JP2023064671A - Press component assembling method and press component integrated molding - Google Patents

Abstract

To provide an integrated molding of a press component that sufficiently realizes a reduction in manufacturing costs, in cases when multiple kinds of press components to be assembled to one assembly object are box-packed into component boxes and transported to an assembly line.SOLUTION: According to a press component integrated molding 10, a first press component 14, a second press component 16, and a third press component 18 of multiple kinds to be assembled to one assembly object are coupled in a mutually splittable manner. Therefore, when the first press component 14, the second press component 16, and the third press component 18 are assembled to one assembly object, the multiple kinds of press components are sorted and box-packed into component boxes per kind, and since work of selecting and transporting the component boxes according to the kinds of assembly objects, a reduction in manufacturing costs can be sufficiently realized.SELECTED DRAWING: Figure 1

Description

The present invention provides an integrally molded product of a plurality of types of pressed parts, a method of assembling a plurality of types of pressed parts, and a method of The present invention relates to a method for forming press parts.

In the assembly factory, multiple types of press parts to be assembled into one assembly object are packed into parts boxes that contain the press parts, one for each type, and stored in the parts warehouse. are transported from the warehouse to the assembly line. In the assembly line, a large number of parts boxes are arranged, and the assembly worker selectively takes out the press parts to be assembled on the assembly object from the plurality of parts boxes and assembles them on the assembly object.

For example, as shown in Patent Document 1, a parts box contains one type of parts, and the same number of parts boxes as the number of types of press parts to be assembled to an object to be assembled are arranged on an assembly line. be. Further, when a plurality of types of assembly objects with different press parts to be assembled flow through the assembly line, the number of types of component boxes arranged on the assembly line increases.

Japanese Utility Model Laid-Open No. 7-023734

By the way, in order to reduce the manufacturing cost, it is possible to press-mold the plurality of types of press parts with a common mold at once, and separate the press parts during press working. When the pressed parts are sorted and packed in a parts box for each type, the number of parts boxes increases and the man-hours for sorting, packing, and transporting parts increase, and the manufacturing cost cannot be sufficiently reduced. had the drawback of

SUMMARY OF THE INVENTION The present invention has been made against the background of the above circumstances, and its object is to pack a plurality of types of press parts to be assembled into one assembly object in a parts box and transport them to an assembly line. It is an object of the present invention to provide a method for assembling pressed parts and an integrally molded product of pressed parts that can sufficiently reduce costs.

As a result of various investigations against the background of the above circumstances, the inventors of the present invention have found that a common metal can be used to form a composite pressed part in which a plurality of types of pressed parts to be assembled to one assembly object are connected to each other in a dividable manner. Press molding using a mold reduces the number of parts boxes for packing each composite pressed part and reduces the man-hours for sorting and packing, thereby enhancing the effect of reducing the manufacturing cost of the object to be assembled. The present invention has been made based on such findings.

That is, the gist of the first invention is (a) a press part assembling method for assembling a plurality of types of press parts to one assembly object, and (b) a plurality of press parts to be assembled to the one assembly object. (c) a press molding step of press-molding some or all of the types of press parts using a common mold so as to form a press-part integrally-molded product that is detachably connected to each other; (d) a press part conveying step of conveying a parts box packed with integrally molded parts to an assembly site of the assembly target; and (d) separating the pressed parts from the integrally molded parts packed in the parts box. , and an assembling step of assembling to the object to be assembled.

The gist of the second invention is that in the first invention, the press molding step is performed in a predetermined assembly order for some or all of the plurality of types of press parts to be assembled to the one assembly object. The integrally molded product of pressed parts connected in the above manner is press-molded.

The gist of the third invention is that in the first invention or the second invention, the pressed parts constituting the integrally molded pressed part are connected via a V-shaped notch, and in the assembling step, a pre-bending operation for applying a bending stress to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch; A pair of press parts sandwiching the V-shaped notch is separated by a separating bending operation that causes plastic deformation in the bottom wall of the V-shaped notch to break it.

The gist of the fourth invention is that in any one of the first to third inventions, the integrally molded product of the press part is made of an aluminum alloy, and the remaining thickness of the V-shaped notch is Δt, A ratio of the thickness t of the integrally molded product to the residual thickness Δt of the V-shaped notch is 0.4 or less, where t is the thickness of the integrally molded product.

The gist of the fifth invention is that in any one of the first invention to the third invention, the integrally formed press part is made of a cold-rolled steel plate, and the remaining thickness of the V-shaped notch is When Δt is the plate thickness of the integrally molded product of the press parts, the ratio of the remaining thickness Δt of the V-shaped notch to the thickness t of the integrally molded product of the press parts is 0.2 or less. be.

The gist of the sixth invention is a press part integrally molded product used in an assembling method for assembling a plurality of types of pressed parts to one assembly object, wherein the plurality of types of pressed parts to be assembled to the one assembly object are connected in a mutually divisible manner.

The gist of the seventh invention resides in that in the sixth invention, the press part integrally molded product is such that the plurality of types of press parts are connected in a predetermined assembly order.

The gist of the eighth invention is that in the sixth invention or the seventh invention, the pressed parts constituting the integrally molded pressed part are connected by a V-shaped notch, and the bending stress is applied to the V-shaped notch. and a pre-bending operation to generate plastic deformation in the bottom wall of the V-shaped notch by applying a bending stress to the V-shaped notch in a direction opposite to the pre-bending operation to the bottom wall of the V-shaped notch. A pair of press parts sandwiching the V-shaped notch is separated by a separation bending operation for causing plastic deformation and breaking the parts.

The gist of the ninth invention is that in any one of the sixth to eighth inventions, the integrally molded product of the press part is made of an aluminum alloy, and the remaining thickness of the V-shaped notch is Δt, Assuming that the plate thickness of the integrally-formed pressed part is t, the ratio (Δt/t) between the residual thickness Δt of the V-shaped notch and the plate thickness t of the integrally-formed pressed part is 0.4 or less. There is something.

The gist of the tenth invention is that in any one of the sixth to eighth inventions, the integrally formed press part is made of a cold-rolled steel plate, and the remaining thickness of the V-shaped notch is When Δt is the plate thickness of the press part integrally molded product, the ratio (Δt/t) between the residual thickness Δt of the V-shaped notch and the plate thickness t of the press part integrally molded product is 0.2. It consists in the following.

According to the press part assembling method of the first invention, in the press molding step, some or all of the plurality of types of press parts to be assembled to the one assembly object are mutually divisible and connected to each other. Press molding is performed using a common mold so as to form an integrally molded product, and in a press parts conveying process, a parts box in which the integrally molded pressed parts are packed is conveyed to an assembly location for the assembly object, and assembled. In the attaching step, the pressed parts are separated from the integrally molded pressed parts packed in the parts box, and assembled to the object to be assembled. As a result, there is no need to separate multiple types of press parts, pack each type into a parts box, and select a parts box according to the type of the object to be assembled and transport it, thereby sufficiently reducing the manufacturing cost. can be realized.

According to the press part assembling method of the second invention, the press part integrally molded product press-molded in the press molding step is a part or all of the plurality of types of press parts to be assembled to the one assembly object. are connected in a predetermined assembly order. As a result, it is possible to assemble the press-formed parts to the object to be assembled in the order in which they are separated from the integrally-formed pressed parts. Even if there are similar shapes, incorrect assembly is prevented.

According to the method of assembling pressed parts of the third invention, the plurality of types of pressed parts constituting the integrally molded product of pressed parts are connected via V-shaped notches for generating stress concentration, and the assembly is In the additional step, a pre-bending operation in which a bending load is applied to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a writing in the V-shaped notch in the opposite direction to the pre-bending operation. A separation bending operation of applying a bending load smaller than that of the pre-bending operation to break the bottom wall of the V-shaped notch separates the pair of press parts sandwiching the V-shaped notch. As a result, the press part can be separated from the press part integrally molded product by a simple operation, so that the efficiency of the work of assembling the press part to the assembly object can be improved.

