JP2006035273A - Press drawing method and die device used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform the drawing work of a complicated shape because press drawing work can be performed in the state where a blank is pinched at a proper pressure by a punch and the liquid in a working hole part when the punch is lowered for drawing the blank and the generation of breakage of the blank, wrinkles and reducing marks on the blank can be suppressed. <P>SOLUTION: An upper die device 1 in which a blank holder 2 with which the upper surface of the blank is pressed is provided freely vertically movably, a punch inserting hole part 3 is provided on the blank holder and the punch with which the blank is drawn is provided freely vertically operably in the punch inserting hole part and a die 6 on which the bottom surface is placed is fixedly arranged and a drawing hole part 7 is provided on the die. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a press drawing method used for press drawing of, for example, a top plate or a sink of a stainless steel sink, and a mold apparatus thereof.

  In recent years, for sinks of this type, for example, when installing high-quality sinks such as system kitchens in urban apartments and kitchen renovations, there is a restriction on the installation space in order to secure a wide cooking space In recent years, a dishwasher has been incorporated in the lower part of the top plate, and the cabinet portion under the sink is inevitably narrowed. For this reason, downsizing of the sink is strongly desired.

Conventionally, in the drawing processing of a sink or the like of this kind of stainless steel sink, from the viewpoint of the squeezing and overhanging properties of the material and the occurrence of cracks, wrinkles and squeezing scratches, for example, as shown in FIGS. When it is necessary to reduce the diameter of the corner radius r of W, it is difficult to perform deep drawing at once. Therefore, the drawing process is performed in multiple steps, or the annealing process is performed during the drawing process. ing.
JP 2001-47142 A JP-A-7-132330

  However, in the case of the above conventional press drawing method, since drawing and annealing processes are required multiple times, the processing productivity is likely to be reduced, and an accompanying facility for the delivery of the semi-finished product is also required. If it rises, a large installation space may be required for the apparatus. In the hydraulic type, a large hydraulic pressure chamber is formed in the lower mold apparatus, and the internal pressure of the hydraulic pressure chamber includes a pressure control valve. A hydraulic circuit structure is required, and the entire apparatus is complicated accordingly, resulting in an increase in manufacturing cost.

  The present invention aims to solve these disadvantages. Among the present inventions, the invention of the method according to claim 1 is provided with a blank holder capable of pressing the upper surface of the blank so as to be movable up and down. An upper die device in which a punch insertion hole is provided in the blank holder, and a punch capable of drawing the blank in the punch insertion hole is provided in a vertically movable manner, and a die on which the bottom surface of the blank can be placed is fixed. The blank is sandwiched between the punch and the liquid in the processing hole at an appropriate pressure when the press drawing is performed in cooperation with a lower die apparatus provided with a drawing hole in the die. A press drawing method characterized in that press drawing is performed in a pressed state.

According to the second aspect of the present invention, when a sink for a sink is processed by a press drawing method, the depth of the sink, the corner radius of the sink, and the plate thickness of the sink are set to d, r, and t, respectively. Then, the following relational expression (a) to (d) 3 <(d / r) <5 (a)
150 mm ≦ d ≦ 210 mm (b)
40mm <r ... (c)
0.5mm ≦ t ≦ 1.2mm ・ ・ (d)
In the press drawing method of a sink for a sink.

  According to a third aspect of the present invention, the material of the sink is JIS G 4305 SUS304.

  According to a fourth aspect of the present invention, a blank holder capable of pressing the upper surface of the blank is provided so as to be movable up and down, a punch insertion hole is provided in the blank holder, and the blank is drawn into the punch insertion hole. An upper die device in which a punch capable of moving up and down is provided, and a lower die device in which a die on which the bottom surface of the blank can be placed is fixedly arranged and a hole for drawing is provided in the die. The lower mold apparatus is provided with a cylinder that can move up and down, the drawing hole and a hydraulic chamber that can be filled with liquid by the cylinder, and the blank and the punch when the punch is drawn down. A press drawing die apparatus characterized in that a cushion mechanism that allows the cylinder to descend is provided in a state of being clamped at a proper pressure with the liquid in the hole for machining.

  The invention according to claim 5 is characterized in that the cushion mechanism has a hydraulic cylinder structure.

