JP3292036B2 - Drawing method and drawing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing method and a drawing apparatus for a sheet metal material, and is used, for example, for drawing a tank (capsule) in a heating heat exchanger of an automotive air conditioner. It is suitable.

[0002]

2. Description of the Related Art Conventionally, when drawing a thin sheet metal material, a drawing process of processing the metal material into a product shape and a trimming process of separating the drawn product shape portion from the metal material are known. A so-called pinch trimming process performed in one step is known.

[0003]

If this pinch trimming process is applied to a material having a small tensile strength and elongation, such as aluminum, there is a problem that the corner of the ceiling of the product tends to be broken. FIG. 8 shows that when the box-shaped tank 2 of the heat exchanger for heating is drawn using the pinch trimming process on the thin plate-shaped metal material 1 made of aluminum, the ceiling corner of the box-shaped tank 2 is broken. This shows a state where X has occurred. In FIG. 8, reference numeral 3 denotes a rectangular rising portion that remains in the scrap portion of the metal material 1 after the box-shaped tank 2 is trimmed.

[0004] Due to the occurrence of the tears X, it has not been possible in the past to draw the box-shaped tank 2 by pinch trimming. Therefore, conventionally, as shown in FIG. 9, a first drawing step for forming the basic shape of the tank with respect to the metal material 1, a shaping drawing step for shaping the drawing shape by the first drawing step, and this shaping The end face of the tank portion 2 after the cutting has been divided into three steps, namely, a trimming step of trimming the metal material 1, and drawing of the tank shape has to be performed. As described above, since the drawing of the tank shape is performed in three steps,
Inevitably, the number of processing steps increases, resulting in an increase in processing cost.

[0005] The present invention has been made in view of the above points,
An object of the present invention is to enable a pinch trimming process to be performed satisfactorily even in a metal material having a small tensile strength and elongation, such as aluminum, without causing a tear in a ceiling corner of a product shape.

[0006]

In order to achieve the above object, the present invention employs the following technical means. That is, according to the first and second aspects of the present invention , there is provided a drawing apparatus for drawing a thin metal material (1) by a pressing operation of a press die (A) to form a predetermined product shape portion (2). A lancing mechanism for performing a lancing process for forming a slit (4) around a portion where a product shape part (2) is formed.
Parts (15, 17a) and, after this lancing processing, for drawing processing for performing drawing processing for forming the product shape part (2)
Mold portion (11, 14), the trimming mechanism for performing edge cutting processing to separate the end face from the metallic material (1) of the product shape portion after the drawing (2) and (13), said La
Operation of the lancing mechanism (15, 17a)
An interlocking mechanism (20, interlocking with the pressing operation of the mold (A))
22), and a press operation of the press die (A).
In one stage, the interlocking mechanism (20, 22)
By operating the lancing mechanism (15, 17a),
Performs lancing and presses the press die (A)
When the work shifts to the second stage, the drawing die (1
1, 14), the drawing process is performed, and the press die
When the pressing operation of (A) shifts to the third stage,
The trimming process is performed by a trimming mechanism (13).
And the lancing mechanism section includes the slot.
Includes a lancing punch (15) that forms a slot (4)
And the interlocking mechanism is configured to press the press die (A).
Cam mechanism (20, 22) linked to the
The metal material of the lancing punch (15)
The projecting operation and the storing operation for (1) are performed by the cam.
It is characterized in that it is performed by a mechanism (20, 22) .

As described above, after the slit (4) is formed by lancing, the product shape part (2) is drawn and formed. Therefore, the material of the metal material (1) is drawn during the drawing. ) Can be easily flowed from the portion toward the drawn portion. As a result, even if the drawing process and the trimming process of the product shape portion are performed in one step of the pressing operation, it is possible to reliably prevent the occurrence of tears at the ceiling corner portion, and it is possible to perform the pinch trimming process satisfactorily. Processing productivity can be greatly improved. Also,
Cam mechanism (20, 2
In 2), just before the start of drawing, lancing
Can be performed instantaneously. In addition, press mold (A)
Use cam mechanisms (20, 22) linked to the
With this, lancing processing can be performed with a simple mechanism that is purely mechanical.
It can be carried out.

[0008] In particular, in the invention according to claim 2, the metal material (1) in the form of a thin plate and a strip is interlocked with the pressing operation of the press die (A) for every predetermined length in the metal material longitudinal direction (B). ) is moved, the narrowing device for shaping by drawing the product shape portion (2), in the direction perpendicular to the longitudinal direction (B) of the metallic material (1), the product shape portion (2)
A slit (4) is formed by lancing in a portion around the portion where the metal material (1) is formed and on the rear side with respect to the moving direction (B) of the metal material (1).

