CN105082611B - Method for pressing elastic deformation workpieces through press machine based on computer - Google Patents

Abstract

The invention discloses a method for pressing elastic deformation workpieces through a press machine based on a computer, and relates to the field of automation control. According to the method, collection pressure is dynamically compensated for according to collected pressure values and a pressure change tendency, so that the servo press machine accurately prejudges a pressure regulation variable to adaptively press the elastic workpieces. The pressing accuracy and pressure control stability of the elastic workpieces are improved, the situation that the elastic workpieces are pressed unqualifiedly due to the fact that pressure is too large or actual pressing pressure is slightly small in the traditional technology is avoided, and workpiece quality is guaranteed. Meanwhile, the influence of interference data is greatly eliminated, so that the adaptability of the pressure control method to different machining environments is guaranteed.

Description

Computer based forcing press elastic deformation workpiece drawing method

Technical field

The present invention relates to automation control area, particularly relate to a kind of computer based forcing press elastic deformation workpiece Drawing method.

Background technology

Servo-pressing machine is to use servomotor to be driven the forcing press controlled, and servomotor presses through journey under forcing press Can play that control is quick and feature flexibly.The parameter the most key during pressing down of forcing press be pressure and volume under pressure or Displacement of pressing head, but, existing servo-pressing machine carries out suppressing control according to the pressure data collected, and the most right The data gathered process, and height, low-response, pressure acquisition be inaccurate, adaptation ability to cause the voltage-controlled existence of workpiece to postpone The shortcoming the highest with stability, i.e. lacks the quantification monitoring pressing through journey under entirety, so cannot judge the pressure in the course of processing Strength is the most normal, and the whole course of processing is the most normal, weakens servo-pressing machine to machining accuracy and the ability of quality control.

For the flexible workpiece that can deform, the compacting difficulty that it carries out specification is very big, because workpiece band itself Flexible, the most easily occur suppressing the situations such as not in place, have influence on the machining accuracy of elastic deformation workpiece.In recent years Come, although pressure detecting in theory is the most ripe, but in actual measurement and controlling, how to ensure the most real-time pressure It is anxious to be resolved for sampling, how ensureing that elastic workpiece carries out Based Intelligent Control to obtain desirable articles according to the pressure data gathered Problem.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved is to provide one can be according to adopting Collect to pressure accurately control and there is the forcing press elastic deformation workpiece drawing method of higher stability.

For achieving the above object, the invention provides a kind of computer based forcing press elastic deformation workpiece compacting side Method, is provided with pressure transducer below the depression bar of digitally-controlled press machine, and the outfan of described pressure transducer connects processor Signal input part；Described processor is bi-directionally connected the first wireless signal transceiver module；Described first wireless signal transceiver module with Second wireless signal transceiver module is carried out data transmission by wireless signal, and described second wireless signal transceiver module is bi-directionally connected Computer；The signal output part of described processor connects the control signal input of servomotor；

Perform according to the following steps:

After step one, processor receive the signal that computer sends, controlling servomotor and drive depression bar motion, depression bar leads to Excess pressure sensor drives the pressure head of digitally-controlled press machine to move downward；

The force value collected is sent to computer by processor by pressure transducer；Set the force value that collects as Q_t, described t is positive integer；

Step 2, acquisition effective pressure ordered series of numbers；

Set effective judgment value as P_a, set judgment threshold as R；Calculate P_a=Q_a-Q_a-1Obtain P_a；Judge whether P_a>=R, Work as P_aDuring >=R, by Q_aDelete；Work as P_aDuring ＜ R, by Q_aIt is stored in effective pressure ordered series of numbers；2≤a≤t and a is integer；Described R ＞ 0； Set described effective pressure ordered series of numbers as { M_b, described b is positive integer；

Step 3, calculating pressure compensation parameter；

Set described pressure compensation parameter as N_c, calculateObtain pressure compensation parameter N_c；Described M_c∈ {M_bAnd c >=3, c be integer；

Step 4, to { M_cCompensate；

Force value after setting compensation is Z_c, calculate Obtain Z_c；

Step 5, described computer are according to force value Z after compensating_cSend a signal to described processor, so that described place Reason device controls described servomotor and drives depression bar motion.

Use above technical scheme, the force value collected is filtered, it is possible to effectively overcome accidentalia to cause Fluctuation interference, process for follow-up data and provide pressure acquisition unit value accurately.Then by calculating pressure compensation ginseng Several force value to collecting compensate, and the pressure divergence collected due to traditional servo-pressing machine is big and dynamic response Difference, lacks consideration to the trend of pressure change, it is therefore necessary to compensate pressure, and the pressure using the technical program to obtain is mended Repay parameter and compensation way, it is possible to force value and pressure trend that dynamic basis collects are mended gathering pressure Repay so that servo-pressing machine can accurate anticipation pressure regulated quantity, so that elastic workpiece is carried out adaptive compacting, improve pin Compacting accuracy and pressure controlled stability to elastic workpiece, does not haves the excessive or actual pressure of the pressure in traditional handicraft Pressing pressure is slightly smaller causes elastic workpiece compacting defective, it is ensured that the quality of workpiece, simultaneously because largely eliminate interference number According to impact, it is ensured that this compress control method is at the adaptability of different processing environments.Meanwhile, the technical program allows servo pressure Machine is interacted with host computer by wireless signal, to realize data acquisition and Stress control, is more suitable for the remote of integrated mill Distance controlling and data collection and analysis, improve the compacting efficiency of elastic workpiece, reduce human cost.

