JPH10216848A - Hydraulic press forming condition setting device and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily set an excellent forming condition by temporarily updating the speed value at the neighborhood of the breaking position and this side speed switching position based on the slide position of the breaking time, and repeating the forming and the updating of the setting condition until the breaking is not caused. SOLUTION: The data of a slide position and a forming speed when breaking is caused is stored in a position and speed setting means 25, as a new forming condition of the slide, this side slide position when generating breaking and the slide speed to be switched in a lower speed than the speed of breaking time are set. When the forming condition of the slide is changed in every test forming, based on the update forming condition setting data and the slide position detecting data, a servo valve command outputting means 27 is acted, the flow rate or the pressure, etc., of the hydraulic oil are controlled, and these are controlled with repeating until without generating of breaking. The forming condition is displayed with a setting displaying means 28 of a liquid crystal display 28, etc. Therefore, the forming condition can easily be set and understood.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to setting of molding conditions for a hydraulic press.

[0002]

2. Description of the Related Art Press machines are classified into a mechanical type and a hydraulic type. Hydraulic presses are used in a wide range of fields because they have an advantage that the vertical movement of a slide can be changed variously according to processing conditions. ing. In order to cope with various molding conditions, various hydraulic press control methods have been conventionally proposed. For example, in Japanese Patent Application Laid-Open No. 08-150500, in order to enable high-precision processing in a process of forming a work using an upper die attached to a slide of a hydraulic press and a lower die attached to a bolster. There has been proposed a method of controlling a slide motion in two modes, a pressure priority mode and a position priority mode. Looking at the operation of the slide in the control method in the pressure priority mode, the slide set to the required stroke descends at a high speed from the upper limit position where the operation is started, and when reaching the forming start point immediately before the work, the predetermined low speed is reached. It descends while shaping the workpiece with. Thereafter, when the pressing force reaches a predetermined value before reaching the lower limit position, the slide is stopped at that position and the pressing force is held for a certain time. On the other hand, in the position priority mode, if the predetermined pressure is not reached even at the lower limit position, an operation of holding the pressure at the lower limit position for a certain period of time is performed, and after forming, it rises at a low speed to the predetermined position, It rises at a high speed to the upper limit position to complete the machining cycle. By controlling the slide motion, it is possible to prevent an excessive force from being applied to the work and the mold, so that high-quality molding can be performed and an effect of preventing damage to the mold can be obtained.

[0003]

In a hydraulic press employing the above-described control method, when setting the molding conditions when performing the molding process, the workpiece is subjected to trial-molding under various conditions. The molding conditions are set while watching the breakage and other molding quality. However, as shown in FIG. 9, some of the products to be formed have a large bending resistance at the time of molding due to a small curvature of the corner shoulder, and a large tension acting on the corner shoulder at the time of molding.
Some of them are easy to break and difficult to set conditions. For such products, the number of trial shots increases and it takes a lot of time to set molding conditions, and the work cultivated through experience and proficiency as a countermeasure to cover the difficulty of setting conditions There is a problem that it depends on the unique technology of the person.

The present invention has been made in view of the above problems, and has been made in consideration of the molding conditions of a hydraulic press which can easily set the molding conditions for a product whose molding conditions are difficult to be set without depending on an operator's unique technology. It is an object to provide a setting device and a method thereof.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a work w is linearly driven in the vertical direction by a hydraulic cylinder 2 for forming a workpiece w. A servo valve 17 for controlling the operation of the slide 4, the hydraulic cylinder 2, a slide position detecting means 8 for detecting a position of the slide 4, and a means for setting an operating speed of the slide 4 and a molding condition such as a speed switching position. And a slide motion at the time of pressurizing and lowering the slide 4 is controlled based on the set speed and position data. Pressure detecting means 1 installed in each of the upper chamber 2-1 and the lower chamber 2-2 for detecting the pressure of the upper chamber 2-1 and the lower chamber 2-2
0, 11; a load detecting means 21 for calculating the pressing force of the slide 4 based on the pressure signals from the pressing force detecting means 10, 11; and a time change of the pressing force detected by the load detecting means 21. The pressure gradient calculating means 22 for calculating the gradient and the pressure gradient at the time of the breakage peculiar to the work w are stored in advance and compared with the pressure gradient calculated by the pressure gradient calculating means 22 at the time of forming the work w to determine the breakage of the work w. A breaking determining means 23 for taking in data of the position of the slide 4 at the time of breaking and the set molding speed of the slide 4; and a position / speed feedback means 24 for feeding back the data obtained by the breaking determining means 23. Based on the feedback data, the molding speed in the vicinity of the breaking position is set to be lower than the current speed setting value. , The position and speed setting means 2 to be newly set the switching position on the front side than the breaking position
5, a servo valve output calculation for calculating an output value for controlling the servo valve 17 based on the molding conditions such as the new speed value and position and the slide 4 position data detected by the slide position detection means 8. Means for receiving the output value from the servo valve output calculating means and transmitting the control command to the servo valve 17;
Captures the position at the time of breakage from the position detection means (8), and sets the position / speed setting means as the molding speed data at the time of breakage.
(25), and the position / speed setting means (25) temporarily determines the speed value near the breaking position and the speed switching position immediately before the breaking position based on the captured position and molding speed data. The molding condition is newly set, and the molding process and the updating of the setting condition are repeated until the break is eliminated, thereby setting the molding condition.

