阅读说明：本技术 一种核电主泵泵壳锻件近净成型模具及成型方法 (Near-net forming die and forming method for pump shell forging of nuclear power main pump ) 是由 白润达 于 2021-02-26 设计创作，主要内容包括：一种核电主泵泵壳锻件近净成型模具及成型方法属于金属锻造加工技术领域,具体涉及一种核电主泵泵壳锻件近净成型模具及成型方法。本发明提供一种核电主泵泵壳锻件近净成型模具及成型方法。本发明的核电主泵泵壳锻件近净成型模具,包括上模、下模、水平左模和水平右模,其特征在于：所述上模中心设置有管嘴芯模,管嘴芯模和上模具之间设置有管嘴成型间隙；所述下模为一与工件下部仿型的槽形体；所述水平右模包括工件右端面成型体,工件右端面成型体上设置有中心杆,中心杆端部设置有锥形的收口成型头,收口成型头端部为导向杆。(A near-net forming die and a near-net forming method for a nuclear power main pump shell forging belong to the technical field of metal forging processing, and particularly relate to a near-net forming die and a near-net forming method for a nuclear power main pump shell forging. The invention provides a near-net forming die and a near-net forming method for a pump shell forging of a nuclear power main pump. The invention discloses a near-net forming die for a pump shell forging of a nuclear power main pump, which comprises an upper die, a lower die, a horizontal left die and a horizontal right die, and is characterized in that: a nozzle core mould is arranged in the center of the upper mould, and a nozzle forming gap is arranged between the nozzle core mould and the upper mould; the lower die is a groove-shaped body which is modeled with the lower part of the workpiece; the horizontal right die comprises a workpiece right end face forming body, a central rod is arranged on the workpiece right end face forming body, a conical closing-up forming head is arranged at the end part of the central rod, and a guide rod is arranged at the end part of the closing-up forming head.)

1. The utility model provides a nearly net forming die of nuclear power main pump case forging, includes mould (9), lower mould (13), horizontal left side mould (1) and horizontal right side mould (11), its characterized in that: a nozzle core mould (6) is arranged at the center of the upper mould (9), and a nozzle forming gap (8) is arranged between the nozzle core mould (6) and the upper mould (9); the lower die (13) is a groove-shaped body which is modeled with the lower part of the workpiece; the horizontal right die (11) comprises a workpiece right end face forming body (10), a central rod (14) is arranged on the workpiece right end face forming body (10), a conical closing-up forming head (15) is arranged at the end part of the central rod (14), and a guide rod (16) is arranged at the end part of the closing-up forming head (15); the horizontal left die (1) comprises a workpiece left end face forming body (4), a closing-up sleeve (3) corresponding to the closing-up forming head (15) is arranged in the workpiece left end face forming body (4), and a guide groove (2) matched with the guide rod (16) is further arranged in the horizontal left die (1).

2. The near-net-shape forming die for the pump shell forging of the nuclear power main pump according to claim 1, wherein the near-net-shape forming die comprises: and reinforcing rib forming grooves (12) are formed in the inner surfaces of the upper die (9) and the lower die (13).

3. The near-net-shape forming die for the pump shell forging of the nuclear power main pump according to claim 1, wherein the near-net-shape forming die comprises: and a mold locking mechanism (18) is arranged between the upper mold (9) and the lower mold (13).

4. The near-net-shape forming die for the pump shell forging of the nuclear power main pump according to claim 1, wherein the near-net-shape forming die comprises: the nozzle core mould (6) is fixed on an upper mould (9) through a core mould flange (7).

