Boring and milling clamp assembly for thin-wall combustion chamber engine shell and assembling method

Abstract

The invention provides a boring and milling clamp assembly for a thin-wall combustion chamber engine shell and an assembling method of the boring and milling clamp assembly. The clamp assembly comprises a foundation bottom plate, a first supporting and clamping assembly, a second supporting and clamping assembly, a positioning supporting frame and an auxiliary supporting assembly, and stable clamping and accurate positioning of the shell are achieved. The first supporting and clamping assembly and the second supporting and clamping assembly are of detachable semi-ring structures and are provided with positioning pins, bolts with torsion sensors and deformation sensors, it is ensured that the clamping force is moderate, and shell deformation is monitored. The positioning supporting frame is matched with the auxiliary supporting assembly, and accurate positioning of the shell is achieved through the pneumatic pin. The assembling method comprises the steps that the clamp assembly is hoisted to a workbench, the position reference is determined, the shell is placed, the pneumatic pin is driven to achieve positioning, the shell is clamped, the roundness of an inner hole is detected, and finally the shell is taken out. The machining precision and the production efficiency are improved, the shell is protected against damage, and wide applicability is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a boring and milling processing fixture assembly and an assembly method for a thin-wall combustion chamber engine casing. Background Art

[0002] Due to its thin wall and poor rigidity, the thin-walled combustion engine casing is very easy to deform, rotate or move axially during boring and milling due to improper clamping or inaccurate positioning, thus affecting the processing accuracy and quality of the finished product. There are currently two common solutions: one is to install adjustable rigid rings on the joints at both ends of the combustion chamber casing, and then place the rigid rings on the boring processing bracket, use half rings to clamp and fix them, and use the adjusting screws on the rigid rings to adjust the roundness and coaxiality of the front and rear joints; the other is to use a boring processing bracket, place the joints at both ends of the casing on the bracket and use half rings to clamp them. The main problem with method one is that it is not versatile and takes a long time to install and adjust; the main problem with method two is that the clamping force is difficult to control. If the clamping force is too large, the thin wall of the front and rear joints will produce elastic deformation. If the clamping force is too small, it cannot achieve the purpose of fixing. The positioning of the tooling is incomplete, and the product is prone to rotation or movement during processing, causing quality problems.

[0003] Traditional fixture designs often have difficulty balancing clamping force and deformation control, and are difficult to meet the needs of high-precision and high-efficiency processing. Therefore, developing a new type of fixture assembly to achieve stable clamping and precise positioning of thin-walled shells has become an urgent problem to be solved in the field of mechanical processing. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an efficient and stable fixture assembly and assembly method for the boring and milling process of thin-walled combustion engine casings. The fixture assembly is intended to solve the problems of easy deformation and difficult positioning of thin-walled casings during the processing process, so as to improve the processing accuracy and production efficiency.

[0005] To achieve the above object, the present invention is implemented by the following technical solutions:

[0006] In one aspect, the present invention provides a boring and milling fixture assembly for a thin-walled combustion chamber engine casing, the fixture assembly comprising:

[0007] foundation slab;

[0008] A first support and clamping assembly, the first support and clamping assembly is installed on the top surface close to the front end of the base bottom plate, and the first support and clamping assembly is used to support and clamp the front joint of the housing;

[0009] A second support and clamping assembly, the second support and clamping assembly is installed on the top surface close to the rear end of the base bottom plate, and the second support and clamping assembly is used to support and clamp the rear joint of the housing;

[0010] A positioning support frame, the positioning support frame is installed on the top surface of the middle position of one side of the base bottom plate, and the top surface of the positioning support frame is used to fit with the lower surface of the positioning block on the side of the shell;

[0011] An auxiliary support assembly is installed on the top surface of the middle position of the other side of the basic base plate, and the auxiliary support assembly is used to push the positioning block on one side of the shell so that the top surface of the positioning support frame fits with the lower surface of the positioning block on the other side of the shell.

[0012] As a further optimization scheme of the present invention, positioning keys for determining the relative angular position of the fixture assembly and the boring and milling machine worktable are installed on the bottom surface of the base plate, U-shaped grooves for fixing the fixture assembly to the boring and milling machine worktable are provided at the front and rear ends of the base plate, and a first lateral reference band is installed on the side wall of the base plate.

