Summary of the Invention

[0004] In the composite mold device described in Patent Document 1, instead of using a fixed main punch and main mold that are advantageous for cross-sectional rigidity, a movable punch and movable mold that are disadvantageous for cross-sectional rigidity are used for trimming. Therefore, the punching clearance is difficult to manage, which is the reason why chips and burrs are easily generated during trimming.

[0005] Therefore, the negative pressure during panel conveying will cause the chips to be placed on the surface of the punch. If deep drawing is performed under this condition, it may lead to poor quality of the panel, such as unevenness.

[0006] Figure 2 This is a structural example of a die device with a related precision blanking structure. Specifically, the die device includes: an upper die 101 having an upper die extension 101a extending downward and having a trimming blade at its lower end; a lower die 102; a backing plate 103 having a clearance for trimming blade avoidance; a punch 104 having a shape in which a portion of its upper surface is recessed downward and having a trimming blade; a backing plate pressure source 105; and a blank holder 106, the upper surface of which is opposite to the lower surface of the upper die 101.

[0007] like Figure 2 As shown, when the blanking ring 106 has a blank shape set, the blank shape is set in the blanking surface which should be flat, resulting in undulations. Therefore, when the blank is used as a blank in the early stage of deep drawing, blank wrinkles are generated, making it difficult to perform deep drawing.

[0008] The present invention provides a mold device and a method for operating the mold device, which, based on the precision blanking process, suppresses the generation of wrinkles and facilitates trimming based on the punch and upper die, thereby suppressing the generation of chips and burrs.

[0009] The present invention relates to a mold apparatus comprising: an upper mold; a lower mold; a backing plate, the upper part of which is connected to the upper mold; a punch mounted on the lower mold, the upper surface of which faces the lower surface of the backing plate; a blank holder, the upper surface of which faces the lower surface of the upper mold; and a movable punch connected to the lower mold via a pressure source, the upper surface of which faces the lower surface of the upper mold and corresponds to the shape portion of the excess material. The movable punch and the upper mold are used to perform a precision blanking process by clamping the material between the upper mold and the blank holder.

[0010] Therefore, regarding the shape of the excess material, by using a movable punch to cut it off from the blank holder surface, wrinkles in this part can be prevented, thus making it easy to perform trimming processing using a movable punch and an upper die.

[0011] Furthermore, the present invention relates to a method for operating a mold device, the mold device comprising: an upper mold; a lower mold; a backing plate, the upper part of which is connected to the upper mold; a punch mounted on the lower mold, the upper surface of which faces the lower surface of the backing plate; a blank holder, the upper surface of which faces the lower surface of the upper mold; and a movable punch connected to the lower mold via a pressure source, the upper surface of which faces the lower surface of the upper mold and corresponds to the shape portion of the excess material. The method for operating the mold device includes the following steps: constraining the material by clamping it between the upper mold and the blank holder; and performing a precision blanking process using the movable punch and the upper mold.

[0012] Therefore, regarding the shape of the excess material, by using a movable punch to cut it off from the blank holder surface, wrinkles in this part can be prevented, thus making it easy to perform trimming processing using a movable punch and an upper die.

[0013] Invention Effects

[0014] According to the present invention, a mold device and a method of operating the mold device are provided, which, based on the use of a precision blanking process, suppresses the generation of wrinkles and facilitates trimming based on the punch and upper die, thereby suppressing the generation of chips and burrs. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the mold apparatus according to Embodiment 1.

[0016] Figure 2 This is a cross-sectional view of the relevant mold assembly. Detailed Implementation

[0017] Implementation Method 1

[0018] Hereinafter, the mold apparatus 1 according to this embodiment will be described with reference to the accompanying drawings.

[0019] Figure 1 This is a cross-sectional view of the die assembly 1 as seen from the side, showing the state after the deep drawing process is completed and just before the trimming process begins. The die assembly 1 includes: an upper die 11; a lower die 12; a backing plate 13, the upper end of which is connected to the lower surface of the upper die 11; a punch 14, which is mounted on the lower die 12; a first pressure source 15, which is disposed between the upper die 11 and the backing plate 13, with its upper end connected to the upper die 11 and its lower end connected to the backing plate 13; a blank holder 16, the lower end of which is connected to the lower die 12; a movable punch 17; and a second pressure source 18.

