Water chiller compressor cylinder body combined finishing tool and process

Abstract

The application relates to the technical field of combined machining, and discloses a combined finish machining tool and process for a water chiller compressor cylinder body, which comprises a machine tool body, wherein a precision milling station, a cleaning station and a tapping station are arranged on the machine tool body respectively. The spray head can rotate in a circumferential direction and automatically change a spraying angle along with a lifting stroke. During operation, the spray head is gradually lifted at a uniform speed along a through hole axis, completely penetrates the whole through hole of a workpiece and continuously rotates and blows air at the same time. A mechanical linkage structure formed by a pressing plate, a guide block and a top rod is used. The spraying angle of the spray head can automatically adapt to the moving direction of the spray head during upward movement and return movement. The inclination angle is synchronously adjusted during the whole process. Overall, the structure can cover all areas of the through hole wall and the hole bottom in all directions, has no cleaning blind area, can efficiently and completely remove the mixed iron filings and cutting fluid chips adhered in the hole, reduces the machining chip residues in the tapping through hole, and provides a clean and impurity-free machining hole position for the subsequent tapping process.

Description

Technical Field

[0001] This invention belongs to the field of combined processing technology, specifically, it relates to a combined precision machining tooling and process for the cylinder block of a chiller unit compressor. Background Technology

[0002] As a core pressure-bearing component of the chiller unit, the compressor cylinder block of the chiller unit directly determines the assembly sealing performance and operational stability of the entire compressor by its end face accuracy, mounting through hole size accuracy, and thread hole fit accuracy. At present, the mainstream processing technology of the compressor cylinder block consists of two core processes: end face and through hole precision milling and hole tapping. These two processes are mostly completed step by step using split processing equipment.

[0003] In the current precision milling process of compressor cylinder block workpieces, the metal chips and viscous machining debris generated during milling, mixed with cutting fluid, are very likely to remain inside the through holes that need to be tapped later. In addition, the fine debris will adhere to the gaps in the hole wall. If it is not cleaned, the tap will come into direct contact with the hard debris, which will cause the tap edge to wear quickly and break, significantly increasing the tool replacement cost and shortening the service life of the tapping tool. Furthermore, the debris mixed between the tap and the inner wall of the through hole will participate in thread cutting, resulting in incomplete thread profile, scratches on the thread pattern, and deviations in the pitch accuracy. As a result, the threaded hole cannot meet the assembly tolerance requirements, and the workpiece is scrapped.

[0004] Conventional air-blowing cleaning structures mostly use direct-blowing nozzles with a fixed blowing angle, resulting in obvious blind spots in the upper and lower areas of the hole, which cannot completely remove residual debris from the bottom and corners of the hole.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0007] A combined precision machining fixture for the cylinder block of a chiller unit compressor includes a machine tool body, on which a precision milling station, a cleaning station and a tapping station are respectively provided;

[0008] A slide block is slidably mounted on the machine tool body, and the slide block holds the workpiece.

[0009] The precision milling station is equipped with precision milling components;

[0010] A base is vertically and slidably installed on the cleaning station. A connecting pipe is rotatably installed on the base and connected to an external air pipe. A nozzle is rotatably installed on the side wall of the connecting pipe and communicates with it. The nozzle is inclined and corresponds to the side wall of the workpiece through hole. A rocker arm is installed at the center of rotation of the nozzle. A timing frame is slidably installed on the rocker arm, and a push rod is slidably installed on the timing frame. A compression spring is installed between the push rod and the timing frame. An adjusting block is installed on the top of the connecting pipe, and a displacement groove is opened on the adjusting block to slidably connect with the push rod. A first slot and a second slot are opened in sequence on the side wall of the displacement groove. A guide block is installed on the base and the guide block is triangular. A pressure plate is installed on the machine tool body. The pressure plate and the guide block are used to adjust the angle of the nozzle's forward and return strokes.

[0011] The tapping station is equipped with a tapping assembly.

[0012] In a preferred embodiment of the present invention, an electric slide rail is installed on the machine tool body, a slide block is installed on the electric slide rail, a shifting motor is installed at the bottom of the slide block, the output shaft of the shifting motor moves through the slide block, and a three-jaw chuck is installed at the end of the output shaft of the shifting motor, and a workpiece is clamped on the three-jaw chuck.

[0013] In a preferred embodiment of the present invention, a displacement electric push rod is installed on the cleaning station of the machine tool body. A connecting frame is installed at the output end of the displacement electric push rod. The side wall of the connecting frame is connected to the base. A drive motor is installed at the bottom of the base. A transmission shaft is installed at the output end of the drive motor. The transmission shaft moves through the base. The end of the output end of the transmission shaft is connected to the bottom of the connecting pipe.