According to the first aspect of the invention, when the slide descends and reaches the molding start position, molding is started at a predetermined molding speed.
The work breaks before the slide is lowered to the lower limit position and molding is completed. This pressure is constantly detected,
The breakage of the work is detected as a time change of the pressing force of the slide, that is, a pressure gradient. The pressure gradient at the time of rupture is stored in advance for the work, and when the pressure gradient of the slide being formed becomes equal to or greater than the stored pressure gradient, it is determined that the work has broken. In addition, the position of the slide is always detected, and the slide position at the time of breakage of the work is taken in together with the forming speed. Further, in order for the workpiece to be formed without breakage, the slide forming speed must be switched to a low speed before breakage occurs. Therefore, based on the data at the time of the above-mentioned fracture, a molding speed of the slide that is slower than the initial setting and a predetermined position before the fracture position at which the slide switches to this speed are set as new molding conditions. In this way, the workpiece is formed at the two-stage forming speed of the slide. When the work is formed under these forming conditions, and breakage occurs again at that time, a lower forming speed and a speed switching position for the slide are calculated again,
New molding conditions are set based on this data. This process is repeated until no more breaks occur. As described above, the new work forming speed of the slide and the forming speed switching position are automatically set from the position of the slide at which the work is broken. Therefore, the molding conditions for obtaining a good molded product without breakage can be automatically obtained, so that even unskilled persons can easily set the molding conditions. In addition, it can contribute to improving the work efficiency of the setting work.

[0007] The invention described in claim 2 is the first invention.
In the hydraulic press forming condition setting device, setting display means (28) for displaying the setting data of the forming conditions and the forming condition data during the forming process is provided.

According to the second aspect of the present invention, since the setting data of the molding condition and the molding condition data during the molding process are displayed, the molding condition can be always grasped and the molding process data at the time of the molding process can be obtained. You can see the change every moment.
Therefore, the efficiency of the molding condition setting operation can be improved.

The invention according to claim 3 is a work w
For controlling the slide motion at the time of pressurizing and lowering the slide 4 which is linearly driven in the vertical direction in order to form the workpiece, and sets the slide operation speed of the slide motion and the speed switching position. In the setting method, the time change (pressure gradient) of the unique pressing force at the time of breaking for each work w is stored in advance, and the work w
The breaking of the work w is detected by comparing the pressure gradient generated at the time of molding with the stored pressure gradient, and when the breaking of the work w is detected, the speed value near the breaking position is made slower than the current speed. A method for setting the molding speed of the slide 4 and its switching position by newly setting the speed switching position on the near side from the breaking position and repeating the molding under the newly set molding conditions until no breaking occurs. I have.