[0013] As a further optimization scheme of the present invention, the first supporting clamping assembly includes a first positioning supporting half ring and a first positioning fixing half ring that are detachably connected, the bottom of the first positioning supporting half ring is fixedly connected to the top surface of the base bottom plate, and the first positioning fixing half ring is buckled on the top of the first positioning supporting half ring to form a circular ring structure for clamping the shell.

[0014] As a further optimization scheme of the present invention, positioning pins and bolts with torque sensors are installed on the connecting ears on both sides of the first positioning support half ring, and positioning pin holes and bolt holes for the positioning pins and bolts with torque sensors to pass through are opened on the connecting ears on both sides of the first positioning fixing half ring, and the bolts with torque sensors are passed through the bolt holes and then fastened by nuts; a deformation sensor is installed on the outer circular surface of the front joint of the shell.

[0015] As a further optimization solution of the present invention, an axial limit block is provided on the inner ring surface of the first positioning support half ring close to the front end of the base bottom plate.

[0016] As a further optimization scheme of the present invention, a second lateral reference belt is installed on both side walls of the first positioning support half ring, and the lateral reference belt is used to determine the vertical process reference of the center of the fixture assembly; a front end reference belt is installed at the front end of the first positioning support half ring, and the front end reference belt is used to determine the horizontal process reference of the center of the fixture assembly.

[0017] As a further optimization scheme of the present invention, the second supporting and clamping assembly includes a second positioning supporting half ring and a second positioning fixing half ring that are detachably connected, the bottom of the second positioning supporting half ring is fixedly connected to the top surface of the base bottom plate, and the second positioning fixing half ring is buckled on the top of the second positioning supporting half ring to form a circular ring structure for clamping the shell; the second positioning supporting half ring is equipped with a first pneumatic pin with a pressure sensor at the middle position close to one side of the first supporting and clamping assembly, and the first pneumatic pin moves linearly along the axial direction of the shell.

[0018] As a further optimization scheme of the present invention, positioning pins and bolts with torque sensors are installed on the connecting ears on both sides of the second positioning support half ring, and positioning pin holes and bolt holes for the positioning pins and bolts with torque sensors to pass through are opened on the connecting ears on both sides of the second positioning fixing half ring, and the bolts with torque sensors pass through the bolt holes and are then fastened and connected by nuts; a deformation sensor is installed on the outer circular surface of the rear joint of the shell.

[0019] As a further optimization scheme of the present invention, the auxiliary support assembly includes an auxiliary support frame body and a second pneumatic pin with a pressure sensor. The auxiliary support frame body is at the same height as the positioning support frame, and the second pneumatic pin moves up and down in a vertical direction.

[0020] On the other hand, the present invention provides an assembly method of the boring and milling fixture assembly for a thin-walled combustion chamber engine casing, comprising the following steps:

[0021] Lift the fixture assembly onto the boring and milling machine workbench, use the positioning key to ensure that the axis of the assembly is parallel to the axis of the boring and milling machine spindle, and fix it with U-shaped grooves and bolts with T-shaped blocks;

[0022] Determine the position reference of the assembly relative to the boring and milling machine through the first lateral reference band, the second lateral reference band and the front end reference band;

[0023] Remove the first and second positioning and fixing half rings, hoist the combustion chamber engine casing and place the casing on the first and second positioning and supporting half rings according to the position of the front and rear joints of the casing, with quadrant I at the upper end and quadrant III at the lower end. The front joint clamping belt coincides with the inner hole clamping position of the first positioning and supporting half ring, and the rear joint clamping belt coincides with the clamping position of the second positioning and supporting half ring.

[0024] The first pneumatic pin is driven to push the housing forward to a limited position, so that the end face of the front joint of the housing fits with the inner side face of the axial limit block;

[0025] The second pneumatic pin is driven to push the housing upward to rotate, so that the lower surface of the positioning block on the housing fits with the upper surface of the positioning support frame;

[0026] The first and second positioning and fixing half rings are respectively placed on the front and rear joints of the shell, and respectively assembled to the first and second positioning and supporting half rings, and fixed and tested for the roundness of the inner hole;

[0027] After the processing is completed, the first and second positioning and fixing half rings are removed, the first and second pneumatic pins are restored to their initial positions, and the combustion chamber housing is removed.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The present invention realizes stable clamping of the front and rear joints of the thin-walled combustion chamber engine casing by designing a first support clamping assembly and a second support clamping assembly, and utilizing a detachably connected first positioning support half ring and a first positioning fixing half ring (as well as a second positioning support half ring and a second positioning fixing half ring). The coordinated use of the positioning support frame and the auxiliary support assembly ensures accurate positioning of the casing during processing, avoiding processing errors caused by inaccurate positioning. The use of bolts with torque sensors and deformation sensors can monitor the clamping force and deformation of the casing in real time, thereby adjusting processing parameters in a timely manner to ensure processing accuracy.