[0014] In a preferred embodiment of the present invention, a sealing cover is installed on the base, the sealing cover is rotatably connected to the connecting pipe, the connecting pipe has a notch and the notch is connected to the sealing cover, an input pipe is installed on the side wall of the sealing cover and the input pipe is connected to the high-pressure gas delivery system, a hose is installed at the end of the nozzle and the hose is connected to the connecting pipe, and the top of the sealing cover is connected to the guide block and the guide block is in an inclined state.

[0015] In a preferred embodiment of the present invention, a positioning seat is installed on the outer wall of the connecting pipe, the nozzle is rotatably connected to the positioning seat, a strip groove is provided on the rocker arm, a slide rod is slidably installed on the strip groove, and the two ends of the slide rod are connected to the synchronization frame.

[0016] In a preferred embodiment of the present invention, a plug rod is movably installed through the synchronization frame, and sockets are installed at both ends of the plug rod. The sidewall of the socket is installed on the sidewall of the connecting pipe. A compression spring is sleeved on the outer sidewall of the plug rod. One end of the compression spring is engaged with the sidewall of the synchronization frame, and the other end of the compression spring is engaged with the socket. The compression spring is used to drive the synchronization frame to have an upward force.

[0017] In a preferred embodiment of the present invention, an arc-shaped groove is provided on the synchronization frame, and a slider is slidably installed on the arc-shaped groove. The top of the slider is connected to a top rod. An arc-shaped rod is installed inside the arc-shaped groove, and the arc-shaped rod and the slider move through each other. A limit spring is sleeved on the outer wall of the arc-shaped rod. One end of the limit spring is engaged with the side wall of the arc-shaped groove, and the other end of the limit spring is engaged with the side wall of the slider.

[0018] In a preferred embodiment of the present invention, ball bearings are respectively installed at both ends of the top rod, and the ball bearings correspond to the inclined surfaces of the bottom of the pressure plate and the guide block. A guide rod is installed on the side wall of the top rod, and the end of the guide rod is slidably disposed in the displacement groove. An inclined surface is provided at the bottom of the first slot.

[0019] In a preferred embodiment of the present invention, the tapping assembly includes an adjustable electric push rod, a bracket is mounted on the output end of the adjustable electric push rod, a tapping motor is mounted on the bracket, and a tap is mounted on the output end of the tapping motor.

[0020] A precision machining process for the combined cylinder block of a chiller compressor includes the following steps:

[0021] Step 1: Place the compressor cylinder block workpiece to be processed into the three-jaw chuck, and use the three-jaw chuck to center and clamp the workpiece. In the initial state, the sliding seat stops at the precision milling station. At the same time, connect the high-pressure gas delivery system to prepare for the subsequent air blowing and cleaning in the hole.

[0022] Step 2: Start the precision milling assembly in the precision milling station to perform precision milling cutting on the end face of the workpiece and the through hole to be tapped. After the machining is completed, turn off the precision milling assembly. The electric slide rail drives the slide to move smoothly laterally and transfer the precision-milled workpiece to the cleaning station.

[0023] Step 3: The electric push rod drives the base to move slightly, completing the precise alignment of the connecting pipe and the workpiece through hole axis; then the electric push rod drives the base to move upward at a constant speed, and the nozzle penetrates the entire through hole from the bottom until it completely exceeds the upper end face of the through hole; at the same time, the drive motor drives the connecting pipe and the nozzle to rotate circumferentially, and the high-pressure airflow passes through the input pipe and the connecting pipe and is finally sprayed out by the nozzle; during the upward stroke, the pressure plate squeezes the top rod, and the guide rod moves down along the inclined surface of the first slot to switch the slot, and the nozzle tilt angle matches the downward direction, which is convenient for later reset and cleaning;

[0024] Step 4: After the chip removal is completed, the electric push rod moves the base down and resets, and the electric slide rail moves the workpiece to the tapping station again; the electric push rod is adjusted to push the support longitudinally, and the tapping motor drives the tap to rotate and feed, completing the thread tapping of the clean and chip-free through hole. During the processing, the workpiece angle can be finely adjusted by the shift motor to ensure the coaxiality and accuracy of the tapping.

