Boring method for front bearing and rear bearing of stern shaft tube

Abstract

The invention discloses a boring method for front and rear bearings of a stern shaft tube, and the method specifically comprises the following steps: S1, measuring the deflection of a tier pole, arranging temporary supports at the two ends of the tier pole to support the tier pole on a platform, and calculating the deflection value of the tier pole; s2, a row rod penetrates through the stern shaft tube to be bored through a hanging belt and a chain block, fixed bearings are installed at the two ends of the row rod correspondingly, and bearing seats are installed on the outer sides of the fixed bearings; a bearing seat bracket is mounted on the bearing seat; s3, an auxiliary hole is formed in the connecting pipe wall in the middle of the stern shaft pipe, a middle bearing is installed in the middle of the tier pole, the installation position of the middle bearing is adjusted through the auxiliary hole according to the deflection value, and the middle bearing and the tier pole are fixed through an adjusting screw; and S4, a tool rest is installed on the row rod, and boring is conducted on the stern shaft tube according to the boring requirement. The temporary auxiliary holes are formed in the corresponding positions of the stern shaft tube, and the temporary bearings are arranged in the corresponding positions to eliminate the deflection of the row rods, so that the cylindricity of boring front and rear bearing holes of the stern shaft tube is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a method for boring front and rear bearings of a stern tube. Background Art

[0002] Boring quality is crucial to the entire shafting installation. The primary factors affecting boring quality are the rigidity of the boring bar bearing mount and the deflection of the rod. Insufficient rigidity of the boring bar bearing mount will generate vibration, severely impacting stock removal and machining accuracy. Rod deflection can also affect the cylindricity of the bored hole, particularly when boring the fore and aft bearing holes of the stern tube. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and provide a method for boring the front and rear bearings of the stern tube. The device and method of the present invention place two temporary installation bearings on the inner field platform, and the installation positions of the two temporary bearings are consistent with the positions of the boring row bearings. The actual deflection of the row rod is measured, and then after the boring row is installed, a temporary process hole is opened at the corresponding position of the stern tube, and a temporary bearing is set at the corresponding position. The corresponding position of the row rod is adjusted upward and fixed to eliminate the deflection of the row rod, thereby ensuring the cylindricity of the boring holes of the front and rear bearing holes of the stern tube.

[0004] In order to achieve the above invention purpose, the technical solution provided by the present invention is as follows:

[0005] A method for boring front and rear bearings of a stern tube, the method specifically comprising the following steps:

[0006] S1, measure the deflection of the pole, set up temporary supports at both ends of the pole to support the pole on the platform, use a dial indicator to measure the height of the middle of the pole, and calculate the deflection value of the pole;

[0007] S2: Use a sling and hand chain hoist to pass the row rod through the stern tube to be bored. Install fixed bearings at both ends of the row rod and a bearing seat outside the fixed bearing. Install a bearing seat bracket on the bearing seat and weld the bearing seat bracket to the shaft hub using angle iron or channel steel.

[0008] S3: Open a process hole on the connecting pipe wall in the middle of the stern tube, install an intermediate bearing in the middle of the rod, adjust the installation position of the intermediate bearing through the process hole according to the deflection value, and fix the intermediate bearing to the rod with the adjustment screw;

[0009] S4, install the tool holder on the rod and bore the stern tube according to the boring requirements.

[0010] Furthermore, the temporary support positions at both ends of the row rod are the installation positions of the fixed bearings, the heights of the temporary supports at both ends of the row rod are the same, and the height value H1 of the row rod and the platform at the temporary support is measured. The height values of the temporary supports at both ends of the row rod are the same, and the height value H2 of the middle position of the row rod and the platform is measured. The deflection value of the middle part of the row rod is H=H1-H2.

[0011] Furthermore, the intermediate bearing includes a first bearing and a second bearing, both of which are semicircular, and fixed platforms are respectively provided at both ends of the first bearing, and fixed bolt holes are provided on the fixed platforms, and fixed bolt holes are respectively provided at both ends of the second bearing, and the fixing bolt holes on the second bearing correspond to the fixing bolt holes on the first bearing.

[0012] Furthermore, two positioning grooves are respectively provided on the first bearing and the second bearing, and the positioning grooves are evenly distributed on the first bearing and the second bearing.

