CN113305799A - Marking method for rear propeller shaft bracket steel casting - Google Patents
Marking method for rear propeller shaft bracket steel casting Download PDFInfo
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- CN113305799A CN113305799A CN202110597330.3A CN202110597330A CN113305799A CN 113305799 A CN113305799 A CN 113305799A CN 202110597330 A CN202110597330 A CN 202110597330A CN 113305799 A CN113305799 A CN 113305799A
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- Prior art keywords
- shaft bracket
- rear propeller
- propeller shaft
- plane
- marking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H7/00—Marking-out or setting-out work
- B25H7/04—Devices, e.g. scribers, for marking
- B25H7/045—Devices, e.g. scribers, for marking characterised by constructional details of the marking elements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses a marking method of a rear propeller shaft bracket steel casting, which comprises the following steps: s1 lofting: compiling a plane layout of the stern shaft bracket; s2 leveling: hoisting the rear propeller shaft bracket to a scribing platform, and correcting to be horizontally placed; s3 center line: marking out the central lines of the shaft hole, the arm and the web plate on the rear propeller shaft bracket according to the plane size of the plane lofting drawing; s4 cardboard preparation: according to the plane layout, manufacturing a clamping plate which is consistent with the actual shapes and sizes of the shaft hole, the arm and the radial plate of the rear propeller shaft bracket; s5 marking: and checking the clamping plate according to the central line on the rear propeller shaft bracket, and determining the position with inconsistent size by using a scriber. According to the method, the center lines of the shaft hole, the arm and the web are positioned by compiling the plane lofting drawing in an auxiliary mode, and the clamping plate is manufactured for assisting in scribing, so that the scribing of the rear propeller shaft frame steel casting is realized, and the size accuracy of the rear propeller shaft frame is ensured.
Description
Technical Field
The invention relates to the technical field of steel casting manufacturing, in particular to a marking method for a rear propeller shaft bracket steel casting.
Background
The rear propeller shaft bracket is an important component of a power transmission system of a ship, and is subjected to strong impact force and oscillation force caused by rotation of a propeller in the sailing process of the ship. The rear propeller shaft bracket is also called as a double-arm bracket and a propeller strut, is of a propeller strut structure (see figures 1 to 3), one end of the propeller shaft bracket is provided with a shaft hole 1, two arms 2 are connected with the shaft hole 1, the other end of each arm 2 is provided with a web 3, the web 3 is provided with a plurality of rib plate structures 4, the web 3 and the rib plates are connected with a ship bottom plate, and the propeller shaft bracket has the advantages of streamline shape and complex structure, angle control of the shaft hole 1 and the two arms 2, small tolerance and easy deformation in the casting and heat treatment processes.
After the casting of the rear propeller shaft bracket steel casting is finished, the sizes of the shaft hole 1 and the rib plate, and the center lines of the double arms 2 and the web 3 need to be verified and shaped. The dimensions of the shaft hole 1 and the rib plate are preferably checked, but it is difficult to precisely check the dimensions of the streamline web 3 and the multi-angle double arm 2, and the dimensional deviation of the above-mentioned portions causes a problem in the subsequent process.
Disclosure of Invention
The invention aims to provide a marking method for a rear propeller shaft bracket steel casting, which overcomes the defects in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a marking method for a rear propeller shaft bracket steel casting comprises the following steps:
s1 lofting: compiling a plane layout of the stern shaft bracket;
s2 leveling: hoisting the rear screw shaft bracket to a scribing platform, and correcting to be horizontally placed;
s3 center line: marking out the central lines of the shaft hole, the arm and the web plate on the rear propeller shaft bracket according to the plane size of the plane lofting drawing;
s4 cardboard preparation: according to the plane layout, manufacturing a clamping plate which is consistent with the actual shapes and sizes of the shaft hole, the arm and the radial plate of the rear propeller shaft bracket;
s5 marking: and checking the clamping plate according to the central line on the rear propeller shaft bracket, and determining the position with inconsistent size by using a scriber.
