Screw machining forming die and machining method thereof

Abstract

The invention relates to the related technical field of metal forming, discloses a screw machining forming die and a machining method thereof, and aims to solve the problem that a screw subjected to cold heading punch forming is unsmooth in demolding. Die cavity cylinders are symmetrically arranged at the two ends of a die holder, so that the two die cavity cylinders can alternately perform cold heading punch forming on the screw; a middle rod connected with the interiors of the two die cavity cylinders is arranged in the middle of the die base, when the left die cavity cylinder conducts cold heading punch forming on a screw, the screw ejects the middle rod to enable the screw in the right die cavity cylinder to be discharged outwards, discharging is achieved, then the screw is placed in the right die cavity cylinder again, and in the punching process, the screw is placed in the right die cavity cylinder again. And the screw formed on the left side is pushed out of the left side mold cavity cylinder through the middle rod, and the effect of screw stamping demolding is achieved through circulation in this way.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal forming, in particular to a screw machining forming die and a machining method thereof. BACKGROUND

[0002] The screw machining forming die, as a core tool for manufacturing screws, is generally composed of a punch and a die. During the production process, it uses the cold heading process to place the metal blank in a high-pressure environment and extrude it into the die cavity. Since the die cavity is specially designed according to the shape of the screw head, the forming of the screw head can be completed through one stamping operation. According to such a production process, batch production of screws can be realized.

[0003] According to the search, the publication number CN219616631U proposes a bolt cold heading forming die, which includes: a spring drives corresponding circular plates and clamping rods into the mold cavity body, and the spring pushes the bolt blank in the mold cavity body cavity out, so that the user can quickly take out the cold heading processed bolt blank.

[0004] As can be seen, in the current cold heading stamping forming process of screws, a spring elastic force pushing structure is generally used. Specifically, when the screw blank is cold heading stamped, a certain pressure is applied to the spring. When the screw stamping forming is completed, the formed screw is pushed out of the die according to the spring elastic force. However, in actual application, the applicant found that since the die needs to be continuously stamped and formed, the spring needs to bear alternating loads frequently in this process. This frequent stress change causes the spring to have elastic fatigue after a long time of work. Once the spring has elastic fatigue, its elastic force will decrease significantly, which will cause the screw to be unable to be normally pushed out of the die. This not only affects the current screw taking out, but also has a chain reaction on the subsequent screw processing, reducing the stability and efficiency of the entire production process. SUMMARY

[0005] The present application proposes a screw machining forming die and a machining method thereof, which has the advantages of stamping demolding, to solve the problem of poor demolding of the screw after cold heading stamping forming in the background technology.

[0006] In order to achieve the above object, the technical scheme adopted by the present application is as follows: a screw processing forming die comprises a die seat, adjustment cylinders coaxially and fixedly installed at both ends of the die seat, die cavity cylinders fixedly connected to the ends of the adjustment cylinders, and screw blanks placed in the die cavity cylinders; a die head connected with a reciprocating stamping mechanism and coaxially arranged with the die cavity cylinders; a limiting seat installed on the inner side of the adjustment cylinder and used for limiting the input length of the screw blank; and a piston sleeved on the inner side of the die seat, a middle rod fixedly installed in the middle of the piston, and a material ejection head fixedly installed at both ends of the middle rod; when the die head stamps the screw blank in the die cavity cylinder, the screw blank is driven by the middle rod to realize the ejection and unloading of the formed screw in the other die cavity cylinder.

[0007] Further, a one-way oil inlet valve in communication with the inner cavity of the die seat is symmetrically installed on the outer side of the die seat, one end of the one-way oil inlet valve is connected with a lubricating oil tank, and the oil in the lubricating oil tank is unidirectionally input into the die seat.

[0008] Further, a detection arc block is movably installed at one end of the outer side of the die cavity cylinder, a counterweight is fixedly installed on the top of the detection arc block, an adjusting rod is fixedly installed on the side of the detection arc block, and a drain disc is movably installed at both ends of the die seat; when the detection arc block drives the adjusting rod to move radially along the drain disc, the drain disc realizes opening and closing control of the holes at the ends of the die seat.

