Press molding apparatus and press molding method

Abstract

The present invention relates to a press forming device (10) and a press forming method. The press forming device performs press forming on a workpiece including a load control region (28) requiring application of a constant load, and has a die (14) having an upper die (18) and a lower die (16) that clamp the workpiece, a slide (20) that holds the upper die (18), a bolster (22) that holds the lower die, a pressurizing mechanism (24) that pressurizes the slide (20) toward the bolster (22) at a plurality of pressurizing points (26), and one or more support blocks (30) that are provided around the die (14) and are arranged between the bolster (22) and the slide (20), the support blocks (30) being arranged at positions outside the pressurizing points (26) and on lines extending from reference points at ends of the load control region (28) in the arrangement direction of the pressurizing points. According to this, a load can be applied with high accuracy to a prescribed portion in the die even in cases where the press device is different.

Description

Technical Field

[0001] This invention relates to a stamping forming apparatus and a stamping forming method. Background Technology

[0002] Stamping is a process in which a die is placed between the bolster and the slider of a stamping press, and the die clamps the workpiece and applies a load to it, thereby shaping the workpiece into a specified form. If the workpieces have the same shape, the same die shape is used in stamping presses used at multiple manufacturing locations. Summary of the Invention

[0003] Sometimes different stamping devices are used depending on the manufacturing location. However, sometimes the location of the pressure point that applies pressure to the die differs depending on the stamping device. This difference in the location of the pressure point will result in different amounts of die deflection. As a result, even when using the same die, the load distribution will change due to the stamping device, thus causing deviations in the molded product.

[0004] For example, sometimes a ridge with a small edge radius, known as a characterline, is formed on the outer panel of a car. When forming such a ridge with a small edge radius, a constant load needs to be applied to the entire ridge. If the load distribution changes due to different stamping devices, it becomes difficult to manufacture molded parts that require load control.

[0005] Therefore, a method is required that can apply loads with high precision to specified parts of the die, even when the stamping equipment is different.

[0006] The purpose of this invention is to solve the above-mentioned technical problems.

[0007] The following describes a stamping forming apparatus for stamping a workpiece including a load control area requiring a constant load. The apparatus includes a die, a slider, a pad, a pressing mechanism, and one or more support blocks. The die has an upper die and a lower die for clamping the workpiece; the slider holds the upper die; the pad holds the lower die; the pressing mechanism presses the slider against the pad at multiple pressing points; the one or more support blocks are disposed around the die and between the pad and the slider, the support blocks being positioned further outward than the pressing points and on a line extending from a reference point at the end of the load control area along the arrangement direction of the pressing points.

[0008] Another method discloses a stamping forming method that uses a stamping forming apparatus to stamp a workpiece including a load control area requiring a constant load. The stamping forming apparatus has a die, a slider, a pad, and a pressure mechanism. The die has an upper die and a lower die for holding the workpiece; the slider holds the upper die; the pad holds the lower die; and the pressure mechanism applies pressure to the slider against the pad at multiple pressure points. The stamping forming method includes the steps of: arranging one or more support blocks around the die and between the pad and the slider; and forming the workpiece by applying pressure to the support blocks and the die by the pressure mechanism. The step of arranging the support blocks includes the following steps: positioning the support blocks at a position outside the pressure points and on a line extending from a reference point at the end of the load control area along the arrangement direction of the pressure points.

[0009] The stamping apparatus and method described above, by configuring a minimal number of support blocks, can apply a uniform load with high precision to the load control area within the die, even when different stamping apparatuses are used. Therefore, the stamping apparatus and method described above can effectively form workpieces, including edges with small radii.

[0010] The above-mentioned objectives, features, and advantages can be readily understood from the following description of the embodiments with reference to the accompanying drawings. Attached Figure Description

[0011] Figure 1A This is a side view of the stamping apparatus according to the embodiment. Figure 1B It means Figure 1A A top view showing the configuration of the pad, lower die, and pressure points of the stamping forming device.

[0012] Figure 2 This is a flowchart illustrating the method for setting the support block according to the implementation method.

[0013] Figure 3A This is a top view showing the configuration relationship between the lower mold and the pressure point involved in the first example. Figure 3B This is a top view showing the configuration relationship between the lower mold and the pressure point involved in the second example.