According to the method of assembling the pressed parts of the fourth invention, the integrally molded product of the pressed parts is made of an aluminum alloy, the residual thickness of the V-shaped notch is Δt, and the thickness of the integrally molded pressed parts is t. , the ratio (Δt/t) between the residual thickness Δt of the V-shaped notch and the plate thickness t of the integrally molded press part is 0.4 or less. Thereby, a pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a pre-bending operation in which the V-shaped notch is subjected to the pre-bending operation in the opposite direction to the pre-bending operation. A separation bending operation of applying a bending load smaller than that of the bending operation to break the bottom wall of the V-shaped notch allows the pressed part to be separated from the integrally molded product of the pressed part with a simple operation. The efficiency of the work of assembling the is enhanced.

According to the press part assembling method of the fifth invention, the integrally formed press part is made of a cold-rolled steel plate, the remaining thickness of the V-shaped notch is Δt, and the plate thickness of the integrally formed press part is is t, the ratio of the remaining thickness Δt of the V-shaped notch to the plate thickness t of the integrally molded press part is 0.2 or less. Thereby, a pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a pre-bending operation in which the V-shaped notch is subjected to the pre-bending operation in the opposite direction to the pre-bending operation. A separation bending operation of applying a bending load smaller than that of the bending operation to break the bottom wall of the V-shaped notch allows the pressed part to be separated from the integrally molded product of the pressed part with a simple operation. The efficiency of the work of assembling the is enhanced.

According to the pressed part integrally molded product of the sixth invention, since some or all of the plurality of types of pressed parts to be assembled to one assembly object are connected to each other so as to be dividable, the plurality of types of pressed parts When assembling to one object to be assembled, there is no need to separate multiple types of press parts, pack each type in a parts box, select a parts box according to the type of the object to be assembled, and transport it. , the reduction of the manufacturing cost can be fully realized.

According to the pressed part integrally molded product of the seventh aspect of the invention, the pressed part integrally molded product is such that the plurality of types of pressed parts are connected in a predetermined assembly order. As a result, when assembling a plurality of types of press parts to one assembly object, the press-formed products can be assembled to the assembly object in the order in which they are separated from the integrally-formed press-parts, which increases the efficiency of the assembly work. In addition, even if some of the plurality of types of pressed parts have similar shapes to each other, erroneous assembly can be prevented.

According to the pressed part integrally molded product of the eighth invention, the plurality of types of pressed parts constituting the pressed part integrally molded product are connected by a V-shaped notch for stress concentration generation, and the V-shaped notch and applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and applying a smaller bending load to the V-shaped notch in a direction opposite to the pre-bending operation. A pair of press parts sandwiching the V-shaped notch are separated by a separating bending operation for breaking the bottom wall of the V-shaped notch. As a result, the press part can be separated from the press part integrally molded product by a simple operation, so that the efficiency of the work of assembling the press part to the assembly object can be improved.

According to the integrally formed pressed part product of the ninth invention, the integrally formed pressed part product is made of an aluminum alloy, the remaining thickness of the V-shaped notch is Δt, and the plate thickness of the integrally formed pressed part is t. Then, the ratio (Δt/t) between the residual thickness Δt of the V-shaped notch and the plate thickness t of the integrally molded press part is 0.4 or less. As a result, a pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a pre-bending operation in which the V-shaped notch is subjected to the pre-bending operation in the opposite direction to the pre-bending operation. A separation bending operation of applying a bending load smaller than that of the bending operation to break the bottom wall of the V-shaped notch allows the pressed part to be separated from the integrally molded product of the pressed part with a simple operation. The efficiency of the work of assembling the is enhanced.

According to the integrally formed pressed part product of the tenth invention, the integrally formed pressed part product is made of a cold-rolled steel plate, the remaining thickness of the V-shaped notch is Δt, and the plate thickness of the integrally formed pressed part is A ratio (Δt/t) between the residual thickness Δt of the V-shaped notch and the plate thickness t of the integrally molded press part is 0.2 or less. As a result, a pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a pre-bending operation in which the V-shaped notch is subjected to the pre-bending operation in the opposite direction to the pre-bending operation. A separation bending operation of applying a bending load smaller than that of the bending operation to break the bottom wall of the V-shaped notch allows the pressed part to be separated from the integrally molded product of the pressed part with a simple operation. The efficiency of the work of assembling the is enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an integrally molded pressed part in which a plurality of types of pressed parts are connected, which is an embodiment of the present invention; FIG. 2 is a cross-sectional view for explaining a V-shaped notch provided between a first pressed part and a second pressed part of the integrally molded pressed part of FIG. 1; 1. It is process drawing explaining the process from manufacture to an assembly|attachment of the press part integrally molded product of FIG. FIG. 2 is a perspective view showing a state in which a first pressed part is separated from the integrally molded pressed part of FIG. 1; FIG. 5 is a perspective view showing a state in which a second pressed part is separated from the integrally molded pressed part of FIG. 4; FIG. 10 is a stress-strain curve illustrating the stress behavior in the bottom wall of the V-notch; FIG. 10 shows the stress behavior in the bottom wall of the V-shaped notch after press forming of the V-shaped notch. Fig. 10 shows the stress behavior in the bottom wall of the V-notch after pre-bending about the groove bottom wall of the V-notch; Fig. 10 shows the stress behavior in the bottom wall of the V-notch after a separate bend in the opposite direction to the pre-bend about the groove bottom wall of the V-notch; FIG. 4 is a diagram illustrating a bending angle β between a first pressed part and a second pressed part around a V-shaped notch; It is a figure explaining the bending state of the specimen in a four-point bending test. FIG. 4 is a diagram illustrating the relationship between Δt/t obtained from test products A1 to A16 and S1 to S16 and the working ratio PR and working ratio PD; FIG. 3 is a diagram showing the relationship between the opening angle α of the V-shaped notch, the maximum bending load (N), and the cross-sectional area of the notch (mm ² ) in a test piece made of cold-rolled steel plate SPCC. FIG. 4 is a diagram showing the relationship between the opening angle α of the V-shaped notch, the maximum bending load (N), and the notch cross-sectional area (mm ² ) in a test piece made of aluminum alloy material A6000. FIG. 2 is a diagram showing the relationship between the plate thickness t, the maximum bending load (N), and the notch cross-sectional area (mm ² ) in a test piece made of cold-rolled steel plate SPCC. FIG. 3 is a diagram showing the relationship between the plate thickness t, the maximum bending load (N), and the notch cross-sectional area (mm ² ) in a test piece made of aluminum alloy material A6000. FIG. 3 is a diagram showing the relationship between Δt/t, maximum bending load (N), and notch cross-sectional area (mm ² ) in a test piece made of cold-rolled steel plate SPCC. FIG. 3 is a diagram showing the relationship between Δt/t, maximum bending load (N), and notch cross-sectional area (mm ² ) in a test piece made of aluminum alloy material A6000. FIG. 4 is a diagram showing the relationship between the working rate PR and the maximum bending load (N) in a test piece made of aluminum alloy material A6000. FIG. 4 is a diagram showing the relationship between the reduction ratio PR and the maximum bending load (N) in a test piece made of cold-rolled steel plate SPCC. FIG. 4 is a diagram showing the relationship between residual thickness Δt and maximum bending load (N) in a test piece made of aluminum alloy material A6000. FIG. 3 is a diagram showing the relationship between residual thickness Δt and maximum bending load (N) in a test piece made of cold-rolled steel plate SPCC. It is a figure which shows the change of the Vickers hardness of test-pieces A9, A16, S10, and S12 near the fracture surface. FIG. 10 is a cross-sectional view illustrating another aspect of the V-shaped notch;

In the present invention, the integrally molded product of pressed parts is a metal product that is plastically worked into a thin metal plate using a press die. The press part integrally molded product is preferably a common press part integrally molded product so that some or all of the plurality of types of press parts to be assembled into one assembly object are mutually dividably connected to each other. is press-molded at once using a mold of

In the present invention, an integrally molded product of pressed parts is formed by connecting a plurality of types of pressed parts in a predetermined order for assembly into one object to be assembled. The plurality of types of pressed parts have different shapes, but parts with similar shapes may also be included.