[0013] Furthermore, the adjustment and fixation of the intermediate bearing on the row rod is specifically as follows: after the row rod passes through the stern tube, a process hole is opened on the side of the middle part of the stern tube, the intermediate bearing is installed on the row rod through the opened process hole, and the intermediate bearing is connected and fixed to the row rod by a fixing bolt. After the intermediate bearing is fixed, a bearing adjustment hole is opened on the corresponding side of the stern tube according to the installation position of the intermediate bearing, and four bearing adjustment holes are evenly opened on the side of the stern tube. An adjustment screw is installed in the bearing adjustment hole, and the tail of the adjustment screw is connected to the side of the intermediate bearing. The depth of the adjustment screw screwed into the stern tube is adjusted according to the measured deflection value of the middle part of the row rod, and the height of the intermediate bearing is adjusted so that the height of the middle part of the row rod is equal to the height of the two ends of the row rod.

[0014] Furthermore, the adjusting screw is connected to the bearing adjusting hole through a thread, and the tail of the adjusting screw is connected to the positioning groove on the side of the intermediate bearing by rotating the rod.

[0015] Furthermore, two tapered holes are evenly opened on the side surface of the stern tube on one side of the bearing adjustment hole, and a dial indicator is installed in the tapered hole, and the tail end of the dial indicator is connected to the side surface of the intermediate bearing.

[0016] Furthermore, the boring of the stern tube is specifically performed as follows:

[0017] S41, install the inner hole tool holder at both ends of the stern tube to bore the inner circle of the stern tube. When boring, perform rough boring first, with a cutting depth of 1-5mm. After the rough boring is completed, perform fine boring, with a cutting depth of 0.20-0.4mm.

[0018] S42, after the inner circle boring of the stern tube is completed, a flat tool holder is installed at both ends of the stern tube to bore the two ends of the stern tube. When boring, rough boring is first performed with a cutting depth of 1-5mm. After the rough boring is completed, fine boring is performed with a cutting depth of 0.20-0.4mm; the boring of the stern tube is completed.

[0019] Furthermore, during the stern tube boring process, the installed intermediate bearing is continuously lubricated.

[0020] Based on the above technical solution, the method for boring the front and rear bearings of the stern tube in the present invention has achieved the following technical advantages through practical application:

[0021] 1. A method for boring front and rear bearings of a stern tube according to the present invention comprises placing two temporary installation bearings on an inner field platform, with the installation positions of the two temporary bearings being consistent with the positions of the boring row bearings, measuring the actual deflection of the row rod, and then, after the boring row is installed, opening a temporary process hole at the corresponding position of the stern tube, setting a temporary bearing at the corresponding position, adjusting the corresponding position of the row rod upward and fixing it, eliminating the deflection of the row rod, thereby ensuring the cylindricity of the bored holes of the front and rear bearing holes of the stern tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of measuring the deflection of the rod in a method for boring the front and rear bearings of the stern tube.

[0023] Figure 2 The present invention is a schematic diagram of a boring row installation method for boring front and rear bearings of a stern tube.

[0024] Figure 3 The present invention is a front view of an intermediate bearing in a method for boring front and rear bearings of a stern tube.

[0025] Figure 4 The present invention is a side view of an intermediate bearing in a method for boring front and rear bearings of a stern tube. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0027] like Figure 1-4 As shown, a method for boring the front and rear bearings of a stern tube comprises the following steps:

[0028] S1, measure the deflection of the rod 1. Set temporary supports 2 at both ends of the rod 1 to support the rod 1 on the platform 7, and use the dial indicator 14 to measure the height of the middle of the rod 1 and calculate the deflection value of the rod 1.

[0029] S2. Use a sling and a hand chain hoist to pass the rod 1 through the stern tube to be bored. Install fixed bearings 9 at both ends of the rod 1 and a bearing seat 10 outside the fixed bearing 9. Install a bearing seat bracket 11 on the bearing seat 10 and weld the bearing seat bracket 11 to the shaft hub using angle iron or channel steel.

[0030] S3: Open a process hole 17 on the connecting pipe wall in the middle of the stern tube, install the intermediate bearing 13 in the middle of the rod 1, adjust the installation position of the intermediate bearing 13 through the process hole 17 according to the deflection value, and fix the intermediate bearing 13 to the rod 1 with the adjusting screw 16;

[0031] S4, install the tool holder on the rod 1, and bore the stern tube according to the boring requirements.