According to the third aspect of the present invention, when the slide descends faster than a predetermined molding speed in the molding process, the work breaks before reaching the lower limit position. This break is determined by the time change of the pressing force of the slide, that is, the pressure gradient, and the position of the slide at the time of the break is also detected. As described above, since the breaking position with respect to the slide forming speed is determined, based on the breaking speed and the sliding position, the slide speed near the breaking position at the next forming process is switched to the sliding speed lower than the previous sliding speed and the breaking speed. Automatically set the position of a predetermined slide before the position. By repeating this molding process until there is no break, molding conditions for obtaining a good molded product without break can be easily set.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a main part of a hydraulic press to which a mold and a work are attached. The hydraulic press 1 is equipped with a C frame 7, a bed 9 is provided below the C frame 7, and the bed 9 holds the bolster 3 at an upper part. A hydraulic cylinder 2 is mounted on the upper part of the C frame 7, and a slide 4 that moves up and down at a position facing the bolster 3 is mounted on a lower end of the hydraulic cylinder 2. When the upper mold d1 attached to the slide 4 is lowered from the upper limit position to the lower limit position by the hydraulic cylinder 2, the work w installed on the lower mold d2 attached on the bolster 3 is pressed and formed. You. When the work w is pressed at the lower limit position of the slide 4 for a predetermined fixed time,
Slide 4 rises to the initial upper limit position,
The cycle is completed.

Further, near the opening of the C frame 7,
An auxiliary frame 5 having a shape similar to the opening is mounted. The lower end of the auxiliary frame 5 is attached to the side surface of the C frame 7 by a pin 6 so that the auxiliary frame 5 can be displaced in the vertical direction. Further, between the upper end side of the auxiliary frame 5 and the rear side of the slide 4, a slide position detecting means 8 constituted by a linear sensor or the like is provided.

The slide position detecting means 8 controls the slide 4 so that the axial direction is parallel to the vertical movement direction of the slide 4.
A sensor rod 8a attached to the rear of the auxiliary frame 5 with the sensor rod 8a inserted.
Consists of a sensor head 8b mounted on the sensor head. With the vertical movement of the slide 4, the sensor rod 8 a moves up and down with respect to the fixed sensor head 8 b, and the position of the slide 4 moves from the top surface of the bolster 3 from the position detection unit incorporated inside the sensor head 8 b. Is detected as a height. The vertical movement of the slide 4 is called a slide motion, and is determined by the molding conditions of the slide 4. This slide motion is represented as a motion curve indicating the relationship between the displacement of the slide 4 and the passage of time.

FIG. 2 shows an example of a motion curve. The vertical axis indicates the position of the slide 4, and the horizontal axis indicates the elapsed time t from the start of the slide 4 at the upper limit position U. Here, the hydraulic press 1 operates the slide 4 between the upper limit position U and the lower limit position L, and the distance between the upper limit position U and the lower limit position L is represented by a stroke length S. At this time, the forming process by the hydraulic press 1 includes a descending process in which the slide 4 moves from the upper limit position U to the lower limit position L, a pressing process in which the position and the pressing force of the slide 4 are held at the lower limit position L, and a lower limit position. And the ascending stroke moving from L to the upper limit position U.

[0015] Further, the descending stroke includes a descending region in which a descending process is performed at a high speed from an upper limit position U (corresponding to a point A on the motion curve) to a predetermined position (corresponding to a point B on the motion curve) just before the start of pressurization. It is represented by a pressure forming region that descends at a low speed (corresponding to the pressing speed) from a predetermined position just before the start of pressure to a lower limit position L (corresponding to a point C on the motion curve). In the pressurization process (corresponding to points C to D on the motion curve), a predetermined pressurization holding time t0 (including a case where t0 = 0) elapses after the lower limit position L is reached. The position and pressure of the slide 4 are maintained. The ascending stroke is a low-speed ascending region in which the ascent is completed at a low speed from the end of the pressurizing stroke (corresponding to point D on the motion curve) to a predetermined position (corresponding to point E on the motion curve).
It is represented by a high-speed ascending region that rises at a high speed from the predetermined position (point E on the motion curve) to the upper limit position U (corresponding to point F on the motion curve). Through such a process, one cycle of the molding process is completed.

It is an object of the present invention to make it possible to appropriately set the molding conditions of the slide 4 represented as such a motion curve for various works. Note that the molding conditions are represented by the speed of the slide 4 represented by the gradient of the motion curve (A, B, C, etc.) of the slide 4 in the above-described motion curve, the pressure holding time t0, and the like. .