In the present invention, a plurality of types of pressed parts constituting the integrally molded pressed part may be connected via one V-shaped notch, or may be connected by two or more V-shaped notches provided on a straight line. may be linked. Also, the pressed part integrally molded product and the plurality of pressed parts constituting it may not necessarily have a longitudinal shape, and the plurality of pressed parts may be connected in the width direction.

In the present invention, the plurality of types of pressed parts constituting the integrally molded product of pressed parts may be all or part of the plurality of types of pressed parts to be assembled to one assembly object.

In the present invention, the plurality of types of pressed parts constituting the integrally molded pressed part may be two or may be four or more.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following examples, the drawings are appropriately simplified or modified for the sake of explanation, and the dimensional ratios, shapes, etc. of each part are not necessarily drawn accurately.

FIG. 1 is a perspective view showing an integrally molded pressed part 10 which is one embodiment of the present invention. The press part integrally molded product 10 has a longitudinal shape, and is composed of a plurality of press parts connected in the longitudinal direction via V-shaped notches 12, three first press parts 14 and a second press part in this embodiment. It consists of a part 16 and a third pressed part 18 .

The first press part 14, the second press part 16, and the third press part 18 have, for example, lengths 14l, 16l, 18l, cutouts 14c, 16c, 18c, and mounting holes 14h, 16h, 18h. They have dimensions and formation positions, and are connected in a predetermined assembly order for sequential assembly to one assembly object (not shown). That is, the first press part 14 is attached to the object to be assembled, then the second press part 16 is attached, and then the third press part 18 is attached. A press part 14, a second press part 16 and a third press part 18 are longitudinally connected.

For example, the object to be assembled is a vehicle door, and the first press part 14, the second press part 16, and the third press part 18 are sequentially assembled and fixed inside the vehicle door.

The V-shaped notch 12 is formed between the first pressed part 14 and the first pressed part 14 so that the parts can be divided by a simple bending operation, for example, a reciprocating operation of a pre-bending operation described later and a separation bending operation in the opposite direction of the pre-bending operation. They are provided in the same shape between the second press part 16 and between the second press part 16 and the third press part 18, respectively. The V-shaped notch 12 is a groove having a V-shaped cross section formed during press forming, and as shown in FIG. has an opening angle α, a residual thickness Δt, and a depth d. The remaining thickness Δt is the widthwise center thickness of the groove bottom wall 20 of the V-shaped notch 12 , that is, the minimum thickness. A broken line in FIG. 2 indicates a fractured portion (fractured surface) to be divided at the center of the width direction of the groove bottom wall 20 .

FIG. 3 shows a process chart from manufacture to assembly of the integrally molded press part 10. As shown in FIG. In FIG. 3, in a pressing process P1, an integrally molded pressed part 10 is integrally molded by pressing using a press die. In the packing process P2, the press-molded integrally molded product 10 is packed in a component box. Only the integrally molded pressed part 10 is accommodated in this parts box. In the transport process P3, the parts box is transported to a predetermined assembly work place on the assembly line via a parts warehouse as necessary. In the assembling process P4, first, as shown in FIG. 4, the first pressed part 14 at one end of the integrally molded product 10 taken out of the parts box is divided by the assembling operator. is assembled to the assembly object. Next, as shown in FIG. 5, the second pressed part 16 is separated from the third pressed part 18 by an assembly worker, and the second pressed part 16 is assembled to the assembly object. Then, the third press part 18 is assembled to the assembly object. In such assembly work, after the first pressed part 14 is assembled, the remaining second pressed part 16 and third pressed part 18 may be separated from the assembled first pressed part 14. , after the second pressed part 16 is assembled, the remaining third pressed part 18 may be separated from the assembled second pressed part 16 . In this case, it can be separated with one hand, so workability is further enhanced.

The brittle splitting mechanism of the V-shaped notch 12 formed in the integrally molded pressed part 10 will be described below. First, when the metal plate material is compressed in the process of forming the V-shaped notch 12 in the pressing process P1, work hardening occurs in the groove bottom wall 20 of the V-shaped notch 12 due to plastic strain due to stress concentration. Occur. This work hardening makes the grain boundaries of the metal more likely to fracture, increasing the susceptibility to brittle fracture. Then, the groove bottom wall 20 of the V-shaped notch 12 is further work-hardened by the pre-bending, and in the subsequent separation bending in the direction opposite to the pre-bending, the groove bottom of the V-shaped notch 12 is bent with a small bending load due to the Bauschinger effect. Wall 20 is easily split.

In general, when a metal is plastically deformed, dislocations move inside, and the dislocations accumulate at grain boundaries to form a stress field, which acts to impede the movement of subsequent dislocations, resulting in work hardening. is said to be a cause of In addition, when a stress exceeding the elastic limit is applied to an object to cause permanent deformation, and then a stress in the opposite direction is applied, the elastic limit becomes very small. This is called the Bauschinger effect.

FIG. 6 is a stress-strain curve illustrating work hardening of the groove bottom wall 20 of the V-notch 12 and the Bauschinger effect. The stress σ on the negative side indicates compression, and the stress σ on the positive side indicates tension. In FIG. 6, when the stress σ in the compression direction is applied up to the maximum stress −σb in the process of press-molding the V-shaped notch 12 by press-molding, the yield stress −σa is reached as shown from point 0 to point a. When the stress σ in the compressive direction exceeds the yield stress −σa, the groove bottom wall 20 plastically deforms as shown from point a to point b until the maximum stress in the compressive direction −σb. work hardening occurs. When the stress σ is returned to zero from the maximum stress -σb, the strain ε recovers slightly as shown from point b to point c. In this state of point c, the integrally molded pressed part 10 is conveyed to the assembly process P4. After that, when the stress σ in the tensile direction is applied by the pre-bending operation, the yield stress σd at that time becomes a value smaller by the amount σ1 (= σb - σa) that the yield stress in compression increases. It becomes plastic deformation. As a result, the larger the working ratio (plastic strain) in the initial compressive direction, the lower the yield stress σd in the opposite tensile direction. That is, the Bauschinger effect increases.

7 to 9 show the stress behavior in the groove bottom wall 20 during pressing, pre-bending and separation bending, for example in the V-shaped notch 12 between the first stamping part 14 and the second stamping part 16. The states are shown respectively. After press-molding the V-shaped notch 12 in the integrally molded product 10, it is in the state of point d in FIG. A compressive stress CS in the direction toward 20 remains.

Next, as shown in FIG. 10, the angle between the first press part 14 and the second press part 16 around the groove bottom wall 20 of the V-shaped notch 12 is , the bending angle β reaches, for example, 90 degrees in the direction M1 indicated by the white arrow. The tensile stress DS in the direction away from the groove bottom wall 20 of the V-shaped notch 12 acts outside the neutral line of the groove bottom wall 20, i. are also formed on the outside. In FIG. 8 , the two-dot chain line indicates the neutral line in the thickness direction of the groove wall 20 .

Then, the separation bending operation of the first press part 14 and the second press part 16 centering on the groove bottom wall 20 of the V-shaped notch 12 is performed on the press part integrally molded product 10 after the pre-bending operation. When the bending is performed in the direction M2 indicated by the open arrow, that is, in the opposite direction to the pre-bending, the tensile stress DS is applied to the outside of the neutral line of the groove bottom wall 20, ie, the V-shaped notch, as indicated by the dashed arrow in FIG. 12 and a crack C2 is formed outside the neutral line of the groove bottom wall 20 . As a result, the already formed crack C1 is connected to the new crack C2, and the pressed parts 14 and 16 are separated.

The present inventors have found that the factors of the V-shaped notch 12, the opening angle α (°), the remaining thickness Δt (mm), the plate thickness t (mm), the remaining thickness Δt and the plate thickness of the integrally molded product of the press part A test to examine the influence of the ratio value of t (Δt/t) on the operating load of the splitting operation was conducted according to the experimental plan shown in Table 1, using cold-rolled steel plate SPCC specimens S1 to S16 in Table 2 and , and test pieces A1 to A16 made of aluminum alloy material A6000 in Table 3 were prepared, and the maximum bending load was measured. Each specimen is a longitudinal plate specimen of 150 mm length by 20 mm width.

