Three-way pipe multifunctional clamping and positioning device and three-way pipe machining method

Abstract

The invention provides a multifunctional clamping and positioning device for a three-way pipe and a three-way pipe machining method, and relates to the field of aero-engine part machining. The device comprises a clamp body provided with a T-shaped groove and a positioning part, multiple sets of vertically-distributed threaded holes are formed in the bottom and the side wall of the T-shaped groove, and accurate positioning of the three-way pipe is achieved through cooperation of a compression screw and a positioning pin. The positioning component comprises a cylindrical positioning pin, a conical head positioning screw and a cylindrical positioning block connected with the conical head positioning screw, and the combination mode can be replaced according to different machining procedures. The limitation that a traditional four-jaw chuck is low in clamping efficiency and prone to deformation is broken through, two working procedures share the same clamp body through the modular positioning system, repeated alignment is not needed during clamping, the position precision and size consistency of three-way pipe type thin-wall special-shaped parts are effectively guaranteed, and the production efficiency and the product quality stability are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of the production of aero-engine components, and particularly to a multi-functional clamping and positioning device for a tee pipe and a processing method for the tee pipe. Background Art

[0002] The tee pipe part has a relatively complex structure and high product precision requirements. As a connecting component for precision parts of aero-engines, it has multiple important key functions. The material specification of this part is a die forging, which belongs to an irregular special-shaped part. The problem of clamping and alignment has always been a technical difficulty for this type of part. Whether the positioning is accurate directly affects the processing quality of the subsequent product.

[0003] Currently, the traditional four-jaw chuck is usually used to clamp and align the parts. However, the four-jaw chuck has the following disadvantages when clamping parts: 1. In terms of clamping operation, the four jaws of the four-jaw chuck move independently and need to be adjusted separately. The clamping process is cumbersome and the clamping time is long, which seriously affects the production efficiency in mass production. 2. In terms of clamping accuracy, the four-jaw chuck has poor repeat positioning accuracy for parts. The clamping force is concentrated at four points, and the clamping force is uneven or too large, which easily causes deformation of thin-walled or poorly rigid parts. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-functional clamping and positioning device for a tee pipe and a processing method for the tee pipe, so as to provide a device that is convenient to use, has high positioning accuracy, strong versatility, and can be used repeatedly for tee pipe parts. It reduces the labor intensity, shortens the auxiliary alignment time, thereby improving the production efficiency, better ensuring the product quality, and facilitating the later customization of standardized management.

[0005] The present invention is realized by the following technical solutions: A multi-functional clamping and positioning device for a tee pipe, including a fixture main body and a positioning component. One end face of the fixture main body is a clamping end, a clamping groove is arranged on the clamping end, a threaded hole is arranged at the bottom of the clamping groove, and two groups of through threaded holes are arranged on the side wall of the clamping groove. The two groups of threaded holes are arranged perpendicular to each other. Each group of threaded holes includes two threaded holes, and the two threaded holes are respectively arranged on opposite sides of the clamping groove. There are multiple positioning components, and the positioning components cooperate with the threaded holes on the clamping groove to fix the part to be processed. The part to be processed includes two mutually parallel and coaxial surfaces to be processed and a surface to be processed that is perpendicular to these two surfaces and located between these two surfaces. Among them, the two mutually parallel and coaxial surfaces to be processed respectively correspond to the outer circle A and the outer circle C of the part to be processed, and the surface to be processed that is perpendicular to these two surfaces and located between these two surfaces corresponds to the outer circle B of the part to be processed 3.

[0006] Further, the clamping groove is a T-shaped groove, and the T-shaped groove includes two mutually connected cavities with different sizes.

[0007] Further, the positioning components include a compression screw and a positioning pin. The compression screw clamps the outer surface of the part to be machined to achieve fastening, and the positioning pin shaft is inserted into the machined hole on the end face of the part to be machined to limit the coaxiality and position accuracy of the part.

