Hot forming die for titanium alloy sheet metal part of U-shaped structure

Abstract

The invention provides a thermoforming die for a titanium alloy sheet metal part of a U-shaped structure, and belongs to the technical field of thermoforming of titanium sheet metal parts. The problem that the side wall of an existing U-shaped structure titanium alloy sheet metal part is prone to being scratched in the hot pressing forming process is solved. The die comprises a die body, a guide mechanism and a leveling mechanism, the die body comprises a female die and a male die which are matched with each other, the top of the male die is provided with a male die molded surface area, the bottom of the female die is provided with a female die molded surface area matched with the male die molded surface area, the guide mechanism comprises four guide strips, and the guide strips are matched with the female die molded surface area. The four guide strips are arranged on the two sides of the two ends of the male die profile area respectively, and the leveling mechanism comprises a leveling instrument, an upper leveling bolt, a lower leveling bolt, an upper datum plane and a lower datum plane. The device is mainly used for hot pressing forming of the titanium alloy sheet metal part of the U-shaped structure.

Description

Technical Field

[0001] The invention belongs to the technical field of hot pressing forming of titanium alloy sheet metal parts, and in particular relates to a hot forming die for a titanium alloy sheet metal part with a U-shaped structure. Background Art

[0002] U-shaped high-drawing ratio structural titanium alloy sheet metal parts are often used in the fairings on the outside of aircraft. Such parts are usually manufactured by hot pressing. Since the height of the two side walls of the U-shaped structure of such parts is generally more than 180mm, and the verticality of the side walls and the bottom surface is strictly required, and the levelness of the upper and lower platforms of the hot pressing forming equipment deteriorates after a period of use, and the upper platform will vibrate during the ascent, the above factors will cause the side walls of the U-shaped titanium alloy sheet metal parts to be easily scratched during the hot pressing process. Summary of the invention

[0003] In view of this, the present invention aims to propose a U-shaped titanium alloy sheet metal hot forming die to solve the problem that the side wall of the existing U-shaped titanium alloy sheet metal is easily scratched during the hot pressing forming process.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a U-shaped structure titanium alloy sheet metal hot forming mold, which includes a mold body, a guide mechanism and a leveling mechanism, the mold body includes a matching die and a punch, the top of the punch is provided with a convex model surface area, the bottom of the die is provided with a concave model surface area matching with the convex model surface area, the guide mechanism includes four guide bars, the four guide bars are respectively arranged on both sides of the two ends of the convex model surface area, the guide bars and the convex model surface area are an integral structure, the leveling mechanism includes a level ruler, an upper leveling bolt, a lower leveling bolt, an upper reference plane and a lower reference plane, the upper reference plane and the lower reference plane are both used in conjunction with the level ruler, the outer ends of the die and both sides of the middle are provided with upper reference planes, the bottom ends of the punch are provided with lower reference planes, the number of the upper leveling bolts and the lower leveling bolts are both four, the four upper leveling bolts are symmetrically distributed on both sides of the top of the die, and the four lower leveling bolts are symmetrically distributed on both sides of the bottom of the punch.

[0005] Furthermore, both ends of the concave model surface area of ​​the concave mold are provided with guide grooves matching with the guide strips.

[0006] Furthermore, the side surface of the guide strip protrudes from the vertical surface of the punch surface area of ​​the punch.

[0007] Furthermore, the dimension of the vertical surface of the side surface of the guide strip protruding from the convex mold surface area of ​​the punch is greater than the wall thickness of the part.

[0008] Furthermore, both side edges of the top of the convex model surface area are rounded, and the top surface of the guide strip is higher than the bottom of the rounded corner.

[0009] Furthermore, a positioning pin is arranged at the top of one end of the male model surface area of ​​the male mold, and a positioning groove matching with the positioning pin is opened at one end of the female model surface area of ​​the female mold.

