Processing method of hollow thin-walled skeleton parts with multi-angle composite surface structure

Abstract

A method for processing hollow thin-walled skeleton parts with multi-angle composite surface structure belongs to the field of titanium alloy processing technology. It is characterized by using a three-axis CNC linear machine tool equipped with special tooling to process skeleton parts with special structural characteristics, which greatly improves production efficiency while greatly reducing production costs and improving the market economic benefits of such products. The specific process flow is: 1) rough milling the reference surface after surface treatment of the cast titanium alloy skeleton blank; 2) aligning and marking the central symmetry line of the skeleton of the workpiece to be processed and the welding position of the skeleton clamp; 3) compacting the workpiece to be processed on the special tooling platform; 4) fine milling the skeleton clamp; 5) processing: 6) drilling the bottom hole; 7) tapping the through hole; 8) grinding with the counterweight block; 9) lettering, inspection, packaging, and transportation.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium alloy processing, and in particular to a mechanical processing method of a hollow thin-wall characteristic skeleton-type titanium alloy part with a spatial multi-angle composite surface structure. Background Art

[0002] TC6 titanium alloy is a kind of aerospace material with excellent performance, but it is also a difficult-to-cut material. TC6 titanium alloy is a martensitic α+β two-phase heat-resistant titanium alloy. It is the most widely used Ti-Al-Mo-Cr-Fe-Si titanium alloy. Its nominal composition is Ti-6Al1.5Mo-2.5Cr-0.5Fe-0.3Si. Its operating temperature can reach 450℃ and it is widely used in the aviation field. However, there are the following difficulties in the machining of TC6 titanium alloy:

[0003] a. Low thermal conductivity, only 8W2(m2℃) -1 The heat generated during machining is not easy to dissipate, and the cutting temperature is high during cutting, which aggravates the wear of the tool.

[0004] b. High chemical activity and strong affinity. When the cutting temperature is high, the cutting and cut surfaces bite with the tool material to produce serious tool sticking phenomenon, causing severe adhesion and wear of the tool; chemical reaction occurs at high temperature to generate TiO 2 , TiN, TiH and other hard and brittle layers, coupled with the hardening phenomenon caused by plastic deformation during the cutting process, are very easy to wear the tool. During the cutting process, there is a lot of friction between the tool and the workpiece, and between the tool and the chip, which increases the cutting force, cutting heat and workpiece deformation, causing tool wear and affecting the processing quality of the processed surface.

[0005] c. The low elastic modulus causes a large rebound after deformation under load, causing the titanium alloy parts to deviate from the tool during machining.

[0006] A certain type of TC6 titanium alloy skeleton is a hollow thin-walled structural part with a multi-angle composite surface structure. It has high dimensional accuracy requirements and is difficult to process. Although it can achieve its high-precision dimensional and shape requirements, the procurement cost of the five-axis linkage machining center is extremely high, often 5 to 10 times that of the three-axis linkage machining center. In addition, the programming of the five-axis linkage machining center is difficult, and the technical ability of the programmer and operator is strictly required, and the equipment maintenance cost is high. In addition, the main body of the five-axis linkage machining center adopts an electric spindle system, which has the characteristics of high speed, high precision, and low cutting volume. Although it can process parts with spatial surface polyhedral structure, due to its flexible actuator structure design with high degree of freedom, it is difficult for the five-axis linkage machining center to apply a large radial cutting feed and axial cutting depth when processing high-hardness titanium alloy materials. It can only make up for this deficiency with a small milling reduction and multiple reciprocating cycles. For the production of parts without a certain number of batches, its economic benefits are not high and it is difficult to apply to most mechanical processing manufacturers. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a method for processing hollow thin-walled characteristic skeleton parts with a multi-angle composite surface structure. The method can realize the processing of skeleton parts with such characteristics on a three-axis linkage machining center, thereby greatly improving the production efficiency and the market economic benefits of such products.