(Table 1)
A6000 SPCC
Opening angle α Sheet thickness t Δt/t Δt/t
75 1 0.20 0.10
90 1.2 0.30 0.15
105 1.6 0.40 0.20
120 2 0.50 0.25

(Table 2) Cold-rolled steel plate SPCC
Test product number Opening angle α Sheet thickness t Δt/t
S1 75 1.0 0.1
S2 75 1.2 0.15
S3 75 1.6 0.2
S4 75 2.0 0.25
S5 90 1.0 0.15
S6 90 1.2 0.1
S7 90 1.6 0.25
S8 90 2.0 0.2
S9 105 1.0 0.2
S10 105 1.2 0.25
S11 105 1.6 0.1
S12 105 2.0 0.15
S13 120 1.0 0.25
S14 120 1.2 0.2
S15 120 1.6 0.15
S16 120 2.0 0.1

(Table 3) Aluminum alloy material A6000
Test product number Opening angle α Plate thickness t Δt/t
A1 75 1.0 0.2
A2 75 1.2 0.3
A3 75 1.6 0.4
A4 75 2.0 0.5
A5 90 1.0 0.3
A6 90 1.2 0.2
A7 90 1.6 0.5
A8 90 2.0 0.4
A9 105 1.0 0.4
A10 105 1.2 0.5
A11 105 1.6 0.2
A12 105 2.0 0.3
A13 120 1.0 0.5
A14 120 1.2 0.4
A15 120 1.6 0.3
A16 120 2.0 0.2

(Method for measuring maximum bending load)
Speed: 10mm/min
Outer (lower) side fulcrum distance L1: 72 mm
Inner (upper) side fulcrum distance L2: 24 mm
4-point bending tester: INSTRON5582 (LoadCell 1kN)
The relationship between each factor of the V-shaped notch and the maximum bending load is examined by measuring the four-point bending FS diagram obtained from the testing machine. FIG. 11 shows the 4-point bending test condition of each specimen.

The ratio of the cross-sectional area reduced by working to the original cross-sectional area is defined as working rate PR (= (1-Δt/t) / 2 × 100), and the thickness t is added to clarify the degree of work hardening. 12 is obtained as the relationship between Δt/t, the working ratio PR, and the working ratio PD. As is clear from FIG. 12, the working ratio PR is determined by Δt/t, but even if the working ratio PR is the same, the larger the plate thickness t, the larger the working ratio PD.

FIG. 13 shows the effect of the opening angle α of the V-shaped notch on the maximum bending load (N) in the test piece made of cold-rolled steel plate SPCC. Further, FIG. 14 shows the influence of the opening angle α of the V-shaped notch on the maximum bending load (N) in the test piece made of aluminum alloy material A6000. As is clear from FIGS. 13 and 14, when the remaining thickness Δt and the plate thickness t are constant, the degree of workability PD increases as the opening angle α increases, so the maximum bending load tends to decrease.

FIG. 15 shows the influence of the plate thickness t on the maximum bending load (N) in test pieces made of cold-rolled steel plate SPCC. Moreover, FIG. 16 shows the influence of the plate thickness t on the maximum bending load (N) in the test piece made of aluminum alloy material A6000. As is clear from FIGS. 15 and 16, when the opening angle α of the V-shaped notch and Δt/t are constant, both the remaining thickness Δt and the cross-sectional area of the V-shaped notch increase as the plate thickness t increases. However, since the remaining thickness Δt has a greater influence on the bending load, the maximum bending load tends to increase.

FIG. 17 shows the effect of Δt/t on the maximum bending load (N) in test pieces made of cold-rolled steel plate SPCC. Also, FIG. 18 shows the effect of Δt/t on the maximum bending load (N) in the test piece made of aluminum alloy material A6000. As is clear from FIGS. 17 and 18, when the opening angle α of the V-shaped notch and the plate thickness t are constant, an increase in Δt/t tends to increase the maximum bending load.

FIG. 19 shows the effect of the working ratio PR on the maximum bending load (N) in the test piece made of aluminum alloy material A6000. Moreover, FIG. 20 shows the influence of the reduction rate PR on the maximum bending load (N) in the test piece made of the cold-rolled steel plate SPCC. As is clear from FIGS. 17 and 18, the bending load (N) decreases as the processing rate PR increases. When the processing rate PR is the same, the smaller the plate thickness t, the smaller the residual thickness Δt, so the maximum bending load (N) becomes smaller.

FIG. 21 shows the influence of residual thickness Δt on the maximum bending load (N) in test pieces made of aluminum alloy material A6000. Moreover, FIG. 22 shows the influence of the remaining thickness Δt on the maximum bending load (N) in the test piece made of the cold-rolled steel plate SPCC. As is clear from FIGS. 21 and 22, the maximum bending load (N) increases as the remaining thickness Δt increases. Regarding the bending load, the effect of Δt/t is the largest, followed by the plate thickness t.

Next, the present inventors used the following test methods to investigate the effects of the degree of workability PD and workability PR on the maximum bending load (N), using the test samples A9, A16, S10, The hardness of S12 was measured.
(Hardness measurement method)
Micro Vickers hardness tester: FM300 manufactured by Future Tech Co., Ltd.
Test load: 100gf
Load holding time: 10 seconds

(Table 4) Test product details
Test product A9 A16 S10 S12
Opening angle α (°) 105 120 105 105
Thickness t (mm) 1.0 2.0 1.2 2.0
Remaining thickness Δt (mm) 0.4 0.4 0.3 0.3
Processing rate PR (%) 30 40 37.5 37.5
Workability PD 0.3 0.8 0.45 0.85
Maximum bending load (N) 31.71 27.40 71.00 57.30

(Table 5) Hardness measurement results
Test product A9 A16 S10 S12
Distance from fracture surface 0.1 mm 129.2 134.7 230.5 232.9
0.3 mm 120.4 129.2 205.9 237.8
0.5mm 117.5 132.6 215.5 223.6
0.7mm 100.2 129.2 192.5 216.9
0.9mm 95.4 136.6 181.6 224.3
1.5mm 80.9 124.7 122.5 188.4
2.0 mm 83.6 109.3 109.3 142.0
3.0mm - 86.4 - 129.6

FIG. 23 is a diagram showing changes in Vickers hardness in the vicinity of the fracture surface, which is a graph of Table 5. FIG. As shown in FIG. 23, both the aluminum alloy material A6000 test piece and the cold-rolled steel plate SPCC test piece exhibit higher Vickers hardness values as the workability PD increases. Further, when the residual thickness Δt is the same, the maximum bending load is smaller for the one with the higher workability PD.

(bending test)
Next, the inventors of the present invention used each of the test products A1 to A16 and S1 to S16 to perform a pre-bending operation with a bending angle β of 90, and the groove bottom wall 20 of the V-shaped notch 12 The occurrence of cracks C1 was observed using an optical microscope. According to the observation results, the presence of cracks was observed in all of the aluminum alloy specimens A1 to A16. In addition, among the test pieces S1 to S16 made of cold-rolled steel plate SPCC, cracks were observed in those having a workability PD of 0.65 or more. After the pre-bending operation, the test pieces in which the presence of cracks was confirmed were split by performing one separation bending operation in the opposite direction to the pre-bending operation. Specimens where the pre-bending operation did not reveal the presence of cracks required one additional pre-bending and separation bending.

(Separable test)
Furthermore, the present inventors used each test piece (α = 75° to 120°), which is a longitudinal plate test piece of 150 mm in length x 20 mm in width, and performed an operation of 40 N or less, which was set as a value that allows light work. Separability of each specimen was tested by separating bending after a pre-bending operation of 30° to 90° using a load. Tables 6 and 7 show the measurement results.

