JP2007130689A - Press machine having zero point correction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press machine having a zero point correction device capable of considerably enhancing the pressing accuracy of a work. <P>SOLUTION: The press machine having the zero point correction device comprises a pressure generation means 3 for generating the pressure, a conversion mechanism means A for converting the pressure by the pressure generation means 3 into the linear motion of a pressing ram 1, a position detection means 7 for detecting the position data related to the linear motion of the ram 1, a pressing condition setting means 8 for setting the pressing condition, a pressing condition storage means 9 for temporarily storing the pressing condition, a pressure detection means 10 for detecting the pressure, a zero point correction means 11 for commanding the zero point correction at a pressing origin under the pressing condition, a reference value storage means 12 for storing the position data when the press applies the pressure at the pressing origin corresponding to the command signal as the reference value of the pressing condition, and a correction control data storage means 13 for newly storing the correction control data such as the stop position by the reference value and the pressing condition as the pressing origin with respect to the origin as the initially set position in place of the data on the pressing condition. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a press machine provided with a zero point correction device capable of remarkably improving the press accuracy of a workpiece.

  Conventionally, when a workpiece is pressed by a press machine, the press main body is distorted by the applied pressure. Specifically, as shown in FIG. 4, in the case of a so-called open type, in which one post is provided behind the pressurizing unit and a base is provided in front of the post, the cantilever is A large distortion occurs due to the applied pressure.

  However, when the press machine has a gate shape, there is an advantage that even if pressure is applied, there is an advantage that distortion hardly occurs. However, this time, the gate frame part becomes an obstacle when working. There were drawbacks. Conventionally, corrections have been proposed in order to cope with these problems. The target of these correction values is to try to correct “strain” caused by the cantilever structure as an important part of the mechanism. In addition, corrections that differ from machine to machine, such as the amount of play, are not included.

  In order to solve this problem, the applicant has also filed an application in Japanese Patent Application No. 5-28404. This application is a “press machine including a correction device”, but more accuracy than this is often required. In the prior application, a correction value corresponding to the pressing condition is stored in advance and correction data is to be corrected when pressure is generated, but this is not perfect. In addition, there is no press machine that takes into account differences due to processing conditions or the occurrence of pressure applied due to the workpiece, and therefore a device for correcting this is desired.

Therefore, as a result of earnest and research to solve the above problems, the inventor has applied the invention to a pressure generating means for generating a pressing force, and a linear motion of a press ram by the pressing force generating means. Conversion mechanism means for conversion, position detection means for detecting position data related to linear motion of the ram, origin position which is the initial set position of the upper ram, and attachment / detachment of the workpiece lowered from the origin position A press including a set point for the position of the ram to perform the position, a position pressing position immediately before the ram hits the work piece, a position setting including a stop position of the ram that ends the pressing operation, and a pressing force Press condition setting means for setting the conditions, press condition storage means for temporarily storing the press conditions, pressure detection means for detecting the pressure, and whether the base condition or the gauge reference is set for the set press conditions. zero When determining whether or not to make a correction and using it as a gauge reference, the gauge corresponding to the workpiece W is used as a reference, and the gauge reference position is set to the gauge position under the press conditions. Zero point correction means for instructing point correction and a gauge position using a gauge corresponding to the workpiece W corresponding to the command signal as a new processing origin with respect to the original position which is the initial set position under press conditions Reference value storage means for storing position data at the time of pressing pressure as a reference value for press conditions, and correction control for storing correction control data such as a stop position in place of the press conditions according to the reference value and the press conditions The problem was solved by using a press machine equipped with a zero point correction device characterized by comprising data storage means.
Further, the present invention detects a pressure generation means for generating a pressure force, a conversion mechanism means for converting the pressure generation means into a linear motion of a press ram, and position data relating to the linear motion of the ram. A position detection means, an origin position which is an initial set position of the upper ram, a position setting height corresponding to the position of the ram for attaching and detaching the workpiece lowered from the origin position, and the ram is a workpiece. A press condition setting means for setting a press condition including a position setting consisting of a position pressurizing position immediately before hitting and a stop position of the ram that terminates the press operation, and a pressing force, and a press that temporarily stores the press condition A condition storage means, a pressure detection means for detecting a pressure force, and whether or not to perform a gauge reference zero point correction for the set press condition, and if the gauge reference is used, the workpiece Equivalent to W In order to use the gauge reference position as the gauge position under the press condition, the zero point correction means for commanding the zero point correction at the machining origin, and the workpiece W corresponding to the command signal A reference value storage means for storing the position data at the time of pressing pressure under the press condition as a reference value of the press condition, with the gauge position using the gauge to be newly set as the processing origin with respect to the origin which is the initial set position; A press machine equipped with a zero point correction device, comprising correction control data storage means for storing correction control data such as a stop position in place of the press conditions according to the reference value and the press conditions; This solved the problem.