It is also preferred that the left described step 5 performs according to the following steps:

Force value Z after compensating_cContrast with setup pressure value；Force value Z after compensating_cMore than or equal to setting During force value, described computer sends a signal to described processor, and described processor sends control signal to described servomotor, Described Serve Motor Control depression bar is pressed under stopping；

Force value Z after compensating_cDuring less than setup pressure value, described computer sends a signal to described processor, institute State processor send control signal to described servomotor, press under described Serve Motor Control depression bar.

The invention has the beneficial effects as follows: the present invention can become according to the force value collected and die pressure change dynamically Gesture compensates gathering pressure so that servo-pressing machine can accurate anticipation pressure regulated quantity, so that elastic workpiece is fitted The compacting of answering property, improves the compacting accuracy for elastic workpiece and pressure controlled stability, does not haves traditional handicraft In the excessive or actual pressing pressure of pressure slightly smaller cause elastic workpiece compacting defective, it is ensured that the quality of workpiece, simultaneously by In the impact largely eliminating interference data, it is ensured that this compress control method is at the adaptability of different processing environments.

Accompanying drawing explanation

Fig. 1 is that the circuit theory of the forcing press elastic deformation workpiece compacting control system of the embodiment of the invention is shown It is intended to.

Fig. 2 is the schematic flow sheet of the embodiment of the invention.

Detailed description of the invention

The invention will be further described with embodiment below in conjunction with the accompanying drawings:

As it is shown in figure 1, a kind of computer based forcing press elastic deformation workpiece compact system, including being arranged on numerical control pressure Pressure transducer 1 below power machine depression bar, the outfan of described pressure transducer 1 connects the signal input part of processor 2；It is special Levy and be: described processor 2 is bi-directionally connected the first wireless signal transceiver module 3；Described first wireless signal transceiver module 3 and Two wireless signal transceiver modules 6 are carried out data transmission by wireless signal, and described second wireless signal transceiver module 6 is bi-directionally connected Computer 5；The signal output part of described processor 2 connects the control signal input of servomotor 4.

As in figure 2 it is shown, a kind of computer based forcing press elastic deformation workpiece drawing method, perform according to the following steps:

After step one, processor 2 receive the signal that computer 5 sends, control servomotor 4 and drive depression bar to move, pressure Bar drives the pressure head of digitally-controlled press machine to move downward by pressure transducer 1；The force value collected is passed through by pressure transducer 1 Processor 2 is sent to computer 5；Set the force value that collects as Q_t, described t is positive integer.

Step 2, acquisition effective pressure ordered series of numbers.

Set effective judgment value as P_a, set judgment threshold as R；Calculate P_a=Q_a-Q_a-1Obtain P_a；Judge whether P_a>=R, Work as P_aDuring >=R, by Q_aDelete；Work as P_aDuring ＜ R, by Q_aIt is stored in effective pressure ordered series of numbers；2≤a≤t and a is integer；Described R ＞ 0； Set described effective pressure ordered series of numbers as { M_b, described b is positive integer.Described effective pressure ordered series of numbers at least gathers and has 4 effectively Force value；Force value in described effective pressure ordered series of numbers is arranged by acquisition order, and first the effective pressure value collected is M₁, Second virtual value collected is M₂... b the effective pressure value collected is M_b.This programme gathers pressure from second Q₂The mutation pressure data that starting i.e. excludes the interference signal causes, have filtered the impact of environment, it is ensured that the data precision of collection And effectiveness.

Step 3, calculating pressure compensation parameter.

Set described pressure compensation parameter as N_c, calculateObtain pressure compensation parameter N_c；Described M_c∈ {M_bAnd c >=3, c be integer.

Step 4, to { M_cCompensate.

Force value after setting compensation is Z_c, calculate Obtain Z_c。

In above scheme, work as M_C-1-M_c-2＞ 0 and M_C-M_c-1＞ 0, then workpiece pressing pressure is for continuing the rising stage, works as M_C-₁- M_c-2＞ 0 and M_C-M_c-1＜ 0, then the impacted decline of workpiece pressing pressure, works as M_C-1-M_c-2＜ 0 and M_C-M_c-1＜ 0, then workpiece compacting Pressure is the continuous decrease phase, works as M_C-1-M_c-2＜ 0 and M_c-M_c-1＞ 0, then the impacted rising of workpiece pressing pressure, works as M_C-1-M_c-2= 0 or M_C-M_c-1When=0, workpiece pressing pressure is in stable phase.Above scheme is in different trend according to workpiece pressing pressure, Take corresponding compensation way, it is to avoid mistake carry out pressure compensation, improve workpiece compacting precision, it is possible to adding dynamically The work cycle is carried out voltage-controlled, it is ensured that the quality of foundry goods.

