JP3322689B2 - Progressive processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, when performing a process such as punching, bending and drawing on a work material, performing each process in a set of apparatuses, and sequentially performing the work material in the next process. The present invention relates to a progressive processing apparatus for performing additional processing by pitch-feeding and performing processing in a final step.

[0002]

2. Description of the Related Art Conventionally, when a sheet metal product having a predetermined shape is manufactured by performing a forming process such as punching, bending drawing, and compression on a sheet material made of a structural material such as a steel plate, several steps are required. Is normal. When the production quantity of such sheet metal products is large, each step or stage is individually processed in one processing die, and the workpiece is sequentially sent to the next stage to add processing. Then, means for completing the processing in the final stage is employed. Such a processing die is called a progressive die. For example, since one sheet metal product can be obtained for each stamp of the press, there is an advantage that the efficiency is extremely high.

In the above-mentioned conventional progressive die,
In spite of the advantages of high production speed, short delivery time from the input of the work material to the completion of processing, small work in the middle of press working, and the possibility of mass production by a small number of people, Problems. That is, since a plurality of pairs of punches and dies are incorporated in one mold, the mold structure becomes extremely complicated, requires high-precision mold manufacturing technology, increases the manufacturing period, and increases the manufacturing cost. Is expensive.

Also, when the mold is partially damaged, repaired, or adjusted, it is necessary to disassemble the entire mold, and these operations are complicated, so that much time and man-hours are required. Furthermore, in the case of multi-product small-lot production, when the shape and dimensions of the workpiece are slightly different from each other, if a form is adopted in which a dedicated mold is manufactured each time, the cost of the mold is relatively high. There is a problem that it is not possible to respond to the so-called FMS production system which is increasing.

In order to solve such a problem, the present applicant has already filed an application for a progressive machining apparatus having a simple structure and capable of easily performing a partial adjustment and the like (see, for example, Japanese Patent Application No. 2000-287,197). Hei 2-121760, 2-1
No. 21762). The present invention has been further improved on the premise of these improved inventions.

FIG. 1 is a perspective view of an essential part showing an example of a progressive machining apparatus which is a premise of the present invention. In FIG.
Reference numerals 500 denote processing units, which are arranged on the base 1 at intervals of, for example, 2P (P is the feed pitch of the workpiece) in the feed direction of the workpiece (not shown). Each of these processing units 100 to 500 has one corresponding to a plurality of processing steps.
Although a pair of punches and dies are provided, processing unit 1
00 will be described as an example. Reference numeral 101 denotes a main body, which is formed in a substantially U-shape, and has a dovetail shape at the lower end.
Are integrally formed and can be moved and adjusted in the feed direction of the workpiece by engaging with the dovetail groove 103 provided in the base 1.
In addition, it is formed so as to be able to restrain the movement of the workpiece in the direction perpendicular to the feed direction. 104 is a movement adjusting device, and 105 is a clamp device. Reference numeral 106 denotes a hydraulic cylinder, which is provided at the upper end of the main body 101. A position measuring device 107 is provided on a side surface of the hydraulic cylinder 106.

Reference numeral 108 denotes a cassette which is formed in a substantially U-shape and has a punch or a die (neither is shown) on the upper part.
Are provided so as to be vertically movable, and a punch or a die (not shown) paired with the die is provided at a lower portion, and is detachably provided on the main body 101. The positioning of the cassette 108 is performed by engagement with positioning members 309 and 310 as shown in the processing unit 300. 111 is a clamp screw. That is, the cassette 108 is moved to a positioning member (not shown,
00 (see reference numerals 309, 310).
In addition, a predetermined position can be determined by attaching the clamp screw to the mounting position, and the position can be fixed by tightening the clamp screw 111. After the cassette 108 is fixed, the operating rod (not shown) of the hydraulic cylinder 106 is connected to the vertically movable punch or die.

