A special machine tool for valve and processing method

Abstract

The present invention relates to the field of machine tool processing technology, and in particular to a valve-specific machine tool and processing method, including step S1, clamping a valve blank and starting the valve-specific machine tool processing; step S2, detecting the thermal imaging image of the valve blank to determine the real-time workpiece temperature, and determining whether to adjust the current feed speed in the processing program according to the current processing method; step S3, determining whether to insert a tool retracting and pausing processing operation according to the real-time workpiece over-temperature area; step S4, determining whether to insert a tool retracting operation and a tool head switching operation according to the real-time tool head temperature. The present invention integrates multiple functions such as turning, drilling, milling, boring, and tapping into a valve-specific machine tool, and cooperates with a spindle indexing chuck to complete the processing of complex parts in one clamping, thereby improving processing efficiency and precision. At the same time, accurate temperature control and determination are performed for the continuous processing process to avoid thermal expansion of the workpiece and the machine tool part, resulting in thermal displacement and processing precision errors.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tool processing, and in particular to a special machine tool for valves and a processing method thereof. Background Art

[0002] Valves are key components for controlling fluid flow and are widely used in industries such as petroleum, chemical, electric power, and metallurgy. There are many types of valves, including gate valves, stop valves, ball valves, butterfly valves, etc. Different types of valves have different processing requirements. Generally speaking, valves include machining processes. Generally, the blanks of cast or forged valve parts are placed in the processing machine tools, and the shape and inner cavity of round parts such as valve bodies and valve covers are processed by turning; the flange surface, mounting surface, and connection parts of the valves are processed on the milling machine by milling; through drilling and tapping: the holes of valve parts are processed on the drilling machine, such as threaded holes, through holes, and blind holes; but since the machining process of valves is cumbersome, different types of processing machine tools will be used. The valves involve multiple clamping during the machining process, which leads to inaccurate machining positioning, so that the valves cannot achieve high machining accuracy.

[0003] Chinese patent publication number: CN114434150A, discloses a turret multi-station valve CNC machining machine tool; its technical point is to integrate turning, drilling, chamfering and other processing into the same machine tool, one-time clamping, multi-dimensional surface automatic progressive high-precision and high-quality completion of the tedious process of the valve, improve the processing accuracy; it can be seen that in the existing valve machining technology, a composite machining method has been developed to improve the processing accuracy and processing efficiency, but because the workpiece is always in a continuous processing state, the workpiece and the machine tool will produce a large degree of temperature rise, resulting in thermal expansion of the workpiece and the machine tool, resulting in thermal displacement and affecting the processing accuracy. Summary of the invention

[0004] To this end, the present invention provides a valve-specific machine tool and a processing method to overcome the problem in the prior art that thermal displacement is easily generated during continuous compound processing of valves, thereby affecting the processing accuracy.

[0005] To achieve the above object, the present invention provides a method for machining a valve-specific machine tool, comprising:

[0006] Step S1, clamping the valve blank to be processed on the indexing chuck of the valve-specific machine tool, and starting the valve-specific machine tool to machine the valve blank according to a set processing program;

[0007] Step S2, using a thermal imaging device to detect in real time the thermal imaging image of the valve blank being machined, extracting the maximum temperature value in the image as the real-time workpiece temperature for determination, and when the real-time workpiece temperature is greater than the standard machining temperature and the current machining mode is fixed-point machining, adjusting the current feed speed in the machining program;

[0008] Step S3, when the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is surface processing, the area of ​​the portion of the thermal imaging image whose temperature value is greater than the standard processing temperature is obtained as the real-time workpiece over-temperature area, and when the real-time workpiece over-temperature area is greater than the standard processing affected area, a tool retraction operation and a processing pause operation are inserted at the current node of the processing program;

[0009] Step S4, when the real-time workpiece temperature is less than or equal to the standard processing temperature, the real-time tool head temperature of the current processing tool head is obtained, and when the real-time tool head temperature of the current processing tool head is less than or equal to the standard tool head temperature, the processing program is not adjusted until the valve-specific machine tool executes the set processing program and completes the machining of the valve blank;

[0010] In the step S4, if the real-time tool head temperature of the current machining tool head is greater than the standard tool head temperature, a tool retracting operation and a tool head switching operation are inserted into the current node of the machining program.

