CN110814144A - Composite forming method for thick helical blade - Google Patents
Composite forming method for thick helical blade Download PDFInfo
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- CN110814144A CN110814144A CN201911137825.7A CN201911137825A CN110814144A CN 110814144 A CN110814144 A CN 110814144A CN 201911137825 A CN201911137825 A CN 201911137825A CN 110814144 A CN110814144 A CN 110814144A
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- helical blade
- blank
- planar
- thick
- helical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Forging (AREA)
Abstract
The invention relates to the technical field of helical blade forming processing, in particular to a thick helical blade composite forming method, which comprises the following steps: a. blanking, namely calculating a blanking graph of a plane body helical blade blank according to a helical blade expansion calculation formula; b. heating the blank of the planar helical blade to convert crystals of the blank of the planar helical blade into austenite at high temperature; c. drawing a planar helical blade blank, fixing a first end of an inner hole notch edge of the high-temperature planar helical blade blank, drawing a second end of the inner hole notch edge by using hoisting equipment, extending an inner helical line of a helical blade to a required size, and primarily forming the planar helical blade blank into a helical blade; d. and placing the primary helical blade on a prefabricated helical die, and applying pressure to the prefabricated helical die by a press machine to press the primary helical blade into a standard thick helical blade. The method can ensure the inner diameter and the outer diameter of the formed helical blade, is suitable for mass production of thick helical blades, and has high efficiency and stable forming quality of the helical blade.
Description
Technical Field
The invention relates to the technical field of forming and processing of helical blades, in particular to a thick helical blade composite forming method applied to helical blades of a helical conveyor, a vertical shaft drilling machine and the like.
Background
At present, large thick helical blades are generally cast and formed, small thin helical blades are generally cold-pressed and formed, and the helical blades are in special space curved surface shapes, so that the casting and forming are difficult, the casting and forming cost is high, the flowing space of cast metal is narrow, and the material performance is poor due to poor fluidity of molten metal; the cold press molding is suitable for small helical blades or helical blades with small pressure, and the molding is easy to rebound and is irregular. The large thick helical blade is formed by cold drawing or direct hot pressing or cold pressing, the requirement of the cold drawing on the curved surface is not strict, and the inner diameter and the outer diameter of the direct pressing cannot be well controlled.
Disclosure of Invention
The invention aims to solve the problems and the defects, and provides a thick helical blade composite forming method which is suitable for a thick helical blade blank forming technology, wherein the helical blade is subjected to hot drawing and primary forming and then is subjected to hot pressing during forming, a hot-drawn workpiece is easy to deform, the inner diameter and the outer diameter of the formed helical blade can be ensured, a professional prefabricated helical die is additionally arranged, the thick helical blade composite forming method is suitable for mass production of the thick helical blade, the production efficiency is high, the pressing speed is high, the helical blade forming quality is stable, the pitch size error is small, and the curved surface forming is smooth.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a thick helical blade composite forming method comprises the following steps: a. blanking, namely calculating a blanking graph of a plane body helical blade blank according to a helical blade expansion calculation formula; b. heating the blank of the planar helical blade to convert crystals of the blank of the planar helical blade into austenite at high temperature; c. drawing a planar helical blade blank, fixing a first end of an inner hole notch edge of the high-temperature planar helical blade blank, drawing a second end of the inner hole notch edge by using hoisting equipment, extending an inner helical line of a helical blade to a required size, and primarily forming the planar helical blade blank into a helical blade; d. and placing the primary helical blade on a prefabricated helical die, and applying pressure to the prefabricated helical die by a press machine to press the primary helical blade into a standard thick helical blade.
According to the thick helical blade composite forming method, in the step b, a welding groove is formed on the planar helical blade blank before the planar helical blade blank is heated.
According to the thick helical blade composite forming method, the welding groove is arranged on the inner side of the plane body helical blade blank.
According to the thick helical blade composite forming method, the heating of the plane body helical blade blank in the step b is to place the plane body helical blade blank in a heating furnace to be heated to 727-900 ℃.
According to the thick helical blade composite forming method, the planar helical blade blanked in the step a is made of low-carbon alloy steel.
According to the thick helical blade composite forming method, the helical blade expansion calculation formula in the step a is a calculation formula of a triangular algorithm.
According to the thick helical blade composite forming method, in the step C, the first end of the inner hole notch edge of the planar helical blade blank is fixed on an earth anchor, and the hoisting equipment is connected with the inner hole notch edge of the planar helical blade blank through a C-shaped opening lifting hook.
According to the thick helical blade composite forming method, the opening of the C-shaped opening hook faces to the horizontal direction, and the opening of the C-shaped opening hook is matched with the thickness of the plane body helical blade blank.
According to the thick helical blade composite forming method, the prefabricated helical die comprises an upper die and a lower die, the lower end of the upper die and the upper end of the lower die are both provided with helical surfaces matched with standard thick helical blades, and the upper end of the upper die is provided with a press machine.