[0008] Further, the compression screw includes a first compression screw and a second compression screw. The second compression screw has two and is respectively connected to the threaded holes on both sides of the T-shaped groove. The two sides of the part to be machined are clamped by the second compression screw. The first compression screw is arranged in the threaded hole perpendicular to the threaded hole of the second compression screw, and the unmachined end face of the part to be machined is pressed by the first compression screw.

[0009] Further, the positioning pin includes a cylindrical positioning pin, a cylindrical positioning block and a positioning pin shaft. The cylindrical positioning block is arranged at the top of the tapered head positioning screw and is matched with the threaded hole through the tapered head positioning screw. The cylindrical positioning pin is arranged at the bottom of the clamping groove, and the cylindrical positioning block and the positioning pin shaft are arranged on the side wall of the clamping groove.

[0010] A processing method for a three-way pipe includes the following steps: S1, Clamp the outer circle A end of the part to be machined by a conventional fixture, machine the forming surface of the outer circle C end, drill a through hole, and then rough and finish machine the outer circle and inner hole; S2, After fixing the fixture body, place the part to be machined into the T-shaped groove of the fixture body, clamp and position it, and then machine the end face, outer circle and inner hole forming surface of the outer circle A end of the part to be machined; S3, Position and fix by the outer circle A and the outer circle C, rough machine the end face and outer circle of the outer circle B end, then drill holes in sequence, rough machine the inner hole, and then finish machine the end face, outer circle and inner hole forming surface.

[0011] Further, in step S2, the positioning components use the first compression screw, the second compression screw and the cylindrical positioning pin. The cylindrical positioning pin is arranged in the threaded hole at the bottom of the clamping groove and is inserted into the inner hole of the outer circle C end, and the first compression screw presses the end face of the outer circle B.

[0012] Further, in step S3, the positioning components use the second compression screw, the cylindrical positioning block and the positioning pin shaft. The cylindrical positioning block is inserted into the inner hole of the outer circle A end, the positioning pin shaft is inserted into the inner hole of the outer circle C end, the cylindrical positioning block presses the outer circle A end through the tapered head positioning screw, and the outer circle C end is positioned with the end face of the side wall of the clamping groove.

[0013] The beneficial effects of the multi-functional clamping and positioning device for a three-way pipe and the processing method for a three-way pipe according to the present invention include: By reasonably selecting the positioning reference and designing a multi-functional device, the new device realizes two functions. Only by adjusting some components can the same tooling be used for clamping in two different processes. The new device no longer needs to measure and align the center of each part. After clamping the part according to the clamping steps, the product can be processed. This multi-functional invention device is convenient and fast to clamp, can be repeatedly positioned and clamped, the clamping force of the product is more concentrated, and it is not easy to cause stress deformation of the product. It can be used as a high-precision fixture for turning parts such as three-way pipes of aero-engines to ensure the position accuracy of the machined surface after re-clamping and the machined surface. It not only improves production efficiency and reduces production costs, but most importantly, by designing this device, the product size consistency is better and the product quality can be better guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. The drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0015] Figure 1 It is a schematic structural diagram of a positioning device of the present invention; Figure 2 It is a schematic structural diagram of a second positioning device of the present invention; Figure 3 It is an assembly schematic diagram of the first positioning device and the part to be machined; Figure 4 It is an assembly schematic diagram of the second positioning device and the part to be machined; Figure 5 It is a schematic structural diagram of the part to be machined; Figure 6 It is a schematic structural diagram of the part to be machined after being processed by step S1; Figure 7 It is a schematic structural diagram of the part to be machined after being processed by step S2; Figure 8 It is a schematic structural diagram of the part to be machined after being processed by step S3; In the figure, 1.1 - the first compression screw, 1.2 - the T-shaped groove, 1.3 - the second compression screw, 1.4 - the cylindrical positioning pin, 2.1 - the tapered head positioning screw, 2.2 - the cylindrical positioning block, 2.3 - the positioning pin shaft, 3 - the part to be machined, 3.1 - the outer circle A, 3.2 - the outer circle B, 3.3 - the outer circle C. DETAILED DESCRIPTION OF THE INVENTION

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0018] As Figure 1-8 shown, a multi-functional clamping and positioning device for a three-way pipe and a processing method for a three-way pipe include a positioning device one and a positioning device two. The main structures of the positioning device one and the positioning device two remain unchanged, but only some of the positioning components are replaced to achieve multiple uses of one tooling. The processing fixture is used to clamp the part to be processed 3. The part to be processed includes an outer diameter A 3.1, an outer diameter B 3.2, and an outer diameter C 3.3.