FIG. 2 is an explanatory view of a main part showing a processing state of a workpiece, in which (a) shows a plane, (b) shows a cross section, and the same parts are denoted by the same reference numerals as those in FIG. Indicated by FIG.
In the above, reference numeral 2 denotes a workpiece, which is intermittently fed at a pitch P in the direction of the arrow. That is, in FIG.
The gap between a pair of punches and a die provided on the cassette 108 (the same applies to other cassettes) is fed by a pitch. 1 and 2, the processing units 100 to 500
Are formed so as to correspond to the processing step of the pilot hole 3, the processing step of the arc-shaped notch 4, and the first to third drawing steps, respectively.

First, the processing unit 100 is provided with a punch and a die for drilling the pilot hole 3, and the pilot hole 3 is located at a position P on the downstream side in the feed direction of the workpiece 2.
And a guide (not shown) that engages the Therefore, each time the processing unit 100 is operated, the pilot holes 3 are sequentially drilled, and the guides engage with the drilled pilot holes 3 to prevent undesired displacement of the workpiece 2 and improve accuracy. Can be held.

Next, in the processing unit 200, the arc-shaped notch 4 is processed. And the processing unit 300
, A first drawing is performed, a bowl-shaped projection 5 is formed on the workpiece 2, and the arc-shaped cut 4 changes its width into an arc-shaped groove 6 by expanding its width. Further, in the processing unit 400, the second drawing and the flange hole 7
Is performed, and the height of the protrusion 5 increases. In the processing unit 500, the third drawing is performed, and the height of the projection 5 is formed to a predetermined size. Although not shown in the drawings, edge cutting and other processes are performed to obtain a predetermined bowl-shaped sheet metal product. In the processing units 200 to 500, by providing a guide that engages with the pilot hole 3, it is needless to say that positioning for ensuring predetermined accuracy is performed.

[0011]

According to the progressive machining apparatus having the above-described structure, the structure is simpler than that of the conventional progressive die, and the production is easy. Although it has the advantage of processing, it has the following problems.

That is, since a plurality of machining units are provided with independent hydraulic cylinders 106 and the like as shown in FIG. 1, independent operation is possible, and standardization and compatibility of common parts are achieved. However, if, for example, a particular processing unit requires a greater driving force or operating load than other processing units, a specially designed hydraulic cylinder must be fitted to that processing unit. Therefore, there is a problem that not only the manufacturing cost becomes large, but also it becomes difficult to maintain balance with other hydraulic cylinders.

On the other hand, it is conceivable to reduce the driving force or the operating load by dividing the processing step into a plurality of parts.
When such means are used, the number of processing steps increases, so that it is necessary to newly install a processing unit corresponding to the processing steps, which causes a problem that not only the cost is increased but also the entire apparatus becomes longer.

The hydraulic oil pressure is the same, for example, 14
It is usual to operate at a high pressure, such as 0 kg / cm ² .
However, it is only necessary to operate at high pressure when processing the above workpieces when performing bending, drawing, punching, or punching. The punch or die is moved closer to or away from the workpiece. During this time, it is not necessary to operate these processing means at a high pressure. On the other hand, a hydraulic cylinder requires a large amount of energy to create a high-pressure hydraulic oil. In the conventional type, it is necessary to always use high-pressure hydraulic oil, and as described above, use a hydraulic cylinder with a larger stroke than necessary. There is a problem that energy consumption is large.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a progressive machining apparatus having a structure capable of selectively increasing a driving force or an operating load of a specific machining unit.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a progressive processing apparatus comprising a plurality of processing units each having a cassette provided with a plurality of processing means detachably mounted on a main body. , A drive unit consisting of a plurality of fluid pressure cylinders connected in series to the processing unit is provided, and the operating part of the piston member interposed in the preceding fluid pressure cylinder can enter the latter fluid pressure cylinder. formed in, and the actuating portion of the piston member is formed so that the supply fluid is closed by entering the subsequent stage of the fluid pressure in the cylinder, a piston member interposed in the fluid pressure cylinder of the last stage of the predetermined A fluid circuit is connected so that a predetermined fluid pressure can be applied to the preceding fluid pressure cylinder when it reaches the position, so that the driving force of the driving means is increased,
The technical means that was adopted.