[0020] In the following description, for ease of explanation, according to Figure 1 The description is based on the viewpoint in the specified direction, where the pad 13 and punch 14 are on the left, and the pressure ring 16 or the upper die 11 with the upper die extension 22 extending in the vertical direction is arranged on the right.

[0021] The upper mold 11 has: an upper mold-shaped portion 21, which is disposed on the left side and is thin in the vertical direction; and an upper mold extension portion 22, which is disposed on the right side and extends elongated in the vertical direction. Furthermore, the upper mold 11 is fixed to a device (not shown). Although described in detail later, the upper mold 11 can be lowered by power from the device.

[0022] The lower surface of the upper template-shaped portion 21 is connected to the pad 13 via a telescopic portion that can extend and retract freely in the vertical direction. Furthermore, a first pressure source 15 is provided between the upper template-shaped portion 21 and the pad 13 to apply operating pressure to the pad 13.

[0023] The lower surface 22a of the upper die extension 22 faces the upper surface 16a of the pressure ring 16. The lower surface 22a of the upper die extension 22 and the upper surface 16a of the pressure ring 16 form a pressing surface for pressing the material. In addition, a portion of the lower surface 22a of the upper die extension 22 has a downwardly protruding protrusion 22b that is inserted into a recess 16b provided on the upper surface of the pressure ring 16.

[0024] Furthermore, the lower surface 22a of the upper die extension 22 is opposite to the upper surface 17a of the movable punch 17 disposed below the upper die extension 22 and between the pressure ring 16 and the punch 14.

[0025] Furthermore, on the surface of the upper mold extension 22 opposite to the pad 13, i.e. Figure 1 On the left side of the middle part, a trimming portion 22c protruding to the left is formed slightly upward from the lower left corner, close to the pad 13 and the punch 14. A trimming blade is provided on the trimming portion 22c.

[0026] The lower mold 12 is typically mounted on and fixed in a device. The lower mold 12 has: a plate-shaped lower mold plate portion 31, which is formed to be thin in the vertical direction; a first lower mold extension portion 32, which is shaped to extend upward further than the lower mold plate portion 31; and a second lower mold extension portion 33, which is formed between the lower mold plate portion 31 and the first lower mold extension portion 32, and is formed to be shorter in the vertical direction than the first lower mold extension portion 32.

[0027] The lower template-shaped part 31 is provided in Figure 1 It is positioned on the right side of the middle section and below the pressure ring 16. The lower end of the pressure ring 16 is connected to the lower template-shaped portion 31.

[0028] like Figure 1 As shown on the left, a punch 14 is mounted above the first lower die extension 32. That is, the lower surface of the punch 14 is in contact with the upper surface of the first lower die extension 32.

[0029] A movable punch 17 is connected to the second lower die extension 33 via the second pressure source 18.

[0030] The material is drawn by combining the backing plate 13 and the punch 14. More specifically, the lower surface 13a of the backing plate 13 faces the upper surface 14a of the punch 14, and the backing plate is lowered to perform the drawing process while material is placed between these two surfaces. Here, as Figure 1 As shown, the boundary between the lower surface 13a of the pad 13 and the upper surface 14a of the punch 14 is higher on the left side, away from the upper die extension 22 or the pressure ring 16, and lower on the right side, closer to the upper die extension 22 or the pressure ring 16.

[0031] In addition, such as Figure 1 As shown, the pad 13 can be configured to have a shape that protrudes to the right slightly upward from the lower right corner near the upper mold extension 22 or the pressure ring 16.

[0032] The punch 14 is positioned below the lower surface 13a of the pad 13, and is used in conjunction with the pad 13 to perform deep drawing of the material. Figure 1 As shown, the punch 14 has a trimming portion 14b protruding to the right slightly below the upper right corner of the upper die extension 22 or the movable punch 17. A trimming blade is provided on this trimming portion 14b.

