A kind of thin-walled deep hole outer thread screw rod processing clamp device and processing method

Abstract

The present application provides a kind of thin-walled deep hole outer thread screw rod processing clamp device and processing method, the clamp device includes clamp assembly, clamp assembly includes first clamping end cap and second clamping end cap, first clamping end cap and second clamping end cap are connected with the both ends of screw rod sample respectively, first clamping end cap includes the cooling pipeline passing through in screw rod sample inside, cooling pipeline is opened with multiple face-to-face screw rod sample inner wall's jet. The clamp device can process the screw rod sample of large stroke thin-walled deep hole, and clamp assembly can be installed on the support table assembly in prior art, can improve adaptability and universality, reduce the production difficulty of screw rod sample, the inner wall of screw rod sample can be temperature controlled by cooling pipeline to ensure cooling efficiency offset the influence of thin-walled outer surface heat production, accurately inhibit thin-walled thermal deformation, to avoid screw rod sample to produce thermal deformation, ensure the consistency of the diameter of shaped product, improve product quality, reduce processing difficulty.

Description

Technical Field

[0001] This application relates to the field of machining technology for thin-walled deep-hole external threaded screws, and in particular to a fixture device and machining method for machining thin-walled deep-hole external threaded screws. Background Technology

[0002] In ordinary lead screw machining, the precision requirements are generally low, and the workpiece is usually a solid cylinder. Morse cores are generally used for clamping to restrict its axial displacement. This clamping feature has a wide range of applications, but only external coolant is sprayed during machining to reduce the heat at the contact point between the grinding wheel and the lead screw.

[0003] In the machining of thin-walled deep-hole external threaded screws, thin-walled deep-hole external threaded screws are generally used to form multi-stage planetary roller screws. They have high precision and are at the forefront of the market. The blanks for machining are generally thin-walled hollow cylindrical shells. Special fixtures are usually designed for use in the machining process, such as clamping end caps at both ends for connection, and Morse centers are used.

[0004] For thin-walled deep-hole external threaded screws with large strokes (i.e., longer length and diameter with smaller pitch, such as a screw diameter of 230mm, a length of 2m, a minimum pitch of only 2mm, and 27 thread starts), the machining difficulty and precision are high, and general machining methods are insufficient to achieve the required accuracy. For large-stroke thin-walled samples, the heat generated by the grinding wheel and screw during grinding, even with coolant spraying onto the outer surface of the screw, can easily affect the thin wall, causing minute thermal deformation and affecting the consistency of the screw's pitch diameter. This effect is acceptable for ordinary screws, but unacceptable for screws with smaller pitches.

[0005] Therefore, it is necessary to design a fixture for machining thin-walled deep-hole external thread screws to solve the above problems. Summary of the Invention

[0006] In view of this, in order to overcome the defects of the prior art, the present invention provides a fixture device and processing method for machining thin-walled deep-hole external thread screws, which effectively solves the problems of uncontrollable heat generation leading to reduced machining accuracy and poor consistency of pitch diameter in the existing machining of large-stroke thin-walled deep-hole external thread screws.

[0007] According to a first aspect of the present invention, a fixture device for machining thin-walled deep-hole external threaded screws is provided for machining screw samples. The fixture device includes a support platform assembly. The screw sample is hollow inside and is disposed on the support platform assembly. The fixture device for machining thin-walled deep-hole external threaded screws includes a fixture assembly. The fixture assembly includes a first clamping end cap and a second clamping end cap. The first clamping end cap and the second clamping end cap are respectively connected to both ends of the screw sample. The first clamping end cap includes a cooling pipe that passes through the interior of the screw sample. The cooling pipe has a plurality of nozzles facing the inner wall of the screw sample.

[0008] Preferably, the support platform assembly includes a support platform body and axial limiting members. The axial limiting members are disposed at both ends of the support platform body. The end faces of the first clamping end cap and the second clamping end cap opposite to the lead screw sample are provided with abutting and tightening portions. The axial limiting members at both ends of the support platform body abut against the abutting and tightening portions of the first clamping end cap and the second clamping end cap, respectively.

