WO2016101624A1 - Machining workshop workpiece energy consumption quota formulation method - Google Patents

Abstract

A machining workshop workpiece energy consumption quota formulation method based on a workshop equipment, a basic database and a process plan. The method needs to pre-establish an energy consumption basic database according to a workshop equipment; on this basis, classify energy consumption process steps required for machining a workpiece and determine the quantity of same according to the process plan of the workpiece, acquire calculation data of each type of process step related to the energy consumption, and calculate and acquire the energy consumption of various energy consumption process steps such as standby, starting, no-load, cutting, intermittent stopping and transfer and the apportioned energy consumption of a workshop auxiliary equipment; and finally sum the energy consumption of all process steps and the apportioned energy consumption, thereby being able to determine the total energy required in the whole machining process of the workpiece, namely the energy consumption quota of the workpiece.

Description

Method for formulating workpiece energy consumption quota in mechanical processing workshop Technical field

The invention relates to a method for formulating energy consumption quota, in particular to a method for formulating a workpiece energy consumption quota in a mechanical processing workshop.

Background technique

The machine shop is mainly based on machine tools. Machine tools and their machining systems are large in scale, with great potential for energy saving and environmental reduction. Workpiece energy quota is important to enhance the energy consumption process management, monitoring and energy efficiency of the workpiece processing process. There have been some studies on the energy consumption of mechanically processed workpieces and their energy consumption predictions. Liu Fei et al. proposed a method for predicting energy consumption in the service process of CNC machine tools. This method can be used for energy prediction of CNC machine tools in actual production. Dietmair A et al. proposed a machine based on statistical discrete time. And the general energy consumption modeling method of the factory, which can be directly used in the planning process to predict the energy consumption of different configurations in different scenarios; Gutowski et al. also carried out a series of analysis on the processing environment factors and introduced the processing process. Theoretical energy consumption model. However, none of the above methods fully consider the energy consumption of the whole process of workpiece machining or the definition of related parameters is not clear, and the relevant parameter values in the model are not known. Therefore, the above methods cannot be used to formulate the energy consumption quota of the workpiece in the machine shop.

At present, there are many mature methods in the formulation of energy consumption quotas for process manufacturing industries such as steel and chemical industry. However, in the large-scale machining manufacturing industry, due to the complexity and dynamic variability of energy consumption laws, It is very difficult to formulate the energy consumption quota. The method for determining the energy consumption quota of the workpiece has not been found, and it is very difficult to formulate the energy consumption quota. Therefore, it is difficult to find a practical method for formulating the energy consumption of the workpiece.

Summary of the invention

In view of the shortcomings of the current machining manufacturing industry lacking the method for formulating the energy consumption quota of the workpiece, the object of the present invention is to propose a method for formulating the energy consumption quota of the machining shop based on the workshop equipment, the basic database and the process plan, and realize the mechanical processing manufacturing industry. The formulation of the energy consumption quota for the whole process of workpiece processing.

In order to achieve the above object, the present invention adopts the following technical means:

A method for formulating a workpiece energy consumption quota in a machine shop, characterized in that the method comprises the following steps:

(1) Pre-establishing the energy consumption basic database according to the workshop equipment, including: standby power database, startup energy consumption database, no-load power database, load loss coefficient database, transfer power database and workshop auxiliary equipment power Database

(2) According to the workpiece process plan, the energy consumption steps required for machining the workpiece are classified and the quantity is determined, and the calculation data related to the energy consumption of various work steps are obtained, including: the standby time of the machine tool of the standby energy consumption step, The spindle speed of the machine tool that starts the energy consumption step, the spindle speed of the machine tool with no-load energy consumption step and the running time of the no-load, the spindle speed of the machine tool for cutting the energy consumption step, the feed amount, the amount of the back-feeding knife and the cutting time and the workpiece material Etc., stop time between machine tools for stopping energy consumption steps, transfer equipment and transit time for transferring energy consumption steps, and data such as rated power and working time of workshop auxiliary equipment;

Then calculate and obtain the energy consumption of various energy-consuming steps such as standby, start-up, no-load, cutting, stop, transfer, and the auxiliary energy consumption of the workshop auxiliary equipment;

(3) Calculate the total energy required for the whole process of the workpiece by summing up the energy consumption of all the steps and the energy consumption. The energy consumption quota of the workpiece is calculated. The calculation method of the energy consumption quota of the workpiece is as follows:

Among them: E _Quota represents the workpiece energy consumption quota, E _sbi , E _sui , E _uni , E _mai , E _pai , E _tri and E _ap respectively represent the ith standby , start , no load , cutting , stop , transfer energy consumption The energy consumption of the step and the workshop auxiliary equipment of the unit workpiece share the energy consumption, N _SB , N _SU , N _UN , N _MA , N _PA , and N _TR respectively indicate standby, start, no load, cutting, stop, transfer energy The number of steps consumed, i represents the serial number of the energy step.