According to the thick helical blade composite forming method, the standard thick helical blade which is subjected to the compression forming in the step d is placed at room temperature and cooled to normal temperature.
The composite forming method of the thick helical blade has the beneficial effects that:
1. the thick helical blade composite forming method is suitable for thick helical blade blank forming technology, during forming, hot pressing is carried out after the helical blade is subjected to hot drawing and primary forming, a hot drawing workpiece is easy to deform and is not easy to have internal cracks, the pressure in the pressing process can be reduced through hot pressing, the inner diameter and the outer diameter of the formed helical blade can be ensured, in addition, a professional prefabricated helical die is arranged, the thick helical blade composite forming method is suitable for batch production of the thick helical blade, the production efficiency is high, the pressing speed is high, the helical blade forming quality is stable, the pitch size error is small, and the curved surface forming is smooth;
2. in the thick helical blade composite forming method, a welding groove is formed on the planar helical blade blank before the planar helical blade blank is heated in the step b, and the groove forming processing is convenient for the planar body;
3. in the thick helical blade composite forming method, the opening of the C-shaped opening lifting hook faces to the horizontal direction, so that the helical blade is conveniently and stably pulled and the forming of the helical blade is facilitated.
Drawings
FIG. 1 is a schematic top view of a planar body helical blade blank according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a C-shaped opening hook according to an embodiment of the invention.
Fig. 3 is a schematic view of the overall structure of a prefabricated screw mold according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a lower die of a prefabricated screw mold according to an embodiment of the present invention.
In the figure: 100 is a planar body helical blade blank, 200 is a C-shaped open hook, 300 is an upper die, 400 is a standard thick helical blade, and 500 is a lower die.
Detailed Description
The composite forming method for thick helical blades of the present invention is described in more detail by the specific embodiments with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 4, the embodiment discloses a thick helical blade composite molding method, which includes the following steps: a. numerical control blanking, namely calculating a steel plate blanking drawing of a plane body helical blade blank according to a helical blade expansion calculation formula, wherein the plane body helical blade is made of low-carbon alloy steel; b. heating the blank of the planar helical blade to convert the crystal of the blank of the planar helical blade into austenite at high temperature, wherein the stretching process of the helical blade is an internal helical stretching process, internal cracks are not easy to appear in the thermal stretching, and the pressure in the pressing process can be reduced; c. drawing a planar helical blade blank by utilizing the austenite elongation characteristic of a steel plate crystal, fixing a first end of an inner hole notch edge of the high-temperature planar helical blade blank, drawing a second end of the inner hole notch edge by using hoisting equipment to extend an inner helical line of a helical blade to a required size, and primarily forming the planar helical blade blank into a helical blade; d. and placing the primary helical blade on a prefabricated helical die, and applying pressure to the prefabricated helical die by a press machine to press the primary helical blade into a standard thick helical blade. The blade development drawing processing to spiral curved surface forming process is the process that interior spiral line is elongated and outer spiral line shaping, this thick helical blade composite forming method divides two-step shaping, first step hot drawing process and second step compression molding, first step hot drawing process in the first shaping blade exist irregularly, the error is big grade shortcoming, rethread second step standard die press forming, the hot pressing has advantages such as bounce-back deformation is little, can guarantee the inside and outside footpath after the helical blade shaping, professional prefabricated spiral mould has been set up in addition, be fit for batch production thick helical blade, high production efficiency, pressing speed is fast, helical blade shaping stable quality, pitch size error is little, the curved surface shaping is smooth.
In this embodiment, preferably, in the step b, a welding groove is formed on the planar helical blade blank before the planar helical blade blank is heated, the groove forming processing for the planar helical blade blank is convenient, and a semi-automatic flame cutting machine is adopted for the welding groove. Specifically, the welding groove is arranged on the inner side of the planar helical blade blank.
In this embodiment, preferably, the heating step b is to heat the planar helical blade blank to 727-900 ℃ in a heating furnace, and the blank is not easy to have internal cracks during hot drawing at the temperature, so that the pressure in the pressing process can be reduced.
In this embodiment, preferably, the calculation formula of the helical blade expansion in step a is a calculation formula of a triangular algorithm.
In this embodiment, preferably, in the step C, a first end of an inner hole notch edge of the planar helical blade blank is fixed on the ground anchor, and the hoisting device is connected with the inner hole notch edge of the planar helical blade blank through a C-shaped opening hook; the opening of C type opening lifting hook is towards the horizontal direction, and the opening of C type opening lifting hook and the thickness phase-match of plane body helical blade blank conveniently stably hold helical blade and do benefit to the helical blade shaping.
In this embodiment, specifically, prefabricated spiral mould includes mould and lower mould, and the lower extreme of going up the mould all sets up to the helicoid with the thick helical blade assorted of standard with the upper end of lower mould, and the mould helicoid is processed out through three-dimensional drawing programming, goes up the upper end of mould in addition and sets up the press.
