JPH05200450A - Die unit - Google Patents

Abstract

PURPOSE:To provide a die unit which can improve working accuracy by holding the minimum distance between stage surfaces of an upper die stage and a lower die stage during press working at a definite distance as possible through a simple device. CONSTITUTION:A stage elevating means 30 and a driving means 38 to drive the stage elevating means which can be elevated to the present position of the upper die stage surface or the lower die stage surface during the pressing work are provided so that the upper die stage 26 or the lower die stage 28 is equipped independently and vertically movably on the upper die base plate 10 or the lower die base plate 12 and the minimum distance between stage surfaces of the upper die stage 26 and the lower die stage 28 is held to a definite value as possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold device, and more particularly to a mold device used for press working.

[0002]

2. Description of the Related Art A cooling fin used in a heat radiating portion of a heat exchanger such as an automobile cooler or a room cooler has a plurality of through holes with collars provided on a metal plate such as a rectangular aluminum thin plate. The heat radiating portion of the heat exchanger formed by such fins is made of a metal such as copper having good heat conduction in these through holes, in which a large number of fins are polymerized so as to match each of the through holes with collars. The conduit is inserted and integrated. Therefore, the gap between the fins becomes equal to the height of the collar formed around the through hole. Most of such heat exchanger fins are manufactured by the method shown in FIG. 3 proposed in Japanese Patent Publication No. S49-103808. In this method, first, a drilling process and a burring process are performed on the thin metal plate 100 to form a projecting hole 101 surrounded by a projecting piece 102 [step (a)], and then the drilling hole 101 is formed. The projecting piece 102 is extended while "ironing" while enlarging the aperture diameter, and an ironing process is performed to form the collar 104 having a predetermined height [steps (b) and (c)]. Further, the collar 104 extended to a predetermined height is subjected to flare processing in which the front end portion is bent to form the collar 105 [step (d)].

The production of such heat exchanger fins is carried out by using a mold apparatus shown in FIG. Arrow A to this mold device
The metal plate supplied from the direction intermittently moves and is mounted between the vertically moving upper die substrate 10 and the stationary lower die substrate 12, and the die and / or the upper die stage and the lower die stage. Stages 14, 16, 1 with punches
After passing 8 and 20, it is taken out in the direction of arrow B. At this time, in the stage 14, the drilling process and the burring process shown in FIG.
8, the ironing process shown in FIGS. 3B and 3C is performed. In addition, in the stage 20, FIG.
The flare processing shown in (d) is performed. Stage 2
As shown in FIG. 5, the flare punch 30 is fixed to the upper die stage 26 at 0, and the upper die stage 26 descends and is formed on the thin metal plate 10 placed on the lower die stage 28. The front end of the flare punch 30 enters the front end of the collar, and the collar 105 is formed at the front end of the collar. The collar height of the through holes with collars formed in the metal thin plate 10 that has passed through the mold device in this manner is the upper die stage 26 of the stage 20 (hereinafter also referred to as flare stage) on which flare processing is performed. Stage surface and lower mold stage 2
8 is determined by the distance between the stage surfaces and the minimum stage surface.

[0004]

In the past, such a minimum stage surface distance could not be readjusted during pressing after it was once set. By the way, normally, FIG.
The vertical movement of the upper substrate 10 of the mold device shown in FIG. 2 is performed by a hydraulic device, and the oil in the hydraulic device is heated by heat generated during press working and heated up to a constant temperature after a lapse of a predetermined time. To do. The heat applied to the hydraulic device or the like heats the constituent members forming each stage of the mold device shown in FIG. 4 to cause thermal expansion. Therefore, the stage surface of the upper die stage 26 of the stage 20 and the lower die stage 2 shown in FIG.
The minimum inter-stage surface distance from the No. 8 stage surface is a distance different from the initially set distance when a predetermined time has elapsed from the start of fin manufacturing. Therefore, the collar height of the obtained colored through holes differs between the colored through holes obtained at the start of manufacturing and the colored through holes obtained after a predetermined time has elapsed. When a large number of heat exchanger fins with variations in processing accuracy with different color heights are stacked,
There is a drawback that the height of the cooling portion of the finally obtained heat exchanger and the like easily vary.