[0025] Step 5: Workpiece unloading and resetting: After all tapping processes are completed, all actuators at each station are reset, the slide returns to its initial loading position, the three-jaw chuck is released to remove the finished workpiece, and the next round of workpiece finishing cycle can begin.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] This invention features a nozzle that can rotate circumferentially and automatically adjusts its spray angle with the lifting stroke. During operation, the nozzle moves upward at a constant speed along the axis of the through hole, following the base, completely penetrating the entire through hole of the workpiece. Simultaneously, it maintains continuous airflow while rotating. Relying on a mechanical linkage structure consisting of a pressure plate, guide block, and push rod, the nozzle's spray angle automatically adapts to its upward and return movement directions, adjusting the tilt angle synchronously with the entire stroke. Overall, this structure can comprehensively cover the entire area of ​​the through hole wall and bottom, leaving no blind spots. It can efficiently and thoroughly remove the mixture of iron filings and cutting fluid adhering to the hole, reducing machining debris residue inside the through hole and providing a clean, impurity-free machining hole for subsequent tapping processes.

[0028] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0029] In the attached diagram:

[0030] Figure 1 A 3D drawing of a precision machining fixture for a compressor cylinder block of a chiller unit;

[0031] Figure 2 A top view of a combined precision machining fixture for a chiller unit compressor cylinder block;

[0032] Figure 3 A bottom view of the slide of a combined precision machining tooling for a water chiller compressor cylinder block;

[0033] Figure 4 A 3D drawing of a tapping assembly for a combined precision machining tooling for a chiller compressor cylinder block;

[0034] Figure 5 A 3D view of the cleaning station of a combined precision machining tooling for a chiller compressor cylinder block;

[0035] Figure 6A precision machining fixture for a chiller compressor cylinder block assembly. Figure 5 Partial view;

[0036] Figure 7 This is a sectional view of the base of a precision machining fixture for a chiller compressor cylinder block.

[0037] Figure 8 A partial precision machining fixture for a chiller unit compressor cylinder block Figure 1 ;

[0038] Figure 9 A partial precision machining fixture for a chiller unit compressor cylinder block Figure 2 ;

[0039] Figure 10 A precision machining fixture for a chiller compressor cylinder block assembly. Figure 9 Enlarged view of point A in the middle;

[0040] Figure 11 This is a partial plan view of a precision machining fixture for a compressor cylinder block of a chiller unit.

[0041] In the diagram: 1. Machine tool body; 2. Electric slide rail; 3. Slide base; 4. Three-jaw chuck; 5. Workpiece; 6. Positioning motor; 7. Precision milling assembly; 8. Adjustable electric push rod; 9. Support; 10. Tap; 11. Tapping motor; 12. Shifting electric push rod; 13. Connecting frame; 14. Base; 15. Connecting pipe; 16. Drive motor; 17. Transmission shaft; 18. Notch; 19. Sealing cover; 20. Input pipe; 21. Hose; 22. Sprayer 23. Head; 24. Positioning seat; 25. Rocker arm; 26. Strip groove; 27. Slide rod; 28. Synchronizing frame; 29. ​​Insert rod; 30. Socket; 31. Compression spring; 32. Top rod; 33. Ball bearing; 34. Arc groove; 35. Arc rod; 36. Slider; 37. Limiting spring; 38. Guide rod; 39. Adjusting block; 40. Displacement groove; 41. First slot; 42. Inclined surface; 43. Second slot; 44. Guide block; 45. Pressure plate. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0043] Example 1:

[0044] like Figures 1 to 11 As shown, a combined precision machining fixture for the cylinder block of a chiller unit compressor includes a machine tool body 1, on which a precision milling station, a cleaning station and a tapping station are respectively provided;

[0045] A slide block 3 is slidably mounted on the machine tool body 1, and the slide block 3 holds the workpiece 5.

[0046] The precision milling station is equipped with precision milling components 7;

[0047] A base 14 is vertically and slidably installed on the cleaning station. A connecting pipe 15 is rotatably installed on the base 14 and is connected to an external air pipe. A nozzle 22 is rotatably installed on the side wall of the connecting pipe 15 and communicates with it. The nozzle 22 is in an inclined state and corresponds to the side wall of the through hole of the workpiece 5. A rocker arm 24 is installed at the rotation center of the nozzle 22. A synchronous frame 27 is slidably installed on the rocker arm 24 and a push rod 31 is slidably installed on the synchronous frame 27. A compression spring 30 is installed between the push rod 31 and the synchronous frame 27. An adjusting block 38 is installed on the top of the connecting pipe 15 and a displacement groove 39 is opened on the adjusting block 38 and is slidably connected to the push rod 31. A first slot 40 and a second slot 42 are opened in sequence on the side wall of the displacement groove 39. A guide block 43 is installed on the base 14 and is triangular. A pressure plate 44 is installed on the machine tool body 1. The pressure plate 44 and the guide block 43 are used to adjust the angle of the nozzle 22 during the outward and return strokes.