[0011] Furthermore, in step S2, a standard processing temperature is set, a thermal imaging image of the valve blank is obtained in real time by the thermal imaging device, and the maximum temperature value in the image is extracted as the real-time workpiece temperature, and the real-time workpiece temperature is determined according to the standard processing temperature.

[0012] If the real-time workpiece temperature is less than or equal to the standard processing temperature, the real-time temperature of the current processing tool head is obtained to determine whether to adjust the processing program;

[0013] If the real-time workpiece temperature is greater than the standard processing temperature, the current processing mode will be obtained for determination to determine whether the processing program should be adjusted.

[0014] Furthermore, when the real-time workpiece temperature is greater than the standard processing temperature, the current processing mode in the processing program will be determined.

[0015] If the current processing mode is surface processing, the real-time over-temperature area of ​​the workpiece will be obtained for determination to determine whether to adjust the processing program;

[0016] If the current processing mode is fixed-point processing, the current feed speed in the processing program will be adjusted according to the real-time workpiece temperature and the standard processing temperature;

[0017] Among them, surface processing includes turning operations, milling operations and boring operations; fixed-point processing includes drilling operations and tapping operations.

[0018] Furthermore, in step S3, a standard processing influence area is set. When the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is surface processing, the area of ​​the portion of the thermal imaging image whose temperature value is greater than the standard processing temperature is obtained as the real-time workpiece over-temperature area, and the real-time workpiece over-temperature area is determined according to the standard processing influence area.

[0019] If the real-time over-temperature area of ​​the workpiece is less than or equal to the standard processing affected area, the processing program will not be adjusted;

[0020] If the real-time over-temperature area of ​​the workpiece is larger than the standard processing affected area, a tool retraction operation and a processing pause operation will be inserted at the current node of the processing program.

[0021] Furthermore, in step S2, a minimum feed speed is set. When the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is fixed-point processing, the target feed speed is calculated according to the real-time workpiece temperature and the standard processing temperature, and the target feed speed is compared with the minimum feed speed.

[0022] If the target feed rate is greater than or equal to the minimum feed rate, adjusting the current feed rate in the machining program to the calculated target feed rate;

[0023] If the target feed rate is less than the minimum feed rate, the current feed rate in the machining program is adjusted to the minimum feed rate, and the coolant spray rate of the spray device in the real-time valve dedicated machine tool is adjusted;

[0024] Among them, Vf=Vc×(Tb / Ts), Vf is the target feed speed, Vc is the current feed speed in the processing program, Tb is the standard processing temperature, and Ts is the real-time workpiece temperature.

[0025] Further, when the calculated target feed speed is less than the minimum feed speed, the coolant spray rate of the current processing is obtained in the processing program, and the coolant spray rate of the current processing is adjusted according to the target feed speed and the minimum feed speed;

[0026] Among them, Pc'=Pc×[1+(Vm-Vf) / Vm], Pc is the coolant spray rate of the current processing, Pc' is the adjusted coolant spray rate, Vm is the minimum feed speed, and Vf is the target feed speed.

[0027] Furthermore, in step S4, a standard tool head temperature is set. When the real-time workpiece temperature in the thermal imaging image is less than or equal to the standard processing temperature, the real-time tool head temperature of the current processing tool head is obtained through the set temperature sensor, and the real-time tool head temperature is determined according to the standard tool head temperature.

[0028] If the real-time tool head temperature of the current processing tool head is less than or equal to the standard tool head temperature, the processing program is not adjusted;

[0029] If the real-time tool head temperature of the current machining tool head is greater than the standard tool head temperature, a tool retracting operation and a tool head switching operation will be inserted at the current node of the machining program;

[0030] Among them, the tool head switching operation switches the tool head with the same size type as the tool head used by the current node.