Further, the total energy consumption E _{MA of} the cutting energy consumption step is composed of a plurality of machine tools involved in the whole process of the workpiece processing, and energy consumption of a plurality of cutting energy consumption steps; wherein, the energy consumption of the single cutting energy consumption step E _Mai is composed of three parts: the no-load energy consumption E _uni , the cutting energy consumption E _ci and the additional load energy consumption E _ai in the cutting energy consumption step. The total energy consumption of the cutting energy consumption step in the whole process of workpiece machining is determined by the formula. :

Calculated acquisition, wherein the additional load power P _ai and the cutting power P _ci adopt a linear function relationship P _ai =α _i P _ci , P _ci =F _ci ×v _ci , the load loss coefficient α _i and the no-load power P _uni database lookup to obtain the corresponding cutting time t _mai process scheme can be obtained from, and may be calculated to obtain the cutting force P _ci F _ci, cutting speed v _ci process scheme according to the data.

Further, after determining the processing workshop, searching for the rated power P _api of the corresponding workshop auxiliary equipment from the workshop auxiliary equipment power database, and obtaining the processing time of the batch of workpieces in the workshop through the process plan, that is, assisting in the workshop The working time of the equipment t _ap , the rated total power of the auxiliary energy-consuming equipment for all work in the workshop

The total energy consumption of the workshop auxiliary equipment can be calculated by the formula E _{ap_n} =P _{ap_n} ×t _ap ; the workshop has a variety of workpieces processed in the workshop at the same time, and the total energy consumption of the workshop auxiliary equipment is shared by various workpieces. The consumption and distribution is divided according to the ratio of one of the workpiece processing time to the total processing time of all the workpieces. According to the production plan of the workpiece, the total processing time of the workpiece in the workshop is t _ap and the number of workpieces processed is n _ap , and Obtaining the total processing time t' _{i of} each other type of workpiece in the total machining time t _ap and the number of workpieces N′ _i , the energy consumption of the auxiliary energy-consuming equipment in the workshop is allocated to the allocated energy consumption of the batch of workpieces ( Said workshop auxiliary equipment to share energy consumption)

Compared with the prior art, the present invention has the following beneficial effects:

1. The invention only needs to establish the basic database of energy consumption in advance, and know the cutting amount in the processing of the workpiece and the running time of each step or the working time of the workshop equipment, so that the energy consumption quota of the whole process of machining processing in the machining manufacturing industry can be realized. Formulated, the method is simple and easy to apply, and is generally applicable to existing machining shops.

2. The present invention provides a solution to the problem of formulating the energy consumption quota of workpiece processing in the machining manufacturing industry. It plays an important role in strengthening the energy consumption process management, monitoring and energy efficiency of workpiece processing.

3. For the problem that the total energy consumption of the cutting energy consumption step is difficult to obtain in the whole process of the workpiece processing, the present invention provides a method for dividing the total energy consumption of the cutting energy consumption process into a plurality of cutting energy consumption steps in the whole process of workpiece processing. Consumption, and the energy consumption of cutting energy consumption is divided into no-load energy consumption, cutting energy consumption and additional load energy consumption respectively. The method is simple and easy to apply to all machine tools.

4. The invention provides a method for energy consumption sharing of workshop auxiliary equipment, which provides a new calculation method for the energy consumption of the workshop auxiliary equipment of the workpiece, and the calculation method is simple and practical.

DRAWINGS

Fig. 1 is a flow chart of a method for formulating the energy consumption quota of a machining shop in the present invention.

Figure 2 is a schematic view showing the structure of a gear in Example 1 of the present invention.

3a and 3b are a front view and a plan view of a blank of a gear in Example 1 of the present invention.

Figure 4 is a perspective view of the blank of the gear of Example 1 of the present invention.

