CN112935059A - Titanium alloy U-shaped piece viscous medium room-temperature forming method - Google Patents
Titanium alloy U-shaped piece viscous medium room-temperature forming method Download PDFInfo
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- CN112935059A CN112935059A CN202110185175.4A CN202110185175A CN112935059A CN 112935059 A CN112935059 A CN 112935059A CN 202110185175 A CN202110185175 A CN 202110185175A CN 112935059 A CN112935059 A CN 112935059A
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- viscous medium
- plate blank
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/021—Deforming sheet bodies
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Forging (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a room temperature forming method of a viscous medium of a titanium alloy U-shaped piece, which comprises the following steps of I, placing a plate blank on a female die, and loading the plate blank through a rigid male die to realize preforming; removing the rigid male die to load the plate blank, taking the plate blank out of the female die, and polishing to enable the plate blank to become a preformed piece; mounting the preformed piece made of the plate blank into the female die again, mounting the injection die on the female die at the same time, and filling a viscous medium into the injection die; and IV, the plunger loads a viscous medium, the viscous medium flows out of the injection mold through an injection hole on the injection mold and contacts with the preformed piece made of the plate blank, and the viscous medium flowing out of the injection mold exerts forming force on the preformed piece made of the plate blank, so that the preformed piece made of the plate blank is gradually deformed and is finally tightly attached to the cavity in the female mold.
Description
Technical Field
The invention relates to the technical field of titanium alloy plate forming, in particular to a method for forming a viscous medium of a titanium alloy U-shaped piece at room temperature.
Background
The titanium alloy has the characteristics of high specific strength, heat resistance, corrosion resistance and no magnetism, and is widely applied to the fields of aviation, aerospace, weapons, ships and the like. However, titanium alloys have problems such as low yield and easy cracking in plastic forming, and are difficult to process. The existing titanium alloy plate forming method mainly comprises hot creep forming, hot press forming, superplastic forming, hot spinning forming and other hot processing forming technologies. The titanium alloy sheet material stamping forming method at room temperature is not yet in practical use, so that the development of a low-cost and high-efficiency titanium alloy room temperature forming process technology is required.
Therefore, in view of the above disadvantages, it is desirable to provide a method for forming titanium alloy U-shaped piece with viscous medium at room temperature.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem that the titanium alloy plate cannot be formed at room temperature.
(II) technical scheme
In order to solve the technical problem, the invention provides a titanium alloy U-shaped piece viscous medium room-temperature forming method, which comprises the following steps:
i, placing a plate blank on a female die, and loading the plate blank through a rigid male die to realize preforming;
removing the rigid male die to load the plate blank, taking the plate blank out of the female die, and polishing to enable the plate blank to become a preformed piece;
mounting the preformed piece made of the plate blank into the female die again, mounting the injection die on the female die at the same time, and filling a viscous medium into the injection die;
and IV, loading the viscous medium by a plunger, wherein the viscous medium flows out of the injection mold through an injection hole on the injection mold and is in contact with the preformed piece made of the slab blank, and applying a forming force to the preformed piece made of the slab blank by the viscous medium flowing out of the injection mold so that the preformed piece made of the slab blank is gradually deformed and finally is tightly attached to the cavity in the female mold to form the required U-shaped piece.
By adopting the technical scheme, the rigid mold is used for performing, then the viscous medium with proper performance is selected, the viscous medium injection mold is utilized for carrying out targeted loading on the non-mold-sticking area of the preformed piece, the injection pressure meets the forming requirement by designing the diameter of the injection hole, the resilience is small, the high-size precision titanium alloy U-shaped piece can be obtained, the room-temperature forming is realized, the heating is not needed, and the processing cost is reduced.
As a further illustration of the invention, the rigid male die is preferably a solid steel column terminated in a hemispherical shape.
By adopting the technical scheme, the titanium alloy plate blank can be conveniently deformed and is not easy to bend and break.
As a further illustration of the invention, it is preferred that the perimeter of the section line of the blank formed by the rigid punch is 1.2 times the perimeter of the section line of the blank finally formed by the injection mold.