5. The near-net forming method of the nuclear power main pump shell forging is characterized by comprising the following steps of:

1) forging a barrel blank (5) into a barrel shape, and processing a hole corresponding to a nozzle core mold (6) at a nozzle part;

2) heating the cylindrical blank (5);

3) placing the blank (5) into a lower die (13);

4) covering the upper die (9) and locking the upper die and the lower die (13); the nozzle core mould (6) extends into a hole on the side surface of the cylindrical blank (5);

5) the horizontal left die and the horizontal right die act to apply horizontal force to the blank for forming; after the horizontal left die and the horizontal right die extrude the blank, the blank metal flows towards the forming gap of the pipe nozzle, and the pipe nozzle of the workpiece is formed under the combined action of the upper die and the pipe nozzle core die; the blank metal flows towards the direction of the closing-in sleeve, and the closing-in of the workpiece is formed under the combined action of the closing-in forming head and the closing-in sleeve; meanwhile, the blank is extruded by the workpiece left end face forming body and the workpiece right end face forming body to form two end faces of the workpiece; the blank metal flows towards the reinforcing rib forming groove to form the reinforcing rib of the workpiece;

6) unlocking the mold locking mechanism;

7) unloading the core mould flange (7);

8) and opening the upper die (9) and taking out the workpiece.

Technical Field

The invention belongs to the technical field of metal forging and processing, and particularly relates to a near-net forming die and a near-net forming method for a pump shell forging of a nuclear power main pump.

Background

With the increasing emphasis on nuclear power safety, the safety requirements of nuclear power equipment are gradually improved, and many nuclear primary parts are changed into forgings from castings. The pump casing of the main pump of the nuclear primary equipment is changed into a forged piece from an original casting, and the pump casing is researched and developed in a large-scale heavy machinery factory in China at present.

The pump shell has a complex shape and a large size and weight, so that only one cylinder can be forged in forging and then cut, the good outer layer tissue is cut off, the fiber tissue is damaged, and in addition, the cutting allowance is large in production and manufacturing, the production efficiency is extremely low, and the material utilization rate is extremely low.

Disclosure of Invention

The invention aims at the problems and provides a near-net forming die and a near-net forming method for a pump shell forging of a nuclear power main pump.

In order to achieve the purpose, the invention adopts the following technical scheme that the near-net forming die for the pump shell forging of the nuclear power main pump comprises an upper die, a lower die, a horizontal left die and a horizontal right die, and is characterized in that: a nozzle core mould is arranged in the center of the upper mould, and a nozzle forming gap is arranged between the nozzle core mould and the upper mould; the lower die is a groove-shaped body which is modeled with the lower part of the workpiece; the horizontal right die comprises a workpiece right end face forming body, a central rod is arranged on the workpiece right end face forming body, a conical closing-up forming head is arranged at the end part of the central rod, and a guide rod is arranged at the end part of the closing-up forming head; the horizontal left die comprises a workpiece left end face forming body, a closing-up sleeve corresponding to the closing-up forming head is arranged in the workpiece left end face forming body, and a guide groove matched with the guide rod is further arranged in the horizontal left die.

In a preferred embodiment of the present invention, the inner surfaces of the upper die and the lower die are provided with rib forming grooves.

As a second preferred aspect of the present invention, a mold clamping mechanism is provided between the upper mold and the lower mold.

As a third preferred mode of the present invention, the nozzle core mold is fixed to the upper mold by a core mold flange.

The near-net forming method of the nuclear power main pump shell forging is characterized by comprising the following steps of.

1) Forging the blank of the cylinder body, processing the blank into a cylinder shape, and processing a hole corresponding to the pipe nozzle core mold at the pipe nozzle part.

2) The cylindrical billet is heated.

3) And putting the blank into a lower die.

4) Covering the upper die and locking the upper die with the lower die; the nozzle core mold extends into the hole in the side surface of the cylindrical blank.

5) The horizontal left die and the horizontal right die act to apply horizontal force to the blank for forming; after the horizontal left die and the horizontal right die extrude the blank, the blank metal flows towards the forming gap of the pipe nozzle, and the pipe nozzle of the workpiece is formed under the combined action of the upper die and the pipe nozzle core die; the blank metal flows towards the direction of the closing-in sleeve, and the closing-in of the workpiece is formed under the combined action of the closing-in forming head and the closing-in sleeve; meanwhile, the blank is extruded by the workpiece left end face forming body and the workpiece right end face forming body to form two end faces of the workpiece; the metal stock flows toward the rib forming grooves to form the ribs of the workpiece.

6) And unlocking the mold locking mechanism.

7) And (4) unloading the nozzle core mold flange.

8) And opening the upper die and taking out the workpiece.

