CN112475203A - Process for forging and forming welding neck flange for pipeline connection - Google Patents
Process for forging and forming welding neck flange for pipeline connection Download PDFInfo
- Publication number
- CN112475203A CN112475203A CN202011153246.4A CN202011153246A CN112475203A CN 112475203 A CN112475203 A CN 112475203A CN 202011153246 A CN202011153246 A CN 202011153246A CN 112475203 A CN112475203 A CN 112475203A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/32—Making machine elements wheels; discs discs, e.g. disc wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/04—Shaping in the rough solely by forging or pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/022—Open die forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention belongs to the technical field of flange forging, and particularly relates to a forging and forming process of a high-neck flange for pipeline connection. The process comprises the following steps: comprises blanking, heating, preforming, forming and punching; heating the blank by adopting an intermediate frequency furnace, performing and upsetting the blank into a cake shape after heating, and then placing the upset blank in a forming die for closed forming; in the preforming process, a 1000T electric screw press is adopted for preforming to upset the cylindrical blank; and then, a 2500T electric screw press forming die is adopted to fully cover the neck by a punch, and 315T closed single-point punching is carried out to cut off the connected skin and blanking. The invention has the advantages that the finished product is accurately blanked after adding allowance, and the size of the forged product is uniform and controllable; stable batch production is realized, and the production efficiency is improved. In addition, the effects of saving cost and reducing time consumption are achieved, and the economic benefit is improved.
Description
Technical Field
The invention belongs to the technical field of flange forging, and particularly relates to a forging and forming process of a high-neck flange for pipeline connection.
Background
At present, a pipeline connecting high-neck flange is formed mostly in a pre-forging, cogging and chambering mode, the blank allowance is large after final forging, the consistency is poor, the efficiency is low, the purpose of saving forging materials cannot be achieved, time and cutter consumption are increased in subsequent machining, the production cost is high, the efficiency is low, time is consumed, the material consumption is large, the production cost is increased, and the subsequent machining time is prolonged.
Regarding the flange forging method, the following patent documents are disclosed:
CN110814264A discloses a flange forging technology, its characterized in that: the method comprises the following steps: step S1: cutting, namely cutting the strip-shaped blank with the square cross section into a plurality of square blanks; step S2: heating, namely placing the square billet in a heating furnace for heating, so that the temperature of the square billet is higher than the recrystallization temperature and lower than the temperature of a solidus line; step S3: rounding, namely placing a square billet in a rounding die (100), and forging the square billet into a cylindrical billet; step S4: at the free end, upsetting the heated blank by using a press machine, and then punching the blank by using a punch; s5: ring rolling, namely mounting the blank on a ring rolling machine for ring rolling, and enlarging the central hole of the blank; step S6: annealing, namely placing the blank in a resistance furnace for annealing; and step S7, turning, namely turning the flange by using a lathe.
CN104439030A discloses a forging method of a large-diameter neck flange, which is characterized in that: the method comprises the following steps: heating the blank to a deformation temperature, and performing blank making and preforming; and then, conveying the prepared blank preformed piece to a workbench of a neck axial numerical control ring rolling machine, continuously biting the blank preformed piece into a closed hole formed by a die sleeved on a driving roller and the core roller under the action of the rotation motion of the driving roller and the feeding motion of the core roller to generate continuous local plastic deformation, wherein the radial wall thickness of the ring piece is reduced, the axial height is reduced, the inner diameter and the outer diameter are enlarged, the section is subjected to continuous local plastic deformation when the end surface roller performs the rotation end surface rolling motion and the axial feeding motion in the radial-axial motion, the feeding motion of the core roller and the end surface roller is stopped when the deformation size of a workpiece reaches a preset value, and the rolling of the high-neck flange blank is finished.
The two forging methods for the flange have the following defects: the allowance control is relatively extensive, and the forming die is not a completely closed die, so that the final blank has the phenomena of ellipse and uneven allowance, the consistency of the product cannot be ensured, the total consumed time is long, the automatic continuous production cannot be realized, and the problem of labor force cannot be solved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a process for forging and forming a high-neck flange for pipeline connection; the process of the invention can obviously save materials, and the formed blank has high consistency, low rejection rate and short production period, and greatly saves the time of mechanical processing.
Specifically, a blank is heated by an intermediate frequency furnace, the blank is firstly preformed by a 1000T electric screw press after being heated, a cylindrical blank is upset into a cake shape, and then the upset blank is placed in a forming die to be closed and formed;
and then, a 2500T electric screw press forming die is adopted to fully cover the neck by a punch, and a 315T closed single-point punch is adopted to punch the connected skin and cut off and blanking.