[0017]

With the above arrangement, when machining a workpiece, particularly when a large driving force is required, the fluid pressure is applied to the fluid pressure cylinder of the preceding stage, so that the piston member is moved into the fluid pressure cylinder of the subsequent stage. And the fluid pressure in the subsequent fluid pressure cylinder is increased, so that the driving force of the driving means can be increased.

[0018]

FIG. 3 is an explanatory view of a sectional configuration of a main part showing an embodiment of the present invention, and the same parts are denoted by the same reference numerals as in FIGS. In FIG. 3, the main body 301 of the processing unit 300 is in a dovetail groove 303 provided in the base 1,
And fixed by a clamp device (not shown). The cassette 308 is provided with a punch 312 formed to be vertically movable, a die 313 paired with the punch 312, and detachably provided on the main body 301. 306
Is a hydraulic cylinder, 307 is a position measuring device.
01 is provided at the upper end.

Next, the hydraulic cylinder 306 is constructed by connecting a first cylinder 306a forming the rear stage and a second cylinder 306b forming the front stage in series, and the pistons 316a and 316b are interposed respectively. The piston rod 317a is connected to the punch 312, and the piston rod 317b is formed so as to be able to enter the first cylinder 306a. The first cylinder 306a and the second cylinder 306b have an oil amount control valve 318 and a switching valve 3 respectively.
Piping 314a, 314b, 315a, 3
A configuration is made such that the hydraulic pressure can be applied simultaneously or individually via 15b. In this case, the pipe 314a is connected to the first cylinder 30 through an opening provided in the piston rod 317b.
6a is formed so that a fluid can be introduced. 320 is a pressure sensor for detecting the oil pressure in the first cylinder 306a. 32
Reference numeral 1 denotes a control device, and the position measurement device 307 and / or
Alternatively, the oil amount control valve 318 and the switching valve 319 can be controlled by a signal from the pressure sensor 320.

FIG. 4 is a hydraulic circuit diagram according to an embodiment of the present invention, and the same parts are denoted by the same reference numerals as in FIG.
FIG. 4 shows an example in which three sets of hydraulic cylinders 306 having the same configuration are provided. However, the piston rod 31
Strokes 7a and 317b can be set differently. In FIG. 4, reference numeral 20 denotes an operation control device, and three control devices 321 are connected so as to be controllable respectively. Then 21
Is a variable displacement hydraulic pump, which is driven by a motor 22. Then, hydraulic oil can be supplied from the oil tank 23 to the hydraulic cylinder 306 via the oil amount control valve 318 and the switching valve 319 by the hydraulic pipe 24. 25 is a return pipe.

Next, the operation of the above configuration will be described with reference to FIGS. When the hydraulic pump 21 is operated via the motor 22, hydraulic oil is supplied from the hydraulic pipe 24 to the hydraulic cylinder 306. The switching valve 319 is in the normal position, and the oil amount control valve 318 is in the closed state. Therefore, the hydraulic oil from the hydraulic pipe 24 passes through the switching valve 319 and passes through the opening of the pipe 314a and the piston rod 317b to the first position.
The piston 316a is supplied to the upper part of the cylinder 306a.
Is lowered, and a drawing process as shown in FIG. 2 is performed on the workpiece by the punch 312 connected to the piston rod 317a.

Next, in the final stage of the drawing process,
When a larger driving force is required, that is, the piston 316a and the piston rod 3 in the first cylinder 306a
When 17a reaches a predetermined position, the position measuring device 30
In response to the detection signal of 7, the oil amount control valve 318 is opened via the control device 321 and the hydraulic oil in the hydraulic pipe 24 is supplied to the second cylinder 306b from the pipe 315a. Therefore, the piston rod 31 connected to the piston 316b
7b enters the first cylinder 306a.