[0019] T-shaped grooves 1.2 are provided on the fixture main bodies of the positioning device one and the positioning device two. The part to be processed 3 is placed in the T-shaped grooves 1.2. The T-shaped grooves 1.2 are composed of two communicating cavities of different sizes. Threaded holes are provided in the four directions of up, down, left, and right and at the bottom of the T-shaped grooves 1.2. By inserting different positioning components into the threaded holes, the part to be processed 3 in different processing states can be clamped. The positioning device one and the positioning device two are respectively used to clamp the part to be processed 3 in two different processing states. Since the main structures of the positioning device one and the positioning device two are the same, in fact, different positioning components can also be replaced on the same fixture main body to clamp the part to be processed 3 in different processing states. However, considering actual situations such as production efficiency, in this embodiment, two positioning devices are used to clamp the part to be processed 3 in two different processing states respectively.

[0020] The positioning components on the positioning device one include a pressing screw one 1.1, a pressing screw two 1.3, and a cylindrical positioning pin 1.4. The pressing screw one 1.1 is connected to the threaded hole above the T-shaped groove 1.2. There are two pressing screws two 1.3 which are respectively connected to the threaded holes on the left and right sides of the T-shaped groove 1.2. The cylindrical positioning pin 1.4 is connected to the threaded hole at the bottom of the T-shaped groove 1.2.

[0021] The specific operation is as follows: Place the part 3 to be processed into the T-slot 1.2 of the fixture body, ensure that there is a clearance fit between the inner hole of the part and the cylindrical surface of the cylindrical locating pin 1.4 to ensure the coaxiality and positional tolerance of the product, and then tighten the first compression screw 1.1 and the second compression screw 1.3 with a hexagonal wrench to fix the part and prevent it from rotating. The outer circle B3.2 end of the part 3 to be processed is located at the upper end of the T-slot 1.2. The inner hole of the outer circle C3.3 end is mated with the cylindrical locating pin 1.4 to limit the coaxiality and positional tolerance of the part. After the end face of the part is positioned with the end face of the T-slot 1.2, use the second compression screw 1.3 to compress both sides of the part 3 to be processed, and then use the first compression screw 1.1 to compress the outer circle B3.2 end of the part 3 to be processed. After ensuring that the part is in a clamped state, the part can be machined.

[0022] The positioning components on the second positioning device include the second compression screw 1.3, the tapered head positioning screw 2.1, the cylindrical positioning block 2.2, and the positioning pin shaft 2.3. The second compression screw 1.3 is the same as that in the first positioning device, there are two and they are respectively connected to the threaded holes on the left and right sides of the T-slot 1.2. The tapered head positioning screw 2.1 is connected to the threaded hole above the T-slot 1.2. The positioning pin shaft 2.3 is arranged to be connected to the threaded hole below the T-slot 1.2. The cylindrical positioning block 2.2 is mated with the tapered head positioning screw 2.1.

[0023] Place the part 3 to be processed into the T-slot 1.2 of the fixture body. There is a support clearance fit between the inner hole at the upper end of the part and the cylindrical surface of the cylindrical positioning block 2.2. The upper end of the cylindrical positioning block 2.2 is designed with a tapered surface that is fixedly mated with the tapered surface of the tapered head positioning screw 2.1. The inner hole of the lower end part is in clearance fit with the cylindrical surface of the positioning pin shaft 2.3 to ensure the coaxiality and positional tolerance of the part. Then tighten the second compression screw 1.3 and the tapered head positioning screw 2.1 with a hexagonal wrench to fix the part and prevent it from rotating.

