Thin-wall double-curvature titanium alloy thermal forming tool

Abstract

The utility model discloses a thin-wall double-curvature titanium alloy thermal forming tool, and belongs to the field of titanium alloy thermal forming. A V-shaped groove and a lower die datum hole are formed in the top surface of the lower die, a lower die positioning pin hole is formed in the corner of the top surface of the lower die, a positioning connecting pin is fixed in the lower die positioning pin hole, and a hiding hole is formed in the long slope profile of the V-shaped groove of the lower die; a V-shaped convex block matched with the V-shaped groove of the lower die is arranged on the bottom surface of the upper die; an upper die datum hole and an upper die positioning pin hole are formed in the positions, corresponding to the lower die datum hole and the lower die positioning pin hole, of the bottom face of the upper die, a material piece pin hole is formed in the long inclined face of the V-shaped protruding block of the upper die, the material piece pin hole corresponds to the avoiding hole, and a material piece positioning pin is fixedly installed in the material piece pin hole. The electric heating device is placed in the electric heating holes of the upper and lower dies; when the die is closed, the V-shaped protruding block is arranged in the V-shaped groove, the material piece positioning pin penetrates into the avoiding hole, and the positioning connecting pin tightly penetrates into the upper die positioning pin hole. The tool is used for thin-wall double-curvature titanium alloy thermal forming.

Description

TECHNICAL FIELD

[0001] The utility model belongs to titanium alloy hot forming technical field, concretely relates to a kind of thin-walled double curvature titanium alloy hot forming tool. BACKGROUND

[0002] In aircraft manufacturing, aircraft structural parts are various, which can be divided into metal parts and non-metal parts according to material types; can be divided into machined parts, sheet metal parts and composite parts according to forming methods. Titanium alloy material has high specific strength, low density, corrosion resistance, high temperature resistance and good plasticity, and plays an important role in aviation, shipbuilding, automobile, medical equipment and chemical industry.

[0003] Due to the above excellent performance of titanium alloy material, it is widely used in the key load-bearing parts of aircraft, especially in aircraft structural parts, titanium alloy thin-walled parts are more widely used. However, titanium alloy material itself has high strength, which leads to the difficulty in processing of its thin-walled parts in production process, and it is easy to deform. In addition, due to the high requirement for product shape precision, the product qualified rate is low, and the manufacturing cost is increased.

[0004] With the continuous development of aircraft manufacturing industry, the demand for titanium alloy parts is also increasing, how to reduce the manufacturing difficulty, improve production efficiency and quality has become the goal pursued by each manufacturer. CONTENT OF UTILITY MODEL

[0005] The utility model aims at solving the above problems existing in prior art, and provides a kind of thin-walled double curvature titanium alloy hot forming tool.

[0006] The utility model utilizes product shape design tool, and is divided into upper and lower die structure, solves the problem of part forming, and the upper and lower dies are positioned by two positioning pins, the positioning form is simple, and the positioning of upper and lower dies is more accurate.

[0007] To achieve the above object, the technical scheme adopted by the utility model is:

[0008] The utility model provides a thin -walled double curvature titanium alloy hot forming frock, including upper die, lower die and electric heating device, the top surface of lower die is plane, is equipped with 'V' type groove in the middle part of the top surface of lower die, is equipped with lower die datum hole on both sides of 'V' type groove of the top surface of lower die, is equipped with lower die positioning pin hole respectively in the diagonal of the top surface of lower die, is fixed with positioning connecting pin in lower die positioning pin hole, is equipped with dodge hole on the long slope surface of 'V' type groove of lower die, the bottom surface of upper die is plane, is equipped with 'V' type lug with 'V' type groove of lower die in the middle part of the bottom surface of upper die, is equipped with upper die datum hole and upper die positioning pin hole respectively in the corresponding position of upper die datum hole and upper die positioning pin hole of lower die datum hole and lower die positioning pin hole, is equipped with material sheet pin hole on the long slope surface of 'V' type lug of upper die, material sheet pin hole corresponds with dodge hole, is fixed with material sheet positioning pin in material sheet pin hole, and the sidewall of upper die and lower die is equipped with electric heating hole, and electric heating device is placed in electric heating hole,

[0009] When the mold is closed, the 'V' type lug of the upper die is matched and arranged in the 'V' type groove of the lower die, the material sheet positioning pin is inserted into the dodge hole, and the positioning connecting pin is tightly inserted into the upper die positioning pin hole.

