Turbine shaft clamping method and turning tool

Abstract

The invention discloses a turbine shaft clamping method and a turning tool. The turbine shaft clamping method and the turning tool are good in re-calibration precision, short in preparation time, low in operation difficulty and low in machining cost, and the run-out value of a threaded section of a part meets the requirement. Comprising a tip and a lantern ring, the tip is provided with a cylindrical section and a conical section, the cylindrical section of the tip is used for clamping a hard three-jaw of machining equipment, the conical section of the tip is used for jacking a turbine end center hole of a turbine shaft, the lantern ring is used for being sleeved on an outer circle of the turbine end of the turbine shaft to be fixed, and a clamping structure is arranged on the lantern ring. And the lantern ring is clamped with a hard three-jaw of the processing equipment through the clamping structure, so that the hard three-jaw of the processing equipment can drive the turbine shaft to rotate through the lantern ring.

Description

Technical Field

[0001] The invention relates to the technical field of supercharger manufacturing, and in particular to a turbine shaft clamping method and a turning tool. Background Art

[0002] In recent years, my country's shipbuilding industry has developed rapidly. As an important component of the marine diesel engine, the main power unit of the ship, the technical level of the supercharger directly affects the working efficiency of the marine diesel engine. The turbine shaft is the core backbone part of the supercharger, which connects the assembly relationship of the entire supercharger parts in series. Therefore, in order to ensure the assembly quality of the supercharger, the dimensional control and form and position tolerance control of the outer circle of each positioning gear and the thread gear on the turbine shaft are particularly important.

[0003] Recently, when processing the threaded gear of the JTH150 turbine shaft, a special soft three-jaw clamp was used to clamp the outer circle, set up a center frame, push the center hole, and re-calibrate the outer circle runout at the center frame to no more than 0.01. The outer circle runout of the processed threaded gear was out of tolerance and did not meet the runout requirement of 0.01 for the outer circle of the positioning gear. It did not meet the requirements of the drawing and would also affect the runout of parts in the subsequent rotor assembly. In addition, the use of special soft three-jaws increased the processing cost (the soft three-jaws need to polish the inner hole of the clamping circle each time they are used to ensure coaxiality with the equipment. They are consumables and new special soft three-jaws will be manufactured from time to time). The operation of re-calibrating the outer circle runout of the center frame to no more than 0.01 is also difficult, and it will take a lot of time to repeatedly correct, clamp and re-calibrate, reducing production efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a turbine shaft clamping method and turning tool with good recalibration accuracy, short preparation time, low operating difficulty, low processing cost, and the runout value of the threaded section of the part meets the requirements.

[0005] The object of the present invention is achieved in that: A turbine shaft turning tool comprises a top and a collar, wherein the top has a cylindrical section and a conical section, the cylindrical section of the top is clamped by a hard three-jaw of a processing device, and the conical section of the top is used to press the center hole of the turbine end of the turbine shaft, and the collar is used to be sleeved on the outer circle of the turbine end of the turbine shaft and fixed, and a clamping structure is provided on the collar, and the collar is clamped with the hard three-jaw of the processing device through the clamping structure, so that the hard three-jaw of the processing device can drive the turbine shaft to rotate through the collar.

[0006] Preferably, a copper sheet is placed between the collar and the outer circle of the turbine end of the turbine shaft.

[0007] Preferably, a threaded through hole is radially arranged on the outer circle of the collar, and a set screw is matched with the inner thread of the radial threaded through hole, and the set screw fixes the collar on the turbine shaft.

[0008] Preferably, a threaded through hole is axially provided on the end face of the collar, the clamping structure is a clamping bolt, the clamping bolt thread is fitted in the axial threaded through hole, and the end of the clamping bolt is positioned against the hard three-claw side of the processing equipment.

