A positioning fixture for machining mounting holes on a rudder frame shaft

Abstract

This utility model discloses a positioning fixture for machining mounting holes on a rudder frame shaft, comprising: positioning pins, a pressure plate, a guide sleeve, and a base plate; the rudder frame to be machined is placed on the base plate; several positioning pins are fixedly installed on the base plate to restrict the degrees of freedom of the rudder frame; the pressure plate is installed above the rudder frame to press it firmly against the base plate; the guide sleeve is fixedly installed on the base plate to guide the drilling head. This utility model optimizes the machining scheme through positioning fixtures, has high operability, improves product position accuracy and hole diameter accuracy, and greatly improves production efficiency for mass production.

Description

Technical Field

[0001] This utility model relates to a positioning fixture for machining mounting holes on a rudder frame shaft, belonging to the field of machining technology. Background Technology

[0002] The rudder frame is made of 05Cr17Ni4Cu4Nb material and has an overall skeletal structure. A typical rudder frame has an outer envelope size of 537mm*238mm*347mm. The rudder frame and rudder assembly require high precision, with tolerances mostly around (+0.1 / +0.05). The front pivot hole is approximately... The rear pivot hole is approximately The overall hole depth is 375mm, and it is not easy to guarantee the coaxiality and concentricity of the front and rear holes to 0.05mm.

[0003] Based on the product's structural characteristics, high dimensional accuracy, and performance requirements, the product blanks are made of die forgings / free forgings, and all surfaces of the parts are machined to ensure accuracy.

[0004] The existing processing method involves leaving multiple process blocks around the part for machining, and then pressing these blocks together before proceeding with the final machining. This method is difficult to position and align, resulting in low processing efficiency. While the processing time for a single part may not differ significantly, it is noticeably slower compared to batch production. See the attached document for specific part details. Figure 1 . Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned defects and provide a positioning fixture for machining the mounting holes of the rudder frame shaft. This invention solves the technical problems of difficult positioning and alignment and low machining efficiency in the existing machining of the mounting holes of the rudder frame shaft. This invention optimizes the machining scheme through positioning fixture, has strong operability, improves the product position accuracy and hole diameter accuracy, and greatly improves the production efficiency for mass production products.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0007] A positioning fixture for machining mounting holes on a rudder frame includes: a positioning pin, a pressure plate, a guide sleeve, and a base plate;

[0008] The rudder frame to be processed is placed on the base plate;

[0009] Several locating pins are fixedly installed on the base plate to restrict the degrees of freedom of the rudder frame;

[0010] The pressure plate is installed above the rudder frame, pressing the rudder frame tightly against the base plate;

[0011] The guide sleeve is fixedly installed on the base plate and is used to guide the drilling head.

[0012] Furthermore, the upper surface of the base plate matches the shape of the lower surface of the rudder frame, and when the rudder frame to be processed is placed on the base plate, the upper surface of the base plate fits into the lower surface of the rudder frame.

[0013] Furthermore, the number of locating pins is greater than or equal to 4.

[0014] Furthermore, the locating pins fixed to the base plate fit snugly against the outline of the window inside the rudder frame.

[0015] Furthermore, the pressure plate comprises several sub-plates;

[0016] At least one subplate is mounted on the outside of the front shaft mounting hole of the rudder frame.

[0017] Furthermore, the sub-board is a rectangular board.

[0018] Furthermore, the guide sleeve has a through hole, and the guide sleeve is located at the front shaft mounting hole to be machined on the rudder frame. The through hole is coaxial with the rear shaft mounting hole that has been machined on the rudder frame. The drilling head drills into the rudder frame through the through hole to complete the drilling of the front shaft mounting hole.

[0019] Furthermore, it also includes a mounting base;

[0020] The guide sleeve is fixedly installed on the base plate using the mounting bracket.

[0021] Furthermore, the axial dimension of the guide sleeve is 20–25 mm.

[0022] Furthermore, the mounting base is secured to the base plate by clamping screws.

[0023] Compared with the prior art, the present invention has at least one of the following advantages:

[0024] (1) This utility model optimizes the processing scheme through positioning tooling, which is highly operable and improves the product position accuracy and hole size accuracy, which greatly improves the production efficiency for mass production products.

[0025] (2) The positioning fixture of this utility model restricts the degree of freedom of the product in all directions, which can effectively improve the processing accuracy of the product;

[0026] (3) The present invention is designed with a guide sleeve, which can avoid the displacement of the drilling position caused by the bending of the long drilling cutter head, and can complete coaxial drilling quickly and reliably. Attached Figure Description

[0027] Figure 1 Schematic diagram of the rudder frame product;

[0028] Figure 2 This is a schematic diagram of the tooling of this utility model;

[0029] Figure 3This is a schematic diagram of the positioning pin being installed in this utility model;

[0030] Figure 4 This is a schematic diagram of the product being installed according to the present invention;

[0031] Figure 5 This is a schematic diagram of the guide sleeve and mounting base of this utility model;

[0032] Figure 6 This is a schematic diagram of the pressing product of this utility model;

[0033] Figure 7 This is a reference diagram showing the processing position of this utility model;

[0034] Figure 8 The drawings are of the curved surface tooling of this utility model; (a) and (b) are side views in different directions, (c) is a partial view, and (d) is an overall view;

[0035] Figure 9 This is a drawing of the guide sleeve for this utility model;

[0036] Figure 10 The drawings are of the mounting base of this utility model, wherein (a) is a sectional view, (b) is a side view, and (c) is a top view. Detailed Implementation

[0037] The features and advantages of this utility model will become clearer and more explicit through the following detailed description.