  As described above, according to the present invention, when the punch is drawn down, the blank is pressed with the punch and the liquid in the processing hole at an appropriate pressure. Drawing can be performed, blank cracks, wrinkles and drawing flaws can be suppressed, drawing of complex shapes can be performed, for example, sinks with small corner radii can be processed without annealing. It can be drawn by one or at most two drawing operations, so that it is possible to increase the processing productivity, and it is necessary to have an additional facility for delivery of semi-finished products, reducing the equipment cost and saving the installation space. Can be planned.

In the method invention of claim 2, when the sink for the sink is processed by the press drawing method, the depth of the sink, the corner radius of the sink, and the plate thickness of the sink are set to d, r, respectively. And t, the following relational expression (a) to (d) 3 <(d / r) <5 (a)
150 mm ≦ d ≦ 210 mm (b)
40mm <r ... (c)
0.5mm ≦ t ≦ 1.2mm ・ ・ (d)
Therefore, it is possible to manufacture a sink with a small corner radius, and accordingly, there is a demand for downsizing of the sink, a request to secure the inner volume of the sink and to maintain and expand the bottom area. Can produce a sink that can fully meet the requirements of a new design with a sense of squareness. In addition, as long as these relational expressions are satisfied, the sink can be drawn in multiple steps. In addition, it can be manufactured by one or at most two press drawing processes without being annealed, so that the manufacturing can be easily performed and the manufacturing cost can be reduced.

  Further, in the invention according to claim 3, by using JIS G 4305 SUS304 as the material of the sink, for example, a shape called a rectangle or an irregular shape is complicated due to the characteristic of the inherent material. The sink can be easily manufactured by press drawing once or at most twice without annealing.

  In the invention according to claim 5, since the cushion mechanism has a hydraulic cylinder structure, the structure of the cushion mechanism can be simplified and the clamping pressure can be easily controlled.

  1 to 9 show an embodiment of the present invention, FIGS. 1 to 8 show a first embodiment, and FIG. 9 shows a second embodiment.

  The first embodiment shown in FIGS. 1 to 8 is applied to the drawing process of the sink W of the sink. Reference numeral 1 denotes an upper mold device, which is attached to a slide that moves up and down by a hydraulic cylinder (not shown). A blank holder 2 capable of pressing the upper surface of a blank W made of SUS304 or SUS403 stainless steel to be the sink W is provided, and a punch insertion hole 3 is formed in the blank holder 2, and the punch insertion hole 3 is formed. Further, the punch 4 capable of drawing the blank W is provided by a hydraulic cylinder or the like so as to be movable up and down independently of the blank holder 2.

  Reference numeral 5 denotes a lower die apparatus, which is configured by fixedly arranging a die 6 on which the bottom surface of the blank W can be placed, and is provided with a drawing hole 7 in the die 6.

  Reference numeral 8 denotes a cushion mechanism. In this case, the die 6 is attached to the die holder 9 in a liquid-tight manner, a cylinder hole 10 is formed in the die holder 9, and the cylinder 11 is slidable in the cylinder hole 10 in a liquid-tight manner. A hydraulic chamber E capable of containing liquid L, in this case water, is formed by the drawing hole 7 and the cylinder 11, and a hydraulic cylinder mechanism 12, in this case a hydraulic cylinder mechanism, is disposed below the cylinder 11. The cushion pad 13 is disposed on the rod 12a of the hydraulic cylinder mechanism 12 including the rod 12a and the cylinder portion 12b, the cushion pin 14 is interposed between the cushion pad 13 and the cylinder 11, and the cylinder portion 12b is not illustrated. With the pressure control unit connected, when the punch 4 is drawn down, the blank W is sandwiched between the punch 4 and the liquid L in the processing hole 7 with an appropriate pressure. It is configured to permit the descent of the cylinder 11.

  Moreover, as a material of the blank of the sink W, a ferrite-based JIS G 4305 SUS430 [SUS430SUS430 (18% Cr)] or a system kitchen used for a general sink and used for a simple rectangular shape of the sink. Two types of austenitic JIS G 4305 SUS304 [SUS430SUS304 (18% Cr-8% Ni)] used for high-quality sinks such as rectangular and irregularly shaped sinks. In addition, a material (SUS304J1) to which Cu is added to improve antibacterial properties and squeezability is also used.