Figure 5 is a perspective view of a tooth of a gear in Example 1 of the present invention.

Figure 6 is a graph showing the energy consumption function of the machine tool in Example 1 of the present invention.

Figure 7 is a graph showing the no-load energy consumption function of the machine tool in Example 1 of the present invention.

detailed description

The invention provides a method for formulating the energy consumption quota of the workpiece in the machining workshop, which divides the whole process of the workpiece processing into a standby energy consumption step, a start energy consumption step, an empty load energy step, a cutting energy consumption step, The energy consumption between the stop energy consumption step, the transfer energy consumption step and the workshop auxiliary equipment is calculated, and the energy consumption of the six types of work steps and the workshop auxiliary equipment is calculated separately to obtain the energy consumption quota of the workpiece. The specific implementation method of the method is as follows:

1. Establishment of an energy-based basic database:

According to the energy consumption equipment of the workshop, the energy consumption basic database is pre-established, including: standby power database, startup energy consumption database, no-load power database, load loss coefficient database, transfer power database and workshop auxiliary equipment power database; The energy consumption quota will not need to establish an energy consumption basic database. If the workshop purchases new equipment, it only needs to establish an energy consumption basic database for the new equipment, and the energy consumption base database is established once for long-term use. The establishment of the energy consumption basic database is as follows:

1.1 The establishment of the standby power database:

The power analyzer is mounted on the machine tool, the standby power P _{sb is} measured, and the standby power P _sb of each machine tool and the unique identification of each machine tool are stored to establish a standby power database.

1.2 Start the establishment of the energy consumption database:

The startup energy consumption database is divided into an ordinary machine startup energy consumption database and a numerical control machine startup energy consumption function database.

1.2.1 Establishment of an ordinary machine tool start energy consumption database:

The power analyzer is mounted on the machine, measured at different positions of each machine speed value n corresponding to the start energy E _su, the energy E _su start value n of the speed gear and each of the machine should be The unique identification of an ordinary machine tool establishes a common machine start energy consumption database.

1.2.2 The establishment of the energy consumption function library of the CNC machine start:

The power analyzer is installed on the machine tool, and the starting energy consumption E _su corresponding to the speed value n of each gear position of each machine tool is measured, and each speed value recorded by the machine tool is determined by a quadratic function of the speed value as an independent variable. The starting energy consumption corresponding to n is fitted to obtain the starting energy consumption function of the numerical control machine tool: E _su = x ₁ n ² + x ₂ n + x ₃ , the starting energy consumption function of each machine tool and each The unique identifier of the machine tool is stored to establish a database of startup energy consumption functions, wherein x ₁ , x ₂ , and x ₃ represent correlation coefficients of the fitting function;

1.3 Establishment of the no-load power database:

The no-load power database is divided into an ordinary machine tool no-load power database and a numerical control machine tool no-load power function database.

1.3.1 Establishment of the no-load power database of ordinary machine tools:

The power analyzer is mounted on the machine, measured at different positions of each machine speed values corresponding to the n P _un-load power, the power P _un idling of the machine should shift speed and for each value of n The unique identification of an ordinary machine tool establishes a general machine tool no-load power database.

1.3.2 Establishment of the no-load power function library of CNC machine tools:

The power analyzer is installed on the machine tool, and the no-load power P _un corresponding to the speed value n of each gear position of each machine tool is measured, and each speed value recorded by the machine tool is determined by a quadratic function of the speed value as an independent variable. The no-load power corresponding to n is fitted to obtain the no-load power function of the numerically controlled machine tool: P _un = y ₁ n ² + y ₂ n + y ₃ , and the no-load power function of each machine tool and each The unique identification of the machine tool is stored to create a database of no-load power functions, where y ₁ , y ₂ , y ₃ represent the correlation coefficients of the fitted function.

1.4 Establishment of the load loss coefficient database:

There are many methods for obtaining the load loss coefficient, such as experimental measurement method, machine tool analog correction measurement method, theoretical calculation method, etc. However, each method has its own advantages and disadvantages. The experimental measurement method can be applied to the measurement of most machine load loss coefficient. The measured coefficient error is small and widely used, but it cannot be measured on the hobbing machine. The machine analog correction measurement method can be applied to the measurement of the load loss coefficient of all machine tools, but the method is complicated to operate and difficult to implement; theoretical calculation method It has a wide application range and simple operation, but it has a large calculation error for the load loss coefficient of some machine tools.