In this embodiment, preferably, the standard thick helical blade after being press-formed in step d is cooled to normal temperature at room temperature, which is equivalent to normalizing the workpiece, and has no influence on the physical properties of the workpiece.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
Exemplary embodiments of the present invention have been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various changes and modifications may be made to the specific embodiments described above, and various combinations of the technical features and structures proposed by the present invention may be made without departing from the concept of the present invention.
Claims (10)
1. A thick helical blade composite forming method is characterized by comprising the following steps: a. blanking, namely calculating a blanking graph of a plane body helical blade blank according to a helical blade expansion calculation formula; b. heating the blank of the planar helical blade to convert crystals of the blank of the planar helical blade into austenite at high temperature; c. drawing a planar helical blade blank, fixing a first end of an inner hole notch edge of the high-temperature planar helical blade blank, drawing a second end of the inner hole notch edge by using hoisting equipment, extending an inner helical line of a helical blade to a required size, and primarily forming the planar helical blade blank into a helical blade; d. and placing the primary helical blade on a prefabricated helical die, and applying pressure to the prefabricated helical die by a press machine to press the primary helical blade into a standard thick helical blade.
2. The method for composite forming of thick helical blade as claimed in claim 1, wherein in step b, the planar helical blade blank is beveled before being heated.
3. The method of claim 2, wherein the welding groove is disposed on the inner side of the planar helical blade blank.
4. A thick helical blade composite forming method according to claim 1, wherein the heating of the planar helical blade blank in the step b is to 727-900 ℃ in a heating furnace.
5. The method for composite forming of thick helical blade of claim 1, wherein the material of the planar helical blade blanked in the step a is low carbon alloy steel.
6. The method for composite forming of thick helical blade according to claim 1, wherein the helical blade expansion calculation formula in step a is a calculation formula of a triangular algorithm.
7. The method for composite forming of thick helical blade as claimed in claim 1, wherein the first end of the inner hole notch edge of the planar helical blade blank in step C is fixed on an earth anchor, and the hoisting device is connected with the inner hole notch edge of the planar helical blade blank by a C-shaped open hook.
8. The method for composite forming of thick helical blade as claimed in claim 7, wherein the opening of the C-shaped open hook faces horizontally, and the opening of the C-shaped open hook matches the thickness of the planar helical blade blank.
9. The composite forming method for the thick helical blade as claimed in claim 1, wherein the prefabricated helical die comprises an upper die and a lower die, the lower end of the upper die and the upper end of the lower die are both provided with screw surfaces matched with the standard thick helical blade, and the upper end of the upper die is provided with a press machine.
10. A method for forming a thick helical blade as claimed in claim 1, wherein the standard thick helical blade after compression forming in step d is cooled to normal temperature at room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911137825.7A CN110814144B (en) | 2019-11-20 | 2019-11-20 | Composite forming method for thick helical blade |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911137825.7A CN110814144B (en) | 2019-11-20 | 2019-11-20 | Composite forming method for thick helical blade |
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| Publication Number | Publication Date |
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| CN110814144A true CN110814144A (en) | 2020-02-21 |
| CN110814144B CN110814144B (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523719A (en) * | 2021-07-10 | 2021-10-22 | 上海泽超实业有限公司 | Machining process of helical blade |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014079795A (en) * | 2012-10-18 | 2014-05-08 | Kyodo Alumi Kk | Helical structure and manufacturing method thereof |
| CN104492890A (en) * | 2014-12-25 | 2015-04-08 | 唐山四维智能科技有限公司 | Metal screw blade one-time forming machine and using method thereof |
| CN104843439A (en) * | 2015-05-07 | 2015-08-19 | 芜湖市爱德运输机械有限公司 | Machining method of screw blade |
| CN207447104U (en) * | 2017-10-25 | 2018-06-05 | 佛山新伦压力容器有限公司 | A kind of mold of shield machine helical blade |
-
2019
- 2019-11-20 CN CN201911137825.7A patent/CN110814144B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014079795A (en) * | 2012-10-18 | 2014-05-08 | Kyodo Alumi Kk | Helical structure and manufacturing method thereof |
| CN104492890A (en) * | 2014-12-25 | 2015-04-08 | 唐山四维智能科技有限公司 | Metal screw blade one-time forming machine and using method thereof |
| CN104843439A (en) * | 2015-05-07 | 2015-08-19 | 芜湖市爱德运输机械有限公司 | Machining method of screw blade |
| CN207447104U (en) * | 2017-10-25 | 2018-06-05 | 佛山新伦压力容器有限公司 | A kind of mold of shield machine helical blade |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523719A (en) * | 2021-07-10 | 2021-10-22 | 上海泽超实业有限公司 | Machining process of helical blade |
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| CN110814144B (en) | 2020-12-15 |
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