[0031] The present invention also provides a valve-specific machine tool, which is applied to a processing method of any of the above-mentioned valve-specific machine tools, comprising:

[0032] The bed has an X-axis sliding guide on one side;

[0033] A spindle box is arranged at one end of the bed, a rotatable spindle is arranged in the spindle box, a driving motor for providing rotational power is arranged at one end of the spindle, and a dividing chuck for clamping and fixing the valve blank to be processed is arranged at the other end of the spindle;

[0034] A conical tool magazine is arranged on one side of the bed, and is a one-piece conical tool magazine for installing a number of BBT40 tool handles, taps and U drills;

[0035] A mobile processing assembly is arranged on the X-axis sliding guide rail and can be horizontally moved on the X-axis sliding guide rail to perform machining operations on the clamped valve blank;

[0036] The control center is connected to the spindle box, the conical tool magazine and the mobile processing assembly respectively, and is used to store the set processing program and control the operation and processing of each component according to the processing program.

[0037] Furthermore, the mobile processing assembly includes a hydraulic servo turret equipped with a plurality of turning tools, an electric spindle with a rotational power output, and a spray device arranged on one side of the electric spindle and capable of spraying a coolant.

[0038] Furthermore, a shaft-fixing block is arranged inside the spindle box, and the shaft-fixing block is used to wrap the spindle with a circular cross-section; and evenly distributed grooves are arranged on the outer side of the shaft-fixing block.

[0039] Compared with the prior art, the beneficial effect of the present invention lies in that, through the CNC setting program, the valve professional machine tool can be controlled to machine the valve blank according to the process requirements, and by introducing the hot forming equipment, the valve blank workpiece in the processing process can be subjected to real-time thermal imaging detection, and the temperature in the detection result can be judged. At the same time, multiple judgments are made according to the processing type, over-temperature area or tool head temperature under different temperature conditions to determine whether to adjust the processing program of the current node to reduce the feed, add a pause or switch the tool head, so as to accurately control the temperature of the processed workpiece valve, thereby reducing the thermal expansion of the valve workpiece and the machine tool fixture in the continuous composite processing of the valve, ensuring the accuracy of the processing positioning of the valve workpiece, and improving the processing accuracy of the valve blank.

[0040] Furthermore, by introducing thermal imaging technology and taking the highest temperature point of the thermal imaging image of the valve blank as the real-time workpiece temperature, it is possible to avoid local overheating of the workpiece and cause processing defects in the workpiece. At the same time, it is also possible to quickly determine the temperature of the actual processing position during fixed-point processing, so that the real-time workpiece temperature involved in the judgment can more accurately reflect the temperature state of the workpiece, thereby improving the accuracy of temperature judgment and control.

[0041] Furthermore, when the real-time workpiece temperature is greater than the standard processing temperature, it is necessary to determine the current processing mode in the processing program. If it is a surface processing of turning, milling and boring operations, the specific processing position is increased in range. Therefore, the actual temperature state of the workpiece can be determined based on the judgment of the real-time workpiece over-temperature area. For fixed-point processing of drilling and tapping operations, the real-time workpiece temperature can be directly controlled by reducing the current feed speed, which can not only ensure the stability of the workpiece temperature, but also effectively reduce breakage during tapping operations.

[0042] Furthermore, when the current processing method is surface processing, it is a rapid material reduction operation, so a certain high-temperature area will be generated at the tool. If the real-time over-temperature area of ​​the workpiece is larger than the standard processing influence area, it is determined that the over-temperature area has exceeded the range of tool processing influence, that is, the problem of workpiece overheating has occurred. Therefore, by inserting the tool retraction operation and the pause processing operation at the current node of the processing program, the workpiece is cooled to a certain extent, reducing the thermal expansion of the valve workpiece and the machine tool fixture, ensuring the accuracy of the valve workpiece processing positioning, and at the same time improving the processing accuracy of the valve blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a flow chart of the processing method of the valve-specific machine tool of this embodiment;