The invention takes the experimental measurement method as an example, and introduces the establishment process of the load loss coefficient database in detail.

The cutting force F _v or the cutting torque M _{z of} each machine tool during cutting is measured, and the corresponding cutting power P _{c is} calculated according to the formula P _c =F _v ×v _c or P _c =M _z ×2πn. The no-load power P _un cut by each machine tool and the total power P _{ma of the} cutting process are measured. The speed is freely selected in each speed of the machine tool, and different cutting experiments of k groups (k≥2) are performed. The corresponding P _ma and P _un values are measured, and the cutting power corresponding to the k group of experiments is calculated according to the experimental parameters. _c . The experimental results show that the k-group no-load power P _unk , the cutting power P _ck , the total machining power P _{mak is} substituted into the formula P _mak =P _unk +P _ck +P _ak , where P _ak is the additional load loss power and the additional load loss The power P _ak =αP _ck , and then P _mak =P _unk +(1+α)P _ck , can calculate the load loss coefficient α at different speeds of the machine tool, and the load loss coefficient according to each speed of each machine tool. α and a unique identifier establish a database of load loss factors.

Establishment of 1.5 stop power database:

The stopping power between stops of each machine is approximately equal to the standby power value, ie P _pa =P _sb . Therefore, it is not necessary to establish a stop power database, and only need to retrieve the value in the corresponding standby power database according to the selected machine when using.

1.6 Establishment of the transfer power database:

The rated power P _tr corresponding to the transfer equipment (eg, driving, forklift, etc.) in the workshop is measured, and the rated power P _tr of each transfer device and the unique identifier of each transfer device are stored to establish a transfer power database.

1.7 Establishment of workshop auxiliary equipment power database:

The auxiliary equipment commonly used in the workshop mainly includes: lighting, fan, compressor and air conditioner. By obtaining the rated power P _ap of each auxiliary equipment in the workshop, the workshop auxiliary equipment power database is established according to the rated power of the workshop equipment corresponding to the workshop and the unique identification.

2. Calculation of energy consumption and sharing energy consumption:

2.1 Calculation data acquisition:

According to the workpiece process plan, the energy consumption steps required for machining the workpiece are classified and the quantity is determined, and the calculation data related to the energy consumption of various work steps are obtained, including: the standby time of the machine with the standby energy consumption step, the startup energy consumption The spindle speed of the machine tool of the step, the spindle speed of the machine tool with no-load energy consumption step and the running time of the no-load, the spindle speed of the machine tool for cutting energy consumption, the feed amount, the amount of cutting knife and the cutting time, the workpiece material, etc. Stoppage time between machine tools for stopping energy consumption, transfer equipment and transfer time for energy transfer steps, and rated power and working time of workshop auxiliary equipment.

2.2 Energy consumption calculation:

The whole process of workpiece processing is divided into standby energy consumption step, start energy consumption step, no-load energy step, cutting energy step, intermittent energy step, transfer energy step and workshop auxiliary equipment energy consumption. The allocation is calculated separately for the energy consumption of the six types of work steps and workshop auxiliary equipment.

2.2.1 Energy consumption of standby energy consumption steps:

Find the standby power P _sbi corresponding to the standby power database and the standby time t _sbi obtained by the process plan, and calculate the energy consumption of the machine standby energy consumption step according to the formula E _sbi =P _sbi ×t _sbi .

2.2.2 Energy consumption for starting energy consumption steps:

The startup energy consumption E _sui corresponding to the speed value n _i selected by the machine tool is searched from the startup energy consumption database.

2.2.3 Energy consumption of no-load energy consumption steps:

Finding the no-load power P _uni corresponding to the speed value n _i selected by the machine tool from the no-load power database or substituting the speed value n _i into the corresponding no-load function can obtain the corresponding P _uni and obtain the process plan The no-load time t _uni , according to the formula E _uni =P _uni ×t _uni, calculates the energy consumption of the no-load energy consumption step of the machine tool.

2.2.4 Energy consumption for cutting energy consumption steps:

According to the inventor's research, the energy consumption E _mai of the cutting energy consumption step is composed of three parts: the no-load energy consumption E _uni , the cutting energy consumption E _ci and the additional load energy consumption E _ai in the cutting process, and therefore has the following formula:

The method of obtaining P _ci is as follows: according to the existing formula

Where F _ci , a _p , f, v _c are cutting force, knife depth, feed rate, cutting speed, respectively.