[0030] (2) The axial limit block in the first support clamping assembly and the first pneumatic pin in the second support clamping assembly jointly limit the axial and radial movement of the shell, thereby enhancing the stability of the clamping. The second pneumatic pin in the auxiliary support assembly can push the positioning block on one side of the shell by moving up and down in the vertical direction, so that the positioning block on the other side of the shell fits with the positioning support frame, further improving the stability of the clamping.

[0031] (3) The fixture assembly of the present invention is reasonably designed, has a short installation time, and can quickly adapt to the processing requirements of thin-walled combustion chamber engine housings of different sizes. Through the use of automated control pneumatic pins and sensors, the steps and time of manual operation are reduced, and production efficiency is improved.

[0032] (4) The clamp assembly of the present invention adopts a detachable half-ring structure, which avoids the damage to the shell caused by excessive clamping force in traditional clamps. By accurately controlling the clamping force and the movement of the pneumatic pin, it is ensured that the shell will not be subjected to excessive pressure or deformation during the processing, thereby protecting the integrity of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The structure of the clamp assembly of the present invention is schematically shown in FIG. Figure 1 .

[0034] Figure 2 The structure of the clamp assembly of the present invention is schematically shown in FIG. Figure 2 .

[0035] Figure 3 The structure of the clamp assembly of the present invention is schematically shown in FIG. Figure 3 .

[0036] Figure 4 The structure diagram of the housing of the present invention being assembled on the fixture assembly is shown in FIG. Figure 1 .

[0037] Figure 5 The structure diagram of the housing of the present invention being assembled on the fixture assembly is shown in FIG. Figure 2 .

[0038] Figure 6 The structure diagram of the housing of the present invention being assembled on the fixture assembly is shown in FIG. Figure 3 .

[0039] Figure 7 The structure diagram of the housing of the present invention being assembled on the fixture assembly is shown in FIG. Figure 4 .

[0040] 1. Base plate; 101. Positioning key; 102. U-shaped groove; 103. First lateral reference band; 2. First support and clamping assembly; 201. First positioning support half ring; 202. First positioning fixing half ring; 203. Axial limit block; 204. Second lateral reference band; 205. Front end reference band; 3. Second support and clamping assembly; 301. Second positioning support half ring; 302. Second positioning fixing half ring; 303. First pneumatic pin; 3001. First pin shaft; 3002. First cylinder; 4. Positioning support frame; 5. Auxiliary support assembly; 501. Auxiliary support frame body; 502. Second pneumatic pin; 5001. Second pin shaft; 5002. Second cylinder; 6. Shell; 601. Positioning block; 602. Front joint clamping band; 603. Rear joint clamping band; 7. Connecting ear; 8. Positioning pin; 9. Bolt; 10. Nut. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary description and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only for exemplary description and cannot be understood as a limitation on this patent.

[0042] like Figures 1 to 3As shown, the present invention provides a boring and milling fixture assembly for a thin-walled combustion chamber engine housing, the fixture assembly comprising: a base plate 1, a first support clamping assembly 2, a second support clamping assembly 3, a positioning support frame 4, an auxiliary support assembly 5 and an intelligent control system. The fixture assembly supports and clamps the front and rear joints of the housing 6 through the first support clamping assembly 2 and the second support clamping assembly 3, and ensures the accurate positioning of the housing 6 through the positioning support frame 4 and the auxiliary support assembly 5. This design improves the stability and processing accuracy of the thin-walled combustion chamber engine housing 6 during the boring and milling process.