[0009] A method for clamping a turbine shaft of a turbine shaft turning tool, Clean the top, the center holes at both ends of the turbine shaft and the tailstock ejector pins of the processing equipment; The processing equipment clamps the cylindrical section of the top with hard three-jaws and detects the outer circle runout of the cone surface of the top cone section to ensure that the runout is within 0.003mm. If the runout is out of tolerance, the outer circle of the cone surface of the top cone section is polished to meet the requirements. Put the collar on the outer circle of the turbine end of the turbine shaft and fix it with the set screw, and screw the clamping bolt into the axial threaded through hole of the collar; Place the turbine shaft into the processing equipment, set up the center stand, push the top cone section against the center hole of the turbine end of the turbine shaft, push the tailstock ejector of the processing equipment against the center hole of the shaft end of the turbine shaft, remove the center stand, rotate the turbine shaft and adjust the position of the clamping bolt so that the end of the clamping bolt is positioned against the side of the hard three-claw of the processing equipment; Re-measure the runout of the two positioning gears on the turbine shaft to ensure that the runout value is within 0.006mm; Process the outer circle and external thread of the turbine shaft to the required size, ensuring that the outer circle runout is within 0.008mm.

[0010] Preferably, the clamping bolt is positioned against the hard three-jaw side of the processing device against the rotation direction of the chuck.

[0011] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: ① The recalibration accuracy is better, and can reach 0.006mm runout (previously, it took repeated alignment and adjustment to find 0.01mm runout); ② The time for parts clamping is shorter and simpler, and the runout requirement of less than 0.01mm can be met without recalibration (previously, it was necessary to produce a special soft three-jaw, then clamp the parts to check the runout, and repeatedly align and adjust the clamping); ③ The operation is easier, and novices can perform clamping and processing (in the past, the adjustment and clamping of parts had to be within 0.01mm, which many novices could not complete and had to rely on experienced workers to operate); ④ The processing cost is lower. You only need to prepare a top, a ring, a screw and a bolt. Except for the top, the rest are not easy to wear out (previously, it was necessary to make special soft three-jaws, which was costly and easy to wear out, and new special soft three-jaws needed to be made from time to time); ⑤ The runout value of the threaded section of the part easily meets the requirements, and the runout is generally between 0.006mm-0.008mm (the previously measured runout was between 0.01mm-0.02mm). BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 The schematic diagram of the top structure; Figure 3 It is a schematic diagram of the structure of the ring.

[0013] Reference numerals In the accompanying drawings, 1 is the tip, 2 is the bolt, 3 is the collar, and 4 is the screw. DETAILED DESCRIPTION

[0014] The specific operation steps of the embodiment of the present invention are described in detail below. Figure 1 The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0015] The present invention provides a clamping method and a turning tool for machining threads and outer circles of turbine shafts. The tool is named a turbine shaft turning tool. The assembly relationship is shown in the attached figure. The part is clamped with double centers, and the collar is fixed on the part to ensure that the part rotates with the hard three-jaw. The specific operation steps are as follows: ① Clean the top 1 in the turbine shaft turning tool, the center holes at both ends of the part and the top of the tailstock, then clamp the top 1 with the hard three-jaw device, and check the outer circle runout of the cone. If the runout is within 0.003mm, you can proceed to the next step. If the runout is out of tolerance, just checking the outer circle of the cone surface of the top can meet the requirements.

[0016] ②Put the collar 3 on the small outer circle of the turbine end of the turbine shaft, screw the screw 4 into the outer circle threaded hole of the collar 3, tighten the screw to ensure that the collar is fixed on the turbine shaft. Note that the copper sheet should be padded in advance at the tight point between the screw and the outer circle of the small end of the turbine shaft. Then screw the bolt 2 into the end face threaded hole of the collar 3 until it just passes through the other side end face.

[0017] ③ Place the turbine shaft into the equipment, set up the center stand, tighten it with two tops (top 1 at the turbine end, and the tailstock at the shaft end), remove the center stand, rotate the turbine shaft to adjust the position of bolt 2, and ensure that bolt 2 is flat against the side of the hard three-jaw in the opposite direction of rotation.

[0018] ④ Remeasure the runout of the two positioning gears on the turbine shaft, and the runout value is 0.006mm.