[0009] Further, a driving groove and a drain opening are formed on the surface of the drain disc.

[0010] Further, drain holes are formed at both ends of the die seat.

[0011] Further, the limiting seat is movably sleeved on the inner side of the adjustment cylinder, a support frame is movably installed on the inner side of the adjustment cylinder, and a wedge-shaped transmission assembly is arranged between the limiting seat and the support frame.

[0012] Further, a connecting arm is fixedly installed on the top of the support frame below the adjusting rod, and an electromagnet assembly is fixedly installed on the outer side of the adjustment cylinder above the top end of the support frame.

[0013] Further, the wedge-shaped transmission assembly is composed of two wedge-shaped sliding blocks, and the side surface shape of the wedge-shaped sliding block is a right trapezoid.

[0014] Further, a position detection assembly and a pressure sensing assembly are symmetrically arranged on the top of the outer side of the die seat, the pressure sensing assembly is used for detecting the pressure in the inner cavity of the die seat, and the position detection assembly is used for detecting the position of the piston.

[0015] A processing method of a screw processing forming die, comprising the following steps: S1, the die seat is fixedly installed on the cold heading stamping machine by bolts, and the two die heads are connected with the reciprocating mechanism of the stamping machine to realize synchronous movement.

[0016] S2, the screw blank is placed in the right end of the mold cavity cylinder by mechanical clamping jaw, when the right mold head moves to the right side of the screw blank, the blank is pushed into the right mold cavity cylinder, the blank pushes the right material ejection head, the left material ejection head is driven by the intermediate rod to be ejected from the limiting seat, at this time, the left mold head moves to the left side, and the left screw unloading is not hindered.

[0017] S3, with the right screw blank continuously sent into the right mold cavity cylinder, the left formed screw is driven out of the mold cavity cylinder by the intermediate rod to realize unloading, and the right screw blank end reaches the right limiting seat, and the end of the right blank is formed again.

[0018] S4, the screw blank is supplemented to the left mold cavity cylinder by mechanical clamping jaw, when the mold head is driven by the reciprocating stamping mechanism to move to the right side, the left mold head stamps the screw blank in the left mold cavity cylinder, and the right formed screw is driven out to realize unloading by the intermediate rod.

[0019] The present application has the following beneficial effects: The screw machining forming die and the machining method thereof provided by the present application are characterized in that the two mold cavity cylinders are symmetrically arranged at the two ends of the mold base, so that the two mold cavity cylinders can alternately perform cold upsetting stamping forming operation on the screw.

[0020] The intermediate rod is arranged in the middle of the mold base and can connect the interiors of the two mold cavity cylinders, when the left mold cavity cylinder performs cold upsetting stamping forming on the screw, under the action of the stamping force, the screw enters the mold cavity and generates a certain thrust force.

[0021] After the stamping of the left mold cavity cylinder and the unloading of the right mold cavity cylinder are completed, the mechanical clamping jaw will put the screw to be processed into the right mold cavity cylinder again. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] Referring to the drawings, the present application can be more clearly understood in conjunction with the following detailed description, in which: Figure 1 It is a schematic diagram of the overall external three-dimensional structure of the present application; Figure 2It is the whole internal plane section structure schematic view of the application; Figure 3 It is the whole internal stereoscopic section structure schematic view of the application; Figure 4 It is the internal position and stereoscopic structure schematic view of each component of the cavity cylinder of the application; Figure 5 It is the internal position and stereoscopic structure schematic view of each component of the die seat of the application; Figure 6 It is the screw processing working state schematic view of the application.

[0024] In the figure: 1, die head; 2, die seat; 200, oil drain hole; 3, adjusting cylinder; 4, cavity cylinder; 5, electromagnet assembly; 6, adjusting rod; 7, connecting arm; 8, counterweight; 9, in-place detection assembly; 10, pressure sensing assembly; 11, detection arc block; 12, material ejection punch; 13, limiting seat; 14, wedge-shaped transmission assembly; 141, support frame; 15, piston; 16, one-way oil inlet valve; 17, oil drain disc; 171, driving groove; 172, oil drain port; 18, intermediate rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the application.

