A special tool for conical thin-walled pipe parts and a use method thereof

Abstract

The scheme discloses a special tool for a conical thin-wall pipe part in the technical field of tooling, 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 conus is arranged between the first threaded section and the second threaded section, a first nut is arranged on the first threaded section, and a second nut is arranged on the second threaded section. The scheme is convenient for clamping the conical thin-wall pipe part and convenient for processing the conical thin-wall pipe part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tooling, in particular to a special tool for a conical thin-walled pipe part and a use method thereof. BACKGROUND

[0002] A steam generator, also known as a steam heat source machine (commonly known as a boiler), is a mechanical device that uses the heat energy of fuel or other energy to heat water into hot water or steam. The steam generator is one of the core devices of a nuclear power plant. The conical thin-walled pipe part is an important component of the steam generator, and the inner cavity thereof is a "conical surface + elliptical surface", which is not easy to clamp. The outer diameter has a local groove, and the local wall is thin and prone to deformation during machining. The above factors all cause certain difficulties in machining. If the machining scheme is not appropriate, the performance of the part will not meet the requirements, and safety hazards will be caused. In summary, the cold machining of the conical thin-walled pipe part is also an important link to ensure the safety of the nuclear power plant, and must be given sufficient attention, otherwise nuclear safety hazards will be caused, which will pose a major threat to people's life and property safety. SUMMARY

[0003] The present application aims to provide a special tool for a conical thin-walled pipe part and a use method thereof, so as to solve the problems that the existing conical thin-walled pipe part is not easy to clamp and is difficult to machine.

[0004] The special tool for a conical thin-walled pipe part in the present application 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 conical body is arranged between the first threaded section and the second threaded section, a first nut is arranged on the first threaded section, and a second nut is arranged on the second threaded section.

[0005] The working principle and beneficial effects of the present application are as follows: when in use, the conical thin-walled pipe part is sleeved and attached to the conical body of the tool core rod, the first nut and the second nut are used to clamp the conical thin-walled pipe part, the tool core rod is installed on a machine tool before the conical thin-walled pipe part is installed on the tool core rod, the conical body on the tool core rod is machined to reduce the error caused by the tool core rod, the conical thin-walled pipe part is installed in the tool core rod and fixed firmly, and then the end face and the shape are machined.

[0006] Further, the second threaded section is further provided with a pressing plate, and the pressing plate is located between the first nut and the second nut. The pressing plate is arranged to make the clamping more stable.

[0007] Further, the diameter of the first threaded section is greater than that of the second threaded section, and the first threaded section is connected with a cylinder.

[0008] The use method of the special tool for a conical thin-walled pipe part comprises semi-finishing and finishing.

[0009] Furthermore, the semi-precision turning includes the following steps: The inner hole of the tapered thin-walled tubular part is a tapered hole and an elliptical hole. The elliptical hole is near the end with a larger diameter of the tapered thin-walled tubular part, and the tapered hole is near the end with a smaller diameter of the tapered thin-walled tubular part. The end with a larger diameter of the tapered thin-walled tubular part is called the large end, and the end with a smaller diameter is called the small end. S1: Clamp the outer circle of the large end, push the inner hole of the small end, and after aligning all the allowances evenly, clamp it tightly; S2: Turn the outer circle of the small end, with a diameter greater than φ220 and a length of about 50, which is sufficient to install the center frame; S3: Install the center frame, retract the center, and adjust to ensure proper tightness; S4: Flatten the end face of the small end, taking into account... The allowance on the back of the step and the end face of the large end is uniform and sufficient; S5: Machin the tapered hole at the small end; S6: Top the center hole at the small end, loosen the center support; S7: Machin the outer circle and groove of the small end. Step back, rounded corners; S8: Turn around, clamp the small end outer circle, close to the flat end face, install the center frame; S9: Flatten the large end end face; S10: Turn the tapered hole to connect with the front tool; S11: Turn the large end outer circle.