The hardware configuration of the hydraulic press forming condition setting device according to the present invention will be described with reference to FIG. In the figure, an upper chamber 2-1 and a lower chamber 2-2 in a hydraulic cylinder 2 include:
Pressurizing force detecting means 10 and 11 comprising pressure sensors for detecting the pressure in the cylinder chamber of the hydraulic cylinder 2 are mounted. The hydraulic pressure controlled by the servo valve 17 and the like is constantly detected by the pressurizing force detecting means 10 and 11, and the detection signal is input to the controller 20. The slide position detecting means 8 as described above is provided near the slide 4, and the position of the slide 4 is always detected. The detected signal is input to the controller 20.

The slide motion setting means 15 instructs the controller 20 on the set values of the molding conditions as described above in order to control the slide motion. The slide motion setting means 15 includes a setting value input unit such as a setting switch and a setting value display unit for displaying input data.

The controller 20 is mainly composed of, for example, a microcomputer having a high-speed arithmetic processing function, and has a central function of the molding condition setting device according to the present invention. The controller 20 converts the input various signals into signals for controlling the servo valve 17 by performing predetermined processing described later, and controls the servo valve 17. The servo valve 17 receiving this control signal controls the pressure, flow rate, and the like of the hydraulic oil that drives the hydraulic cylinder 2. As a result, the position, speed, and force of the slide 4 attached to the hydraulic cylinder 2 are controlled.

The controller 20 is connected to a display 16 comprising, for example, a liquid crystal display screen, a CRT, or an LED for displaying a numerical value.
6 provides information for monitoring the operating status of the hydraulic press, molding condition data, and the like.

FIG. 4 is a block diagram showing a molding condition setting apparatus and method according to the present invention. Pressing force detecting means 1
The pressure signals transmitted from 0 and 11 are
The load detecting means 21 detects the difference between the product of the pressure and pressure receiving area of the hydraulic cylinder upper chamber 2-1 and the product of the pressure and pressure receiving area of the hydraulic cylinder lower chamber 2-2, and Is converted. This pressing force is constantly input to the pressure gradient calculating means 22, and the pressure gradient calculating means 22 monitors the change over time of the pressing force of the slide 4. That is,
Assuming that the pressing force of the slide 4 is P and the pressurizing time is t, the time differential value Pc of the pressing force is represented by the formula “Pc = ΔP / Δt”, and is always processed by the pressure gradient calculating means 22. The value of the time differential value Pc represents the pressure gradient in the pressure-time diagram having the pressing force of the slide 4 on the vertical axis and the pressing time on the horizontal axis, and when the gradient exceeds a certain value, the work w Is determined to be broken.

Here, regarding the phenomenon of breakage,
A description will be given based on FIGS. In the figure, the relationship between the above-mentioned motion curve and the temporal change of the pressing force is shown. That is, the vertical axis represents the position of the slide 4, the horizontal axis represents a motion curve representing the time t after the slide 4 is started at the upper limit position U, and the vertical axis represents the pressing force of the slide 4.
The horizontal axis represents a pair of pressure force diagrams representing the same time t as the motion curve. As shown in FIG. 5, under an appropriate condition of the molding descent speed of the slide 4, the pressing force increases with time, and the plastic deformation of the work w starts from the point of the maximum pressing force Pm. Further, as the slide 4 descends, the plastic deformation of the work w proceeds, and the pressing force of the slide 4 gradually decreases. When the slide 4 reaches the lower limit position L, the pressing force is maintained at a certain set value for the pressurization holding time t0, and then the forming of the work w is completed. On the other hand, FIG. 6 shows a case where the molding lowering speed of the slide 4 is abnormally high.
As the slide 4 descends, the pressure increases rapidly and reaches the maximum pressure Pn. When the slide 4 passes through this point, the plastic deformation of the work w starts. However, since the descending speed of the slide 4 is high, the deformation speed of the work w cannot follow, the work w is broken, and the pressing force of the slide 4 is reduced. Decrease rapidly. Here, this point represented on the pressing force-time curve in FIG. 6 is defined as a breaking point Bp, and the pressing force of the slide 4 at this breaking point is defined as a breaking pressure Pb.