On the other hand, when the piston rod 317b is lowered,
Thus, the opening of the pipe 314a is closed, and the first cylinder 3
The hydraulic oil above 06a is closed. So fixie
Rod 317b into the first cylinder 306a.
To increase the pressure of the hydraulic oil in the first cylinder 306a.
Large relative to the piston rod 317a.
A pressing force can be applied. That is, the piston 316b and
And the cross-sectional area of the piston rod 317b is A₁, A_Two
Then, the first cylinder 30 of the piston rod 317b is
6a, the operation in the first cylinder 306a
Oil pressure is A ₁/ A_TwoIt can be doubled. Obedience
For example, the pressure of the hydraulic oil in the hydraulic pipe 24 is 140 kg /
cm^Two, A₁/ A_Two= 3, the first cylinder 3
The hydraulic oil pressure in the 06a is 420 kg / cm^TwoPressure up to
be able to.

When the piston 316a moves down in the above state, the internal volume of the first cylinder 306a increases. Therefore, unless the piston rod 317b enters the first cylinder 306a by an amount corresponding to the increase in the internal volume, the pressure decreases. Therefore, the first cylinder 3
06a is detected by the pressure sensor 320, and this signal is input to the control device 321 to control the oil amount control valve 318.
Is configured to replenish the oil amount into the second cylinder 306b via the. If the oil amount cannot be replenished even by a single entry of the piston rod 317b, the oil amount control valve 318 is operated to the reverse position via the control device 321 to raise the piston 316b. The operation of introducing hydraulic oil into one cylinder 306a through the opening of the pipe 314a and the piston rod 317b and repeating the operation of re-entering the piston rod 317b is repeated. In this way, the pressure in the first cylinder 306a is controlled by the pressure sensor 320 so as to maintain a predetermined value.

Next, when the punch 312 shown in FIG. 3 reaches the lower stopping point, the signal from the position measuring device 307 causes the oil amount control valve 318 to move to the reverse position via the control device 321.
The supply of hydraulic oil from the pipe 315a is shut off,
The hydraulic oil above the second cylinder 306b is the oil amount control valve 31
The oil is returned from the return pipe 25 shown in FIG. At the same time, the hydraulic oil is supplied from the pipe 315b to below the second cylinder 306b.
6b and the piston rod 317b rise and stop at the upper stopping point. In this case, the hydraulic oil above the first cylinder 306a is in a sealed state until the opening provided in the piston rod 317b faces the opening of the pipe 314a.
The pressure gradually decreases as the piston rod 317b rises, and returns to the initial pressure when the piston rod 317b reaches the upper stopping point. At the same time, the controller 321
The switching valve 319 is in the reverse position through the first cylinder 3
The hydraulic oil above 06a is returned to the oil tank 23 from the return pipe 25 shown in FIG. 4 via the pipe 314a, and at the same time, the hydraulic oil is supplied below the first cylinder 306a via the pipe 314b. Accordingly, the piston 316a shown in FIG. 3 rises and stops at the respective upper stopping points. In this way, the processing in the other processing units is completed, and after each processing means reaches the upper stopping point, the workpiece 2 is pitch-fed to the left in FIG. 2 and the next processing is repeatedly performed. It is.

FIGS. 5 and 6 are enlarged longitudinal sectional views of a main part showing a modification of the hydraulic cylinder 306 shown in FIG. 3, and the same parts are denoted by the same reference numerals as those in FIG. First, when the piston rod 317b is located at a substantially upper stopping point, hydraulic oil is supplied from the pipe 314a to the first cylinder 3 as shown in FIG.
06a. And piston rod 3
The pipe 17 is formed so as to close the opening of the pipe 314a by descending. Therefore, the piston rod 317
The pressure of the hydraulic oil in the first cylinder 306a can be increased by the entry of the b into the first cylinder 306a.