[0010] Furthermore, weight-reducing grooves are provided on the top and both sides of the die.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention provides a U-shaped structure titanium alloy sheet metal hot forming die, which is provided with matching concave and convex dies, and guide mechanisms formed integrally with the convex die are provided on both sides of the two ends of the convex mold surface area of ​​the convex die. Since the guide strip is formed integrally with the convex die, the guide strip has high structural strength and is not easy to deform during the hot pressing process. There is no assembly gap between the guide strip and the convex die, which can avoid the problem of poor guiding accuracy caused by the matching gap. At the same time, the guide is higher than the vertical mold surface area of ​​the convex die, ensuring that the mold guide can play a good alignment role on the mold convex and concave dies in advance before the part is formed, and ensures that the concave die and the convex die can always be aligned during the mold closing process to prevent the concave die from scratching the side wall of the part during the mold closing process;

[0013] 2. The present invention provides a U-shaped structure titanium alloy sheet metal hot forming mold, which is provided with a leveling mechanism. The upper reference plane and the lower reference plane are respectively set on the die and the punch, and the levelness of the die and the punch is checked with a spirit level. The die and the punch are leveled respectively by the upper leveling bolt and the lower leveling bolt to ensure the levelness of the mold, thereby avoiding scratches on the side walls of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of a hot forming die for a U-shaped titanium alloy sheet metal part according to the present invention;

[0016] Figure 2 This is a schematic structural diagram of a punch in a hot forming die for a U-shaped titanium alloy sheet metal part according to the present invention;

[0017] Figure 3 It is an enlarged schematic diagram of a partial structure of a punch in a hot forming die for a U-shaped titanium alloy sheet metal part described in the present invention.

[0018] 1-die, 2-punch, 3-die surface area, 4-die surface area, 5-guide strip, 6-level, 7-upper leveling bolt, 8-lower leveling bolt, 9-upper reference plane, 10-lower reference plane, 11-locating pin, 12-weight reduction groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0020] See also Figure 1-3 The present embodiment is described as a U-shaped titanium alloy sheet metal hot forming die, which includes a die body, a guide mechanism and a leveling mechanism, wherein the die body includes a matching concave die 1 and a convex die 2, the top of the convex die 2 is provided with a convex model surface area 4, the bottom of the concave die 1 is provided with a concave model surface area 3 that matches the convex model surface area 4, the guide mechanism includes four guide strips 5, the four guide strips 5 are respectively provided on both sides of the two ends of the convex model surface area 4, the guide strips 5 and the convex model surface area 4 are integrally formed, and the leveling mechanism includes a horizontal Ruler 6, upper leveling bolts 7, lower leveling bolts 8, upper reference plane 9 and lower reference plane 10, the upper reference plane 9 and the lower reference plane 10 are both connected with the level ruler 6, upper reference planes 9 are provided at both ends of the outer side of the die 1 and both sides of the middle, lower reference planes 10 are provided at both ends of the bottom of the punch 2, the number of the upper leveling bolts 7 and the number of the lower leveling bolts 8 are both four, the four upper leveling bolts 7 are symmetrically distributed on both sides of the top of the die 1, and the four lower leveling bolts 8 are symmetrically distributed on both sides of the bottom of the punch 2.

[0021] In the present embodiment, a matching die 1 and punch 2 are provided, and guide strips 5 integrally formed with the punch 2 are provided on both sides of the two ends of the convex mold surface area 4 of the punch 2. The guide mechanism of the existing mold is mostly a split structure independent of the mold, and the strength of the guide mechanism is poor. During the hot pressing process, due to the high forming temperature, the guide is very easy to deform, and there is an assembly gap between the original guide and the mold during the installation process, which affects the guiding effect. In the present embodiment, since the guide strip 5 is an integral structure with the punch 2 and the punch 2 has a high structural strength, the structural strength of the guide strip 5 is also high, and it is not easy to deform during the hot pressing process. There is no assembly gap between the guide strip 5 and the punch 2, which can avoid the problem of poor guiding accuracy caused by the existence of a matching gap. At the same time, the guide is higher than the vertical mold surface area of ​​the punch. The purpose is to ensure that before the part is formed, the mold guide can play a good alignment role on the mold convex and concave molds in advance, and ensure that the die and the punch can always be aligned during the mold closing process to prevent the die from scratching the side wall of the part during the mold closing.

[0022] In this embodiment, a leveling mechanism is provided, by respectively setting an upper reference plane 9 and a lower reference plane 10 on the die 1 and the punch 2, and cooperating with a spirit level 6 to check the levelness of the die 1 and the punch 2, and respectively leveling the die 1 and the punch 2 by means of an upper leveling bolt 7 and a lower leveling bolt 8, to ensure the levelness of the upper and lower molds, thereby avoiding scratches on the side walls of the parts.

[0023] In this embodiment, the level ruler 6 can be placed against the corresponding upper reference plane 9 and lower reference plane 10 for detection according to actual detection position requirements.