[0032] The temporary supports 2 at both ends of the row rod 1 are the installation positions of the fixed bearings 9. The heights of the temporary supports 2 at both ends of the row rod 1 are the same. The height value H1 of the row rod 1 and the platform at the temporary supports 2 is measured. The height values of the temporary supports 2 at both ends of the row rod 1 are the same. The height value H2 of the middle position of the row rod 1 and the platform is measured. The deflection value of the middle part of the row rod 1 is H=H1-H2.

[0033] By placing two temporary installation bearings on the inner field platform, the installation positions of the two temporary bearings are consistent with the positions of the boring row bearings, and measuring the actual deflection of the row rod 1, then after the boring row is installed, a temporary process hole 17 is opened at the corresponding position of the stern tube, and a temporary bearing is set at the corresponding position. The corresponding position of the row rod 1 is adjusted upward and fixed to eliminate the deflection of the row rod 1, thereby ensuring the cylindricity of the boring holes of the front and rear bearing holes of the stern tube.

[0034] The intermediate bearing 13 includes a first bearing 131 and a second bearing 132. The first bearing 131 and the second bearing 132 are both semicircular. Fixed platforms are respectively provided at both ends of the first bearing 131, and fixed bolt holes are provided on the fixed platforms. Fixed bolt holes are respectively provided at both ends of the second bearing 132. The fixing bolt holes on the second bearing 132 correspond to the fixing bolt holes on the first bearing 131.

[0035] Two positioning grooves 133 are respectively provided on the first bearing 131 and the second bearing 132 . The positioning grooves 133 are evenly distributed on the first bearing 131 and the second bearing 132 .

[0036] The adjustment and fixation of the intermediate bearing 13 on the row rod 1 is specifically as follows: after the row rod 1 passes through the stern tube, a process hole 17 is opened on the side of the middle part of the stern tube, the intermediate bearing 13 is installed on the row rod 1 through the opened process hole 17, and the intermediate bearing 13 is connected and fixed to the row rod 1 by a fixing bolt. After the intermediate bearing 13 is fixed, a bearing adjustment hole is opened on the corresponding side of the stern tube according to the installation position of the intermediate bearing 13. Four bearing adjustment holes are evenly opened on the side of the stern tube, and an adjusting screw 16 is installed in the bearing adjustment hole. The tail of the adjusting screw 16 is connected to the side of the intermediate bearing 13. The depth of the adjusting screw 16 screwed into the stern tube is adjusted according to the measured deflection value of the middle part of the row rod 1. The height of the intermediate bearing 13 is adjusted so that the height of the middle part of the row rod 1 is equal to the height of the two ends of the row rod 1.

[0037] The adjusting screw 16 is connected to the bearing adjusting hole through a thread, and the tail of the adjusting screw 16 is connected to the positioning groove 133 on the side of the intermediate bearing 13 by rotating the rod 1.

[0038] Two tapered holes are evenly opened on the side of the stern tube on one side of the bearing adjustment hole, and a dial indicator 14 is installed in the tapered hole. The tail end of the dial indicator 14 is connected to the side of the intermediate bearing 13.

[0039] The boring of the stern tube is specifically as follows:

[0040] S41, installing inner hole tool holders 18 at both ends of the stern tube to bore the inner circle of the stern tube. When boring, rough boring is first performed with a cutting depth of 1-5 mm. After the rough boring is completed, fine boring is performed with a cutting depth of 0.20-0.4 mm.

[0041] S42, after the inner circle boring of the stern tube is completed, a flat tool holder 12 is installed at both ends of the stern tube to bore the two end surfaces of the stern tube. When boring, rough boring is first performed with a cutting depth of 1-5 mm. After the rough boring is completed, fine boring is performed with a cutting depth of 0.20-0.4 mm. The boring of the stern tube is completed.

[0042] During the stern tube boring process, the installed intermediate bearing 13 is continuously lubricated.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions 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 preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions for which protection is sought in the present invention.

