A general-purpose drilling tool for steam turbine blade forgings

Abstract

This application provides a universal drilling tool for steam turbine blade forgings, including a drilling template, a support and positioning part, and a telescopic base plate. The support and positioning part is located at both ends of the telescopic base plate, and includes a blade root support and a blade crown support. The distance between the blade root support and the blade crown support changes with the telescopic movement of the telescopic base plate. The drilling template is located on both sides of the telescopic base plate, outside the blade root support and the blade crown support. A drill sleeve is provided on the drilling template and is embedded within it. The universal drilling tool for steam turbine blade forgings provided by this application can be used to drill forgings of different lengths and models. This allows for the processing of forgings without changing the blade drilling tool after processing a product; simply adjusting the length of the telescopic base plate is sufficient to process the forgings, thus improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of drilling tools, and more particularly to a general-purpose drilling tool for steam turbine blade forgings. Background Technology

[0002] When producing steam turbine forged blades, in order to facilitate the machining of the forgings into blades, it is usually necessary to drill a center hole in the forgings to find the center axis of the blades for subsequent machining, so as to evenly distribute the machining allowance of each part.

[0003] To facilitate drilling on forgings (at both ends), traditional drilling processes employ drill bits. These bits are used to hold the forging in place for drilling. However, these drill bits are typically designed for single-blade types and cannot be adjusted for different blade lengths. This means that after completing one product, the drill bit must be replaced, and the product reassembled, resulting in significant time consumption, production delays, and low efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a universal drilling tool for turbine blade forgings, which solves the technical problem that traditional special drilling tools cannot be adjusted according to different model lengths, resulting in the need to replace the blade drilling tool and reassemble it according to the new product after processing one product, which consumes a lot of time, delays the production schedule, and has low production efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a universal drilling tool for steam turbine blade forgings, the universal drilling tool for steam turbine blade forgings comprising:

[0006] Retractable base plate;

[0007] A support and positioning part is provided at both ends of the retractable base plate. The support and positioning part includes a blade root support seat and a blade crown support seat. The distance between the blade root support seat and the blade crown support seat changes with the extension and retraction movement of the retractable base plate.

[0008] A drilling template is provided on both sides of the retractable base plate. The drilling template is located outside the blade root support and the blade crown support. A drill sleeve is provided on the drilling template and is embedded in the drilling template.

[0009] In one embodiment, the retractable base plate includes:

[0010] The lower base plate is provided with a sliding groove;

[0011] The upper base plate is provided with a guide key, which is slidably engaged in the groove of the lower base plate. A locking threaded part is provided between the lower base plate and the upper base plate. The blade root support and the blade crown support are respectively provided on the upper base plate and the lower base plate.

[0012] In one embodiment, the upper base plate is slidably disposed on the upper surface of the lower base plate, and a first pad is disposed at the bottom of the upper base plate, the thickness of the first pad being the same as the thickness of the lower base plate.

[0013] In one embodiment, the blade root support and the upper base plate, as well as the blade crown support and the lower base plate, are connected by threaded components.

[0014] In one embodiment, the support positioning part further includes a tightening bolt. Both the blade root support and the blade crown support are provided with slots. The forging to be drilled is installed and fitted in the slots. The tightening bolt is provided on the blade root support and the blade crown support, and the tightening bolt is used to lock the forging in the slots.

[0015] In one embodiment, the blade root support has the same shape as the blade crown support. The slot in the blade root support includes a first positioning surface, a second positioning surface, and a buffer relief groove. The first positioning surface is an inclined surface, and the second positioning surface is a vertical surface. The included angle between the first positioning surface and the second positioning surface is the same as the included angle between the two sides of the end of the forging. The buffer relief groove is disposed at the intersection of the first positioning surface and the second positioning surface.

[0016] In one embodiment, a first boss is provided on the top of the first positioning surface, and a second boss is provided on the top of the second positioning surface. The tightening bolts are provided on both the first boss and the second boss. The tightening bolts act on two sides of the end of the forging, and the two sides on which the tightening bolts act are different from the sides that mate with the first positioning surface and the second positioning surface.

[0017] In one embodiment, at least two adjusting bolts are provided on the second positioning surface.

[0018] In one embodiment, the drilling template includes:

[0019] A leaf root drilling template is disposed on the retractable base plate on the side near the leaf root support.

[0020] A blade root drill sleeve is disposed on the blade root drill template;

[0021] A leaf crown drill template is disposed on the retractable base plate on the side near the leaf crown support seat;

[0022] A crown drill sleeve is disposed on the crown drill template.

