CN215697677U - Self-adaptive positioning structure of undercarriage forging - Google Patents
Self-adaptive positioning structure of undercarriage forging Download PDFInfo
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- CN215697677U CN215697677U CN202120677945.2U CN202120677945U CN215697677U CN 215697677 U CN215697677 U CN 215697677U CN 202120677945 U CN202120677945 U CN 202120677945U CN 215697677 U CN215697677 U CN 215697677U
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Abstract
The utility model discloses a self-adaptive positioning structure of an undercarriage forging, belongs to the field of forging, and aims to realize accurate, efficient, safe and stable positioning of an undercarriage prefabricated blank. The die comprises a die cavity, wherein the die cavity comprises a positioning groove and a forming cavity; the inner wall of the positioning groove is an inclined plane gradually contracted from the top of the groove to the bottom of the groove; the top opening of the positioning groove is matched with the maximum outline of the parting surface of the pre-forging piece, and a groove bottom gap is formed between the groove bottom of the positioning groove and the outer wall of the prefabricated blank. The groove top opening of the positioning groove is matched with the maximum outline of the parting surface of the pre-forging piece, so that an operator can easily place the prefabricated blank into the positioning groove of the die cavity of the lower die, the inner wall of the positioning groove can play a role in guiding the prefabricated blank, the prefabricated blank can automatically move towards the center of the lower die by relying on dead weight through the guiding effect of the inner wall of the positioning groove, the defect of manual positioning is overcome, and automatic, accurate, rapid and safe positioning of the prefabricated blank is realized.
Description
Technical Field
The utility model belongs to the field of forging, and particularly relates to a self-adaptive positioning structure of an undercarriage forging.
Background
The landing gear is one of five major core parts of an airplane, is an important support system for taking off, landing, ground sliding and parking of the airplane as an important safety functional part of the airplane, is a main bearing component of the airplane, and absorbs and dissipates impact energy formed by the airplane and the ground in the landing and sliding processes so as to ensure the use safety of the airplane in the ground movement process. Because the landing gear of the airplane is stressed seriously, the working environment is severe and the failure rate is high, the requirement of the modern airplane on the landing gear is higher and higher. The core problem of manufacturing high-performance aircraft landing gear is not only net strength and rigidity, or buffering and swing reduction in the landing and ground running processes, but also how to realize long service life, high reliability and low-cost manufacturing; the most critical part of the parts of the landing gear is the landing gear outer cylinder, and the manufacturing of the high-reliability landing gear outer cylinder die forging is the primary condition for realizing the high-performance landing gear forging.
In order to realize the high-performance, long-service-life and low-cost manufacture of the landing gear, the landing gear forging is developed towards integration, complication and large-scale, and the used material has excellent comprehensive properties such as high strength, high toughness, good fatigue resistance, corrosion resistance and the like, and meanwhile, the manufacturing process of the landing gear forging needs to be stable and strong and has high reliability. Landing gear typically uses 300M, A-100 steel; ti1023, TC18 titanium alloy and other materials, wherein an aircraft landing gear forging is made of ultra-high strength A-100 steel. The A-100 steel is the ultrahigh strength steel with the best comprehensive performance at present, and is an ideal material for manufacturing high-performance landing gears. But the key technical indexes of the material, namely mechanical property and grain size, are sensitive to deformation and forging fire number in the forging process. The stability of the forging process is a key factor for guaranteeing the undercarriage forging, and in the actual production process, the positioning process of the prefabricated blank is the most important factor for the forging success or failure because the program control press is adopted for die forging production.
Currently, for this type of complex landing gear forging, the preform blank is usually trimmed by a certain amount of machining so that it can be smoothly placed in the cavity of the preforging die. At present, as shown in fig. 5, the inner wall of the preforging die cavity is a tapered surface which gradually shrinks inwards from top to bottom, and the preforging positioning of the precast blank in the preforging die cavity is usually performed by visual inspection of a field operator, and the positioning mode not only needs a long time to adjust the blank position, but also has poor positioning precision. If the prefabricated blank is a large undercarriage prefabricated blank, the operator needs to move the position through the loading and unloading machine, and the required time is longer. Meanwhile, due to the complexity of the undercarriage forging piece, the problems of toppling of the produced prefabricated blank, uneven front and back and the like are easily caused in the positioning process of the prefabricated blank in the pre-forging die cavity of the undercarriage forging piece, so that the positioning time is greatly prolonged, even the temperature of the rear prefabricated blank is too low, the subsequent die pressing process cannot be carried out, and serious consequences such as reheating, repositioning and the like are caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems of low positioning efficiency and poor positioning precision of the existing prefabricated blank through manual visual inspection positioning, and provides a self-adaptive positioning structure of an undercarriage forging, so that the accurate, efficient, safe and stable positioning of the undercarriage prefabricated blank is realized.