[0014] Figure 4A It means and Figure 3B A top view of the basic configuration example of the first support block corresponding to the load control area in the second example. Figure 4B It means and Figure 4A The top view of the additional setting example of the support block corresponding to the second example.

[0015] Figure 5AThis is a top view showing an example of the configuration of the first and second support blocks corresponding to the load control area in the third example. Figure 5B It means and Figure 5A A top view of an example of an additional support block configuration.

[0016] Figure 6A This is a top view showing the configuration relationship between the lower mold and the pressure point involved in Example 4. Figure 6B This is a top view showing the configuration relationship between the lower mold and the pressure point involved in Example 5.

[0017] Figure 7A It means and Figure 6B The top view of the imaginary rectangle corresponding to the lower mold in example 5. Figure 7B This is a top view showing the configuration example of the auxiliary block corresponding to example 5.

[0018] Figure 8A This is a top view illustrating an example of an irregular configuration of the pressurization points in a stamping device. Figure 8B It means and Figure 8A A top view of an example setting of the hypothetical pressurization point corresponding to the pressurization point.

[0019] Figure 9 This is a flowchart illustrating the configuration process of the support block. Detailed Implementation

[0020] like Figure 1A As shown, the stamping forming apparatus 10 according to this embodiment includes a stamping device 12 and a die 14. The stamping device 12 includes a pad 22, a sliding member 20, and a plurality of pressing mechanisms 24, wherein the pad 22 supports the lower die 16 of the die 14; the sliding member 20 is disposed above the pad 22 and holds the upper die 18. The sliding member 20 is driven to rise and fall by the pressing mechanisms 24. The pressing mechanism 24 is, for example, a hydraulic cylinder. The pressing mechanism 24 applies a predetermined load to the die 14 by pressing the sliding member 20 against the pad 22. The die 14 has a lower die 16 held on the pad 22 and an upper die 18 held on the sliding member 20. The die 14 holds the workpiece as the object to be formed between the lower die 16 and the upper die 18. The stamping forming apparatus 10 forms the workpiece into a product shape by applying a predetermined load to the die 14 using the stamping device 12.

[0021] like Figure 1B As shown, in the stamping forming apparatus 10, the die 14 is disposed within the planar shape of the pad 22. In the illustrated example, the die 14 is shown as rectangular, but is not limited to this. For example, the die 14 used to form the outer panel of an automobile door has the planar shape of a door. Although not specifically illustrated, a guide mechanism is disposed around the die 14 to guide the movement of the die 14 and the slider 20.

[0022] The pressure points 26 are illustrated as the points where the pressure mechanism 24 applies pressure to the slider 20. In a typical stamping device 12, four pressure mechanisms 24 are provided. In this case, there are four pressure points 26. The pressure points 26 are located near the four corners of the rectangular slider 20 and are aligned along the short and long sides of the slider 20. Hereinafter, the long side direction of the slider 20 will be referred to as the X direction, the short side direction as the Y direction, and the vertical direction as the Z direction.

[0023] exist Figure 1B In this example, the pressure points 26 are positioned on the outer sides of the die 14 in both the X and Y directions. Therefore, the stamping device 12 causes the slider 20 and the die 14 to flex. Flexibility is the variation of the gap between the pad 22 and the slider 20 along the X and Y directions. The flexibility in the X direction, where the pressure points 26 are spaced further apart, is greater than the flexibility in the Y direction. Considering the flexibility in the X direction, it manifests as the following deformation: near the ends in the X direction, the distance between the pad 22 and the slider 20 is relatively narrower, while at the center side in the X direction, the distance between the slider 20 and the pad 22 is relatively larger. The die 14 also flexes and deforms along with the deformation of the pad 22 and the slider 20. As a result, it is difficult to apply a load near the center of the die 14 in the X direction, while a larger load is applied at both ends of the die 14 in the X direction.

[0024] Furthermore, when the stamping device 12 is changed, the position of the pressure point 26 changes, and therefore the way the flexure manifests also changes. Therefore, even when the stamping device 12 is changed, it is desirable to suppress the flexure of the load control area 28 in the die 14 where a uniform load is required.