Thus, even when the band-shaped metal material (1) is drawn, the material flow of the metal material (1) can be easily performed. In the invention according to claim 3,
In claim 1 or 2, the mold for drawing is:
A die (11) and a punch (14) are included. Of the die (11), an end face on the metal material (1) side has a rising portion (3) remaining on the metal material (1) after the edge cutting. The step (h) is formed to avoid interference with the drawing die (11), so that the step (h) reliably prevents the rising portion (3) of the scrap portion from being pressed down by the drawing die (11). it can. Therefore, the material flow is not hindered by the pinching of the rising portion 3.

[0010]

[0011] The reference numerals in parentheses of the above means, are intended to show the correspondence with specific means described embodiments to be described later.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of a press die A of a drawing apparatus used for carrying out the method of the present invention. The press die A of FIG. 1 is a tank (capsule) in a heating heat exchanger of an automobile air conditioner. For drawing. In FIG. 1, reference numeral 1 denotes a metal material for forming a tank in the heat exchanger for heating, which is a thin plate made of an aluminum alloy and has a thickness t of 1.2 m, for example.
m. Here, the metal material 1 is moved rightward in FIG.
Direction), and the material width of the band is, for example, 95 mm.

Reference numeral 10 denotes an upper die table of a press die A, which is moved up and down by a hydraulic drive mechanism (not shown). Reference numeral 11 denotes a drawing die, which is integrally connected to the lower surface of the upper mold base 10 by appropriate fastening means (bolts or the like) not shown. The drawing die 11 has a concave mold surface 11 for forming a tank shape.
a is formed. Reference numeral 12 denotes a lower die base (fixed base) of the press die A, and a trimming punch 13 is integrally connected to an upper surface thereof by an appropriate fastening means (bolt or the like) not shown. The trimming punch 13 has a punch surface 13a for edge cutting formed on an end surface thereof. On the upper surface of the trimming punch 13, a drawing punch 1 is provided.
4 are integrally connected by appropriate fastening means (bolts or the like). This drawing punch 14 is used for the drawing die 1.
It is formed in a shape corresponding to the concave processing surface 11a so as to form a tank shape with the first concave processing surface 11a.

Next, a lancing mechanism for performing lancing processing (slit processing) on the metal material 1 will be described. Reference numeral 15 denotes a lancing punch, which is a punch surface for forming a linear slit 4 having a predetermined width in the metal material 1. 15a is provided at the lower end. Reference numeral 16 denotes a hanger bolt screwed to the upper end of the lancing punch 15. The lancing punch 15 and the hanger bolt 16 are vertically movably fitted and held in a vertical fitting hole 11 b formed in the drawing die 11.

A spring 16a is engaged with the head of the upper end of the hanger bolt 16, so that the spring 16a always exerts an upward spring force on the hanger bolt 16 in FIG. Reference numeral 17 denotes a cushion plate, which is provided corresponding to the drawing die 11 with the metal material 1 interposed therebetween. The cushion plate 17 is for sandwiching the metal material 1 between the drawing material 11 and the drawing plate 11. It is. Also, of the cushion plate 17,
A lancing die 17a for performing lancing processing with the lancing punch 15 is formed at a portion facing the lancing punch 15.

Reference numeral 18 denotes a die cushion, which is shaped like a shaft. The upper end of the die cushion is in contact with the lower surface of the cushion plate 17, and a predetermined pressure P is applied upward in FIG. The lower surface is always in pressure contact with a predetermined pressure. 19 is a cam support column,
It is integrally connected to the lower mold base 12 by a suitable fastening means (bolt or the like) not shown. A rotary cam 20 is rotatably supported by a shaft 20a at a position near the upper end of the cam support column 19. Further, the cam support column 19 has a stopper surface 19a for regulating the rotation position of the rotation cam 20,
19b (see FIG. 2).

Reference numeral 21 denotes a tension spring, one end of which is supported by the upper end of the cam support column 19 and the other end of which is the rotary cam 2.
0, it is supported at a position below the shaft 20a. 1 and 2 acts on the rotating cam 20 by the spring force of the extension spring 21. Then, as shown in FIG. 2A, the rotation cam 20 is moved by the spring force of the tension spring 21 to the stopper surface 19.
b, the slide cam 22 below
A protruding cam surface 20b is formed at a portion facing the side.