[0033] The first pressure source 15 is a device capable of generating a force that causes the pad 13 to move downward. Thus, in the mold assembly 1, a deep drawing process can be performed by moving the pad 13 downward while the upper mold 11 and the lower mold 12 are fixed.

[0034] In addition, the first pressure source 15 is capable of elongation and contraction in the vertical direction. Typically, the elongation or contraction of the first pressure source 15 is synchronized with the telescopic portion connected to the upper template-like portion 21 and the pad 13.

[0035] The pressure ring 16 is disposed below the upper die extension 22 of the upper die 11. Furthermore, when pressed downwards by the upper die extension 22, the pressure ring 16 is connected to the lower die template 31 of the lower die 12 in a downward-moving state. Thus, when the upper die extension 22 moves downwards, the pressure ring 16 is positioned such that the lower surface 22a of the upper die extension 22 and the pressure surface formed by the upper surface 16a of the pressure ring 16 move downwards.

[0036] Therefore, when the upper die extension 22 is performing trimming, it can press the pressure ring 16 while descending. At this time, the boundary between the lower surface 22a of the upper die extension 22 and the upper surface 17a of the movable punch 17 also moves downward.

[0037] The movable punch 17 is positioned above the second lower die extension 33. Alternatively, a portion of the movable punch 17 can also be mounted above the first lower die extension 32.

[0038] The upper surface 17a of the movable punch 17 faces the lower surface 22a of the upper die extension 22 for precision punching. Furthermore, the upper surface 17a of the movable punch 17 is positioned higher than the punch 14 side and lower than the pressure ring 16 side. In other words, the boundary between the upper surface 17a of the movable punch 17 and the lower surface 22a of the upper die extension 22 is higher than... Figure 1 The left side of the punch 14 is higher than the right side of the pressure ring 16.

[0039] In addition, such as Figure 1 As shown, the movable punch 17 can be configured to have a shape that protrudes to the left slightly below the upper left corner of the pad 13 or punch 14.

[0040] The second pressure source 18 supplies a force that causes the movable punch 17 to move up and down. Typically, the lower end of the second pressure source 18 is connected to the upper surface of the second lower die extension 33 of the lower die 12. And the upper end of the second pressure source 18 is connected to the lower end of the movable punch 17.

[0041] Next, the actions of deep drawing of the material through the mold device 1 and the trimming process after deep drawing will be explained.

[0042] First, the operation during the deep drawing process of the material will be explained. The die device 1 constrains the material between the lower surface 22a of the upper die extension 22 of the upper die 11 and the upper surface 16a of the blank holder 16 by lowering the upper die 11.

[0043] The first pressure source 15 generates a force that causes the pad 13 to descend. As a result, a deep drawing process is performed between the lower surface 13a of the pad 13 and the upper surface 14a of the punch 14.

[0044] The second pressure source 18 generates a force that causes the movable punch 17 to rise. As a result, the material is clamped between the upper surface 17a of the movable punch 17 and a portion of the lower surface of the upper die extension 22 of the upper die 11, which is opposite to the upper surface 17a, and the remaining material is drawn.

[0045] Furthermore, at this time, the right end of the boundary between the lower surface 13a of the pad 13 and the upper surface 14a of the punch 14, and the left end of the boundary between the lower surface 22a of the upper die extension 22 and the upper surface 17a of the movable punch 17, are at the same height. In other words, at the end of the deep drawing process, the parts of these two boundary portions that are close to each other are at the same height.

[0046] Next, the trimming process after the deep drawing process will be explained.

[0047] After the deep drawing process is completed, the upper die 11 clamps the material between the lower surface 13a and the upper surface 14a of the punch 14, and performs a descent action while the material is constrained between the lower surface 22a of the upper die extension 22 of the upper die 11 and the upper surface 16a of the pressure ring 16 and between the lower surface 22a of the upper die extension 22 and the upper surface 17a of the movable punch 17.