[0008] The technical solution of the present invention is as follows:

[0009] A method for processing hollow thin-walled characteristic skeleton parts with a multi-angle composite surface structure is characterized by using a three-axis CNC linear machine tool equipped with special tooling, and the specific process is as follows:

[0010] 1) Surface treatment (grinding, deburring, descaling, and surface sandblasting) is performed on the cast titanium alloy skeleton blank, and then rough milling of reference surface A165, reference surface A267, reference surface B166, and reference surface B268 is performed by profile milling, leaving a fine milling allowance of 2mm, and the flatness of each surface is ±0.2mm;

[0011] 2) Align and mark the central symmetry line of the workpiece skeleton to be processed and the welding position of the skeleton clamp according to the drawing;

[0012] 3) Clean the workpiece frame and the frame clamp to be welded with acetone; level the symmetrical center line, align according to the clamp position line, and fix by spot welding; use a pressing plate to press the workpiece to be processed on the special tooling platform, complete the welds at all places, and remove the pressing plate after the workpiece is completely cooled;

[0013] 4) Position according to the processing reference and drill the positioning pin hole; find the central symmetry line, position according to the processing reference, and fine-mill the skeleton chuck to ensure the dimensional accuracy is ±0.1mm and the symmetry is 0.1mm;

[0014] 5) Processing:

[0015] a. Install the frame on the special tooling, with the reference surface A165 facing upwards, and fix the frame clamp;

[0016] b. Mill the internal hollow structure according to the size, fill the non-processed hollow parts with shock-absorbing rubber, keep the size of the drawing, and the surface roughness is less than 6.3; mill the skeleton contour according to the size by contour milling, keep the size of the drawing; mill the surface by surface milling according to the reference surface A165, keep the size of the drawing, and keep the flatness 0.1mm and the symmetry 0.1mm;

[0017] c. Replace the angle fixing plate to position the tooling reference to the reference surface A267, and use the profile milling method to fine-mill the profile surface, maintaining the drawing size, flatness 0.1mm and symmetry 0.1mm

[0018] d. Turn over and install the skeleton on the special tooling. Fix the skeleton clamp according to the mark on the clamping base plate 1, with the reference surface B166 facing upwards, and align. Mill the surface by contour milling according to the reference surface B166, keep the drawing size, flatness 0.1mm and symmetry 0.1mm;

[0019] e. Replace the angle fixing plate, position the tooling reference to the reference surface B268, and use the profile milling method to fine-mill the profile surface, maintain the drawing size, flatness 0.1mm and symmetry 0.1mm;

[0020] 6) Align the symmetrical center line; drill the bottom hole according to the size and keep the size of the drawing;

[0021] 7) Tapping through holes;

[0022] 8) Grinding with the counterweight requires interference fit;

[0023] 9) Engraving, inspection, packaging and transportation.

[0024] The part has one or more of the following characteristics:

[0025] ① The angles of adjacent feature space surfaces of the parts are between 5° and 10°, and the sum of the cumulative angles of adjacent feature space surfaces in the same quadrant plane of the machine tool basic coordinate system is not greater than 15°;

[0026] ②The minimum wall thickness of the parts is between 1 and 2 mm;

[0027] ③ The part has a closed-loop contour depression, or a part that has a negative angle during machining and cannot be directly cleaned;

[0028] ④The surface roughness is required to reach Ra≤3.2μm;

[0029] ⑤ The sum of the projection areas of the hollow structures of the parts accounts for 50% to 80% of the total surface area.

[0030] The parts are made of TC6 titanium alloy.

[0031] As the preferred technical solution:

[0032] The special tooling is composed of a clamping base plate 1, a fixed base plate 2, an angle fixing plate 3, a rotating shaft 4, and a rotating shaft fixing seat 5, wherein:

[0033] The clamping base plate 1 is located on the fixed base plate 2, and the clamping base plate 1 is provided with a positioning pin hole 11 for the workpiece to be processed; the side wall of the clamping base plate 1 is provided with a clamping base plate fixing pin hole 33, and the side wall of the fixed base plate 2 is provided with a fixed base plate positioning pin hole 34, and the angle fixing plate 3 is fixed between the clamping base plate fixing pin hole 33 and the fixed base plate positioning pin hole 34 by a positioning pin 31;

[0034] A through hole is provided on the side wall of the rotating shaft fixing seat 5 perpendicular to the installation plane. The rotating shaft fixing seat 5 is composed of an upper fixing seat 51 and a lower fixing seat 52. The upper fixing seat 51 is arranged on the lower surface of the clamping base plate 1, and the lower fixing seat 52 is arranged on the upper surface of the fixed base plate 2; an end is provided on one side of the rotating shaft 4, and an installation hole 42 for installing the anti-slip plug rod 41 is provided on the other side.