[0009] Preferably, the abutting and tightening part is provided with a connecting channel, which passes through the interior of the abutting and tightening part and communicates with the cooling pipe.

[0010] Preferably, a coolant inlet is provided at the end of the connecting channel, and the connecting channel is connected to an external coolant source through the coolant inlet.

[0011] Preferably, the cooling pipe is formed as a cylindrical component, and a plurality of nozzles are evenly distributed on the outer wall of the cylindrical component.

[0012] Preferably, the first clamping end cap and the second clamping end cap are provided with connecting portions at their ends facing the lead screw sample, the connecting portions being disposed inside the lead screw sample, and the first clamping end cap and the second clamping end cap being connected to the lead screw sample through the connecting portions.

[0013] Preferably, the support platform assembly further includes a plurality of support frames, which are movably disposed on the support platform body and connected to the lead screw sample to limit the radial direction of the lead screw sample.

[0014] Preferably, the clamping device further includes a grinding wheel and a temperature detection module. The grinding wheel is used for threading the lead screw sample, and the temperature detection module is disposed on the grinding wheel to detect the temperature of the grinding wheel and the machining area of ​​the lead screw sample.

[0015] According to a second aspect of the present invention, a processing method is provided, wherein the processing method utilizes a fixture device for processing thin-walled deep-hole external threaded screws as described above to process the screw sample, the processing method comprising a clamping method, the clamping method comprising connecting a first clamping end cap to one end of the screw sample such that a cooling pipe passes through the interior of the screw sample; connecting a second clamping end cap to the other end of the screw sample, the second clamping end cap being abutted against the cooling pipe; and placing the screw sample on the support platform assembly, the support platform assembly restricting the axial and radial directions of the screw sample.

[0016] Preferably, the fixture device for machining thin-walled deep-hole external thread screws includes a grinding wheel and a temperature detection module. The temperature detection module includes a temperature sensor, a first flow control valve, a second flow control valve, and a flow meter. The temperature sensor is disposed on the grinding wheel, and the first flow control valve, the second flow control valve, and the flow meter are disposed on an external coolant source connected to the cooling pipe.

[0017] The processing method also includes a temperature control method, which includes setting a low-temperature stage when the temperature fed back by the temperature sensor is less than 20°C, a medium-temperature stage when the temperature fed back by the temperature sensor is greater than or equal to 20°C and less than 35°C, and a high-temperature stage when the temperature fed back by the temperature sensor is greater than or equal to 35°C. When processing parts, if the temperature gradually increases and the process is in the low-temperature stage, the operating mode is low-temperature, the first flow control valve and the second flow control valve are closed, the flow meter is not working, and coolant is not flowing into the cooling pipe. If the temperature continues to increase and the process is in the medium-temperature stage, the first flow control valve opens, the second flow control valve closes, and the flow meter measures the flow rate and provides feedback. If the temperature continues to increase and the process is in the high-temperature stage, both the first and second flow control valves open simultaneously, and the flow rate remains constant. During part processing, if the process has entered the high-temperature stage and the temperature gradually decreases, the process exits the high-temperature stage when the temperature drops to less than or equal to 33°C. If the temperature continues to decrease and the process exits the medium-temperature stage when the temperature drops to less than or equal to 19°C.

[0018] The present invention relates to a fixture device for machining thin-walled deep-hole external threaded screws. Through the cooperation of the fixture assembly and the support platform assembly, this fixture device enables the machining of screw samples with large-stroke thin-walled deep holes. Furthermore, the fixture assembly can be mounted on existing support platform assemblies, improving adaptability and versatility, and reducing the production difficulty of the screw samples. Because the first clamping end cap is provided with a cooling pipe penetrating inside the screw sample, the temperature of the inner wall of the screw sample can be controlled through the cooling pipe to ensure that the cooling efficiency offsets the effect of heat transfer from the thin-walled outer surface to the inner surface, precisely suppressing thin-walled thermal deformation, thereby avoiding thermal deformation of the screw sample, ensuring the consistency of the mean diameter of the formed product, improving product quality, and reducing machining difficulty.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a fixture device for machining thin-walled deep-hole external thread screws according to an embodiment of the present invention is shown.