[0024] In this embodiment, both ends of the concave model surface area 3 of the concave mold 1 are provided with guide grooves matching with the guide strips 5.

[0025] In this embodiment, the side of the guide strip 5 is protruded from the side wall of the convex mold surface area 4 of the punch 2. The size of the side of the guide strip 5 protruding from the side wall of the convex mold surface area 4 of the punch 2 is slightly larger than the wall thickness of the part. In this embodiment, the wall thickness of the part is 1.0 mm, and the actual protruding size of the guide strip 5 is 1.050 mm. +0.05 The guide strip 5 is set to this size so that when the die 1 falls and is closed with the punch 2, even if the die 1 is not aligned with the punch 2, the die 1 will not scratch the side wall of the part, but will first contact with the guide strip 5 of the protruding surface, thereby protecting the part.

[0026] In this embodiment, both side edges of the top of the convex model surface area 4 are rounded, and the top surface of the guide strip 5 is higher than the lower part of the rounded corner. The purpose of designing this structure is to ensure that the guide strip 5 can align the die 1 and the punch 2 of the mold in advance before the part is formed.

[0027] In this embodiment, a positioning pin 11 is arranged at the top of one end of the convex model surface area 4 of the punch 2, and a positioning groove matching with the positioning pin 11 is opened at one end of the concave model surface area 3 of the concave mold 1. The positioning pin 11 cooperates with the positioning groove to position and limit the sheet metal.

[0028] In this embodiment, weight-reducing grooves 12 are provided on the top and both sides of the concave mold 1. The weight-reducing grooves 12 are used to reduce the weight of the mold and save the mold cost.

[0029] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A hot forming die for a U-shaped titanium alloy sheet metal part, characterized in that: It comprises a mould body, a guide mechanism and a levelling mechanism. The mould body comprises a matching concave mould (1) and a convex mould (2). The top of the convex mould (2) is provided with a convex mould surface area (4). The bottom of the concave mould (1) is provided with a concave mould surface area (3) matching with the convex mould surface area (4). The guide mechanism comprises four guide bars (5). The four guide bars (5) are respectively arranged on both sides of the two ends of the convex mould surface area (4). The guide bars (5) and the convex mould surface area (4) are an integral structure. The levelling mechanism comprises a level ruler (6), an upper levelling bolt (7), and a lower levelling bolt (8). (8), an upper reference plane (9) and a lower reference plane (10), the upper reference plane (9) and the lower reference plane (10) are used in conjunction with a level ruler (6), the upper reference planes (9) are arranged at both ends of the outer side and both sides of the middle of the die (1), the lower reference planes (10) are arranged at both ends of the bottom of the punch (2), the number of the upper leveling bolts (7) and the number of the lower leveling bolts (8) are both four, the four upper leveling bolts (7) are symmetrically distributed on both sides of the top of the die (1), and the four lower leveling bolts (8) are symmetrically distributed on both sides of the bottom of the punch (2).

2. A U-shaped titanium alloy sheet metal hot forming die according to claim 1, characterized in that: Both ends of the concave model surface area (3) of the concave mold (1) are provided with guide grooves matching with the guide strips (5).

3. The U-shaped titanium alloy sheet metal hot forming die according to claim 1, characterized in that: The side surface of the guide strip (5) protrudes from the vertical surface of the convex mold surface area (4) of the punch (2).

4. A U-shaped structure titanium alloy sheet metal hot forming die according to claim 3, characterized in that: The dimension of the side surface of the guide strip (5) protruding from the vertical surface of the convex mold surface area (4) of the punch (2) is greater than the wall thickness of the part.

5. A U-shaped titanium alloy sheet metal hot forming die according to claim 4, characterized in that: Both sides of the top of the convex model surface area (4) are rounded, and the top surface of the guide strip (5) is higher than the bottom of the rounded corner.

6. The U-shaped titanium alloy sheet metal hot forming die according to claim 1, characterized in that: A positioning pin (11) is provided at the top of one end of the convex model surface area (4) of the convex mold (2), and a positioning groove matching the positioning pin (11) is provided at one end of the concave model surface area (3) of the concave mold (1).

7. The U-shaped titanium alloy sheet metal hot forming die according to claim 1, characterized in that: The top and both sides of the die (1) are provided with weight-reducing grooves (12).

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