The technical scheme adopted by the utility model is as follows: the self-adaptive positioning structure of the undercarriage forging comprises a die cavity arranged on a pre-forging die, wherein the die cavity comprises a positioning groove at the top and a forming cavity at the bottom of the positioning groove along the axial direction of the die cavity;
the inner wall of the positioning groove is an inclined plane gradually contracted from the top of the groove to the bottom of the groove; the opening of the top of the positioning groove is matched with the maximum outline of the parting surface of the pre-forging piece, and a groove bottom gap is formed between the groove bottom of the positioning groove and the outer wall of the prefabricated blank;
and a transition step which is retracted from the bottom of the positioning groove to the middle part of the mold cavity is arranged between the inner surface of the molding cavity and the bottom of the positioning groove.
Furthermore, an outer arc-shaped transition area which protrudes outwards and is in an arc shape is arranged at the bottom of the positioning groove;
the top of the forming cavity is provided with an inner arc-shaped transition area which protrudes inwards and is in an arc shape;
the outer arc transition area is circumscribed with the inner arc transition area.
Further, the radius of the outer arc transition area is r; the radius of the inner arc transition area is R; r is more than or equal to 80mm and less than or equal to 200mm, and R is more than or equal to 15mm and less than or equal to 50 mm.
Furthermore, the mold stripping inclination of the positioning groove is beta, and the beta is more than or equal to 5 degrees and less than or equal to 15 degrees.
Furthermore, the depth of the positioning groove is b, and b is more than or equal to 30mm and less than or equal to 60 mm.
Further, the gap at the bottom of the groove is d; the width of the bottom of the positioning groove is f; the width of the prefabricated blank is e; f is e + d; and d is more than or equal to 1mm and less than or equal to 3 mm.
The utility model has the beneficial effects that:
the inner wall of the positioning groove is arranged in an inclined plane, so that an operator can easily place the prefabricated blank into the positioning groove of the die cavity of the lower die, the inner wall of the positioning groove can automatically guide the prefabricated blank, and the prefabricated blank can automatically move towards the center of the lower die through the guiding effect of the inner wall of the positioning groove, so that the automatic positioning of the prefabricated blank is realized.
Due to the existence of the groove bottom clearance between the groove bottom of the positioning groove and the outer wall of the prefabricated blank, and the small groove bottom clearance, after the prefabricated blank falls into the positioning groove, the central line of the prefabricated blank and the central line of the die cavity of the lower die are basically superposed in the horizontal direction, so that accurate positioning is realized;
due to the arrangement of the transition steps, the horizontal lifting effect is achieved on the prefabricated blank, so that the prefabricated blank can be completely supported on the transition steps and is kept in a correct position without inclination. And in the initial stage of pressing down the upper die, the prefabricated blank is stably supported on the transition step, so that the prefabricated blank does not have the phenomena of sliding, inclination, deviation and the like in the subsequent pressing process.
Because the arc-shaped inner arc transition area which protrudes inwards in the forming cavity is arranged, the supporting range of the prefabricated blank is enlarged, the included angle formed by the tangent line of the contact position of the inner arc transition area and the prefabricated blank and the horizontal line is small, the horizontal lifting effect is better, and the prefabricated blank inclination resistance is stronger; and the requirement on the tolerance precision of the width of the prefabricated blank is also reduced, so that the deformation uniformity of the prefabricated blank in the die forging process is better.
Drawings
FIG. 1 is a schematic view of the lower mold structure of the present invention;
FIG. 2 is a schematic view of the positioning of the preform blank of the present invention on a pre-forging die;
FIG. 3 is a cross-sectional view of the pre-forge;
FIG. 4 is an enlarged view of a portion of FIG. 2;
fig. 5 is a prior art schematic.