[0043] In some examples, two positioning keys 101 for determining the relative angle position between the fixture assembly and the boring and milling machine table are installed on the bottom surface of the base plate 1, four U-shaped grooves for fixing the fixture assembly to the boring and milling machine table are opened at the front and rear ends of the base plate 1, and a first lateral reference band 103 is installed on the side wall of the base plate 1. The positioning keys 101, U-shaped grooves and the first lateral reference band 103 are installed on the base plate 1 to determine the relative position and angle between the fixture assembly and the boring and milling machine table. This design facilitates the rapid and accurate installation and positioning of the fixture assembly, and improves work efficiency and processing accuracy.

[0044] In some examples, the first support clamping assembly 2 is installed on the top surface at a position 70 mm away from the front end of the base bottom plate 1, and the first support clamping assembly 2 is used to support the front joint of the clamping housing 6. The second lateral reference belt 204 is installed on both side walls of the first positioning support semi-ring 201, and the lateral reference belt is used to determine the vertical process reference of the center of the fixture assembly; the front end of the first positioning support semi-ring 201 is installed with a front end reference belt 205, and the front end reference belt 205 is used to determine the horizontal process reference of the center of the fixture assembly. This design provides the fixture assembly with process references in the vertical and horizontal directions, ensuring the processing accuracy.

[0045] Specifically, the first support clamping assembly 2 includes a detachably connected first positioning support half ring 201 and a first positioning fixing half ring 202. The bottom of the first positioning support half ring 201 is fixedly connected to the top surface of the base bottom plate 1. The first positioning fixing half ring 202 is buckled on the top of the first positioning support half ring 201 to form a circular ring structure for clamping the shell 6. This design is easy to install and disassemble, adapt to shells 6 of different sizes, and improve the versatility and flexibility of the clamp. The two side connecting ears 7 of the first positioning support half ring 201 are both installed with positioning pins 8 and bolts 9 with torque sensors. The two side connecting ears 7 of the first positioning fixing half ring 202 are both provided with positioning pin holes and bolt holes for the positioning pins 8 and the bolts 9 with torque sensors to pass through. The bolts 9 with torque sensors pass through the bolt holes and are then fastened by nuts 10. Among them, the bolt 9 with a torque sensor is a fastener with integrated torque sensing function, which is mainly composed of a bolt 9 body and a torque sensor. The torque sensor is the core part of the bolt 9, which is usually installed at a certain position of the bolt 9 body (such as below the head of the bolt 9 or the threaded part) to measure and record the torque applied to the bolt 9. The torque sensor contains strain gauges or other types of sensing elements, which can convert torque into electrical signals for reading and analysis by the intelligent control system.

[0046] Furthermore, a deformation sensor is installed on the outer circular surface of the front joint of the shell 6, which is used to detect the change in roundness when tightening the first positioning and fixing half ring 202. It can monitor the clamping force and the deformation of the shell 6 in real time to ensure stability and safety during the processing. The first positioning and supporting half ring 201 is provided with two axial limit blocks 203 on the inner ring surface near the front end of the base bottom plate 1, which limits the axial movement of the shell 6 and improves the stability of the clamping. A gap of 0.2mm is reserved between the assembly surface of the first positioning and fixing half ring 202 and the connecting ear 7 of the first positioning and supporting half ring 201. The inner hole diameter of the first positioning and supporting half ring 201 and the first positioning and fixing half ring 202 = the diameter of the front installation reference surface of the combustion chamber shell 6 + 0.02mm.

[0047] In some examples, the second support clamping assembly 3 is installed on the top surface at a position 70 mm away from the rear end of the base plate 1, and the second support clamping assembly 3 is used to support and clamp the rear joint of the shell 6. Specifically, the second support clamping assembly 3 includes a detachably connected second positioning support half ring 301 and a second positioning fixing half ring 302, the bottom of the second positioning support half ring 301 is fixedly connected to the top surface of the base plate 1, and the second positioning fixing half ring 302 is buckled on the top of the second positioning support half ring 301 to form a circular ring structure for clamping the shell 6; the second positioning support half ring 301 is installed with a first pneumatic pin 303 with a pressure sensor at the middle position of one side close to the first support clamping assembly 2, and the first pneumatic pin 303 moves linearly along the axial direction of the shell 6. The connecting ears 7 on both sides of the second positioning support half ring 301 are both installed with positioning pins 8 and bolts 9 with torque sensors. The connecting ears 7 on both sides of the second positioning fixing half ring 302 are both provided with positioning pin holes and bolt holes for the positioning pins 8 and the bolts 9 with torque sensors to pass through. The bolts 9 with torque sensors pass through the bolt holes and are then fastened with nuts 10. This design facilitates installation and disassembly, and can monitor the clamping force in real time to ensure stability and safety during processing.