The slide cam 22 is slidably fitted in a horizontal fitting hole 11c provided in the drawing die 11, and is supported. Therefore, the slide cam 22 moves the drawing die 1 against the vertical movement of the upper die table 10.
It moves up and down together with 1. Of this slide cam 22,
A punch press-down surface 22a that is inclined upward from the lower surface to the upper surface is formed at the end on the lancing punch 15 side. In the end of the slide cam 22 on the side of the rotation cam 20, a contact surface 22b with which a cam surface 20b of the rotation cam 20 and a cam surface 23a of a return cam 23 described below abut is integrally provided. .

The return cam 23 is disposed below the rotary cam 20 as shown in FIG. 1, and is integrally connected to the cam support post 19 by a suitable fastening means (bolt or the like) not shown. I have. The return cam 23 has a portion 23 b extending upward to a position near the rotation cam 20 at a position closer to the slide cam 22 than the rotation cam 20.
And a cam surface 23a is formed on the upper end of the portion 23b. This cam surface 23a is in the direction in which the slide cam 22 is separated from the lancing punch 15 (to the left in FIG. 1).
To the cam surface 23a.
Is an inclined surface inclined upward from the left side of FIG. 1 to the upper right side.

Next, the drawing method based on the present embodiment will be described. FIG. 1 shows a state in which the lancing work has been completed on the metal material 1 by the lancing punch 15, but the drawing processing method at the beginning of the drawing method is shown. In the state, FIG.
The upper die table 10 is located at the top dead center position where it is located above the state shown in FIG. At this top dead center position, the slide cam 22
The lancing punch 1 is located at the positions (a) and (b).
5 is located at a retracted position (that is, a position retracted to the left side in FIG.
Is not pushed down by the slide cam 22. As a result, the lancing punch 15 is in the housed state shown in FIG.

Further, as shown in FIG. 2A, the rotating cam 20 is in contact with the stopper surface 19b by the spring force of the tension spring 21. Now, from the above state, the upper mold base 10 is lowered by a predetermined amount,
When the slider reaches the position shown in FIG.
The second contact surface 22b contacts the cam surface 20b of the rotating cam 20. Thereby, the slide cam 22 is pressed by the cam surface 20b and slides (forwards) to the right in the horizontal direction. The advance of the slide cam 22 is continued to the position shown in FIG. 2A, and the cam surface 22 a of the slide cam 22 is moved by the advance of the slide cam 22.
Press 5 down.

In the above position, the pushing amount of the lancing punch 15 is maximized, and the lancing punch 15 is in the protruding state shown in FIG. 2D (FIG. 1 shows this protruding state). Perform lancing. That is, as shown in FIG. 3, by pushing out the punching surface 15 a of the lancing punch 15, the metal material 1 is formed with a depressed portion 5 between the lancing punch 15 and the lancing die 17 a of the cushion plate 17, and the Is formed.

Here, the formation of the slit 4 is carried out according to FIG.
As shown in (b), the process is performed at one position in a direction orthogonal to the longitudinal direction of the band-shaped metal material 1. In FIG. 3B, the left slit 4 is formed this time, and the right slit 4 is formed by the previous lancing process, and has already been expanded due to the material flow of the previous drawing process. The distance L between the slit 4 and the previously formed slit 4 is larger than the long side dimension M of the box-shaped tank 2 shown in FIGS. Thereby, a predetermined interval is formed between the end of the box-shaped tank 2 and the slit 4.

Next, when the upper mold base 10 is further lowered and the slide cam 22 is lowered from the position shown in FIG.
The shape of the cam surface 20b of the rotating cam 20 and the return cam 2
Due to the shape of the third cam surface 23a, the slide cam 22 slides (retreats) to the left in the horizontal direction, and the retraction of the slide cam 22 is completed at the position shown in FIG. By retreating the slide cam 22, the lancing punch 15 is pushed upward by the spring force of the spring 16a,
The storage state shown in FIG. 4D and FIG.

As shown in FIG. 4A, when the lancing punch 15 is stored, the lower end surface of the drawing die 11 pushes down the metal material 1 by a small amount as the upper die 10 is lowered. The drawing process of the box-shaped tank 2 is started between the drawing die 11 and the drawing punch 14. In the metal material 1, since the slits 4 are formed in advance, when this drawing is started, as shown in FIG. 4B, the material of the metal material 1 is box-shaped from the slit 4 portion. It can be easily flowed toward the drawing portion of the tank 2. As a result, even if the drawing of the box-shaped tank 2 is performed in one step, it is possible to reliably prevent the ceiling corner of the box-shaped tank 2 from being broken.

