A hot forming die and forming method for a titanium alloy thin-walled part

Abstract

The application relates to the technical field of machining, in particular to a hot forming die for a titanium alloy thin-wall part, which comprises a lower die, an upper die and four sliding rods, the four sliding rods are fixedly connected at four corners of the lower surface of the upper die respectively, the bottom ends of the sliding rods are inserted into the lower die, and the hot forming die further comprises a thermocouple coil, an ejection mechanism and an anti-falling mechanism, the thermocouple coil is embedded on the outside of the die cavity of the lower die and is used for heating the workpiece in the die cavity; the ejection mechanism is arranged in the inner cavity of the lower die; the anti-falling mechanism is transversely arranged at the top end of the front surface of the lower die; the ejection mechanism comprises guide rails, a sliding base, a push plate, guide grooves, ejector pins, guide columns and hydraulic oil cylinders, the number of the guide rails is two, and the guide rails are fixedly connected at the front and rear ends of the bottom of the inner cavity of the lower die respectively; the sliding base is sleeved on the outer wall of the guide rails and can slide leftward and rightward. The upper die is prevented from falling, the upper die is prevented from falling to hurt the staff, safety is achieved, the workpiece is discharged from the die, the workpiece is conveniently taken down, and the operation difficulty of the staff is reduced.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a thermoforming mold and forming method for thin-walled titanium alloy parts. Background Technology

[0002] Titanium alloys have been widely used in aerospace, chemical and shipbuilding industries due to their low density (approximately 4.5 g / cm3), high specific strength and specific fracture toughness, good fatigue strength and crack propagation resistance, good low-temperature toughness, and strong corrosion resistance.

[0003] Since conventional cold working methods are insufficient for forming thin-walled titanium alloy parts, hot forming is necessary. Hot forming is a pressure processing technique that involves heating a metal material to below its recrystallization temperature, utilizing the material's increased plasticity and reduced resistance to deformation at high temperatures to manufacture parts.

[0004] To save manufacturing costs and control workpiece forming quality, invention application number 201410261083X discloses a thermoforming mold for TC4 titanium alloy angular thin-walled parts, including a lower mold A and an upper mold B. Both molds are made of medium-silicon molybdenum ductile iron, and their surfaces include multiple similar part profiles. Two rows of angular profiles are formed between the lower mold A and the upper mold B, used to place the sheet metal to be stamped. Guide slide grooves are provided on both molds, with the upper mold B equipped with a guide slide. Because the workpiece is thin-walled, it is difficult to find protruding parts on the lower mold A, making it difficult for workers to remove the workpiece by hand. Furthermore, in the field of press forming, the upper mold B is often driven by a hydraulic press. Failures in the hydraulic press control system or operator error can cause the upper mold B to descend, potentially injuring workers during workpiece handling, resulting in low safety. Therefore, it is necessary to propose a highly safe thermoforming mold for titanium alloy thin-walled parts. Summary of the Invention

[0005] In order to overcome the shortcomings of existing technologies, such as time-consuming and labor-intensive parts handling and the lack of anti-falling upper mold, the present invention aims to solve the technical problem of a thermoforming mold and forming method for thin-walled titanium alloy parts.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a thermoforming mold for thin-walled titanium alloy parts, comprising a lower mold, an upper mold, and four sliding rods. The four sliding rods are respectively fixedly connected to the four corners of the lower surface of the upper mold, and the bottom ends of the sliding rods are inserted into the lower mold. The mold also includes a thermocouple coil, an ejection mechanism, and a fall prevention mechanism. The thermocouple coil is embedded in the outer side of the lower mold cavity for heating the workpiece inside the cavity. The ejection mechanism is disposed in the inner cavity of the lower mold. The fall prevention mechanism is horizontally installed at the top front of the lower mold.