[0048] Furthermore, the first pneumatic pin 303 with a pressure sensor is a positioning element that combines pneumatic drive and pressure measurement functions, and is used in conjunction with the positioning block 601 on the housing 6. It is mainly composed of a first pin shaft 3001, a first cylinder 3002, and a pressure sensor. The pressure sensor is installed inside the cylinder of the pneumatic pin or at the connection between the cylinder and the pneumatic pin to accurately measure the air pressure changes inside the cylinder. The measured value of the pressure sensor is displayed in real time on the intelligent control system to timely understand the driving force changes of the pneumatic pin, and the pressure value is used to detect whether the front joint end face of the housing 6 is in place (i.e., whether the joint end face is in contact with the axial limit block 203).

[0049] Furthermore, a deformation sensor is installed on the outer circular surface of the rear joint of the shell 6, which is used to detect the change of roundness when tightening the second positioning and fixing half ring 302, and can monitor the clamping force and the deformation of the shell 6 in real time to ensure the stability and safety during the processing. A 0.2mm gap is reserved between the assembly surface of the second positioning and fixing half ring 302 and the connecting ear 7 of the second positioning and supporting half ring 301. The inner hole diameter of the second positioning and supporting half ring 301 and the second positioning and fixing half ring 302 = the diameter of the front installation reference surface of the combustion chamber shell 6 + 0.02mm.

[0050] In some examples, the positioning support frame 4 is installed on the top surface in the middle of one side of the base plate 1, and the position of the positioning support frame 4 is consistent with the position of the positioning block 601 in the middle of the shell 6, and the top surface of the positioning support frame 4 is used to fit with the lower surface of the positioning block 601 on the side of the shell 6.

[0051] In some examples, the auxiliary support assembly 5 is installed on the top surface of the middle position of the other side of the base plate 1. The auxiliary support assembly 5 is used to make the top surface of the positioning support frame 4 fit with the lower surface of the positioning block 601 on the other side of the shell 6 by pushing the positioning block 601 on one side of the shell 6, further improving the stability of clamping and processing accuracy. Specifically, the auxiliary support assembly 5 includes an auxiliary support frame body 501 and a second pneumatic pin 502 with a pressure sensor. The auxiliary support frame body 501 is at the same height as the positioning support frame 4. The position of the auxiliary support frame body 501 is consistent with the position of the positioning block 601 in the middle position of the shell 6. The second pneumatic pin 502 moves up and down in the vertical direction to push the positioning block 601.

[0052] Furthermore, the second pneumatic pin 502 with a pressure sensor is a positioning element that combines pneumatic drive and pressure measurement functions, and is mainly composed of a second pin shaft 5001, a second cylinder 5002, and a pressure sensor. The pressure sensor is installed inside the cylinder of the pneumatic pin or at the connection between the cylinder and the pneumatic pin to accurately measure the pressure change inside the cylinder. The measured value of the pressure sensor is displayed in real time on the intelligent control system to timely understand the driving force change of the pneumatic pin, and the pressure value is used to detect whether the positioning block 601 on the housing 6 is in place (i.e., whether the lower surface of the positioning block 601 is in contact with the top surface of the positioning support frame 4).

[0053] In some examples, the intelligent control system is integrated into the fixture assembly and is responsible for coordinating the workflow of each part. The intelligent control system collects data on each positioning pin 8, clamping force, and deformation of the shell 6 during the processing process through pressure sensors, torque sensors, and deformation sensors, and automatically adjusts and optimizes according to preset algorithms and parameters. At the same time, the control system also has fault diagnosis and abnormal alarm functions to ensure the safety and stability of the processing process.

[0054] In some examples, the bottom surface of the base plate 1, the positioning key 101, the first and second positioning support semi-rings, the positioning support frame 4, the auxiliary support frame body 501, the first and second positioning fixing semi-rings are all made of alloy structural steel and are quenched and tempered, with a modulated hardness of 38-43HRC. The positioning pin 8 and the pneumatic pin are made of alloy tool steel and are quenched and tempered, with a quenched and tempered hardness of 45-52HRC.