[0023] In one embodiment, the leaf root drill template and the leaf crown drill template are made of 45 steel, and the leaf root drill sleeve and the leaf crown drill sleeve are made of tungsten steel.

[0024] The above-described technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0025] The universal drilling tool for turbine blade forgings provided in this invention features a support and positioning section on a telescopic base plate. The blade root support and blade crown support within this section fix the blade root and crown positions of the forging, respectively. A drilling template located on the outer side of the blade root and crown support accurately positions the drilling holes, enabling precise drilling on the forging (at both the blade root and crown positions). Furthermore, when drilling forgings of different lengths is required, the telescopic base plate can be adjusted to accommodate different forging lengths. This allows the drilling tool to be used on forgings of varying lengths without needing to change the drilling tool after completing a product; simply adjusting the length of the telescopic base plate is sufficient for further processing, thus improving production efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a universal drilling tool for turbine blade forgings provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of a universal drill tool for clamping turbine blade forgings according to an embodiment of the present invention;

[0029] Figure 3 for Figure 2 Front view of a general-purpose drilling tool for steam turbine blade forgings;

[0030] Figure 4 This is a schematic diagram of the structure of the crown support provided in an embodiment of the present invention.

[0031] The labels for the various figures are as follows:

[0032] 1. Telescopic base plate; 2. Support and positioning part; 4. Forging; 11. Lower base plate; 12. Upper base plate; 13. First pad; 14. Second pad; 21. Blade root support seat; 22. Blade crown support seat; 23. Tightening bolt; 24. Adjusting bolt; 31. Blade root drill template; 32. Blade root drill sleeve; 33. Blade crown drill template; 34. Blade crown drill sleeve; 111. Slide groove; 221. Slot; 222. First boss; 223. Second boss; 2211. First positioning surface; 2212. Second positioning surface; 2213. Buffer relief groove. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Please see Figures 1 to 4This application provides a universal drilling tool for turbine blade forgings, including a drilling template, a support and positioning part 2, and a telescopic base plate part 1. The support and positioning part 2 is located at both ends of the telescopic base plate part 1, and includes a blade root support 21 and a blade crown support 22. The distance between the blade root support 21 and the blade crown support 22 changes with the telescopic movement of the telescopic base plate part 1. The drilling template is located on both sides of the telescopic base plate part 1, outside the blade root support 21 and the blade crown support 22. A drill sleeve is provided on the drilling template and is embedded within the drilling template.

[0038] The universal drilling tool for turbine blade forgings 4 provided in this embodiment utilizes a support and positioning part 2 on a telescopic base plate 1. The blade root support 21 and blade crown support 22 within the support and positioning part 2 fix the blade root and blade crown positions of the forging 4, respectively. Then, a drilling template located on the outside of the blade root support 21 and blade crown support 22 accurately positions the drilling position, thereby achieving accurate drilling on the forging 4 (blade root and blade crown positions). Furthermore, when drilling forgings 4 of different lengths is required, only the telescopic base plate 1 needs to be adjusted to suit the length of the forging 4. This allows the drilling tool to be used for drilling forgings 4 of different lengths. Consequently, after processing one product, there is no need to change the blade drilling tool; simply adjusting the length of the telescopic base plate 1 is sufficient to process the forging 4, improving production efficiency.

[0039] In one embodiment, the retractable base plate 1 includes a lower base plate 11 and an upper base plate 12. The lower base plate 11 is provided with a sliding groove 111; the upper base plate 12 is provided with a guide key, which is slidably engaged with the sliding groove 111 of the lower base plate 11. A locking threaded component is provided between the lower base plate 11 and the upper base plate 12. The blade root support 21 and the blade crown support 22 are respectively disposed on the upper base plate 12 and the lower base plate 11. The lower base plate 11 and the upper base plate 12 are connected by the sliding engagement of the guide key and the sliding groove 111, so that the upper base plate 12 can be slidably disposed on the lower base plate 11. This allows the distance between the blade root support 21 and the blade crown support 22 on the lower base plate 11 and the upper base plate 12 to be adjusted according to the length of the forging 4 (the length of the forging 4 varies for different types of blades) to accommodate drilling of different types of forgings 4.

[0040] In addition, a threaded part (specifically a screw) can be provided between the lower base plate 11 and the upper base plate 12 to lock the upper base plate 12 and the lower base plate 11. When it is necessary to adjust the position of the base plate and the upper base plate 12, the threaded part between them can be loosened for adjustment.

