JPH0724956B2 - Stroke control method for press machine - Google Patents

Description

Description: [Object of the invention] (Field of industrial application) The present invention relates to a stroke control method of a press machine capable of performing punching with low vibration or noise and with high efficiency.

(Prior Art) As disclosed in Japanese Patent Laid-Open No. 62-183919 (stroke control method for a plate material processing machine), during punching of a press machine, extremely large vibration or noise is generated during processing.

For example, in the turret punch press experiment, the vibration is about 75 dB at a position 1 m away from the punch center and about 58 dB at a position 10 m away from the punch center, and the relationship between the distance and the vibration is substantially linear during this period. The noise is about 98 dB at a position 10 m away from the punch center and about 75 dB at a position 40 m away from the punch center, and the relationship between the distance and the noise is substantially linear during this time.

These vibrations or noises are
It is generated between the stroke operating portion and the plate member, the bending of the frame, and the like, and the amount thereof increases as the stroke speed increases.

On the other hand, according to the environmental regulation standards, for example, the vibration regulation value in Tokyo is 60 dB at night (PM7: 00 to AM8: 00) and daytime (AM8: 00 to PM7: 00) in Type 1 and Type 2 residences. ) 65dB
In the industrial area, it is 65 dB at night and 70 dB during daytime. In Tokyo, the noise regulation values are 45 dB at night and 50 dB during daytime in Type 1 residential areas, 45 dB at night and 50 dB during daytime in Type 2 residential areas, and 50 to 55 dB at night and 60 dB during daytime in semi-industrial areas. 55-60d at night in industrial areas
B, 70 dB in the daytime.

Therefore, the plate material processing machine having the stroke operation part, especially the press machine, is largely restricted in terms of use in terms of time and area, and in a region with strict regulations, it is unavoidable to attach a large vibration isolator or soundproof device. It is in.

In view of this, the above-mentioned publication discloses a technique for optimizing the punching speed, performing machining with low vibration or noise and high efficiency.

(Problems to be Solved by the Invention) However, the principle of generation of vibration or noise in punching is complicated, and an appropriate value for the punching speed can only be obtained by experiments. Therefore, conventionally, the appropriate value of the punching speed has been determined by trial punching for each type, plate thickness and shape of the work piece or for each work unit. Therefore, conventionally, it takes a lot of labor and time to generate an appropriate speed, and the overall work efficiency is reduced.

Therefore, the present invention is based on the knowledge that the punching pressure of the amount of vibration or noise is substantially uniquely determined, and easily generates an appropriate machining pattern with low vibration or noise and high efficiency, An object of the present invention is to provide a control method for a press machine that can improve efficiency.

[Structure of the Invention] (Means for Solving the Problems) The present invention has been made in view of the conventional problems as described above, and the method of the present invention is the starting end of a punch that is reciprocated by the operation of a cylinder. The speed of the approaching section from the position to the surface position of the plate material on the die, the speed of the punching period from the surface position of the plate material to the position on the lower side by a predetermined distance, and the speed below the lower surface of the plate material from the punching section. Stroke control method of a press machine for controlling the stroke of the punch according to the speed of the punching section reaching the position, the speed of the returning section from the position of the punching section to the starting end position, and the processing pattern set to a desired speed, respectively. Then, when performing the trial punching by lowering the punch at a relatively low speed,
The position where the punch contacts the surface of the plate and the maximum punching pressure are detected by a position detector and a pressure detector, and the punching section is set based on the detected surface position of the plate, and a predetermined punching is performed. The desired punching speed of the punching section is extracted based on the maximum punching pressure from the table data in which the data of the punching speed capable of suppressing the vibration or the noise with respect to the pushing pressure is kept below a predetermined value. This is a stroke control method for a press machine in which a working pattern is generated according to a set punching section and punching speed, and stroke control of the punch is performed according to the generated working pattern.

[Action]

As is apparent from the above configuration, the machining pattern is divided into an approach section, a punching section, a punching section and a return section, and the punching speed in each section is individually set.

When performing punch stroke control according to the above processing pattern, the plate material is experimentally punched to detect the surface position of the plate material and the maximum punching pressure is detected, and the punching section is set based on the detected surface position. In addition, based on the maximum punching pressure detected, the punching speed data that can suppress the vibration or noise below a predetermined value for a given punching pressure is set in advance so that the vibration or noise falls below a predetermined value. This is a method in which the punching speed is extracted from the stored table data to generate a machining pattern, and the stroke of the punch is controlled according to the generated machining pattern.