The pressure gradient ΔPb at the above break point Bp
/ Δt is obtained from past empirical data and theoretical values of the work w, and is used as a criterion value for fracture at the start of molding as shown in FIG.
Is stored in the fracture determination means 23 shown in FIG. The value of the pressure gradient ΔP / Δt of the slide 4 calculated by the above-described pressure gradient calculating means 22 is always input to the rupture determining means 23 and is compared with the stored reference value. When the calculated value ΔP / Δt of the pressure gradient of the slide 4 is equal to or larger than the stored reference value ΔPb / Δt of the pressure gradient, the breakage of the workpiece w during forming occurs. It is determined that Then, the data of the position of the slide 4 and the forming speed at the time of occurrence of the rupture are taken into the rupture judging means 23 from the slide position detecting means 8 and the slide motion setting means 15 and transmitted to the position / speed feedback means 24.

The position and molding speed data of the slide 4 at the time of occurrence of the break are obtained by the position / speed feedback means 24 in order to set new molding conditions for the slide 4.
It is transmitted to the position / speed setting means 25. This data is stored in the position / speed setting means 25.

Based on the above data, the position / speed setting means 25 switches the slide 4 to a new molding condition, that is, the position of the slide 4 just before the break occurs, and from that position to a speed lower than the speed value at the time of break. The molding speed of the slide 4 is set. The position of the slide 4 and the molding speed of the slide 4 are calculated by logic incorporated in the position / speed setting means 25.

As described above, when the molding conditions of the slide 4 are changed every time the test molding is performed, the servo valve output calculating means 26 sets new molding condition setting data from the position / speed setting means 25 and the slide position. An output value for controlling a servo valve such as an electromagnetic flow proportional control valve is calculated based on the position detection data of the slide 4 from the detection means 8. The calculated value is output by the servo valve command output means 27 to the servo valve 17 constituting the hydraulic circuit, and the servo valve 17 controls the flow rate, pressure, flow direction, and the like of the hydraulic oil. The hydraulic cylinder 2 is driven by the controlled hydraulic oil, and the slide 4 is controlled along a predetermined motion curve.

The molding conditions are displayed as setting data on the setting display means 28 such as a liquid crystal display, and the molding conditions during operation are also displayed on the setting display means 28 by color, marking, etc. It is easily grasped.

FIG. 7 shows a flowchart for setting the molding conditions. In forming the workpiece w, first, initial values of the forming conditions are set. In step S1,
The initial values of the respective molding conditions are set, and the upper limit position Z00, the molding start position Z01, the lower limit position Z99, and the high speed ascending speed start position Z10 as the slide 4 position data, the high speed descending speed V00, the forming speed as the slide 4 speed data. V
The pressurizing force P99 and the pressurizing holding time t0 are set as the pressurizing ability of the slide 4 at the pressure rising speed V10 and the low speed V10. These setting data are input from the slide motion setting means 15. Note that these initial value data are usually set based on experience data or theoretical values of similar work in the past. When the input of the set values is completed, the molding is started. Under the control of the servo valve 17 that has received the start command, the slide 4 starts descending in step S2. In step S3, a command output value is calculated by the servo valve output calculation means 26 based on the setting data set by the slide motion setting means 15, and further output to the servo valve command output means 27. As a result, the molding start position Z at the high descending speed V00
Reach 01. Next, in step S4, the slide 4 starts to descend at a molding speed V01 from the molding start position Z01. In step S5, a command output value is calculated by the servo valve output calculation means 26 based on the setting data set by the slide motion setting means 15, and further output to the servo valve command output means 27. Thereby, the slide 4 descends toward the lower limit position Z99 while forming the work w. Slide 4 is at lower limit position Z99
In the next step S6, the slide 4 holds the work w with the pressing force P99 for the pressing holding time t0, then rises at the low speed rising speed V10, and reaches the high speed rising speed V00 at the high speed rising speed start position Z10. It is switched and returns to the molding start position Z01. The operation of these slides 4 is controlled by a servo valve 17.

Next, in step S7, based on the pressure gradient in the process of step S5 in which the slide 4 is formed and lowered, the break determination means 23 determines whether or not the work w has broken. As described above, as a method for determining the breakage of the work w, as described above, the pressure gradient of the pressing force at which the work w set to be broken, which is set as the determination reference value in the break determination means 23, is constantly detected during the formation of the work w. The work w is determined to be broken when the detected value is compared with the pressure gradient of the applied pressure of the slide 4 and the detected value is equal to or greater than the determination reference value. If a break has occurred in the work w, the next step S8 is executed, and if no break has occurred, the step S12 is executed. In step 12, the final molding conditions are the initial values set initially.

