Vertical finishing forging die dedicated to deep blind hole double-shaft gear blank

Abstract

The present invention discloses a vertical finish forging die specifically for deep blind hole double coupling gear blank parts, which includes an upper convex die block, a lower concave die block, a knockout mechanism, an upper punch, a left half die and a right half die. Opening and closing cylinders are respectively arranged on the outer sides of the left and right half dies and can be opened and closed under the action of the opening and closing cylinders. The upper convex die block, the upper punch, the left half die, the right half die and the lower concave die block can jointly enclose a finish forging die cavity. The finish forging die cavity includes a deep blind hole, a large gear position cavity in the upper part, a small gear position cavity in the lower part and a cylindrical shape with a draft angle at the bottom, and the small gear position cavity in the lower part is directly opposite to the interface between the left and right half dies and the lower concave die block; An elastic locking device is also installed below the upper template, and the elastic locking device includes a locking sleeve, a sliding rod and a compression spring. As an important part in the vertical forging process of double coupling gear blank parts, this finish forging die provides a guarantee for realizing vertical forging, reducing processes, saving material costs and machining costs.

Description

Technical Field

[0001] The present invention relates to the technical field of forging dies, and particularly to a finish forging die used in the forging process of a double-shaft gear blank with deep blind holes. Background Art

[0002] As Figure 4 shown in the double-shaft gear with deep blind holes, the traditional manufacturing method is to first use horizontal forging. However, deep blind holes cannot be forged by horizontal forging, and only the double-shaft gear blank in a full-core state can be forged; after forging, the deep blind holes are completed by machining. In addition, horizontal forging also requires trimming, increasing the cost of a set of trimming dies, resulting in a long process flow, high material costs, and high subsequent machining costs. Summary of the Invention

[0003] The present invention aims to provide a finish forging die used in the vertical forging process of a double-shaft gear blank, which is used to perform finish forging on the blank after material collection and pre-forging. As an important process of the whole set of forging dies, it provides a guarantee for realizing vertical forging, reducing processes, saving material costs and machining costs.

[0004] To this end, the technical solution adopted by the present invention is as follows: a vertical finish forging die dedicated to a double-shaft gear blank with deep blind holes, including an upper convex module fixedly installed below the upper template, a lower concave module fixedly installed above the lower template, and a knockout mechanism vertically extending into the bottom of the cavity of the lower concave module. An upper punch is installed in the middle of the upper convex module. A left half die and a right half die are arranged above the lower concave module. Opening and closing cylinders are respectively equipped on the outer sides of the left and right half dies and can be opened and closed under the action of the opening and closing cylinders. The upper convex module, the upper punch, the left half die, the right half die, and the lower concave module can jointly enclose a finish forging die cavity. The finish forging die cavity includes a deep blind hole, a large gear position cavity in the upper part, a small gear position cavity in the lower part, and a cylindrical shape with a draft angle at the bottom. The small gear position cavity in the lower part is directly opposite to the interface between the left and right half dies and the lower concave module. An elastic locking device is also installed below the upper template. The elastic locking device includes a locking sleeve, a sliding rod, and a compression spring. The upper end of the sliding rod is fixed on the upper template. The compression spring and the locking sleeve are slidably sleeved on the sliding rod up and down.

[0005] When the left and right half dies are closed and the upper template drives the upper convex module, the upper punch, the upper module pressing ring, and the elastic locking device to descend to the effective working stroke of the finish forging die, the inner conical surface of the locking sleeve can be in full contact with the outer conical surface of the left and right half dies, thereby locking the left and right half dies. When the upper template continues to descend, the compression spring is further compressed, while the locking sleeve remains stationary, and the locking force increases. The upper convex module and the upper punch continue to descend. The upper punch penetrates into the finish forging die cavity and fills the material in the lower small gear position cavity of the blank. The upper convex module and the upper punch continue to descend until the upper convex module contacts the left and right half dies, and the blank is completed for finish forging.

[0006] Preferably in the above solution, the upper convex module adopts an internal and external split structure, including an upper convex die body and an upper convex die outer sleeve, and the bottom surface of the upper convex die outer sleeve is higher than the bottom surface of the upper convex die body. When the mold is closed, the upper convex die body is inserted between the left and right half molds, and the bottom surface of the upper convex die outer sleeve contacts the top surfaces of the left and right half molds. The replacement frequency of the upper convex die body is higher than that of the upper convex die outer sleeve. The split structure is adopted to reduce the use cost; the contact surface between the upper convex die outer sleeve and the left and right half molds is moved upward relative to the bottom surface of the upper convex die body, further avoiding the generation of flash.