By adopting the technical scheme, the viscous medium is convenient to deform the plate blank more easily in the dispersion loading process.
As a further illustration of the present invention, the slab is preferably polished to a smooth surface and is closely fitted around the cavity when placed in the female mold.
By adopting the technical scheme, the polishing is smooth, the polishing can be tightly attached to the cavity of the female die, the leakage of viscous media is avoided, and the attachment of the plate blank and the cavity avoids the uneven stress of the viscous media on the plate blanks at different positions caused by the movement of the plate blank.
As a further illustration of the invention, the viscous medium is preferably a high molecular weight polymer, the viscous medium having a molecular weight of from 350kg/mol to 900 kg/mol.
By adopting the technical scheme, the titanium alloy material with different numbers can be adapted, so that the applicability of the viscous medium is higher.
As a further description of the present invention, it is preferable that the injection mold has seven rows of injection holes distributed along the length direction thereof, a plurality of injection holes with the same diameter are distributed in each row of injection holes at intervals, and the axes of each row of injection holes converge to a point which is located on the axis of the injection mold.
By adopting the technical scheme, the viscous medium can be uniformly dispersed, and the viscous medium can be uniformly loaded on the plate blank.
As a further explanation of the invention, it is preferred that the aperture of the injection hole is from the injection mold axisThe lines are respectively d in the outer direction0、d1、d2、d1And d is0<d1<d2。
By adopting the technical scheme, the injection holes with different sizes are formed at different forming positions of different plate blanks, so that the pressure of the viscous medium can meet the forming requirements of different positions.
As a further illustration of the invention, it is preferred that the plunger speed is between 0.5mm/s and 2.5 mm/s.
By adopting the technical scheme, the stable forming of the titanium alloy can be ensured, and higher processing efficiency can be ensured.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
according to the invention, the titanium alloy plate U-shaped piece is formed at room temperature by adopting viscous medium forming, the preforming is carried out through a rigid die, then viscous medium with proper performance is selected, and the viscous medium is injected into the die to carry out targeted loading on the region of the preformed piece which is not attached with the die, the injection pressure meets the forming requirement by designing the diameter of the injection hole, the resilience is small, and the high-dimensional precision titanium alloy U-shaped piece can be obtained. Compared with the existing hot forming method, the method has the advantages of simple mold structure, easy realization of the process, realization of room-temperature forming of the titanium alloy plate, high efficiency and low cost.
Drawings
FIG. 1 is a diagram of the preform initial state of the present invention;
FIG. 2 is a view showing the preforming end state of the invention;
FIG. 3 is a diagram of a preformed object of the present invention;
FIG. 4 is a diagram of the initial state of final forming of the present invention;
FIG. 5 is a final intermediate state diagram of the present invention;
fig. 6 is a diagram showing a final forming end state of the present invention.
FIG. 7 is a block diagram of a final formed workpiece of the present invention;
in the figure: 1. a female die; 11. a cavity; 2. a rigid male die; 3. a sheet blank; 4. injecting into a mold; 41. an injection hole; 42. a plunger; 5. a viscous medium.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
A titanium alloy U-shaped piece viscous medium room-temperature forming method, which is combined with figures 1-7, and comprises the following steps:
i, placing a plate blank 3 on a female die 1, wherein the titanium alloy brand of the plate blank 3 is TA12, TA15, TC4 or TC 21; loading the plate blank 3 through the rigid male die 2 to realize preforming;
II, removing the loading of the rigid male die 2 on the plate blank 3, taking out the plate blank 3 from the female die 1 and polishing, wherein the plate blank 3 is polished to be smooth in surface and is tightly attached to the periphery of the cavity 11 when being placed into the female die 1; shaping the slab 3 into a preform; the slab material 3 is polished to be smooth, so that the subsequent particle loading direction of the viscous medium 5 can move along the expected loading direction, and the slab material 3 is attached to the cavity 11 to avoid uneven stress of the viscous medium 5 on the slab material 3 at different positions caused by movement of the slab material 3;
mounting the preformed piece made of the plate blank 3 into the female die 1 again, mounting the injection die 4 on the female die 1, and filling the viscous medium 5 in the injection die 4;
IV, the plunger 42 loads the viscous medium 5, and the speed of the plunger 22 is between 0.5mm/s and 2.5mm/s, so that the stable forming of the titanium alloy can be ensured, and the higher processing efficiency can be ensured; the viscous medium 5 flows out of the injection mold 4 through the injection hole 41 on the injection mold 4 and contacts with the preform made of the slab blank 3, and the viscous medium 5 flowing out of the injection mold 4 applies a forming force to the preform made of the slab blank 3, so that the preform made of the slab blank 3 is gradually deformed and finally closely attached to the cavity 11 in the female mold 1 to form a desired U-shaped member.