[0041] In one embodiment, the upper base plate 12 is slidably disposed on the upper surface of the lower base plate 11, and a first pad 13 is disposed at the bottom of the upper base plate 12. The thickness of the first pad 13 is the same as the thickness of the lower base plate 11 (so that the bottom surface of the first pad 13 and the bottom surface of the lower base plate 11 are at the same horizontal plane). The first pad 13 can be made of 45# steel. By setting the first pad 13, the drill bit is more stable when placed on a horizontal plane.

[0042] In one embodiment, the blade root support 21 and the upper base plate 12, as well as the blade crown support 22 and the lower base plate 11, are connected by threaded fittings. By using threaded fittings (specifically screws) to connect the blade root support 21 and the upper base plate 12, and the blade crown support 22 and the lower base plate 11, when the blade root support 21 or the blade crown support 22 is damaged and needs to be replaced, the blade root support 21 or the blade crown support 22 can be quickly replaced simply by loosening the threaded fittings, making drill bit maintenance more convenient.

[0043] like Figure 2-3 As shown, in one embodiment, the support positioning part 2 further includes a tightening bolt 23. Both the blade root support 21 and the blade crown support 22 are provided with slots 221. The forging 4 to be drilled is installed and fitted into the slots 221. The tightening bolt 23 is provided on the blade root support 21 and the blade crown support 22, and is used to lock the forging 4 within the slots 221. After the forging 4 is fitted into the slots 221 of the support, the forging 4 is positioned by the slots 221. Then, by tightening the tightening bolt 23, the forging 4 is firmly fixed to the support, preventing it from loosening during drilling.

[0044] like Figure 4As shown, in one embodiment, the blade root support 21 and the blade crown support 22 have the same shape. The slot 221 in the blade root support 21 includes a first positioning surface 2211, a second positioning surface 2212, and a buffer relief groove 2213. The first positioning surface 2211 is an inclined surface, and the second positioning surface 2212 is a vertical surface. The included angle between the first positioning surface 2211 and the second positioning surface 2212 is the same as the included angle between the two sides of the end of the forging 4. The buffer relief groove 2213 is disposed at the intersection of the first positioning surface 2211 and the second positioning surface 2212. When it is necessary to install the forging 4 into the slot 221, the bottom inclined surface of the forging 4 is first attached to the first positioning surface 2211, and then slid down along the first positioning surface 2211 under the action of gravity until the vertical side of the forging 4 contacts and abuts against the second positioning surface 2212, thereby realizing the positioning of the forging 4. When installing forging 4, the downward-sloping first positioning surface 2211 serves both a positioning and guiding function. Utilizing the positioning functions of the first positioning surface 2211 and the second positioning surface 2212, forging 4 can be accurately and quickly installed into the predetermined position on the support base. Then, the forging 4 is positioned and fixed by tightening the bolts 23.

[0045] The buffer relief groove 2213 is set at the intersection of the first positioning surface 2211 and the second positioning surface 2212, so that when the forging 4 is fitted into the slot 221, the bottom corner of the forging 4 is not likely to hit the intersection of the first positioning surface 2211 and the second positioning surface 2212. At the same time, it avoids the forging 4 from being unable to fully fit into the slot 221 due to the conflict between the bottom corner of the forging 4 and the intersection of the first positioning surface 2211 and the second positioning surface 2212.

[0046] like Figure 4 As shown, in one embodiment, a first boss 222 is provided on the top of the first positioning surface 2211, and a second boss 223 is provided on the top of the second positioning surface 2212. Tightening bolts 23 are provided on both the first boss 222 and the second boss 223. The tightening bolts 23 act on two sides of the end of the forging 4, and the two sides on which the tightening bolts 23 act are different from the sides that cooperate with the first positioning surface 2211 and the second positioning surface 2212. By setting a first boss 222 and a second boss 223, and setting tightening bolts 23 on the first boss 222 and the second boss 223 respectively, when the forging 4 is fitted into the slot 221, the tightening bolts 23 on the first boss 222 and the second boss 223 can respectively provide clamping force to the other two sides of the forging 4 (the forging 4 generally includes 4 sides, and its cross-section is quadrilateral), while the remaining two sides of the forging 4 are tightly attached to the first positioning surface 2211 and the second positioning surface 2212 respectively, thereby firmly fixing the forging 4.