In a preferred embodiment of the present invention, the method further comprises:
s6 shaping: and according to the scribing result, carrying out size trimming on the rear propeller shaft bracket steel casting so as to meet the design requirement.
In a preferred embodiment of the present invention, the S1 lofting: the plane lofting map of the screw shaft bracket after being compiled specifically is as follows:
and (3) according to a drawing, performing plane dimension lofting on the rear propeller shaft bracket, converting the dimensions of the three-dimensional shaft hole, the arm and the web into two-dimensional plane dimensions, and manufacturing a plane lofting drawing of the rear propeller shaft bracket.
In a preferred embodiment of the present invention, the S2 leveling: and hoisting the rear propeller shaft bracket to a scribing platform, and correcting to be horizontally placed, wherein the method specifically comprises the following steps:
and hoisting the rear stern shaft bracket to a scribing platform, referring to the upper end surface and the lower end surface of the shaft hole, determining the central points of the upper end surface and the lower end surface of the shaft hole under the condition of ensuring the machining allowance of the shaft hole, projecting the central points to the scribing platform according to the two central points to scribe a projection central line, respectively scribing the projection central lines of each arm and each amplitude plate on the scribing platform by combining the size of the plane lofting drawing, and adjusting the rear stern shaft bracket to the position according with the projection central line on the scribing platform.
In a preferred embodiment of the present invention, the S3 line is: according to the plane size of the plane lofting drawing, marking the central lines of the shaft hole, the arm and the web on the rear propeller shaft bracket, specifically:
s31 drawing the central line of the shaft hole according to the central points of the upper and lower end surfaces of the shaft hole in the step S2;
s32, according to the projected central lines of the arms and the webs marked on the marking platform, by referring to the plane size of the lofting drawing, using a laser instrument to mark the corresponding arms and the webs with the corresponding size along the projected central lines, and then respectively marking the central lines of the arms and the webs;
s33, according to the size of the lofting drawing, adjusting the position of the rear screw shaft bracket by using a jack and a hoisting crane so that all the processing surfaces have enough processing allowance.
In a preferred embodiment of the present invention, the S4 card board is made of: according to the plane layout, a clamping plate which is consistent with the actual shapes and sizes of the shaft hole, the arm and the web of the rear propeller shaft bracket is manufactured, and the method specifically comprises the following steps:
and drawing the specific shapes of the shaft hole, the arm and the web plate of the rear propeller shaft bracket on a wood plate respectively according to the plane layout, and then cutting to manufacture a clamping plate.
Compared with the prior art, the invention has the beneficial effects that:
according to the method, the center lines of the shaft hole, the arm and the web are positioned by compiling the plane lofting drawing in an auxiliary mode, and the clamping plate is manufactured for assisting in scribing, so that the scribing of the rear propeller shaft frame steel casting is realized, and the size accuracy of the rear propeller shaft frame is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic front view of a rear propeller shaft mount of the present invention;
FIG. 2 is a schematic top view of FIG. 1;
FIG. 3 is a side view of FIG. 1;
FIG. 4 is a flow chart of a method for marking off a rear propeller shaft bracket steel casting according to the present invention;
fig. 5 is a schematic view of the aft transom mount in the orientation of the scoring platform.
Specifically, 1, a shaft hole; 2. an arm; 3. a web; 4. a rib plate structure; 5. processing the dough; 6. cushion blocks; 7. a jack; 8. and a scribing platform.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 4, a method for marking off a rear propeller shaft bracket steel casting includes the following steps:
s1 lofting: and compiling a plane layout of the stern shaft bracket.
Specifically, according to a drawing, the plane dimension lofting is performed on the rear propeller shaft bracket, the dimensions of the three-dimensional shaft hole 1, the arm 2 and the web 3 are converted into the dimensions of a two-dimensional plane, and a plane lofting drawing of the rear propeller shaft bracket is manufactured.