[0048] Tapping components are installed on the tapping station.

[0049] like Figures 1 to 11 As shown, in a specific embodiment, an electric slide rail 2 is installed on the machine tool body 1, a slide block 3 is installed on the electric slide rail 2, a shift motor 6 is installed at the bottom of the slide block 3, the output shaft of the shift motor 6 moves through the slide block 3, and a three-jaw chuck 4 is installed at the end of the output shaft of the shift motor 6, holding the workpiece 5 in the three-jaw chuck 4. The electric slide rail 2 realizes automatic workpiece transfer at the workstation, and the shift motor 6 and the three-jaw chuck 4 realize the centering and clamping of the workpiece and the fine adjustment of the circumferential angle, avoiding the positioning deviation caused by manual clamping and improving the overall machining coaxiality.

[0050] Example 2:

[0051] The difference between the above embodiments and this embodiment is that: Figures 1 to 11 As shown, a shifting electric push rod 12 is installed on the cleaning station of the machine tool body 1. A connecting frame 13 is installed at the output end of the shifting electric push rod 12. The side wall of the connecting frame 13 is connected to the base 14. A drive motor 16 is installed at the bottom of the base 14. A transmission shaft 17 is installed at the output end of the drive motor 16, and the transmission shaft 17 moves through the base 14. The end of the output end of the transmission shaft 17 is connected to the bottom of the connecting pipe 15. The shifting electric push rod 12 enables precise vertical lifting and feeding of the base 14. The drive motor 16, in conjunction with the transmission shaft 17, drives the connecting pipe 15 to rotate at a uniform speed, ensuring that the lifting stroke and rotation speed of the nozzle 22 are controllable, adapting to the chip cleaning needs of through holes of different depths.

[0052] like Figures 1 to 11As shown, in a specific embodiment, a sealing cover 19 is installed on the base 14. The sealing cover 19 is rotatably connected to the connecting pipe 15. A notch 18 is provided on the connecting pipe 15, and the notch 18 communicates with the sealing cover 19. An input pipe 20 is installed on the side wall of the sealing cover 19, and the input pipe 20 communicates with the high-pressure gas delivery system. A hose 21 is installed at the end of the nozzle 22, and the hose 21 communicates with the connecting pipe 15. The top of the sealing cover 19 is connected to the guide block 43, and the guide block 43 is in an inclined state. The sealing cover 19, together with the notch 18 and the hose 21, forms a sealed air passage to prevent high-pressure gas leakage and ensure stable air pressure at the nozzle 22. At the same time, the sealing cover 19 integrates the guide block 43, reducing component installation errors.

[0053] like Figures 1 to 11 As shown, a positioning seat 23 is further installed on the outer wall of the connecting pipe 15. The nozzle 22 is rotatably connected to the positioning seat 23. A strip groove 25 is provided on the rocker arm 24, and a sliding rod 26 is slidably installed on the strip groove 25. The two ends of the sliding rod 26 are connected to the synchronization frame 27. The strip groove 25 and the sliding rod 26 form a sliding pair to accommodate the displacement deviation during the swing of the rocker arm 24, ensuring that the movement of the synchronization frame 27 can be smoothly transmitted to the nozzle 22.

[0054] like Figures 1 to 11 As shown, a connecting rod 28 is movably mounted through the synchronous frame 27. Sockets 29 are mounted at both ends of the connecting rod 28. The sidewalls of the sockets 29 are mounted on the sidewalls of the connecting pipe 15. A compression spring 30 is sleeved on the outer sidewall of the connecting rod 28. One end of the compression spring 30 is engaged with the sidewall of the synchronous frame 27, and the other end is engaged with the socket 29. The compression spring 30 drives the synchronous frame 27 with an upward force. The compression spring 30 continuously provides an upward preload.

[0055] like Figures 1 to 11 As shown, further, an arc-shaped groove 33 is provided on the synchronous frame 27, and a slider 35 is slidably installed on the arc-shaped groove 33. The top of the slider 35 is connected to the top rod 31. An arc-shaped rod 34 is installed inside the arc-shaped groove 33, and the arc-shaped rod 34 and the slider 35 are movably connected through each other. A limit spring 36 is sleeved on the outer wall of the arc-shaped rod 34. One end of the limit spring 36 is engaged with the side wall of the arc-shaped groove 33, and the other end of the limit spring 36 is engaged with the side wall of the slider 35.

