Special tool for conical thin-walled pipe parts and using method

Abstract

The invention discloses a special tool for conical thin-walled tube parts in the technical field of tools, which comprises a tool core rod, one end of the tool core rod is provided with a center hole, the tool core rod comprises a first threaded section and a second threaded section, a cone is arranged between the first threaded section and the second threaded section, the first threaded section is provided with a first nut, and the second threaded section is provided with a second nut. And a second nut is arranged on the second threaded section. According to the scheme, the conical thin-walled pipe part can be conveniently clamped and machined.

Description

Technical Field

[0001] The present invention relates to the technical field of tooling, and in particular to a special tooling for tapered thin-walled tube parts and a use method thereof. Background Art

[0002] A steam generator, also known as a steam heat source machine (commonly known as a boiler), is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into hot water or steam. A steam generator is one of the core equipment of a nuclear power plant. Conical thin-walled tube parts are an important component of a steam generator. Their inner cavity is a "conical surface + elliptical surface", which is not easy to clamp. There are grooves in the outer diameter, and the walls are locally thin, which is easy to deform during processing. All of these factors cause certain difficulties in mechanical processing. If the mechanical processing plan is not appropriate, the performance of the parts will not meet the requirements, posing a safety hazard. In summary, the cold machining of conical thin-walled tube parts is also an important part of ensuring the safety of nuclear power plants. It must be given sufficient attention. Otherwise, it will bury nuclear safety hazards and pose a major threat to people's lives and property safety. Summary of the Invention

[0003] The present invention aims to provide a special tooling for tapered thin-walled tube parts and a method of use thereof, so as to solve the problems that existing tapered thin-walled tube parts are difficult to clamp and process.

[0004] A special tool for tapered thin-walled tube parts in this solution includes a tooling mandrel, one end of which is provided with a center hole, the tooling mandrel including a first threaded segment and a second threaded segment, a vertebral body is provided between the first threaded segment and the second threaded segment, a first nut is provided on the first threaded segment, and a second nut is provided on the second threaded segment.

[0005] The working principle and beneficial effects of this solution are as follows: when in use, the conical thin-walled tube part is sleeved and fitted on the cone of the tooling mandrel, and the conical thin-walled tube part is clamped by using the first nut and the second nut. Before the conical thin-walled tube part is installed on the tooling mandrel, the tooling mandrel needs to be installed on the machine tool and the cone on the tooling mandrel is processed to reduce the error caused by the tooling mandrel. The conical thin-walled tube part is loaded into the tooling mandrel and fixed firmly, and then the end face and shape are processed.

[0006] Furthermore, a pressure plate is provided on the second threaded section, and the pressure plate is located between the first nut and the second nut. The pressure plate is provided to make the clamping more stable.

[0007] Furthermore, the diameter of the first thread segment is larger than that of the second thread segment, and the first thread segment is connected to a cylinder.

[0008] The invention discloses a method for using a special tool for tapered thin-walled tube parts, which includes semi-finishing turning and finishing turning.

[0009] Furthermore, the semi-finishing turning includes the following steps: the inner hole of the tapered thin-walled tube part is a tapered hole and an elliptical hole, the elliptical hole is close to the end of the tapered thin-walled tube part with a larger diameter, and the tapered hole is close to the end of the tapered thin-walled tube part with a smaller diameter. The end of the tapered thin-walled tube part with a larger diameter is called the big head end, and the end with a smaller diameter is called the small head end. S1: clamp the outer circle of the big head end, push the inner hole of the small head end, align the allowances at all places to be uniform, and then clamp; S2: turn the outer circle of the small head end, the diameter is greater than φ220, the length is about 50, which is enough to install the center frame; S3: install the center frame, withdraw the center, calibrate, and ensure that the tightness is appropriate; S4: flatten the end face of the small head end, taking into account The subsequent allowances on the back of the step and the end face of the large head are uniform and sufficient; S5: Turn the tapered hole of the small head end; S6: Top the center hole of the small head end and loosen the center frame; S7: Turn the outer circle, groove and The back of the step and the rounded corners; S8: Turn the head, clamp the outer circle of the small head end, lean against the flat end face, and install the center frame; S9: Flatten the end face of the large head end; S10: Turn the tapered hole to connect with the front tool; S11: Turn the outer circle of the large head end.