For the corresponding coefficient, index, and correction factor, the cutting force F _ci can be obtained by looking up the table, and the cutting power can be obtained according to the formula P _ci =F _ci ×v _ci , where v _ci is the cutting speed and can be obtained from the process plan. Obtained in the calculation data. At the same time, the load loss coefficient α _i and the no-load power P _uni can be obtained by looking up the database corresponding thereto. Therefore, the energy loss E _mai of the cutting energy consumption step can be calculated.

2.2.5 Energy consumption for stopping energy consumption steps:

The stop energy consumption step refers to the energy consumption step when the workpiece machining process temporarily stops the spindle due to the change of the rotational speed or re-clamping. During the stop, the power of the machine tool is equal to the machine power during standby, that is, P _pai =P _sbi , only It is necessary to find the standby power P _sbi corresponding to the standby power database and the intermittent time t _pai obtained by the process plan, and calculate the intermittent energy consumption step of the machine tool according to the formula E _pai =P _pai ×t _pai Energy consumption.

2.2.6 Energy consumption for transporting energy consumption steps:

Determine the transfer device corresponding to the workpiece, find the corresponding rated power P _tri of the transfer device in the transfer power database, and obtain the transfer time t _tri obtained by the process plan, then the total energy consumption of the workpiece is E _{tri_n} =P _tri ×t _tri . If the transfer device transports n workpieces at a time, the energy consumption per unit workpiece is E _tri =E _{tri_n} /n.

2.2.7 Sharing energy consumption of workshop auxiliary equipment:

After determining the processing workshop, find the rated power P _api of the corresponding workshop auxiliary equipment from the workshop auxiliary equipment power database, and obtain the processing time of the batch of workpieces in the workshop through the process plan, that is, the auxiliary equipment in the workshop. Working time t _ap , the rated total power of the auxiliary energy-consuming equipment for all work in the workshop

The total energy consumption of the shop auxiliary equipment can be calculated by the formula E _{ap_n} =P _{ap_n} ×t _ap .

A workshop may have multiple workpieces processed in the workshop at the same time. The total energy consumption of the workshop auxiliary equipment is shared by multiple workpieces. The principle of energy consumption sharing is based on the proportion of processing time of a certain workpiece to the total processing time of all workpieces. According to the production plan of the workpiece, the total processing time of the workpiece in the workshop is t _ap and the number of workpieces processed is n _ap , and the total processing time t _i ' of each other type of workpiece in the total processing time t _ap is obtained and processed. The number of workpieces N _i ', the energy consumption of the auxiliary energy-consuming equipment in the workshop is allocated to the allocated energy consumption of the batch of workpieces (called workshop auxiliary equipment sharing energy consumption)

3. Formulation of workpiece energy consumption quota:

On the basis of the above steps, the energy consumption of the standby, start, no load, cutting, stop, transfer energy consumption steps and the auxiliary energy consumption of the workshop auxiliary equipment are respectively substituted into the following formula:

The total energy required for the entire machining process of the workpiece can be determined, ie the energy consumption rating of the workpiece.

Example:

Referring to Figure 2-5, the whole process of gear machining is completed in three parts, namely the processing of blank residual material, the machining of the blank and the hobbing. According to the design drawings and the machining process plan, the machine tools of the three processing stages are selected as CD6140A, GSK980TDb and YE3120CNC7. The standby power database, the startup energy database, the no-load power database, the load loss coefficient database, the transfer power database, and the workshop auxiliary equipment sharing energy consumption database need to be established in advance. However, in this example, the transfer process of the workpiece is manually transferred. The external processing conditions of the workpiece have lower requirements on the auxiliary equipment such as lighting and air conditioning in the workshop. Therefore, the energy consumption of the workpiece and the energy consumption of the workshop auxiliary equipment are Ignore it in this case. Therefore, it is only necessary to retrieve the standby power, startup energy consumption, no-load power, and load loss coefficient from the energy consumption basic database. The four types of energy consumption basic database establishment processes used are as follows:

1. Establishment of the basic database of energy consumption:

This case pre-established the standby power database, startup energy database, no-load power database, and load loss coefficient database of CD6140A, GSK980TDb and YE3120CNC7.

