KR20020090053A - Rudder manufacturing method for a ship - Google Patents

Abstract

PURPOSE: A method for manufacturing a rudder for a ship is provided to simultaneously process combining holes in first and second combining members, to enhance the precision of respective combining holes to a central shaft by automatically aligning the combining holes during processing, and to improve productivity by saving the time for processing. CONSTITUTION: A first combining member combined with a rudderstock is formed by casting and welded to the upper end of a plate unit by welding. A second combining member cast in a specific shape is welded to the plate unit below the first combining member(S22). A first and a second center holes of a specific size are processed in respective combining members before the combining members are welded with the plate unit. A pin frame orbitingly supported on a ship is automatically aligned with the central shaft of a first and a second combining holes by simultaneously boring the center holes with a single drive shape(S30).

Description

Rudder manufacturing method for a ship}

The present invention relates to a method for manufacturing a rudder for ships, and more particularly, to a method for manufacturing a rudder for ships, which greatly improves productivity and accuracy by using a simplified machining process.

In general, the rudder (rudder) is pivotally installed at the rear of the ship, and is connected to the rudder stock (rudder stock) to control the movement of the rudder to steer the direction of the propulsion obtained by the propeller installed close. That is, the lower end of the ship is mounted with the propeller connected to the engine inside, thereby the propeller is rotated by receiving power from the engine. The rotation of the propeller causes the fluid to flow backwards, and the ship moves forward by gaining propulsion in reaction to fluid movement. This propulsion force is steered by a rudder placed close to the rear of the propeller, allowing the ship to move in the desired direction.

One example of such a rudder for ships is shown in FIGS. 1 and 2. Referring to FIGS. 1 and 2, the rudder 10 has a predetermined shape and a plate unit 11 welded to a plurality of iron plates and the like, and a first coupling coupled to an upper end of the plate unit 11 by welding. A member 13 and a second coupling member 15 coupled by welding under the first coupling member 13. Each of the coupling members 13 and 15 is formed in a predetermined portion of the plate unit 11 after casting using iron. Each of the coupling holes 13a and 15a tapered in each of the coupling members 13 and 15 is inserted and coupled to each of the upper and lower pintles 16 and 17. Each pintle (16) (17) is rotatably coupled coaxially with respect to the frame fixed to the vessel 1, that is, the fixing cone (3). That is, each of the upper and lower pintles 16 and 17 constitutes a rotation axis of the rudder 10 with respect to the ship 1, and is installed coaxially.

In addition, the upper surface of the first coupling member 11, a member for adjusting the posture of the rudder 10, that is, the rudder stock (5) for turning the rudder 10 around the pintle (16, 17) Is combined. In this case, the center of rotation C of the rudder stock 5 should be installed to be coaxial with the central axis of each pintle 16, 17, that is, aligned. To this end, each pinhole 16, 17 should be precisely processed so that the center axis of each of the coupling holes 13a, 15a to which the pinholes 16 and 17a are aligned.

Looking at the machining process of the rudder 10, first, the first and second coupling members 13 and 15 are welded to the plate member 11. Then, the coupling hole 13a is first cut by using a predetermined cutting tool known to the first coupling member 13. Then, the cutting tool is first set such that the center axis of the combined coupling hole 13a and the rotational center axis of the cutting tool are aligned, and then the coupling hole 15a is precisely placed on the remaining second coupling member 15. Cutting process. When the machining of each coupling hole 13a and 15a is completed, once again, after confirming that the central axis of each of the coupling holes 13a and 15a is aligned, a series such as assembly of pintles 15 and 16 is performed. Will be performed.

However, since the respective coupling holes 13a and 15a must be sequentially processed using a separate cutting tool as described above, not only does it take a long time but also it is difficult to secure machining precision. That is, when the rudder 10 is employed in a large vessel of 40,000 tons or more, the allowable error for the alignment of each of the coupling holes 13a and 15a is approximately, considering that the length of the rudder 10 reaches several m. As it is required to be ± 0.25mm, it is very difficult to carry out practically precise machining.

Meanwhile, reference numerals not described in FIGS. 1 and 2 are given to explain the present invention.

The present invention has been made to solve the above problems, and an object thereof is to provide an improved method for manufacturing a ship rudder to shorten the machining process of the rudder and to improve the processing precision.

1 is a schematic perspective view showing a general marine rudder.

Figure 2 is a cross-sectional view of the coupling of the ship rudder shown in FIG.

Figure 3 is a flow chart for explaining a method for manufacturing a rudder for ships according to an embodiment of the present invention.

4A and 4B are cross-sectional views showing first and second coupling members, respectively.

5 is a schematic cross-sectional view showing a state in which the first and second coupling members are coupled to the plate unit.

6 is a view showing a state in which a drive shaft for processing the first and second coupling member is located.

7 and 8 each show a state of processing in a state in which a cutting tool is mounted on the drive shaft.