[0055] like Figures 4 to 7As shown, the material of a certain type of mass-produced thin-walled combustion chamber shell 6 is D406A ultra-high strength steel, with a total length of 1010mm, an outer diameter of 402mm, and an overall appearance of 2.8mm thin-walled structure. The cylindrical section is formed by turning technology with a roundness of 0.02mm. After the combustion chamber shell 6 of this type is welded and formed, its front and rear interfaces and the clamping reference belt for milling need to be precisely turned on a CNC lathe, and the outer circle, inner hole and the hole system on the end face of the side wall fixed support of the front and rear joints need to be precisely milled on a CNC boring and milling machine. The selected processing equipment is the HTM160 CNC boring and milling machine, with a worktable size of 1800*1600mm and a maximum stroke of 2500*2000*1500mm. The specific implementation plan is:

[0056] 1) Lift the fixture assembly onto the boring machine workbench. The bottom surface of the assembly base plate 1 contacts the workbench surface. Align the two positioning keys 101 with the center reference T-slot of the workbench to ensure that the axis of the assembly is parallel to the axis of the machine tool spindle. Insert the four bolts 9 with T-blocks into the U-slot of the fixture assembly base along the fixed slot position, and tighten the nuts 10 at four locations with a torque wrench. The torque requirement is 195n.m.

[0057] 2) The position reference of the fixture assembly relative to the CNC boring and milling machine is determined by the first lateral reference band 103 , the second lateral reference band 204 and the front end reference band 205 .

[0058] 3) Remove the first and second positioning and fixing half rings, hoist the combustion chamber engine casing 6 and place the casing 6 on the first and second positioning and supporting half rings according to the direction of the front and rear joint quadrant positions of the casing 6, with quadrant I at the upper end and quadrant III at the lower end. The front joint clamping band 602 coincides with the inner hole clamping position of the first positioning and supporting half ring 201, and the rear joint clamping band 603 coincides with the clamping position of the second positioning and supporting half ring 301.

[0059] 4) Start the intelligent control system to drive the first pneumatic pin 303 to push the shell 6 forward, so that the front joint end face of the shell 6 fits with the inner side faces of the two axial limit blocks 203 in the lower half of the first positioning support half ring 201.

[0060] 5) Use the intelligent control system to drive the second pneumatic pin 502 on the auxiliary support frame to move, push the positioning block 601 on the shell 6, so that the lower end reference surface of the positioning block 601 of the shell 6 fits with the upper end surface of the positioning support frame 4, and the central horizontal position of the positioning blocks 601 on both sides of the shell 6 coincides with the horizontal central axis of the assembly fixture.

[0061] 6) Manually install the second positioning and fixing half ring 302 on the reference band of the rear joint of the shell 6, and assemble it to the second positioning support half ring 301. The two positioning pin 8 holes of the connecting ears 7 on both sides of the second positioning and fixing half ring 302 are aligned with the positioning pins 8 of the connecting ears 7 on both sides of the second positioning support half ring 301. The bolts 9 with torque sensors on the connecting ears 7 on both sides of the second positioning support half ring 301 pass through the through holes and are fixed by nuts 10. Use an external hexagonal wrench to tighten the nuts 10 to make the torque value of the torque sensor reach 135n.m. Use the deformation sensor on the outer circle of the shell 6 to monitor the roundness of the inner hole of the rear joint to make the inner hole circle runout within 0.01-0.02mm.

[0062] 7) Manually install the first positioning and fixing half ring 202 on the reference band of the front joint of the shell 6, and assemble it to the first positioning support half ring 201. The two positioning pin 8 holes of the connecting ears 7 on both sides of the first positioning and fixing half ring 202 are aligned with the positioning pins 8 of the connecting ears 7 on both sides of the first positioning support half ring 201. The bolts 9 with torque sensors on the connecting ears 7 on both sides of the first positioning support half ring 201 pass through the through holes and are fixed by nuts 10. Use an external hexagonal wrench to tighten the nuts 10 to make the torque value of the torque sensor reach 20n.m. Use the deformation sensor on the outer circle of the shell 6 to detect the roundness of the inner hole of the front joint to make the inner hole circle runout within 0.01-0.02mm.