(Table 6) The table shows the minimum required angle when cold-rolled steel plate SPCC is used.
Δt/t 0.1 0.15 0.2 0.25
Processing rate PR (%) 45.0 42.5 40.0 37.7
t1.0 75° 90° 100° ×
t1.2 90° 75° × ×
t1.6 105° 120° × ×
t2.0 × × × ×

(Table 7) The table shows the minimum required angle when aluminum alloy A6000 is used.
Δt/t 0.2 0.3 0.4 0.5
Processing rate PR (%) 40.0 35.0 30.0 25.0
t1.0 75° 90° 105° ×
t1.2 90° 75° 120° ×
t1.6 105° × × ×
t2.0 120° × × ×

As is clear from Tables 6 and 7, the aluminum alloy A6000 has a Δt/t range of 0.2 to 0.4, and the cold-rolled steel plate SPCC has a Δt/t range of 0.1 to 0.2. Within the range, favorable separation bending maneuverability is obtained.

As described above, according to the press part integrally molded product 10 of the present embodiment or the assembly method using the same, a plurality of types of first press parts 14, second press parts 16, and Since the third press parts 18 are connected to each other so as to be divisible, when assembling the first press part 14, the second press part 16, and the third press part 18 into one assembly object, a plurality of types of presses are used. Since it is not necessary to sort the parts, pack them into parts boxes by type, and select and transport the parts box according to the type of the object to be assembled, the manufacturing cost can be sufficiently reduced. Specifically, with regard to the integrally molded product 10 of the present embodiment, the number of parts and the storage space for the parts are reduced to 1/3, and the physical distribution man-hours are greatly reduced. In addition, since the three parts can be stamped at once, the cost of parts and molds can be greatly reduced.

Further, according to the integrally molded product 10 of the present embodiment or the assembly method using the same, the integrally molded product 10 includes the plurality of types of the first pressed parts 14, the second pressed parts 16, the second The three pressed parts 18 are connected in a predetermined assembly order. As a result, when assembling a plurality of types of the first press part 14, the second press part 16, and the third press part 18 to one assembly object, the press-formed products are assembled in the order in which they are separated from the integrally-formed press-parts 10. Since it can be assembled to an object, the efficiency of the assembly work is improved, and the plurality of types of the first pressed parts 14, the second pressed parts 16, and the third pressed parts 18 are similar in shape to each other. Even if there is, erroneous assembly is prevented.

Further, according to the integrally molded product 10 of the present embodiment or the assembly method using the same, a plurality of types of first pressed parts 14, second pressed parts 16, and The third press part 18 is connected by a V-shaped notch 12 for generating stress concentration, and a bending load is applied to the V-shaped notch 12 to cause plastic deformation in the groove bottom wall 20 of the V-shaped notch 12. A pre-bending operation and a separate bending operation for breaking the groove bottom wall 20 of the V-shaped notch 12 by applying a smaller bending load to the V-shaped notch 12 in the direction opposite to the pre-bending operation than the pre-bending operation in a direction opposite to the pre-bending operation. A pair of press parts sandwiching the notch 12 are separated. As a result, the first pressed part 14, the second pressed part 16, and the third pressed part 18 can be separated from the integrally molded product 10 by a simple operation. The efficiency of the work of assembling the part 16 and the third press part 18 is improved.

Further, according to the press part integrally molded product 10 of the present embodiment or the assembly method using it, the pressed part integrally molded product 10 is made of aluminum alloy, and the remaining thickness of the V-shaped notch 12 is Δt, Assuming that the plate thickness of the integrally-formed pressed part is t, the ratio (Δt/t) between the residual thickness Δt of the V-shaped notch 12 and the plate thickness t of the integrally-formed pressed part 10 is 0.4 or less. be. As a result, a pre-bending operation in which a bending load is applied to the V-shaped notch 12 to cause plastic deformation in the groove bottom wall 20 of the V-shaped notch 12 and a pre-bending operation in the opposite direction to the pre-bending operation on the V-shaped notch 12 are performed. A separate bending operation of applying a bending load smaller than that of the bending operation to break the groove bottom wall 20 of the V-shaped notch 12 causes the integrally molded product 10 to be pressed into the first pressed part 14, the second pressed part 16, and the third pressed part. Since the parts 18 can be separated by a simple operation, the efficiency of the work of assembling the first press part 14, the second press part 16, and the third press part 18 to the object to be assembled can be improved.

Further, according to the press part integrally molded product 10 of the present embodiment or the assembly method using it, the pressed part integrally molded product 10 is made of cold-rolled steel plate, and the remaining thickness of the V-shaped notch 12 is When Δt is the plate thickness of the press part integrally molded product 10, the ratio (Δt/t) between the remaining thickness Δt of the V-shaped notch 12 and the plate thickness t of the press part integrally molded product 10 is 0.2. It is below. As a result, a pre-bending operation in which a bending load is applied to the V-shaped notch 12 to cause plastic deformation in the groove bottom wall 20 of the V-shaped notch 12 and a pre-bending operation in the opposite direction to the pre-bending operation on the V-shaped notch 12 are performed. A separate bending operation of applying a bending load smaller than that of the bending operation to break the groove bottom wall 20 of the V-shaped notch 12 causes the integrally molded product 10 to be pressed into the first pressed part 14, the second pressed part 16, and the third pressed part. Since the parts 18 can be separated by a simple operation, the efficiency of the work of assembling the press parts to the object to be assembled can be improved.

In the pressed part integrally molded product 10 of Example 1 described above, the V-shaped parts provided between the first pressed part 14 and the second pressed part 16 and between the second pressed part 16 and the third pressed part 18 The notch 12 was formed on one side, but in the integrally molded pressed part 110 of this embodiment, as shown in FIG. 24, the V-shaped notch 112 is formed on both sides. Even with such a V-shaped notch 112, the same effects as those of the first embodiment can be obtained.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, this is only one embodiment, and the present invention can be implemented in a mode in which various modifications and improvements are added based on the knowledge of those skilled in the art. can be done.

10: Press part integrally molded product 12: V-shaped notch 14: First press part 16: Second press part 18: Third press part 20: Groove bottom wall
P1: Press process
P2: Boxing process
P3: Transfer process P4: Assembly process

That is, the gist of the first invention is (a) a press part assembling method for assembling a plurality of types of press parts to one assembly object, and (b) a plurality of press parts to be assembled to the one assembly object. (c) a press molding step of press-molding some or all of the types of press parts using a common mold so as to form a press-part integrally-molded product that is detachably connected to each other; (d) a press part conveying step of conveying a parts box packed with integrally molded parts to an assembly site of the assembly target; and (d) separating the pressed parts from the integrally molded parts packed in the parts box. , and an assembling step of assembling to the object to be assembled; (f) in the assembling step, a preliminary bending operation of applying a bending stress to the V-shaped notch to generate plastic deformation in the bottom wall of the V-shaped notch; A pair of press parts sandwiching the V-shaped notch are separated by a separation bending operation in which a bending stress in the opposite direction to the bending operation is applied to cause plastic deformation in the bottom wall of the V-shaped notch and break it, (g) the integrally-formed pressed part is made of an aluminum alloy, and (h) the V-shaped notch has a residual thickness of Δt and a plate thickness of the integrally-formed pressed part is t. The value of the ratio of the residual thickness Δt of the notch to the plate thickness t of the integrally molded press part is 0.4 or less .

The gist of the second invention is (a) a press part assembly method for assembling a plurality of types of press parts to one assembly object, and (b) a plurality of types of press parts to be assembled to the one assembly object. (c) a press molding step of press-molding a part or all of the pressed parts using a common mold so as to form an integrally molded product in which the pressed parts are detachably connected to each other; (d) a press part conveying step of conveying a parts box packed with molded parts to an assembly site of the assembly target; (e) the pressed parts constituting the integrally molded pressed part are connected via a V-shaped notch, which is a groove having a V-shaped cross section; (f) in the assembling step, a pre-bending operation of applying a bending stress to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch; and a pre-bending operation of the V-shaped notch. A pair of press parts sandwiching the V-shaped notch are separated by a separating bending operation in which bending stresses in opposite directions are applied to cause plastic deformation in the bottom wall of the V-shaped notch and break it, and (i) The press part integrally molded product is made of a cold-rolled steel plate, and (j) the V-shaped notch is and the plate thickness t of the integrally molded product of the press part is 0.2 or less .