[0026] Embodiment one, please refer to Figure 1 and Figure 2 It can be seen that, compared with the traditional screw cold heading forming die, the die seat 2 in the application has two adjusting cylinders 3 fastened and installed by bolts at both ends, and the two adjusting cylinders 3 are fixedly connected with cavity cylinders 4 at the ends. The number of the cavity cylinders 4 is two, and they are correspondingly arranged at both ends of the die seat 2. It can be seen that the screw cold heading forming die in the application has two working positions. Each working position is configured with a corresponding die head 1. The die head 1 is generally connected with a reciprocating stamping mechanism, and the two die heads 1 move synchronously. In detail, combined with Figure 1 and Figure 2 When the left die head 1 cold heading stamping processes the screw in the cavity cylinder 4, the right die head 1 is relatively far away from the right cavity cylinder 4, and the right cavity cylinder 4 is in the screw discharge forming state and the screw blank feeding state.

[0027] According to Figure 2 and Figure 3As shown, a limiting seat 13 is installed inside the adjusting cylinder 3, and a through stepped hole is axially opened in the middle of the limiting seat 13. Correspondingly, a piston 15 is sealed and movable inside the mold base 2, and an intermediate rod 18 coaxially arranged with the two limiting seats 13 is fixedly installed in the middle of the piston 15. Material ejection heads 12 are fixedly installed at both ends of the intermediate rod 18. After the material ejection heads 12 approach the stepped groove at the end of the limiting seat 13, they can fill the limiting seat 13 and make the end face of the limiting seat 13 near the screw relatively flat. The advantage of this design is that, combined with… Figure 2 As can be seen, when the left ejector pin 12 comes into contact with the limiting seat 13, the end of the left limiting seat 13 becomes relatively flat. When the left screw is inserted into the mold cavity 4, the end of the screw eventually abuts against the end of the limiting seat 13 and the ejector pin 12, thus limiting the insertion of the screw by the limiting seat 13. Subsequently, when the left die 1 presses the screw, the limiting seat 13 restricts the screw, forcing the die 1 to cold-forge the left end of the screw to achieve the desired shape. In this application, an arc-shaped head is used as an example; other different head shapes can be achieved by changing the shape of the die 1. Furthermore, when the left ejector pin 12 approaches the limiting seat 13, the right ejector pin 12, driven by the intermediate rod 18, will move relatively away from the right limiting seat 13.

[0028] Specifically, in practical applications, based on Figure 2 and Figure 6 As shown, the die holder 2 is fastened to the cold heading press with bolts, and the two die heads 1 are connected to the reciprocating end of the press to achieve synchronous movement of the two die heads 1, as shown. Figure 6 As shown by the dotted lines, the two mold heads 1 are connected by a rectangular dotted frame. When one mold head 1 moves left and right, the other mold head 1 will move synchronously to the left, right and down.

[0029] Using mechanical grippers (such as robotic arms), the screw blank is placed at the right end of the mold cavity 4. When the right mold head 1 moves toward the right screw blank, the mold head 1 will first come into contact with the screw blank and push it into the mold cavity 4. The right blank will push the right ejector head 12, and through the transmission of the intermediate rod 18, the left ejector head 12 will be ejected from the limit seat 13. At this time, the left mold head 1 will not prevent the left screw from being unloaded to the left because it moves to the left.

[0030] As the screw blank on the right side is continuously fed into the cavity 4 on the right side, the screw formed on the left side is pushed out of the cavity 4 by the transmission of the intermediate rod 18, thus unloading the finished screw on the left side. Finally, the end of the screw blank on the right side abuts against the right limit seat 13. As the right die head 1 applies pressure to the blank again, the end of the blank on the right side is formed.

[0031] Then, the mechanical gripper fills the left mold cavity 4 with screw blanks. When the reciprocating stamping mechanism drives the die head 1 to move to the right, the left die head 1 stamps the screw blanks in the left mold cavity 4. After being driven by the intermediate rod 18, the right-side formed screw will be pushed outward, thereby realizing the unloading of the right-side formed screw.