[0044] Figure 2 This is a schematic diagram of the structure of the valve-specific machine tool of this embodiment;

[0045] Figure 3 This is a schematic diagram of the structure of the mobile processing assembly of this embodiment;

[0046] Figure 4 It is a schematic diagram of the structure of the main shaft in the spindle box of the valve-specific machine tool in this embodiment. DETAILED DESCRIPTION

[0047] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0049] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0050] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] See also Figure 1 As shown, it is a flow chart of a processing method of a valve-specific machine tool in this embodiment. This embodiment provides a processing method of a valve-specific machine tool, including:

[0052] Step S1, clamping the valve blank to be processed on the indexing chuck of the valve-specific machine tool, and starting the valve-specific machine tool to machine the valve blank according to a set processing program;

[0053] Step S2, using a thermal imaging device to detect in real time the thermal imaging image of the valve blank being machined, extracting the maximum temperature value in the image as the real-time workpiece temperature for determination, and when the real-time workpiece temperature is greater than the standard machining temperature and the current machining mode is fixed-point machining, adjusting the current feed speed in the machining program;

[0054] Step S3, when the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is surface processing, the area of ​​the portion of the thermal imaging image whose temperature value is greater than the standard processing temperature is obtained as the real-time workpiece over-temperature area, and when the real-time workpiece over-temperature area is greater than the standard processing affected area, a tool retraction operation and a processing pause operation are inserted at the current node of the processing program;

[0055] Step S4, when the real-time workpiece temperature is less than or equal to the standard processing temperature, the real-time tool head temperature of the current processing tool head is obtained, and when the real-time tool head temperature of the current processing tool head is less than or equal to the standard tool head temperature, the processing program is not adjusted until the valve-specific machine tool executes the set processing program and completes the machining of the valve blank;

[0056] In the step S4, if the real-time tool head temperature of the current machining tool head is greater than the standard tool head temperature, a tool retracting operation and a tool head switching operation are inserted into the current node of the machining program.

[0057] Through the CNC setting program, the valve professional machine tool can be controlled to machine the valve blank according to the process requirements, and the valve blank workpiece in the processing process can be inspected by real-time thermal imaging by introducing hot forming equipment, and the temperature in the inspection result can be judged. At the same time, multiple judgments are made according to the processing type, over-temperature area or tool head temperature under different temperature conditions to determine whether to adjust the processing program of the current node to reduce the feed, add a pause or switch the tool head to accurately control the temperature of the processed workpiece valve, so as to reduce the thermal expansion of the valve workpiece and the machine tool fixture in the continuous compound processing of the valve, ensure the accuracy of the processing and positioning of the valve workpiece, and improve the processing accuracy of the valve blank.

[0058] Specifically, in step S2, a standard processing temperature is set, a thermal imaging image of the valve blank is obtained in real time by the thermal imaging device, and the maximum temperature value in the image is extracted as the real-time workpiece temperature, and the real-time workpiece temperature is determined according to the standard processing temperature.

[0059] If the real-time workpiece temperature is less than or equal to the standard processing temperature, the real-time temperature of the current processing tool head is obtained to determine whether to adjust the processing program;

[0060] If the real-time workpiece temperature is greater than the standard processing temperature, the current processing mode will be obtained for determination to determine whether the processing program should be adjusted.

[0061] In this embodiment, the standard processing temperature is set according to the material of the valve blank to be processed. Taking the valve blank made of ordinary steel and cast iron as an example, the surface temperature during the processing is between 200°C and 500°C, and by controlling the processing process, most of the machining of the valve blank can be completed below 320°C. Therefore, the standard processing temperature can be set to 320°C. The actual setting also needs to be adjusted in combination with the processing tool and processing parameters. For different valve blank materials, standard processing temperatures need to be selected in different temperature ranges. For example, for processing with cemented carbide and high-speed steel tools, the surface temperature can reach 500°C to 800°C, or for other difficult-to-process materials such as stainless steel, the surface processing temperature will be higher, which will not be repeated here.