The pressure compensation parameter of this programme and compensation way can reflect the variation tendency of die pressure, owing to compensating Before effectively filtered out the mutation pressure of servo-pressing machine, effectively avoid the trend anticipation mistake that mutation pressure value causes, energy Enough in the delicate workpieces processing technique that pressure changes greatly or pressure change is little, it is respectively provided with higher pressure control accuracy so that this programme Compensation way become a reality.

Step 5, described computer 5 are according to force value Z after compensating_cSend a signal to described processor 2, so that described Processor 2 controls described servomotor 4 and drives depression bar to move.Due to servo-pressing machine can accurate anticipation pressure regulated quantity, and According to die pressure variation tendency to gather pressure compensate, then computer send control signal make processor control watch Take forcing press and elastic workpiece is carried out adaptability compacting, improve compacting accuracy and pressure controlled stability, it is ensured that bullet Property workpiece compacting quality, simultaneously because largely eliminate interference data impact, it is ensured that this compress control method is not Adaptability with processing environment.

In the present embodiment, described step 5 performs according to the following steps:

Force value Z after compensating_cContrast with setup pressure value；Force value Z after compensating_cMore than or equal to setting During force value, described computer 5 sends a signal to described processor 2, and described processor 2 sends control signal to described servo electricity Machine 4, described servomotor 4 controls to press under depression bar stops；

Force value Z after compensating_cDuring less than setup pressure value, described computer 5 sends a signal to described processor 2, Described processor 2 sends control signal to described servomotor 4, and described servomotor 4 controls to press under depression bar.

The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art without Need creative work just can make many modifications and variations according to the design of the present invention.Therefore, all technology in the art Personnel are available by logical analysis, reasoning, or a limited experiment the most on the basis of existing technology Technical scheme, all should be in the protection domain being defined in the patent claims.

Claims (2)

1. a computer based forcing press elastic deformation workpiece drawing method, is provided with below the depression bar of digitally-controlled press machine Pressure transducer (1), the outfan of described pressure transducer (1) connects the signal input part of processor (2)；It is characterized in that: Described processor (2) is bi-directionally connected the first wireless signal transceiver module (3)；Described first wireless signal transceiver module (3) and the Two wireless signal transceiver modules (6) are carried out data transmission by wireless signal, and described second wireless signal transceiver module (6) is two-way Connect computer (5)；The signal output part of described processor (2) connects the control signal input of servomotor (4)；

Perform according to the following steps:

After step one, processor (2) receive the signal that computer (5) sends, control servomotor (4) and drive depression bar motion, Depression bar drives the pressure head of digitally-controlled press machine to move downward by pressure transducer (1)；

The force value collected is sent to computer (5) by processor (2) by pressure transducer (1)；Set the pressure collected Force value is Q_t, described t is positive integer；

Step 2, acquisition effective pressure ordered series of numbers；

Set effective judgment value as P_a, set judgment threshold as R；Calculate P_a=Q_a-Q_a-1Obtain P_a；Judge whether P_a>=R, works as P_a During >=R, by Q_aDelete；Work as P_aDuring ＜ R, by Q_aIt is stored in effective pressure ordered series of numbers；2≤a≤t and a is integer；Described R ＞ 0；Set Described effective pressure ordered series of numbers is { M_b, described b is positive integer；

Step 3, calculating pressure compensation parameter；

Set described pressure compensation parameter as N_c, calculateObtain pressure compensation parameter N_c；Described M_c∈{M_b} And c >=3, c are integer；

Step 4, to { M_cCompensate；

Force value after setting compensation is Z_c, calculate $Z_c=\left\{\begin{array}{ccccc}{M}_c-\left|N_c\right|& if& M_{C-1}-M_{c-2}>0& and& M_C-M_{c-1}>0\\ M_c+\left|N_c\right|& if& M_{C-1}-M_{c-2}>0& and& M_C-M_{c-1}<0\\ M_c+\left|N_c\right|& if& M_{C-1}-M_{c-2}<0& and& M_C-M_{c-1}<0\\ M_c-\left|N_c\right|& if& M_{C-1}-M_{c-2}<0& and& M_C-M_{c-1}>0\\ M_c& if& M_{C-1}-M_{c-2}=0& & \\ M_c& if& M_C-M_{c-1}=0& & \end{array}\right.$ Obtain Z_c；

Step 5, described computer (5) are according to force value Z after compensating_cSend a signal to described processor (2), so that described place Reason device (2) controls described servomotor (4) and drives depression bar motion.

2. computer based forcing press elastic deformation workpiece drawing method as claimed in claim 1, is characterized in that: described step Rapid five perform according to the following steps:

Force value Z after compensating_cContrast with setup pressure value；Force value Z after compensating_cMore than or equal to setting pressure During value, described computer (5) sends a signal to described processor (2), and described processor (2) sends control signal to described servo Motor (4), described servomotor (4) controls to press under depression bar stops；

Force value Z after compensating_cDuring less than setup pressure value, described computer (5) sends a signal to described processor (2), institute Stating processor (2) and send control signal to described servomotor (4), described servomotor (4) controls to press under depression bar.