Therefore, the machining pattern can be generated by arbitrarily selecting the punching speed from the table data based on the detected maximum punching pressure so that the noise or vibration becomes equal to or less than the desired value. Therefore, it is easy to comply with the environmental regulation standards.

(Embodiment) FIG. 1 is an explanatory view of a model of a cylinder type press machine and its control device.

As shown in the figure, a punch 3 and a die 5 are arranged above and below the plate material 1 having a thickness d. The punch 3 is connected to a ram 7, and the ram 7 is driven in a vertical (Z) direction by a pit 11 in a cylinder 9.

An encoder 13 is attached below the cylinder 9,
A pulse signal PLS proportional to the moving speed is output as the ram 7 moves up and down.

A servo valve 15 is connected to the upper chamber and the lower chamber of the cylinder 9 via oil passages OL ₁ and OL _2, and the pressure oil of an oil pump 17 is supplied to the upper chamber of the cylinder 7 based on a switching operation of the valve 15. Alternatively, by supplying to the lower chamber side, the ram 7 is driven up and down at a predetermined speed.

A pressure detector 19 is connected to the oil passage OL _{1 so} that the pressing force P at the time of punching is detected.

On the other hand, a servo valve control unit 23 is connected to the main control unit 21, and the servo control is performed according to the machining pattern set by the main control unit 21.
Fifteen are to be controlled.

The output signal of the encoder 13 is input to the position / speed detector 25, and the lower end position (Z) of the punch 3 and its moving speed V are detected here. The position and velocity signals Z and V are fed back to the servo valve control section 23 so that the servo valve 15 can be controlled in an open or closed loop.

Further, in this example, the position / speed detection unit 25 and the main control unit
A processing pattern generation unit 27 connected to the pressure detector 19 is arranged between 21 and a data storage unit 29 is connected thereto.

The data storage unit 29 stores data necessary for obtaining an appropriate machining pattern from the data Z and P obtained by the test punching work.

Next, the operation of the pressing mechanism will be described with reference to FIGS. 2, 3, and 4.

Now, as shown in the position / time (Z · t) diagram (solid line) in FIG. 2, the punch 3 is lowered from the upper end point Zu toward the lower end point Z _D at a relatively small speed V ₁ , and then A trial punching process shall be performed by returning from the lower end point Z _D to the upper end point Z _U at a relatively large speed V ₂ .

Then, the punch 3 comes into contact with the plate material 1 at the surface position Z ₁ of the plate material 1, and the pressure detector 19 detects the punching pressure P as shown in the pressure-time (P · t) diagram (broken line). To do.

Therefore, the processing pattern generation unit 27 reads the surface position Z ₁ of the plate 1 from the position of the punch 3 at the time of rising of the pressure P, and also reads the maximum punching pressure P _M thereafter, and these data Z ₁ , P _M Memorize

FIG. 3 is a position / time diagram showing a procedure for generating a highly efficient machining pattern with less vibration or noise from the data Z ₁ and P _M.

As shown in the figure, the machining pattern PAT is
_A , V in the punching section, V _B , scrap (product in the case of blanking) V _C in the punching section, and V _D in the return section.

The approach section is a distance smaller than the top surface of the plate 1 (for example, 2m
m) is set at the start position Z ₂ on the upper side, and the speed V _A is set at a high speed.

The punching section is set at the same distance as the thickness of the plate material having a thickness of 2 mm or less, and at the position Z ₂ below the upper surface of the plate material 1 by a predetermined distance (for example, 2 mm) for the plate material having a thickness of 2 mm or more, and the speed V _B is selected from the table data in FIG.

The table data shown in FIG. 4 shows speed values at which vibration or noise can be suppressed below the legally regulated value for a predetermined punching pressure. This punching speed data is
It was created by experiment and is classified by material and time zone.

The embossing section is defined from the punching end point to a position Z ₄ defined a predetermined distance (for example, 2 mm) below the lower portion of the plate material 1, and the velocity V _C is determined to be high.

The return section is defined from the launching end Z ₄ to the starting end Z ₂ , and the speed V _D is set to the highest speed.

The machining pattern PAT generated as described above is transferred to the main control unit 21, and the servo valve 15 is controlled in an open loop by this pattern PAT.

Therefore, the punch 3 is driven in the proper machining pattern as shown in FIG. 3, and the machining with low vibration or noise and high efficiency is continued.

In this example, the boundary between the approaching section and the punching section was made to coincide with the upper surface position of the plate material 1.
Since there is a slight delay at 15, the tip of the punch 3 does not hit the upper surface of the plate material strongly, so that no loud noise is generated.

