Waste liquid treatment system of precision machine tool

Abstract

The invention relates to the technical field of machine tool waste liquid treatment, and particularly discloses a precision machine tool waste liquid treatment system which comprises a data analysis module, the data analysis module gives out a series added value and a cycle series according to detection data, and the cycle series is the sum of the series added value and an initial series. The multiple liquid storage bins are arranged, new cutting fluid or cutting fluid with few circulating stages can be independently stored, the part of cutting fluid is used when parts which do not react with the cutting fluid are machined, and therefore the cutting fluid can be used for machining parts which do not react with the cutting fluid. Therefore, all new cutting fluid or cutting fluid with few circulation stages can reach the expected service life, the management and use process of the cutting waste liquid is optimized, and the use benefits of the cutting fluid are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tool waste liquid treatment, and in particular to a waste liquid treatment system for precision machine tools. Background Art

[0002] Machine tools, as equipment for processing parts, perform various operations, including drilling and milling. Cutting fluids must be continuously applied during the process to ensure optimal results. Machine tool waste fluid refers to the waste fluid mixed with metal debris and other debris after use. Cutting fluids come in two types: water-based and oil-based. Water-based cutting fluids are relatively inexpensive and widely used. Oil-based cutting fluids generally offer superior performance but are more expensive than water-based fluids. They are typically used in precision component manufacturing processes or on precision machine tools where water is strictly prohibited.

[0003] During the machining process of precision machine tools using oil-based materials, due to the high cost of cutting fluid, some processing manufacturers will use circulation equipment to recycle the used cutting fluid, including adjusting the pH value, adding additives, and other operations to regenerate the usable cutting fluid. Obviously, this cycle is not infinite. Generally speaking, if there are problems such as chemical changes in the cutting fluid, large amounts of machine tool lubricant leakage, and excessive water mixing, the oil-based cutting fluid will need to be replaced. There is no fixed standard for the specific number of cycles and replacement time, and it is generally set by the factory at a fixed number of months.

[0004] The problem is that some parts processed by machine tools are not fixed. Some parts contain metals that can react with cutting fluid while some parts do not. At present, there is rarely a process to deal with this problem in the use of cutting fluid. If too many parts with metals that can react with cutting fluid are processed, the cutting fluid that could have been used for several months will not reach the expected service life. In view of this, the present invention proposes a waste liquid treatment system for precision machine tools to classify and manage waste liquid and optimize the use process of new cutting fluid. Summary of the Invention

[0005] The purpose of the present invention is to provide a waste liquid treatment system for precision machine tools to solve the following technical problems: How to classify and manage waste fluids and optimize the use of new cutting fluids.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A waste liquid treatment system for a precision machine tool, comprising: A liquid storage module, wherein the liquid storage module includes at least two liquid storage tanks, and different liquid storage tanks are used to store cutting fluids of different circulation levels; A primary filter module is provided below the machining table of the machine tool and is not in contact with the cutting fluid. The primary filter module is used to perform a preliminary filtration on the cutting fluid after use, separating large metal chips from the cutting fluid; A detection module, which is used to obtain detection data during a use process, the detection data including usage time, temperature data of the tool during processing, and quality data of the filtered product of the primary filtration module; A data analysis module, wherein the data analysis module provides a series increase value and a cycle series according to the detection data, wherein the cycle series is the sum of the series increase value and the initial series, and the initial series is the cycle series of the cutting fluid before completing the use process; The circulation module is used to circulate the cutting fluid after completing a use process.

[0007] Through the above technical solution: a process of managing the use of cutting fluid according to the classification of circulation levels is provided. The present invention sets up multiple liquid storage tanks, which can store new cutting fluid or cutting fluid with a small number of circulation levels separately. This part of cutting fluid is used when processing parts that do not react with the cutting fluid, so that all new cutting fluid or cutting fluid with a small number of circulation levels can reach the expected service life, optimize the management and use process of cutting waste fluid, and improve the use efficiency of cutting fluid.