[0007] The purpose is to eject the workpiece from the lower mold cavity, allowing workers to remove the workpiece quickly and easily. The ejection mechanism includes guide rails, a slide block, a push plate, a guide groove, an ejector pin, a guide post, and a hydraulic cylinder. Two guide rails are fixedly connected to the front and rear ends of the bottom of the lower mold cavity. The slide block is slidably fitted onto the outer wall of the guide rails. The push plate is horizontally mounted on the top of the slide block, and guide grooves are formed on its upper surface from left to right. The ejector pin is inserted into the lower mold cavity, and its upward movement ejects the workpiece from the cavity. The guide post is mounted on the bottom end of the ejector pin and inserted into the guide groove cavity. One end of the hydraulic cylinder is mounted on the left inner wall of the lower mold, and the other end is connected to the left end of the push plate.

[0008] Preferably, the guide groove is inclined to the right from top to bottom.

[0009] Preferably, the purpose is to limit the sliding rod to prevent the upper mold from falling when picking up or placing workpieces, thereby improving safety. The anti-fall mechanism includes a box, a knob, a rotating cylinder, a limiting post, a sleeve, a slot, a spring, a ball bearing, and a crossbar. The box is horizontally fixed to the top of the front of the lower mold. The knob, which can rotate around its own axis via a bearing, is installed at the center of the front of the box. The rotating cylinder is installed at the rear end of the knob, and two slots are formed on the outer wall of the rotating cylinder. There are two limiting posts, which are respectively installed at the left and right ends of the front side of the inner cavity of the box. The sleeve can slide back and forth and is fitted onto the outer wall of the limiting post. The sleeve can move backward and enter the lower mold. The outer wall of the limiting post is rectangular to prevent the sleeve from rotating. Slots are formed at both the top and bottom ends of the inner wall of the sleeve. The spring and the ball bearing are inserted into the inner cavity of the limiting post from the inside to the outside. Under the action of the spring force, the ball bearing moves outward and inserts into the inner cavity of the slot to position the sleeve. One end of the crossbar is horizontally installed on the inner side of the sleeve, and the other end is inserted into the inner cavity of the slot.

[0010] Preferably, the two grooves are distributed on the outer wall of the rotating cylinder in a left-right opposite manner, and the grooves are arc-shaped.

[0011] Preferably, the maximum length of the ball extending out of the inner cavity of the limiting post is less than its own radius.

[0012] Preferably, the cross-section of the crossbar is circular.

[0013] A method for forming a titanium alloy thin-walled part using a thermoforming die includes the following steps:

[0014] Step 1: The upper and lower molds are fixed at the upper and lower ends of the press, respectively. The workpiece to be formed is placed in the lower mold cavity. The thermocouple coil is energized to heat the workpiece, achieving preheating before pressing. Under the condition of the sliding rod's movement trajectory of the upper mold, the press drives the upper mold to descend. The upper mold presses down on the workpiece in the lower mold cavity, realizing the thermoforming of the workpiece.

[0015] Step 2: When it is necessary to prevent the upper mold from falling, after the press drives the upper mold, the slide bar moves to the top of the anti-fall mechanism. The knob drives the rotating cylinder to rotate clockwise, and the inner wall of the slide groove presses the crossbar to the rear, thereby causing the sleeve to move to the rear along the limit post and reach directly below the slide bar. Under the action of the spring force, the ball is pushed to insert into the slot located on the front side, positioning the sleeve after displacement. The sleeve blocks the slide bar from falling, thereby achieving the function of preventing the upper mold from falling.

[0016] Step 3: When removing the workpiece, the guide rail supports the slide block, and the hydraulic cylinder drives the push plate to move to the right. The inclined surface at the bottom of the guide groove presses the guide post upward, which in turn causes the ejector pin to enter the lower mold cavity and push the workpiece out, making it easy to remove.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The rotary knob drives the drum to rotate clockwise. The slide groove and crossbar cooperate to move the sleeve along the limit post to the rear. When the sleeve moves to the bottom of the slide bar, the spring pushes the ball to insert into the slot, positioning the sleeve and preventing the upper mold from falling and injuring the staff. This ensures safe use.