[0063] 8) After the front and rear joints and the mounting block holes of the combustion chamber shell 6 are processed according to the process requirements, loosen the nuts 10 on the first and second fixing half rings, remove the first and second positioning and fixing half rings, and the intelligent control system controls the pneumatic pins with pressure sensors to restore their initial positions, remove the deformation sensors, and use a crane to lift out the combustion chamber shell 6.

[0064] The assembly method has clear steps and is easy to operate, which can ensure the correct installation of the fixture assembly and the accurate processing of the shell, thereby improving work efficiency and processing quality.

[0065] The invention realizes stable clamping and precise positioning of thin-walled shells by optimizing the clamping structure, enhancing positioning accuracy and introducing auxiliary support devices and other innovative designs. After the application of the clamp, the production efficiency of thin-walled engine combustion engine shells will be increased by 55%, and the production cost will be reduced by about 38%. The implementation of the clamp assembly will help improve the processing quality and production efficiency of thin-walled engine combustion engine shells and promote the progress and development of mechanical processing technology.

[0066] The deformation sensor, the bolt with the torque sensor and the pneumatic pin with the pressure sensor in the present invention are all obtained from conventional commercial channels or made by conventional methods. Their specific structures, working principles and possible control methods and spatial arrangements can be selected conventionally in the art and should not be regarded as the innovative points of the present invention. They are understandable to those skilled in the art and the patent of the present invention will not be further elaborated.

[0067] In summary, the present invention provides an efficient, stable and precise boring and milling fixture assembly and assembly method for thin-walled combustion chamber engine casings, which significantly improves machining accuracy and production efficiency, while protecting the casing from damage and improving versatility and flexibility.

[0068] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the detachable three-dimensional ecological drainage ditch structure of the present invention, and can produce the positive effects recorded in the present invention.

[0069] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0070] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A boring and milling fixture assembly for a thin-walled combustion chamber engine housing, characterized in that: The fixture assembly comprises: Foundation slab (1); A first supporting and clamping assembly (2), the first supporting and clamping assembly (2) being mounted on a top surface close to the front end of the base plate (1), the first supporting and clamping assembly (2) being used to support and clamp the front joint of the housing (6); A second supporting and clamping assembly (3), the second supporting and clamping assembly (3) being mounted on a top surface close to the rear end of the base plate (1), the second supporting and clamping assembly (3) being used to support and clamp the rear joint of the housing (6); A positioning support frame (4), the positioning support frame (4) being mounted on the top surface of a middle position on one side of the base bottom plate (1), the top surface of the positioning support frame (4) being used to fit with the lower surface of a positioning block (601) on the side of the shell (6); An auxiliary support assembly (5), the auxiliary support assembly (5) is installed on the top surface of the middle position of the other side of the base base plate (1), and the auxiliary support assembly (5) is used to push the positioning block (601) on one side of the shell (6) to make the top surface of the positioning support frame (4) fit with the lower surface of the positioning block (601) on the other side of the shell (6).

2. The boring and milling fixture assembly for thin-walled combustion chamber engine housing according to claim 1 is characterized in that: A positioning key (101) for determining the relative angular position of the fixture assembly and the boring and milling machine worktable is installed on the bottom surface of the base plate (1), U-shaped grooves for fixing the fixture assembly to the boring and milling machine worktable are provided at both the front and rear ends of the base plate (1), and a first lateral reference belt (103) is installed on the side wall of the base plate (1).

3. The boring and milling fixture assembly for a thin-walled combustion chamber engine housing according to claim 1 is characterized in that: The first supporting clamping assembly (2) comprises a first positioning supporting half ring (201) and a first positioning fixing half ring (202) which are detachably connected, wherein the bottom of the first positioning supporting half ring (201) is fixedly connected to the top surface of the base bottom plate (1), and the first positioning fixing half ring (202) is buckled on the top of the first positioning supporting half ring (201) to form a circular ring structure for clamping the shell (6).

4. The boring and milling fixture assembly for a thin-wall combustion chamber engine housing according to claim 3 is characterized in that: Positioning pins (8) and bolts (9) with torque sensors are installed on the connecting ears (7) on both sides of the first positioning support half ring (201), and positioning pin holes and bolt holes for the positioning pins (8) and the bolts (9) with torque sensors to pass through are opened on the connecting ears (7) on both sides of the first positioning fixing half ring (202), and the bolts (9) with torque sensors are fastened and connected by nuts (10) after passing through the bolt holes; a deformation sensor is installed on the outer circumferential surface of the front joint of the shell (6).