These sinks W are manufactured by press drawing with the cooperation of the upper die device and the lower die device. For example, the edge portion W ₁ , the tank portion W ₂ , the connection port portion W _3, and the plug port portion W ₄ are formed. The

In this case, as shown in FIGS. 4 to 7, when the depth of the sink (from the top surface to the outer bottom surface), the corner radius of the sink, and the plate thickness of the sink are d, r, and t, respectively, (D) relational expression 3 <(d / r) <5 (a)
150 mm ≦ d ≦ 210 mm (b)
40mm <r ... (c)
0.5mm ≦ t ≦ 1.2mm ・ ・ (d)
It is formed to satisfy.

  That is, it is manufactured so as to satisfy the relationship in the shaded area shown in FIG.

  Here, the reason why the sink depth d is 150 mm ≦ d ≦ 210 mm is that the sink depth is generally 150 mm for shallow and 210 mm for deep, and 40 mm <r. This is because the cleaning is troublesome when the corner radius r is 40 mm or less, and the care of use is taken into consideration. The thickness of 0.5 mm ≦ t ≦ 1.2 mm is 0.5 mm ≦ t ≦ 1.2 mm. If it is less than the above, there is a possibility that a problem may occur in the material strength, and at the same time, if it is attempted to draw by press-working twice, cracking is likely to occur. This is because sometimes it cannot be squeezed deeply.

  Therefore, under the conditions of the above relational expressions (b), (c), and (d), as long as the relational expression 3 <(d / r) <5 in (a) is satisfied, one annealing is not performed. The sink W can be manufactured by one or at most two press drawing processes. That is, when (d / r) is 3 or less, the corner radius r becomes large and the intended purpose cannot be achieved, and when (d / r) is 5 or more, annealing is not performed once or twice. This is because it is the limit of press drawing.

  Since the first embodiment of the present embodiment has the above-described configuration, the blank W is artificially or automatically fed onto the die 6 as shown in FIG. 1, and first, as shown in FIG. The holder 2 is lowered, and the blank W is sandwiched between the blank holder 2 and the die 6, and then the punch 4 of the upper mold apparatus 1 is lowered in this sandwiched state, and the press drawing process is completed as shown in FIG. After the processing is completed, the punch 4 is first lifted, and then the blank holder 2 is lifted. The drawn semi-finished product is taken out, transferred to another punching die device, and punched into a predetermined shape. Will be.

  Accordingly, when the punch 4 is drawn down, press blanking can be performed in a state where the blank W is sandwiched between the punch 4 and the liquid E in the machining hole portion 7 at an appropriate pressure, and the blank W is cracked. Can reduce wrinkles and squeezing, and can perform complex shape drawing. For example, a sink with a small corner radius can be squeezed once or at most twice without annealing. Therefore, it is possible to increase the processing productivity, and it is necessary to provide an additional facility for delivery of the semi-finished product, so that the facility cost can be reduced and the installation space can be saved.

In this case, in these press drawing processes, when the sink depth, the corner radius of the sink, and the plate thickness of the sink are d, r, and t, respectively, as shown in FIGS. ) To (d) 3 <(d / r) <5 (a)
150 mm ≦ d ≦ 210 mm (b)
40mm <r ... (c)
0.5mm ≦ t ≦ 1.2mm ・ ・ (d)
Therefore, it is possible to manufacture a sink having a small corner radius r, and accordingly, there is a demand for downsizing of the sink, and it is necessary to secure the inner volume of the sink and to maintain and expand the bottom area. Sinks that can fully meet the demands and have a square design and a novel design feel can be produced. Further, as long as these relational expressions are satisfied, the drawing process is divided into multiple steps in stages. However, it can be manufactured by one or at most two press drawing processes without being annealed, and the manufacturing can be easily performed and the manufacturing cost can be reduced.

  At this time, by using JIS G 4305 SUS304 as the material of the sink, it is possible to form a complex sink having a shape called a rectangle or a deformed shape once or at least twice without annealing due to the characteristics of the inherent material. It can be easily manufactured by one press drawing process.

