A machining fixture and machining method for blade fixing block assembly

Abstract

This invention discloses a machining fixture for blade fixing block assemblies, comprising: a fixture body with a first annular groove on a first end face for clamping and fixing the blade fixing block assemblies; and a slot for connection to a machine tool on a second end face of the fixture body; and a pressure plate connected to the fixture body for further fixing the blade fixing block assemblies. The machining method includes: positioning and clamping the blade fixing block assemblies within the first annular groove of the fixture body; pressing the pressure plate onto the fixture body after its second annular groove mates with the blade fixing block assemblies; hammering all the fixing blocks of the blade fixing block assemblies against the first and second inner surfaces and wedging them with wedges; tightening the fixture body and pressure plate with bolts; and machining the blade fixing block assemblies by connecting to the machine tool through the slot. This invention's machining fixture solves the problems of positioning, clamping, and fixing the blade fixing block assemblies, enabling machining of the blade fixing block assemblies and ensuring their machining accuracy.

Description

Technical Field

[0001] This invention relates to the field of blade fixing block assembly processing technology, and in particular to a processing fixture and processing method for blade fixing block assemblies. Background Technology

[0002] Blade fixing block assembly, such as Figure 1 and Figure 2 As shown, this is one of many parts that fix the rotor blades of a compressor. Because there are many parts that fix the blades and the assembly dimensional chain requires high precision, the blade fixing block assembly is considered a machined part within the overall assembly dimensional chain to ensure the accuracy of the assembly dimensional chain and to guarantee smooth assembly of the blades. The blade fixing block assembly is a semi-circular part that is machined from a whole circle and then cut into several parts. If all parts can be installed smoothly after being cut from the whole circle, no further fitting is needed. If they cannot be installed smoothly, their outer circle becomes the assembly surface, requiring fitting machining. Furthermore, it is crucial to ensure that the outer circle of each small piece is machined uniformly, which is quite challenging to achieve.

[0003] The previous processing method was to use a grinding wheel to grind the outer circle, which resulted in uneven material removal and affected the assembly quality.

[0004] Most of the parts are difficult to machine, firstly because ensuring uniform material removal from each half is challenging, and secondly because maintaining their positional relationship with other surfaces is crucial. To meet these requirements and ensure assembly quality, machining methods are essential.

[0005] Since the fixed block assembly is a multi-semi-disc type part that is cut from a whole circle, only a well-designed tooling fixture can guarantee that such multi-semi-disc parts can be machined on a machine tool. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0007] Therefore, a first aspect of the present invention provides a machining fixture for blade fixing blocks.

[0008] A second aspect of the present invention provides a method for machining a blade fixing block assembly using the above-described blade fixing block assembly machining fixture.

[0009] In view of this, a machining fixture for a blade fixing block assembly is provided according to a first aspect of the embodiments of this application, comprising:

[0010] The fixture body has a first annular groove on its first end face, which is used for clamping and fixing the blade fixing block assembly. The second end face of the fixture body has a slot for connecting to the machine tool.

[0011] The pressure plate is connected to the main body of the clamp and is used to further fix the blade fixing block assembly.

[0012] In one feasible implementation, the first inner side and the first bottom surface of the first annular groove are mating surfaces with the blade fixing block assembly, and the first outer side of the first annular groove is the assembly surface of the blade fixing block assembly.

[0013] In one feasible implementation, the first inner surface and the first bottom surface are fitted with the blade fixing block assembly with a small clearance of H7 / g6, and the first outer surface is fitted with the blade fixing block assembly with a large clearance of 0.5 to 0.7 mm.

[0014] In one feasible implementation, a through hole is provided at the center of the fixture body, and a boss is provided on the third end face of the pressure plate. The through hole and the boss are fitted with a small clearance of H7 / g6.

[0015] In one feasible implementation, a second annular groove is provided on the third end face of the pressure plate, the second inner side and the second bottom side of the second annular groove are mating surfaces with the blade fixing block assembly, and the second outer side of the second annular groove is the assembly surface of the blade fixing block assembly.

[0016] In one feasible implementation, the second inner surface and the second bottom surface are fitted with the blade fixing block assembly with a small clearance of H7 / g6, and the second outer surface is fitted with the blade fixing block assembly with a large clearance of 0.5 to 0.7 mm.