FIG. 6 shows an example in which the opening of the pipe 314a is provided above the first cylinder 306a and the pipe 314a
Is provided with a check valve 319a. With the above configuration, the hydraulic oil supplied to the first cylinder 306a is closed by the lowering of the piston rod 317b, and the pressure of the hydraulic oil can be increased similarly to that shown in FIG.

In this embodiment, an example in which a hydraulic cylinder is used as the driving means of the processing unit has been described. However, it goes without saying that other fluids such as air and water may be generally used as the pressure medium. Although the example in which the hydraulic cylinder has a two-stage configuration has been described, a multi-stage configuration having three or more stages may be used depending on the magnitude of the driving force required for the driving means. In general, when an n-th stage hydraulic cylinder is used, the operating portion of the piston member interposed in the (n-1) th stage hydraulic cylinder is formed so as to be able to enter into the subsequent n-th stage hydraulic cylinder. I just need.

The operating section may be driven by an electromagnet or other mechanical means in place of the hydraulic cylinder at the forefront stage. Further, as the position detecting device, a known position detecting device other than the electric type can be applied. Furthermore, although the example in which the switching valve is used as the control means of the hydraulic circuit has been described, a flow control valve can be used.

[0030]

Since the present invention has the above-described configuration and operation, the following effects can be obtained. (1) Since the multi-stage cylinder is operated only when a large driving force is required during machining, there is no need to separately prepare high-pressure hydraulic oil, and energy consumption can be reduced. (2) Since the operating position of the hydraulic cylinder is controlled for each processing unit, the total amount of hydraulic oil used can be reduced.
The time required for processing can be reduced. (3) Positioning of the upper stopping point, operating point, lower stopping point, and control of other points of change in fluid pressure are possible. For example, only a certain section can be switched to low pressure or high pressure, and the driving force is increased. And extremely efficient processing can be performed. (4) By using a flow control valve for controlling the fluid circuit, the force, direction, and the like can be freely controlled. That is, the digital control of the flow rate enables the machining means to be NC.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an example of a progressive feed processing apparatus as a premise of the present invention.

FIG. 2 is an explanatory view of a main part showing a processing state of a workpiece;
(a) shows a plane and (b) shows a cross section.

FIG. 3 is an explanatory diagram of a cross-sectional configuration of a main part showing an embodiment of the present invention.

FIG. 4 is a hydraulic circuit diagram in the embodiment of the present invention.

FIG. 5 is an enlarged longitudinal sectional view of a main part showing a modification of the hydraulic cylinder 306 shown in FIG.

FIG. 6 is an enlarged longitudinal sectional view of a main part showing a modification of the hydraulic cylinder 306 shown in FIG.

[Explanation of symbols]

100, 200, 300, 400, 500 Processing unit 306 Hydraulic cylinder 306a First cylinder 306b Second cylinder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-256607 (JP, A) JP-A-5-8092 (JP, A) JP-A-57-124600 (JP, A) 114194 (JP, U) JP 46-36237 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B30B 1/36, 13/00

Claims (1)

(57) [Claims] 1. A progressive feeding apparatus comprising a plurality of processing units having a cassette provided with a plurality of processing means removably mounted on a main body, wherein a plurality of stages of fluid pressure cylinders are connected in series to the processing units. And a working part of a piston member interposed in the preceding hydraulic cylinder is formed so as to be able to enter into the following hydraulic cylinder, and the piston part
Actuating portion of the timber is formed so that the feed fluid from <br/> to enter the downstream fluid pressure in the cylinder is closed, the last stage piston member interposed fluid pressure cylinder is in place A progressive machining apparatus characterized in that a fluid circuit is connected so that a predetermined fluid pressure can be applied to a preceding fluid pressure cylinder when the fluid reaches the fluid cylinder, so as to increase the driving force of a driving means.