Next, when the upper mold base 10 is further lowered and the slide cam 22 reaches the position shown in FIG.
0, the position where the drawing die 11 and the slide cam 22 are lowered most, that is, the bottom dead center. At this time, the slide cam 22 maintains the retracted state between and. FIG. 5 (a) shows an upper die table 10, a drawing die 11 and
And the slide cam 22 has reached the bottom dead center.
These members 10, 11, and 22 correspond to the diaphragm shown in FIG.
It descends from the state at the start to the bottom dead center in FIG.
The drawing of the box-shaped tank 2 is completed during the
Trimming to separate the end face of the tank 2 from the metal material 1
To end. FIG. 5A shows the state immediately after the end of the trimming.
Indicates the status. Then, at the bottom dead center position, the upper die table 10 reverses its movement and rises to return to the initial top dead center position. During the ascent of the upper die table 10, the contact portion 22 of the slide cam 22 is
2B, the rotary cam 20 is pushed up as shown in FIG. 2B and comes into contact with the oblique stopper surface 19a, so that the slide cam 22 does not slide rightward in the horizontal direction. Therefore, the lancing punch 15 is not pushed down.

When the slide cam 22 rises to a position away from the rotary cam 20, the rotary cam 20 is returned to the position shown in FIG. As described above, one step (1) of the press operation of the press die A
Cycle) is completed. The metal material 1 is band-shaped, and the upper mold base 10 is raised from the bottom dead center position to the top dead center position in conjunction with the cycle of the press operation of the press mold A (the vertical movement of the upper mold base 10). Meanwhile, the metal material 1 is moved in the direction of arrow B by a predetermined length (L + α described above). Further, since the metal material 1 has a band shape, the slit 4
It is only necessary to form only one location at a position on the rear side of the box-shaped tank 2 with respect to the moving direction B of.

In order to further facilitate the material flow of the metal material 1 during the drawing of the box-shaped tank 2, as shown in FIG. It is preferable to form a step h at a position on the front side (next process side) in the moving direction B to avoid interference with the rising portion 3 of the scrap portion generated by the previous trimming. The formation of the step h can reliably prevent the rising die 3 of the scrap portion from being pinched by the drawing die 11 with the cushion plate 17.
Therefore, the material flow is not hindered by the pinching of the rising portion 3.

FIG. 7 shows an example of specific dimensions of the embodiment of the present inventor. The thickness t of the strip-shaped metal material 1 is 1.2 m.
m, material width a: 95 mm, width b of slit 4 formed by lancing b: 70 mm, product width (width of tank 2) c: 3
5 mm, product drawing depth d: 31.5 mm, distance e between the product end and the lancing slit 4 e: 12.5 mm, product length f: 91 to 192 mm, and an aluminum alloy was used as the metal material 1. .

In this embodiment, even if the drawing of the box-shaped tank 2 is performed in one step of the pressing operation, the box-shaped tank 2
The box-shaped tank 2 could be molded favorably without tearing occurring at the ceiling corner of the box. (Other Embodiments) In the above-described embodiments, the case where an aluminum alloy is used as the metal material 1 has been described. However, the method of the present invention is applied to a case where drawing is performed using a metal such as a copper alloy or cold rolled steel. Also applicable to

In the above embodiment, the metal material 1
For the material moving direction B,
The case where only one lancing slit 4 is formed at a position on the rear side of the product shape portion has been described.
For each piece, one sheet-shaped metal material 1 is supplied to a drawing device, and a plurality of lancing slits 4 are formed in the periphery of the product shape portion in the one sheet-shaped metal material 1. It may be.

In the above-described embodiment, the projecting and storing operation of the lancing punch 15 for completing the lancing process immediately before the start of the drawing process is performed by the cam 20,
Although the cam mechanism using the cam mechanism 22 is used, the lancing punch 15 may be pushed out and housed using another mechanism, for example, an air cylinder mechanism, instead of the cam mechanism.

Further, the method of the present invention is not limited to the tank 2 of the heating heat exchanger, but can be widely applied to the drawing of metal products in general.
The present invention is not limited to the box shape (rectangular shape) like the tank 2, but can be applied to a cylindrical shape with a ceiling, an elliptical cylindrical shape with a ceiling, a cubic shape, and the like.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of a drawing apparatus of the present invention.

FIGS. 2A to 2D are explanatory views of a lancing process according to the method of the present invention.

FIG. 3 is an explanatory diagram of a lancing process according to the method of the present invention.