[0007] More preferably, both the upper punch and the upper convex die body are provided with upper end heads, and are sleeved together from the inside to the outside through the upper end heads and then inserted into the upper convex die positioning seat. The upper convex die outer sleeve presses on the step surface of the upper convex die body and is locked on the upper convex die positioning seat through screws. The upper convex die positioning seat is locked on the upper template through screws, so as to realize the installation of the upper convex module on the upper template; the lower concave module is provided with a lower end head, which is inserted into the lower concave die positioning seat, the lower concave die positioning seat is inserted into the lower template, the lower module pressing ring presses on the step surface of the lower concave module and is locked on the lower template through screws, so as to realize the installation of the lower concave module on the lower template. The upper convex module adopts a split structure, does not need to open holes on the upper convex die body, improves the strength of the upper convex die body, adopts a structure of reverse buckling of the step surface and is combined with screw locking for installation, which is very convenient; the lower concave module adopts a lower module pressing ring and is combined with screws for installation and fixation on the lower template, avoiding opening holes on the lower concave module, ensuring the strength of the lower module itself, and at the same time enabling the replacement of different molds on the lower module, with good versatility, convenient and fast installation, and stable and reliable.

[0008] More preferably, a lower cushion block is arranged between the lower concave die positioning seat and the lower template. Since the lower module is the main load-bearing component in the forging process and has high strength requirements, adding a cushion block and replacing the cushion block during use instead of replacing the lower template further improves the service life of the lower template.

[0009] More preferably, the ejector mechanism adopts a split structure, including a lower ejector block and an ejector rod. The lower end of the lower ejector block is provided with an anti-detachment protrusion, and the upper end of the ejector rod abuts against the anti-detachment protrusion. The stroke range of the anti-detachment protrusion is between the lower concave module and the lower cushion block. The ejector rod is a commonly used component on a press. Adopting a split structure is equivalent to only adding a lower ejector block to the existing press, thus achieving universality.

[0010] More preferably, at least two sets of guiding mechanisms are arranged between the upper template and the lower template, and each set of guiding mechanisms is composed of a guide sleeve and a guide post.

[0011] Further preferably, the elastic locking device further includes a locking sleeve positioning plate and a sliding sleeve. The locking sleeve positioning plate is fixedly sleeved outside the locking sleeve. The locking sleeve positioning plate is slidably mounted on the sliding rod through the sliding sleeve and locked against detachment by a nut, thereby realizing the sliding mounting of the locking sleeve on the sliding rod.

[0012] Further preferably, the front end of the opening and closing cylinder is connected to the corresponding left and right half - dies through a connecting block. The rear end of the opening and closing cylinder is fixed on the column of the "L" - shaped cylinder mounting seat. The bottom plate of the cylinder mounting seat is mounted on the lower template through a cylinder positioning seat.

[0013] The beneficial effects of the present invention are as follows: The upper convex module, the upper punch, the left half - die, the right half - die and the lower concave module can jointly enclose the final forging die cavity. The final forging die cavity includes a deep blind hole, a large gear position cavity in the upper part, a small gear position cavity in the lower part and a cylindrical shape with a draft angle at the bottom. And the small gear position cavity in the lower part is opposite to the interface between the left and right half - dies and the lower concave module. It can not only ensure that the blank with two gear positions and a deep blind hole is formed by final forging, but also ensure smooth demoulding. It is an important part in the vertical forging process of the double - shaft gear with a deep blind hole. This final forging die is applied to the vertical forging of the double - shaft gear blank with a deep blind hole, improving the forging quality, reducing the processes, and saving the material cost and machining cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention.

[0015] Figure 2 is Figure 1 the A - A cross - sectional view of

[0016] Figure 3 is a schematic diagram of the blank formed by final forging of the present invention.

[0017] Figure 4 is a schematic structural diagram of the machined double - shaft gear with a deep blind hole.

[0018] Figure 5 is a process flow chart of the vertical forging of the double - shaft gear blank with a deep blind hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further illustrates the present invention through embodiments in conjunction with the drawings:

[0020] Combined with Figure 1 , Figure 2As shown in the figure, a vertical finish forging die dedicated to a deep blind hole double-shaft gear blank mainly consists of an upper template 1, an upper convex die block 2, a lower template 3, a lower concave die block 4, a lower concave die positioning seat 5, an upper convex die positioning seat 6, a lower die block pressing ring 7, a cylinder positioning seat 8, a lower ejector block 9, a knockout rod 10, a lower cushion block 11, a guide sleeve 12, a guide post 13, an upper punch 14, a cylinder mounting seat 15, a left half die 16, a right half die 17, an opening and closing cylinder 18, a slide bar 19, a compression spring 20, a locking sleeve positioning plate 21, a sliding sleeve 22, a connecting block 23, and a locking sleeve 24.