Such a variation in processing accuracy can be eliminated by cooling the oil circulating in the hydraulic system with a cooler to maintain a constant temperature. However, when the cooler is installed, the pressing apparatus becomes complicated and large. In addition, at the time of initial setting, it may be possible to make an adjustment in advance in consideration of the minimum stage surface distance difference between the start of manufacturing and the lapse of a predetermined time, but it requires considerable skill to make adjustments. Not realistic. Moreover, the processed products obtained by the elapse of a predetermined time still have variations in processing accuracy. Therefore, an object of the present invention is to provide a mold apparatus capable of improving the processing accuracy by keeping the minimum stage surface distance between the upper mold stage and the lower mold stage as constant as possible during press working by a simple device. To provide.

[0006]

In order to achieve the above object, the present inventors provide an upper die stage or a lower die stage, which is mounted on an upper die substrate and a lower die substrate, so as to be able to move up and down independently. At the same time, in order to keep the minimum stage surface distance between the upper mold stage and the lower mold stage as constant as possible, it is possible to move up and down relative to the current position of the upper mold stage surface or the lower mold stage surface during press working. The present invention has been achieved as a result of a study on the idea that it is effective to provide a means and its driving means. That is, according to the present invention, a die and / or a punch are provided on an upper die stage provided on the upper die substrate and a lower die stage provided on the lower die substrate, and the upper die substrate or the lower die substrate is provided. In a die apparatus in which one of the two is moved up and down to perform a press work, a distance sensor arranged on the upper die stage or the lower die stage and a stage side opposed to the stage on which the distance sensor is arranged. Distance measuring means configured to measure the distance between the upper die stage surface and the lower die stage surface when the distance between the stage surfaces is a minimum distance. And, the upper mold stage surface or the lower mold stage surface is moved up and down from the current position,
A stage elevating means for adjusting a minimum stage surface distance between the upper die stage and the lower die stage; and a driving means for driving the stage elevating means based on a distance measurement value of the distance measuring means. It is in the mold equipment.

In the present invention having such a structure, the heat exchange is formed by forming a plurality of collared through holes on a metal thin plate, the periphery of the through holes being surrounded by a collar having a collar portion formed at a tip thereof and having a predetermined height. A mold apparatus for manufacturing a dexterous fin, wherein a minimum stage surface distance between an upper die stage and a lower die stage that constitutes a flare stage in which a collar tip of the through hole with a collar is bent to form a collar portion Being adjustable allows the resulting collar height of the heat exchanger fins to be as constant as possible. Also, the distance measured by the distance measuring means is equal to the minimum stage surface distance,
It is convenient for setting the minimum stage surface distance.
Further, stage elevating means provided between the lower die stage and the lower die substrate is provided on the fixed slant body which is fixed to the lower die substrate side and has an inclined surface on the upper surface, and on the fixed side slant surface of the fixed slant body. When the slidable contact side slidable slidable contact is moved along the fixed side slanted surface, it comprises a movable slant body which moves up and down the lower die stage via an abutting surface abutting the lower surface of the lower die stage. The lower die stage can be easily moved up and down. The drive means is a stepping motor,
It is possible to easily control the amount of elevation of the upper mold stage or the lower mold stage.

[0008]

According to the present invention, when the minimum stage surface distance detected by the distance sensor becomes different from the initially set distance during press working, the driving means is driven to move the upper and lower mold stages by the stage raising and lowering means. Since the stage can be independently moved up and down and the distance between the measured minimum stage surface distances and the initially set distance can be adjusted to be as equal as possible, the processing accuracy of the obtained pressed product can be improved. Further, since the cooler for cooling the oil of the hydraulic device can be made unnecessary, the structure of the press device can be simplified and downsized.

[0009]

The present invention will be described in more detail with reference to the drawings.
FIG. 1 is a partial cross-sectional side view showing an embodiment of the present invention. In FIG. 1, an upper mold substrate 1 that is vertically movable.
The flare stage 20 shown in FIG. 4 is mounted between 0 and the lower die substrate 12 in a stationary state. The flare stage 20 includes an upper die stage 26 fixed to the upper die substrate 10 and a lower die stage 28 mounted to the lower die substrate 12, and the lower die stage 28 and the lower die substrate 12 are arranged.
A stage elevating means 30 is provided between the and.
The stage elevating means 30 has a fixed slant member 32 having a substantially triangular cross section with a lower surface fixed to the upper surface of the lower die substrate 12 and a slant surface formed on the upper surface, and a sliding slidable contact with the fixed slant surface of the fixed slant member 32. When the contact-side slant surface moves along the fixed-side slant surface, the movable slanting body 34 having a substantially triangular cross-section for elevating and lowering the lower die stage 28 via the contact surface that abuts the lower surface of the lower die stage 28 is formed. .. In this embodiment, a plurality of pairs of a fixed slant body 32 and a movable slant body 34 having a substantially triangular cross section are combined between one end surface and the other end surface of the lower die stage 28 to combine the stage elevating means 30. Are formed. In this way, by combining a plurality of pairs of the fixed slant body 32 and the movable slant body 34 whose cross-sectional shapes are substantially triangular, even a wide lower stage 28 can be moved up and down without inclining the stage surface. You can