[0008] As a further technical solution of the present invention: the process of obtaining the series added value includes: By formula Get the increase coefficient ; in, ; ; ; in, is the time index, and are the preset fitting parameters, is the temperature index, is the quality index, is the temperature action function, max is used to take the maximum value, is the total time of a usage process, The default base time is This is a curve showing the change of tool temperature over time during use. is the preset temperature state reference value, N is the total number of parts processed in a process, i represents the i-th processed part, represents the starting processing time of the i-th part, represents the end processing time of the i-th part, is the curve of the filtration product quality of the primary filtration module changing with time during the processing of the i-th part, is the preset cutting fluid impact mass variation curve over time, is the quality status reference value corresponding to the i-th part; Then, the level increase value is selected based on the preset comparison table and the increase coefficient.

[0009] As a further technical solution of the present invention: the temperature action function includes:

[0010] in is the temperature index, is the quality index, The category mean is the average of the metal category scores of all parts in a processing process. The metal category score is a score for the reaction ability of standard-sized chips of processed metal with the current cutting fluid at a standard temperature. Preferably, the metal with the lowest reaction ability (excluding metals that will not react) is selected and its metal category score is set to 1. Obviously, for metals that will not react, the metal category score is 0.

[0011] Through the above technical solution: a process for obtaining the series increase value is provided. The series increase value of the present invention is obtained by comprehensively considering factors such as temperature, quality and processing time during a processing process. The temperature action function of the present invention is used as part of the calculation factor of the increase coefficient. It can comprehensively distinguish and process the situations where there is a metal that reacts with the current cutting fluid, there is no metal that reacts with the current cutting fluid, and the two metals are mixed, and it is reflected by the change in the final value of the increase coefficient. The more metals that react with the current cutting fluid, the greater the numerical change of the temperature action function, and the corresponding greater the numerical change of the increase coefficient.

[0012] As a further technical solution of the present invention: it also includes: A preprocessing module obtains all part processing plans in the next use process, obtains a processing coefficient based on the part processing accuracy value, cutting quality and metal type in the processing plan, and selects a liquid storage tank to provide cutting fluid for part processing in the next use process based on the processing coefficient.

[0013] As a further technical solution of the present invention: the process of obtaining the processing coefficient includes: By formula Get the processing coefficient H; in, is the category mean of all parts in the next use process, M is the total number of parts planned to be processed in the next use process, j represents the jth processed part in the next use process, is the machining accuracy of the jth part processed in the next use process, is the preset accuracy standard value, is the expected cutting amount of the jth processed part in the next use process, It is the preset standard value of cutting amount. and They are weight coefficients preset based on machining accuracy and expected cutting amount respectively.

[0014] As a further technical solution of the present invention: there are three liquid storage tanks, one of which is used for cutting fluid whose circulation number is within the critical interval after completing a processing process, and the other two are used to store cutting fluid whose circulation number is less than the right end point of the critical interval after completing a processing process and cutting fluid whose circulation number is greater than the left end point of the critical interval after completing a processing process.

[0015] As a further technical solution of the present invention, the process of selecting a liquid storage tank to provide cutting fluid for part processing in the next use process according to the processing coefficient includes: Obtain historical data and construct a mapping relationship between the processing coefficient H and the series increase value L, where the input value of the mapping relationship is the processing coefficient and the output value is the series increase value; Input the processing coefficient H of the next process into the established mapping relationship to obtain the output value ; Will output value With threshold Compare, if the output value After completing one machining process, the liquid storage tank with a cycle number less than the right end point of the critical interval is selected to provide cutting fluid for the next use process; Otherwise, another two storage bins are selected to provide cutting fluid for the next use process.

[0016] Through the above technical solution: a process for managing cutting fluid by combining the cycle number acquisition process and three liquid storage tanks is provided. The present invention sets a liquid storage tank as a transition to store the cutting fluid whose cycle number is within the critical range after completing a processing process. The cutting fluid whose cycle number reaches near the preset number of cycles can be stored separately. When the processing coefficient and the corresponding output value are large, this part of the cutting fluid can be used, and it can be ensured that the cycle number of this part of the cutting fluid is greater than the cycle number, thereby improving the use efficiency of the cutting fluid.

[0017] As a further technical solution of the present invention: the process of setting the critical interval includes: Get the expected service life of the current cutting fluid and set the number of cycles X based on the expected service life. ,in is the daily production index of the corresponding machine tool in the current factory. is the expected useful life in days, is the preset correction number; The critical interval is [Xa,X].