[0035] The rotating axis fixing seat 5 is installed at the center position of the machine tool clamping platform. The side edges of the rotating axis fixing seat 5 are parallel to the clamping base plate 1, and the parallelism is less than 10μm; and the lengths of the two sets of mutually perpendicular edges from the parallel edges of the clamping platform are equal, and the error range is less than 1mm.

[0036] The three-axis CNC linear machine tool is equipped with a constant temperature chiller and a plate heat exchanger, which are used to low-temperature cool the cutting coolant of the three-axis CNC linear machine tool to ensure that the temperature of the cutting fluid is constant at 10±0.5°C.

[0037] A booster device is installed at the cutting fluid nozzle of the three-axis CNC linear machine tool to allow the cutting fluid to enter the tool cutting position in the form of a high-pressure jet.

[0038] The beneficial effects of the present invention are:

[0039] 1. The present invention fundamentally solves the problem that ordinary three-axis CNC linear machine tools are difficult to process spatial multi-dimensional surface structural parts through the design of special tooling. And through process design and tooling positioning, the reference coordinates of the parts are transferred to the customized tooling in the CAM software, and the whole part through-sequence processing can be completed efficiently through one-time reference positioning, solving the problem of normalization of processing references.

[0040] 2. Due to the equipment structure, the five-axis machine tool has insufficient spindle cutting depth when processing the parts described in the present invention. The three-axis machine tool used in the present invention adopts a gravity cutting spindle, which has the characteristics of low speed and torque, and can realize a processing method with large cutting depth and large cutting feed. Although it is difficult to realize the one-time forming processing of spatial polyhedrons, by setting relevant processing parameters, the processing time under the same process can be effectively reduced, and the programming difficulty and the number of program codes can be reduced.

[0041] 3. The scheme described in the present invention can ensure the dimensional accuracy of the same parts processed by five-axis CNC machine tools, greatly reducing the procurement cost of machine tools and their supporting tools. In addition, from the perspective of labor costs and working hours, the economy of three-axis CNC linear machine tools is also unmatched by five-axis CNC machine tools.

[0042] 4. The present invention solves the problem that when the original three-axis machine tool processes similar products, it often needs multiple positioning and repeated adjustments, and the cumulative errors caused by multiple adjustments make it difficult to ensure the overall accuracy.

[0043] 5. The present invention solves the problem that when a part has a sunken structure at the same time, the traditional processing method will produce a processing internal angle and the tool cannot enter the position to be processed.

[0044] 6. The method described in the present invention is particularly suitable for hollow thin-walled TC6 titanium alloy parts with a spatial polyhedron structure. It can solve the processing difficulties caused by TC6 titanium alloy and the hollow thin-walled structure with a spatial polyhedron structure. While greatly improving production efficiency, it greatly reduces production costs and improves the market economic benefits of such products. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Schematic diagram of the workpiece structure to be processed.

[0046] Figure 2 Schematic diagram of the overall structure of special tooling.

[0047] Figure 3 Special tooling three-dimensional assembly Figure 1 .

[0048] Figure 4 Special tooling three-dimensional assembly Figure 2 .

[0049] Figure 5 Schematic diagram of tooling adjustment.

[0050] Figure 6 Schematic diagram of the structure of a three-axis CNC linear machine tool equipped with special tooling.

[0051] Figure 7 Schematic diagram of the connection between the three-axis CNC linear machine tool, plate heat exchanger and constant temperature water cooler.

[0052] : 1. clamping base plate, 2. fixed base plate, 3. angle fixing plate, 4. rotating axis, 5. rotating axis fixing seat, 6. workpiece to be processed, 7. special tooling, 8. three-axis CNC linear machine tool, 11. positioning pin hole of workpiece to be processed, 31. positioning pin, 32. fixing pin hole of angle fixing plate, 33. fixing pin hole of clamping base plate, 34. positioning pin hole of fixed base plate, 41. anti-slip plug rod, 42. mounting hole, 51. upper fixing seat, 52. lower fixing seat, 61. workpiece fixing pin hole, 62. skeleton positioning chuck, 63. skeleton chuck, 64. skeleton center line, 65. reference plane A1, 66. reference plane B1, 67. reference plane A2, 68. reference plane B2, 69. machining surface, 100. three-axis CNC linear machine tool, 101. plate heat exchanger, 102. constant temperature water chiller. DETAILED DESCRIPTION

[0053] Example

[0054] like Figure 1 The figure is a schematic diagram of the structure of the hollow thin-walled characteristic skeleton-type parts with a multi-angle composite surface structure according to the present invention, and the material is TC6 titanium alloy.