[0062] By introducing thermal imaging technology and taking the highest temperature point of the thermal imaging image of the valve blank as the real-time workpiece temperature, it is possible to avoid local overheating of the workpiece and cause processing defects in the workpiece. At the same time, it is also possible to quickly determine the temperature of the actual processing position during fixed-point processing, so that the real-time workpiece temperature involved in the judgment can more accurately reflect the temperature state of the workpiece, thereby improving the accuracy of temperature judgment and control.

[0063] Specifically, when the real-time workpiece temperature is greater than the standard processing temperature, the current processing mode in the processing program will be determined.

[0064] If the current processing mode is surface processing, the real-time over-temperature area of ​​the workpiece will be obtained for determination to determine whether to adjust the processing program;

[0065] If the current processing mode is fixed-point processing, the current feed speed in the processing program will be adjusted according to the real-time workpiece temperature and the standard processing temperature;

[0066] Among them, surface processing includes turning operations, milling operations and boring operations; fixed-point processing includes drilling operations and tapping operations.

[0067] When the real-time workpiece temperature is greater than the standard processing temperature, the current processing mode in the processing program needs to be determined. If it is a surface processing of turning, milling and boring operations, the specific processing position is increased in range. Therefore, the actual temperature state of the workpiece can be determined based on the judgment of the real-time workpiece over-temperature area. For fixed-point processing of drilling and tapping operations, the real-time workpiece temperature can be directly controlled by reducing the current feed speed, which can not only ensure the stability of the workpiece temperature, but also effectively reduce breakage during tapping operations.

[0068] Specifically, in step S3, a standard processing influence area is set. When the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is surface processing, the area of ​​the portion of the thermal imaging image whose temperature value is greater than the standard processing temperature is obtained as the real-time workpiece over-temperature area, and the real-time workpiece over-temperature area is determined according to the standard processing influence area.

[0069] If the real-time over-temperature area of ​​the workpiece is less than or equal to the standard processing affected area, the processing program will not be adjusted;

[0070] If the real-time over-temperature area of ​​the workpiece is larger than the standard processing affected area, a tool retraction operation and a processing pause operation will be inserted at the current node of the processing program.

[0071] In this embodiment, the set standard processing influence area is affected by the cutter head size and the processing speed. In this embodiment, it is set to 230 square millimeters and can be adaptively adjusted according to the cutter head size and the processing speed.

[0072] When the current processing method is surface processing, it is a fast material reduction operation, so a certain high-temperature area will be generated at the tool. If the real-time over-temperature area of ​​the workpiece is larger than the standard processing influence area, it is determined that the over-temperature area has exceeded the range of tool processing influence, that is, the problem of workpiece overheating has occurred. Therefore, by inserting the tool retraction operation and the pause processing operation at the current node of the processing program, the workpiece is cooled to a certain extent, reducing the thermal expansion of the valve workpiece and the machine tool fixture, ensuring the accuracy of the valve workpiece processing positioning, and at the same time improving the processing accuracy of the valve blank.

[0073] Specifically, in step S2, a minimum feed speed is set. When the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is fixed-point processing, the target feed speed is calculated according to the real-time workpiece temperature and the standard processing temperature, and the target feed speed is compared with the minimum feed speed.

[0074] If the target feed rate is greater than or equal to the minimum feed rate, adjusting the current feed rate in the machining program to the calculated target feed rate;

[0075] If the target feed rate is less than the minimum feed rate, the current feed rate in the machining program is adjusted to the minimum feed rate, and the coolant spray rate of the spray device in the real-time valve dedicated machine tool is adjusted;

[0076] Among them, Vf=Vc×(Tb / Ts), Vf is the target feed speed, Vc is the current feed speed in the processing program, Tb is the standard processing temperature, and Ts is the real-time workpiece temperature.

[0077] In this embodiment, the minimum feed speed should be set according to the processing requirements. Generally, the feed speed of the drilling operation in fixed-point processing can be adjusted in a larger range, while the feed speed of tapping can be adjusted in a smaller range or even cannot be adjusted due to the characteristics of the tool.