In the present invention, since the press machine having the above configuration is used, first, the stop position of the press work is not affected by the distortion or the like of the press machine, so that there is a great advantage that the processing accuracy can be greatly improved. .
This effect will be described in detail. Zero point correction means 11 for instructing zero point correction at the machining origin under the press conditions, and position data at the time of pressing force at the machining origin corresponding to the command signal as the press conditions. Pressing under the press condition using the reference value storage means 12 for storing as a reference value, and the correction control data such as the stop position based on the reference value and the press condition as a new processing origin relative to the origin which is the initial set position Since it has correction control data storage means 13 for acquiring position data at the time of pressurization and storing it in place of the press conditions, it is based on the amount of strain when the pressure is actually applied, and this is the processing origin Thus, the distortion amount can be zero-corrected, and extremely accurate control can be performed.

  In particular, position data at the time of pressing force is obtained each time, but position data corresponding to the appropriate pressing force can be obtained, and distortion correction corresponding to the pressing force can also be performed. In other words, there is an advantage that accurate correction can be performed at any applied pressure.

  As the reference value, the base position is used as a reference, or a gauge corresponding to the workpiece W is used as a reference, and the distortion amount can be corrected almost perfectly. Specifically, although it differs depending on the applied pressure, on average, a strain amount of hundreds of tens of micrometers is generated in the workpiece W. However, in the present invention, processing that simply causes an error within 1 micron. Can provide accuracy. The other structure is the same as that of Claim 1, and there exists an effect equivalent to this.

In particular, when the gauge corresponding to the workpiece W is used as a reference, there is an effect that the distortion amount can be corrected almost perfectly at the gauge reference position.
Accordingly, there is an advantage that the reference position can be changed and set according to the work needs.

A pressure generation means for generating a pressure force, a conversion mechanism means for converting the pressure generation means into a linear motion of a press ram, a position detection means for detecting position data related to the linear motion of the ram, The origin position, which is the initial set position of the upper ram, the height setting point for the position of the ram for attaching and removing the workpiece that has been lowered from the origin position, and the position just before the ram hits the workpiece. In a press machine equipped with a press condition setting means for setting a press condition including a press position including a pressure position, a stop position of a ram that ends the press operation, and a pressurizing force,
Press condition storage means for temporarily storing press conditions, pressure detection means for detecting pressure, zero point correction means for commanding zero point correction at the processing origin, and position at the time of press pressure under the press conditions By providing a reference value storage means for storing data as a reference value for press conditions, and a correction control data storage means,
Judgment is made on whether to perform zero point correction for base press or gauge reference for the set press conditions. When using the gauge as a reference, the gauge corresponding to the workpiece W is used as a reference, and the gauge reference position Is set to the gauge position under the press condition, the zero point correction at the machining origin is commanded, and the gauge position using the gauge corresponding to the workpiece W in response to the command signal is set to the origin which is the initial set position. On the other hand, the position data at the time of pressing force under the press condition is stored as a reference value of the press condition as a new processing origin, and correction control data such as a stop position is stored in the press condition according to the reference value and the press condition. Instead of storing, the zero point is corrected.

  Embodiments of the present invention will be described below with reference to the drawings. A press machine according to the present invention, as shown in FIG. 3 and FIG. The ram 1, a ball screw 2 for raising and lowering the ram 1, and an electric motor 3 a as the pressurizing force generating means 3 are provided in the head frame of the casing 4.

  First, as shown in FIGS. 3 and 4, the structure of the ram 1 is formed in a cylindrical body, and specifically in the axial direction inside the cylindrical main body 1 a formed in a cylindrical shape. Is formed in the hollow portion, and the screw shaft 2a of the ball screw 2 can be inserted into the hollow portion. The nut body 2b of the ball screw 2 is fixed. A pressing body 1b is configured to be attachable to the lowermost portion of the cylindrical main body 1a. In actuality, the pressing body 1b abuts on the workpiece W and applies an appropriate pressure. .