[0021] The upper convex die block 2 is fixedly installed below the upper template 1, and the lower concave die block 4 is fixedly installed above the lower template 3. The knockout mechanism can vertically extend into the bottom of the cavity of the lower concave die block 4 for ejecting the formed blank. The upper punch 14 is installed in the middle of the upper convex die block 2.

[0022] The left half die 16 and the right half die 17 are arranged above the lower concave die block 4. The left half die 16 and the right half die 17 are respectively equipped with an opening and closing cylinder 18 on the outside, and the left half die 16 and the right half die 17 can be opened and closed (separated or closed) under the drive of their respective corresponding opening and closing cylinders 18.

[0023] The upper convex die block 2, the upper punch 14, the left half die 16, the right half die 17, and the lower concave die block 4 can jointly enclose a finish forging die cavity. The finish forging die cavity is used to form a finish forging blank. The finish forging die cavity includes a deep blind hole, a large gear position cavity in the upper part, a small gear position cavity in the lower part, and a cylindrical shape with a draft angle at the bottom, and the small gear position cavity in the lower part is opposite to the parting surface of the left half die 16, the right half die 17 and the lower concave die block 4, ensuring that after the left half die 16 and the right half die 17 are separated, the blank can be smoothly demolded under the action of the knockout mechanism.

[0024] An elastic locking device is also installed below the upper template 1. The elastic locking device mainly consists of a locking sleeve 24, a slide bar 19, and a compression spring 20. The upper end of the slide bar 19 is fixed on the upper template 1, and the compression spring 20 and the locking sleeve 24 are slidably sleeved on the slide bar 19 up and down.

[0025] When the left half die 16 and the right half die 17 are closed, and the upper template 1 drives the upper convex die block 2, the upper punch 14, the upper die block pressing ring 6 and the elastic locking device to move downward to the effective working stroke h1 of the finish forging die, the inner conical surface of the locking sleeve 24 can be in full contact with the outer conical surfaces of the left half die 16 and the right half die 17, thereby locking the left half die 16 and the right half die 17 to prevent them from separating. When the upper template 1 continues to move downward, the compression spring 20 is further compressed, while the locking sleeve 24 remains stationary, the locking force increases, the upper convex die block 2 and the upper punch 14 continue to move downward, the upper punch 14 penetrates into the finish forging die cavity and fills the cavity of the lower pinion position of the blank with material. The upper convex die block 2 and the upper punch 14 continue to move downward until the upper convex die block 2 contacts the left half die 16 and the right half die 17, and the blank completes the finish forging forming.

[0026] Preferably, the upper convex die block 2 adopts an internal and external split structure, including an upper convex die main body 2a and an upper convex die outer sleeve 2b. The bottom surface of the upper convex die outer sleeve 2b is higher than the bottom surface of the upper convex die main body 2a. When the die is closed, the upper convex die main body 2a is inserted between the left half die 16 and the right half die 17, and the bottom surface of the upper convex die outer sleeve 2b contacts the top surfaces of the left half die 16 and the right half die 17. Of course, the upper convex die block 2 can also adopt an integral structure.

[0027] For convenient installation, both the upper punch 14 and the upper convex die main body 2a are provided with upper end heads, and are sequentially sleeved together from the inside to the outside through the upper end heads and then inserted into the upper convex die positioning seat 6. The upper convex die outer sleeve 2b presses on the step surface of the upper convex die main body 2a and is locked on the upper convex die positioning seat 6 by screws; the upper convex die positioning seat 6 is locked on the upper template 1 by screws, thereby realizing the installation of the upper convex die block 2 on the upper template 1.

[0028] The lower concave die block 4 is provided with a lower end head, which is inserted into the lower die positioning seat 5. The lower die positioning seat 5 is inserted into the lower template 3. The lower die block pressing ring 7 presses on the step surface of the lower concave die block 4 and is locked on the lower template 3 by screws, thereby realizing the installation of the lower concave die block 4 on the lower template 3.

[0029] Preferably, a lower cushion block 11 is arranged between the lower die positioning seat 5 and the lower template 3.

[0030] The knockout mechanism preferably adopts a split structure and is composed of a lower knockout block 9 and a knockout rod 10. The lower end of the lower knockout block 9 is provided with an anti - detachment protrusion 9a, the upper end of the knockout rod 10 abuts against the anti - detachment protrusion 9a, and the stroke range of the anti - detachment protrusion 9a is between the lower concave die block 4 and the lower cushion block 11. The stroke of the knockout mechanism is determined by the stroke range h of the anti - detachment protrusion 9a.