[0010] Further, the upper die and the lower die are both cast from silicon-molybdenum spheroidal graphite cast iron.

[0011] Further, the positioning connecting pin is provided with an annular shoulder on the outer circumference thereof.

[0012] Further, the positioning connecting pin is made of 1Cr18Ni9Ti.

[0013] Further, the front and rear sidewalls of the upper die and the lower die are respectively provided with four mounting holes, the four mounting holes arranged on the front and rear sidewalls of the upper die are arranged in a matrix form, the four mounting holes arranged on the front and rear sidewalls of the lower die are arranged in a matrix form, and a cast-in lifting hook is fixedly installed in each mounting hole.

[0014] Further, the upper die is provided with an upper platform at the top end thereof, four upper long circular grooves are arranged on the left and right sides of the upper platform and arranged in a matrix form, the lower die is provided with a lower platform at the bottom end thereof, four lower long circular grooves are arranged on the left and right sides of the lower platform and arranged in a matrix form, and the four upper long circular grooves and the four lower long circular grooves are one-to-one corresponding.

[0015] Further, the electric heating device is a thermocouple, and the thermocouple is placed in the electric heating hole.

[0016] The utility model has the beneficial effects that:

[0017] 1) The frock is divided into upper and lower die structures, the frock structure is simple, the production parts are convenient to use, the frock production cost is low, the production difficulty is low, and the frock is convenient to process.

[0018] 2) The titanium alloy thin-walled part is difficult to process, and the deformation amount is large after forming, the deformation amount of the produced part can be reduced by heating the tooling and using the hot forming tooling in the production process, and the qualified rate of the titanium alloy part is improved.

[0019] 3) The upper and lower molds are positioned in the form of two-point positioning of positioning pins, the positioning mode is simple, the mold closing of the upper and lower molds is facilitated, and the positioning is accurate.

[0020] In summary, the tooling of the utility model is specially used for hot forming of titanium alloy thin-walled parts, aims to reduce manufacturing difficulty, reduce deformation, improve product qualified rate, and thus is more widely applied in the field of aircraft manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a thin-walled double curvature titanium alloy hot forming tooling axonometric view of the utility model;

[0022] Figure 2 is a thin-walled double curvature titanium alloy hot forming tooling front view of the utility model;

[0023] Figure 3 is a thin-walled double curvature titanium alloy hot forming tooling side view of the utility model;

[0024] Figure 4 is a thin-walled double curvature titanium alloy hot forming tooling top view of the utility model;

[0025] Figure 5 is a lower mold axonometric view;

[0026] Figure 6 is a lower mold front view;

[0027] Figure 7 is a lower mold top view;

[0028] Figure 8 is a lower mold side view;

[0029] Figure 9 is an upper mold axonometric view;

[0030] Figure 10 is an upper mold front view;

[0031] Figure 11 is an upper mold top view;

[0032] Figure 12 is an upper mold side view;

[0033] Figure 13 is a positioning connecting pin front view;

[0034] Figure 14 is a positioning connecting pin side view;

[0035] Figure 15 is a blank positioning pin axis drawing;

[0036] Figure 16 is a cast-in hook axis drawing.