[0017] In one feasible implementation, a wedge block is also included to ensure that the blade fixing block assembly remains circumferentially stable during processing.

[0018] In one feasible implementation, the wedge taper is 1:15 to 1:20.

[0019] In one feasible implementation, both the fixture body and the pressure plate are disc-shaped. After the blade fixing block assembly is assembled with the fixture body and the pressure plate, the outer peripheral surface of the blade fixing block assembly protrudes from the outer peripheral surface of the fixture body and the pressure plate by a radial dimension of 2 to 5 mm.

[0020] According to a second aspect of the embodiments of this application, a method for machining a blade fixing block assembly using the above-described blade fixing block assembly machining fixture is provided, comprising:

[0021] The blade fixing block assembly is positioned and clamped in the first annular groove of the fixture body;

[0022] After the second annular groove of the pressure plate is engaged with the blade fixing block assembly, it is pressed onto the fixture body;

[0023] All the fixing blocks of the blade fixing block group are knocked to the first inner side and the second inner side and pressed together, and then wedged tightly with the wedge block;

[0024] Secure the fixture body and the pressure plate with bolts;

[0025] The blade fixing block assembly is machined by connecting it to the machine tool through the slot.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] The machining fixture for the blade fixing block assembly of the present invention solves the problems of positioning, clamping and fixing of the blade fixing block assembly, realizes the machining of the blade fixing block assembly and ensures the machining accuracy of the blade fixing block assembly. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is a schematic diagram of the blade fixing block assembly structure provided by the present invention.

[0030] Figure 2 Provided by the present invention Figure 1 Enlarged BB cross-sectional view of the blade fixing block assembly.

[0031] Figure 3 This is a schematic diagram of the fixture body provided in an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the structure of the pressure plate provided in an embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of the wedge block provided in an embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of the machining fixture assembly for the blade fixing block assembly provided in an embodiment of the present invention.

[0035] Figure 7 This is a partial schematic diagram of the assembly of the machining fixture for the blade fixing block assembly provided in an embodiment of the present invention.

[0036] The correspondence between the reference numerals and the component names is as follows:

[0037] 1. Fixture body; 101. First annular groove; 102. Slot; 103. Through hole; 1011. First inner side surface; 1012. First bottom surface; 1013. First outer side surface; 2. Pressure plate; 201. Second annular groove; 2011. Second inner side surface; 2012. Second bottom surface; 2013. Second outer side surface; 3. Wedge block; 4. Bolt. Detailed Implementation

[0038] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0039] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," 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 unit 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.

[0041] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] See appendix Figures 1-7 A machining fixture for blade fixing blocks, comprising:

[0043] The fixture body 1 has a first annular groove 101 on its first end face, which is used for clamping and fixing the blade fixing block assembly. The fixture body 1 also has a slot 102 on its second end face for connecting to the machine tool.

[0044] The pressure plate 2 is connected to the fixture body 1 and is used to further fix the blade fixing block assembly.

[0045] The machining fixture for the blade fixing block assembly in this embodiment of the invention solves the problems of positioning, clamping and fixing of the blade fixing block assembly. The blade fixing block assembly forms a cut circle, realizing the machining of the blade fixing block assembly and ensuring the machining accuracy of the blade fixing block assembly.

[0046] In one feasible implementation, the first inner side surface 1011 and the first bottom surface 1012 of the first annular groove 101 are mating surfaces with the blade fixing block assembly, and the first outer side surface 1013 of the first annular groove 101 is the assembly surface of the blade fixing block assembly.

[0047] Specifically, the main body of the fixture 1 is a disc-shaped part. Through the cooperation and assembly of the machining fixture and the blade fixing block assembly, it can not only ensure that the outer diameter of the blade fixing block assembly is uniform during the machining process, but also ensure the positional relationship between the outer diameter (i.e., the outer circumferential surface) of the blade fixing block and other parts.

[0048] In one feasible implementation, the first inner surface 1011 and the first bottom surface 1012 are fitted with the blade fixing block assembly with a small clearance of H7 / g6, and the first outer surface 1013 is fitted with the blade fixing block assembly with a large clearance of 0.5 to 0.7 mm.