<Description of Symbols for Major Parts of Drawings>

11..Plate unit 13, 23. First coupling member

15,25..Second coupling member 16,17..First and second pintle

23a, 25a .. First and second coupling hole 30. Processing device

31. Driving shaft 33. Driving part

41,43.1st and 2nd cutting tool

Method of manufacturing a rudder for ships according to the present invention for achieving the above object, in the manufacturing method of the rudder for ships to adjust the direction of the ship while turning by the rudderstock installed in the rear of the ship, the rudderstock is coupled Fabricating a first coupling member to be welded to the upper end of the plate unit forming the body of the rudder; Welding the second coupling member cast into a predetermined shape to the plate unit so as to be positioned below the first coupling member; Machining first and second centimeters of a predetermined size in each coupling member before welding each coupling member to the plate unit; Forming the central axes of the first and second coupling holes to be pivotally supported by the ship by internally machining the center holes of the coupling members at the same time by using a single drive shaft to automatically unalign the center holes; Characterized in that it comprises a.

Here, the coupling hole processing step, the step of inserting the drive shaft to pass through the center hole of the welded coupling member; Measuring the alignment of the drive shaft with respect to each center hole to fix the attitude of the drive shaft; Mounting first and second cutting tools on the drive shaft to form first and second coupling holes by tapering each of the first and second center holes to a predetermined size and a slope on the drive shaft. ; It is preferable to include; forming the first and second coupling holes simultaneously by cutting the first and second center holes by rotating and driving the drive shaft forward and backward.

In addition, it is preferable that the first and second cutting tools coupled to the drive shaft have inclined blades having a predetermined inclination with respect to the center of rotation when installed on the drive shaft.

Hereinafter, a method of manufacturing a ship rudder according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIG. 3, as shown in FIG. 1, a plurality of iron plates are assembled to prepare a plate unit 11 having a predetermined shape (S10). In addition, the plate unit 11 is prepared, and as shown in FIGS. 4A and 4B, the first and second coupling members 23 having first and second center holes H1 and H2 are formed, respectively. (25) to prepare (S21). Each of the coupling members 23 and 25 is provided by using a different material from the plate unit 11, that is, steelcasting, that is, casting and manufacturing the casting, and the first and second center holes H1 ( H2) is formed at the same time.

Subsequently, each of the prepared coupling members 23 and 25 is joined to the predetermined position of the plate unit 11 by welding, respectively (S22). In this case, as shown in FIG. 5, the first coupling member 23 is coupled to the upper end of the plate unit 11, and the second coupling member 23 is directly below the first coupling member 25, respectively. Center holes (H1) of (H2) are installed to be positioned approximately coaxially with each other. Here, reference numeral 11a is a member made of steel plates to be coupled to the plate member 11 to be positioned on the bar side of the welded first coupling member 23, and then coupled to each of the coupling members 23 and 25. When the ball is processed, the coupling holes are processed and welded to the plate member 11 in order to eliminate interference with the processing device 30.

When the welding coupling of each coupling member 23, 25 is completed, the plate unit 11 is installed in a predetermined posture, for example, a side-down posture, for convenience of processing, and then the ball shaft 31 of a predetermined length is installed. ) Is inserted into the first and the first center hole (H1) (2) (S23). The drive shaft 31 has a sufficient length so as to pass through each center hole (H1) (H2) at the same time, and is supported by a predetermined support portion 32 so as to rotate and move forward and backward, and includes a conventional drive motor and the like. Rotation and forward and rearward driving are performed by one drive unit 33. The drive shaft 31, the support portion 32, the drive portion 33, and the like are referred to as a processing apparatus 30 or a processing unit, and nulls are used throughout the industry, and thus detailed description thereof will be omitted. However, the driving shaft 31 is characterized in that it has a length sufficient to be positioned in the state passing through each center hole (H1) (H2) at the same time. In addition, as shown in phantom in Figure 6, as the drive shaft 31 has a sufficient length, an additional auxiliary support 34 for supporting the rotation and the forward and backward movement may be further provided.

Subsequently, the alignment with respect to each center hole H1 (H2) of the drive shaft 31 inserted in each center hole H1 (H2) is measured (S24). Specifically, the rotation center axis of the drive shaft 31 and the pivot center axis when the plate unit 30 is installed in the vessel are measured by comparing with a previously designed value.

Then, posture fixation of the drive shaft 31 in which the alignment with respect to the center hole H1 and H2 is made (S25). To this end, in a state where the plate unit 11 to which the coupling members 23, 25, etc. to be processed are coupled is fixed, the processing apparatus 30 is fixed to the plate unit 11.

As shown in FIG. 7, the first and second cutting tools 41 and 43 are mounted at predetermined positions of the driving shaft 31 fixed in the aligned state (S26). The first cutting tool 41 is for expanding the inner diameter of the first center hole H1 by processing the first coupling member 23, and the second cutting tool 43 is the second coupling member 25. ) To expand the inner diameter of the second center hole (H2) to taper. The cutting tools 41 and 43 are installed at predetermined intervals, and are fixed to the drive shaft 31 by predetermined mounting means, for example, clampers 42 and 45. In addition, a plurality of cutting tools 41 and 43 may be mounted. In addition, each of the cutting tools 41 and 43 has inclined blades 41a and 43a so as to taper each center hole H1 and H2 to a predetermined inner diameter.