FIG. 4 is an explanatory view showing a state at the time of starting drawing by the method of the present invention.

FIG. 5 is an explanatory diagram of edge cutting by the method of the present invention.

FIG. 6 is an enlarged sectional view of a drawing die portion in the drawing apparatus of the present invention.

FIG. 7 is an explanatory view showing specific dimensions in an embodiment of the method of the present invention.

FIG. 8 is a perspective view showing a problem in a conventional pinch trimming method.

FIG. 9 is an explanatory diagram of a process in a conventional drawing method.

[Explanation of symbols]

A: press die, B: material moving direction, 1: metal material, 4 ...
Slit, 11: drawing die, 13: trimming punch, 14: drawing punch, 15: lancing punch, 17: cushion plate, 17a: lancing die, 20, 22: cam.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-154895 (JP, A) JP-A-56-61927 (JP, A) JP-A-59-73030 (JP, U) JP-A-59-73030 99030 (JP, U) Actually open 58-125627 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21D 22/20 B21D 24/16 B21D 28/10 B21D 35/00 B21D 37/08

Claims (3)

(57) [Claims] 1. A drawing apparatus for drawing a thin metal material (1) by a pressing operation of a press die (A) to form a predetermined product shape portion (2), wherein the product shape portion (2) is formed. A lancing machine that performs a lancing process to form a slit (4) around the part where 2) is formed
構部 and (15,17A), the mold portion for drawing performing drawing for forming the product shape portion (2) after the lancing (11, 14)
If, trimming performing edge cutting processing to separate the end face of the product shape portion after the drawing (2) from the metallic material (1)
Operation of the lancing mechanism (13, 17) and the lancing mechanism (15, 17a).
Interlocking mechanism that interlocks with the press operation of the press die (A)
(20, 22), and in the first stage of the press operation of the press die (A),
Lansing mechanism by the interlocking mechanism (20, 22)
(15, 17a) to activate the lancing process
Then, the pressing operation of the press die (A) shifts to the second stage.
And the drawing by the drawing mold portions (11, 14).
And the pressing operation of the press die (A) shifts to the third stage.
And trimming by the trimming mechanism (13).
And the lancing mechanism is configured to form the slit (4).
Lancing punch (15), and the interlocking mechanism unit performs the pressing operation of the press die (A).
An interlocking cam mechanism (20, 22) , wherein the metal blank (1) of the lancing punch (15)
The cam mechanism moves the ejecting operation and the storing operation with respect to
Drawing instrumentation which is characterized in that the (20, 22)
Place . 2. A metal product (1) in the form of a thin plate and a band is drawn by a pressing operation of a press die (A) to form a predetermined product shape portion (2), and the band-shaped metal material (1) is formed. 1) The metal material longitudinal direction (B) is interlocked with the pressing operation of the press die (A) for every predetermined length.
A drawing processing apparatus for moving the metal material (1) in a direction orthogonal to a longitudinal direction (B) of the metal material (1), around a portion where the product shape part (2) is formed, and the metal material (1). Lancing mechanism (15, 17a) for performing a lancing process for forming a slit (4) at a position on the rear side with respect to the moving direction (B )
And a drawing die part (11, 14) for performing drawing processing for forming the product shape part (2) after this lancing processing.
And a trimming process for performing an edge cutting process for separating an end face of the product shape portion (2) from the metal material (1) after the drawing process.
Operation of the lancing mechanism (13, 17) and the lancing mechanism (15, 17a).
Interlocking mechanism that interlocks with the press operation of the press die (A)
(20, 22), and in the first stage of the press operation of the press die (A),
Lansing mechanism by the interlocking mechanism (20, 22)
(15, 17a) to activate the lancing process
Then, the pressing operation of the press die (A) shifts to the second stage.
And the drawing by the drawing mold portions (11, 14).
And the pressing operation of the press die (A) shifts to the third stage.
And trimming by the trimming mechanism (13).
And the lancing mechanism is configured to form the slit (4).
Lancing punch (15), and the interlocking mechanism unit performs the pressing operation of the press die (A).
An interlocking cam mechanism (20, 22) , wherein the metal blank (1) of the lancing punch (15)
The cam mechanism moves the ejecting operation and the storing operation with respect to
Drawing instrumentation which is characterized in that the (20, 22)
Place . 3. The die for drawing is a die (11).
And a punch (14), and an end surface of the die (11) on the metal material (1) side.
The metal material (1) remains after the edge cutting process.
Step (h) to avoid interference with the rising part (3)
Serial be formed in claim 1 or 2, characterized in
On-board drawing equipment.