[0024] The specific operation is as follows: Place the part 3 to be processed into the T-slot 1.2. At the lower end, the inner hole of the outer circle C3.3 end is in clearance fit with the cylindrical surface of the positioning pin shaft 2.3 for positioning, and the end face of the part is positioned with the bottom end face of the T-slot 1.2. At the upper end, install the cylindrical positioning block 2.2 into the inner hole of the outer circle A3.1 for support and positioning, then tighten the tapered head positioning screw 2.1 so that its tapered surface is fixedly mated with the upper tapered surface of the cylindrical positioning block 2.2. Finally, use the second compression screw 1.3 to compress both sides of the part 3 to be processed to ensure that the part is in a clamped state.

[0025] The processing method of the three-way pipe using this positioning tooling specifically includes the following steps: S1. Use soft jaws to clamp the outer circle A3.1 end of the part 3 to be processed, machine the forming surface of the outer circle C3.3 end, drill a through hole, and then rough and finish machine the outer circle and inner hole; S2. After placing the part 3 to be machined into the positioning device one for clamping and positioning and fixing, machine the end face, outer circle and inner hole forming surface of the outer circle A3.1 end of the part 3 to be machined. S3. Clamp the part 3 to be machined onto the positioning device two, and position and fix it through the outer circle A3.1 and the outer circle C3.3. Rough machine the end face and outer circle of the outer circle B3.2 end, then drill holes in sequence, rough machine the inner hole, and then finish machine the end face, outer circle and inner hole forming surface.

[0026] Previously, the operator used three-jaw and four-jaw chucks to clamp the parts, and used shims and plugs to align each product by dial indicator. It was necessary to continuously adjust and verify whether the parts met the requirements. The repeat positioning accuracy of the parts was poor. In addition, this type of part was irregular and belonged to special-shaped thin-walled parts. It was difficult for the operator to master the clamping force during clamping and fixing, and there were often phenomena such as uneven or excessive clamping force resulting in product deformation and scrapping.

[0027] In this application, by reasonably selecting the positioning reference and designing a multi-functional device, the new device realizes two functions. Only by adjusting some components can the same tooling be used for clamping in two different processes. The new device no longer needs to align the center of each part by dial indicator. After clamping the part according to the clamping steps, the product can be machined. This multi-functional invention device is convenient and fast to clamp, can be repeatedly positioned and clamped multiple times, the clamping force of the product is more concentrated, and it is not easy to cause stress deformation of the product. It can be used as a high-precision fixture for turning parts of aero-engine three-way pipes to ensure the position accuracy of the machined surface and the machined surface after re-clamping. It not only improves production efficiency and reduces production costs, but most importantly, by designing this device, the product size consistency is better and the product quality can be better guaranteed.

[0028] In the above embodiments, the basic principles, main features and advantages of the present invention are described. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, any changes and modifications made by those skilled in the art that do not depart from the spirit and scope of the present invention should fall within the protection scope of the appended claims of the present invention.

Claims

1. A multifunctional clamping and positioning device for a three-way pipe, characterized in that: The invention comprises a fixture body and a positioning component, wherein one end face of the fixture body is a clamping end, the clamping end is provided with a clamping groove, the bottom of the clamping groove is provided with a threaded hole, and the side wall of the clamping groove is provided with two groups of through threaded holes, the two groups of threaded holes are arranged perpendicular to each other, each group of threaded holes comprises two threaded holes, the two threaded holes are respectively arranged on two opposite sides of the clamping groove, the positioning component has a plurality of positioning components, and the positioning components cooperate with the threaded holes on the clamping groove to achieve the fixation of the part to be processed (3), the part to be processed (3) comprises two mutually parallel and coaxial to-be-processed surfaces and a to-be-processed surface which is perpendicular to the two surfaces and located between the two surfaces, wherein the two mutually parallel and coaxial to-be-processed surfaces respectively correspond to the outer circle A (3.1) and the outer circle C (3.3) of the part to be processed (3), and the to-be-processed surface which is perpendicular to the two surfaces and located between the two surfaces corresponds to the outer circle B (3.2) of the part to be processed 3.