The gist of the third invention is that in the first invention or the second invention, the press molding step is performed so that some or all of the plurality of types of press parts to be assembled to the one assembly object are predetermined. The pressed part integrally molded product connected in the order of assembly is press-molded.

The gist of the fourth invention is that: (a) A pressed part integrally molded product used in an assembly method for assembling a plurality of types of pressed parts to one assembly object, and (b) to the one assembly object Some or all of the plurality of types of pressed parts to be assembled are connected to each other so as to be divisible, and (c) the pressed parts constituting the integrally molded product of the pressed parts are grooves having a V-shaped cross section. a pre-bending operation that applies a bending stress to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch; A pair of press parts sandwiching the V-shaped notch is separated by a separation bending operation in which a bending stress is applied in the opposite direction to cause plastic deformation in the bottom wall of the V-shaped notch and break it, (d ) The integrally molded pressed part is made of an aluminum alloy, and (e) When Δt is the remaining thickness of the V-shaped notch and t is the plate thickness of the integrally molded pressed part, the V-shaped notch is The value of the ratio (Δt/t) between the residual thickness Δt and the plate thickness t of the integrally molded press part is 0.4 or less .

The gist of the fifth invention is that: (a) an integrally molded product of pressed parts used in an assembling method for assembling a plurality of types of pressed parts to one assembly object, and (b) the one assembly object Some or all of the plurality of types of pressed parts to be assembled are connected to each other so as to be divisible, and (c) the pressed parts constituting the integrally molded product of the pressed parts are grooves having a V-shaped cross section. a pre-bending operation that applies a bending stress to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch; A pair of press parts sandwiching the V-shaped notch are separated by a separation bending operation in which a bending stress is applied in the opposite direction to cause plastic deformation in the bottom wall of the V-shaped notch and break it, and (f ) The integrally molded product of pressed parts is made of a cold-rolled steel plate, and (g) When the remaining thickness of the V-shaped notch is Δt and the thickness of the integrally molded product of pressed parts is t, the V-shaped The ratio (Δt/t) of the residual thickness Δt of the notch to the plate thickness t of the integrally molded press part is 0.2 or less .

The gist of the sixth invention is that in the fourth invention or the fifth invention, the press part integrally molded product is such that the plurality of types of press parts are connected in a predetermined assembly order. be.

According to the press part assembling method of the first invention, in the press molding step, some or all of the plurality of types of press parts to be assembled to the one assembly object are mutually divisible and connected to each other. Press molding is performed using a common mold so as to form an integrally molded product, and in a press parts conveying process, a parts box in which the integrally molded pressed parts are packed is conveyed to an assembly location for the assembly object, and assembled. In the attaching step, the pressed parts are separated from the integrally molded pressed parts packed in the parts box, and assembled to the object to be assembled. As a result, there is no need to separate multiple types of press parts, pack each type into a parts box, and select a parts box according to the type of the object to be assembled and transport it, thereby sufficiently reducing the manufacturing cost. can be realized.
Further, the pressed parts constituting the integrally molded pressed part are connected via a V-shaped notch, which is a groove having a V-shaped cross section. and a pre-bending operation to generate plastic deformation in the bottom wall of the V-shaped notch by applying a bending stress to the V-shaped notch in a direction opposite to the pre-bending operation to the bottom wall of the V-shaped notch. A pair of press parts sandwiching the V-shaped notch is separated by a separation bending operation that causes plastic deformation to occur in the V-shaped notch. The ratio of the residual thickness Δt of the V-shaped notch to the thickness t of the integrally-formed pressed part is 0.4 or less, where Δt is the residual thickness and t is the thickness of the integrally-formed pressed part. be. As a result, one pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a direction opposite to the pre-bending operation for the V-shaped notch. The press part can be separated from the press part integrally molded product with a simple operation by applying a bending load smaller than the pre-bending operation and breaking the bottom wall of the V-shaped notch. The efficiency of the work of assembling the press parts to the object to be assembled can be improved.

According to the press part assembling method of the second invention, in the press molding step, some or all of the plurality of types of press parts to be assembled to the one assembly object are mutually divisible and connected to each other. Press molding is performed using a common mold so as to form an integrally molded product, and in a press parts conveying process, a parts box in which the integrally molded pressed parts are packed is conveyed to an assembly location for the assembly object, and assembled. In the attaching step, the pressed parts are separated from the integrally molded pressed parts packed in the parts box, and assembled to the object to be assembled. As a result, there is no need to separate multiple types of press parts, pack each type into a parts box, and select a parts box according to the type of the object to be assembled and transport it, thereby sufficiently reducing the manufacturing cost. can be realized.
Further, the pressed parts constituting the integrally molded pressed part are connected via a V-shaped notch, which is a groove having a V-shaped cross section. and a pre-bending operation to generate plastic deformation in the bottom wall of the V-shaped notch by applying a bending stress to the V-shaped notch in a direction opposite to the pre-bending operation to the bottom wall of the V-shaped notch. A pair of press parts sandwiching the V-shaped notch is separated by a separation bending operation that causes plastic deformation to break the V-shaped notch, and the integrally formed press parts are made of cold-rolled steel plate, and the V-shaped Assuming that the remaining thickness of the notch is Δt and the thickness of the integrally molded product is t, the ratio of the residual thickness Δt of the V-shaped notch to the thickness t of the integrally molded product is 0.2. It is below. As a result, one pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a direction opposite to the pre-bending operation for the V-shaped notch. The press part can be separated from the press part integrally molded product with a simple operation by applying a bending load smaller than the pre-bending operation and breaking the bottom wall of the V-shaped notch. The efficiency of the work of assembling the press parts to the object to be assembled can be improved.

According to the press part assembling method of the third invention, the press part integrally molded product press-molded in the press molding step is a part or all of the plurality of types of press parts to be assembled to the one assembly object. are connected in a predetermined assembly order. As a result, it is possible to assemble the press-formed parts to the object to be assembled in the order in which they are separated from the integrally-formed pressed parts. Even if there are similar shapes, incorrect assembly is prevented.

According to the pressed part integrally molded product of the fourth aspect of the invention, some or all of the plurality of types of pressed parts to be assembled to one assembly object are connected to each other so as to be divisible, so that the plurality of types of pressed parts When assembling to one object to be assembled, there is no need to separate multiple types of press parts, pack each type in a parts box, select a parts box according to the type of the object to be assembled, and transport it. , a reduction in manufacturing costs can be fully realized.
Further, the pressed parts constituting the integrally molded product of pressed parts are connected by a V-shaped notch, which is a groove having a V-shaped cross section. and a pre-bending operation to generate plastic deformation in the bottom wall of the V-shaped notch, and a bending stress in the opposite direction to the pre-bending operation is applied to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch and break. A pair of press parts sandwiching the V-shaped notch is separated by a separation bending operation, the integrally molded product of the press parts is made of an aluminum alloy, the remaining thickness of the V-shaped notch is Δt, and the press part A ratio (Δt/t) between the remaining thickness Δt of the V-shaped notch and the thickness t of the integrally molded product is 0.4 or less, where t is the thickness of the integrally molded product. As a result, one pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a direction opposite to the pre-bending operation for the V-shaped notch. A single separation bending operation for breaking the bottom wall of the V-shaped notch by applying a bending load smaller than that of the pre-bending operation allows the pressed part to be separated from the integrally molded product of the pressed part with a simple operation. The efficiency of the work of assembling the press parts to the object to be assembled can be improved.