[0032] In summary, this embodiment demonstrates that in its application, the two die heads 1 reciprocate cold-forging the mold cavities 4 at both ends of the die base 2. During the forging process, the intermediate rod 18 drives the screw to be ejected from the mold cavity 4 after forming, facilitating unloading. Compared to the traditional spring compression and force storage unloading method, this application utilizes the thrust generated during screw cold forging to directly eject the formed screw, eliminating the need for a spring and preventing the problem of unloading failure due to spring fatigue over a long period.

[0033] Example 2 is a further improvement on Example 1. Please refer to Example 1. Figure 2 , Figure 3 and Figure 5 It can be seen that the inner diameter of the mold base 2 is relatively larger than the inner diameter of the mold cavity 4. Furthermore, one-way oil inlet valves 16 that communicate with the inner cavity of the mold base 2 are symmetrically installed on the outer side of the mold base 2. One end of the one-way oil inlet valve 16 is connected to the lubricating oil tank, so as to realize the one-way input of oil in the lubricating oil tank into the mold base 2.

[0034] In practical applications, based on Figure 2 As shown, when the die head 1 on the right side punches the screw on the right side, the blank pushes the piston 15 to the left through the intermediate rod 18. At this time, the right chamber of the piston 15 draws in lubricating oil through the right one-way oil inlet valve 16. The ejector head 12 on the left side of the piston 15 first pushes the left forming screw to the left, using the intermediate rod 18 to force the forming screw to disengage from the left mold cavity 4, avoiding the problem of jamming between the screw end and the left mold cavity 4. After the ejector head 12 moves away from the limit seat 13, as there is lubricating oil in the left chamber of the piston 15, the lubricating oil passes through the middle of the limit seat 13 and enters the inner cavity of the left mold cavity 4, using the medium pressure to push the left forming screw to move further. Finally, the medium impacts the screw, forcing it to disengage from the mold cavity 4, so that the ejector head 12 does not need to extend completely out of the mold cavity 4.

[0035] Afterwards, since there is a gap between the left ejector pin 12 and the end of the mold cavity 4, this gap can be referenced. Figure 2In the right-hand region shown, after the left-side screw blank is fed in using mechanical grippers, its positioning and placement are ensured because the blank is already partially inserted into the die cavity 4. Then, when the left-side die head 1 stamps the left-side blank, the blank pushes the intermediate rod 18, causing the right-side forming screw to be ejected. The lubricating oil on the right side of the piston 15 further ejects the right-side forming screw. Afterward, the blank is fed in again for stamping, and this cycle repeats, achieving continuous cold heading forming of the screw.

[0036] In summary, in the application of this second embodiment, during the unloading process of the formed screw, the intermediate rod 18 first pushes the screw to initially separate it from the mold cavity 4. Then, hydraulic oil is input into the inner cavity of the mold cavity 4, causing the lubricating oil inside the mold cavity 4 to further push out the formed screw for unloading. The lubricating oil flowing out of the mold cavity 4 facilitates the subsequent feeding of screw blanks and subsequent cold heading and stamping of screws. Finally, since the ejector head 12 is not completely pushed out of the mold cavity 4, the blank does not need to be continuously held by the mechanical grippers after being fed into the inner cavity at the end of the mold cavity 4, ensuring that the screw blank only needs to be directly inserted into the inner cavity at the end of the mold cavity 4 during feeding.

