Preparation method of large stainless steel controllable-pitch propeller sample blade mold

Abstract

The invention discloses a preparation method of a large stainless steel controllable-pitch propeller real sample blade mold. The preparation method comprises the following steps: setting out a controllable-pitch propeller section sample plate; rolling a section sample plate steel plate; rolling a stainless steel plate into a cylindrical surface steel plate on a plate rolling machine according to the radius of each section; the prepared mold is high in strength and good in stability; the method can be widely applied to preparation of various large-scale stainless steel controllable-pitch propellers which are larger than 6 meters in diameter and are produced in batches; meanwhile, the blade manufactured through the die is stable in quality, high in surface precision and high in batch production efficiency, the precision of all parts of the blade can be guaranteed, the structural strength of the blade can be guaranteed, and deformation caused by the die structure during repeated modeling of the blade is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of controllable pitch propeller preparation, and particularly relates to a preparation method for a full-scale blade mold of a large stainless steel controllable pitch propeller. Background Art

[0002] A large stainless steel controllable pitch propeller is a single-blade propeller blade. Its casting molds generally use wooden full-scale models and aluminum full-scale models. The strength and stiffness of the models are limited, and the service life is short. Limited by the diameter of the controllable pitch propeller, it is generally applicable to small controllable pitch propellers and it is not easy to achieve mass production.

[0003] The Chinese utility model patent (Patent No. CN89205128.0) discloses a steel skeleton fiberglass controllable pitch propeller, and the Chinese invention patent (Patent No. ZL200810197274.9) discloses a method for preparing a full-scale blade of a large copper alloy propeller using fiberglass. Both use fiberglass as the controllable pitch propeller mold and then use the fiberglass mold to make the controllable pitch propeller product, but the strength and stiffness of the models are both limited and the service life is short. Summary of the Invention

[0004] The purpose of the present invention is to solve the above technical problems, and provide a preparation method for a full-scale blade mold of a large stainless steel controllable pitch propeller with non-deformable and high-strength mold during repeated blade modeling, so as to ensure the geometric dimensions and casting quality of the castings.

[0005] To achieve the above purpose, the present invention provides a preparation method for a full-scale blade mold of a large stainless steel controllable pitch propeller as follows:

[0006] 1) Lofting of the controllable pitch propeller cross-section template: Loft the profile templates of each cross-section radius and envelope them on the cylindrical surfaces of each cross-section radius;

[0007] 2) Rolling the cross-section template steel plate: Roll out the cylindrical surface steel plate on a rolling machine with a stainless steel plate according to the radius of each cross-section;

[0008] 3) Milling the cross-section template: Mill the profile templates of each cross-section radius on the cylindrical surface steel plate rolled out on the milling machine;

[0009] 4) Assembling the controllable pitch propeller skeleton: Place the profile templates of each cross-section radius on the platform according to the radius, height and pitch angle of each cross-section, and connect the profile templates of each envelope with round steel to form the controllable pitch propeller blade skeleton;

[0010] 5) Filling: Fill the mixture between two adjacent profile templates of the envelope;

[0011] 6) Shaping: Scrape and smooth the upper and lower surfaces of the mixture filled between the profile templates of the envelope to form a full-scale blade mold of a stainless steel controllable pitch propeller.

[0012] Further, the stainless steel controllable pitch propeller full-scale blade mold and the flange full-scale mold are welded and assembled into a whole through reserved welding points.

[0013] Further, the fillets of the pressure surface and the suction surface of the stainless steel controllable pitch propeller full-scale blade mold are filled with a mixture.

[0014] Further, the inside of the flange full-scale mold is a steel skeleton and the outside is inlaid with wooden blocks.

[0015] Further, the thickness of the stainless steel plate is 4 - 6 mm.

[0016] Further, the raw materials of the mixture include, by weight percentage, 20 - 30% of wood chips, 60 - 70% of gypsum, 5 - 10% of palm fur, 1 - 5% of steel bars, and the balance of water.

[0017] Further, the blade diameter prepared by the stainless steel controllable pitch propeller full-scale blade mold is greater than 6 m.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The mold prepared by the present invention has high strength and good stability; it can be widely used in the preparation of large stainless steel controllable pitch propellers with a diameter greater than 6 meters and in mass production; at the same time, the blades prepared by the mold of the present invention have stable quality, high surface precision, and high mass production efficiency, which is conducive to ensuring the precision of each part of the blade and can also ensure the structural strength of the blade, avoiding deformation due to the mold structure during repeated shaping of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 a, 1b, and 1c are respectively the front view, top view, and side view of the controllable pitch propeller;

[0020] Figure 2 a, 2b are the front view and top view of the computer lofting cross-section template;

[0021] Figure 3 a, 3b are the front view and top view of the cross-section template milled by the milling machine;

[0022] Figure 4 is the assembly schematic diagram of the three cross-section templates;

[0023] Figure 5 is the overall mold schematic diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described below with reference to the drawings and specific embodiments.