When a break occurs in the work w, the position of the slide 4 and the forming speed condition of the slide 4 at the time of the break are fetched by the break determination means 23 in step S8. This detection data is transmitted to the position / speed setting unit 25 by the position / speed feedback unit 24. Next, in step S9, molding conditions for the slide 4 that do not cause breakage of the work w are set. In the present situation, the molding start position Z01 and molding speed V01 of the slide 4 set in step S1 are input to the position / speed setting means 25 as initial values of the molding condition setting of the slide 4. The position / speed setting means 25 is provided with a count signal n for the number of times the molding condition has been set, and the count signal n is calculated by the equation "n = n + 1". here,
The count signal n is set to 1 as an initial value, and the value is incremented by one each time step S9 is executed.

FIG. 8 shows a method of setting the molding conditions in step S9. In FIG. 8, the breaking point is indicated by a symbol Bpn in the pressing force-time curve, the pressing force corresponding to that point is indicated by Pbn, and the position of the slide 4 corresponding to the breaking point Bpn is indicated by Zbn. . First, the first time (n =
When the break of 1) is determined, the position Zb1 of the slide 4 at this break point and the forming speed V01 of the slide 4 are input to the position / speed setting means 25 as data. Based on this data, the position / speed setting means 25 sets the molding speed V02 of the slide 4 as a new molding condition and the speed switching position Z at which the slide 4 starts descending at this speed.
02 is set.

The new molding speed V02 for the above slide 4
Is set to a value smaller than the initially set molding speed V01 of the slide 4. The setting of the molding speed V02 is calculated by the position / speed setting means 25 using, for example, an experimental formula obtained from past data or an arithmetic formula composed of logic obtained from theoretical considerations. As an example of the present invention, the initial setting value of the molding speed of the slide 4 is set to a new speed switching position in the middle between the breaking position and the speed switching position. By adopting the method of reducing the number to 2, it was possible to easily carry out molding of a product for which it was difficult to set molding conditions. Note that the method for setting new molding conditions is not limited to this.

The position Z02 of the slide 4 at which the descent is started at the molding speed V02 set above is determined by the breaking point Bp
The position is set based on the position Zb1 of the slide 4 corresponding to No. 1. That is, the position at which the slide 4 is switched from the molding speed V01 to the molding speed V02 is determined by a predetermined correction from the position of the slide 4 at which the workpiece w does not break, that is, the position Zb1 of the slide 4 corresponding to the break point Bp1 in FIG. It is set to a position Z02 that is above by the value α. This switching position Z02 is represented by “Z02 = Zb1 +
α ”, and if this correction value α is set, V02 is automatically set. The value of α can be set by the setting logic obtained by referring to the past experience or the pressure curve registered in the position / speed setting means 25 in the same manner as the setting of the molding speed.

The data of the molding speed V02 and the molding start position Z02 of the slide 4 thus set are stored as additional conditions in the position / speed setting means 25 in the next step S10. In step S11, the data of the molding speed V02 and the molding start position Z02 are displayed on the setting display means 28 together with the molding speed V01 and the molding start position Z01 which are initial value data.

Thereafter, molding is performed again, and the processing from step S2 to step S6 is repeated again under the above two types of molding conditions. If the breakage of the work w occurs in step S7, new molding conditions are used. Steps S8 to S11, which are setting steps, are executed. Further, molding conditions are additionally set, and the molding process is repeated again. This step of setting the forming conditions is repeated until no break occurs, and the setting of the forming conditions is completed in step S12 by determining that no break has occurred in step S7.

The above flow is a case in which the position / speed setting means 25 automatically sets the molding conditions. However, the position of the slide 4 at the time of rupture taken into the rupture judging means 23 displayed on the setting display means 28 is shown. Is read by the operator, the operator calculates the molding speed switching position of the slide 4,
It may be directly input to the speed setting means 25 and set.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a hydraulic press according to the present invention.

FIG. 2 shows an example of a motion curve of a hydraulic press.

FIG. 3 shows a hardware configuration of a molding condition setting device according to the present invention.

FIG. 4 shows a block diagram of a molding condition setting apparatus and method according to the present invention.

FIG. 5 shows a relationship between a motion curve and a temporal change of a pressing force.