[0056] like Figures 1 to 11As shown, furthermore, ball bearings 32 are installed at both ends of the push rod 31, and the ball bearings 32 correspond to the inclined surfaces of the bottom of the pressure plate 44 and the guide block 43. A guide rod 37 is installed on the side wall of the push rod 31, and the end of the guide rod 37 is slidably disposed in the shifting groove 39. An inclined surface 41 is provided at the bottom of the first slot 40. The ball bearings 32 change the sliding friction to rolling friction, reducing the movement resistance of the push rod 31. The inclined surface 41 at the bottom of the first slot 40 enables the guide rod 37 to slide smoothly to change slots, making the slot switching action smoother.

[0057] Example 3:

[0058] The difference between the above embodiments and this embodiment is that: Figures 1 to 11 As shown, the tapping assembly includes an adjustable electric actuator 8, a bracket 9 mounted on the output end of the adjustable electric actuator 8, a tapping motor 11 mounted on the bracket 9, and a tap 10 mounted on the output end of the tapping motor 11. It adopts a structure of direct feed via the electric actuator and direct drive of the tap 10 by the motor, allowing for precise control of the feed rate and speed. It matches clean through holes to complete high-precision thread machining, and features a simple structure and convenient maintenance.

[0059] This invention also discloses a precision machining process for the combined cylinder block of a chiller unit compressor, the steps of which are as follows:

[0060] Step 1: Place the compressor cylinder workpiece 5 to be processed into the three-jaw chuck 4. The three-jaw chuck 4 is used to center and clamp the workpiece 5. In the initial state, the sliding seat 3 stops at the precision milling station. At the same time, the high-pressure gas delivery system is connected to prepare for the subsequent air blowing and cleaning in the hole.

[0061] Step 2: Start the precision milling assembly 7 in the precision milling station to perform precision milling cutting on the end face of the workpiece 5 and the through hole to be tapped. After the machining is completed, turn off the precision milling assembly 7. The electric slide rail 2 drives the slide block 3 to move smoothly laterally and transfer the precision milled workpiece 5 to the cleaning station.

[0062] Step 3: The electric push rod 12 drives the base 14 to move slightly, completing the precise alignment of the connecting pipe 15 with the axis of the through hole of the workpiece 5; then the electric push rod 12 drives the base 14 to move upward at a constant speed, and the nozzle 22 penetrates the entire through hole from the lower end of the through hole until it completely exceeds the upper end face of the through hole; at the same time, the drive motor 16 drives the connecting pipe 15 and the nozzle 22 to rotate circumferentially, and the high-pressure airflow passes through the input pipe 20 and the connecting pipe 15 and is finally sprayed out by the nozzle 22; during the upward journey, the pressure plate 44 squeezes the top rod 31, and the guide rod 37 moves down along the inclined surface 41 of the first slot 40 to switch slots, and the tilt angle of the nozzle 22 matches the downward direction, which is convenient for later reset and cleaning;

[0063] Step 4: After the chip removal is completed, the electric push rod 12 moves the base 14 down to reset, and the electric slide rail 2 moves the workpiece 5 to the tapping station again; the electric push rod 8 is adjusted to push the bracket 9 to feed longitudinally, and the tapping motor 11 drives the tap 10 to rotate and feed, completing the thread tapping of the clean and chip-free through hole. During the processing, the workpiece angle can be finely adjusted by the shift motor 6 to ensure the coaxiality and accuracy of the tapping.

[0064] Step 5: Workpiece unloading and resetting: After all tapping processes are completed, all actuators at each station are reset, slide 3 returns to its initial loading position, and the three-jaw chuck 4 is released to remove the finished workpiece 5, so that the next round of workpiece finishing cycle can begin.

[0065] The implementation principle of the combined precision machining fixture for the compressor cylinder of a chiller unit according to the present invention is as follows:

[0066] In actual operation, the compressor cylinder block workpiece 5 is continuously precision machined using the milling, cleaning, and tapping stations divided within the machine tool body 1. The entire process relies on the electric slide rail 2 (model KM45-1000) to drive the slide block 3, automatically changing the workpiece 5's position. The electric slide rail 2 is a mature, readily available linear transmission technology, requiring no additional structural modifications. Initially, the operator clamps the compressor cylinder block workpiece 5 inside the three-jaw chuck 4. The three-jaw chuck 4 moves synchronously with the slide block 3. The shifting motor 6 rotates the three-jaw chuck 4 and the clamped workpiece 5 as a whole, meeting the needs for adjusting the posture at different machining angles. Initially, the slide block 3 is located in the milling station. The end face and hole positions of the workpiece 5 are milled using the vertical milling assembly 7 (model XM-80). The milling assembly 7 also uses commercially available CNC milling equipment, representing readily available, externally sourced technology.