[0019] ⑤Process the outer circle and external thread of the turbine shaft to the required size, with an outer circle runout of 0.008mm.

[0020] The present invention adopts a new clamping method and turning tool, and adopts the form of double-center clamping, which can well ensure the runout requirements of the outer circle and thread segment of each gear of the part. A center is required. Before each use, the outer circle runout of the cone surface of the top is detected. If the runout is not good, the cone surface is exposed, and then the center hole of the turbine end of the turbine shaft is pushed, and the tail seat of the equipment pushes the center hole of the turbine shaft end. In order to fix the part and make it rotate with the chuck so that it can be processed, a fixing tool with a circular ring shape is provided, named a sleeve ring, and a threaded through hole is provided on the outer circle of the sleeve ring. The sleeve ring is sleeved on the small end of the turbine of the turbine shaft. The threaded hole on the outer circle of the sleeve ring is tightened with a screw (copper pad is used to contact the outer circle of the small end of the turbine end) to fix the sleeve ring on the part, and then a threaded through hole is provided on the end face of the sleeve ring, and a bolt is connected. The bolt is against the side of the hard three-jaw of the equipment in the opposite direction of the rotation of the chuck, and the hard three-jaw clamps the outer circle of the top. After clamping is completed, processing can begin.

[0021] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A turbine shaft turning tool, characterized in that: It includes a top and a collar. The top has a cylindrical section and a conical section. The cylindrical section of the top is clamped by the hard three-jaw of the processing equipment, and the conical section of the top is used to press the center hole of the turbine end of the turbine shaft. The collar is used to be fixed on the outer circle of the turbine end of the turbine shaft. The collar is provided with a clamping structure. The collar is clamped with the hard three-jaw of the processing equipment through the clamping structure, so that the hard three-jaw of the processing equipment can drive the turbine shaft to rotate through the collar.

2. A turbine shaft turning tool according to claim 1, characterized in that: Copper sheet is placed between the sleeve ring and the outer circle of the turbine end of the turbine shaft.

3. A turbine shaft turning tool according to claim 1, characterized in that: A threaded through hole is radially arranged on the outer circle of the collar, and a set screw is matched with the inner thread of the radial threaded through hole, and the set screw fixes the collar on the turbine shaft.

4. A turbine shaft turning tool according to claim 1, characterized in that: Then a threaded through hole is provided on the end face of the collar along the axial direction, and the clamping structure is a clamping bolt, the thread of the clamping bolt is fitted in the axial threaded through hole, and the end of the clamping bolt is positioned against the hard three-claw side of the processing equipment.

5. A method for clamping a turbine shaft based on the turbine shaft turning tool according to claim 1, characterized in that: Clean the top, the center holes at both ends of the turbine shaft and the tailstock ejector pins of the processing equipment; The processing equipment clamps the cylindrical section of the top with hard three-jaws and detects the outer circle runout of the cone surface of the top cone section to ensure that the runout is within 0.003mm. If the runout is out of tolerance, the outer circle of the cone surface of the top cone section is polished to meet the requirements. Put the collar on the outer circle of the turbine end of the turbine shaft and fix it with the set screw, and screw the clamping bolt into the axial threaded through hole of the collar; Place the turbine shaft into the processing equipment, set up the center stand, push the top cone section against the center hole of the turbine end of the turbine shaft, push the tailstock ejector of the processing equipment against the center hole of the shaft end of the turbine shaft, remove the center stand, rotate the turbine shaft and adjust the position of the clamping bolt so that the end of the clamping bolt is positioned against the side of the hard three-claw of the processing equipment; Re-measure the runout of the two positioning gears on the turbine shaft to ensure that the runout value is within 0.006mm; Process the outer circle and external thread of the turbine shaft to the required size, ensuring that the outer circle runout is within 0.008mm.

6. A turbine shaft clamping method according to claim 5, characterized in that: The clamping bolt is positioned against the hard three-jaw side of the processing equipment in the opposite direction of the chuck rotation.

Images