[0025] Therefore, as Figure 1A As shown, the stamping forming apparatus 10 of this embodiment has a support block 30 disposed around the die 14. The support block 30 is disposed at a position outside the pressure point 26. The support block 30 is set considering the moment applied to the load control region 28 of the die 14. At least one support block 30 is disposed at a position that maintains the end of the load control region 28 in the X direction at the center position in the Y direction and moves in the X direction outside the pressure point 26, as will be described in detail later. To assist in setting the placement position of the support block 30, the stamping forming apparatus 10 may also have a computer 36. The computer 36 performs... Figure 2 The process shown calculates the appropriate placement of the support block 30. Furthermore, in Figure 1A In this embodiment, a support block 30 is provided in the lower mold 16, but this embodiment is not limited to this. For example, the support block 30 may be provided in the pad 22 instead of the lower mold 16.

[0026] The following describes the method for setting the support block 30.

[0027] First of all, Figure 2 In step S10, the computer 36 reads the position coordinates of the pressure point 26 of the stamping device 12, the shape data of the lower die 16, the shape data of the load control area 28, and the shape data of the pad 22.

[0028] In step S20, the computer 36 determines whether a support block 30 is needed. This determination is based on the position of the lower mold 16 of the mold 14 and the position of the pressure point 26. Deflection occurs centered on the center of the long side of the pressure point 26. Therefore, in this embodiment, a center line 52 in the X direction of the four pressure points 26 is defined, and the determination of whether a support block 30 is needed is performed for the regions located in the X1 direction and the regions located in the X2 direction relative to this center line 52. Furthermore, in the following description of the process, the region in the X1 direction will be explained as an example. The processing of the region in the X2 direction is basically the same as that in the X1 direction, except that it is symmetrical to the region in the X1 direction, so its explanation is omitted.

[0029] In the region along the X1 direction, if the pressure point 26 is located closer to the centerline than the end position of the lower die 16 in the X1 direction, the computer 36 determines that the support block 30 is not needed (step S20: NO). For example, in Figure 3A In the first example, the lower mold 16 extends to the outer side of the two pressure points 26 in the X1 direction. In this first example, the positions of the two pressure points 26 in the X direction are located inside the end of the lower mold 16 in the X1 direction (LX0 > L2). In this case, almost no deflection occurs in the slider 20 and the mold 14. Therefore, in Figure 3A In the event that the computer 36 determines that the support block 30 is not needed (step S20: NO) and ends the process.

[0030] Additionally, for example, in Figure 3B In the second case, the dimension of the lower die 16 in the X direction is smaller than that in the first case. The end of the lower die 16 in the X1 direction is located inside the pressure point 26 (LX0 < L2). Therefore, in Figure 3B In the second case, the computer 36 determines that support block 30 is needed (step S20: YES).

[0031] Step S20 is performed in the same way if the shape of the lower mold 16 is not rectangular. For example, Figure 6A and Figure 6BThe lower mold 16 in examples 4 and 5 shown has a boat-shaped design instead of a rectangle. In example 4, the end of the lower mold 16 in the X1 direction is located outside the pressure point 26 (LX0 > L2). Therefore, in... Figure 6A In the fourth case, since the pressure point 26 is located inside the end of the lower mold 16, the computer 36 determines that the support block 30 is not needed (step S20: NO) and ends the process.

[0032] in addition, Figure 6B The lower mold 16 in the fifth example shown has a boat-shaped design and is not rectangular. The end of the lower mold 16 in the X1 direction in the fifth example is located further inward than the pressure point 26 (LX0 < L2). Therefore, in Figure 6B In the fifth case, since the pressure point 26 is located on the outer side of the end of the lower mold 16, the computer 36 determines that the support block 30 is needed (step S20: YES).

[0033] In step S20, if the computer 36 determines that it is YES, the process moves to step S30.

[0034] In step S30, the computer 36 determines whether the shape of the lower mold 16 is rectangular. If the lower mold 16 is not rectangular (step S30: NO), the process proceeds to step S40. If the lower mold 16 is rectangular (step S30: YES), the process proceeds to step S50.