[0010] Furthermore, the precision turning includes the following steps: S1: clamping the outer diameter of the small head end, using a liner, with appropriate clamping force, preventing deformation and paying attention to cooling, pushing the inner hole of the large head end, aligning the allowances at all locations to be uniform, and then clamping; S2: polishing the outer diameter of the small head end near the groove with a diameter greater than φ216 and a length of about 50, which is sufficient for installing a center frame, with a Ra6.3; S3: installing the center frame, retracting the center, and calibrating to ensure appropriate tightness; S4: flattening the end face of the large head end, ensuring that the allowances at both ends are consistent, with a Ra6.3; S5: Programming and turning 1 / 4 oval hole and inner hole, turning through, ensuring the size and position requirements shown in the figure, Ra1.6; S6: Polishing the oval hole, Ra1.6; S7: Install the tooling mandrel into the spindle taper hole of the machine tool, and fix the mandrel firmly with the first nut; S8: Polish the cone of the tooling mandrel, ensuring that the runout is less than 0.005, Ra1.6; S9: Install the tapered thin-walled tube parts into the mandrel, and fix it with the pressure plate and the second nut; S10: Flatten the end face of the small head to ensure the total length Ra6.3; S11: Program the car shape to ensure the size and position requirements shown in the figure, pay attention to cooling, Ra6.3; S12: Use the first nut to push the part out of the core rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the structure of the tapered thin-walled tube parts in the present invention;

[0012] Figure 2 This is a structural schematic diagram of a special tooling for tapered thin-walled tube parts according to the present invention;

[0013] Figure 3 for Figure 2 Exploded diagram. DETAILED DESCRIPTION

[0014] The following is a further detailed description through specific implementation methods:

[0015] The reference numerals in the drawings of the specification include: tapered thin-walled tube part 1, cylinder 2, first nut 3, pressure plate 4, second nut 5, second threaded segment 6, center hole 7, first threaded segment 8, and vertebral body 9.

[0016] The embodiment is basically as shown in the attached Figures 1 to 3 As shown: A special tool for tapered thin-walled tube parts, including a tool mandrel, one end of which is provided with a center hole 7, the tool mandrel including a first thread segment 8 and a second thread segment 6, a vertebral body 9 is provided between the first thread segment 8 and the second thread segment 6, a first nut 3 is provided on the first thread segment 8, a second nut 5 is provided on the second thread segment 6, and a pressure plate 4 is also provided on the second thread segment 6, the pressure plate 4 is located between the first nut 3 and the second nut 5, the diameter of the first thread segment 8 is larger than that of the second thread segment 6, and the first thread segment 8 is fixedly connected to the cylinder 2.

[0017] A method for using special tooling for tapered thin-walled tube parts, including a) review of start-up documents, b) inspection of raw materials, c) forging, d) rough machining, e) ultrasonic testing, f) performance heat treatment, g) line sampling, h) physical and chemical testing, i) semi-finishing, j) ultrasonic testing, k) finishing, l) marking, m) visual inspection, n) dimensional inspection, o) liquid penetrant testing, p) cleaning, packaging, and q) review of completion report.

[0018] According to the above process flow, the cold machining process "k finishing" mainly involved in the tooling of the present invention is produced and manufactured. "K finishing" includes two processes: semi-finishing turning and finishing turning:

[0019] ① For semi-finishing turning, it can be carried out on the CY-K660 CNC lathe. The process is as follows:

[0020] The inner hole of the tapered thin-walled tube part 1 is a tapered hole and an elliptical hole. The elliptical hole is close to the end of the tapered thin-walled tube part 1 with a larger diameter, and the tapered hole is close to the end of the tapered thin-walled tube part 1 with a smaller diameter. The end of the tapered thin-walled tube part 1 with a larger diameter is called the large head end, and the end with a smaller diameter is called the small head end.

[0021] Semi-finishing turning includes the following steps: the inner hole of the tapered thin-walled tube part 1 is a tapered hole and an elliptical hole, the elliptical hole is close to the end of the tapered thin-walled tube part 1 with a larger diameter, the tapered hole is close to the end of the tapered thin-walled tube part 1 with a smaller diameter, and the end of the tapered thin-walled tube part 1 with a larger diameter is called the big head end. Figure 1 The right end of the middle part, the end with smaller diameter becomes the small end. Figure 1At the left end of the machine, S1: clamp the outer circle of the large head end, push the inner hole of the small head end, and after aligning the allowances at all places to be uniform, clamp it; S2: turn the outer circle of the small head end, with a diameter greater than φ220 and a length of about 50, which is enough to install the center frame; S3: Install the center frame, withdraw the center, calibrate, and ensure that the tightness is appropriate; S4: flatten the end face of the small head end, taking into account the subsequent allowances of the back of the φ step and the end face of the large head end to be uniform and sufficient; S5: turn the tapered hole of the small head end; S6: push the center hole 7 of the small head end, loosen the center frame; S7: turn the outer circle, groove, back of the φ step, and chamfer of the small head end; S8: turn around, clamp the outer circle of the small head end, flatten the end face, and install the center frame; S9: flatten the end face of the large head end; S10: turn the tapered hole to connect with the front tool; S11: turn the outer circle of the large head end;

[0022] ② For fine turning, it can be carried out on the CY-K660 CNC lathe. The process is as follows:

[0023] Precision turning includes the following steps: S1: Clamp the outer circle of the small head end, use a liner, clamp with appropriate clamping force, prevent deformation and pay attention to cooling, push the inner hole of the large head end, align the allowances at all places, and clamp; S2: Polish the outer circle of the small head end near the groove with a diameter greater than φ216 and a length of about 50, which is enough to install the center frame, Ra6.3; S3: Install the center frame, withdraw the center, calibrate, and ensure appropriate tightness; S4: Flatten the end face of the large head end, taking into account the allowances at both ends, Ra6.3; S5: Program and turn the 1 / 4 elliptical hole and the inner hole, turn through, and ensure the size and position requirements shown in the figure, Ra 1.6; S6: Polish the elliptical hole, Ra1.6; S7: Install the tooling mandrel into the spindle taper of the machine tool, and fix the mandrel firmly with the first nut 3; S8: Smooth the cone 9 of the tooling mandrel to ensure that the runout is less than 0.005, Ra1.6; S9: Install the tapered thin-walled tube part 1 into the mandrel, and fix it with the pressing plate 4 and the second nut 5; S10: Flatten the end face of the small head to ensure the total length, Ra6.3; S11: Program the car shape to ensure the illustrated size and position requirements, pay attention to cooling, Ra6.3; S12: Use the first nut 3 to push the part out of the mandrel.

[0024] Practice has proved that the tooling is reasonable, feasible and efficient, and the tapered thin-walled tube parts 1 produced by using the tooling can meet the requirements.

[0025] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A special tool for tapered thin-walled tube parts, characterized by: It comprises a tooling mandrel, one end of which is provided with a center hole, the tooling mandrel comprises a first thread segment and a second thread segment, a cone is provided between the first thread segment and the second thread segment, a first nut is provided on the first thread segment, and a second nut is provided on the second thread segment.

2. The special tooling for tapered thin-walled tube parts according to claim 1, characterized in that: A pressing plate is also provided on the second thread segment, and the pressing plate is located between the first nut and the second nut.

3. The special tooling for tapered thin-walled tube parts according to claim 2, characterized in that: The diameter of the first thread segment is greater than that of the second thread segment, and the first thread segment is connected to a cylinder.

4. The method for using the special tooling for tapered thin-walled tube parts according to claim 3 is characterized in that: Including semi-finishing turning and finishing turning.

5. The method for using the special tooling for tapered thin-walled tube parts according to claim 4, characterized in that: The semi-finishing turning comprises the following steps: the inner hole of the tapered thin-walled tube part is a tapered hole and an elliptical hole, the elliptical hole is close to the end of the tapered thin-walled tube part with a larger diameter, and the tapered hole is close to the end of the tapered thin-walled tube part with a smaller diameter. The end of the tapered thin-walled tube part with a larger diameter is called the big head end, and the end with a smaller diameter is called the small head end. S1: clamp the outer circle of the big head end, push the inner hole of the small head end, and clamp after aligning the margins at all places to be uniform; S2: turn the outer circle of the small head end, the diameter is greater than φ220, the length is about 50, which is enough to install the center frame; S3: install the center frame, withdraw the center, calibrate, and ensure that the tightness is appropriate; S4: flatten the end face of the small head end, taking into account The subsequent margins on the back of the step and the end face of the large head are uniform and sufficient; S5: Turn the tapered hole of the small head end; S6: Turn the center hole of the small head end and loosen the center frame; S7: Turn the outer circle, groove and The back of the step is rounded; S8: turn the head, clamp the outer circle of the small head end, flatten the end face, and install the center frame; S9: flatten the end face of the large head end; S10: turn the tapered hole to connect with the front tool; S11: turn the outer circle of the large head end.

6. The method for using the special tooling for tapered thin-walled tube parts according to claim 5, characterized in that: The finishing process comprises the following steps: S1: Clamp the outer circle of the small head end, use a liner, clamp the inner hole of the large head end with appropriate clamping force, prevent deformation and pay attention to cooling, push the inner hole of the large head end, align the allowances at all places and clamp it; S2: Polish the outer circle of the small head end near the groove, the diameter is greater than φ216, the length is about 50, which is enough to install the center frame, Ra6.3; S3: Install the center frame, withdraw the center, calibrate, and ensure the tightness is appropriate; S4: Flatten the end face of the large head end, taking into account the allowances at both ends, Ra6.3; S5: Programming and turning 1 / 4 elliptical holes and inner holes, turning through, ensuring the illustrated size and position requirements, Ra1.6; S6: Polish the elliptical hole, Ra1.6; S7: Install the tooling mandrel into the taper hole of the machine tool spindle, and fix the mandrel securely with the first nut; S8: Polish the cone of the tooling mandrel to ensure that the runout is less than 0.005, Ra1.6; S9: Load the tapered thin-walled tube parts into the mandrel and fix them with the pressure plate and the second nut; S10: Flatten the end face of the small head to ensure the total length Ra6.3; S11: Program the car shape to ensure the size and position requirements shown in the figure, pay attention to cooling, Ra6.3; S12: Use the first nut to push the part out of the core rod.

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