[0055] like Figures 2 to 5 As shown, it is a schematic diagram of the overall structure of the special tooling of the present invention, the special tooling is composed of a clamping base plate 1, a fixed base plate 2, an angle fixing plate 3, a rotating shaft 4, and a rotating shaft fixing seat 5, wherein:

[0056] The clamping base plate 1 is located on the fixed base plate 2, and the clamping base plate 1 is provided with a positioning pin hole 11 for the workpiece to be processed; the side wall of the clamping base plate 1 is provided with a clamping base plate fixing pin hole 33, and the side wall of the fixed base plate 2 is provided with a fixed base plate positioning pin hole 34, and the angle fixing plate 3 is fixed between the clamping base plate fixing pin hole 33 and the fixed base plate positioning pin hole 34 by a positioning pin 31;

[0057] A through hole is provided on the side wall of the rotating shaft fixing seat 5 perpendicular to the installation plane. The rotating shaft fixing seat 5 is composed of an upper fixing seat 51 and a lower fixing seat 52. The upper fixing seat 51 is arranged on the lower surface of the clamping base plate 1, and the lower fixing seat 52 is arranged on the upper surface of the fixed base plate 2; an end is provided on one side of the rotating shaft 4, and a mounting hole 42 for installing the anti-slip plug rod 41 is provided on the other side. The rotating shaft 4 passes through the through hole of the rotating shaft fixing seat 5 and is fixed with the anti-slip plug rod 41.

[0058] The rotating axis fixing seat 5 is installed at the center position of the machine tool clamping platform. The side edges of the rotating axis fixing seat 5 are parallel to the clamping base plate 1, and the parallelism is less than 10μm; and the lengths of the two sets of mutually perpendicular edges from the parallel edges of the clamping platform are equal, and the error range is less than 1mm.

[0059] like Figure 7 As shown, the present invention cools the cutting coolant of the three-axis CNC linear machine tool 100 at low temperature by adding a constant temperature chiller 102 in cooperation with a plate heat exchanger 101, ensuring that the temperature of the cutting fluid is constant at 10±0.5°C. In addition, a booster device is added to the cutting fluid nozzle, so that the machining cutting fluid enters the tool cutting position in the form of a high-pressure jet, and the machining debris is removed while ensuring cooling, thereby avoiding tool wear caused by high machining temperature and tool sticking during machining.

[0060] The angle of adjacent feature space surfaces of a certain model skeleton structure is between 5° and 10°, the sum of the cumulative adjacent feature space surface angles in the same quadrant plane of the machine tool basic coordinate system is not greater than 15°, and the minimum wall thickness is between 1 and 2 mm. Its characteristic structure has a closed-loop contour depression. A certain model skeleton structure is machined using a three-axis CNC linear machine tool equipped with special tooling. The specific process is as follows:

[0061] 1) The cast titanium alloy skeleton blank is grinded by benchwork, deburred, descaled, and sandblasted. Then, the reference surface A1 65, reference surface A2 67, reference surface B1 66, and reference surface B2 68 are roughly milled by profile milling, leaving a fine milling allowance of 2mm, and the flatness of each surface is ±0.2mm;

[0062] 2) Align and mark the central symmetry line of the workpiece skeleton to be processed and the welding position of the skeleton clamp according to the drawing;

[0063] 3) Clean the workpiece frame and the frame clamp to be welded with acetone; level the symmetrical center line, align according to the clamp position line, and fix by spot welding; use a pressing plate to press the workpiece to be processed on the special tooling platform to reduce welding deformation, complete the welding of all welds, and remove the pressing plate after the workpiece is completely cooled;

[0064] 4) Position according to the processing reference, drill the positioning pin hole, require the positioning pin hole to be accurate, and coordinate with the positioning pin hole of the tooling to continue to the subsequent process; find the center symmetry line, position according to the processing reference, and fine mill the skeleton chuck to ensure the dimensional accuracy of ±0.1mm and the symmetry of 0.1mm;