Heating the blank to 1200-1250 ℃ by adopting an intermediate frequency heating furnace, preferably heating the blank to 1230 ℃ by adopting the intermediate frequency heating furnace;
the 1000T electric screw press and the 2500T electric screw press are provided with ejection and spray cooling and lubricating devices in a matching way, and the turning sequence of the blank among the four equipment rooms, namely the heating furnace, the 1000T electric screw press, the 2500T electric screw press and the 315T closed single-point punch press, is clamped and placed by two robots;
when blanking, the raw material is sawed by a circular saw;
in the invention, the sawing surface of the circular saw is high and smooth in smoothness, and the consistency of each block material is high, thereby ensuring the subsequent forming;
the medium frequency furnace is adopted for automatic feeding and discharging in the heating process, the heating rate is uniform, the temperature is uniform, continuous discharging is realized, and the consistent beats are ensured;
in the pre-forming process, only upsetting is needed, forming is simple, and positioning is hardly needed;
the forming is positioned by the excircle, the positioning is simple, the neck is formed by the material carried by the punch, and the problems of positioning and forming in the past are solved.
The punching blanking speed is high, and the blank cannot deform, so that the blanking time is 1-3s during punching; preferably 2 s.
The invention has the beneficial effects that:
the flange mold is forged and formed by the method, and the beneficial effects are as follows:
(1) the finished product is accurately blanked after allowance is added, and the size of the forged product is uniform and controllable;
(2) the mould control is adopted, so that the stable batch production efficiency of the product is high;
(3) the obtained product blank is closer to a finished product in appearance or allowance, so that the material is saved and the cost is reduced;
(4) the time consumption of machining is greatly reduced, the consumption of cutters is low, and the cost is further saved. The 3 minutes is needed for forging and producing a product with the same specification at the fastest speed, the 38 seconds is needed for producing a product at present, the forging efficiency is improved by 78.9 percent, similarly, 80 products are produced by one device in one day by machining and processing a product, the production efficiency is improved to 120 pieces, the processing efficiency is improved by 50 percent, the total production efficiency can be improved by 64.45 percent, the manufacturing period is greatly reduced, and the economic benefit is very considerable; and the obtained forging stock has the advantages of high quality, good stability and low cost.
Drawings
FIG. 1 is a schematic illustration of a pre-upsetting process of the present invention;
FIG. 2 is a schematic view of the forming process of the present invention;
FIG. 3 is a schematic view of punching and blanking;
FIG. 4 is a schematic view of a forged finished blank;
1-1000T upper die, 2-1000T blank, 3-1000T lower die, 4-2500T upper die, 5-2500T blank, 6-2500T lower die, 7-315T stripper, 8-315T punch, 9-315T lower die and 10-315T blank.
Detailed Description
The present invention will now be further described with reference to specific embodiments in order to enable those skilled in the art to better understand the present invention.
Example 1
A process for forging and forming a hubbed flange for pipeline connection comprises the following steps: comprises blanking, heating, preforming, forming and punching;
wherein, when blanking, the raw material is sawed by a circular saw; the method has the advantages that the sawing surface of the circular saw is high in smoothness and smooth, the consistency of each block material is high, and subsequent forming is guaranteed;
then heating the blank by using an intermediate frequency furnace, heating the blank to 1230 ℃, then performing the blank by using a 1000T electric screw press, upsetting the cylindrical blank into a cake shape, and then inversely placing the upset blank into a forming die for closed forming;
and then, a 2500T electric screw press forming die is adopted to fully cover the neck by a punch, and a 315T closed single-point punch is adopted to punch the connected skin and cut off and blanking.
The 1000T electric screw press and the 2500T electric screw press are provided with ejection and spray cooling and lubricating devices in a matching way, and the blanks among the four equipment rooms, namely the heating furnace, the 1000T electric screw press, the 2500T electric screw press and the 315T closed single-point punch press, are clamped and placed by two robots in a rotating sequence.
The forging of the blank is completed, the clamping, the transferring and the positioning of the manipulator are facilitated, the whole production process only needs 38s, the efficiency is directly improved by about 2.3 times by 90s from the original production, and the forging efficiency is improved by 78.9%. Similarly, the number of machined products is increased from 80 to 120 when one piece of original equipment works one day, the machining efficiency is increased by 50%, the total production efficiency can be increased by 64.45%, the manufacturing period is greatly reduced, and considerable economic benefits are achieved; and the obtained forging stock has the advantages of high quality, good stability and low cost.
The working principle of the forging and forming process of the high-neck flange for pipeline connection provided by the invention is as follows: the blank is heated and then is preformed and upset into a cake shape by a 1000T press, then the upper surface and the lower surface of the upset blank are overturned by a mechanical arm and are placed into a forming die of a 2500T press, an upper die falls along with a sliding block and enters a lower die to be closed, the upset blank is further deformed to fill the whole die cavity for forming, the die is opened, a lower ejector rod ejects the blank, the mechanical arm clamps the blank to rotate to the lower die of the 315T press, finally, a punch falls, punching and blanking are carried out, the blanking time is 2s during punching, the punching and blanking speed is high, and the blank cannot be deformed.