[0019] 2. The hydraulic cylinder drives the push plate to move to the right. Through the cooperation of the guide groove and the guide pillar, the ejector pin moves upward, so that the workpiece is ejected from the lower mold cavity, which makes it easier to remove the workpiece and reduces the difficulty of operation for the staff. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a front sectional view of the lower mold of the present invention;

[0022] Figure 3 This is a top sectional view of the fall protection mechanism of the present invention;

[0023] Figure 4 This is an enlarged view of point A in the present invention;

[0024] Figure 5 This is a schematic diagram of the rotating drum structure of the present invention.

[0025] In the diagram: 1. Lower mold; 2. Upper mold; 3. Slide rod; 4. Thermocouple coil; 5. Ejection mechanism; 6. Anti-fall mechanism; 51. Guide rail; 52. Slide block; 53. Push plate; 54. Guide groove; 55. Ejector pin; 56. Guide post; 57. Hydraulic cylinder; 61. Box body; 62. Knob; 63. Rotary cylinder; 64. Slide groove; 65. Limiting post; 66. Sleeve; 67. Slot; 68. Spring; 69. Ball bearing; 610. Crossbar. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] This invention provides a technical solution: a thermoforming mold for thin-walled titanium alloy parts, such as... Figure 1-5 As shown, it includes a lower mold 1, an upper mold 2, and four sliding rods 3. The lower mold 1 is installed at the bottom of the press, and the upper mold 2 is installed at the top of the press. The press moves the upper mold 2 downward. The lower mold 1 and the upper mold 2 cooperate to press the workpiece into shape. The four sliding rods 3 are respectively installed at the four corners of the lower surface of the upper mold 2. The sliding rods 3 are inserted into the lower mold 1 and constrain the movement trajectory of the upper mold 2. A thermocouple coil 4 is embedded in the outer side of the mold cavity of the lower mold 1. The thermocouple coil 4 is energized to heat the workpiece in the mold cavity of the lower mold 1. An ejection mechanism 5 is provided in the inner cavity of the lower mold 1. A fall prevention mechanism 6 is installed on the top front of the lower mold 1.

[0028] The strip-shaped workpiece is placed in the cavity of the lower mold 1. The thermocouple coil 4 is energized to heat the workpiece, achieving preheating before pressing. Under the condition of saving the movement trajectory of the upper mold 2 by the slide rod 3, the press drives the upper mold 2 to descend. The upper mold 2 presses down on the workpiece in the cavity of the lower mold 1, realizing the thermoforming of the workpiece.

[0029] As a preferred embodiment, the ejection mechanism 5 further includes two guide rails 51 fixedly connected to the front and rear ends of the bottom of the inner cavity of the lower mold 1. A slide block 52 capable of sliding left and right is sleeved on the outer wall of the guide rails 51. A push plate 53 is installed at the top of the slide block 52. Guide grooves 54 are equidistantly opened from left to right on the upper surface of the push plate 53. An ejector pin 55 is inserted into the mold cavity of the lower mold 1. The ejector pin 55 can eject the workpiece in the mold cavity of the lower mold 1 by moving upward. A guide post 56 is installed at the bottom end of the ejector pin 55. The guide post 56 is inserted into the inner cavity of the guide groove 54. One end of a hydraulic cylinder 57 is installed on the left inner wall of the lower mold 1. The other end of the hydraulic cylinder 57 is connected to the left end of the push plate 53. The guide groove 54 is inclined to the right from top to bottom. When the push plate 53 moves left and right, the guide groove 54 can squeeze the guide post 56 to move downward or upward.

[0030] When the workpiece is removed, due to the support of the guide rail 51 on the slide block 52, the hydraulic cylinder 57 drives the push plate 53 to move to the right. The bottom slope of the guide groove 54 presses the guide post 56 upward, thereby causing the ejector pin 55 to enter the lower mold cavity 1 and eject the workpiece, so that the workpiece can be easily removed.

[0031] When the push plate 53 is driven to move to the left by the hydraulic cylinder 57, the guide post 56 is pressed down on the inner wall of the guide groove 54, and the ejector pin 55 moves out of the lower mold cavity 1, preparing for the workpiece to be processed again.