Subsequently, after mounting the cutting tools 41 and 43, the processing apparatus 30 is driven to cut the inner diameters of the first and second center holes H1 and H2 (S27). That is, when the driving shaft 31 is driven in the rotational and forward and backward directions by the driving force of the driving unit 33, as shown in FIG. 8, the cutting tools 41 and 43 mounted on the driving shaft 33. ) Tapering the inner diameter of each center hole (H1) (H2) to a predetermined inclination while rotating and moving forward and backward to form the first and second coupling holes (23a, 25a). Thus, by simultaneously machining each center hole (H1) (H2) using a single drive shaft 31, each of the center axis is made coaxial, that is, the coupling holes (23a) (25a) that the alignment of the center axis is automatically ) Can be processed. Therefore, as compared with the alignment of each central axis while machining the coupling hole in a separate process to each coupling member as in the prior art, it is possible to increase the productivity by shortening the process.

Meanwhile, after the first and second coupling holes 23a and 25a are processed, each cutting tool 41 and 43 and the driving shaft 31 are disassembled and a known machining process is performed. That is, the grinding of the upper end of the first coupling member 23, that is, the coupling surface 23b to which the rubber talk is to be precisely formed at right angles with respect to the central axis C of the coupling holes 23a and 25a, is performed. ) To be processed (S28). In this way, the engaging surface 23b of the first coupling member 23 is ground, so that the so-called metal contact rate with the rubber talk to be joined later can reach at least 70% or more. This value is an important variable in aligning the center of rotation of the rubber talkstock with respect to the central axis of each of the aligned coupling holes 23a and 25a.

On the other hand, after the engaging surface 23b of the first coupling member 23 is processed to have a predetermined metal contact ratio, a screw hole 23c for coupling the rubber talk to the coupling surface 23B by screws is shown. As shown in FIG. 1, a plurality of processes are performed (S29).

Subsequently, the upper and lower pintles 16 and 17 are coupled to the first and second coupling holes 23a and 25a, respectively, as shown in FIG. 2 (S30). 8 has tapered inserts 16a and 17a having a shape corresponding to each of the coupling holes 23a and 25a tapered, as shown in FIG. 8, and cylindrical cylindrical portions 16b and 17b. It has a threaded portion (16c) (17c) to which the nut is coupled. Therefore, as shown in FIG. 2, after coupling each pintle 16, 17 to the coupling hole, the pintle 16 and 17 are completed by fixing using the nut N. FIG.

As such, when the actual rudder manufacturing process is completed, as shown in FIG. 2, the rubber talkstock 5 is coupled to the first coupling member 23, and the fixing cone is fixed to the pintles 16 and 17. By connecting (3), the entire rudder can be pivoted coaxially by the rotational driving of the rubber talk (5).

According to the manufacturing method of the ship rudder of the present invention as described above, it is possible to simultaneously process the coupling holes to be coupled to the pintle to each of the first and second coupling members coupled to the plate unit, the central axis of the coupling hole during processing It is automatically unlined and machined to achieve this coaxial axis. Therefore, it is possible to increase the accuracy of the central axis of each coupling hole, it is possible to increase the productivity by reducing the machining time.

The present invention is not limited to the above specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the invention as claimed in the following claims. Of course, such changes are intended to fall within the scope of the claims set forth.

Claims (3)

In the manufacturing method of the rudder for ships to adjust the traveling direction of the ship while turning by the rudderstock installed in the rear of the ship, Manufacturing a first coupling member to which the rudder stock is to be coupled to weld the upper end of a plate unit constituting the rudder body; Welding the second coupling member cast into a predetermined shape to the plate unit so as to be positioned below the first coupling member; Machining first and second centimeters of a predetermined size in each coupling member before welding each coupling member to the plate unit; Forming inner centers of the first and second coupling holes to be pivotally supported by the ship by simultaneously machining the center holes of the coupling members using a single drive shaft to automatically unalign the center holes; Ship rudder manufacturing method comprising a. The method of claim 1, wherein the combining hole processing step, Inserting a drive shaft to pass through the center hole of the welded coupling members; Measuring the alignment of the drive shaft with respect to each center hole to fix the attitude of the drive shaft; Mounting first and second cutting tools on the drive shaft to form first and second coupling holes by tapering each of the first and second center holes to a predetermined size and a slope on the drive shaft. ; And rotating the driving shaft forward and backward to form the first and second coupling holes by cutting the first and second center holes, respectively, to simultaneously form the first and second coupling holes. The method of claim 2, wherein the first and second cutting tools coupled to the drive shaft have inclined blades having a predetermined slope with respect to the center of rotation when installed on the drive shaft.