[0065] 5) Processing:

[0066] a) Install the skeleton on the special tooling with the reference surface A1 65 facing upwards, fix the skeleton clamp head according to the mark on the tooling clamping base plate, and locate and align it with the center coordinates of the tooling;

[0067] b) Mill the internal hollow structure according to the size, fill the non-processed hollow parts with shock-absorbing rubber to reduce vibration, keep the drawing size, and the surface roughness is less than 6.3; mill the skeleton contour according to the size by contour milling, keep the drawing size; mill the surface by shape milling according to the reference surface A1 65, keep the drawing size, and keep the flatness 0.1mm and symmetry 0.1mm;

[0068] c) Replace the angle fixing plate to position the tooling reference to the reference surface A2 67, and use the profile milling method to fine-mill the profile surface, maintaining the drawing size, flatness 0.1mm and symmetry 0.1mm

[0069] d) Turn over and install the skeleton on the special tooling, fix the skeleton clamp according to the mark on the clamping base plate, with the reference surface B1 66 facing upwards, and align; mill the surface by contour milling according to the reference surface B1 66, keep the drawing size, flatness 0.1mm and symmetry 0.1mm;

[0070] e) Replace the angle fixing plate, position the tooling reference to the reference surface B2 68, and fine-mill the profile surface by profile milling, maintaining the drawing size, flatness 0.1mm and symmetry 0.1mm;

[0071] 6) Align the symmetrical center line; drill the bottom hole according to the size and keep the size of the drawing;

[0072] 7) Tapping through holes;

[0073] 8) Grinding with the counterweight requires interference fit;

[0074] 9) Engraving, inspection, packaging and transportation.

[0075] Comparative Example

[0076] Table 1 shows the processing Figure 1 The figure shows a comparison of machining parameters between a three-axis machine tool and a five-axis machine tool when machining a TC6 titanium alloy skeleton structure. All machine tools use the same type of alloy material cutting tools.

[0077] Table 1 Machining parameters of three-axis machine tools and five-axis machine tools

[0078]

[0079] Through horizontal comparison, it can be seen that when processing a certain type of TC6 titanium alloy skeleton, compared with a five-axis CNC machine tool, the three-axis machine tool used in the present invention with special tooling can improve the production efficiency by more than 3 times.

[0080] Matters not covered by the present invention are known technologies.

[0081] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A processing method for hollow thin-walled characteristic skeleton parts with multi-angle composite surface structure, It is characterized in that The three-axis CNC linear machine tool equipped with special tooling is used for processing. The specific process is as follows: 1) Surface treatment is performed on the cast titanium alloy skeleton blank, and then rough milling of the reference surface A1 (65), the reference surface A2 (67), the reference surface B1 (66), and the reference surface B2 (68) is performed by the profile milling method, leaving a finishing milling allowance of 2 mm, and the flatness of each surface is within ±0.2 mm; 2) Align and mark the central symmetry line of the workpiece skeleton to be processed and the welding position of the skeleton clamp according to the drawing; 3) Clean the workpiece frame and the frame clamp to be welded with acetone; level the symmetrical center line, align according to the clamp position line, and fix by spot welding; use a pressing plate to press the workpiece to be processed on the special tooling platform, complete the welds at all places, and remove the pressing plate after the workpiece is completely cooled; 4) Position according to the processing reference and drill the positioning pin hole; find the central symmetry line, position according to the processing reference, and fine-mill the skeleton chuck to ensure the dimensional accuracy is ±0.1mm and the symmetry is 0.1mm; 5) Processing: a) Install the frame on the special tooling with the reference surface A1 (65) facing upwards and fix the frame clamp; b) Mill the internal hollow structure according to the size, fill the non-processed hollow part with shock-absorbing rubber, keep the size of the drawing, and the surface roughness is less than 6.3; mill the skeleton outline according to the size by contour milling, keep the size of the drawing; mill the surface by shape milling according to the reference plane A1 (65), keep the size of the drawing, and keep the flatness 0.1mm and the symmetry 0.1mm; c) Replace the angle fixing plate, position the tooling reference to the reference surface A2 (67), and use the profile milling method to fine-mill the profile surface, maintaining the drawing size, flatness 0.1mm and symmetry 0.1mm d) Turn over and install the frame on the special tooling, fix the frame clamp according to the mark on the clamping base plate (1), with the reference surface B1 (66) facing upwards, and align; mill the surface by contour milling according to the reference surface B1 (66), maintain the drawing size, flatness 0.1mm and symmetry 0.1mm; e) Replace the angle fixing plate, position the tooling reference to the reference surface B2 (68), and fine-mill the profile surface by profile milling, maintaining the drawing dimensions, flatness 0.1 mm and symmetry 0.1 mm; 6) Align the symmetrical center line; drill the bottom hole according to the size and keep the size of the drawing; 7) Tapping through holes; 8) Grinding with the counterweight requires interference fit; 9) Engraving, inspection, packaging and transportation.