The standby power database is established according to the method described in step 1.1 of the implementation method. The standby energy consumption of the CD6140A, GSK980TDb and YE3120CNC7 can be found and retrieved from the standby energy consumption database. The standby power of the three machine tools is P _{sb_CD6140A} =180w, P _{sb_GSK980TDb} =200w and P _{sb_YE3120CNC7} =945w.

The startup energy consumption database is established according to the method described in step 1.2 of the implementation method, taking YE3120CNC7 as an example (the establishment method of the startup energy consumption database of the other two machine tools is similar and the database establishment process is omitted). Select the speed points of each level to measure the starting energy consumption at each speed, as shown in Figure 6, and fit the starting energy consumption function E _sui between 640r/min-800r/min, E _sui =0.8138n _i ² -1060.46n _i +377472.2. In this case the workpiece spindle speed selected 720r / min, the speed of the start-energy into the library, the energy available to start the E _su YE3120CNC7 = 36368J. In the same way, the startup energy consumption database of the machine tools CD6140A and GSK980TDb can be established and the startup energy consumption of the corresponding machine tool spindle speed can be obtained.

The no-load energy consumption database is established according to the method described in step 1.3 of the implementation method, taking YE3120CNC7 as an example. Select the speed points of each level and measure the no-load power at each speed, as shown in Figure 7, and fit the no-load power function P _uni , P _uni =0.03125n between 640r/min-800r/min. _i ² -39.45n _i +18128. In this case, the spindle speed of the machine tool is 720r/min, and the speed is brought into the above-mentioned no-load power function library, and the no-load power of YE3120CNC7 is P _un =5924w. In the same way, the no-load power database of the machine tools CD6140A and GSK980TDb can be established and the no-load power of the corresponding machine spindle speed is obtained.

Similarly, for the CD6140A and GSK980TDb machines, it is only necessary to pre-measure the cutting force F _v , the no-load power P _un and the total power P _ma when machining any workpiece and establish the additional load of the CD6140A and GSK980TDb machine tools according to the method described in the implementation method 1.4. Loss base database. Although the load loss factor of the same machine tool at different spindle speeds is different, the additional load energy consumption accounts for a small proportion of the energy consumption of the cutting energy consumption step, and the load loss coefficient of the same machine tool at different spindle speeds The difference is small, so the load loss coefficients of the same machine at different speeds are approximately equal, ie α _CD6140A = 0.1822, α _GSK980TDb = 0.1939. At the same time, the load loss coefficient of the hobbing machine YE3120CNC7 is based on the previous study α _YE3120CNC7 = 0.1856.

2. Calculation of energy consumption in the whole process of workpiece processing:

After obtaining the calculation data of the machine tool, the energy consumption of the required energy consumption steps in the whole process of the workpiece machining can be calculated. The main parameters of the three machine tools and workpieces in the machining process plan are shown in Table 1 and Table 2. Among them, Table 1 is the main parameters of the machine tool, and Table 2 is the main parameters of the workpiece.

Table 1 Main parameters of machine tools

machine tool	CD6140A	GSK980TDb	YE3120CNC7
				Spindle speed r/min	11-1400	0—9999	100-1500/2000
Main (servo) motor / kW	7.5	7.5	10.56
				Maximum processing modulus / mm	——	——	4/5
Processing diameter (mm)	——	——	Φ210

Table 2 Main parameters of the workpiece

Workpiece material	Hob material	Number of teeth	Modulus	pressure angle	Head count
						45 # steel	G30	36	2mm	20°	2

According to the design drawing and processing scheme of the workpiece, Table 3 shows the detailed machining process, processing parameters and energy consumption of the workpiece.

Table 3 workpiece processing

According to the energy consumption basic database of each energy-consuming equipment and the processing process of the workpiece, combined with the above specific implementation method, the energy consumption of the standby, start, no-load, cutting, and intermittent energy-consuming steps can be calculated, as follows:

Therefore, the workpiece energy consumption quota for the whole process is as follows:

E _Quota =E _SB +E _SU +E _UN +E _MA +E _PA =0.4212kw·h

The actual energy consumption of the workpiece processing process is actually measured by the power analyzer as E'=0.4568kw·h, then the error of the energy consumption quota of the workpiece is