  In this case, since the cushion mechanism 8 has a hydraulic cylinder structure, the structure of the cushion mechanism 8 can be simplified, and the manufacturing cost can be reduced.

  The second embodiment shown in FIG. 9 shows another example structure. In this case, a plurality of cylinder holes 10 and 10 are formed in the die holder 9 as the cushion mechanism 8, and two cylinder holes are formed in this case. The cylinders 11 and 11 are provided in a fluid-tight manner so as to be slidable in the vertical direction, and the drawing hole 7 and the cylinders 11 and 11 form a liquid pressure chamber E in which liquid L, in this case water can be sealed. A hydraulic cylinder mechanism 12, in this case a hydraulic cylinder mechanism, is disposed below the cylinder 12, and a cushion pad 13 is disposed on the rod 12 a of the hydraulic cylinder mechanism 12 including the rod 12 a and the cylinder portion 12 b. A cushion pin 14 is interposed between 11 and 11.

  Even in the second embodiment, the same effects as those in the first embodiment can be obtained.

  The present invention is not limited to the above embodiment, and the structure and form of the upper mold apparatus 1, the blank holder 2, the punch 4, the lower mold apparatus 5, the die 6, and the cushion mechanism 8 are appropriately changed. Designed.

  As described above, the intended purpose can be sufficiently achieved.

It is a description longitudinal cross-sectional view of the example of 1st Embodiment of this invention. It is a description longitudinal cross-sectional view of the example of 1st Embodiment of this invention. It is a description longitudinal cross-sectional view of the example of 1st Embodiment of this invention. It is a top view of the sink of the first embodiment of the present invention. It is a perspective view of the sink of the first embodiment of the present invention. It is a fragmentary longitudinal cross-sectional view of the sink of the first embodiment of the present invention. It is a fragmentary top view of the sink of the 1st example of an embodiment of the invention. It is relationship explanatory drawing of the depth of the sink of the example of 1st Embodiment of this invention, and a corner radius. It is a description longitudinal cross-sectional view of the 2nd embodiment of this invention.

Explanation of symbols

W sink (blank)
d Depth t Thickness r Corner radius L Liquid E Hydraulic chamber 1 Upper mold device 2 Blank holder 3 Punch insertion hole 4 Punch 5 Lower mold device 6 Die 7 Drawing hole 8 Cushion mechanism

Claims (5)

  A blank holder capable of pressing the upper surface of the blank is provided so as to be movable up and down, a punch insertion hole is provided in the blank holder, and a punch capable of drawing the blank is provided in the punch insertion hole. When performing press drawing by the cooperation of a die device and a lower die device in which a die on which the bottom surface of the blank can be placed is fixed and a drawing hole is provided in the die, the blank A press drawing method characterized in that press drawing is performed in a state where the punch is sandwiched between the punch and the liquid in the processing hole at an appropriate pressure. When a sink for a sink is processed by the press drawing method according to claim 1, when the depth of the sink, the corner radius of the sink, and the plate thickness of the sink are d, r, and t, respectively, the following (a) Relational expression 3 to (d) << d / r) <5 (a)
150 mm ≦ d ≦ 210 mm (b)
40mm <r ... (c)
0.5mm ≦ t ≦ 1.2mm ・ ・ (d)
A method of press drawing a sink for a sink characterized by satisfying   The press drawing method according to claim 2, wherein the material of the sink is JIS G 4305 SUS304.   A blank holder capable of pressing the upper surface of the blank is provided so as to be movable up and down, a punch insertion hole is provided in the blank holder, and a punch capable of drawing the blank is provided in the punch insertion hole. A die device and a lower die device in which a die on which the bottom surface of the blank can be placed is fixedly arranged and a drawing hole is provided in the die, and the cylinder can be moved up and down in the lower die device. The drawing hole and the hydraulic chamber in which the liquid can be sealed by the cylinder are provided, and the blank is sandwiched between the punch and the liquid in the processing hole at an appropriate pressure when the punch is drawn down. A press-drawing die apparatus characterized by comprising a cushion mechanism that allows the cylinder to descend in a pressed state. 5. The press drawing mold apparatus according to claim 4, wherein the cushion mechanism has a liquid cylinder structure.

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