[0022] Figure 2 A front view of a fixture apparatus for machining thin-walled deep-hole external thread screws according to an embodiment of the present invention is shown;

[0023] Figure 3 A schematic diagram showing the structure of the lead screw sample and the clamp assembly according to an embodiment of the present invention is provided.

[0024] Figure 4 A cross-sectional view showing the engagement of a lead screw sample and a clamping assembly according to an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure of the first clamping end cap according to an embodiment of the present invention is shown.

[0026] Reference numerals in the attached drawings: 1-Screw sample; 201-Support platform body; 2021-First limiting component; 2022-Second limiting component; 2023-Third limiting component; 203-Support frame; 301-First clamping end cap; 302-Second clamping end cap; 303-Cooling pipe; 304-Abutting and tightening part; 305-Connecting channel; 306-Coolant inlet; 307-Nozzle; 308-Connecting part. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] According to a first aspect of the present invention, a fixture device for machining thin-walled deep-hole external threaded screws is provided, such as... Figures 1 to 5As shown, the fixture device for machining thin-walled deep-hole external threaded screws is used for machining the external thread of a screw sample 1. The fixture device includes a support platform assembly and a clamping assembly. The screw sample 1 is disposed on the support platform assembly. Through the cooperation of the support platform assembly and the clamping assembly, the screw sample 1 can be confined within the support platform assembly during machining. The support platform assembly can be a component from the prior art, and its specific structure and the limiting method used can be common structures and methods in prior art screw machining. Those skilled in the art can choose to use the component shown in the figures of this application, or they can choose other components that can achieve the limiting of the screw sample 1; no limitation is made here. Furthermore, the limiting here can be understood as axial and radial limiting in screw machining. Axial can be understood as... Figure 2 The direction from left to right or right to left in the diagram, the radial direction can be understood as... Figure 2 The direction perpendicular to the paper.

[0032] In the following description, reference will be made to Figures 1 to 5 This section describes the detailed structure of the fixture assembly of the fixture device for machining thin-walled deep-hole external thread screws.

[0033] like Figure 1 As shown, in this embodiment, the lead screw sample 1 is a component with a large stroke, thin wall, deep hole, dense pitch, and high machining accuracy requirements. Such a component is highly sensitive to temperature. Therefore, existing machining devices cannot meet the machining requirements of components like the lead screw sample 1 in this embodiment. Cooling the outer surface using only one method cannot stabilize the temperature at the machining site, which will affect the consistency of the formed product. Thus, based on the characteristics of the lead screw sample 1 itself—large stroke, thin wall, and deep hole (large stroke can be understood as a long axial length)—after testing, it has been found that if the temperature of the inner wall of the lead screw sample 1 is also controlled, it can help stabilize the temperature at the machining site, improve machining stability, and thus improve product quality. In addition, since the support platform assembly in the prior art has a stable structure, how to achieve auxiliary cooling of the inner wall while directly cooperating with the support platform assembly in the prior art is the design point of this application, namely, the structural improvement of the fixture assembly.

[0034] Specifically, the clamping assembly includes a first clamping end cap 301 and a second clamping end cap 302. The first clamping end cap 301 and the second clamping end cap 302 are respectively connected to both ends of the lead screw sample 1. The first clamping end cap 301 and the second clamping end cap 302 can jointly position the two ends of the lead screw sample 1 axially, thereby allowing the support platform assembly to limit the lead screw sample 1 through the first clamping end cap 301 and the second clamping end cap 302. The first clamping end cap 301 includes a cooling pipe 303 passing through the inside of the lead screw sample 1. The cooling pipe 303 has multiple nozzles 307 facing the inner wall of the lead screw sample 1. Figure 4and Figure 5 As shown, the cooling pipe 303 is hollow inside for the flow of coolant. The outer wall of the cooling pipe 303 is provided with multiple nozzles 307 that connect to the hollow interior, so that the coolant entering the cooling pipe 303 can be sprayed out from the multiple nozzles 307 and cool the inner wall of the lead screw sample 1.