[0038] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0039] The rudder frame product processing solution is mature and reliable, and has undergone multiple processing verifications in the past. This optimization only focuses on the machining process of the pivot mounting holes. The rudder frame 1 is a delta airfoil structure with a width of 238mm. The airfoil surface has a tapered, gradually thickening design and a rectangular weight-reduction window in the middle. For the pivot hole machining, a detailed process design and analysis were conducted. Before machining, a custom-made fixture was used to tightly fit the rudder frame airfoil surface. To ensure the accuracy and geometric tolerances of the pivot mounting holes, a one-time clamping machining method was adopted. A curved fixture (base plate) 2 was fabricated to fit tightly against the bottom curved surface of the product. The fixture's shape can be straightened and aligned, and a machining zero point can be set. Due to the large hole depth during machining, a guide sleeve 5 was fabricated and connected to the mounting base 6 to the curved fixture 2 to guide the front pivot hole 8, ensuring the product's positional accuracy and hole size requirements. See details. Figure 2 Tooling diagram.

[0040] This utility model positioning fixture mainly utilizes the close fit between the bottom arc surface of the product and the fixture to restrict its freedom of movement in the height direction. Before inserting the product, the positioning pins 4 (four in total) are installed, which restricts the product's freedom of movement in the front-back and left-right directions. See the attached document for details. Figure 3 .

[0041] The method of using this utility model tooling includes:

[0042] 1) Mount the product onto the curved fixture 2, aligning the inner window outline of the product with the four locating pins. See attached document for details. Figure 4 ;

[0043] 2) Install the guide sleeve 5 and the mounting base 6 into the tooling, as shown in the appendix. Figure 5 and Figure 7 ;

[0044] 3) Press the workpiece firmly with pressure plate 3. See the attached document for details. Figure 6 ;

[0045] 4) After clamping the workpiece, check whether the state is stable, then straighten and align it. Use a locator to find the zero point of processing, and then production processing can begin.

[0046] Example:

[0047] The parts drawings for the positioning fixture are as follows: pressure plate 3, positioning pin 4, and clamping screw 7 are standard parts, and their dimensions can be adjusted according to processing requirements.

[0048] For specific dimensions of the curved surface tooling, please refer to [reference needed]. Figure 8 For specific dimensions of the guide sleeve, please refer to [the relevant documentation]. Figure 9 For specific dimensions of the mounting bracket, please refer to [link / reference]. Figure 10 .

[0049] The design of this tooling optimizes the product processing technology. By using tooling for fixed processing, the product can be accurately positioned, its freedom of movement can be fully constrained, the impact of workers' skill level on the product can be reduced, processing efficiency can be improved, and processing costs can be reduced.

[0050] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present invention without departing from the spirit and scope of the present invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0051] The contents not described in detail in this utility model specification are common knowledge to those skilled in the art.

Claims

1. A positioning tool for rudder skeleton pivot mounting hole processing, characterized in that, include: Positioning pin (4), pressure plate (3), guide sleeve (5) and base plate (2); The rudder frame to be processed is placed on the base plate (2); Several positioning pins (4) are fixedly installed on the base plate (2) to limit the degrees of freedom of the rudder frame; The pressure plate (3) is installed above the rudder frame to press the rudder frame tightly onto the base plate (2); The guide sleeve (5) is fixedly installed on the base plate (2) and is used to guide the drilling head.

2. The positioning tool for machining the rudder stock frame pivot mounting hole according to claim 1, characterized in that, The upper surface of the base plate (2) matches the shape of the lower surface of the rudder frame. When the rudder frame to be processed is placed on the base plate (2), the upper surface of the base plate (2) fits against the lower surface of the rudder frame.

3. The positioning tool for machining the rudder stock frame pivot mounting hole according to claim 1, characterized in that, The number of locating pins (4) is greater than or equal to 4.

4. The positioning tool for machining the pivot mounting hole of the rudder skeleton according to claim 1, characterized in that, Each positioning pin (4) fixed on the base plate (2) fits into the outline of the window inside the rudder frame.

5. The positioning tool for machining the pivot mounting hole of the rudder skeleton according to claim 1, characterized in that, The pressure plate (3) includes several sub-plates; At least one subplate is mounted on the outside of the front shaft mounting hole of the rudder frame.

6. The positioning tool for machining the pivot mounting hole of the rudder stock assembly according to claim 5, wherein The sub-board is a rectangular board.

7. The positioning tool for machining the pivot mounting hole of the rudder stock assembly according to claim 1, wherein The guide sleeve (5) is provided with a through hole. The guide sleeve (5) is located at the front shaft mounting hole to be machined on the rudder frame. The through hole is coaxial with the rear shaft mounting hole that has been machined on the rudder frame. The drilling head drills into the rudder frame through the through hole to complete the drilling of the front shaft mounting hole.

8. A positioning fixture for machining mounting holes on a rudder frame shaft according to claim 7, characterized in that, It also includes a mounting base (6); The guide sleeve (5) is fixedly installed on the base plate (2) by the mounting bracket (6).

9. The positioning tool for machining the pivot mounting hole of the rudder stock assembly according to claim 7, wherein The axial dimension of the guide sleeve (5) is 20-25mm.

10. The positioning tool for machining the pivot mounting hole of the rudder skeleton according to claim 8, characterized in that, The mounting base (6) is fixed to the base plate (2) by clamping screws (7).

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