[0032] As a preferred embodiment, the fall protection mechanism 6 further includes a box 61 horizontally fixed to the top front of the lower mold 1. A knob 62, capable of rotating around its own axis, is mounted at the center of the front of the box 61 via a bearing. A rotating cylinder 63 is mounted at the rear end of the knob 62. Two sliding grooves 64 are formed on the outer wall of the rotating cylinder 63. Rectangular limiting posts 65 are installed at both the left and right ends of the front side of the inner cavity of the box 61. A sleeve 66, capable of sliding back and forth, is fitted onto the outer wall of the limiting post 65. The sleeve 66 can move rearward and extend into the lower mold 1. The shape of the limiting post 65 itself can restrict the rotation of the sleeve 66. The inner wall of the sleeve 66... Both ends are provided with slots 67. A spring 68 and a ball 69 are respectively inserted into the inner cavity of the limiting post 65 from the inside to the outside. Under the action of the spring 68, the ball 69 is pushed into the inner cavity of the slot 67 to position the sleeve 66. The maximum length of the ball 69 extending out of the inner cavity of the limiting post 65 is less than its own radius. When the sleeve 66 moves back and forth, the ball 69 can naturally disengage from the slot 67. One end of the crossbar 610 is installed inside the sleeve 66. The other end of the crossbar 610 is inserted into the inner cavity of the slide groove 64. The longitudinal section of the crossbar 610 is circular. The crossbar 610 can slide smoothly in the slide groove 64 by utilizing its own curved surface.

[0033] When it is necessary to prevent the upper mold 2 from falling, after the press drives the upper mold 2, the slide bar 3 moves to the top of the anti-fall mechanism 6. The knob 62 drives the rotating cylinder 63 to rotate clockwise. The inner wall of the slide groove 64 presses the crossbar 610 to the rear, thereby causing the sleeve 66 to move to the rear along the limiting post 65 and reach directly below the slide bar 3. Under the action of the spring 68, the ball 69 is pushed into the slot 67 located on the front side, positioning the sleeve 66 after displacement. The sleeve 66 blocks the slide bar 3 from falling, thereby achieving the function of preventing the upper mold 2 from falling.

[0034] When the limit on the slide bar 3 is released, the rotating drum 63 is rotated counterclockwise by the knob 62, the slide groove 64 presses the crossbar 610 to move forward, and the sleeve 66 moves out from the lower mold 1, so that the upper mold 2 can be lowered again.