According to the integrally molded product for pressed parts of the fifth invention, some or all of the plurality of types of pressed parts to be assembled to one assembly object are connected to each other so as to be dividable. When assembling to one object to be assembled, there is no need to separate multiple types of press parts, pack each type in a parts box, select a parts box according to the type of the object to be assembled, and transport it. , the reduction of the manufacturing cost can be fully realized.
Further, the pressed parts constituting the integrally molded product of pressed parts are connected by a V-shaped notch, which is a groove having a V-shaped cross section. and a pre-bending operation to generate plastic deformation in the bottom wall of the V-shaped notch, and a bending stress in the opposite direction to the pre-bending operation is applied to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch and break. A pair of press parts sandwiching the V-shaped notch is separated by a separation bending operation, and the integrally molded product of the pressed parts is made of cold-rolled steel plate, and the remaining thickness of the V-shaped notch is Δt, and the A ratio (Δt/t) between the remaining thickness Δt of the V-shaped notch and the thickness t of the integrally molded product is 0.2 or less, where t is the thickness of the integrally molded product of the pressed parts. . As a result, one pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a direction opposite to the pre-bending operation for the V-shaped notch. A single separation bending operation for breaking the bottom wall of the V-shaped notch by applying a bending load smaller than that of the pre-bending operation allows the press part to be separated from the integrally molded press part with a simple operation. The efficiency of the work of assembling the press parts to the object to be assembled can be improved.

According to the pressed part integrally molded product of the sixth aspect of the invention, the pressed part integrally molded product is such that the plurality of types of pressed parts are connected in a predetermined assembly order. As a result, when assembling a plurality of types of press parts to one assembly object, the press-formed products can be assembled to the assembly object in the order in which they are separated from the integrally-formed press-parts, which increases the efficiency of the assembly work. In addition, even if some of the plurality of types of pressed parts have similar shapes to each other, erroneous assembly can be prevented.

That is, the gist of the first invention is (a) a press part assembling method for assembling a plurality of types of press parts to one assembly object, and (b) a plurality of press parts to be assembled to the one assembly object. (c) a press molding step of press-molding some or all of the types of press parts using a common mold so as to form a press-part integrally-molded product that is detachably connected to each other; (d) a press part conveying step of conveying a parts box packed with integrally molded parts to an assembly site of the assembly target; and (d) separating the pressed parts from the integrally molded parts packed in the parts box. and (e) the pressed part constituting the integrally molded pressed part is a groove having a V-shaped cross section and work hardening occurs at the bottom of the groove. (f) in the assembling step, a preliminary bending stress is applied to the V-shaped notch to further work harden the bottom wall of the V-shaped notch; a bending operation, and a separation bending with a smaller bending load than the pre-bending operation to apply a bending stress to the V-shaped notch in a direction opposite to the pre-bending operation to break the bottom wall of the V-shaped notch by brittle fracture. (g) the integrally formed pressed parts are made of an aluminum alloy; (h) the remaining thickness of the V-shaped notch is Δt; A ratio of the thickness t of the integrally molded product to the residual thickness Δt of the V-shaped notch is 0.4 or less, where t is the thickness of the integrally molded product.

The gist of the second invention is (a) a press part assembling method for assembling a plurality of types of press parts to one assembly object, and (b) a plurality of types of press parts to be assembled to the one assembly object. (c) a press molding step of press-molding a part or all of the pressed parts using a common mold so as to form an integrally molded product in which the pressed parts are detachably connected to each other; (d) a press part conveying step of conveying a parts box packed with molded parts to an assembly site of the assembly target; (e) the pressed part constituting the integrally molded pressed part is a groove having a V-shaped cross section, and work hardening is generated at the bottom of the groove. (f) the assembling step includes a pre-bending operation that applies a bending stress to the V-shaped notch to further work harden the bottom wall of the V-shaped notch; and a separate bending operation with a smaller bending load than the pre-bending operation for applying a bending stress in the direction opposite to the pre-bending operation to the V-shaped notch to break the bottom wall of the V-shaped notch by brittle fracture. A pair of press parts sandwiching the V-shaped notch is separated by (i) the integrally molded product of the pressed parts is made of cold-rolled steel plate; The ratio of the thickness t of the integrally molded product to the residual thickness Δt of the V-shaped notch is 0.2 or less, where t is the thickness of the integrally molded product.

The gist of the fourth invention is (a) an integrally molded pressed part used in an assembling method for assembling a plurality of types of pressed parts to one assembly object, and (b) the one assembly object Some or all of the plurality of types of pressed parts to be assembled are connected to each other so as to be dividable, and (c) the pressed parts constituting the integrally molded pressed parts are grooves having a V-shaped cross section. The work hardening is connected by a V-shaped notch generated at the groove bottom , and a pre-bending that applies a bending stress to the V-shaped notch to further work harden the bottom wall of the V-shaped notch. and a separate bending operation with a smaller bending load than the pre-bending operation to apply a bending stress to the V-shaped notch in a direction opposite to that of the pre-bending operation to break the bottom wall of the V-shaped notch by brittle fracture. (d) the integrally molded product of the pressed parts is made of an aluminum alloy; (e) the remaining thickness of the V-shaped notch is Δt; A ratio (Δt/t) between the remaining thickness Δt of the V-shaped notch and the thickness t of the integrally molded product is 0.4 or less, where t is the thickness of the integrally molded product of the pressed parts. That's what it is.

The gist of the fifth invention is (a) an integrally molded pressed part used in an assembling method for assembling a plurality of types of pressed parts into one assembly object, and (b) the one assembly object Some or all of the plurality of types of pressed parts to be assembled are connected to each other so as to be dividable, and (c) the pressed parts constituting the integrally molded pressed parts are grooves having a V-shaped cross section. The work hardening is connected by a V-shaped notch generated at the groove bottom , and a pre-bending that applies a bending stress to the V-shaped notch to further work harden the bottom wall of the V-shaped notch. and a separate bending operation with a smaller bending load than the pre-bending operation to apply a bending stress to the V-shaped notch in a direction opposite to that of the pre-bending operation to break the bottom wall of the V-shaped notch by brittle fracture. (f) the integrally formed pressed parts are made of cold-rolled steel plate; and (g) the remaining thickness of the V-shaped notch is Δt , where t is the plate thickness of the press part integrally molded product, the ratio (Δt/t) between the residual thickness Δt of the V-shaped notch and the plate thickness t of the press part integrally molded product is 0.2 or less. It is in being.

According to the press part assembling method of the first invention, in the press molding step, some or all of the plurality of types of press parts to be assembled to the one assembly object are mutually divisible and connected to each other. Press molding is performed using a common mold so as to form an integrally molded product, and in a press parts conveying process, a parts box in which the integrally molded pressed parts are packed is conveyed to an assembly location for the assembly object, and assembled. In the attaching step, the pressed parts are separated from the integrally molded pressed parts packed in the parts box, and assembled to the object to be assembled. As a result, there is no need to separate multiple types of press parts, pack each type into a parts box, and select a parts box according to the type of the object to be assembled and transport it, thereby sufficiently reducing the manufacturing cost. can be realized.
Further, the pressed parts constituting the integrally molded pressed part are connected through a V-shaped notch having a V-shaped cross section and work hardened at the bottom of the groove. In the additional step, a pre-bending operation is performed to apply a bending stress to the V-shaped notch to further work harden the bottom wall of the V-shaped notch, and a pre-bending operation is applied to the V-shaped notch in a direction opposite to the pre-bending operation. A pair of press parts sandwiching the V-shaped notch are separated by a separation bending operation with a bending load smaller than that of the pre-bending operation for applying a bending stress to break the bottom wall of the V-shaped notch by brittle fracture , The press part integrally molded product is made of an aluminum alloy, and when the remaining thickness of the V-shaped notch is Δt and the plate thickness of the pressed part integrally molded product is t, the remaining thickness Δt of the V-shaped notch is The value of the plate thickness ratio t of the integrally molded pressed part is 0.4 or less. As a result, one pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a direction opposite to the pre-bending operation for the V-shaped notch. The press part can be separated from the press part integrally molded product with a simple operation by applying a bending load smaller than the pre-bending operation and breaking the bottom wall of the V-shaped notch. The efficiency of the work of assembling the press parts to the object to be assembled can be improved.