[0010] Furthermore, the precision machining includes the following steps: S1: Clamp the outer circle of the small end with a liner, apply appropriate clamping force to prevent deformation and ensure cooling, align the inner hole of the large end, and clamp after ensuring uniform allowance at all points; S2: Perform a finishing cut on the outer circle of the small end near the groove, with a diameter greater than φ216 and a length of approximately 50 mm, sufficient for installing the center support, Ra 6.3; S3: Install the center support, retract the center, and calibrate to ensure proper tightness; S4: Flatten the end face of the large end, ensuring uniform allowance at both ends, Ra 6.3; S5: Program the 1 / 4 elliptical hole and inner hole, ensuring a through pass and meeting the dimensional and positional accuracy requirements shown in the drawing, Ra 1.6; S6: Polish the elliptical hole, Ra 1.6; S7: Insert the tooling mandrel into the machine tool spindle taper hole and secure it firmly with the first nut; S8: Finish the conical shape of the tooling mandrel with one pass, ensuring runout is less than 0.005, Ra 1.6; S9: Insert the tapered thin-walled tubular part into the mandrel and secure it with the pressure plate and the second nut; S10: Flatten the small end face to ensure the overall length... Ra6.3; S11: Program the shape of the car body, ensuring the dimensions and positional accuracy requirements shown in the diagram. Pay attention to cooling. Ra6.3; S12: Use the first nut to push the part out of the mandrel. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the conical thin-walled tube-like part in this invention;

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

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

[0014] The application will be described in further detail below by way of specific embodiments:

[0015] The reference signs in the attached drawings of the specification include: a conical thin-walled tubular part 1, a cylinder 2, a first nut 3, a pressing plate 4, a second nut 5, a second threaded section 6, a center hole 7, a first threaded section 8, a cone 9.

[0016] The embodiment is basically as shown in the attached drawings: a special tool for a conical thin-walled tubular part, comprising a tool mandrel, one end of the tool mandrel being provided with a center hole 7, the tool mandrel comprising a first threaded section 8 and a second threaded section 6, a cone 9 being arranged between the first threaded section 8 and the second threaded section 6, the first threaded section 8 being provided with a first nut 3, the second threaded section 6 being provided with a second nut 5, the second threaded section 6 further being provided with a pressing plate 4, the pressing plate 4 being arranged between the first nut 3 and the second nut 5, the first threaded section 8 having a larger diameter than the second threaded section 6, the first threaded section 8 being fixedly connected with the cylinder 2. Figures 1-3 A method for using a special tool for a conical thin-walled tubular part, comprising a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, the method comprising: a, checking the starting file; b, inspecting the raw materials; c, forging; d, rough machining; e, ultrasonic testing; f, performance heat treatment; g, scribing and sampling; h, physical and chemical testing; i, semi-finishing; j, ultrasonic testing; k, finishing; l, marking; m, visual inspection; n, size inspection; o, liquid penetrant testing; p, cleaning, packaging; q, checking the completion report.

[0017] According to the above process flow, the tool of the application mainly involves the cold machining process "k finishing", which includes two processes of semi-finishing and finishing:

[0018] ①For semi-finishing, it can be performed on a CY-K660 type numerical control lathe, and the process is as follows:

[0019] The inner hole of the conical thin-walled tubular part 1 is a conical hole and an elliptical hole, the elliptical hole being close to the larger diameter end of the conical thin-walled tubular part 1, and the conical hole being close to the smaller diameter end of the conical thin-walled tubular part 1, the larger diameter end of the conical thin-walled tubular part 1 being referred to as a large end, and the smaller diameter end being referred to as a small end;

[0020] Semi-finishing includes the following steps: the inner hole of the conical thin-walled tubular part 1 is a conical hole and an elliptical hole, the elliptical hole being close to the larger diameter end of the conical thin-walled tubular part 1, and the conical hole being close to the smaller diameter end of the conical thin-walled tubular part 1, the larger diameter end of the conical thin-walled tubular part 1 being referred to as a large end also being the right end in

[0021] Figure 1 the smaller diameter end being referred to as a small end also being the left end in Figure 1 ​S1: clamp the big head end outer circle, top the small head end inner hole, find the uniformity of the remaining amount, and then clamp; S2: turn the small head end outer circle, the diameter is greater than φ220, the length is about 50, which is enough to install the center frame; S3: install the center frame, retract the center, correct, and ensure that the tightness is appropriate; S4: turn the small head end face, and consider the subsequent remaining amount of the φ step back and the big head end face; S5: turn the small head end tapered hole; S6: top the small head end center hole 7, loosen the center frame; S7: turn the small head end outer circle, groove and φ step back, and round the corner; S8: adjust the head, clamp the small head end outer circle, rely on the flat end face, and install the center frame; S9: turn the big head end face; S10: turn the tapered hole and the front tool; S11: turn the big head end outer circle;

[0022] ②For finish turning, the CY-K660 type numerical control lathe can be used, and the process is as follows:

[0023] The finish turning includes the following steps: S1: clamp the small head end outer circle, which needs to use a pad, the clamping force is appropriate, deformation is prevented, and cooling is paid attention to, top the big head end inner hole, find the uniformity of the remaining amount, and then clamp; S2: turn the small head end outer circle near the groove, the diameter is greater than φ216, the length is about 50, which is enough to install the center frame; S3: install the center frame, retract the center, correct, and ensure that the tightness is appropriate; S4: turn the big head end face, and consider the uniformity of the remaining amount of both ends; S5: program to turn 1 / 4 oval hole and inner hole, turn through, ensure the illustrated size and position degree requirements, and Ra1.6; S6: polish the oval hole, Ra1.6; S7: install the tooling core rod into the machine tool spindle taper hole, and fix the core rod firmly with the first nut 3; S8: turn the tooling core rod cone 9 with one knife, ensure that the runout is less than 0.005, and Ra1.6; S9: install the tapered thin-walled pipe part 1 into the core rod, and fix it with the pressing plate 4 and the second nut 5; S10: turn the small head end face, ensure the total length, and Ra6.3; S11: program to turn the shape, ensure the illustrated size and position degree requirements, pay attention to cooling, and Ra6.3; S12: push the part out of the core rod with the first nut 3.

[0024] It is proved by practice that the tooling is reasonable and feasible, high in efficiency, and the tapered thin-walled pipe part 1 produced by using the tooling can meet the requirements.

[0025] The above-described is only an embodiment of the present application, and the well-known specific structure and characteristics in the scheme are not described too much. It should be pointed out that, for those skilled in the art, without departing from the structure of the present application, a number of deformations and improvements can be made, which should be regarded as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of the claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A method for using a special tooling for tapered thin-walled tubular parts, characterized in that: The tooling includes a tooling mandrel with a central hole at one end. The tooling mandrel includes a first threaded section and a second threaded section. A cone is provided between the first threaded section and the second threaded section. A first nut is provided on the first threaded section and a second nut is provided on the second threaded section. A pressure plate is also provided on the second threaded section, located between the first nut and the second nut. The diameter of the first threaded section is larger than that of the second threaded section, and a cylinder is connected to the first threaded section. Including semi-finished and finished machining; The semi-precision turning includes the following steps: The inner hole of the tapered thin-walled tubular part is a tapered hole and an elliptical hole. The elliptical hole is near the end with the larger diameter of the tapered thin-walled tubular part, and the tapered hole is near the end with the smaller diameter of the tapered thin-walled tubular part. The end with the larger diameter of the tapered thin-walled tubular part is called the large end, and the end with the smaller diameter is called the small end. S1: Clamp the outer circle of the large end, push the inner hole of the small end, and after aligning all the allowances evenly, clamp it tightly; S2: Turn the outer circle of the small end, the diameter is greater than φ220, enough to install the center frame; S3: Install the center frame, retract the center, and adjust to ensure proper tightness; S4: Flatten the end face of the small end, taking into account φ The allowance on the back of the step and the end face of the large end is uniform and sufficient; S5: Machin the tapered hole at the small end; S6: Top the center hole at the small end, loosen the center support; S7: Machin the outer circle, groove and φ of the small end. Step back, rounded corners; S8: Turn around, clamp the small end outer circle, close to the flat end face, install the center frame; S9: Flatten the large end end face; S10: Turn the tapered hole to connect with the front tool; S11: Turn the large end outer circle; The precision machining includes the following steps: A1: Clamp the outer diameter of the small end with a liner, apply appropriate clamping force to prevent deformation and ensure cooling, align the inner hole of the large end, and clamp after ensuring uniform allowance at all points; A2: Perform a finishing cut on the outer diameter of the small end near the groove, with a diameter greater than φ216 and a length sufficient for installing a center rest, Ra 6.3; A3: Install the center rest, retract the center, and calibrate to ensure proper tightness; A4: Flatten the end face of the large end, ensuring uniform allowance at both ends, Ra 6.3; A5: Program the machining process. A6: Polish the elliptical hole to Ra 1.6; A7: Insert the tooling mandrel into the machine tool spindle tapered hole and secure it firmly with the first nut; A8: Finish the conical shape of the tooling mandrel with one pass, ensuring runout is less than 0.005, Ra 1.6; A9: Insert the tapered thin-walled tubular part into the mandrel and secure it with the pressure plate and the second nut; A10: Flatten the small end face to ensure the overall length... Ra6.3; A11: Program the shape of the car body, ensuring the dimensions and positional accuracy requirements shown in the drawing, and pay attention to cooling. Ra6.3; A12: Use the first nut to push the part out of the mandrel.

Images