As shown in FIG. 1, a plurality of the moving slanting members 34 are integrally connected by a connecting member to form a connecting moving slanting member, and the driving means 36 is provided at one end of the connecting moving slanting member. It is connected. A stepping motor 38 is used as the driving means 36 of the present embodiment, and the rotation of the stepping motor 38 is transmitted to a threaded portion 39 formed at the tip of the shaft via a speed reducer 37, and a threaded portion 39.
To rotate. One end of the connecting and moving slant body is screwed to the screw portion 39, and the connecting and moving slant body is fixed in parallel with the lower die substrate 12 by rotation of the screw portion 39.
The lower die stage 28 is moved up and down while moving along the slopes 2. The amount of movement of the connecting / moving slanted body depends on the screw length of the screw portion 39 screwed to the connecting / moving slanting body, and therefore the limit switch unit 4 for limiting the moving amount of the connecting / moving slanted body.
0 is provided at the other end of the connecting and moving slant. The limit switch unit 40 includes a limit switch 41 for limiting the movement of the connecting movement slant to the left in FIG. 1 and a limit switch 4 for limiting the movement of the connecting movement slant to the right.
2 and are installed.

The stepping motor 38 of this embodiment is driven based on the distance measurement data of the minimum stage surface distance between the upper die stage 26 and the lower die stage 28 caused by the distance measuring means 22. The distance measuring means 22 includes an upper die stage 28.
It is composed of a distance sensor 25 using magnetism provided at one end of the measurement piece 24 and a measuring piece 24 fixed to the upper mold substrate 10.
The distance measuring means 22 measures the minimum distance between the distance sensor 25 and the measuring piece 24. In this embodiment, the minimum distance between the distance sensor 25 and the measurement piece 24 is adjusted to be equal to the minimum stage surface distance between the lower die stage 28 and the upper die stage 26.

The mold apparatus shown in FIG. 1 is controlled according to the block diagram shown in FIG. Figure 2
In the above, the minimum stage surface distance L measured by the distance sensor 25 is the micro-presser unit (M
PU) 50, and then the deviation ΔL from the initial set distance L ₀ previously stored in the memory 56 (initial set distance L 0
₀ -minimum stage surface distance L) is calculated in the arithmetic theory circuit (ALU) 52 of the MPU 50. Furthermore, ALU
At 52, the deviation deviation Δ (ΔL) [allowable deviation ΔL ₀ − | deviation ΔL |] between the calculated deviation ΔL and the allowable deviation ΔL ₀ stored in the memory 56 is Is calculated. The value of the deviation deviation Δ (ΔL) calculated in this way is Δ (ΔL) ≧
When it is 0, the minimum stage surface distance L is within the allowable range, and therefore the drive command for the stepping motor 38 is not output from the MPU 50. On the other hand, when the value of the deviation deviation Δ (ΔL) is Δ (ΔL) <0, the minimum stage surface distance L
Is out of the allowable range, the MPU 50 outputs a drive command for the stepping motor 38. The rotation direction and the rotation amount of the stepping motor 38 at that time are determined by the MPU 50 based on the value of the deviation ΔL.

That is, when the value of the deviation ΔL is negative, the minimum stage surface distance L measured by the distance sensor 25 is smaller than the initially set distance L ₀ . Therefore, the lower die stage 28 is lowered in such a manner that the minimum distance L between the measured stage surfaces becomes equal to the initially set distance L ₀ (the connecting movement consisting of a plurality of moving slanted bodies 34 shown in FIG. 1). The stepping motor 38 rotates to the right side of the slanted body. When the value of the deviation ΔL is positive, the minimum stage surface distance L measured by the distance sensor 25 is wider than the initially set distance L ₀ . Therefore, the stepping motor 3 is moved in the direction in which the lower die stage 28 is raised (the connecting movable slant is leftward) so that the distance L between the measured minimum stages is equal to the initially set distance L _0.
8 rotates. Here, if the allowable deviation ΔL ₀ = 0,
The stepping motor 38 is frequently driven, and control of the mold apparatus may be difficult due to control delay or the like. In this embodiment, the allowable deviation ΔL ₀ = 3/100
Although the press working was performed with a thickness of mm, there was no problem in control of the die device and working accuracy of the pressed product. In this way, when the connecting and moving slanted body moves leftward or rightward, the connecting and moving slanted body largely moves due to a malfunction or the like.
When one of the limit switches 41 and 42 of the limit switch unit 40 installed at one end of the connected movable slanted body is activated, the MPU 50 immediately outputs a stop command for the stepping motor 38. The values of the initially set distance L ₀ and the deviation deviation Δ (ΔL) stored in the memory 56 are C
It is displayed on the display device 54 such as RT and can be input from the input device 58 such as a keyboard.