[0035] For example, Figures 3A to 5B The shape of the lower mold 16 shown in (Examples 1 to 3) is rectangular. Therefore, for the cases of Examples 1 to 3, the computer 36 determines that it is a rectangle (step S30: YES). If the computer 36 determines that it is YES in step S30, the process proceeds to step S50.

[0036] In addition, for example, Figure 6B (Example 5) The shape of the lower mold 16 shown is not rectangular. Therefore, for Example 5, the computer 36 determines that it is not rectangular (step S30: NO). When the computer 36 determines NO in step S30, the process proceeds to... Figure 2 Step S40.

[0037] exist Figure 2 In step S40, the computer 36 performs setting processing for the auxiliary block 38. The auxiliary block 38 is a support component positioned near the lower mold 16. The auxiliary block 38 adjusts the load distribution around the non-rectangular lower mold 16, thereby treating the lower mold 16 as a rectangle. For example, in Figure 7AIn the fifth case, the lower mold 16 has a shape formed by cutting off a corner of a rectangle. In this case, the computer 36 draws two orthogonal imaginary lines 42a and 42b, which are formed by extending the two sides adjacent to the notched portion 40, and finds the intersection of the imaginary lines 42a and 42b as the corner 46 of the imaginary rectangle 44. Then, as... Figure 7B As shown, the computer 36 sets an auxiliary block 38 at the corner 46. The lower mold 16 with the auxiliary block 38 has the same load distribution as the lower mold 16 with the shape of an imaginary rectangle, so it can be processed as a rectangular lower mold 16. Then, as a lower mold 16 with an imaginary rectangle 44, the process moves to step S50.

[0038] In step S50, the computer 36 configures the support block 30. Step S50 involves the computer 36 determining the configuration position of the support block 30, which is a position capable of suppressing load deviation in the load control region 28. First, in Figure 9 In step S500, computer 36 calculates the load f1 applied to the load control region 28. The load f1 is determined by the ideal surface pressure σh (kgf / mm²) when a load is applied to the workpiece. 2 It is calculated by multiplying the area S of the load control region 28 by the product of the area S.

[0039] For example, in Figure 4A In the second example shown, the load control region 28 is a rectangular shape with dimensions D1 in the X direction and D2 in the Y direction. Therefore, the load of the load control region 28 in the second example is calculated by f1 = σh × D1 × D2.

[0040] Next, in Figure 9 In step S502, the computer 36 sets a first reference point 48 and a second reference point 50. When the load control region 28 extends across the centerline 52 in the X direction of the slider 20, the first reference point 48 is determined as the center in the Y direction of the portion of the load control region 28 that is separated from the centerline 52. Alternatively, when the load control region 28 does not extend across the centerline 52, the first reference point 48 is set at the end of the load control region 28 closest to the centerline 52. The first reference point 48 is the part of the load control region 28 furthest from the pressure point 26 in the X direction in the X direction, and is the part that bears the maximum torque from the pressure point 26. The second reference point 50 is determined as the center in the Y direction of the end of the outer side (the side furthest from the centerline 52) of the load control region 28.

[0041] Next, the process proceeds to step S504. In step S504, the computer 36 performs basic settings for the support block 30. In step S504, the computer 36 assumes that the Y-direction positions of the first reference point 48 and the second reference point 50 are the same (refer to...). Figure 4A Only the first support block 32 is determined. Additionally, when the computer 36 has different Y-direction positions at the first reference point 48 and the second reference point 50 (refer to...), Figure 5A Determine the configuration positions of the first support block 32 and the second support block 34.

[0042] The first support block 32 is positioned on a straight line extending along the X direction from the first reference point 48. That is, the first support block 32 is positioned at the same location as the first reference point 48 in the Y direction. Furthermore, the X-direction position of the first support block 32 is configured to balance the torque M1 of the pressure point 26 relative to the first reference point 48. The torque M1 is the torque acting on the first reference point 48 centered on the axis in the Y direction connecting the two pressure points 26. The first support block 32 is configured to satisfy the condition that the torque M1 is zero.