According to the press part assembling method of the second invention, in the press molding step, some or all of the plurality of types of press parts to be assembled to the one assembly object are mutually divisible and connected to each other. Press molding is performed using a common mold so as to form an integrally molded product, and in a press parts conveying process, a parts box in which the integrally molded pressed parts are packed is conveyed to an assembly location for the assembly object, and assembled. In the attaching step, the pressed parts are separated from the integrally molded pressed parts packed in the parts box, and assembled to the object to be assembled. As a result, there is no need to separate multiple types of press parts, pack each type into a parts box, and select a parts box according to the type of the object to be assembled and transport it, thereby sufficiently reducing the manufacturing cost. can be realized.
Further, the pressed parts constituting the integrally molded pressed part are connected through a V-shaped notch having a V-shaped cross section and work hardened at the bottom of the groove. In the additional step, a pre-bending operation is performed to apply a bending stress to the V-shaped notch to further work harden the bottom wall of the V-shaped notch, and a pre-bending operation is applied to the V-shaped notch in a direction opposite to the pre-bending operation. A pair of press parts sandwiching the V-shaped notch are separated by a separation bending operation with a bending load smaller than that of the pre-bending operation for applying a bending stress to break the bottom wall of the V-shaped notch by brittle fracture , The press part integrally molded product is made of a cold-rolled steel plate, and when the remaining thickness of the V-shaped notch is Δt and the plate thickness of the pressed part integrally molded product is t, the residual thickness of the V-shaped notch is The value of the ratio of Δt and the plate thickness t of the integrally molded press part is 0.2 or less. As a result, one pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a direction opposite to the pre-bending operation for the V-shaped notch. The press part can be separated from the integrally molded press part by a simple operation by applying a bending load smaller than that of the pre-bending operation to break the bottom wall of the V-shaped notch. The efficiency of the work of assembling the press parts to the object to be assembled can be improved.

According to the pressed part integrally molded product of the fourth aspect of the invention, some or all of the plurality of types of pressed parts to be assembled to one assembly object are connected to each other so as to be divisible, so that the plurality of types of pressed parts When assembling to one object to be assembled, there is no need to separate multiple types of press parts, pack each type in a parts box, select a parts box according to the type of the object to be assembled, and transport it. , the reduction of the manufacturing cost can be fully realized.
In addition, the pressed parts constituting the integrally molded pressed part are connected by a V-shaped notch having a V-shaped cross section and work hardened at the bottom of the groove. a pre-bending operation that applies a bending stress to the notch to further work harden the bottom wall of the V-shaped notch; A pair of press parts sandwiching the V-shaped notch are separated by a separation bending operation with a bending load smaller than the pre-bending operation for breaking the bottom wall of the notch by brittle fracture , and the integrally molded product of the press parts is It is made of an aluminum alloy, and when the remaining thickness of the V-shaped notch is Δt and the plate thickness of the integrally molded product is t, the residual thickness Δt of the V-shaped notch and the plate of the integrally molded product are The value of the thickness t ratio (Δt/t) is 0.4 or less. As a result, one pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a direction opposite to the pre-bending operation for the V-shaped notch. A single separation bending operation for breaking the bottom wall of the V-shaped notch by applying a bending load smaller than that of the pre-bending operation allows the press part to be separated from the integrally molded press part with a simple operation. The efficiency of the work of assembling the press parts to the object to be assembled can be improved.

According to the integrally molded product for pressed parts of the fifth invention, some or all of the plurality of types of pressed parts to be assembled to one assembly object are connected to each other so as to be dividable. When assembling to one object to be assembled, there is no need to separate multiple types of press parts, pack each type in a parts box, select a parts box according to the type of the object to be assembled, and transport it. , the reduction of the manufacturing cost can be fully realized.
In addition, the pressed parts constituting the integrally molded pressed part are connected by a V-shaped notch having a V-shaped cross section and work hardened at the bottom of the groove. a pre-bending operation that applies a bending stress to the notch to further work harden the bottom wall of the V-shaped notch; A pair of press parts sandwiching the V-shaped notch are separated by a separation bending operation with a bending load smaller than the pre-bending operation for breaking the bottom wall of the notch by brittle fracture , and the integrally molded product of the press parts is It is made of cold-rolled steel plate, and when the remaining thickness of the V-shaped notch is Δt and the plate thickness of the integrally molded product is t, the residual thickness Δt of the V-shaped notch and the integrally molded product are the following: The value of the plate thickness t ratio (Δt/t) is 0.2 or less. As a result, one pre-bending operation for applying a bending load to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a direction opposite to the pre-bending operation for the V-shaped notch. A single separation bending operation for breaking the bottom wall of the V-shaped notch by applying a bending load smaller than that of the pre-bending operation allows the press part to be separated from the integrally molded press part with a simple operation. The efficiency of the work of assembling the press parts to the object to be assembled can be improved.

Claims (10)

A press part assembling method for assembling a plurality of press parts to one assembly object,
A press for press-molding some or all of the plurality of press parts to be assembled to the one assembly object using a common mold so as to form an integrally molded press part that is detachably connected to each other. a molding process;
a press part conveying step of conveying a parts box in which the integrally molded press parts are packed to an assembly site of the assembly target;
and an assembling step of dividing the pressed parts from the integrally molded pressed parts packed in the parts box and assembling them into the object to be assembled. In the press molding step, a part or all of the plurality of press parts to be assembled to the one assembly object are press molded to form an integrally molded press part that is connected in a predetermined assembly order. The method of assembling a press part according to claim 1, characterized in that: The plurality of pressed parts constituting the integrally molded pressed part are connected via V-shaped notches,
In the assembling step, a pre-bending operation for applying a bending stress to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch, and a direction opposite to the pre-bending operation for the V-shaped notch. A pair of press parts sandwiching the V-shaped notch is separated by a separation bending operation that applies a bending stress of 100 to the bottom wall of the V-shaped notch to cause plastic deformation and break the bottom wall of the V-shaped notch. A method for assembling the press parts according to item 1 or 2. The press part integrally molded product is made of an aluminum alloy, and when the remaining thickness of the V-shaped notch is Δt and the plate thickness of the pressed part integrally molded product is t, the remaining thickness Δt of the V-shaped notch is 4. The press part assembly method according to claim 3, wherein the ratio of the plate thicknesses t of the press part integrally molded product is 0.4 or less. The press part integrally molded product is made of a cold-rolled steel plate, and when the remaining thickness of the V-shaped notch is Δt and the plate thickness of the pressed part integrally molded product is t, the residual thickness of the V-shaped notch is 4. The method of assembling press parts according to claim 3, wherein a ratio of [Delta]t to the plate thickness t of the integrally molded press part is 0.2 or less. An integrally molded pressed part used in an assembly method for assembling a plurality of types of pressed parts into one assembly object,
An integrally molded product of pressed parts, wherein some or all of the plurality of types of pressed parts to be assembled to the one assembly object are connected to each other so as to be divisible. 7. The integrally molded pressed part product according to claim 6, wherein the plurality of types of pressed parts are connected in a predetermined assembly order. A plurality of pressed parts constituting the integrally molded pressed part are connected by V-shaped notches,
a pre-bending operation for applying a bending stress to the V-shaped notch to cause plastic deformation in the bottom wall of the V-shaped notch; 8. The press according to claim 6 or 7, wherein the pair of press parts sandwiching the V-shaped notch are separated by a separation bending operation that causes plastic deformation in the bottom wall of the V-shaped notch to break it. Parts integrally molded product. The integrally molded pressed part is made of an aluminum alloy,
The value of the ratio of the residual thickness Δt of the V-shaped notch to the plate thickness t of the integrally molded product, where Δt is the residual thickness of the V-shaped notch and t is the plate thickness of the integrally molded product. 9. The integrally molded pressed part product according to claim 8, wherein ([Delta]t/t) is 0.4 or less. The press part integrally molded product is made of cold-rolled steel plate,
The value of the ratio of the residual thickness Δt of the V-shaped notch to the plate thickness t of the integrally molded product, where Δt is the residual thickness of the V-shaped notch and t is the plate thickness of the integrally molded product. 9. The integrally molded press part according to claim 8, wherein ([Delta]t/t) is 0.2 or less.

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