[0035] Furthermore, to achieve more uniform cooling, one end of the cooling pipe 303 is connected to the middle of the first clamping end cap 301. Since the lead screw sample 1 can be formed as a cylindrical component, the cooling pipe 303 is located in the middle of the interior of the lead screw sample 1. The first end of the cooling pipe 303 is disposed on the first clamping end cap 301, and the second end of the cooling pipe 303 can be connected to the second clamping end cap 302 to realize the flow of coolant.

[0036] Furthermore, such as Figure 4 and Figure 5 As shown, since the contact position between the lead screw sample 1 and the grinding wheel will change during the processing, in order to cool down in a targeted manner, multiple nozzles 307 are evenly provided on the outer wall of the cooling pipe 303 from the first end to the second end.

[0037] This fixture device for machining thin-walled deep-hole external threaded screws, through the cooperation of the fixture assembly and the support table assembly, enables the machining of screw samples 1 with large stroke thin-walled deep holes. Furthermore, the fixture assembly can be mounted on existing support table assemblies, improving adaptability and versatility, and reducing the production difficulty of the screw sample 1. Because the first clamping end cap 301 is equipped with a cooling pipe 303 penetrating inside the screw sample 1, the temperature of the inner wall of the screw sample 1 can be controlled through the cooling pipe 303. This ensures that the cooling efficiency offsets the effect of heat transfer from the thin-walled outer surface to the inner surface, precisely suppressing thin-walled thermal deformation, thereby preventing thermal deformation of the screw sample 1, ensuring the consistency of the mean diameter of the formed product, improving product quality, and reducing machining difficulty.

[0038] Preferably, such as Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the support platform assembly may include a support platform body 201 and axial limiting members. The axial limiting members are disposed at both ends of the support platform body 201. The end faces of the first clamping end cap 301 and the second clamping end cap 302 opposite to the lead screw sample 1 are provided with abutting and tightening portions 304. The axial limiting members at both ends of the support platform body 201 abut against the abutting and tightening portions 304 of the first clamping end cap 301 and the second clamping end cap 302, respectively.

[0039] Specifically, the axial limiting components may include a first limiting component 2021, a second limiting component 2022, and a third limiting component 2023. The first limiting component 2021 may be, for example, a hydrostatic headstock as used in the prior art; the second limiting component 2022 may be, for example, a hydrostatic tailstock as used in the prior art; and the third limiting component 2023 may be, for example, a Morse head as used in the prior art. The hydrostatic headstock and the hydrostatic tailstock can be adjusted in position on the support platform body 201 according to the length of the lead screw sample 1. Both the hydrostatic headstock and the hydrostatic tailstock have a Morse head at one end facing the lead screw sample 1. The Morse head can abut against the first clamping end cap 301 and the second clamping end cap 302 to clamp the lead screw sample 1.

[0040] Furthermore, the end faces of the first clamping end cap 301 and the second clamping end cap 302 opposite to the lead screw sample 1 are provided with abutting and tightening parts 304. The end of the abutting and tightening parts 304 facing the Morse tip is provided with a clamping groove that matches the shape of the Morse tip. The Morse tip can clamp the lead screw sample 1 through the clamping groove.

[0041] Preferably, such as Figure 1 , Figure 2 and Figure 5 As shown in the embodiment, the first clamping end cap 301 and the second clamping end cap 302 are provided with connecting portions 308 at their ends facing the lead screw sample 1. The connecting portions 308 are disposed inside the lead screw sample 1, and the first clamping end cap 301 and the second clamping end cap 302 are connected to the lead screw sample 1 through the connecting portions 308. The inner walls of both ends of the lead screw sample 1 in the axial direction may be provided with internal threads, and the outer wall of the connecting portion 308 may be provided with external threads. The two are detachably connected by the threads.

[0042] Preferably, such as Figure 4 As shown, in this embodiment, the abutting and tightening part 304 is provided with a communicating channel 305, which passes through the interior of the abutting and tightening part 304 and communicates with the cooling pipe 303. Specifically, the communicating channel 305 can be formed as an L-shaped pipe, with the two ends of the L-shaped pipe being the coolant inlet 306 and the end communicating with the cooling pipe 303, respectively. Coolant can enter through the coolant inlet 306 and flow into the cooling pipe 303.