In the above-described embodiment, only the punching speed V _B is extracted from the table data to generate the processing pattern PAT. However, the table data of the processing pattern for each thickness d is prepared in advance,
The processing pattern itself may be selected from the table data.

The present invention is not limited to the above embodiments, but can be carried out in an appropriate mode by appropriate design changes.

[Effects of the Invention] As will be understood from the description of the above embodiments, in short, the present invention relates to the punch (3) which is reciprocated by the operation of the cylinder (9) from the starting end position (Z ₂ ) to the die ( 5) The velocity (V _A ) of the approaching section to the surface position (Z ₁ ) of the plate material (1) and the position (Z ₃ ) below the surface position (Z ₁ ) of the plate material (1) by a predetermined distance. The speed of the punching period (V _B )
The speed (V _C ) of the punching section from the punching section to the position (Z ₄ ) below the lower surface of the plate (1), and the position of the punching section (Z ₄ ) to the start position (Z _2). ), The stroke (V _D ) of the return section and the machining pattern (PAT) set to desired speeds respectively are used to control the stroke of the punch (3). The position where the punch (3) contacts the surface of the plate (1) and the maximum punching pressure (P _M ) when the test punching is performed by lowering at a relatively low speed (V ₁ ) Detecting with a detector and a pressure detector, the punching section can be set based on the detected surface position of the plate material, and vibration or noise can be suppressed below a predetermined value for a predetermined punching pressure. Table data pre-stored with pull-out speed data Extract the desired punching speed (V _B ) in the punching section based on the maximum punching pressure (P _M ) from above, and generate a machining pattern according to the set punching section and punching speed (V _B ). Then, it is a stroke control method of the press machine for performing stroke control of the punch (3) according to the generated processing pattern.

As is apparent from the above configuration, in the present invention, the machining pattern is divided into an approach section, a punching section, a punching section and a returning section, and the speed of the punch 3 in each section is set individually. is there.

When the stroke of the punch 3 is controlled according to the above processing pattern, the plate material 1 is experimentally ejected to detect the surface position of the plate material 1 and the maximum punching pressure P _M , and based on the detected surface position. To set the punching interval and keep the vibration or noise below a specified value for a given punching pressure so that the vibration or noise falls below a specified value based on the detected maximum punching pressure P _M. This is a method in which the punching speed V _B is extracted from the table data in which the punching speed data that can be obtained is stored in advance, a machining pattern is generated, and the punch stroke control is performed according to the generated machining pattern.

Therefore, the punching speed V _B can be arbitrarily selected from the table data based on the detected maximum punching pressure P _M so that the noise or vibration becomes equal to or less than a desired value, and a machining pattern can be generated. It is easy to comply with environmental regulation standards depending on the time of day.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a model of a cylinder type press machine and its control device, and FIGS. 2, 3, and 4 are explanatory diagrams showing its operation. 3 …… Punch, 7 …… Cylinder 15 …… Servo valve 27 …… Machining pattern generator Z …… Position, P …… Pressure P _M …… Maximum applied pressure PAT …… Machining pattern V _A … Approaching section Speed V _B …… Punching speed V _C …… Punching speed V _D …… Returning speed

Claims (1)

[Claims] 1. An approaching section of a punch (3) reciprocated by the operation of a cylinder (9) from a starting end position (Z ₂ ) to a surface position (Z ₁ ) of a plate material (1) on a die (5). speed and (V _a), and sheet velocity (V _B) between punch抜期extending surface position from (Z ₁₎ a predetermined distance of the lower position (Z ₃₎ of (1),
The speed (V _C ) of the punching section from the punching section to the position (Z ₄ ) below the lower surface of the plate (1), and the position of the punching section (Z ₄ ) to the start position (Z _2). ), The stroke (V _D ) of the return section and the machining pattern (PAT) set to desired speeds respectively are used to control the stroke of the punch (3). The position where the punch (3) contacts the surface of the plate (1) and the maximum punching pressure (P _M ) when the test punching is performed by lowering at a relatively low speed (V ₁ ) Detecting with a detector and a pressure detector, the punching section can be set based on the detected surface position of the plate material, and vibration or noise can be suppressed below a predetermined value for a predetermined punching pressure. Table data pre-stored with pull-out speed data The desired punching speed (V _B ) of the punching section is extracted from the above based on the maximum punching pressure (P _M ), and the machining pattern is generated according to the set punching section and punching speed (V _B ). Then, the stroke control method of the press machine is characterized in that the stroke control of the punch (3) is performed according to the generated processing pattern.