[0018] Beneficial effects of the present invention: (1) The present invention is provided with multiple liquid storage tanks, which can store new cutting fluid or cutting fluid with a small number of circulation stages separately, and use this part of cutting fluid when processing parts that do not react with the cutting fluid, so that all new cutting fluid or cutting fluid with a small number of circulation stages can reach the expected service life, optimize the management and use process of cutting waste fluid, and improve the use efficiency of cutting fluid.

[0019] (2) The temperature action function of the present invention, as a part of the calculation factor of the increase coefficient, can comprehensively distinguish and process the situations where there is a metal that reacts with the current cutting fluid, there is no metal that reacts with the current cutting fluid, and the two metals are mixed, and is reflected by the change in the final value of the increase coefficient. The more metals that react with the current cutting fluid, the greater the numerical change of the temperature action function, and the corresponding greater the numerical change of the increase coefficient.

[0020] (3) The present invention provides a storage tank for cutting fluid whose circulation level is within a critical range after completing a machining process as a transition, so that the cutting fluid whose circulation level reaches near the preset number of cycles can be stored separately. When the machining coefficient and the corresponding output value are large, this part of the cutting fluid can be used, and the circulation level of this part of the cutting fluid can be ensured to be greater than the number of cycles, thereby improving the use efficiency of the cutting fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the modular composition of the processing system of the present invention. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1 As shown, in one embodiment, a waste liquid treatment system for a precision machine tool is provided, comprising: The liquid storage module includes at least two liquid storage tanks, and different liquid storage tanks are used to store cutting fluids of different circulation levels. The liquid storage tanks are connected to the machine tool and provide cutting fluid to the machine tool. Multiple liquid storage tanks can be provided or installed before use in a movable connection manner. After obtaining the circulation level, the cutting fluid is stored in the corresponding liquid storage tank according to the circulation level. The primary filter module is located under the machine tool processing table and does not come into contact with the cutting fluid. The primary filter module can perform preliminary filtration on the used cutting fluid. The filter mesh size is between 0.1-0.2 mm and is used to separate large metal debris from the cutting fluid. The detection module is used to obtain detection data during a use process, including the use time, the temperature data of the tool during the processing, and the quality data of the filtered product of the primary filter module; A data analysis module provides a series increase value and a cycle series according to the detection data. The cycle series is the sum of the series increase value and the initial series. The initial series is the cycle series of the cutting fluid before the use process is completed. The circulation module is used to circulate the cutting fluid after completing a use process. The circulation treatment includes adjusting the pH value, supplementing additives, etc.

[0025] In this embodiment, a process for managing the use of cutting fluid according to the classification of the circulation levels is provided. The present invention sets up multiple liquid storage tanks, which can store new cutting fluid or cutting fluid with a small circulation level separately, and use this part of cutting fluid when processing parts that do not react with the cutting fluid. In this way, all new cutting fluid or cutting fluid with a small circulation level can reach the expected service life, optimize the management and use process of cutting waste fluid, and improve the use efficiency of cutting fluid.

[0026] In one embodiment, the process of obtaining the level increase value includes: By formula Get the increase coefficient ; in, ; ; ; in, is the time index, and are the preset fitting parameters, is the temperature index, is the quality index, is the temperature action function, max is used to take the maximum value, is the total time of a usage process, The default base time is is a curve of tool temperature changing with time during a use process, is a preset temperature state reference value, N is a total number of machined parts during a use process, and i represents the i th machined part, represents a starting machining time of the i th part, represents an ending machining time of the i th part, is a curve of a filtering product mass of the initial filtering module changing with time during machining of the i th part, is a preset cutting fluid impact mass changing curve with time, is a corresponding mass state reference value of the i th part; Then, a series increase value is selected based on the preset comparison table and the increase coefficient.

[0027] In an embodiment, a part of the preset comparison table can be represented as follows:

[0028] It should be noted that a specific value of the increase coefficient is set according to an actual machining process, and the preset temperature state reference value is a preset standard value, and the mass state reference value needs to be set according to a machining scheme of a current part, is set according to a flow of a cutting fluid spray head, which is not described here.

[0029] The temperature action function includes:

[0030] wherein is a temperature index, is a mass index, is a category average, the category average is an average of sum of metal category evaluation values of all parts during a machining process, and the metal category evaluation value is an evaluation of a reaction capability of a standard size of a machining metal fragment and a current cutting fluid at a standard temperature, preferably, a metal with the lowest reaction capability (excluding a metal that does not react) is selected and the metal category evaluation value of the metal is set to 1, and obviously, the metal category evaluation value of the metal that does not react is 0.