[0043] That is, let the load from the pressure point 26 be F, and the load applied to the first support block 32 be f. Furthermore, let the distance in the X direction between the pressure point 26 and the first reference point 48 be L2, and the distance between the first support block 32 and the first reference point 48 be LX1. Also, let the load applied to the load control area 28 be f1, and let the angle between the centerline of the load control area 28 and the X direction be θ. In this case, the moment M1 of the first reference point 48 is expressed by the following formula.

[0044] M1=2F×L2-(f1×L2×cosθ)-(f×LX1) To suppress deflection, the torque M1 acting on the first reference point 48 only needs to be 0. Therefore, by setting the left side of the above formula to 0, LX1 is solved, thereby determining the position of the first support block 32.

[0045] exist Figure 4A In the second example shown, if the angle θ between the centerline of the load control area 28 and the X direction is 0°, then cosθ is 1. As a result, the first support block 32 is positioned as shown in the figure. Furthermore, in Figure 5A In the third example shown, the first support block 32 is positioned as illustrated.

[0046] If the position of the second reference point 50 in the Y direction differs from the position of the first reference point 48 in the Y direction, the computer 36 also determines the configuration position of the second support block 34. The position of the second support block 34 is determined based on the positions of the second reference point 50 and the first support block 32. Specifically, the configuration position of the second support block 34 is determined by the intersection of a straight line extending in the X direction through the second reference point 50 and a straight line extending in the Y direction through the first support block 32.

[0047] Next, the process proceeds to step S506. In step S506, the computer 36 verifies the support block 30 determined in step S504. The computer 36 calculates the ultimate fracture bearing capacity fa, which is obtained by multiplying the cross-sectional area Sa of the support block 30 by the tensile strength σa of the material. Furthermore, if the load f applied to the first support block 32 (and the second support block 34) exceeds the ultimate fracture bearing capacity fa, since the strength would be insufficient if only the first support block 32 (and the second support block 34) are provided, the process proceeds to step S508 to provide an additional support block 30.

[0048] Additionally, in step S506, the computer 36 determines whether the placement position of the support block 30, determined in step S504, exceeds the end of the pad 22 in the X direction. If the placement position of the support block exceeds the end of the pad 22 in the X direction, the torque cannot be counteracted by the first support block 32 (and the second support block 34) alone. Therefore, the process proceeds to step S508 to set an additional support block 30.

[0049] On the other hand, in step S506, if the computer 36 determines that the first support block 32 (and the second support block 34) meet the above conditions (step S506: YES), the process ends.

[0050] In step S508, the computer 36 sets the additional support block 30. For example... Figure 5B As shown, the computer 36 calculates an additional setting line 56 extending in the X direction through the pressure point 26. Next, the computer 36 sets additional support blocks 30 at the intersections of the line extending in the Y direction through the first reference point 48 and the additional setting line 56, the line extending in the Y direction through the second reference point 50 and the additional setting line 56, and the line extending in the Y direction through the first support block 32 and the additional setting line 56. In this case, to achieve torque balance relative to the axis in the X direction through the first reference point 48, support blocks 30 are added on both sides (Y1 direction and Y2 direction) of the load control region 28 in the Y direction. That is, the computer 36 calculates the additional setting line 56 at each of the two pressure points 26 separated in the Y direction and sets the support block 30 along each additional setting line 56.

[0051] Then, the position of the support block 30 is determined again to balance the torques Mx and My acting on the first reference point 48. For example, in Figure 4B In the second case, the position of the support block 30 is determined based on the condition that the following formula is satisfied.

[0052] Mx=2F×L2-f1×L2-f×(3LX1+2L2)=0 My=LY2×(F+3f)-LY3×(F+3f)=0 2×L1=LY2+LY3 Here, LX2 is the distance in the X direction between the first reference point 48 and the second reference point 50. LY2 is the distance in the Y direction between the first reference point 48 and the additional setting line 56 in the Y1 direction, and LY3 is the distance in the Y direction between the first reference point 48 and the additional setting line 56 in the Y2 direction. L1 is half the Y-direction dimension of the rectangular area.

[0053] Additionally, for example, in Figure 5B In the third case, the position of the support block 30 is determined based on the condition that the following formula is satisfied.