[0037] The component names and reference signs involved in the above drawings are as follows:

[0038] upper die 01, lower die 02, positioning connecting pin 03, blank positioning pin 04, cast-in hook 05, 'V' groove 06, lower die reference hole 07, lower die positioning pin hole 08, avoidance hole 09, 'V' protrusion 10, upper die reference hole 11, upper die positioning pin hole 12, long inclined surface 13, blank pin hole 14, long slope surface 15, annular shoulder 16, upper long circular groove 17, lower long circular groove 18. DETAILED DESCRIPTION

[0039] As shown in Figures 1-16 , the embodiment discloses a thin-walled double-curvature titanium alloy hot forming tool, which comprises an upper die 01 (in a concave die structure), a lower die 02 (in a convex die structure) and an electric heating device.

[0040] The top surface of the lower die 02 is a plane, a 'V' groove 06 is formed in the middle of the top surface of the lower die 02, which is used for forming the shape of a part, lower die reference holes 07 are formed on both sides of the 'V' groove 06 on the top surface of the lower die 02, lower die positioning pin holes 08 are respectively formed at opposite corners of the top surface of the lower die 02, positioning connecting pins 03 are fixed in the lower die positioning pin holes 08, avoidance holes 09 are formed on the long slope surface 15 of the 'V' groove 06 of the lower die 02, the avoidance holes 09 are long circular holes and are used for avoiding the blank positioning pin 04 when the mold is closed, the bottom surface of the upper die 01 is a plane, a 'V' protrusion 10 matching the 'V' groove 06 of the lower die 02 is arranged in the middle of the bottom surface of the upper die 01, upper die reference holes 11 and upper die positioning pin holes 12 are respectively formed at positions corresponding to the lower die reference holes 07 and the lower die positioning pin holes 08 on the bottom surface of the upper die 01, blank pin holes 14 are formed on the long inclined surface 13 of the 'V' protrusion 10 of the upper die 01 and are used for installing the blank positioning pin 04, the blank pin holes 14 correspond to the avoidance holes 09, and the blank positioning pin 04 is fixed in the blank pin holes 14; electric heating holes are arranged in the side walls of the upper die 01 and the lower die 02, and the electric heating device is placed in the electric heating holes.

[0041] When the mold is closed, the 'V' protrusion 10 of the upper die 01 is arranged in the 'V' groove 06 of the lower die 02, the blank positioning pin 04 is inserted into the avoidance hole 09, and the positioning connecting pin 03 is tightly inserted into the upper die positioning pin hole 12.

[0042] The blank positioning pin 04 is a standard part (GB / T119.2-10x50), the blank positioning pin 04 is connected with the upper die 01 and is used for positioning a blank.

[0043] Further, the upper die 01 and the lower die 02 are both casted by silicon molybdenum spherulitic cast iron.

[0044] Further, an annular shoulder 16 is arranged on the outer circumference of the positioning connecting pin 03.

[0045] The positioning connecting pin 03 is used for connecting the upper die 01 and the lower die 02, and is in the form of a stepped pin, with a total length of 195 mm and diameters of Φ40g6, Φ46 and Φ40r6, respectively. The two sections of Φ40g6 and Φ46 are separated by the annular shoulder 16, wherein the section of Φ40g6 has a length of 142 mm and a beveled end, and the section of Φ40r6 has a length of 50 mm and is used for tightly fitting with the upper die positioning pin hole 12.

[0046] Further, the positioning connecting pin 03 is made of 1Cr18Ni9Ti (machined by a numerical control lathe).

[0047] Further, four mounting holes are arranged on the front and rear sidewalls of the upper die 01 and the lower die 02, respectively. The four mounting holes arranged on the front and rear sidewalls of the upper die 01 are arranged in a matrix form, and the four mounting holes arranged on the front and rear sidewalls of the lower die 02 are arranged in a matrix form. A cast-in lifting hook 05 is fixedly installed in each mounting hole.

[0048] The cast-in lifting hook 05 is a commercially available product CHF-25, which is used for lifting the tooling, connected with the upper die 01 and the lower die 02, and facilitates lifting and moving the tooling and saves cost.