[0037] As a supplement to Embodiment 2, to ensure that the lubricating oil in the mold base 2 has sufficient pressure to push the forming screw out of the mold cavity 4 when it is discharged from the mold cavity 4, and to allow the lubricating oil in the mold base 2 to quickly release pressure after the screw is discharged from the mold cavity 4, thus preventing the increased pressure of the lubricating oil inside the mold base 2 from affecting the stamping of the blank in the other mold cavity 4, combined with... Figure 2 , Figure 3 and Figure 5 It can be seen that a detection arc block 11 is movably installed at one end of the outer side of the mold cavity 4, and a counterweight 8 is fixedly installed on the top of the detection arc block 11. The counterweight 8 can be adjusted according to actual needs. The detection arc block 11 is arc-shaped and has an angled bottom. When the screw is inserted into the mold cavity 4, the screw will push the detection arc block 11 upward, and the detection arc block 11 will drive the counterweight 8 upward synchronously, forcing the detection arc block 11 to abut against the outer side of the screw.

[0038] An adjusting rod 6 is fixedly installed on the side of the detection arc block 11. The adjusting rod 6 can move up and down synchronously with the detection arc block 11. Correspondingly, combined with Figure 5It can be seen that oil drain plates 17 are movably mounted at both ends of the mold base 2, and the oil drain plates 17 can only rotate at the ends of the mold base 2. A drive groove 171 is formed on the surface of the oil drain plate 17. The drive groove 171 is an inclined groove. When the detection arc block 11 drives the adjusting rod 6 to move radially along the oil drain plate 17, the adjusting rod 6 pushes the drive groove 171, forcing it to rotate the oil drain plate 17. Simultaneously, an oil drain port 172 is formed on the surface of the oil drain plate 17, and oil drain holes 200 are formed at both ends of the mold base 2 to connect the inner cavity of the mold base 2 with the outside. Combined with... Figure 5 As can be seen, one oil drain port 172 corresponds to the area between two oil drain holes 200 at the end of the mold base 2. Under normal conditions, the screw pushes the detection arc block 11 upward, so that the adjusting rod 6 is in the middle of the drive groove 171. At this time, the oil drain port 172 is located between the two oil drain holes 200, and the oil drain plate 17 completely blocks the oil drain holes 200 by offsetting them. When the detection arc block 11 extends into the mold cavity 4, it will synchronously drive the adjusting rod 6 to move towards the middle of the oil drain plate 17, forcing the adjusting rod 6 to push the oil drain plate 17 to rotate through the drive groove 171, and connecting the oil drain port 172 and the oil drain hole 200.

[0039] Specifically, such as Figure 2 As shown, when the right die head 1 pushes the right screw blank, the intermediate rod 18 pushes the left ejector head 12 to the left, and the ejector head 12 abuts against the forming screw in the left mold cavity 4. When the piston 15 squeezes the left hydraulic oil, the detection arc block 11 is blocked by the screw, causing it to move the adjusting rod 6 to the middle of the drive groove 171. At this time, the oil drain plate 17 blocks the oil drain hole 200. As the piston 15 squeezes the left lubricating oil, the left lubricating oil quickly pushes the left forming screw outward, ensuring that the left screw has sufficient ejection strength.

[0040] After the screw on the left side is fully pushed out of the mold cavity 4, the counterweight 8, under the action of gravity, will press the detection arc block 11 into the mold cavity 4. The detection arc block 11 drives the adjusting rod 6 downward, and the adjusting rod 6, through the drive groove 171, causes the oil drain plate 17 to connect with the oil drain port 172 and the oil drain hole 200. After that, the lubricating oil in the left cavity of the mold base 2 is quickly discharged outward from the mold cavity 4 and the oil drain hole 200. This ensures that when the right mold base 2 pushes the blank, the feeding of the blank on the right side will not be obstructed due to excessive lubricating oil pressure in the left cavity of the piston 15.

[0041] Furthermore, when a screw blank needs to be fed into the left side, the fed blank uses the inclined plane to push the detection arc block 11 upward until the blank is fully inserted into the end of the mold cavity 4. On one hand, the blank causes the detection arc block 11 to drive the adjusting rod 6 upward to reset, so that the adjusting rod 6 forces the oil drain plate 17 to reset through the drive groove 171, ultimately sealing the oil drain hole 200; on the other hand, the detection arc block 11 is pressed against the outer side of the blank on the left side by the gravity of the counterweight 8, ensuring that the screw blank on the left side has sufficient clamping strength, and preventing the screw blank from accidentally falling out of the mold cavity 4 due to external factors (such as machine tool vibration) after being fed into the mold cavity 4.