5. The boring and milling fixture assembly for thin-wall combustion chamber engine housing according to claim 3 is characterized in that: The first positioning support half ring (201) is provided with an axial limit block (203) on the inner ring surface close to the front end of the base bottom plate (1).

6. The boring and milling fixture assembly for a thin-wall combustion chamber engine housing according to claim 3 is characterized in that: A second lateral reference belt (204) is installed on both side walls of the first positioning support half ring (201), and the lateral reference belt is used to determine the vertical process reference of the center of the fixture assembly; a front end reference belt (205) is installed at the front end of the first positioning support half ring (201), and the front end reference belt (205) is used to determine the horizontal process reference of the center of the fixture assembly.

7. The boring and milling fixture assembly for a thin-wall combustion chamber engine casing according to claim 1, characterized in that: The second supporting and clamping assembly (3) comprises a second positioning supporting half ring (301) and a second positioning fixing half ring (302) which are detachably connected, wherein the bottom of the second positioning supporting half ring (301) is fixedly connected to the top surface of the base bottom plate (1), and the second positioning fixing half ring (302) is buckled on the top of the second positioning supporting half ring (301) to form a circular ring structure for clamping the shell (6); the second positioning supporting half ring (301) is provided with a first pneumatic pin (303) with a pressure sensor at a middle position close to one side of the first supporting and clamping assembly (2), and the first pneumatic pin (303) moves linearly along the axial direction of the shell (6).

8. The boring and milling fixture assembly for thin-wall combustion chamber engine housing according to claim 7, characterized in that: Positioning pins (8) and bolts (9) with torque sensors are installed on the connecting ears (7) on both sides of the second positioning support half ring (301), and positioning pin holes and bolt holes for the positioning pins (8) and the bolts (9) with torque sensors to pass through are opened on the connecting ears (7) on both sides of the second positioning fixing half ring (302), and the bolts (9) with torque sensors are fastened and connected by nuts (10) after passing through the bolt holes; a deformation sensor is installed on the outer circumferential surface of the rear joint of the shell (6).

9. The boring and milling fixture assembly for thin-wall combustion chamber engine housing according to claim 1, characterized in that: The auxiliary support assembly (5) comprises an auxiliary support frame body (501) and a second pneumatic pin (502) with a pressure sensor, the auxiliary support frame body (501) is at the same height as the positioning support frame (4), and the second pneumatic pin (502) moves up and down in a vertical direction.

10. An assembly method of a boring and milling fixture assembly for a thin-walled combustion chamber engine housing according to any one of claims 1 to 9, characterized in that: The following steps are involved: The fixture assembly is hoisted as a whole onto the workbench of the boring and milling machine, and the axis of the assembly is made parallel to the axis of the spindle of the boring and milling machine by means of a positioning key (101), and is fixed by means of a U-shaped groove and a bolt (9) with a T-shaped block; Determining the position reference of the fixture assembly relative to the boring and milling machine through the first lateral reference band (103), the second lateral reference band (204) and the front end reference band (205); Remove the first and second positioning and fixing half rings, hoist the combustion chamber engine casing (6) and place the casing (6) on the first and second positioning and supporting half rings in the direction that the front and rear joint quadrant positions of the casing (6) are in the direction that quadrant I is at the upper end and quadrant III is at the lower end, the front joint clamping band (602) coincides with the inner hole clamping position of the first positioning and supporting half ring (201), and the rear joint clamping band (603) coincides with the clamping position of the second positioning and supporting half ring (301); Driving the first pneumatic pin (303) to push the housing (6) forward to a limited position, so that the front joint end face of the housing (6) fits into the inner side face of the axial limit block (203); The second pneumatic pin (502) is driven to push the housing (6) upward to rotate, so that the lower surface of the positioning block (601) on the housing (6) fits with the upper surface of the positioning support frame (4); The first and second positioning and fixing half rings are respectively placed on the front and rear joints of the housing (6), and respectively assembled on the first and second positioning and supporting half rings to fix and detect the roundness of the inner hole; After the processing is completed, the first and second positioning and fixing half rings are removed, the first and second pneumatic pins are restored to their initial positions, and the combustion chamber housing (6) is removed.

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