[0049] Further, an upper platform is arranged at the top end of the upper die 01, and four upper long circular grooves 17 are arranged on the left and right sides of the upper platform in a matrix form. A lower platform is arranged at the bottom end of the lower die 02, and four lower long circular grooves 18 are arranged on the left and right sides of the lower platform in a matrix form. The four upper long circular grooves 17 and the four lower long circular grooves 18 are arranged one by one in a corresponding manner, and are used for connecting with the machine tool.

[0050] Further, the electric heating device is a thermocouple, which is placed in the electric heating hole.

[0051] The lower die 02 is a concave die structure, the profile part is the outer shape surface of the part, the lower die reference holes 07 are arranged on the outside of the profile, the lower die positioning pin holes 08 are arranged at the (maximum) diagonal of the die, the avoidance holes 09 are arranged on the long slope profile 15 of the 'V' type groove 06 of the lower die 02, which are used to avoid the material sheet positioning pin 04 during die closing. The lower die 02 is cast by silicon-molybdenum nodular cast iron, after the casting is completed and the casting stress is removed, the numerical control machine tool is programmed, and the five-axis machining center is used for machining, the top surface is machined first, the flatness of the top surface is ensured to be 0.1, then three lower die reference holes 07 with a diameter of 8 mm and a depth of 15 mm are machined, the lower die reference holes 07 are used as the reference to establish the coordinate system, and the profile part, the lower die positioning pin hole 08, the avoidance hole 09 (long circular hole), the lower long circular groove 18 (used for connecting with the machine tool), the electric heating hole (thermocouple placement hole), the mounting hole for mounting the cast-in lifting hook 05 and the like are machined respectively. Among them, the profile tolerance relative to the reference is ±0.1, the profile roughness is Ra1.6, and the lower die positioning pin hole 08 hole position tolerance relative to the lower die reference hole 07 hole position is ±0.05. The lower die positioning pin hole 08 is mainly used for connecting the positioning connecting pin 03, and the avoidance hole 09 is mainly used for avoiding the material sheet positioning pin 04 in the die closing state. The lower long circular groove 18 is used for connecting with the machine tool, positioning the tool and limiting six degrees of freedom of the tool, and the electric heating hole (thermocouple placement hole) is mainly used for placing the thermocouple probe, monitoring the temperature of the tool.

[0052] The upper die 01 is a convex die structure, the profile part is the inner shape surface of the part, the upper die reference holes 11 are arranged around the profile, the upper die positioning pin holes 12 are designed at the (maximum) diagonal of the upper die 01, the material sheet pin hole 14 is arranged on the long inclined surface 13 for mounting the material sheet positioning pin 04, the upper die 01 is cast by silicon-molybdenum nodular cast iron, after the casting is completed and the casting stress is removed, the numerical control machine tool is programmed, and the five-axis machining center is used for machining, the bottom surface is machined first, the flatness of the bottom surface is ensured to be 0.1, then three upper die reference holes 11 with a diameter of 8 mm and a depth of 15 mm (corresponding to the three lower die reference holes 07 one by one) are machined, the lower die reference holes 07 are used as the reference to establish the coordinate system, and the profile part, the upper die positioning pin hole 12, the material sheet pin hole 14, the upper long circular groove 17, the electric heating hole (thermocouple placement hole), the mounting hole for mounting the cast-in lifting hook 05 and the like are machined respectively. Among them, the profile tolerance relative to the reference is ±0.1, the profile roughness is Ra1.6, and the upper die positioning pin hole 12 hole position tolerance relative to the upper die reference hole 11 hole position is ±0.05. The upper die positioning pin hole 12 is mainly used for connecting with the positioning connecting pin 03, and the material sheet pin hole 14 is mainly used for connecting with the material sheet positioning pin 04. The upper long circular groove 17 is mainly used for connecting with the machine tool, positioning the tool and limiting six degrees of freedom of the tool, and the electric heating hole (thermocouple placement hole) is mainly used for placing the thermocouple probe, monitoring the temperature of the tool.