According to the mold apparatus of this embodiment as described above, the minimum stage distance between the upper die stage and the lower die stage can always be adjusted within an allowable range with respect to the initially set distance during press working. The collar height of the heat exchanger fins can be made constant through press working. For this reason, the height of the cooling part of the heat exchanger manufactured by polymerizing the obtained fins can be made substantially constant, and the assembling workability of the heat exchanger can be improved. Further, by storing the initially set distance L ₀ from the input device 58 in the memory 56 before starting the press working, it is possible to set a predetermined minimum stage surface distance, and automation of the troublesome adjustment work of the die device is also possible. It is possible. Further, since the oil cooler circulating through the hydraulic device that moves up and down the upper mold substrate 10 can be omitted, the press device can be downsized.

In the embodiment described above, the stage 20 for flare processing is provided with the function of adjusting the minimum inter-stage distance, but the stages 16, 18 and the like for the ironing process are also adjusted for the minimum inter-stage distance. It may have a function. Further, it goes without saying that a mold apparatus that manufactures a pressed product different from the heat exchanger fin may have a function of adjusting the minimum inter-stage distance.

[0016]

According to the present invention, it is possible to improve the processing accuracy of a pressed product obtained even if the cooling device for the circulating oil of the hydraulic device for vertically moving the upper die stage or the lower die stage is omitted. Therefore, the structure of the press device can be simplified and downsized.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing an embodiment of the present invention.

FIG. 2 is a block diagram for explaining a control method of the mold device.

FIG. 3 is an explanatory diagram illustrating a method of manufacturing a heat exchanger fin.

FIG. 4 is a side view illustrating a mold device that manufactures the heat exchanger fins shown in FIG. 3.

5 is a partial cross-sectional view showing a processed state of the stage 20 shown in FIG.

[Explanation of symbols]

 10 Upper Mold Substrate 12 Lower Mold Substrate 22 Distance Measuring Means 25 Distance Sensor 26 Upper Mold Stage 28 Lower Mold Stage 30 Stage Lifting Means 32 Fixed Slopes 34 Moving Slopes 36 Driving Means 38 Stepping Motors

Claims (5)

[Claims] 1. A die and / or a punch are disposed on an upper die stage provided on an upper die substrate and a lower die stage provided on a lower die substrate, and the die and / or punch are provided on the upper die substrate or the lower die substrate. In a mold apparatus in which one is moved up and down to perform press working, a distance sensor disposed on the upper die stage or the lower die stage and a stage side facing the stage on which the distance sensor is disposed are disposed. And a distance measuring unit configured to measure a distance between the upper mold stage surface and the lower mold stage surface when the distance between the stage surfaces is a minimum distance. A stage elevating means for elevating or lowering the upper die stage surface or the lower die stage surface from the current position to adjust the minimum stage surface distance between the upper die stage and the lower die stage; The stay based on the distance value And a driving means for driving the raising and lowering means. 2. A heat exchanger fin comprising a thin metal plate having a plurality of through holes with collars, the periphery of the through holes being surrounded by a collar having a collar portion formed at a tip and having a predetermined height. In a mold apparatus, a minimum stage surface distance between an upper mold stage and a lower mold stage, which constitutes a flare stage in which a collar end of the through hole with a collar is bent to form a collar portion, can be adjusted. Mold device described. 3. The mold apparatus according to claim 1, wherein the distance measured by the distance measuring means is equal to the minimum stage surface distance. 4. A fixed slant body having a stage elevating means provided between a lower die stage and a lower die substrate, the fixed slant body being fixed to the lower die substrate and having an inclined surface on the upper surface, and the fixed side of the fixed slant body. 2. The mold apparatus according to claim 1, further comprising a movable slant body which slidably contacts the slant surface and moves up and down the lower die stage when the slidable contact slant surface moves along the fixed slant surface. 5. The mold apparatus according to claim 1, wherein the driving means is a stepping motor.