With reference to fig. 1 and 2, the female die 1 is a die with a similar U-shaped cavity 11 therein, and the rigid male die 2 is a solid steel column with a hemispherical end, so that the titanium alloy plate blank 3 can be deformed conveniently and is not easy to bend and break. In addition, the difference between the outer diameter of the rigid female die 2 and the inner diameter of the cavity 11 is two times of the thickness of the plate blank 3, the perimeter of the section line of the plate blank 3 formed by the rigid male die 2 is 1.2 times of the perimeter of the section line of the plate blank 3 finally formed by the injection die 4, and the proper perimeter difference of the section line gives enough extension allowance to the plate blank 3, so that the viscous medium 5 can enable the plate blank 3 to be deformed more easily in dispersive loading and meanwhile the plate blank 3 is not easy to rebound after extension forming.
With reference to fig. 4 to 6, the injection mold 4 is a steel cylindrical loading head, the head of the injection mold is also hemispherical, seven rows of injection holes 41 are distributed in the injection mold 4 along the length direction of the injection mold, a plurality of injection holes 41 with the same diameter are distributed in each row (in the direction perpendicular to the drawing paper surface) of the injection holes 41 at intervals, the axis of each row (in the direction parallel to the drawing paper surface) of the injection holes 41 converges to one point, and the point is located on the axis of the injection mold 4, so that the viscous medium 5 can be uniformly dispersed, and the viscous medium 5 can be uniformly loaded on the plate blank 3. According to the U-shaped member to be formed in the present application, the injection hole 41 of the injection mold 4 has a diameter d outward from the axis of the injection mold 40、d1、d2、d1Then there is d0<d1<d2The injection holes 41 with different sizes are formed at different forming positions of different plate blanks 3, so that the pressure of the viscous medium 5 can meet the forming requirements of different positions.
Referring to FIGS. 4-7, the viscous medium 5 is a high molecular weight polymer, and the molecular weight of the viscous medium 5 is 350kg/mol to 900 kg/mol. Wherein when the plate blank 3 is TC4, the molecular weight of the viscous medium 5 is 450 kg/mol-500 kg/mol; when the plate blank 3 is TA15 in the brand, the molecular weight of the viscous medium 5 is 550 kg/mol-650 kg/mol, the corresponding viscous medium 5 is adapted according to the titanium alloy materials of different brands, so that the plate blank 3 can be quickly formed, the plate blank 3 is loaded to be completely contacted with the cavity 11, and compared with rigid stamping, the viscous medium 5 with the corresponding molecular weight can effectively avoid springback, the size error of the finally formed plate blank 3 and the cavity 11 is not more than 0.001mm, the large-range molecular weight can be adapted to the titanium alloys of various brands, and the applicability of the viscous medium 5 is higher.
In conclusion, the viscous medium 5 is used for forming to realize the room-temperature forming of the titanium alloy plate U-shaped part, the pre-forming is carried out through a rigid die, then the viscous medium 5 with proper performance is selected, the viscous medium injection die 4 is used for carrying out targeted loading on the non-die-attached area of the pre-formed part, the injection pressure meets the forming requirement through designing the diameter of the injection hole 41, the rebound is small, and the high-dimensional-precision titanium alloy U-shaped part can be obtained. Compared with the existing hot forming method, the method has the advantages of simple mold structure, easy realization of the process, realization of the room-temperature forming of the titanium alloy plate, high efficiency (shortening by 30-45% compared with the hot forming processing time) and low cost (saving by 22-33% in electric energy consumption).