[0042] Example 3 is a further improvement on Example 2. Please refer to Example 2. Figures 2-4 It can be seen that the limiting seat 13 is movably fitted inside the adjusting cylinder 3, and the support frame 141 is movably installed inside the adjusting cylinder 3. A wedge-shaped transmission assembly 14 is provided between the limiting seat 13 and the support frame 141. The wedge-shaped transmission assembly 14 consists of two wedge-shaped sliders, which are right-angled trapezoids. One of the wedge-shaped sliders is fixedly connected to the limiting seat 13 with bolts, and the other is fixedly installed on the support frame 141. Under normal conditions, when the support frame 141 descends to the bottom, the top surfaces of the wedge-shaped sliders on the limiting seat 13 and the support frame 141 are pressed together, forcing the limiting seat 13 to abut against the inner side of the end of the mold cavity cylinder 4. A connecting arm 7 is fixedly installed on the top of the support frame 141, located below the adjusting rod 6. An electromagnet assembly 5 is fixedly installed on the outside of the adjusting cylinder 3, located above the top of the support frame 141. When the electromagnet assembly 5 is turned on and generates magnetism, it attracts the support frame 141, causing the wedge-shaped slider to move upwards. Simultaneously, the connecting arm 7 pushes the adjusting rod 6 upwards. The upward-moving adjusting rod 6 uses the drive groove 171 to rotate the oil drain plate 17, reconnecting the oil drain port 172 and the oil drain hole 200. Furthermore, if the electromagnet assembly 5 is de-energized, the counterweight 8, under the influence of gravity, causes the detection arc block 11 to extend into the mold cavity 4. Simultaneously, the adjusting rod 6 descends to press down on the connecting arm 7, which pushes the support frame 141 downwards to reset. Figures 1-3 It can be seen that the outer top of the mold base 2 is symmetrically arranged with the positioning detection component 9 and the pressure sensing component 10. The pressure sensing component 10 can detect the pressure in the inner cavity of the mold base 2 and the area around the piston 15. The positioning detection component 9 is used to detect the position of the piston 15.

[0043] In practical applications, this third embodiment, for example... Figure 2 For example, when the two die heads 1 move to the left, the left die head 1 moves away from the forming screw, and the right die head 1 pushes the screw blank placed at the end of the mold cavity 4.

[0044] During this process, if the size of the blank placed on the right side is the same as the inner diameter of the mold cavity 4, the blank pushes the detection arc block 11 on the right side upward, and the detection arc block 11 on the right side drives the adjusting rod 6 upward, ultimately causing the oil drain plate 17 at the right end of the mold base 2 to seal the oil drain hole 200. Afterward, as the blank pushes the intermediate rod 18 to the left, the left ejector head 12 pushes the left forming screw to unload the blank, which is consistent with the content described in the above embodiment 2. When the intermediate rod 18 drives the piston 15 to the left, the piston 15 will first move away from the right-side positioning detection component 9. During this process, the piston 15 moves to the left, causing the pressure in the inner cavity of the right side of the mold base 2 to decrease, and this signal is input to the control system (such as a programmable controller). On the one hand, the pressure sensing component 10 detects that the pressure in the inner cavity of the mold base 2 is less than the external pressure. On the other hand, the one-way oil inlet valve 16 replenishes lubricating oil into the inner cavity of the right side of the mold base 2. As the intermediate rod 18 pushes the piston 15 to the left, the piston 15 eventually moves to the left-side positioning detection component 9. The left-side positioning detection component 9 then sends a positioning signal to the control system. Combined with the previously mentioned signal that the pressure sensor component 10 on the right side of the mold base 2 has lower pressure than the external pressure, the electromagnet component 5 on the right side will not move. The wedge-shaped transmission component 14 on the right side is positioned between the support frame 141 and the limiting seat 13, allowing the limiting seat 13 on the right side to abut against the mold cavity 4. Finally, as the end of the blank on the right side abuts against the limiting seat 13, preventing further input into the mold cavity 4, the end of the blank is cold-forged using the die head 1 on the right side, thus completing the stamping of the screw.