[0078] Specifically, when the calculated target feed speed is less than the minimum feed speed, the coolant spray rate of the current processing is obtained in the processing program, and the coolant spray rate of the current processing is adjusted according to the target feed speed and the minimum feed speed;

[0079] Among them, Pc'=Pc×[1+(Vm-Vf) / Vm], Pc is the coolant spray rate of the current processing, Pc' is the adjusted coolant spray rate, Vm is the minimum feed speed, and Vf is the target feed speed.

[0080] When the calculated target feed rate is less than the minimum feed rate, the minimum requirement of the processing technology shall prevail, the processing shall be carried out at the minimum feed rate, and the cooling shall be supplemented by adjusting the coolant spray rate;

[0081] Specifically, in step S4, a standard tool head temperature is set. When the real-time workpiece temperature in the thermal imaging image is less than or equal to the standard processing temperature, the real-time tool head temperature of the current processing tool head is obtained through the set temperature sensor, and the real-time tool head temperature is determined according to the standard tool head temperature.

[0082] If the real-time tool head temperature of the current processing tool head is less than or equal to the standard tool head temperature, the processing program is not adjusted;

[0083] If the real-time tool head temperature of the current machining tool head is greater than the standard tool head temperature, a tool retracting operation and a tool head switching operation will be inserted at the current node of the machining program;

[0084] Among them, the tool head switching operation switches the tool head with the same size type as the tool head used by the current node.

[0085] In this embodiment, the standard cutter head temperature needs to be set according to the material of the cutter head and the processing parameters, and can also be compared and selected in combination with the setting method of the standard processing temperature. Usually, the standard cutter head temperature is set higher than the standard processing temperature. The standard cutter head temperature set in this embodiment is 460°C. Please refer to the specific specifications and guidelines provided by the manufacturer for details, which will not be repeated here.

[0086] When the real-time workpiece temperature is less than or equal to the standard processing temperature, the real-time tool head temperature of the current processing tool head is judged to determine whether the current processing is normal, and when the real-time tool head temperature is greater than the standard tool head temperature, the tool retraction operation and tool head switching operation are performed in time, further ensuring the processing accuracy of the valve blank.

[0087] Please continue reading Figures 2 to 4 As shown, this embodiment also provides a valve-specific machine tool for the above method, including a bed 1, an X-axis sliding guide 101, a spindle box 2, a spindle 201, a drive motor 202, a dividing chuck 203, a fixed shaft block 204, a bamboo-hat-type tool magazine 3, a mobile processing component 4, a hydraulic servo turret 401, an electric spindle 402, a spray device 403, and a control center (not shown in the figure), wherein:

[0088] The bed 1 has an X-axis sliding guide rail 101 disposed on one side thereof;

[0089] A spindle box 2 is arranged at one end of the bed 1, and a rotatable spindle 201 is arranged in the spindle box 2. A driving motor 202 for providing rotational power is arranged at one end of the spindle 201, and a dividing chuck 203 for clamping and fixing the valve blank to be processed is arranged at the other end of the spindle 201;

[0090] A conical tool magazine 3 is arranged on one side of the bed 1. The conical tool magazine 3 is a one-piece conical tool magazine 3 for installing a plurality of BBT40 tool handles, taps and U drills;

[0091] A mobile processing assembly 4, which is arranged on the X-axis sliding guide rail 101 and can move horizontally on the X-axis sliding guide rail 101 to perform machining operations on the clamped valve blank;

[0092] The control center is connected to the spindle box 2, the conical tool magazine 3 and the mobile processing assembly 4 respectively, and is used to store the set processing program and control the operation and processing of each component according to the processing program.

[0093] Specifically, the mobile processing assembly 4 includes a hydraulic servo turret 401 equipped with a plurality of turning tools, an electric spindle 402 with a rotational power output, and a spray device 403 disposed on one side of the electric spindle 402 and capable of spraying a cooling liquid.