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A titanium alloy U-shaped piece viscous medium room temperature forming method is characterized in that: comprises the following steps of (a) carrying out,
i, placing a plate blank (3) on a female die (1), and loading the plate blank (3) through a rigid male die (2) to realize preforming;
II, removing the rigid male die (2) to load the plate blank (3), taking the plate blank (3) out of the female die (1) and polishing to enable the plate blank (3) to become a preformed piece;
mounting the preformed piece made of the plate blank (3) into the female die (1) again, mounting the injection die (4) on the female die (1), and filling the viscous medium (5) in the injection die (4);
and IV, a plunger (42) loads the viscous medium (5), the viscous medium (5) flows out of the injection mold (4) through an injection hole (41) on the injection mold (4) and is contacted with the preformed piece made of the plate blank (3), and the viscous medium (5) flowing out of the injection mold (4) applies forming force to the preformed piece made of the plate blank (3) so that the preformed piece made of the plate blank (3) is gradually deformed and is finally tightly attached to the cavity (11) in the female mold (1) to form a required U-shaped piece.
2. The titanium alloy U-shaped piece viscous medium room-temperature forming method according to claim 1, characterized in that: the rigid male die (2) is a solid steel column with a hemispherical end.
3. The titanium alloy U-shaped piece viscous medium room-temperature forming method as claimed in claim 2, wherein: the cross-sectional linear perimeter of the sheet metal blank (3) formed by the rigid male die (2) is 1.2 times the cross-sectional linear perimeter of the sheet metal blank (3) finally formed by the injection die (4).
4. The titanium alloy U-shaped piece viscous medium room-temperature forming method according to claim 1, characterized in that: the plate blank (3) is polished to be smooth in surface and is tightly attached to the periphery of the cavity (11) when being placed into the female die (1).
5. The titanium alloy U-shaped piece viscous medium room-temperature forming method according to claim 1, characterized in that: the viscous medium (5) is a high molecular polymer, and the molecular weight of the viscous medium (5) is 350 kg/mol-900 kg/mol.
6. The titanium alloy U-shaped piece viscous medium room-temperature forming method according to claim 1, characterized in that: the injection mould (4) is provided with seven rows of injection holes (41) along the length direction, a plurality of injection holes (41) with the same diameter are distributed in each row of injection holes (41) at intervals, and the axes of each row of injection holes (41) are converged to one point which is positioned on the axis of the injection mould (4).
7. A titanium alloy according to claim 6The method for forming the gold U-shaped piece by using the viscous medium at room temperature is characterized by comprising the following steps of: the diameters of the injection holes (41) are d from the axis of the injection mold (4) to the outside0、d1、d2、d1And d is0<d1<d2。
8. The titanium alloy U-shaped piece viscous medium room-temperature forming method according to claim 1, characterized in that: the plunger (42) speed is between 0.5mm/s and 2.5 mm/s.
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| CN109013816A (en) * | 2018-08-13 | 2018-12-18 | 吉林大学 | A kind of uniform spinning titanium or titanium alloy Board Forming process of cluster steel ball half module |
| CN109719187A (en) * | 2019-02-03 | 2019-05-07 | 哈尔滨工业大学 | A kind of antisymmetric reducing thin wall circumferential direction flowing forming device |
| CN110538915A (en) * | 2019-01-29 | 2019-12-06 | 中车长春轨道客车股份有限公司 | Rapid superplastic forming die and method for large-curved-surface plate ridge line of high-speed motor car |
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| JPH06510236A (en) * | 1991-07-23 | 1994-11-17 | エクストルード ホーン コーポレーション | How to form metal sheet material with a die |
| CN100999003A (en) * | 2006-12-29 | 2007-07-18 | 哈尔滨工业大学 | Viscous medium bidirection press cold shaping method of titanium and titanium alloy plate material parts |
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| CN112935059B (en) | 2022-03-29 |
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