According to the steps, the automatic feeding and discharging of the intermediate frequency furnace are adopted, the heating rate is uniform, the temperature is uniform, the continuous discharging is realized, and the consistent beats are ensured; in the pre-forming process, only upsetting is needed, forming is simple, and positioning is hardly needed; the forming is positioned by the excircle, the positioning is simple, the neck is formed by the material carried by the punch, and the problems of positioning and forming in the past are solved.
Claims (7)
1. A process for forging and forming a hubbed flange for pipeline connection comprises the following steps: comprises blanking, heating, preforming, forming and punching;
heating a blank by using an intermediate frequency furnace, heating the blank, performing the blank by using a 1000T electric screw press, upsetting the cylindrical blank into a cake shape, and then inversely placing the upset blank into a forming die for closed forming;
and then, a 2500T electric screw press forming die is adopted to fully cover the neck by a punch, and a 315T closed single-point punch is adopted to punch the connected skin and cut off and blanking.
2. The process for forging and forming a hubbed flange for pipe connection as claimed in claim 1, wherein the blank is heated to 1200-1250 ℃ by a medium frequency heating furnace.
3. A process of forging a hubbed flange for pipe connections as claimed in claim 1 wherein the billet is heated to 1230 ℃ using a medium frequency furnace.
4. The process for forging and forming a hubbed flange for pipe connection according to claim 1, wherein the 1000T electric screw press and the 2500T electric screw press are provided with an ejection and spray cooling and lubricating device in a matching manner, and the blank of the four equipment rooms of the heating furnace, the 1000T electric screw press, the 2500T electric screw press and the 315T closed single-point press is placed in a rotating manner by being held by two robots.
5. A process of forging a hubbed flange for pipe coupling as claimed in claim 1 wherein the stock is cut by a circular saw during blanking.
6. The process of forging a hubbed flange for pipe joining of claim 1 wherein the punching step takes 1 to 3 seconds of blanking time.
7. The process of forging a hubbed flange for pipe joining of claim 1 wherein the punching step takes 2 seconds to punch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011153246.4A CN112475203A (en) | 2020-10-26 | 2020-10-26 | Process for forging and forming welding neck flange for pipeline connection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011153246.4A CN112475203A (en) | 2020-10-26 | 2020-10-26 | Process for forging and forming welding neck flange for pipeline connection |
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| Publication Number | Publication Date |
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| CN112475203A true CN112475203A (en) | 2021-03-12 |
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| CN202011153246.4A Pending CN112475203A (en) | 2020-10-26 | 2020-10-26 | Process for forging and forming welding neck flange for pipeline connection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113172392A (en) * | 2021-03-19 | 2021-07-27 | 中国船舶重工集团公司第七二五研究所 | Open type processing method of DN 20-DN 125 copper-nickel alloy BFe30-1-1 flange |
| CN113843392A (en) * | 2021-09-14 | 2021-12-28 | 重庆青竹机械制造有限公司 | High-efficiency synchronizer gear sleeve blank machining process |
| CN114574749A (en) * | 2022-03-11 | 2022-06-03 | 无锡市正隆祥机械制造有限公司 | Base machining process capable of improving production efficiency |
| CN116900219A (en) * | 2023-07-17 | 2023-10-20 | 黄山鑫联精工机械有限公司 | Automatic forging production line for three-station flange products |
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| CN208758553U (en) * | 2018-08-28 | 2019-04-19 | 泰安隆泰金属制品有限公司 | A kind of multipurpose sliding flange open type blocker |
| CN109648029A (en) * | 2019-01-25 | 2019-04-19 | 重庆长征重工有限责任公司 | The forging die set and its forging method of large thin-wall cylinder class ring flange |
| CN110216232A (en) * | 2018-03-01 | 2019-09-10 | 上海汽车变速器有限公司 | The monoblock type conjunction gear gear forging technique of conjunction gear is shaped after first punching |
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2020
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Patent Citations (7)
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| WO2016037757A1 (en) * | 2014-09-11 | 2016-03-17 | Volkswagen Aktiengesellschaft | Method for producing a massive metal composite component, and massive metal composite component produced using said method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113172392A (en) * | 2021-03-19 | 2021-07-27 | 中国船舶重工集团公司第七二五研究所 | Open type processing method of DN 20-DN 125 copper-nickel alloy BFe30-1-1 flange |
| CN113843392A (en) * | 2021-09-14 | 2021-12-28 | 重庆青竹机械制造有限公司 | High-efficiency synchronizer gear sleeve blank machining process |
| CN114574749A (en) * | 2022-03-11 | 2022-06-03 | 无锡市正隆祥机械制造有限公司 | Base machining process capable of improving production efficiency |
| CN114574749B (en) * | 2022-03-11 | 2023-02-10 | 无锡市正隆祥机械制造有限公司 | Base machining process capable of improving production efficiency |
| CN116900219A (en) * | 2023-07-17 | 2023-10-20 | 黄山鑫联精工机械有限公司 | Automatic forging production line for three-station flange products |
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Application publication date: 20210312 |