[0049] Specifically, the purpose of the large clearance fit is to facilitate assembly. Because the blade fixing block assembly consists of several small blocks, and there are many of these small blocks, when they are installed on the first annular groove 101 of the fixture body 1, there will be an inward-outward movement. The large clearance fit between the first outer surface 1013 and the blade fixing block assembly facilitates assembly. The small clearance fit is to ensure installation accuracy and machining accuracy. By machining the fixture and the blade fixing block assembly themselves with their respective accuracy, as well as the installation accuracy of the mating surfaces between them, it is possible not only to ensure that the outer diameter of the blade fixing block assembly is uniformly reduced during machining, but also to ensure the positional relationship between the outer diameter and other parts.

[0050] In one feasible implementation, a through hole 103 is provided at the center of the fixture body 1, and a boss 202 is provided on the third end face of the pressure plate 2. The through hole 103 and the boss 202 are fitted with a small clearance of H7 / g6.

[0051] Specifically, the through hole 103 and the boss 202 adopt a small clearance fit of H7 / g6 to further ensure the fit accuracy between the fixture body 1 and the pressure plate 2, and to ensure the machining accuracy of the blade fixing block assembly.

[0052] In one feasible embodiment, a second annular groove 201 is provided on the third end face of the pressure plate 2. The second inner side surface 2011 and the second bottom surface 2012 of the second annular groove 201 are mating surfaces with the blade fixing block assembly, and the second outer side surface 2013 of the second annular groove 201 is the assembly surface of the blade fixing block assembly. The second inner side surface 2011 and the second bottom surface 2012 are fitted with the blade fixing block assembly with a small clearance of H7 / g6, and the second outer side surface 2013 is fitted with the blade fixing block assembly with a large clearance of 0.5 to 0.7 mm.

[0053] Specifically, the pressure plate 2 is also a disc-shaped part. Since the blade fixing block assembly is relatively high in the direction of the lathe rotation center, in order to ensure that the blade fixing block assembly does not tilt under the action of cutting force during the machining process and thus avoid large dimensional deviations, the end face of the pressure plate 2 also has the same positioning ring groove as the fixture body 1. The second inner side 2011 and the second bottom side 2012 of the second ring groove 201 of the pressure plate 2 are mating surfaces with the blade fixing block assembly. In order to ensure accuracy, the mating surfaces are H7 / g6 small clearance fit, and the second outer side 2013 is a large clearance fit with the blade fixing block assembly for easy assembly.

[0054] In one feasible embodiment, a wedge 3 is also included to ensure that the blade fixing block assembly remains circumferentially stable during processing. The taper of the wedge 3 is 1:15 to 1:20.

[0055] Specifically, since all the blade fixing blocks are not perfectly round after assembly, in order to ensure that the fixing block assembly does not move in the circumferential direction during processing, several wedges with a taper of 1:15 to 1:20 are needed to wedge them tightly.

[0056] In one feasible implementation, both the fixture body 1 and the pressure plate 2 are disc-shaped. After the blade fixing block assembly is assembled on the fixture body 1 and the pressure plate 2, the radial dimension of the outer peripheral surface of the blade fixing block assembly protruding from the outer peripheral surface of the fixture body 1 and the pressure plate 2 is 2 to 5 mm.

[0057] Specifically, because the blade fixing block assembly is a semi-circular part cut from a whole circle, the fixture body 1 is disc-shaped, and the pressure plate 2 is also disc-shaped. Furthermore, the radial distance between the first annular groove 101 of the fixture body 1 and the outer periphery of the fixture body 1 is equal to the radial distance between the second annular groove 201 of the pressure plate 2 and the outer periphery of the pressure plate 2. To facilitate machining the outer circle (i.e., the outer circumferential surface) of the blade fixing block assembly, after the fixture body 1 and pressure plate 2 are assembled with the blade fixing block assembly, the radial dimension of the outer circumferential surface of the blade fixing block assembly protruding from the outer circumferential surface of the fixture body 1 and pressure plate 2 is 2-5 mm. Figure 7 The distance d is 2-5 mm.