Claims

1. A method for boring front and rear bearings of a stern tube, characterized in that: The method specifically comprises the following steps: S1, measure the deflection of the pole, set up temporary supports at both ends of the pole to support the pole on the platform, use a dial indicator to measure the height of the middle of the pole, and calculate the deflection value of the pole; S2: Use a sling and hand chain hoist to pass the row rod through the stern tube to be bored. Install fixed bearings at both ends of the row rod and a bearing seat outside the fixed bearing. Install a bearing seat bracket on the bearing seat and weld the bearing seat bracket to the shaft hub using angle iron or channel steel. S3: Open a process hole on the connecting pipe wall in the middle of the stern tube, install an intermediate bearing in the middle of the rod, adjust the installation position of the intermediate bearing through the process hole according to the deflection value, and fix the intermediate bearing to the rod with the adjustment screw; S4, install the tool holder on the rod and bore the stern tube according to the boring requirements.

2. A method for boring front and rear bearings of a stern tube according to claim 1, characterized in that: The temporary support positions at both ends of the row rod are the installation positions of the fixed bearings. The heights of the temporary supports at both ends of the row rod are the same. The height value H1 of the row rod and the platform at the temporary support is measured. The height values of the temporary supports at both ends of the row rod are the same. The height value H2 of the middle position of the row rod and the platform is measured. The deflection value of the middle part of the row rod is H=H1-H2.

3. The method for boring front and rear bearings of a stern tube according to claim 1, characterized in that: The intermediate bearing includes a first bearing and a second bearing, both of which are semicircular. Fixed platforms are respectively provided at both ends of the first bearing, and fixed bolt holes are provided on the fixed platforms. Fixed bolt holes are respectively provided at both ends of the second bearing, and the fixing bolt holes on the second bearing correspond to the fixing bolt holes on the first bearing.

4. The method for boring front and rear bearings of a stern tube according to claim 3, characterized in that: The first bearing and the second bearing are respectively provided with two positioning grooves, and the positioning grooves are evenly distributed on the first bearing and the second bearing.

5. The method for boring front and rear bearings of a stern tube according to claim 4, characterized in that: The adjustment and fixation of the intermediate bearing on the row rod are specifically as follows: after the row rod passes through the stern tube, a process hole is opened on the side of the middle part of the stern tube, the intermediate bearing is installed on the row rod through the opened process hole, and the intermediate bearing is connected and fixed to the row rod by a fixing bolt. After the intermediate bearing is fixed, a bearing adjustment hole is opened on the corresponding side of the stern tube according to the installation position of the intermediate bearing. Four bearing adjustment holes are evenly opened on the side of the stern tube, and an adjusting screw is installed in the bearing adjustment hole. The tail of the adjusting screw is connected to the side of the intermediate bearing. The depth of the adjusting screw screwed into the stern tube is adjusted according to the measured deflection value of the middle part of the row rod. The height of the intermediate bearing is adjusted so that the height of the middle part of the row rod is equal to the height of the two ends of the row rod.

6. The method for boring front and rear bearings of a stern tube according to claim 5, characterized in that: The adjusting screw is connected to the bearing adjusting hole through a thread, and the tail of the adjusting screw is connected to the positioning groove on the side of the intermediate bearing by rotating the row rod.

7. The method for boring front and rear bearings of a stern tube according to claim 5, characterized in that: Two tapered holes are evenly provided on the side surface of the stern tube on one side of the bearing adjustment hole. A dial indicator is installed in the tapered hole, and the tail end of the dial indicator is connected to the side surface of the intermediate bearing.

8. The method for boring front and rear bearings of a stern tube according to claim 1, characterized in that: The boring of the stern tube is specifically as follows: S41, install the inner hole tool holder at both ends of the stern tube to bore the inner circle of the stern tube. When boring, perform rough boring first, with a cutting depth of 1-5mm. After the rough boring is completed, perform fine boring, with a cutting depth of 0.20-0.4mm. S42, after the inner circle boring of the stern tube is completed, a flat tool holder is installed at both ends of the stern tube to bore the two ends of the stern tube. When boring, rough boring is first performed with a cutting depth of 1-5mm. After the rough boring is completed, fine boring is performed with a cutting depth of 0.20-0.4mm; the boring of the stern tube is completed.

9. The method for boring front and rear bearings of a stern tube according to claim 1, characterized in that: During the stern tube boring process, the installed intermediate bearing is continuously lubricated.

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