[0054] Mx=2F×L2-f1×L2×cosθ-f×(4LX1+2L2)=0 My=LY2×(F×4f)+f1×L2-LY3×(F+3f)=0 2×L1=LY2+LY3

[0055] The result of step S508 is that, Figure 4B In the second case, a first support block 32 and six additional support blocks 30 are provided. Additionally, in Figure 5B In the third case, a first support block 32, a second support block 34, and six additional support blocks 30 are provided.

[0056] The setting process for support block 30 is now complete after following the steps above.

[0057] Then, in the stamping forming apparatus 10, a first support block 32 is arranged between the sliding member 20 and the pad 22, and a second support block 34 and additional support blocks 30 are arranged as needed to perform stamping forming of the workpiece using the die 14. The stamping forming method using the stamping forming apparatus 10 of this embodiment can suppress the deflection of the load control region 28 and apply a uniform load to the load control region 28.

[0058] (Modifications of the implementation method) In the above examples, the pressing device 12 was described with the pressing point 26 located at the corner of a rectangular area, but this embodiment is not limited to this. For example, as Figure 8A As shown, in the case of irregular configuration of pressurization point 26, such as Figure 8B As shown, by setting four hypothetical pressurization points P4, it is possible to perform... Figure 2 Setting process of support block 30 (step S50).

[0059] The following is based on Figure 8AFor example, the method for setting the hypothetical pressure point P4 when the configuration of the pressure point 26 is irregular will be explained. Furthermore, in the following description, the portion from the center of the stamping device 12 in the X direction toward the X1 direction is shown, and the portion in the X2 direction is the same as it except for left-right symmetry.

[0060] In the illustrated example, the region in the X1 direction includes three pressure points P1, P2, and P3. In this modified example, two hypothetical pressure points P4 are defined based on the loads at the three pressure points P1, P2, and P3. Here, the loads at pressure points P1, P2, and P3 are respectively set as Fp1, Fp2, and Fp3. The loads Fp1, Fp2, and Fp3 are added together and then divided by 2 to obtain the load Fp4 at the hypothetical pressure point.

[0061] Fp4 = (Fp1 + Fp2 + Fp3) / 2

[0062] Next, based on the torque with reference to the center line 52 in the X direction and the center line 54 in the Y direction of the slider 20, the distances from each pressure point P1, P2, P3 to the center line 52 in the X direction of the slider 20 in the X direction are set as Lpx1, Lpx2, and Lpx3, respectively. The distance Lpx4 from the hypothetical pressure point P4 to the center line 52 in the X direction is calculated by the following formula.

[0063] Lpx4=(Fp1×Lpx1+Fp2×Lpx2+Fp3×Lpx3) / 2×Fp4

[0064] Furthermore, the distances in the Y direction between each pressure point P1, P2, P3 and the center line 54 of the slider 20 are respectively designated as Lpy1, Lpy2, and Lpy3. The distance Lpy4 between the hypothetical pressure point P4 and the center line 54 in the Y direction is calculated using the following formula.

[0065] Lpy4=(Fp1×Lpy1+Fp2×Lpy2+Fp3×Lpy3) / 2×Fp4 like Figure 8B As shown, the hypothetical pressure point P4 is set at the positions away from Lpy4 in the Y1 direction from the center line 54 in the Y direction and away from Lpy4 in the Y2 direction.

[0066] By using the hypothetical pressure point P4 set as described above, it is possible to... Figure 2 The processing setting support block 30 is shown.

[0067] The inventions mentioned above can be summarized as follows.

[0068] One embodiment is a stamping forming apparatus 10 for stamping a workpiece including a load control region 28 to which a constant load is required. The apparatus includes a die 14, a slider 20, a pad 22, a pressing mechanism 24, and one or more support blocks 30. The die has an upper die 18 and a lower die 16 for clamping the workpiece; the slider holds the upper die; the pad holds the lower die; the pressing mechanism presses the slider against the pad at multiple pressing points 26; the one or more support blocks are disposed around the die and between the pad and the slider, the support blocks being positioned outside the pressing points and on a line extending from a reference point at the end of the load control region along the direction of the arrangement of the pressing points.

[0069] According to the stamping apparatus described above, since it can suppress the deflection of the load control area and apply a uniform load to the load control area, the processing accuracy of the load control area can be improved. Therefore, the stamping apparatus described above can form molded articles that require a uniform load to be applied to the ridges and other parts constituting the feature lines with high precision.