The invention has the advantages that the tubular blank can be formed in a die once after being forged, the allowance is controllable, the two nozzles are reasonably formed, and the fiber state can be distributed along the shape of the nozzles.

Meanwhile, the tube seat part forms a complete tissue fiber state, so that the product performance can be greatly improved, and the running safety of the nuclear primary main pump is ensured. In addition, the machining efficiency is greatly improved due to the reduction of the allowance.

Drawings

FIG. 1 is a schematic diagram of the present invention prior to stamping.

Fig. 2 is a side sectional view of fig. 1.

Fig. 3 is a schematic diagram of the stamped structure of the present invention.

Fig. 4 is a side sectional view of fig. 3.

FIG. 5 is a schematic structural diagram of a pump casing of a nuclear power main pump.

Fig. 6 is a top view of fig. 5.

Fig. 7 is a left side view of fig. 5.

In the drawing, 1 is a horizontal left die, 2 is a guide groove, 3 is a closing sleeve, 4 is a workpiece left end face forming body, 5 is a blank, 6 is a nozzle core die, 7 is a core die flange, 8 is a nozzle forming gap, 9 is an upper die, 10 is a workpiece right end face forming body, 11 is a horizontal right die, 12 is a reinforcing rib forming groove, 13 is a lower die, 14 is a center rod, 15 is a closing forming head, 16 is a guide rod, 18 is a die locking mechanism, 19 is a closing part of a workpiece, 20 is a nozzle part of the workpiece, and 21 is a reinforcing rib part of the workpiece.

Detailed Description

The invention discloses a near-net forming die for a pump shell forging of a nuclear power main pump, which comprises an upper die 9, a lower die 13, a horizontal left die 1 and a horizontal right die 11, and is characterized in that: a nozzle core mould 6 is arranged at the center of the upper mould 9, and a nozzle forming gap 8 is arranged between the nozzle core mould 6 and the upper mould 9; the lower die 13 is a groove-shaped body which is modeled with the lower part of the workpiece; the horizontal right die 11 comprises a workpiece right end face forming body 10, a central rod 14 is arranged on the workpiece right end face forming body 10, a conical closing-up forming head 15 is arranged at the end of the central rod 14, and a guide rod 16 is arranged at the end of the closing-up forming head 15; the horizontal left die 1 comprises a workpiece left end face forming body 4, a closing-up sleeve 3 corresponding to a closing-up forming head 15 is arranged in the workpiece left end face forming body 4, and a guide groove 2 matched with a guide rod 16 is further arranged in the horizontal left die 1.

In a preferred embodiment of the present invention, the inner surfaces of the upper mold 9 and the lower mold 13 are provided with rib forming grooves 12.

As a second preferred embodiment of the present invention, a clamping mechanism 18 is provided between the upper mold 9 and the lower mold 13.

In a third preferred embodiment of the present invention, the nozzle core mold 6 is fixed to an upper mold 9 by a core mold flange 7.

The near-net forming method of the nuclear power main pump shell forging is characterized by comprising the following steps of.

1) The barrel blank 5 is forged and processed into a barrel shape, and a hole corresponding to the nozzle core mold 6 is processed at the nozzle part.

2) The cylindrical blank 5 is heated.

3) The blank 5 is placed in the lower die 13.

4) Covering the upper die 9 and locking the upper die with the lower die 13; the nozzle core 6 is inserted into a hole in the side surface of the cylindrical blank 5.

5) The horizontal left die and the horizontal right die act to apply horizontal force to the blank for forming; after the horizontal left die and the horizontal right die extrude the blank, the blank metal flows towards the forming gap of the pipe nozzle, and the pipe nozzle of the workpiece is formed under the combined action of the upper die and the pipe nozzle core die; the blank metal flows towards the direction of the closing-in sleeve, and the closing-in of the workpiece is formed under the combined action of the closing-in forming head and the closing-in sleeve; meanwhile, the blank is extruded by the workpiece left end face forming body and the workpiece right end face forming body to form two end faces of the workpiece; the metal stock flows toward the rib forming grooves to form the ribs of the workpiece.

6) And unlocking the mold locking mechanism.

7) The mandrel flange 7 is removed.

8) And opening the upper die 9 and taking out the workpiece.

It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.