[0048] Here, the upper die 11 descends, and the upper die plate 21 descends as well, but the pad 13 cannot descend because it comes into contact with the punch 14 via the material. Therefore, the downward force applied to the pad 13 by the descending action of the upper die 11 is absorbed by the contraction of the first pressure source 15 and the telescopic part connected to the upper die 11 and the pad 13.

[0049] On the other hand, the upper die extension 22 is in a state where it presses the pressure ring 16 downward while descending. That is, the pressure ring 16 descends according to the downward direction of the upper die 11.

[0050] Furthermore, the upper die extension 22 is positioned to lower the movable punch 17 while pressing it downwards. Here, the movable punch 17 is supported in a state where it can descend a predetermined distance by retracting the second pressure source 18. Therefore, the movable punch 17 descends while retracting the second pressure source 18.

[0051] Therefore, the position of the boundary between the lower surface 22a of the upper die extension 22 and the upper surface 17a of the movable punch 17 is lowered.

[0052] As a result, the trimming portion 22c of the upper die extension 22 is exposed, and the trimming blade of the trimming portion 14b of the punch 14 is exposed, so as to perform trimming processing on the material.

[0053] Based on the above, in the die assembly 1, by aligning the portion that becomes the blank shape with the movable punch 17, that portion can be cut away from the blank holder surface. Therefore, in the die assembly 1, a precision blanking process based on the movable punch and the upper die can be achieved without producing blank wrinkles.

[0054] The trimming process can also be performed using the upper die 11, lower die 12, and punch 14, which are fixed to the equipment and do not move, thus providing a rigid cutting advantage. Therefore, in the die assembly 1, the blanking clearance is easy to manage, and the generation of chips or burrs during the trimming process can be minimized.

[0055] Furthermore, the present invention is not limited to the above-described embodiments, and appropriate modifications can be made without departing from the spirit of the invention. That is, for the sake of clarity, the above description has been appropriately omitted and simplified, and those skilled in the art can easily modify, add to, or transform the various elements of the embodiments within the scope of the present invention.

[0056] Symbol Explanation

[0057] 1-Mold assembly, 11-Upper mold, 12-Lower mold, 13-Backing plate, 13a-Lower surface, 14-Punch, 14a-Upper surface, 14b-Trimming part, 15-First pressure source, 16-Pressure ring, 16a-Upper surface, 16b-Recess, 17-Modible punch, 17a-Upper surface, 18-Second pressure source, 21-Upper template-shaped part, 22-Upper mold extension, 22a-Lower surface, 22b-Protrusion, 22c-Trimming part, 31-Lower template-shaped part, 32-First lower mold extension, 33-Second lower mold extension.

Claims

1. A mold-making device, characterized in that, have: upper mold; Lower mold; A pad, the upper part of which is connected to the upper mold; A punch is placed on the lower die, with its upper surface facing the lower surface of the pad. The pressure ring has its upper surface opposite to the lower surface of the upper die; and A movable punch is connected to the lower die via a pressure source, its upper surface facing the lower surface of the upper die and corresponding to the shape of the remaining material. Material is constrained by clamping it between the upper die and the pressure ring. Precision blanking is performed using the movable punch and the upper die.

2. The mold device according to claim 1, characterized in that, The movable punch is supported in the following state: When the upper mold descends, the pressure source can contract to allow it to descend a specified distance. Trimming is performed using trimming blades located on the upper die and on the punch.

3. A method for operating a mold device, the mold device comprising: an upper mold; Lower mold; A pad, the upper part of which is connected to the upper mold; A punch is placed on the lower die, with its upper surface facing the lower surface of the pad. A pressure ring, the upper surface of which is opposite to the lower surface of the upper die; and A movable punch is connected to the lower die via a pressure source, with its upper surface facing the lower surface of the upper die and corresponding to the shape of the remaining material. The method for operating the mold device is characterized by including the following steps: Constraint is achieved by clamping material between the upper mold and the pressure ring; Precision blanking is performed using the movable punch and the upper die.

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