[0070] In the aforementioned stamping forming apparatus, the pressure points are arranged at the four corners of a rectangular area, and at least one support block is positioned on a line extending from a first reference point 48 along the length direction of the rectangular area. The first reference point is located at the point where it intersects the center line of the rectangular area along its length direction within the load control area, or at the end of the load control area closest to the center line. This stamping forming apparatus minimizes the number of support blocks, thus simplifying the apparatus structure and reducing preparation time.

[0071] In the above-described stamping apparatus, the load control area may extend along the length direction, and the support block may have a first support block 32, which is disposed on a line extending along the length direction from the first reference point. This stamping apparatus can minimize the number of support blocks and reduce the preparation time of the apparatus.

[0072] In the above-described stamping apparatus, the load control region extends obliquely relative to the length direction, and the support block has a first support block and a second support block. The first support block is disposed on a line extending from a first reference point along the length direction; the second support block is disposed on a line extending from a second reference point along the length direction, the second reference point being set at the end of the load control region furthest from the center line. This stamping apparatus can apply a uniform load to the load control region even when the load control region is oblique.

[0073] In the aforementioned stamping forming apparatus, additional support blocks may be provided along a line extending from the first reference point along the width direction of the rectangular region, along a line extending from the second reference point (located at the end furthest from the center line in the load control region) along the width direction, and along a line extending from the first support block along the width direction. This stamping forming apparatus can prevent breakage of the support blocks by distributing the load using multiple support blocks, and reliably prevents deflection of the load control region, thereby enabling the application of a uniform load to the load control region.

[0074] In the above-described stamping apparatus, the lower die may have a non-rectangular shape formed by cutting off a portion of a rectangle, and an auxiliary block 38 may be provided at the corner 46 of an imaginary rectangle that supplements the cut-off portion of the lower die. This stamping apparatus can process non-rectangular lower dies in the same way as rectangular lower dies, thereby facilitating the placement of support blocks.

[0075] Another approach is a stamping forming method, which involves stamping a workpiece including a load control area requiring a constant load using a stamping forming apparatus. The stamping forming apparatus has a die, a slider, a pad, and a pressure mechanism 24. The die has an upper die and a lower die for holding the workpiece; the slider holds the upper die; the pad holds the lower die; and the pressure mechanism applies pressure to the slider against the pad at multiple pressure points. The stamping forming method includes: a step (S50) of arranging one or more support blocks around the die and between the pad and the slider; and a step of forming the workpiece by applying pressure to the support blocks and the die using the pressure mechanism 24. The step of arranging the support blocks includes the following steps: positioning the support blocks at a position outside the pressure points and on a line extending from a reference point at the end of the load control area along the arrangement direction of the pressure points.

[0076] In the above-described stamping method, the pressure points are arranged at the four corners of the rectangular area, and at least one of the support blocks is configured on a line extending from the first reference point along the length direction of the rectangular area, wherein the first reference point is set at the location in the load control area where it intersects with the center line of the length direction of the rectangular area or at the end of the load control area closest to the center line.

[0077] In the above-described stamping method, the load control area may extend along the length direction, and the support block may have a first support block, which is disposed on a line extending from the first reference point along the length direction.

[0078] In the above-described stamping method, the load control region may extend obliquely relative to the length direction, and the support block may have a first support block and a second support block, wherein the first support block is disposed on a line extending from the first reference point along the length direction; and the second support block is disposed on a line extending from the second reference point along the length direction, the second reference point being set at the end of the load control region furthest from the center line.

[0079] In the above-described stamping method, the additional support block can be positioned on a line extending from the first reference point along the width direction of the rectangular region, on a line extending from the second reference point located at the end furthest from the center line in the load control region along the width direction, and on a line extending from the first support block along the width direction.

[0080] In the above-described stamping method, the lower die may have a non-rectangular shape formed by cutting off a portion of a rectangle, and auxiliary blocks may be configured at the corners of an imaginary rectangle that supplements the cut-off portion of the lower die.

[0081] Furthermore, the present invention is not limited to the above description, and various structures can be adopted without departing from the spirit of the present invention.