2. A method for processing a hollow thin-walled skeleton-like part having a multi-angle composite surface structure according to claim 1, Features: The special tooling is composed of a clamping base plate (1), a fixed base plate (2), an angle fixing plate (3), a rotating shaft (4), and a rotating shaft fixing seat (5), wherein: The clamping base plate (1) is located on the fixed base plate (2), and a positioning pin hole (11) for a workpiece to be processed is provided on the clamping base plate (1); a clamping base plate fixing pin hole (33) is provided on the side wall of the clamping base plate (1), and a fixed base plate positioning pin hole (34) is provided on the side wall of the fixed base plate (2); the angle fixing plate (3) is fixed between the clamping base plate fixing pin hole (33) and the fixed base plate positioning pin hole (34) by means of a positioning pin (31); A through hole is provided on the side wall of the rotating shaft fixing seat (5), and the rotating shaft fixing seat (5) is composed of an upper fixing seat (51) and a lower fixing seat (52), wherein the upper fixing seat (51) is located on the lower surface of the clamping base plate (1), and the lower fixing seat (52) is located on the upper surface of the fixing base plate (2); an end is provided on one side of the rotating shaft (4), and a mounting hole (42) for mounting a slip-proof plug rod (41) is provided on the other side.

3. A method for processing a hollow thin-walled skeleton-like part having a multi-angle composite surface structure according to claim 1, Features: The rotating shaft fixing seat (5) is installed at the center position of the clamping platform of the machine tool, and the side walls of the rotating shaft fixing seat (5) are parallel to the side walls of the clamping base plate (1), and the parallelism is less than 10μm; the two sets of mutually perpendicular side walls of the clamping base plate (1) are equal in length to the parallel sides of the clamping platform, and the error range is less than 1mm.

4. The method for processing the hollow thin-walled characteristic skeleton parts with multi-angle composite surface structure according to claim 1, Features: In step 1), the surface treatment includes grinding, deburring, descaling, and surface sandblasting.

5. The method for processing the hollow thin-walled characteristic skeleton parts with multi-angle composite surface structure according to claim 1, It is characterized in that The part has one or more of the following characteristics: ① The angles of adjacent feature space surfaces of the parts are between 5° and 10°, and the sum of the cumulative angles of adjacent feature space surfaces in the same quadrant plane of the machine tool basic coordinate system is not greater than 15°; ②The minimum wall thickness of the parts is between 1 and 2 mm; ③ The part has a closed-loop contour depression, or a part that has a negative angle during machining and cannot be directly cleaned; ④The surface roughness is required to reach Ra≤3.2μm; ⑤ The sum of the projection areas of the hollow structures of the parts accounts for 50% to 80% of the total surface area.

6. A method for processing a hollow thin-walled skeleton-like part having a multi-angle composite surface structure according to claim 1 or 5, Features: The parts are made of TC6 titanium alloy.

7. A method for processing a hollow thin-walled skeleton-like part having a multi-angle composite surface structure according to claim 1, Features: The three-axis CNC linear machine tool is equipped with a constant temperature chiller and a plate heat exchanger, which are used to low-temperature cool the cutting coolant of the three-axis CNC linear machine tool to ensure that the temperature of the cutting fluid is constant at 10±0.5°C.

8. The method for processing the hollow thin-walled characteristic skeleton parts with multi-angle composite surface structure according to claim 7, Features: A booster device is installed at the cutting fluid nozzle of the three-axis CNC linear machine tool to allow the cutting fluid to enter the tool cutting position in the form of a high-pressure jet.

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