[0031] In the embodiment, a process of obtaining the series increase value is provided, the series increase value of the present application is obtained by comprehensively considering factors such as temperature, mass and machining time during a machining process, and the temperature action function of the present application is obtained by a formula The temperature action function is obtained as a part of the calculation factor of the increase coefficient. It can comprehensively distinguish the situations where there is a metal that reacts with the current cutting fluid, the metal that does not react with the current cutting fluid, and the mixture of two metals, and it is reflected by the change of the final value of the increase coefficient. The more metals that react with the current cutting fluid, the greater the value change of the temperature action function, and the corresponding greater the value change of the increase coefficient.

[0032] In one embodiment, the waste liquid treatment system for a precision machine tool further comprises: The preprocessing module obtains all parts processing plans in the next use process, and obtains the processing coefficient based on the part processing accuracy value, cutting quality and metal type in the processing plan, and selects a liquid storage tank based on the processing coefficient to provide cutting fluid for part processing in the next use process.

[0033] The process of obtaining the processing coefficient includes: By formula Get the processing coefficient H; in, is the category mean of all parts in the next use process, M is the total number of parts planned to be processed in the next use process, j represents the jth processed part in the next use process, is the machining accuracy of the jth part processed in the next use process, is the preset accuracy standard value, is the expected cutting amount of the jth processed part in the next use process, It is the preset standard value of cutting amount. and They are weight coefficients preset based on machining accuracy and expected cutting amount respectively.

[0034] Obviously, the present invention is applicable to both single-type parts and mixed processing of multiple different types of parts.

[0035] It should be noted that the standard values ​​of cutting amount and accuracy are set based on empirical data. They can be constructed using data generated by a representative part processing process, which will not be described in detail here.

[0036] In one embodiment, three liquid storage tanks are provided, one of which is used for cutting fluid whose circulation number is within the critical interval after completing a machining process, and the other two are used to store cutting fluid whose circulation number is less than the right end point of the critical interval after completing a machining process and cutting fluid whose circulation number is greater than the left end point of the critical interval after completing a machining process.

[0037] It should be noted that the number of liquid storage tanks is not limited to 3. More liquid storage tanks can be set up to store cutting fluid whose circulation level is within the critical interval after completing a processing process or whose circulation level is less than the right end point of the critical interval after completing a processing process, so that it can be used in time when needed. In addition, cutting fluid with a circulation level greater than the left end point of the critical interval needs to be regularly inspected and tested, and unqualified cutting fluid should be sent to a professional processing unit for treatment in a timely manner.

[0038] The process of selecting a fluid reservoir based on the machining coefficient to provide cutting fluid for the next part machining process includes: Obtain historical data and construct a mapping relationship between the processing coefficient H and the series increase value L. The input value of the mapping relationship is the processing coefficient, and the output value is the series increase value. The mapping relationship can be constructed through a neural network model, which will not be described in detail. Input the processing coefficient H of the next process into the established mapping relationship to obtain the output value ; Will output value With threshold Compare, if the output value Then, after completing one machining process, the liquid storage tank with a cycle number less than the right end point of the critical interval is selected to provide cutting fluid for the parts machining in the next use process; Otherwise, the other two storage bins are selected to provide cutting fluid for part processing in the next use process.

[0039] In this embodiment, a process for managing cutting fluid by combining a cycle number acquisition process and three fluid storage tanks is provided. The present invention sets up a fluid storage tank as a transition to store cutting fluid whose cycle number is within a critical range after completing a processing process. Cutting fluid whose cycle number reaches near a preset number of cycles can be stored separately. When the processing coefficient and the corresponding output value are large, this part of the cutting fluid can be used, and it can be ensured that the cycle number of this part of the cutting fluid is greater than the number of cycles, thereby improving the use efficiency of the cutting fluid.

[0040] The process of setting the critical interval includes: Get the expected service life of the current cutting fluid and set the number of cycles X based on the expected service life. ,in is the daily production index of the corresponding machine tool in the current factory. is the expected useful life in days, It is a preset correction number. The correction number is selected according to the quality of the cutting fluid and is selected in the interval [1,2]. The daily production index is set according to the operating time of the machine tool, usually the ratio of the actual daily usage time to the standard time (8 hours) within a month; The critical interval is [Xa,X], where a is a constant ranging from 8 to 12.