[0067] After the workpiece 5 completes the precision milling process, the electric slide rail 2 drives the slide block 3 to move smoothly to the cleaning station. First, the alignment and calibration of the nozzle 22 with the through hole of the workpiece 5 is completed. The shifting electric push rod 12 first drives the connecting frame 13 and the base 14 to move slightly, so that the axis of the connecting pipe 15 is precisely aligned with the axis of the through hole of the workpiece 5, ensuring that the subsequent air blowing cleaning position is not offset. After the alignment is completed, the shifting electric push rod 12 drives the base 14 to slide vertically upward as a whole. The driving base 14 drives the nozzle 22 to move upward gradually along the axis of the through hole of the workpiece 5. The nozzle 22 gradually penetrates the entire through hole from the lower end of the through hole until the nozzle 22 completely exceeds the upper end face of the through hole of the workpiece 5.

[0068] Meanwhile, the drive motor 16 installed at the bottom of the base 14 drives the transmission shaft 17 to rotate synchronously. The transmission shaft 17 further drives the connecting pipe 15 to rotate uniformly in the circumferential direction above the base 14, causing the nozzle 22 to rotate synchronously around the center of the through hole. The external high-pressure gas delivery system continuously introduces high-pressure cleaning gas into the sealing cover 19 through the input pipe 20. The high-pressure gas enters the connecting pipe 15 through the notch 18 opened on the side wall of the connecting pipe 15, and is then delivered to the inclined nozzle 22 through the hose 21. Finally, the rotating nozzle 22 continuously sprays high-pressure airflow toward the side wall of the through hole of the workpiece 5, flushing the hole wall in all directions and thoroughly blowing away the iron filings, cutting fluid residues and other impurities remaining on the inner wall of the through hole after precision milling.

[0069] When the connecting pipe 15 moves upward with the base 14 to the top of the through hole of the workpiece 5, the ball 32 at the top of the push rod 31 is pressed hard against the bottom surface of the pressure plate 44. The pressure plate 44 applies downward pressure to the push rod 31, forcing the push rod 31 to move downward as a whole. During the downward movement of the push rod 31, the guide rod 37 on its side slides along the inclined surface 41 at the bottom of the first slot 40, and slides along the inclined surface 41 to the bottom of the displacement slot 39. During this process, the synchronous frame 27 moves downward synchronously with the push rod 31. The synchronous frame 27 compresses the inner limiting spring 36 to cause it to deform, completing the downward storage. Force; As the connecting pipe 15 continues to rotate circumferentially, the guide rod 37 slides to the corresponding position of the second slot 42. The compressed limit spring 36 releases the elastic reset force, pushing the guide rod 37 into the second slot 42 to complete precise positioning. The synchronous frame 27 remains in a downward state, thereby driving the rocker arm 24 to swing, so that the nozzle 22 changes its tilt angle synchronously, preparing for the angle when the nozzle 22 resets (i.e., during the return stroke). Generally, when the nozzle 22 moves upward, the nozzle 22 outlet is tilted upward, and when the nozzle 22 moves downward, the nozzle 22 outlet is tilted downward.

[0070] When the tooling finishes cleaning the top of the through hole, and the connecting pipe 15 returns to its original position as the base 14 moves downwards, the blowing angle of the nozzle 22 also adapts synchronously with the downward movement direction, keeping the angle and movement direction in the same direction. Until the bottom ball 32 of the push rod 31 contacts the inclined slope of the triangular guide block 43, the slope of the guide block 43 presses against the push rod 31, causing the guide rod 37 to disengage from the second slot 42 and unlock. At this time, the compression spring 30 sleeved on the outside of the insert rod 28 releases the upward elastic thrust, pushing the synchronous frame 27 and the push rod 31 to return to their original position. The entire linkage structure returns to its initial working position, waiting for the next round of cleaning operations.

[0071] After the cleaning operation inside the through hole of workpiece 5 is completed, the electric push rod 12 moves the base 14 down and resets, and the nozzle 22 is removed from the processing area of ​​workpiece 5. Then the electric slide rail 2 drives the slide block 3 to move workpiece 5 to the tapping station.