[0094] Specifically, a shaft-fixing block 204 is disposed inside the spindle box 2 , and the shaft-fixing block 204 is used to wrap the spindle 201 with a circular cross-section; and evenly arranged grooves are disposed on the outer side of the shaft-fixing block 204 .

[0095] In this embodiment, temperature detection is also required with the aid of a thermal imaging device, which can be fixedly set on a machine tool or in a processing environment. Even when the processing method is manually modified, the thermal imaging device can be handheld and mobile.

[0096] In this embodiment, the valve-specific machine tool uses a composite machine tool, which carries multiple types of tools through the conical tool magazine 3 and the hydraulic servo turret 401, and can integrate multiple functions such as turning, drilling, milling, boring, and tapping. With the main spindle 201 and the indexing chuck 203, it can complete the processing of complex parts in one clamping, improve processing efficiency and accuracy, and reduce production costs. There are at least two tools of the same size and model in each type of tool to ensure the normal operation of the processing method, and each tool is connected with a resistive temperature sensor after installation to monitor the tool temperature in real time.

[0097] At the same time, the integrated design of the hydraulic servo turret 401 and the electric spindle 402 in the mobile processing component 4 makes the machine tool more compact. The feed axis can be divided into a Z axis and an X axis respectively. By moving the Z axis, the turret and the tool holder can be quickly switched to process the workpiece, which greatly improves production efficiency.

[0098] Under the premise of ensuring structural strength, the main shaft 201 is circular, and the fixed shaft block 204 wraps the main shaft 201 and is a vertically symmetrical structure. When it expands due to heat, the bed 1 will not expand due to the heat insulation effect of the air, and the main shaft box 2 casting is in a vertically symmetrical expansion state. The superposition of these two effects can also significantly eliminate the precision error caused by the thermal displacement of the machine tool.

[0099] In valve-specific machine tools, the processing program needs to be executed through a control center, and the processing method in this application can use an external host as a carrier to control and modify the control center through the external host.

[0100] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for machining a valve-specific machine tool, characterized in that: include, Step S1, setting a processing program to machine the valve blank; Step S2, using a thermal imaging device to detect the thermal imaging image of the valve blank being machined in real time, extracting the maximum temperature value in the image as the real-time workpiece temperature, and when the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is fixed-point processing, adjusting the current feed speed in the processing program; Step S3, when the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is surface processing, the area of ​​the portion of the thermal imaging image whose temperature value is greater than the standard processing temperature is obtained as the real-time workpiece over-temperature area, and when the real-time workpiece over-temperature area is greater than the standard processing affected area, a tool retraction operation and a processing pause operation are inserted at the current node of the processing program; Step S4, when the real-time workpiece temperature is less than or equal to the standard processing temperature, the real-time tool head temperature of the current processing tool head is obtained, and when the real-time tool head temperature of the current processing tool head is less than or equal to the standard tool head temperature, the processing program is not adjusted until the processing program is completed; In the step S4, if the real-time tool head temperature of the current machining tool head is greater than the standard tool head temperature, a tool retracting operation and a tool head switching operation are inserted into the current node of the machining program; The mobile machining components include an electric spindle, a hydraulic servo turret, and a spray device; In step S2, when the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is fixed-point processing, the target feed speed is calculated according to the real-time workpiece temperature and the standard processing temperature. If the target feed speed is less than the minimum feed speed, the coolant spray rate is adjusted by the following formula: Pc'=Pc×[1+(Vm-Vf) / Vm], where Pc is the coolant spray rate of the current processing, Pc' is the adjusted coolant spray rate, Vm is the minimum feed speed, and Vf is the target feed speed.

2. The processing method of a valve-specific machine tool according to claim 1, characterized in that: In step S2, a standard processing temperature is set, a thermal imaging image of the valve blank is obtained in real time by the thermal imaging device, and the maximum temperature value in the image is extracted as the real-time workpiece temperature, and the real-time workpiece temperature is determined according to the standard processing temperature. If the real-time workpiece temperature is less than or equal to the standard processing temperature, the real-time temperature of the current processing tool head is obtained to determine whether to adjust the processing program; If the real-time workpiece temperature is greater than the standard processing temperature, the current processing mode will be obtained for determination to determine whether the processing program should be adjusted.