FIG. 6 shows a relationship between a motion curve and a temporal change of a pressing force.

FIG. 7 shows an example of a flowchart for setting molding conditions according to the present invention.

FIG. 8 shows a method for setting molding conditions according to the present invention.

FIG. 9 shows an example of a molded product of a hydraulic press.

[Explanation of symbols]

 Reference Signs List 1 hydraulic press 2 hydraulic cylinder 2-1 upper chamber of hydraulic cylinder 2-2 lower chamber of hydraulic cylinder 3 bolster 4 slide d1 upper die d2 lower die w work 5 auxiliary frame 6 pin 7 C frame 8 slide position detecting means 8a sensor rod 8b Sensor head 9 Bed 10, 11 Pressure detection means 15 Slide motion setting means 16 Display 17 Servo valve 20 Controller 21 Load detection means 22 Pressure gradient calculation means 23 Break determination means 24 Position / speed feedback means 25 Position / speed setting means 26 Servo valve output calculation means 27 Servo valve command output means 28 Setting display means

Claims (3)

[Claims] 1. A slide which is linearly driven vertically by a hydraulic cylinder (2) to form a workpiece (w).
(4), a servo valve (17) for controlling the operation of the hydraulic cylinder (2), a slide position detecting means (8) for detecting the position of the slide (4), and the operating speed of the slide (4) and its speed. Means for setting molding conditions such as a switching position, and a slide based on the set speed and position data.
(4) The slide motion at the time of pressurizing and descending is controlled,
In a hydraulic press forming condition setting device for forming a work by a hydraulic press, the hydraulic cylinder (2) is provided in each of an upper chamber (2-1) and a lower chamber (2-2), and the upper chamber ( 2-1) and lower room (2-2)
Pressure detecting means (10) (11) for detecting the pressure of the slide, and load detecting means (21) for calculating the pressing force of the slide (4) based on the pressure signal from the pressing force detecting means (10) (11). )
Pressure gradient calculating means (22) for calculating a time change of the pressing force detected by the load detecting means (21) as a pressure gradient.
In advance, the pressure gradient at the time of breaking peculiar to the work (w) is stored and compared with the pressure gradient calculated by the pressure gradient calculating means (22) at the time of forming the work (w) to determine the breakage of the work (w). At the same time, the breaking judgment means (23) for taking in data of the position of the slide (4) at the time of breaking and the set molding speed of the slide (4), and the data obtained by the breaking judgment means (23) are fed back. A position / speed feedback means (24), based on the fed back data, the molding speed near the breaking position is made lower than the current speed setting value, and the switching position is set to a position closer to the near side than the breaking position. Based on the position / speed setting means (25) set in the above, molding conditions such as the new speed value and position, and the slide (4) position data detected by the slide position detecting means (8). A servo valve output calculating means (26) for calculating an output value for controlling the lubrication valve (17); receiving the output value from the servo valve output calculating means (26), and transmitting the control command to the servo valve (17). Transmitting servo valve command output means (27), wherein the fracture determination means (23) is a position detection means
(8), as well as the speed setting value from the position / speed setting means (25) as the molding speed data at the time of breaking, and the position / speed setting means (25) reads the captured position and molding speed data. Based on the speed value near the breaking position, and a speed switching position before it is newly set temporarily, and the forming process and the updating of the setting conditions are repeated until there is no break, and the forming conditions are set. Hydraulic press molding condition setting device. 2. A molding condition setting device for a hydraulic press according to claim 1, further comprising setting display means for displaying said molding condition setting data and molding condition data during molding. 3. A slide motion at the time of pressurizing and lowering a slide (4) linearly driven in the vertical direction to form a workpiece (w) is controlled. In the method of setting the forming conditions of the hydraulic press for setting the speed switching position, the time change (pressure gradient) of the unique pressing force at the time of breaking for each work (w) is stored in advance, and is generated when the work (w) is formed. A break of the work (w) is detected by comparing the pressure gradient with the stored pressure gradient, and when the break of the work (w) is detected, the speed value near the break position is made lower than the current speed. At the same time, the speed switching position is newly set on the front side of the break position, and molding is performed under the newly set molding conditions and repeated until break does not occur,
A method for setting molding conditions of a hydraulic press, comprising setting a molding speed of a slide (4) and a switching position thereof.