[0035] As a preferred option, two sliding grooves 64 are distributed on the outer wall of the rotating cylinder 63 from left to right and opposite to each other. The sliding grooves 64 are arc-shaped. When the rotating cylinder 63 rotates clockwise or counterclockwise, the curved surface of the inner wall of the sliding groove 64 can press the crossbar 610 forward or backward, so as to achieve the purpose of moving the sleeve 66 back and forth.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermoforming mold for thin-walled titanium alloy parts, comprising a lower mold (1), an upper mold (2), and four sliding rods (3), wherein the four sliding rods (3) are respectively fixedly connected to the four corners of the lower surface of the upper mold (2), and the bottom ends of the sliding rods (3) are inserted into the lower mold (1), characterized in that, Also includes: Thermocouple coil (4) is embedded in the outer side of the lower mold (1) cavity and is used for heating the workpiece inside the mold cavity; Ejection mechanism (5) is provided in the inner cavity of the lower mold (1); A fall protection mechanism (6) is horizontally installed on the top front of the lower mold (1); The ejection mechanism (5) includes: Two guide rails (51) are fixedly connected to the front and rear ends of the bottom of the lower mold (1) cavity respectively; The slide (52) is sleeved on the outer wall of the guide rail (51) and can slide left and right. A push plate (53) is horizontally installed at the top of the slide block (52), and guide grooves (54) are provided on the upper surface of the push plate (53) from left to right. Ejector pin (55) is inserted into the cavity of the lower mold (1). The ejector pin (55) moves upward to eject the workpiece from the cavity of the lower mold (1). A guide post (56) is installed at the bottom end of the ejector pin (55), and the guide post (56) is inserted into the inner cavity of the guide groove (54); The hydraulic cylinder (57) is installed at one end on the left inner wall of the lower mold (1) and at the other end connected to the left end of the push plate (53); The fall protection mechanism (6) includes: The box body (61) is horizontally fixed to the top front of the lower mold (1); A knob (62) is mounted at the center of the front of the housing (61) and is rotatable about its own axis via a bearing; A rotating cylinder (63) is installed at the rear end of the knob (62), and two sliding grooves (64) are provided on the outer wall of the rotating cylinder (63). Two limiting posts (65) are installed on the left and right ends of the front side of the inner cavity of the box (61); The sleeve (66) can slide back and forth on the outer wall of the limiting post (65). The sleeve (66) can move to the rear side to enter the lower mold (1). The outer wall of the limiting post (65) is rectangular to prevent the sleeve (66) from rotating. The upper and lower ends of the inner wall of the sleeve (66) are provided with slots (67). Spring (68) and ball (69) are inserted into the inner cavity of the limiting post (65) from the inside to the outside. Under the action of the spring (68), the ball (69) moves outward and inserts into the inner cavity of the slot (67) to position the sleeve (66). The crossbar (610) is installed horizontally on the inner side of the sleeve (66) at one end and inserted into the inner cavity of the slide groove (64) at the other end. The two slide grooves (64) are distributed on the outer wall of the rotating cylinder (63) in opposite directions, and the slide grooves (64) are arc-shaped. When the rotating cylinder (63) rotates clockwise or counterclockwise, the curved surface of the inner wall of the slide groove (64) can press the crossbar (610) forward or backward, so as to achieve the purpose of moving the sleeve (66) back and forth.

2. The thermoforming mold for thin-walled titanium alloy parts according to claim 1, characterized in that, The guide groove (54) is inclined to the right from top to bottom.

3. The thermoforming mold for thin-walled titanium alloy parts according to claim 2, characterized in that, The maximum length of the ball (69) extending out of the inner cavity of the limiting post (65) is less than its own radius.

4. The thermoforming mold for thin-walled titanium alloy parts according to claim 3, characterized in that, The cross section of the crossbar (610) is circular.

5. The forming method of a thermoforming die for a thin-walled titanium alloy part according to claim 4, characterized in that, Includes the following steps: Step 1: The upper mold (2) and the lower mold (1) are fixed at the upper and lower ends of the press respectively. The forming workpiece is placed in the cavity of the lower mold (1). The thermocouple coil (4) is energized to heat the workpiece to achieve preheating before pressing. Under the condition of the sliding rod (3) moving along the trajectory of the upper mold (2), the press drives the upper mold (2) to descend. The upper mold (2) presses down on the workpiece in the cavity of the lower mold (1) to achieve thermoforming of the workpiece. Step 2: When it is necessary to prevent the upper mold (2) from falling, after the press drives the upper mold (2), the slide bar (3) moves to the top of the anti-fall mechanism (6). The knob (62) drives the rotating cylinder (63) to rotate clockwise. The inner wall of the slide groove (64) presses the crossbar (610) to the rear, thereby causing the sleeve (66) to move along the limit post (65) to the rear and reach directly below the slide bar (3). Under the elastic force of the spring (68), the ball (69) is pushed to insert into the slot (67) located on the front side, positioning the sleeve (66) after displacement. The sleeve (66) blocks the slide bar (3) from falling, thereby achieving the function of preventing the upper mold (2) from falling. Step 3: When removing the workpiece, due to the support of the guide rail (51) on the slide (52), the hydraulic cylinder (57) drives the push plate (53) to move to the right. The bottom slope of the guide groove (54) presses the guide post (56) upward, thereby causing the ejector pin (55) to enter the mold cavity of the lower mold (1) and eject the workpiece, so that the workpiece can be easily removed.

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