In the figure, a die cavity 1, a positioning groove 1A, a forming cavity 1B, a transition step 1C, an outer arc transition area 1C1, an inner arc transition area 1C2, a groove bottom gap 2, a pre-forging piece 3, a prefabricated blank 4, a pre-forging piece 5, an upper die 6 and a lower die 7.
Detailed Description
The utility model is further described below with reference to the accompanying drawings:
the landing gear forging self-adaptive positioning structure comprises a die cavity 1 arranged on a pre-forging die, and the die cavity 1 comprises a positioning groove 1A at the top and a forming cavity 1B at the bottom of the positioning groove 1A along the axial direction of the die cavity 1, as shown in FIGS. 1, 2, 3 and 4;
the inner wall of the positioning groove 1A is an inclined plane gradually contracted from the top of the groove to the bottom of the groove; the opening of the top of the positioning groove 1A is matched with the maximum outline of the parting surface of the pre-forging, and a groove bottom gap 2 is arranged between the groove bottom of the positioning groove 1A and the outer wall of the prefabricated blank 4;
a transition step 1C which is retracted from the bottom of the positioning groove 1A to the middle of the mold cavity 1 is arranged between the inner surface of the molding cavity 1B and the bottom of the positioning groove 1A.
The utility model discloses a self-adaptive positioning structure of an undercarriage forging, wherein a groove top opening of a positioning groove 1A is matched with the maximum outline of a split surface of a pre-forging, namely the width of the groove top opening of the positioning groove 1A is W, the width of the maximum outline of the split surface of the pre-forging is W, and W is equal to W. Because the inner wall of positioning groove 1A is the inclined plane setting, its drawing die inclination beta, beta is more than or equal to 5 is less than or equal to 15 for the groove top opening of positioning groove 1A is greater than the width e of the prefabricated blank 4 of preforging piece, thereby make the operator very easily put prefabricated blank 4 into the positioning groove 1A of the mould cavity 1 of lower mould 7, the inner wall of positioning groove 1A can play the guide effect to prefabricated blank 4, prefabricated blank 4 passes through the guide effect of positioning groove 1A inner wall, can move to lower mould 7 center automatically, realize the automatic accurate location of prefabricated blank.
A groove bottom gap 2 is arranged between the groove bottom of the positioning groove 1A and the outer wall of the prefabricated blank 4, if the groove bottom gap 2 is d, the width of the groove bottom of the positioning groove 1A is f, and the width of the prefabricated blank is e, f is e + d, and d is not less than 1mm and not more than 3 mm. Due to the existence of the groove bottom clearance 2 and the small groove bottom clearance, after the prefabricated blank 4 falls into the positioning groove 1A, the central line of the prefabricated blank 4 is basically superposed with the central line of the mold cavity 1 of the lower mold 7 in the horizontal direction, and accurate positioning is realized.
The transition step 1C in the die cavity 1 of the lower die 7 plays a horizontal lifting role on the prefabricated blank 4, so that the prefabricated blank 4 can be completely supported on the transition step 1C after falling into the positioning groove 1A, and the normal position is kept without inclination. And in the initial stage of the pressing down of the upper die 6, the prefabricated blank 4 is stably supported on the transition step 1C, so that the prefabricated blank 4 does not have the phenomena of sliding, inclination, deviation and the like in the subsequent pressing process.
The forming cavity 1B may adopt a conventional inclined plane that is retracted from top to bottom, and a round angle is directly guided between the top end of the forming cavity and the bottom of the positioning groove 1A to form a transition step 1C. In the utility model, the groove bottom of the positioning groove 1A is provided with an outward convex arc-shaped outer arc-shaped transition region 1C 1; the top of the molding cavity 1B is provided with an inward-protruding arc-shaped inner arc transition area 1C 2; the outer arcuate transition region 1C1 circumscribes the inner arcuate transition region 1C 2. By adopting the structure, the supporting range of the inner arc transition region 1C2 on the prefabricated blank 4 is enlarged, the included angle formed by the tangent line of the contact position of the inner arc transition region 1C2 and the prefabricated blank 4 and the horizontal line is small, the horizontal lifting effect is better, and the prefabricated blank 4 inclination resistance is stronger; the requirement on the tolerance precision of the width of the prefabricated blank 4 is also reduced, so that the deformation uniformity of the prefabricated blank 4 in the die forging process is better; the outer arc transition region 1C1 is matched to limit the prefabricated blank 4, so that the phenomena of sliding, inclination, deviation and the like of the prefabricated blank 4 in the initial pressing process can be further avoided.