[0043] Preferably, such as Figure 4 As shown, in this embodiment, a coolant inlet 306 is provided at the end of the connecting channel 305, and the connecting channel 305 is connected to an external coolant source through the coolant inlet 306. Additionally, the first flow control valve, the second flow control valve, and the flow meter mentioned in the following temperature control method can be installed on the pipe connecting the external coolant source to the coolant inlet 306.

[0044] Preferably, such as Figure 4 and Figure 5 As shown, in this embodiment, to achieve a better spraying effect, the cooling pipe 303 can be formed as a cylindrical component, with multiple nozzles 307 evenly distributed on the outer wall of the cylindrical component. In this embodiment, a total of 432 nozzles 307 with a diameter of 2 mm are provided.

[0045] Preferably, such as Figure 1 and Figure 2 As shown, in this embodiment, the support platform assembly may further include multiple support frames 203, which are movably disposed on the support platform body 201. The multiple support frames 203 are connected to the lead screw sample 1 to limit the radial direction of the lead screw sample 1. The support frames 203 can achieve radial limitation of the lead screw sample 1. Since the lead screw sample 1 has a large stroke, multiple movable support frames 203 are provided. The movable arrangement can be achieved, for example, through the cooperation of a slide rail and a slider. The end face of the support frame 203 facing the lead screw sample 1 is formed into an approximately C-shaped structure to accommodate the cylindrical lead screw sample 1. Similarly, the support frame 203 can also be a component from the prior art. The remaining structures and connection methods of the support frame 203 are known to those skilled in the art and will not be described in detail here.

[0046] Preferably, in this embodiment, the clamping device further includes a grinding wheel and a temperature detection module (not shown). The grinding wheel is used for threading the lead screw sample 1, and the temperature detection module is disposed on the grinding wheel to detect the temperature at the machining point between the grinding wheel and the lead screw sample 1. The temperature detection module may include, for example, a temperature sensor. By placing a temperature sensor on the outside or inside of the grinding wheel, the operator can monitor the temperature of the contact surface between the grinding wheel and the lead screw sample 1, and choose whether to spray coolant onto the inner wall of the lead screw sample 1 through the cooling pipe 303 to cool it down, or select the spray volume based on the temperature level. The grinding wheel and the temperature detection module may also be components from the prior art.

[0047] The method of using the fixture device for machining thin-walled deep-hole external threaded screws is as follows: First, clamp the screw sample 1. Connect the first clamping end cap 301 to one end of the screw sample 1 using a threaded connection, so that the cooling pipe 303 passes through the interior of the screw sample 1. At this time, the cooling pipe 303 is located in the middle of the interior of the screw sample 1, which is the optimal position. Then, connect the second clamping end cap 302 to the other end of the screw sample 1. The second clamping end cap 302 aligns with the cooling pipe 303, so that the connecting channel 305 inside the second clamping end cap 302 can communicate with the hollow cooling pipe 303 for the passage of coolant. Finally, place the screw sample 1 on the support platform assembly, which restricts the axial and radial directions of the screw sample 1. After clamping the lead screw sample 1, the device is started so that the grinding wheel performs a threading operation on the lead screw sample 1. During the threading process, the temperature of the contact surface between the grinding wheel and the lead screw sample 1 is monitored by the temperature detection module. Based on the temperature, it is selected whether to spray coolant onto the cooling pipe 303.

[0048] This fixture device for machining thin-walled deep-hole external threaded screws, through the cooperation of the fixture assembly and the support table assembly, enables the machining of screw samples with large-stroke thin-walled deep holes. Furthermore, the fixture assembly can be mounted on existing support table assemblies, improving adaptability and versatility, and reducing the production difficulty of the screw samples. Because the first clamping end cap is equipped with a cooling pipe penetrating inside the screw sample, the temperature of the inner wall of the screw sample can be controlled through the cooling pipe. This ensures that the cooling efficiency offsets the effect of heat transfer from the thin-walled outer surface to the inner surface, precisely suppressing thin-walled thermal deformation, thereby preventing thermal deformation of the screw sample, ensuring the consistency of the mean diameter of the formed product, improving product quality, and reducing machining difficulty.