[0041] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A waste liquid treatment system for precision machine tools, characterized in that: include: A liquid storage module, wherein the liquid storage module includes at least two liquid storage tanks, and different liquid storage tanks are used to store cutting fluids of different circulation levels; A primary filter module is provided below the machine tool processing table and is used to perform preliminary filtration on the cutting fluid after use; A detection module, which is used to obtain detection data during a use process, the detection data including usage time, temperature data of the tool during processing, and quality data of the filtered product of the primary filtration module; A data analysis module, wherein the data analysis module provides a series increase value and a cycle series according to the detection data, wherein the cycle series is the sum of the series increase value and the initial series, and the initial series is the cycle series of the cutting fluid before completing the use process; The circulation module is used to circulate the cutting fluid after completing a use process.

2. A waste liquid treatment system for precision machine tools according to claim 1, characterized in that: The process of obtaining the series value-added includes: By formula Get the increase coefficient ; in, ; ； ； in, is the time index, and are the preset fitting parameters, is the temperature index, is the quality index, is the temperature action function, max is used to take the maximum value, is the total time of a usage process, The default base time is This is a curve showing the change of tool temperature over time during use. is the preset temperature state reference value, N is the total number of parts processed in a process, i represents the i-th processed part, represents the starting processing time of the i-th part, represents the end processing time of the i-th part, is the curve of the filtration product quality of the primary filtration module changing with time during the processing of the i-th part, is the preset cutting fluid impact mass variation curve over time, is the quality status reference value corresponding to the i-th part; Then, the level increase value is selected based on the preset comparison table and the increase coefficient.

3. The waste liquid treatment system for a precision machine tool according to claim 2, characterized in that: Temperature action functions include: in is the temperature index, is the quality index, The category mean is the average of the metal category score values ​​of all parts in a processing process.

4. The waste liquid treatment system for precision machine tools according to claim 1, characterized in that: Also includes: A pre-processing module obtains all part processing plans in the next use process, obtains a processing coefficient based on the part processing accuracy value, cutting quality and metal type in the processing plan, and selects a liquid storage tank to provide cutting fluid for part processing in the next use process based on the processing coefficient.

5. A waste liquid treatment system for precision machine tools according to claim 4, characterized in that: The process of obtaining the processing coefficient includes: By formula Get the processing coefficient H; in, is the category mean of all parts in the next use process, M is the total number of parts planned to be processed in the next use process, j represents the jth processed part in the next use process, is the machining accuracy of the jth part processed in the next use process, is the preset accuracy standard value, is the expected cutting amount of the jth processed part in the next use process, It is the preset standard value of cutting amount. and They are weight coefficients preset based on machining accuracy and expected cutting amount respectively.

6. A waste liquid treatment system for precision machine tools according to claim 5, characterized in that: There are three liquid storage tanks, one of which is used for cutting fluid whose circulation number is within the critical interval after completing a processing process, and the other two are used to store cutting fluid whose circulation number is less than the right end point of the critical interval after completing a processing process and cutting fluid whose circulation number is greater than the left end point of the critical interval after completing a processing process.

7. A waste liquid treatment system for precision machine tools according to claim 6, characterized in that: The process of selecting a fluid reservoir based on the machining coefficient to provide cutting fluid for the next part machining process includes: Obtain historical data and construct a mapping relationship between the processing coefficient H and the series increase value L, where the input value of the mapping relationship is the processing coefficient and the output value is the series increase value; Input the processing coefficient H of the next process into the established mapping relationship to obtain the output value ; Will output value With threshold Compare, if the output value After completing one machining process, the storage tank with a cycle number less than the right end point of the critical interval is selected to provide cutting fluid for the next use process; Otherwise, another two storage bins are selected to provide cutting fluid for the next use process.

8. The waste liquid treatment system for precision machine tools according to claim 1, characterized in that: The process of setting the critical interval includes: Get the expected service life of the current cutting fluid and set the number of cycles X based on the expected service life. ,in is the daily production index of the corresponding machine tool in the current factory. is the expected useful life in days, is the preset correction number; The critical interval is [Xa,X].

Images