A cylindrical guide 5 is provided so as to wrap the outer peripheral side surface of the cylindrical main body 1a. The cylindrical guide 5 is fixed in the casing 4, and the ram 1 is configured to be movable up and down along the cylindrical guide 5. The ram 1 is provided with an anti-sway guide 6 so as not to rotate on a plane orthogonal to the axial direction. Specifically, as shown in FIGS. 3 and 4, the steady rest guide 6 includes a steady rest 6 a, a guide portion 6 b, and a connecting plate 6 c, and the steady rest 6 a is above the lower end portion of the ram 1. Further, it is provided via a connecting plate 6 c so as to be parallel to the ram 1, and the steady rest 6 a moves up and down as the ram 1 moves up and down.

  Further, a guide portion 6b for allowing the steady rest rod 6a to pass through a predetermined location is fixed in the casing 4, and the steady rest rod 6a is raised and lowered along the guide portion 6b. When 1 moves in the up-down direction, it is configured not to idle in the cylindrical guide 5.

  The conversion mechanism means A for converting the rotational force generated by the applied pressure generating means 3 into the linear motion of the press ram 1 by a screw mechanism includes the ball screw 2, the screw shaft 2a, the nut body 2b, the cylindrical guide 5 and the like. It is configured. The position detecting means 7 is configured to detect position data related to the linear motion of the ram 1 as a value of the encoder 7a. That is, the encoder 7a is configured as the position detecting means 7.

  The press condition setting means 8 includes an input device 8a and a display device 8b. Specifically, the input device 8a for setting the press conditions and information from the input device 8a are transferred to the central processing unit (CPU) 17, and the central processing unit 17 sends information to the display device 8b according to this information. And press conditions are displayed. The input device 8a is provided with a zero point correction command switch 8a. The press condition storage means (RAM 1) 9 is a memory for temporarily storing the press conditions input by the press condition setting means 8, and the actual press operation is performed according to the stored program.

  The pressure detection means 10 is provided to detect the pressure. The zero point correcting means 11 commands zero point correction at the processing origin under the press conditions, and is performed by turning on the zero point correction command switch 8a. The reference value storage means (RAM2) 12 stores position data at the time of pressing force at the processing origin as a reference value for the press condition in response to a zero point correction command signal.

  Further, the correction control data storage means 13 stores correction control data such as a stop position in place of the press condition according to the reference value and the press condition. The stop position storage means (RAM 3) 14 detects position data with respect to the stop position by the position detection means 7, and this is stored as stop position data. The press machine operating means 15 is composed of a switch for starting a press operation, and the state of the switch is read by the central processing unit 17.

  The pressure generation control means 16 controls the pressure generation means 3 based on information from the central processing unit 17. Further, the information such as the pressure and position from the pressure generating means 3 is transferred to the central processing unit 17. Specifically, an electric motor 3a exists as the pressurizing force generating means 3, and an encoder 7a for detecting a reference position of the ram 1 is connected to the electric motor 3a.

  The central processing unit (CPU) 17 stores the initial position of the ram, the corresponding height setting point of the ram 1, the switching point from high speed to low speed, the set pressure generation point, and the fixed position stop point. It has a function of detecting that the ram 1 has arrived at each position and instructing the motor 3a to change the setting of the rotational speed and current value, and to interrupt and invert.

The operation of the embodiment of the present invention will be described below. First, as shown in the flowchart of FIG. 2, the operation position condition of the ram 1, that is, the press condition is input (see S1).
. The operation position condition of the ram 1 includes an origin position (an initial setting position of the ram 1), a corresponding height setting point of the ram 1 (a position of the ram 1 for mounting and removing the workpiece W), a pressurizing position ( The position immediately before the ram 1 hits the workpiece W) and the stop position (the position of the ram 1 at which the press operation is terminated) are set while pressing the actual workpiece W. . Then, it is determined whether or not to perform zero point correction (see S2). When the zero point correction is performed, it is determined whether or not the base standard (see FIG. 3) is satisfied (see S3).