[0031] At least two sets of guiding mechanisms are arranged between the upper template 1 and the lower template 3, preferably four sets. Each set of guiding mechanisms is composed of a guide sleeve 12 and a guide post 13, and guides the up - and - down movement of the upper template 1 and the upper convex die block 2.

[0032] Preferably, the elastic locking device further includes a locking sleeve positioning plate 21 and a sliding sleeve 22. The locking sleeve positioning plate 21 is fixedly sleeved outside the locking sleeve 24. The locking sleeve positioning plate 21 is slidably mounted on the sliding rod 19 through the sliding sleeve 22 and is locked against detachment by a nut, thereby realizing the sliding mounting of the locking sleeve 24 on the sliding rod 19.

[0033] The front end of the opening and closing cylinder 18 is connected to the corresponding left and right half-molds 16 and 17 through a connecting block 23. The rear end of the opening and closing cylinder 18 is fixed on the column of the "L"-shaped cylinder mounting seat 15. The bottom plate of the cylinder mounting seat 15 is mounted on the lower template 3 through a cylinder positioning seat 8.

[0034] It is composed of an upper template 1, an upper convex module 2, a lower template 3, a lower concave module 4, a lower die positioning seat 5, an upper punch positioning seat 6, a lower module pressing ring 7, a cylinder positioning seat 8, a lower ejector block 9, a knockout rod 10, a lower spacer block 11, a guide sleeve 12, a guide post 13, an upper punch 14, a cylinder mounting seat 15, a left half-mold 16, a right half-mold 17, an opening and closing cylinder 18, a sliding rod 19, a compression spring 20, a pressing sleeve positioning plate 21, a sliding sleeve 22, a connecting block 23, and a locking sleeve 24.

[0035] The blank formed by this final forging die is as Figure 3 shown. Combining Figure 5As shown, by using the vertical forging method, through the processes of blanking, heating to forging temperature, material gathering, pre-forging, and final forging forming in sequence, a double-shaft gear blank with deep blind holes can be directly forged. The final forging process is as follows: The left and right opening and closing cylinders 18 move simultaneously towards the center position of the die, causing the left half-die 16 and the right half-die 17 to close the die, forming a complete lower die cavity with the fixed concave module 4. The blank after the pre-forging process is loaded into the lower die cavity. When the upper slide block of the press drives the upper template 1, upper convex module 2, upper punch 14, and elastic locking device of the final forging die to descend to the effective working stroke of the die, the inner conical surface of the locking sleeve 24 is in full contact with the outer conical surfaces of the left half-die 16 and the right half-die 17, locking the left and right half-dies so that they remain in the closed-die state after being stressed. The press slide block continues to descend. At this time, the compression spring 20 is further compressed, the locking sleeve 24 remains stationary, the locking force increases, the upper convex module 2 and the upper punch 14 continue to descend, the upper punch 14 begins to contact the blank and penetrates into the interior of the blank, filling the cavity at the lower gear position of the blank with material. The upper convex module 2 and the upper punch 14 continue to descend until the lower plane of the outer sleeve 2b of the upper convex die contacts the upper planes of the left half-die 16 and the right half-die 17, and the blank completes the final forging forming at this time. When the upper slide block of the press drives the upper template 1, upper convex module 2, upper punch 14, and elastic locking device of the final forging die to ascend to the effective working stroke of the die, the inner conical surface of the locking sleeve 24 begins to disengage from the outer conical surfaces of the left half-die 16 and the right half-die 17. The slide block continues to drive the upper template 1, upper convex module 2, upper punch 14, and elastic locking device to ascend and return to the initial position. The left and right opening and closing cylinders 18 move back in the left and right directions, separating the left half-die 16 and the right half-die 17. The ejector mechanism ascends to eject the blank, and the blank is taken out by manual clamping, completing a final forging work cycle.