[0045] If the diameter of the blank on the right side is larger than the inner diameter of the mold cavity 4 when it is put into the mold cavity 4, the screw blank cannot be properly fed into the mold cavity 4.

[0046] If the diameter of the right-side screw blank is too small when it is placed into the mold cavity 4, the blank diameter will be insufficient to push the detection arc block 11 upward, or the blank will not be able to push the detection arc block 11 upward enough to cause the adjusting rod 6 to drive the right-side oil drain plate 17 to block the oil drain hole 200. Afterward, when the right-side blank is pushed into the mold cavity 4 by the die head 1, the intermediate rod 18 drives the piston 15 to move to the left. At this time, the right-side inner cavity of the mold base 2 is rapidly replenished with airflow through the mold cavity 4 and the oil drain hole 200, causing the pressure detected by the right-side pressure sensing component 10 to always be equal to that of the outside. Therefore, no signal is input to the control system. When the piston 15 moves to the left-side positioning detection component 9, since the right-side pressure sensing component 10 does not input a signal to the control system, the control system will turn on the right-side electromagnet component 5 and generate magnetism. When the right-side electromagnet component 5 attracts the support frame 141, the support frame 141 pulls the wedge-shaped transmission component 14 upward, thereby releasing the limit on the limit seat 13. When the support frame 141 moves upward and drives the connecting arm 7 upward, the connecting arm 7 pushes the adjusting rod 6 upward synchronously. The adjusting rod 6 drives the detection arc block 11 upward and away from the mold cavity 4. The adjusting rod 6 uses the drive groove 171 to make the oil drain plate 17 rotate, realizing the connection between the oil drain port 172 and the oil drain hole 200. Subsequently, when the right blank reaches the limit seat 13, since the limit seat 13 is released, when the right die head 1 squeezes the blank, it will further push the blank to the left. The right limit seat 13 moves closer to the adjusting cylinder 3, thereby avoiding the blank that is too small from being punched by the die head 1. The reason is that when the blank is too small, its deformation is not at the end when it is punched, but is also prone to deformation in the middle and other parts. Once it gets stuck inside the mold cavity 4, it will not only facilitate the subsequent unloading, but also easily damage the mold cavity 4. Therefore, when the equipment detects that the blank size is too small, it will not perform the stamping operation. Finally, when the blank is fed into the left mold cavity 4 and pushes the intermediate rod 18 and piston 15 to the right, the right electromagnet assembly 5 remains continuously connected, causing the oil drain hole 200 to connect to the outside during the movement of piston 15 to the right, reducing its movement resistance. The connecting arm 7 and adjusting rod 6 push the detection arc block 11 upwards, preventing it from contacting the unpressed blank on the right. Since the blank size on the right is smaller than the inner diameter of the mold cavity 4, when the ejector head 12 on the right is pushed by the intermediate rod 18, it pushes the blank on the right outwards. During this movement, because the smaller blank on the right is not obstructed, the rapid push of the ejector head 12 on the screw blank causes the unobstructed screw to slide out of the mold cavity 4 due to the inertia of the ejector head 12. In practical applications, depending on the usage requirements, a high-pressure air blowing assembly can also be installed at the end of the mold cavity 4 to further ensure the unloading of the unpressed blank and prevent the blank from improperly detaching from the mold cavity 4.

[0047] Finally, when the right-moving piston 15 contacts the right-side positioning detection component 9, the right-side electromagnet component 5 disengages. Then, under the weight of the counterweight 8, the support frame 141 and the oil drain plate 17 reset. The working process of the left-side mold cavity cylinder 4 is the same as that of the right side, and will not be repeated here.