Understandably, because the energy consumption law of the mechanical manufacturing system is extremely complicated, there are many influencing factors, and the random variation is large, and the error within 10% is enough to meet the actual needs. It is to be noted that the present examples are merely illustrative of the present invention, and are merely examples of the present invention, which are not intended to limit the scope of the present invention.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation made by the specification and the drawings of the present invention may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims (3)

1. A method for formulating a workpiece energy consumption quota in a machining shop, characterized in that it comprises the following steps:

   (1) Pre-establishing an energy consumption basic database according to the workshop equipment, including: standby power database, startup energy consumption database, no-load power database, load loss coefficient database, transfer power database, and workshop auxiliary equipment power database;

   (2) According to the workpiece process plan, the energy consumption steps required for machining the workpiece are classified and the quantity is determined, and the calculation data related to the energy consumption of various work steps are obtained, including: the standby time of the machine tool of the standby energy consumption step, The spindle speed of the machine tool that starts the energy consumption step, the spindle speed of the machine tool with no-load energy consumption step and the running time of the no-load, the spindle speed of the machine tool for cutting the energy consumption step, the feed amount, the amount of the back-feeding knife and the cutting time, and the workpiece material Etc., stop time between machine tools for stopping energy consumption steps, transfer equipment and transit time for transferring energy consumption steps, and data such as rated power and working time of workshop auxiliary equipment;

   Then calculate and obtain the energy consumption of various energy-consuming steps such as standby, start-up, no-load, cutting, stop, transfer, and the auxiliary energy consumption of the workshop auxiliary equipment;

   (3) Calculate the total energy required for the whole process of the workpiece by summing up the energy consumption of all the steps and the energy consumption. The energy consumption quota of the workpiece is calculated. The calculation method of the energy consumption quota of the workpiece is as follows:

   

   Among them: E _Quota represents the workpiece energy consumption quota, E _sbi , E _sui , E _uni , E _mai , E _pai , E _tri and E _ap respectively represent the ith standby , start , no load , cutting , stop , transfer energy consumption The energy consumption of the step and the workshop auxiliary equipment of the unit workpiece share the energy consumption, N _SB , N _SU , N _UN , N _MA , N _PA , and N _TR respectively indicate standby, start, no load, cutting, stop, transfer energy The number of steps consumed, i represents the serial number of the energy step.
2. The method for formulating a workpiece energy consumption quota of a machining shop according to claim 1, wherein the total energy consumption E _{MA of the} cutting energy consumption step is performed by a plurality of machine tools involved in the whole process of the workpiece processing, and a plurality of cutting energy consumption steps. The energy consumption component; wherein the energy consumption E _mai of a single cutting energy consumption step is composed of three parts: the no-load energy consumption E _uni , the cutting energy consumption E _ci and the additional load energy consumption E _ai in the cutting energy consumption step, The total energy consumption of the cutting energy consumption step in the whole process of workpiece machining is defined by the formula:

   

   Calculated acquisition, wherein the additional load power P _ai and the cutting power P _ci adopt a linear function relationship P _ai =α _i P _ci , P _ci =F _ci ×v _ci , the load loss coefficient α _i and the no-load power P _uni database lookup to obtain the corresponding cutting time t _mai process scheme can be obtained from, and may be calculated to obtain the cutting force P _ci F _ci, cutting speed v _ci process scheme according to the data.
3. The development of the energy consumption of a machine shop work fixed claim, characterized in that: after determining the shop, to find the corresponding plant auxiliary power rating P _api each auxiliary power plant from the database, and by a process obtain the batch time of the machining work in the workshop, the workshop is the operating time t of the auxiliary equipment rated total power _ap, auxiliary equipment power consumption of all the work shop

   

   The total energy consumption of the workshop auxiliary equipment can be calculated by the formula E _{ap_n} =P _{ap_n} ×t _ap ; the workshop has a variety of workpieces processed in the workshop at the same time, and the total energy consumption of the workshop auxiliary equipment is shared by various workpieces. The consumption and distribution is divided according to the ratio of one of the workpiece processing time to the total processing time of all the workpieces. According to the production plan of the workpiece, the total processing time of the workpiece in the workshop is t _ap and the number of workpieces processed is n _ap , and Obtaining the total processing time t _i ' of each other type of workpiece in the total machining time t _ap and the number of machining workpieces N _i ', the energy consumption of the auxiliary energy-consuming equipment in the workshop is allocated to the allocated energy consumption of the batch of workpieces ( Said workshop auxiliary equipment to share energy consumption)

   

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