Claims

1. A vertical finishing forging die dedicated to a deep blind hole double-shaft gear blank, comprising an upper convex die block (2) fixedly installed below an upper template (1), a lower concave die block (4) fixedly installed above a lower template (3), and a knockout mechanism vertically extending into the bottom of the cavity of the lower concave die block (4). An upper punch (14) is installed in the middle of the upper convex die block (2). Characterized in that: A left half die (16) and a right half die (17) are arranged above the lower concave die block (4). Opening and closing cylinders (18) are respectively equipped on the outer sides of the left and right half dies (16, 17) and can be opened and closed under the action of the opening and closing cylinders (18). The upper convex die block (2), the upper punch (14), the left half die (16), the right half die (17) and the lower concave die block (4) can jointly enclose a finishing forging die cavity. The finishing forging die cavity includes a deep blind hole, a large gear position cavity in the upper part, a small gear position cavity in the lower part and a cylindrical shape with a draft angle at the bottom. And the small gear position cavity in the lower part is opposite to the interface between the left and right half dies (16, 17) and the lower concave die block (4); An elastic locking device is also installed below the upper template (1). The elastic locking device includes a locking sleeve (24), a sliding rod (19) and a compression spring (20). The upper end of the sliding rod (19) is fixed on the upper template (1). The compression spring (20) and the locking sleeve (24) are slidably sleeved on the sliding rod (19) up and down; When the left and right half dies (16, 17) are closed and the upper template (1) drives the upper convex die block (2), the upper punch (14) and the elastic locking device to descend to the effective working stroke of the finishing forging die, the inner conical surface of the locking sleeve (24) can be in full contact with the outer conical surfaces of the left and right half dies (16, 17), so as to lock the left and right half dies (16, 17); When the upper template (1) continues to descend, the compression spring (20) is further compressed, while the locking sleeve (24) remains stationary, the locking force is increased, the upper convex die block (2) and the upper punch (14) continue to descend, the upper punch (14) penetrates into the finishing forging die cavity and the small gear position cavity at the lower part of the blank is filled with material. The upper convex die block (2) and the upper punch (14) continue to descend until the upper convex die block (2) contacts the left and right half dies (16, 17), and the blank is completed with finishing forging forming; The upper convex die block (2) adopts an internal and external split structure, including an upper convex die main body (2a) and an upper convex die outer sleeve (2b). And the bottom surface of the upper convex die outer sleeve (2b) is higher than the bottom surface of the upper convex die main body (2a). When the die is closed, the upper convex die main body (2a) is inserted between the left and right half dies (16, 17), and the bottom surface of the upper convex die outer sleeve (2b) contacts the top surfaces of the left and right half dies (16, 17); The upper punch (14) and the upper punch body (2a) both have upper ends, and are sleeved together from the inside to the outside through the upper ends and then inserted into the upper punch positioning seat (6). The upper punch outer sleeve (2b) presses on the stepped surface of the upper punch body (2a) and is locked on the upper punch positioning seat (6) by screws. The upper punch positioning seat (6) is locked on the upper template (1) by screws, so as to realize the installation of the upper punch module (2) on the upper template (1); the lower die cavity module (4) has a lower end, and the lower end is inserted into the lower die cavity positioning seat (5). The lower die cavity positioning seat (5) is inserted into the lower template (3). The lower module pressing ring (7) presses on the stepped surface of the lower die cavity module (4) and is locked on the lower template (3) by screws, so as to realize the installation of the lower die cavity module (4) on the lower template (3). The ejection mechanism adopts a split structure, including a lower ejector block (9) and an ejector rod (10). The lower end of the lower ejector block (9) is provided with an anti - detachment protrusion (9a), and the upper end of the ejector rod (10) abuts against the anti - detachment protrusion (9a). The stroke range of the anti - detachment protrusion (9a) is between the lower die cavity module (4) and the lower cushion block (11). The front end of the opening and closing cylinder (18) is connected to the corresponding left and right half - dies (16, 17) through a connecting block (23). The rear end of the opening and closing cylinder (18) is fixed on the column of the "L"-shaped cylinder mounting seat (15). The bottom plate of the cylinder mounting seat (15) is mounted on the lower template (3) through a cylinder positioning seat (8).

2. The vertical finishing forging die dedicated to the deep blind - hole double - shaft gear blank according to claim 1, characterized in that: A lower cushion block (11) is arranged between the lower die cavity positioning seat (5) and the lower template (3).

3. The vertical finishing forging die dedicated to the deep blind - hole double - shaft gear blank according to claim 1, characterized in that: At least two groups of guiding mechanisms are arranged between the upper template (1) and the lower template (3). Each group of guiding mechanisms is composed of a guide sleeve (12) and a guide post (13).

4. The vertical finishing forging die dedicated to the deep blind - hole double - shaft gear blank according to claim 1, characterized in that: The elastic locking device further includes a locking sleeve positioning plate (21) and a sliding sleeve (22). The locking sleeve positioning plate (21) is fixedly sleeved outside the locking sleeve (24). The locking sleeve positioning plate (21) is slidably mounted on the sliding rod (19) through the sliding sleeve (22) and is locked against detachment by a nut, so as to realize the sliding installation of the locking sleeve (24) on the sliding rod (19).

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