[0049] Furthermore, according to a second aspect of the present invention, a processing method is provided, which uses a fixture device for processing thin-walled deep-hole external threaded screws as described above to process a screw sample 1, the processing method including a clamping method and a temperature control method.

[0050] Specifically, the clamping methods include:

[0051] The first step is to connect the first clamping end cap 301 to one end of the lead screw sample 1. A threaded connection can be used so that the cooling pipe 303 passes through the interior of the lead screw sample 1. At this time, the cooling pipe 303 is located in the middle of the interior of the lead screw sample 1, which is the best position.

[0052] The second step is to connect the second clamping end cap 302 to the other end of the lead screw sample 1. The second clamping end cap 302 is connected to the cooling pipe 303, so that the connecting channel 305 inside the second clamping end cap 302 can be connected to the hollow cooling pipe 303 for the passage of coolant.

[0053] Step 3: Place the screw rod sample 1 on the support platform assembly to restrict the axial and radial directions of the screw rod sample 1 through the support platform assembly.

[0054] Preferably, in order to achieve temperature control, the fixture device for machining the thin-walled deep-hole external thread screw rod may further include a grinding wheel and a temperature detection module. The temperature detection module may include a temperature sensor, a first flow control valve, a second flow control valve, and a flow meter. The temperature sensor is arranged on the grinding wheel, and the first flow control valve, the second flow control valve, and the flow meter are arranged on an external coolant source connected to the cooling pipeline 303. Specifically, it may be arranged on the pipeline connecting the external coolant source and the communication channel 305. The first flow control valve may be, for example, a basic valve, and the second flow control valve may be, for example, a booster valve. The first flow control valve, the second flow control valve, and the flow meter are all components in the prior art, and their structures, principles, and connection methods are known to those skilled in the art, and will not be elaborated here.

[0055] The temperature control method includes:

[0056] Step 1: Set that the temperature fed back by the temperature sensor being less than 20°C is the low-temperature stage, the temperature fed back by the temperature sensor being greater than or equal to 20°C and less than 35°C is the medium-temperature stage, and the temperature fed back by the temperature sensor being greater than or equal to 35°C is the high-temperature stage;

[0057] Step 2: When machining the part, as the temperature gradually increases and is in the low-temperature stage, the working mode is the low-temperature stage, the first flow control valve and the second flow control valve are closed, the flow meter does not work, and no coolant is introduced into the cooling pipeline 303, and the flow rate is zero;

[0058] Step 3: As the temperature continues to increase and is in the medium-temperature stage, the first flow control valve is opened, the second flow control valve is closed, and the flow meter measures the flow rate at this time and gives feedback. The flow rate at this time is linearly adjusted according to the formula: G = Kp(T - 20) (0 < G ≤ 1.5 L / min), where G is the flow rate, Kp is the proportionality coefficient, which needs to be calibrated, and Kp varies with different machine tools and different specifications of the screw rod sample 1, and needs to be measured according to experiments.

[0059] Step 4: As the temperature continues to increase and is in the high-temperature stage, the first flow control valve and the second flow control valve are opened simultaneously, and the flow rate is constant at this time; in addition, when entering the high-temperature stage, the second flow control valve opens gradually within two seconds according to a ramp function to avoid the water hammer effect.

[0060] Step 5: During the machining of the part, if it has entered the high-temperature stage and the temperature gradually decreases, when the temperature drops to less than or equal to 33°C, exit the high-temperature stage;

[0061] Step six: The temperature continues to decrease. Once the temperature drops to less than or equal to 19°C, the intermediate temperature stage is exited. In steps five and six, a temperature hysteresis is specifically designed to achieve anti-vibration and ensure stability during processing.