[0072] The electric push rod 8 at the tapping station pushes the bracket 9 longitudinally, driving the tapping motor 11 and the tap 10 to move down synchronously. The output shaft of the tapping motor 11 drives the tap 10 to rotate, completing the thread tapping process in conjunction with the preset hole position of the workpiece 5. The shifting motor 6 can finely adjust the circumferential angle of the workpiece 5 according to the tapping process requirements to ensure tapping accuracy. The entire tooling completes the three processes of precision milling, high-pressure cleaning inside the hole, and tapping in sequence, realizing the integrated precision machining of the compressor cylinder body. This avoids the positioning error caused by the secondary clamping of the workpiece during the process transfer. At the same time, the swingable rotating nozzle eliminates the dead corners of the through hole cleaning, comprehensively improving the overall machining quality of the compressor cylinder body.

[0073] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precision machining fixture for a chiller compressor cylinder block, comprising a machine tool body (1), characterized in that, The machine tool body (1) is respectively provided with a fine milling station, a cleaning station and a tapping station; A slide block (3) is slidably mounted on the machine tool body (1), and the slide block (3) holds the workpiece (5). The precision milling station is equipped with a precision milling component (7); A base (14) is vertically slidably installed on the cleaning station. A connecting pipe (15) is rotatably installed on the base (14). The connecting pipe (15) is connected to an external air pipe. A nozzle (22) is rotatably installed on the side wall of the connecting pipe (15) and communicates with it. The nozzle (22) is in an inclined state and corresponds to the side wall of the through hole of the workpiece (5). A rocker arm (24) is installed at the rotation center of the nozzle (22). A synchronous frame (27) is slidably installed on the rocker arm (24), and a push rod (31) is slidably installed on the synchronous frame (27). The push rod (31) is connected to the synchronous frame (27). Compression springs (30) are installed between the step frames (27). An adjusting block (38) is installed on the top of the connecting pipe (15). A shifting groove (39) that is slidably connected to the top rod (31) is opened on the adjusting block (38). A first slot (40) and a second slot (42) are opened in sequence on the side wall of the shifting groove (39). A guide block (43) is installed on the base (14). The guide block (43) is triangular. A pressure plate (44) is installed on the machine tool body (1). The pressure plate (44) and the guide block (43) are used to adjust the angle of the nozzle (22) for the outward and return strokes. The tapping station is equipped with a tapping assembly.

2. The combined precision machining fixture for the compressor cylinder of a chiller unit according to claim 1, characterized in that, An electric slide rail (2) is installed on the machine tool body (1), a slide block (3) is installed on the electric slide rail (2), a shift motor (6) is installed at the bottom of the slide block (3), the output shaft of the shift motor (6) moves through the slide block (3), and a three-jaw chuck (4) is installed at the end of the output shaft of the shift motor (6), and a workpiece (5) is held on the three-jaw chuck (4).

3. The combined precision machining fixture for the compressor cylinder of a chiller unit according to claim 1, characterized in that, A displacement electric push rod (12) is installed on the cleaning station of the machine tool body (1). A connecting frame (13) is installed at the output end of the displacement electric push rod (12). The side wall of the connecting frame (13) is connected to the base (14). A drive motor (16) is installed at the bottom of the base (14). A transmission shaft (17) is installed at the output end of the drive motor (16). The transmission shaft (17) moves through the base (14). The end of the output end of the transmission shaft (17) is connected to the bottom of the connecting pipe (15).

4. The combined precision machining fixture for the compressor cylinder of a chiller unit according to claim 1, characterized in that, A sealing cover (19) is installed on the base (14). The sealing cover (19) is rotatably connected to the connecting pipe (15). A notch (18) is opened on the connecting pipe (15), and the notch (18) is connected to the sealing cover (19). An input pipe (20) is installed on the side wall of the sealing cover (19), and the input pipe (20) is connected to the high-pressure gas delivery system. A hose (21) is installed at the end of the nozzle (22), and the hose (21) is connected to the connecting pipe (15). The top of the sealing cover (19) is connected to the guide block (43), and the guide block (43) is in an inclined state.

5. The combined precision machining fixture for the compressor cylinder of a chiller unit according to claim 1, characterized in that, A positioning seat (23) is installed on the outer wall of the connecting pipe (15). The nozzle (22) is rotatably connected to the positioning seat (23). A strip groove (25) is provided on the rocker arm (24). A slide rod (26) is slidably installed on the strip groove (25). Both ends of the slide rod (26) are connected to the synchronous frame (27).