[0047] Optionally, the direction of the locking force applied by the tightening bolt 23 to the forging 4 can be set to be perpendicular to the first positioning surface 2211 / second positioning surface 2212, so that the locking force applied by the tightening bolt 23 to the forging 4 will not cause the forging 4 to be subjected to torque force, thereby avoiding the forging 4 from being twisted and deformed due to the locking force applied by the tightening bolt 23 to the forging 4.

[0048] like Figure 4 As shown, in one embodiment, at least two adjusting bolts 24 are provided on the second positioning surface 2212. The ends of the adjusting bolts 24 are of the same length, and the adjusting bolts 24 can be adjusted according to the cross-sectional dimensions of different models of forgings 4, thereby replacing the positioning function of the second positioning surface 2212 and making the application range of the drilling tool wider.

[0049] In one embodiment, the drilling template includes a crown drill sleeve 34, a root drill sleeve 32, a crown drill template 33, and a root drill template 31. The root drill template 31 is disposed on the retractable base plate 1 near the root support 21. The root drill sleeve 32 is disposed on the root drill template 31. The crown drill template 33 is disposed on the retractable base plate 1 near the crown support 22. The crown drill sleeve 34 is disposed on the crown drill template 33. The drill sleeves can position the drilling location to ensure accuracy. In one embodiment, the root drill template 31 and the crown drill template 33 are made of 45# steel, and the root drill sleeve 32 and the crown drill sleeve 34 are made of tungsten steel. Tungsten steel has the advantages of high hardness and wear resistance, thus preventing the drill sleeves from wearing out too quickly.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A universal drilling tool for steam turbine blade forgings, characterized in that, The general-purpose drilling tool for turbine blade forgings includes: Retractable base plate; A support and positioning part is provided at both ends of the retractable base plate. The support and positioning part includes a blade root support seat and a blade crown support seat. The distance between the blade root support seat and the blade crown support seat changes with the extension and retraction movement of the retractable base plate. A drilling template is provided on both sides of the retractable base plate. The drilling template is located outside the blade root support and the blade crown support. A drill sleeve is provided on the drilling template and is embedded in the drilling template. The support and positioning part also includes a tightening bolt. Both the blade root support and the blade crown support are provided with a slot. The forging to be drilled is installed and fitted in the slot. The tightening bolt is provided on the blade root support and the blade crown support. The tightening bolt is used to lock the forging in the slot. The blade root support has the same shape as the blade crown support. The slot in the blade root support includes a first positioning surface, a second positioning surface, and a buffer relief groove. The first positioning surface is an inclined surface, and the second positioning surface is a vertical surface. The included angle between the first positioning surface and the second positioning surface is the same as the included angle between the two sides of the end of the forging. The buffer relief groove is located at the intersection of the first positioning surface and the second positioning surface. The first positioning surface is provided with a first boss at the top, and the second positioning surface is provided with a second boss at the top. The first boss and the second boss are each provided with a tightening bolt. The tightening bolts act on two sides of the end of the forging, and the two sides on which the tightening bolts act are different from the sides that mate with the first positioning surface and the second positioning surface. At least two adjusting bolts are provided on the second positioning surface.

2. The universal drilling tool for steam turbine blade forgings according to claim 1, characterized in that, The retractable base plate includes: The lower base plate is provided with a sliding groove; The upper base plate is provided with a guide key, which is slidably engaged in the groove of the lower base plate. A locking threaded part is provided between the lower base plate and the upper base plate. The blade root support and the blade crown support are respectively provided on the upper base plate and the lower base plate.

3. A universal drilling tool for steam turbine blade forgings according to claim 2, characterized in that: The upper base plate is slidably disposed on the upper surface of the lower base plate, and a first pad is disposed at the bottom of the upper base plate, the thickness of the first pad being the same as the thickness of the lower base plate.

4. A universal drilling tool for steam turbine blade forgings according to claim 2, characterized in that: The blade root support and the upper base plate, as well as the blade crown support and the lower base plate, are connected by threaded parts.

5. A universal drilling tool for steam turbine blade forgings according to claim 1, characterized in that, The drilling template includes: A leaf root drilling template is disposed on the retractable base plate on the side near the leaf root support. A blade root drill sleeve is disposed on the blade root drill template; A leaf crown drill template is disposed on the retractable base plate on the side near the leaf crown support seat; A crown drill sleeve is disposed on the crown drill template.

6. A universal drilling tool for steam turbine blade forgings according to claim 5, characterized in that: The leaf root drill template and the leaf crown drill template are made of No. 45 steel, and the leaf root drill sleeve and the leaf crown drill sleeve are made of tungsten steel.

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