Claims

1. A screw forming mold, characterized in that, include: The mold base (2) has an adjusting cylinder (3) fastened coaxially at both ends. The ends of the adjusting cylinder (3) are all fixedly connected to the mold cavity cylinder (4). The mold cavity cylinder (4) contains a screw blank. The die head (1) is connected to the reciprocating stamping mechanism and is arranged coaxially with the die cavity (4); The limiting seat (13) is installed inside the adjusting cylinder (3) and is used to limit the input length of the screw blank; The piston (15) is fitted inside the mold base (2), with a middle rod (18) fixedly installed in the middle, and ejector heads (12) fixedly installed at both ends of the middle rod (18). When the die head (1) presses the screw blank in the die cavity (4), the screw blank is driven by the intermediate rod (18) to realize the ejection and unloading of the formed screw in the other die cavity (4).

2. The screw forming mold according to claim 1, characterized in that, A one-way oil inlet valve (16) is symmetrically installed on the outer side of the mold base (2) and communicates with the inner cavity of the mold base (2). One end of the one-way oil inlet valve (16) is connected to the lubricating oil tank, so that the oil in the lubricating oil tank can be input into the mold base (2) in one direction.

3. The screw forming mold according to claim 2, characterized in that, A detection arc block (11) is movably installed at one end of the outer side of the mold cavity (4), and a counterweight (8) is fixedly installed on the top of the detection arc block (11). An adjusting rod (6) is fixedly installed on the side of the detection arc block (11). Oil drain plates (17) are movably installed at both ends of the mold base (2). When the detection arc block (11) drives the adjusting rod (6) to move radially along the oil drain plate (17), the oil drain plate (17) controls the opening and closing of the opening at the end of the mold base (2).

4. The screw forming mold according to claim 3, characterized in that, The surface of the oil drain plate (17) is provided with a drive groove (171) and an oil drain port (172).

5. The screw forming mold according to claim 4, characterized in that, Oil drain holes (200) are provided at both ends of the mold base (2).

6. The screw forming mold according to claim 3, characterized in that, The limiting seat (13) is movably mounted on the inner side of the adjusting cylinder (3), and the support frame (141) is movably installed on the inner side of the adjusting cylinder (3). A wedge-shaped transmission assembly (14) is provided between the limiting seat (13) and the support frame (141).

7. The screw forming mold according to claim 6, characterized in that, A connecting arm (7) located below the adjusting rod (6) is fixedly installed on the top of the support frame (141), and an electromagnet assembly (5) located above the top of the support frame (141) is fixedly installed on the outside of the adjusting cylinder (3).

8. The screw forming mold according to claim 6, characterized in that, The wedge-shaped transmission assembly (14) consists of two wedge-shaped sliders, the side of which is a right trapezoid.

9. The screw forming mold according to claim 7, characterized in that, A positioning detection component (9) and a pressure sensing component (10) are symmetrically arranged on the top outer side of the mold base (2). The pressure sensing component (10) is used to detect the pressure inside the mold base (2), and the positioning detection component (9) is used to detect the position of the piston (15).

10. A method for processing a screw forming mold, using the screw forming mold as described in claim 1, characterized in that, Includes the following steps: S1. Secure the die base (2) to the cold heading press with bolts, so that the two die heads (1) are connected to the reciprocating motion mechanism of the press to achieve synchronous motion; S2. The screw blank is placed at the right end of the mold cavity (4) using mechanical grippers. When the right mold head (1) moves towards the right screw blank, it pushes the blank into the right mold cavity (4). The blank pushes the right ejector head (12), and through the transmission of the intermediate rod (18), the left ejector head (12) is ejected from the limit seat (13). At this time, the left mold head (1) moves to the left without hindering the unloading of the left screw. S3. As the right screw blank is continuously fed into the right mold cavity (4), the screw formed on the left side is ejected from the mold cavity (4) through the transmission of the intermediate rod (18) to achieve unloading. The end of the right screw blank touches the right limit seat (13) and pressure is applied to the right blank again to form the end. S4. The mechanical gripper is used to feed the screw blank into the left mold cavity (4). When the reciprocating stamping mechanism drives the die head (1) to move to the right, the left die head (1) stamps the screw blank in the left mold cavity (4). The right-side formed screw is pushed out by the transmission of the intermediate rod (18) to achieve unloading.

Images