6. The combined precision machining fixture for the compressor cylinder of a chiller unit according to claim 1, characterized in that, A plug rod (28) is movably installed through the synchronous frame (27). Sockets (29) are installed at both ends of the plug rod (28). The side wall of the socket (29) is installed on the side wall of the connecting pipe (15). A compression spring (30) is sleeved on the outer side wall of the plug rod (28). One end of the compression spring (30) is snapped into the side wall of the synchronous frame (27), and the other end of the compression spring (30) is snapped into the socket (29). The compression spring (30) is used to drive the synchronous frame (27) to have an upward force.

7. The combined precision machining fixture for the compressor cylinder of a chiller unit according to claim 1, characterized in that, The synchronous frame (27) has an arc-shaped groove (33) and a slider (35) is slidably installed on the arc-shaped groove (33). The top of the slider (35) is connected to the top rod (31). An arc-shaped rod (34) is installed inside the arc-shaped groove (33) and the arc-shaped rod (34) and the slider (35) pass through each other. A limit spring (36) is sleeved on the outer wall of the arc-shaped rod (34). One end of the limit spring (36) is engaged with the side wall of the arc-shaped groove (33) and the other end of the limit spring (36) is engaged with the side wall of the slider (35).

8. The combined precision machining fixture for the compressor cylinder of a chiller unit according to claim 1, characterized in that, The top rod (31) is equipped with ball bearings (32) at both ends, and the ball bearings (32) correspond to the bottom of the pressure plate (44) and the inclined surface of the guide block (43). The top rod (31) is equipped with a guide rod (37) on its side wall. The end of the guide rod (37) is slidably disposed in the displacement groove (39). The bottom of the first slot (40) is provided with an inclined surface (41).

9. The combined precision machining fixture for the compressor cylinder of a chiller unit according to claim 1, characterized in that, The tapping assembly includes an adjustable electric push rod (8), a bracket (9) is mounted on the output end of the adjustable electric push rod (8), a tapping motor (11) is mounted on the bracket (9), and a tap (10) is mounted on the output end of the tapping motor (11).

10. A precision machining process for the combined cylinder block of a chiller unit compressor, characterized in that, The chiller compressor cylinder block assembly precision machining fixture according to any one of claims 1 to 9, the chiller compressor cylinder block assembly precision machining process comprises the following steps: Step 1: Place the compressor cylinder workpiece (5) to be processed inside the three-jaw chuck (4), and use the three-jaw chuck (4) to center and clamp the workpiece (5). In the initial state, the sliding seat (3) stops at the precision milling station. At the same time, the high-pressure gas delivery system is connected to prepare for the subsequent air blowing and cleaning in the hole. Step 2: Start the precision milling assembly (7) of the precision milling station to perform precision milling cutting on the end face of the workpiece (5) and the through hole to be tapped. After the machining is completed, turn off the precision milling assembly (7), and the electric slide rail (2) drives the slide block (3) to move smoothly laterally to transfer the precision milled workpiece (5) to the cleaning station. Step 3: The shifting electric push rod (12) drives the base (14) to move slightly, completing the precise alignment of the connecting pipe (15) and the through hole axis of the workpiece (5); then the shifting electric push rod (12) drives the base (14) to move upward at a constant speed, and the nozzle (22) passes through the entire through hole from the lower end of the through hole until it completely exceeds the upper end face of the through hole; at the same time, the drive motor (16) drives the connecting pipe (15) and the nozzle (22) to rotate circumferentially, and the high-pressure airflow passes through the input pipe (20) and the connecting pipe (15) and is finally sprayed out by the nozzle (22); when moving upward, the pressure plate (44) squeezes the top rod (31), and the guide rod (37) moves down along the inclined surface (41) of the first slot (40) to switch slots, and the nozzle (22) tilts to match the downward direction, which is convenient for later reset and cleaning; Step 4: After the chip removal is completed, the electric push rod (12) moves the base (14) down to reset, and the electric slide rail (2) moves the workpiece (5) to the tapping station again; the electric push rod (8) is adjusted to push the bracket (9) to feed longitudinally, and the tapping motor (11) drives the tap (10) to rotate and feed, and the thread tapping is completed on the clean and chip-free through hole. During the processing, the workpiece angle can be finely adjusted by the shift motor (6) to ensure the coaxiality and accuracy of the tapping. Step 5: Workpiece unloading and reset: After the tapping process is completed, all the actuators at each station are reset, the slide (3) returns to the initial loading position, the three-jaw chuck (4) is released and the finished workpiece (5) is removed, and the next round of workpiece finishing cycle can begin.

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