3. The processing method of a valve-specific machine tool according to claim 2, characterized in that: When the real-time workpiece temperature is greater than the standard processing temperature, the current processing mode in the processing program will be judged. If the current processing mode is surface processing, the real-time over-temperature area of ​​the workpiece will be obtained for determination to determine whether to adjust the processing program; If the current processing mode is fixed-point processing, the current feed speed in the processing program will be adjusted according to the real-time workpiece temperature and the standard processing temperature; Among them, surface processing includes turning operations, milling operations and boring operations; fixed-point processing includes drilling operations and tapping operations.

4. The processing method of a valve-specific machine tool according to claim 3, characterized in that: In step S3, a standard processing influence area is set. When the real-time workpiece temperature is greater than the standard processing temperature and the current processing mode is surface processing, the area of ​​the portion of the thermal imaging image whose temperature value is greater than the standard processing temperature is obtained as the real-time workpiece over-temperature area, and the real-time workpiece over-temperature area is determined according to the standard processing influence area. If the real-time over-temperature area of ​​the workpiece is less than or equal to the standard processing affected area, the processing program will not be adjusted; If the real-time over-temperature area of ​​the workpiece is larger than the standard processing affected area, a tool retraction operation and a processing pause operation will be inserted at the current node of the processing program.

5. The processing method of a valve-specific machine tool according to claim 3, characterized in that: Compare the target feed rate with the minimum feed rate. If the target feed rate is greater than or equal to the minimum feed rate, adjusting the current feed rate in the machining program to the calculated target feed rate; If the target feed rate is less than the minimum feed rate, the current feed rate in the machining program is adjusted to the minimum feed rate, and the coolant spray rate of the spray device in the real-time valve dedicated machine tool is adjusted; Among them, Vf=Vc×(Tb / Ts), Vf is the target feed speed, Vc is the current feed speed in the processing program, Tb is the standard processing temperature, and Ts is the real-time workpiece temperature.

6. The processing method of a valve-specific machine tool according to claim 2, characterized in that: In step S4, a standard tool head temperature is set. When the real-time workpiece temperature in the thermal imaging image is less than or equal to the standard processing temperature, the real-time tool head temperature of the current processing tool head is obtained through the set temperature sensor, and the real-time tool head temperature is determined according to the standard tool head temperature. If the real-time tool head temperature of the current processing tool head is less than or equal to the standard tool head temperature, the processing program is not adjusted; If the real-time tool head temperature of the current machining tool head is greater than the standard tool head temperature, a tool retracting operation and a tool head switching operation will be inserted at the current node of the machining program; Among them, the tool head switching operation switches the tool head with the same size type as the tool head used by the current node.

7. A valve-specific machine tool, based on the processing method of the valve-specific machine tool according to any one of claims 1 to 6, characterized in that: include, The bed has an X-axis sliding guide on one side; A spindle box is arranged at one end of the bed, a rotatable spindle is arranged in the spindle box, a driving motor for providing rotational power is arranged at one end of the spindle, and a dividing chuck for clamping and fixing the valve blank to be processed is arranged at the other end of the spindle; A conical tool magazine is arranged on one side of the bed, and is a one-piece conical tool magazine for installing a number of BBT40 tool handles, taps and U drills; A mobile processing assembly, which is arranged on the X-axis sliding guide rail and can be horizontally moved on the X-axis sliding guide rail to perform machining operations on the clamped valve blank; The control center is connected to the spindle box, the conical tool magazine and the mobile processing assembly respectively, and is used to store the set processing program and control the operation and processing of each component according to the processing program.

8. The valve-specific machine tool according to claim 7, characterized in that: A shaft-fixing block is arranged inside the spindle box, and the shaft-fixing block is used to wrap the spindle with a circular cross-section; and grooves with uniform arrangement are arranged on the outer side of the shaft-fixing block.

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