S2 leveling: and hoisting the rear propeller shaft bracket to the scribing platform 8, and correcting to be horizontally placed.
Specifically, referring to fig. 5, the rear propeller shaft bracket is lifted to the scribing platform 8, and is horizontally placed with 3 working surfaces 5 (an axial hole end surface and two rib plate structure end surfaces) as supporting points. Referring to the upper and lower end faces of the shaft hole 1, under the condition of ensuring the machining allowance of the shaft hole 1, determining the central points of the upper and lower end faces of the shaft hole 1, projecting the central points to a marking platform 8 to mark a projection central line a 'according to the two central points, respectively marking projection central lines b', c ', d', e 'of each arm 2 and a web 3 on the marking platform 8 according to the size of a plane lofting drawing, and adjusting a rear stern shaft bracket to a position according with the projection central line according to the projection central lines a', b ', c', d ', e' on the marking platform 8.
S3 center line: according to the plane size of the plane lofting drawing, the central lines of the shaft hole 1, the double arms 2 and the web 3 are marked on the rear propeller shaft bracket.
In particular, the amount of the solvent to be used,
s31 is drawn the central line a of the shaft hole 1 according to the central points of the upper and lower end surfaces of the shaft hole 1.
S32, based on the projected center lines b ', c ', d ', e ' of the arm 2 and the web 3 scribed on the scribing table 8, the respective center lines b ', c, d, e of the arm 2 and the web 3 are scribed by using a laser along the projected center lines b ', c ', d ', e ' with reference to the plane size of the layout, on the corresponding arm 2 and web 3. That is, the projected center lines b ', c' drawn on the drawing table 8 are drawn along the projected center lines b ', c' drawn by the laser instrument with reference to the plane size of the layout, and then the center lines b, c of the both arms 2 are drawn by drawing the corresponding sizes of the projected center lines b ', c' drawn by the laser instrument. Based on the projected center lines d ', e' scribed on the scribing table 8, the dimensions are drawn on the web 3 along the scribed projected center lines d ', e' using a laser with reference to the plane dimensions of the loft drawing, and then the center lines d, e of the web 3 are scribed.
S33, marking the center lines d and e of the web 3, adjusting the position of the rear screw shaft bracket by using a cushion block 6, a jack 7 and a hoisting crane according to the size of a plane layout, so that all the processing surfaces 5 have enough processing allowance, the blank surface has no shortage, if the blank is deficient due to the deformation of the steel casting of the rear screw shaft bracket, the position of the rear screw shaft bracket is adjusted, and the shortage of the blank surface is reduced as much as possible under the condition of ensuring the allowance of the processing surfaces 5.
S4 cardboard preparation: according to the plane layout, a clamping plate which is consistent with the actual shape and size of the shaft hole 1, the arm 2 and the web 3 of the rear propeller shaft bracket is manufactured.
Specifically, according to a plane layout, the specific shapes of the shaft hole 1, the arm 2 and the web 3 of the rear propeller shaft bracket are respectively drawn on a wood board and then cut to manufacture the clamping board.
S5 marking: the clamping plate is verified according to the central lines a, b, c, d and e on the rear propeller shaft bracket, and the position with inconsistent size is determined by a scriber.
The method also comprises the following steps: s6 shaping: and (4) according to the scribing result, carrying out size trimming on the rear propeller shaft bracket steel casting to meet the design requirement.