[0058] According to a second aspect of the embodiments of this application, a method for machining a blade fixing block assembly using the above-described blade fixing block assembly machining fixture is provided, comprising:

[0059] The blade fixing block assembly is positioned and clamped in the first annular groove 101 of the fixture body 1;

[0060] After the second annular groove 201 of the pressure plate 2 is engaged with the blade fixing block assembly, it is pressed onto the fixture body 1.

[0061] All the fixing blocks of the blade fixing block group are knocked to the first inner side 1011 and the second inner side 2011 and pressed together, and then wedged with wedge 3.

[0062] Secure the fixture body 1 and the pressure plate 2 with bolts;

[0063] The blade fixing block assembly is machined by connecting it to the machine tool through the slot 102.

[0064] Specifically, since the fixture body 1, pressure plate 2, and fixing block assembly 3 all have large clearance fits, their assembly is relatively convenient. After the blade fixing block assembly is assembled with the fixture body 1 and pressure plate 2, without tightening the bolts 4, use a copper hammer to knock all the fixing blocks close to the first inner side 1011 and the second inner side 2011, and simultaneously wedge them together. At this point, the relative position of the blade fixing block assembly and the tooling fixture is fixed.

[0065] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A machining fixture for a blade fixing block assembly, characterized in that, include: The fixture body (1) has a first annular groove (101) on its first end face. The first annular groove (101) is used for clamping and fixing the blade fixing block assembly. The fixture body (1) has a slot (102) for connecting to the machine tool on its second end face. The pressure plate (2) is connected to the clamp body (1) and is used to further fix the blade fixing block assembly; The first inner side (1011) and the first bottom surface (1012) of the first annular groove (101) are mating surfaces with the blade fixing block assembly, and the first outer side (1013) of the first annular groove (101) is the assembly surface of the blade fixing block assembly; the first inner side (1011) and the first bottom surface (1012) are fitted with the blade fixing block assembly with a small clearance of H7 / g6, and the first outer side (1013) is fitted with the blade fixing block assembly with a large clearance of 0.5~0.7mm; The pressure plate (2) has a second annular groove (201) on its third end face. The second inner side (2011) and the second bottom side (2012) of the second annular groove (201) are mating surfaces with the blade fixing block assembly. The second outer side (2013) of the second annular groove (201) is the assembly surface of the blade fixing block assembly. The second inner side (2011) and the second bottom side (2012) are fitted with the blade fixing block assembly with a small clearance of H7 / g6. The second outer side (2013) is fitted with the blade fixing block assembly with a large clearance of 0.5~0.7mm. The machining fixture also includes a wedge (3) to ensure that the blade fixing block assembly remains circumferentially stable during machining. The blade fixing block assembly is a semi-circular part that has been machined from a whole circle and then cut into pieces.

2. The machining fixture for the blade fixing block assembly according to claim 1, characterized in that, The fixture body (1) has a through hole (103) at its center and a boss (202) on the third end face of the pressure plate (2). The through hole (103) and the boss (202) are fitted with a small clearance of H7 / g6.

3. The machining fixture for the blade fixing block assembly according to claim 1, characterized in that, The taper of the wedge (3) is 1:15 to 1:

20.

4. The machining fixture for the blade fixing block assembly according to claim 1, characterized in that, Both the fixture body (1) and the pressure plate (2) are disc-shaped. After the blade fixing block group is assembled with the fixture body (1) and the pressure plate (2), the radial dimension of the outer peripheral surface of the blade fixing block group protruding from the outer peripheral surface of the fixture body (1) and the pressure plate (2) is 2~5mm.

5. A method for machining a blade fixing block assembly using a machining fixture according to any one of claims 1 to 4, characterized in that, include: The blade fixing block assembly is positioned and clamped in the first annular groove (101) of the fixture body (1); After the second annular groove (201) of the pressure plate (2) is engaged with the blade fixing block assembly, it is pressed onto the fixture body (1); All the fixing blocks of the blade fixing block group are knocked to the first inner side (1011) and the second inner side (2011) and pressed together, and wedged with the wedge (3); Secure the clamp body (1) and the pressure plate (2) with bolts; The blade fixing block assembly is machined by connecting it to the machine tool through the slot (102).

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