[0053] In use, the titanium alloy installation sheet is placed between the 'V' groove 06 and the 'V' protrusion 10, and the upper and lower molds are positioned and fixed together, the tool is heated and pressed, so that the titanium alloy material is hot formed, and the forming process is the prior art.

[0054] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the application concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A thin-walled dual curvature titanium alloy hot formed tooling characterized by: The mold comprises an upper mold (01), a lower mold (02) and an electric heating device. The top surface of the lower mold (02) is flat, a V-shaped groove (06) is arranged in the middle of the top surface of the lower mold (02), lower mold reference holes (07) are arranged on both sides of the V-shaped groove (06) of the top surface of the lower mold (02), lower mold positioning pin holes (08) are arranged at opposite corners of the top surface of the lower mold (02), positioning connecting pins (03) are fixed in the lower mold positioning pin holes (08), and an escape hole (09) is arranged on the long slope surface (15) of the V-shaped groove (06) of the lower mold (02). The bottom surface of the upper mold (01) is flat, a V-shaped protrusion (10) matched with the V-shaped groove (06) of the lower mold (02) is arranged in the middle of the bottom surface of the upper mold (01), upper mold reference holes (11) and upper mold positioning pin holes (12) are arranged on the bottom surface of the upper mold (01) at positions corresponding to the lower mold reference holes (07) and the lower mold positioning pin holes (08), respectively, a material sheet pin hole (14) is arranged on the long slope surface (13) of the V-shaped protrusion (10) of the upper mold (01), the material sheet pin hole (14) corresponds to the escape hole (09), a material sheet positioning pin (04) is fixed in the material sheet pin hole (14), and electric heating holes are arranged on the side walls of the upper mold (01) and the lower mold (02), and the electric heating device is arranged in the electric heating holes. When the mold is closed, the V-shaped protrusion (10) of the upper mold (01) is arranged in the V-shaped groove (06) of the lower mold (02), the material sheet positioning pin (04) is arranged in the escape hole (09), and the positioning connecting pin (03) is tightly arranged in the upper mold positioning pin hole (12).

2. A thin-walled dual curvature titanium alloy hot forming tooling fixture according to claim 1, wherein: The upper mold (01) and the lower mold (02) are both made of silicon-molybdenum spherulitic cast iron.

3. The thin-walled dual curvature titanium alloy superplastic forming tooling of claim 1, wherein: An annular shoulder (16) is arranged on the outer circumference of the positioning connecting pin (03).

4. A thin-walled dual curvature titanium alloy hot forming tooling set according to claim 1 or 3, wherein: The material of the positioning connecting pin (03) is 1Cr18Ni9Ti.

5. The thin-walled dual curvature titanium alloy superplastic forming tooling of claim 1, wherein: Four mounting holes are arranged on the front and rear side walls of the upper mold (01) and the lower mold (02), respectively, the four mounting holes arranged on the front and rear side walls of the upper mold (01) are arranged in a matrix form, the four mounting holes arranged on the front and rear side walls of the lower mold (02) are arranged in a matrix form, and a cast-in lifting hook (05) is fixedly arranged in each mounting hole.

6. The thin-walled dual curvature titanium alloy superplastic forming tooling of claim 1, wherein: An upper platform is arranged at the top end of the upper mold (01), four upper long circular grooves (17) are arranged on the left and right sides of the upper platform, and the four upper long circular grooves (17) are arranged in a matrix form; a lower platform is arranged at the bottom end of the lower mold (02), four lower long circular grooves (18) are arranged on the left and right sides of the lower platform, the four lower long circular grooves (18) are arranged in a matrix form, and the four upper long circular grooves (17) and the four lower long circular grooves (18) are arranged one by one in correspondence, and are used to be connected with a machine tool.

7. The thin-walled dual curvature titanium alloy superplastic forming tooling of claim 1, wherein: The electric heating device is a thermocouple, and the thermocouple is arranged in the electric heating hole.

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