In conclusion, the drawing method has the advantages that the center lines of the shaft holes, the arms and the spokes are positioned in an auxiliary mode through drawing the plane lofting drawing, the clamping plates are manufactured for assisting in drawing, the drawing of the steel casting of the rear stern shaft bracket is achieved, and the size accuracy of the rear stern shaft bracket is ensured.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A marking method for a rear propeller shaft bracket steel casting is characterized by comprising the following steps:
s1 lofting: compiling a plane layout of the stern shaft bracket;
s2 leveling: hoisting the rear screw shaft bracket to a scribing platform, and correcting to be horizontally placed;
s3 center line: marking out the central lines of the shaft hole, the arm and the web plate on the rear propeller shaft bracket according to the plane size of the plane lofting drawing;
s4 cardboard preparation: according to the plane layout, manufacturing a clamping plate which is consistent with the actual shapes and sizes of the shaft hole, the arm and the radial plate of the rear propeller shaft bracket;
s5 marking: and checking the clamping plate according to the central line on the rear propeller shaft bracket, and determining the position with inconsistent size by using a scriber.
2. The method for marking off the rear propeller shaft bracket steel casting according to claim 1, further comprising:
s6 shaping: and according to the scribing result, carrying out size trimming on the rear propeller shaft bracket steel casting so as to meet the design requirement.
3. The method for marking the rear propeller shaft bracket steel casting according to claim 1, wherein the S1 lofting comprises the following steps: the plane lofting map of the screw shaft bracket after being compiled specifically is as follows:
and (3) according to a drawing, performing plane dimension lofting on the rear propeller shaft bracket, converting the dimensions of the three-dimensional shaft hole, the arm and the web into two-dimensional plane dimensions, and manufacturing a plane lofting drawing of the rear propeller shaft bracket.
4. The method for marking off the aft transom frame steel casting of claim 1, wherein said S2 leveling: and hoisting the rear propeller shaft bracket to a scribing platform, and correcting to be horizontally placed, wherein the method specifically comprises the following steps:
and hoisting the rear stern shaft bracket to a scribing platform, referring to the upper end surface and the lower end surface of the shaft hole, determining the central points of the upper end surface and the lower end surface of the shaft hole under the condition of ensuring the machining allowance of the shaft hole, projecting the central points to the scribing platform according to the two central points to scribe a projection central line, respectively scribing the projection central lines of each arm and each amplitude plate on the scribing platform by combining the size of the plane lofting drawing, and adjusting the rear stern shaft bracket to the position according with the projection central line on the scribing platform.
5. The method for marking off the aft transom frame steel casting of claim 1, wherein said S3 center line marking off: according to the plane size of the plane lofting drawing, marking the central lines of the shaft hole, the arm and the web on the rear propeller shaft bracket, specifically:
s31 drawing the central line of the shaft hole according to the central points of the upper and lower end surfaces of the shaft hole in the step S2;
s32, according to the projected central lines of the arms and the webs marked on the marking platform, by referring to the plane size of the lofting drawing, using a laser instrument to mark the corresponding arms and the webs with the corresponding size along the projected central lines, and then respectively marking the central lines of the arms and the webs;
s33, according to the size of the lofting drawing, adjusting the position of the rear screw shaft bracket by using a jack and a hoisting crane so that all the processing surfaces have enough processing allowance.
6. The method for marking the rear propeller shaft bracket steel casting according to claim 1, wherein the S4 snap gauge is manufactured by the following steps: according to the plane layout, a clamping plate which is consistent with the actual shapes and sizes of the shaft hole, the arm and the web of the rear propeller shaft bracket is manufactured, and the method specifically comprises the following steps:
and drawing the specific shapes of the shaft hole, the arm and the web plate of the rear propeller shaft bracket on a wood plate respectively according to the plane layout, and then cutting to manufacture a clamping plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110597330.3A CN113305799B (en) | 2021-05-31 | 2021-05-31 | Marking method for rear propeller shaft bracket steel casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110597330.3A CN113305799B (en) | 2021-05-31 | 2021-05-31 | Marking method for rear propeller shaft bracket steel casting |
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| CN113305799A true CN113305799A (en) | 2021-08-27 |
| CN113305799B CN113305799B (en) | 2022-09-23 |
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2021
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| CN113305799B (en) | 2022-09-23 |
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