  In the case of the base reference, the ram 1 is lowered to the position immediately before the base B (see S4 and above). In this case, it is lowered manually. Then, it is determined whether or not this predetermined position has been reached (see S5). When it reaches the predetermined position, it is lowered to detect the contact position due to low speed and low load (see S6). Then, it is determined whether or not it is brought into contact with the base B (see S7), and when it comes in contact, pressurization is performed with a set pressure (see S8). At the time of the set pressure at that time, the position detection means 7 (as the value of the encoder 7a) detects (see S9). The value of the encoder 7a is stored as a base reference value (see S10). Each set value is corrected by the reference value (see S11). After the above correction is completed, it is determined whether or not to start machining (see S12). When starting the processing, the press machine operation means 15 is turned on to start the pressing operation and perform processing (see S13). Then, it is determined whether or not the processing is finished (see S14). When the processing is finished, a series of operations of the processing is finished, and when the processing is not finished, the processing is further continued.

  If the base standard is not used, S3 is NO and the gauge standard (see FIG. 3) is set (see S15). Then, the ram 1 is lowered to the position immediately before the gauge. In this case, it is lowered manually (see S16). It is determined whether or not this predetermined position has been reached (see S17). When it reaches the predetermined position, it is lowered to detect the contact position due to low speed and low load (see S18). Then, it is determined whether or not the gauge is brought into contact (see S19). When the gauge is brought into contact with the gauge, pressurization is performed with a set pressure (see S20). At the time of the set pressure at that time, the position detection means 7 (as the value of the encoder 7a) detects (see S21). The value of the encoder 7a is stored as a base reference value (see S22). Each set value is corrected by the reference value (see S11). After the above correction is completed, the machining operation is performed in the same manner as the base standard described above.

The block diagram which shows the structure of this invention Flowchart diagram during operation of the present invention Cross section of the present invention Perspective view of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ram 3 ... Applied pressure generation means 7 ... Position detection means 8 ... Press condition setting means 9 ... Press condition storage means 10 ... Applied pressure detection means 11 ... Zero point correction means 12 ... Reference value storage means 13 ... Correction control data storage Means A ... Conversion mechanism means

Claims (2)

A pressure generating means for generating a pressure,
Conversion mechanism means for converting into a linear motion of a press ram by the pressure generating means;
Position detecting means for detecting position data related to the linear motion of the ram;
The origin position, which is the initial set position of the upper ram, the height setting point for the position of the ram for attaching and removing the workpiece that has been lowered from the origin position, and the position just before the ram hits the workpiece. A press condition setting means for setting a press condition including a press position including a pressure position and a stop position of the ram that terminates the press operation, and a pressing force;
Press condition storage means for temporarily storing the press conditions;
A pressure detecting means for detecting the pressure,
Judgment is made on whether or not to perform zero point correction of the base standard or the gauge standard with respect to the set pressing condition, and when the gauge standard is used, the gauge corresponding to the workpiece W is used as a standard and the gauge standard Zero point correction means for commanding zero point correction at the processing origin in order to set the position to the gauge position under the press condition,
Corresponding to the command signal, the gauge position using the gauge corresponding to the workpiece W is newly set as the processing origin with respect to the origin which is the initial set position, and the position data at the time of pressing pressure under the pressing condition is used as the pressing condition. Reference value storage means for storing the reference value of
A press machine equipped with a zero point correction device, characterized by comprising correction control data storage means for storing correction control data such as a stop position in place of the press conditions according to the reference value and the press conditions. A pressure generating means for generating a pressure,
Conversion mechanism means for converting into a linear motion of a press ram by the pressure generating means;
Position detecting means for detecting position data related to the linear motion of the ram;
The origin position, which is the initial set position of the upper ram, the height setting point for the position of the ram for attaching and removing the workpiece that has been lowered from the origin position, and the position just before the ram hits the workpiece. A press condition setting means for setting a press condition including a press position including a pressure position and a stop position of the ram that terminates the press operation, and a pressing force;
Press condition storage means for temporarily storing the press conditions;
A pressure detecting means for detecting the pressure,
It is determined whether or not the gauge reference zero point correction is performed for the set pressing condition. When the gauge reference is used, the gauge corresponding to the workpiece W is used as a reference and the gauge reference position is set as the pressing condition. Zero point correction means for instructing zero point correction at the machining origin in order to obtain a gauge position at
Corresponding to the command signal, the gauge position using the gauge corresponding to the workpiece W is newly set as the processing origin relative to the origin that is the initial set position, and the position data at the time of pressing pressure under the pressing conditions is pressed. Reference value storage means for storing the reference value of the condition;
A press machine equipped with a zero point correction device, characterized by comprising correction control data storage means for storing correction control data such as a stop position in place of the press conditions according to the reference value and the press conditions.

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