[0025] As Figure 1 (a, b, c) shown in the controllable pitch propeller, the preparation method of the large stainless steel controllable pitch propeller full-scale blade mold of the present invention is specifically as follows:

[0026] 1) Lofting of the adjustable pitch propeller cross-section template: Use a computer to generate the contour cross-section templates for the radii of 0.2R, 0.25R, 0.3R, 0.4R, 0.5R, 0.6R, 0.7R, 0.8R, 0.9R, and 0.95R of each cross-section, and envelope them on the cylindrical surfaces with the corresponding cross-section radii, as shown in Figure 2 (a, b);

[0027] 2) Rolling the cross-section template steel plate: Use a stainless steel plate with a thickness of 4 - 6 mm (preferably 5 mm) to roll out the steel plate of the cylindrical surface on a rolling machine according to the radii of 0.2R, 0.25R, 0.3R, 0.4R, 0.5R, 0.6R, 0.7R, 0.8R, 0.9R, and 0.95R of each cross-section;

[0028] 3) Milling the cross-section template: Mill the contour envelope cross-section templates for the radii of 0.2R, 0.25R, 0.3R, 0.4R, 0.5R, 0.6R, 0.7R, 0.8R, 0.9R, and 0.95R of each cross-section from the cylindrical surface steel plate rolled on the rolling machine, as shown in Figure 3 (a, b);

[0029] 4) Assembling the adjustable pitch propeller skeleton: Place the contour envelope cross-section templates for the radii of 0.2R, 0.25R, 0.3R, 0.4R, 0.5R, 0.6R, 0.7R, 0.8R, 0.9R, and 0.95R of each cross-section on the platform according to the radius, height, and pitch angle (R, H, θ°) of each cross-section, and connect the contour envelope cross-section templates with round steel to form the adjustable pitch propeller blade skeleton;

[0030] 5) Filling: Fill the mixture between two adjacent contour envelope cross-section templates, as shown in Figure 4 ;

[0031] 6) Shaping: Scrape and smooth the upper and lower surfaces of the mixture filled between the contour envelope cross-section templates to form a stainless steel adjustable pitch propeller solid sample blade mold. The fillets of the pressure surface and suction surface of the stainless steel adjustable pitch propeller solid sample blade mold are filled with the mixture. The raw materials of the mixture include 20 - 30% by weight of wood chips 2, 60 - 70% of gypsum 3, 5 - 10% of palm fur 4, 1 - 5% of steel bars 1, and the balance of water. Then, weld and assemble the stainless steel adjustable pitch propeller solid sample blade mold and the flange solid sample mold into a whole through the reserved welding points, as shown in

[0032] The steel skeleton is inside the flange solid sample mold, and wooden blocks are inlaid on the outside. Place the assembled whole mold in a sand box and ramming sand directly; open the box and take out the whole mold; close the box and bake until pouring; open the box, cut off the riser, grind, polish, color, and perform non-destructive flaw detection to obtain the required blade, and the diameter of the blade is greater than 6 m.

[0033] Then, weld and assemble the stainless steel adjustable pitch propeller solid sample blade mold and the flange solid sample mold into a whole through the reserved welding points, as shown in Figure 5 ; Place the assembled whole mold in a sand box and ramming sand directly; open the box and take out the whole mold; close the box and bake until pouring; open the box, cut off the riser, grind, polish, color, and perform non-destructive flaw detection to obtain the required blade, and the diameter of the blade is greater than 6 m.

Claims

1. A method for preparing a large stainless steel controlled pitch propeller blade mold, characterized in that: The preparation method is as follows: 1) Lofting of controllable pitch propeller section template: Loft out the conformal section template of each section radius and wrap it around the cylindrical surface of each section radius; 2) Rolling section sample steel plate: Use stainless steel plate to roll out cylindrical steel plate on the plate rolling machine according to the radius of each section; 3) Milling section template: The cylindrical steel plate rolled out on the plate rolling machine is milled out on the milling machine to produce the contour envelope section template of each section radius; 4) Assembling the controllable pitch propeller skeleton: placing the conformal envelope section templates of each section radius on the platform according to the section radius, height and pitch angle, and connecting the conformal envelope section templates with round steel to form the controllable pitch propeller skeleton; 5) Filling: Fill the mixture between two consecutive envelope section specimens; 6) Shaping: Scrape the upper and lower surfaces of the mixture filled between the profiled envelope section templates, and smoothen them to form a stainless steel adjustable pitch propeller blade mold.

2. The method for preparing a large stainless steel controlled pitch propeller blade mold according to claim 1, characterized in that: The stainless steel adjustable pitch propeller blade sample mold and the flange sample mold are welded and assembled into a whole through reserved welding points.

3. The method for preparing a large stainless steel controlled pitch propeller blade mold according to claim 2, characterized in that: The fillets of the pressure surface and the suction surface of the stainless steel variable pitch propeller blade sample mold are filled with a mixed material.

4. The method for preparing a large stainless steel controlled pitch propeller blade mold according to claim 2, characterized in that: The flange sample mold has a steel frame inside and wooden blocks outside.

5. The method for preparing a large stainless steel controlled pitch propeller blade mold according to claim 1, characterized in that: The thickness of the stainless steel plate is 4-6 mm.

6. The method for preparing a large stainless steel controlled pitch propeller blade mold according to claim 1, characterized in that: The raw materials of the mixture include 20-30% of sawdust, 60-70% of gypsum, 5-10% of palm fur, 1-5% of steel bars and the balance of water in terms of weight percentage.

7. The method for preparing a large stainless steel controlled pitch propeller blade sample mold according to claim 1, characterized in that: The diameter of the blades prepared by the stainless steel adjustable pitch propeller sample blade mold is greater than 6m.

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