2. A three-way pipe multifunctional clamping and positioning device according to claim 1, characterized in that: The clamping groove is a T-shaped groove (1.2), and the T-shaped groove (1.2) comprises two cavities, one large and one small, which are connected to each other.

3. The multifunctional clamping and positioning device for a three-way pipe according to claim 1 is characterized in that: The positioning component comprises a clamping screw and a positioning pin, the clamping screw clamps the outer surface of the part to be processed (3) to achieve fastening, and the positioning pin is inserted into a hole processed on the end surface of the part to be processed (3) to limit the coaxiality and position of the part.

4. The multifunctional clamping and positioning device for a three-way pipe according to claim 3 is characterized in that: The clamping screw comprises a clamping screw 1 (1.1) and a clamping screw 2 (1.3), wherein the clamping screw 2 (1.3) has two threaded holes respectively connected to the two sides of the T-slot (1.2), and the two sides of the part to be processed (3) are clamped by the clamping screw 2 (1.3). The clamping screw 1 (1.1) is arranged in a threaded hole perpendicular to the threaded hole of the clamping screw 2 (1.3), and the unprocessed end surface of the part to be processed (3) is compressed by the clamping screw 1 (1.1).

5. The multifunctional clamping and positioning device for a three-way pipe according to claim 3 is characterized in that: The locating pin comprises a cylindrical locating pin (1.4), a cylindrical locating block (2.2) and a locating pin shaft (2.3), wherein the cylindrical locating block (2.2) is arranged at the top of a cone head locating screw (2.1) and cooperates with the threaded hole through the cone head locating screw (2.1), the cylindrical locating pin (1.4) is arranged at the bottom of the clamping groove, and the cylindrical locating block (2.2) and the locating pin shaft (2.3) are arranged on the side wall of the clamping groove.

6. A three-way pipe processing method is implemented by a three-way pipe multifunctional clamping and positioning device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, clamp the outer circle A (3.1) end of the part to be processed (3) by a conventional fixture, process the forming surface of the outer circle C (3.3) end, drill through the hole, and then rough and fine process the outer circle and inner hole; S2, after fixing the fixture body, placing the part to be processed (3) into the T-slot (1.2) of the fixture body, clamping and positioning it, and processing the end face, outer circle and inner hole forming surface of the outer circle A (3.1) end of the part to be processed (3); S3, through the positioning and fixing of the outer circle A (3.1) and the outer circle C (3.3), the end face and outer circle of the outer circle B (3.2) are rough-machined, and then holes are drilled and the inner hole is rough-machined in sequence, and then the outer circle of the end face and the inner hole forming surface are fine-machined.

7. A three-way pipe multifunctional clamping and positioning device according to claim 6, characterized in that: In step S2, the positioning component uses a clamping screw 1 (1.1), a clamping screw 2 (1.3) and a cylindrical positioning pin (1.4). The cylindrical positioning pin (1.4) is arranged in a threaded hole at the bottom of the clamping groove and inserted into the inner hole at the end of the outer circle C (3.3). The clamping screw 1 (1.1) clamps the end surface of the outer circle B (3.2).

8. The multifunctional clamping and positioning device for a three-way pipe according to claim 6, characterized in that: In step S3, the positioning components use a clamping screw 2 (1.3), a cylindrical positioning block (2.2) and a positioning pin (2.3); the cylindrical positioning block (2.2) is inserted into the inner hole of the end of the outer circle A (3.1); the positioning pin (2.3) is inserted into the inner hole of the end of the outer circle C (3.3); the cylindrical positioning block (2.2) is clamped on the end of the outer circle A (3.1) by a cone-head positioning screw (2.1); and the end of the outer circle C (3.3) is positioned with the end face of the side wall of the clamping groove.

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