The sizes of the outer arc transition area 1C1 and the inner arc transition area 1C2 comprehensively consider the stress of a die, the deformation uniformity of blanks and the positioning effect, and for the forged piece of which the diameter of the rod part of the forged piece of the landing gear is 150-300 mm, the radius of the outer arc transition area 1C1 is r; the radius of the inner arc transition region 1C2 is R; r is more than or equal to 80mm and less than or equal to 200mm, and R is more than or equal to 15mm and less than or equal to 50 mm.
The depth of the positioning groove 1A is too shallow, so that the prefabricated blank 1 is difficult to place into the positioning groove 1A, the automatic positioning is not facilitated, in order to be more beneficial for an operator to smoothly place the prefabricated blank 1 into the positioning groove 1A and enable the prefabricated blank 1 to be automatically positioned by the self weight under the guidance of the positioning groove 1A, the depth of the positioning groove 1A is b, and b is more than or equal to 30mm and less than or equal to 60 mm; the mold stripping inclination of the positioning groove 1A is beta, and the beta is more than or equal to 5 degrees and less than or equal to 15 degrees.
Claims (6)
1. Undercarriage forging self-adaptation location structure, including setting up mould cavity (1) on the preforging mould, its characterized in that: the die cavity (1) comprises a positioning groove (1A) at the top and a forming cavity (1B) at the bottom of the positioning groove (1A) along the axial direction of the die cavity;
the inner wall of the positioning groove (1A) is an inclined plane gradually contracted from the top of the groove to the bottom of the groove; the groove top opening of the positioning groove (1A) is matched with the maximum outline of the parting surface of the pre-forging, and a groove bottom gap (2) is arranged between the groove bottom of the positioning groove (1A) and the outer wall of the prefabricated blank (4);
a transition step (1C) which is retracted from the bottom of the positioning groove (1A) to the middle of the mold cavity (1) is arranged between the inner surface of the molding cavity (1B) and the bottom of the positioning groove (1A).
2. The landing gear forging self-adaptive positioning structure of claim 1, wherein: an outwards convex arc-shaped outer arc-shaped transition area (1C1) is arranged at the bottom of the positioning groove (1A);
the top of the molding cavity (1B) is provided with an inward-protruding arc-shaped inner arc transition area (1C 2);
the outer arc transition zone (1C1) is circumscribed with the inner arc transition zone (1C 2).
3. The landing gear forging self-adaptive positioning structure of claim 2, wherein: the radius of the outer arc-shaped transition region (1C1) is r; the radius of the inner arc transition area (1C2) is R; r is more than or equal to 80mm and less than or equal to 200mm, and R is more than or equal to 15mm and less than or equal to 50 mm.
4. The landing gear forging self-adaptive positioning structure of claim 1, 2 or 3, wherein: the mold stripping inclination of the positioning groove (1A) is beta, and the beta is more than or equal to 5 degrees and less than or equal to 15 degrees.
5. The landing gear forging self-adaptive positioning structure of claim 4, wherein: the depth of the positioning groove (1A) is b, and b is more than or equal to 30mm and less than or equal to 60 mm.
6. The landing gear forging self-adaptive positioning structure of claim 5, wherein: the groove bottom clearance (2) is d; the width of the bottom of the positioning groove (1A) is f; the width of the prefabricated blank is e; f is e + d; and d is more than or equal to 1mm and less than or equal to 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120677945.2U CN215697677U (en) | 2021-04-02 | 2021-04-02 | Self-adaptive positioning structure of undercarriage forging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120677945.2U CN215697677U (en) | 2021-04-02 | 2021-04-02 | Self-adaptive positioning structure of undercarriage forging |
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| Publication Number | Publication Date |
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| CN215697677U true CN215697677U (en) | 2022-02-01 |
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| CN202120677945.2U Active CN215697677U (en) | 2021-04-02 | 2021-04-02 | Self-adaptive positioning structure of undercarriage forging |
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- 2021-04-02 CN CN202120677945.2U patent/CN215697677U/en active Active
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