Claims

1. A stamping forming apparatus (10) for stamping a workpiece including a load control region (28) requiring a constant load to be applied, characterized in that, It has a mold (14), a sliding member (20), a pad (22), a pressing mechanism (24), and one or more support blocks (30), wherein, The mold has an upper mold (18) and a lower mold (16) for clamping the workpiece. The slider holds the upper mold; The pad holds the lower mold; The pressurizing mechanism applies pressure to the sliding member and the pad at multiple pressurizing points (26); The one or more support blocks are disposed around the mold and between the pad and the slider. The support block is positioned further outward than the pressure point and is located on a line extending from a reference point at the end of the load control area along the arrangement direction of the pressure points. The pressurization points are arranged at the four corners of the rectangular area. At least one of the support blocks is disposed on a line extending along the length direction of the rectangular region from a first reference point (48), the first reference point being set at a location in the load control region where it intersects with the center line of the length direction of the rectangular region or at the end of the load control region closest to the center line.

2. The stamping forming apparatus according to claim 1, characterized in that, The load control region extends along the length direction. The support block has a first support block (32) which is disposed on a line extending from the first reference point along the length direction.

3. The stamping forming apparatus according to claim 1, characterized in that, The load control region extends obliquely relative to the length direction. The support block has a first support block and a second support block (34), wherein, The first support block is positioned on a line extending from the first reference point along the length direction; The second support block is positioned on a line extending along the length direction from the second reference point (50), which is located at the end of the load control area furthest from the center line.

4. The stamping forming apparatus according to claim 2 or 3, characterized in that, Further additional support blocks are provided on a line extending from the first reference point along the width direction of the rectangular region, on a line extending from the second reference point, which is set in the load control region at the end furthest from the center line, along the width direction, and on a line extending from the first support block along the width direction.

5. The stamping forming apparatus according to any one of claims 1 to 3, characterized in that, The lower mold has a non-rectangular shape created by cutting off a portion of a rectangle. An auxiliary block (38) is placed at the corner (46) of an imaginary rectangle that supplements the portion cut off from the lower mold.

6. A stamping forming method, comprising stamping a workpiece including a load control area requiring a constant load using a stamping forming apparatus, said stamping forming apparatus having a die, a sliding member, a pad, and a pressure mechanism, wherein, The mold has an upper mold and a lower mold for clamping workpieces; a sliding member holds the upper mold; a pad holds the lower mold; and a pressurizing mechanism applies pressure to the sliding member and the pad at multiple pressurizing points, characterized in that... have: The step of arranging one or more support blocks around the mold and between the pad and the slider; and The step of forming the workpiece by applying pressure to the support block and the mold through the pressurizing mechanism. The step of configuring the support block includes the following steps: positioning the support block at a position further outward than the pressure point, and positioning it on a line extending from a reference point at the end of the load control area along the arrangement direction of the pressure points. The pressurization points are arranged at the four corners of the rectangular area. At least one of the support blocks is disposed on a line extending along the length direction of the rectangular region from a first reference point, the first reference point being set at a location in the load control region where it intersects the center line of the rectangular region along the length direction or at the end of the load control region closest to the center line.

7. The stamping forming method according to claim 6, characterized in that, The load control region extends along the length direction. The support block has a first support block, which is disposed on a line extending from the first reference point along the length direction.

8. The stamping forming method according to claim 6, characterized in that, The load control region extends obliquely relative to the length direction. The support block has a first support block and a second support block, wherein, The first support block is positioned on a line extending from the first reference point along the length direction; The second support block is positioned on a line extending along the length direction from the second reference point, which is located at the end of the load control area furthest from the center line.

9. The stamping method according to claim 7 or 8, characterized in that, The additional support blocks are positioned on a line extending from the first reference point along the width direction of the rectangular region, on a line extending from the second reference point, which is located at the end furthest from the center line in the load control region, along the width direction, and on a line extending from the first support block along the width direction.

10. The stamping method according to any one of claims 6 to 8, characterized in that, The lower mold has a non-rectangular shape created by cutting off a portion of a rectangle. Auxiliary blocks are placed at the corners of an imaginary rectangle that supplements the portion cut off from the lower mold.

Images