[0062] This processing method can effectively utilize the above-mentioned fixture device for machining thin-walled deep-hole external thread screws, resulting in high machining accuracy, good consistency, and stable machining of screw sample 1, while reducing machining difficulty.

[0063] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A fixture device for machining thin-walled deep-hole external threaded screws, used for machining screw samples, the fixture device comprising a support platform assembly, the screw sample being hollow internally, the screw sample being disposed on the support platform assembly, characterized in that, The fixture device for machining thin-walled deep-hole external threaded screws includes a fixture assembly, which includes a first clamping end cap and a second clamping end cap. The first clamping end cap and the second clamping end cap are respectively connected to both ends of the screw sample. The first clamping end cap includes a cooling pipe that passes through the inside of the screw sample. The cooling pipe has multiple nozzles facing the inner wall of the screw sample. The support platform assembly includes a support platform body and axial limiting members. The axial limiting members are disposed at both ends of the support platform body. The end faces of the first clamping end cap and the second clamping end cap opposite to the lead screw sample are provided with abutting and tightening portions. The axial limiting members at both ends of the support platform body abut against the abutting and tightening portions of the first clamping end cap and the second clamping end cap, respectively. The abutting and tightening part is provided with a connecting channel, which passes through the interior of the abutting and tightening part and connects with the cooling pipe; The end of the connecting channel is provided with a coolant inlet, and the connecting channel is connected to an external coolant source through the coolant inlet; The cooling pipe is formed as a cylindrical component, and a plurality of nozzles are evenly distributed on the outer wall of the cylindrical component; The first clamping end cap and the second clamping end cap are provided with connecting portions at their ends facing the lead screw sample. The connecting portions are located inside the lead screw sample, and the first clamping end cap and the second clamping end cap are connected to the lead screw sample through the connecting portions. The support platform assembly further includes multiple support frames, which are movably disposed on the support platform body and connected to the lead screw sample to limit the radial direction of the lead screw sample; The clamping device further includes a grinding wheel and a temperature detection module. The grinding wheel is used for threading the lead screw sample, and the temperature detection module is set on the grinding wheel to detect the temperature of the grinding wheel and the machining area of ​​the lead screw sample.

2. A processing method, characterized in that, The machining method utilizes the fixture device for machining thin-walled deep-hole external thread screws as described in claim 1 to machine the screw sample, the machining method including a clamping method, the clamping method including: Connect the first clamping end cap to one end of the lead screw sample, so that the cooling pipe passes through the interior of the lead screw sample; Connect the second clamping end cap to the other end of the lead screw sample, and connect the second clamping end cap to the cooling pipe; The lead screw sample is placed on the support platform assembly, which restricts the axial and radial directions of the lead screw sample.

3. The processing method according to claim 2, characterized in that, The fixture device for machining thin-walled deep-hole external thread screws includes a grinding wheel and a temperature detection module. The temperature detection module includes a temperature sensor, a first flow control valve, a second flow control valve, and a flow meter. The temperature sensor is disposed on the grinding wheel, and the first flow control valve, the second flow control valve, and the flow meter are disposed on an external coolant source connected to the cooling pipe. The processing method further includes a temperature control method, the temperature control method comprising: The temperature fed back by the temperature sensor is defined as the low temperature stage when it is less than 20°C, the medium temperature stage when it is greater than or equal to 20°C and less than 35°C, and the high temperature stage when it is greater than or equal to 35°C. When processing parts, the temperature gradually increases, and when it is in a low-temperature stage, the working mode is low-temperature stage, the first flow control valve and the second flow control valve are closed, the flow meter does not work, and the cooling pipe does not flow with coolant; As the temperature continues to increase and remains in the intermediate temperature range, the first flow control valve opens, the second flow control valve closes, and the flow meter measures the flow rate at this time and provides feedback. As the temperature continues to rise and remains at a high temperature, both the first and second flow control valves open simultaneously, resulting in a constant flow rate. If the part is being processed and has entered a high-temperature stage, and the temperature is gradually decreasing, the high-temperature stage shall be exited when the temperature drops to less than or equal to 33°C. The temperature continues to drop, and once it falls to 19°C or less, it exits the intermediate temperature stage.

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