Lower die locking structure of water swelling mold

Abstract

The utility model discloses a lower mould locking structure of water swelling mould, and the lower mould assembly of water swelling mould includes lower mould and lower mould base, is equipped with the lower mould swelling core of elastic telescopic in the vertical slide of lower mould base, and the lower mould swelling core upper section stretches into the lower mould cavity and is equipped with the lower mould spring clamp, and the bottom of lower mould base is equipped with locking structure, and the locking structure includes locking cylinder, and the cylinder body of locking cylinder is installed with lower mould base, and the piston rod upper end of locking cylinder passes through lower mould base and lower mould swelling core in proper order upwards, and the piston rod is hollow rod structure of being equipped with water inlet channel, and the stretch -out section that the piston rod stretches out lower mould swelling core is opened on to the water outlet hole that penetrates along the radial upwards, and the stretch -out section of piston rod is connected with lower mould spring clamp, and through the piston rod vertical telescopic of locking cylinder, thereby drives lower mould spring clamp to move up and down, realizes the control to the state whether the lower mould spring clamp opens up or not. The utility model has the advantages of realizing the locking of work piece in lower mould, and guaranteeing that work piece is always on the lower mould after the die is opened.

Description

Technical Field

[0001] This utility model relates to tubular product forming equipment, and more particularly to a lower mold locking structure for a water expansion mold. Background Technology

[0002] Manufacturing tubular metal workpieces for metal cups and jugs requires the use of a water-expansion molding die. During water expansion molding, the upper and lower ends of the workpiece are clamped in the upper and lower mold bases, respectively. Water is then injected into the cavity via a pressure cylinder, causing the tubular metal workpiece to expand and solidify. After water expansion molding is complete, the upper and lower molds open, and a robotic arm grips and unloads the workpiece from the lower mold. However, existing equipment lacks a locking structure within the lower mold. During the upward movement of the upper mold when the mold opens, the workpiece is easily carried upwards along with it, preventing the robotic arm from accurately gripping and unloading the workpiece. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lower mold locking structure for a water expansion mold, so as to lock the workpiece in the lower mold and ensure that the workpiece is always on the lower mold after the mold is opened.

[0004] This utility model is achieved through the following technical solution: A locking structure for the lower mold of a water-expanding mold is disclosed. The water-expanding mold includes a lower mold assembly, which comprises a lower mold and a lower mold base connected vertically. A lower mold expansion core capable of vertical elastic expansion is provided in the vertical slide of the lower mold base. The upper section of the lower mold expansion core extends into the lower mold cavity of the lower mold and is fitted with a lower mold spring clip. A locking structure is provided at the bottom of the lower mold base. The locking structure includes a locking cylinder. The cylinder body of the locking cylinder is installed with the lower mold base. The upper end of the piston rod of the locking cylinder passes upward through the lower mold base and the lower mold expansion core in sequence. The section of the piston rod extending upward out of the lower mold expansion core is called the extension section. The piston rod is a hollow rod structure with an internal water inlet channel. A radially penetrating water outlet hole is opened on the extension section of the piston rod. The extension section of the piston rod is connected to the lower mold spring clip. By vertically expanding and contracting the piston rod of the locking cylinder, the lower mold spring clip is driven to move up and down, thereby controlling whether the lower mold spring clip is expanded or not.

[0005] As a preferred embodiment of the lower mold locking structure of the aforementioned water expansion mold, the section of the water inlet channel of the piston rod near the top is a threaded channel. The connection between the lower mold spring clip and the piston rod is achieved by passing a screw through the lower mold spring clip and screwing it into the threaded channel at the top of the piston rod.

[0006] As a preferred embodiment of the lower mold locking structure of the aforementioned water expansion mold, a lower mold guide core is provided above the lower mold spring clip. The lower mold guide core has a countersunk hole. After the screw passes through the countersunk hole and the through hole of the lower mold spring clip in sequence, it is screwed into the threaded channel of the piston rod to realize the connection between the lower mold guide core, the lower mold spring clip and the piston rod.

[0007] As a preferred embodiment of the lower mold locking structure of the aforementioned water-expanding mold, the cylinder body of the locking cylinder includes a cylinder body main body, with a vertically penetrating channel opened in the center of the cylinder body main body. The upper and lower ends of the channel are sealed by upper and lower cover plates that are detachably connected to the cylinder body main body. The channel, upper cover plate, and lower cover plate of the cylinder body main body together form the air cavity of the cylinder body. A piston ring is provided on the piston rod at the section located in the air cavity. The piston ring slides in conjunction with the air cavity. Vibration damping pads are movably fitted on the piston rod on the upper and lower sides of the piston ring, respectively. Both vibration damping pads are located in the air cavity.

[0008] As a preferred embodiment of the lower mold locking structure of the above-mentioned water expansion mold, the upper cover plate and the cylinder body are embedded in each other, the top surface of the upper cover plate is flush with the top surface of the cylinder body, the top center of the upper cover plate is provided with a recessed first positioning groove, the bottom center of the lower mold base is provided with a protruding first positioning protrusion, and the first positioning groove and the first positioning protrusion are fitted together.

[0009] As a preferred embodiment of the lower mold locking structure of the aforementioned water expansion mold, the lower cover plate is embedded in the cylinder body, the bottom surface of the lower cover plate is flush with the bottom surface of the cylinder body, and a second positioning protrusion is provided at the center of the bottom surface of the lower cover plate, the second positioning protrusion having the same shape as the first positioning protrusion.

[0010] As a preferred embodiment of the lower mold locking structure of the aforementioned water expansion mold, a water sealing ring is respectively embedded in the center of the top end of the upper cover plate and the center of the bottom end of the lower cover plate, and the inner wall of the water sealing ring is sealed and fitted with the outer wall of the piston rod.

[0011] As a preferred embodiment of the lower mold locking structure of the aforementioned water-expanding mold, the lower section of the lower mold spring clip is a cylindrical elastic section. The upper end of the elastic section has multiple water passage holes along the circumferential direction, and the upper end of the elastic section has multiple slits along the circumferential direction. The upper ends of the multiple slits are connected to the multiple water passage holes one by one. The elastic section is divided into several elastic pieces by the multiple slits. A section of water-expanding conical surface is provided on the outer wall of the lower mold expansion core. When the lower mold spring clip moves downward relative to the lower mold expansion core, the multiple elastic pieces of the elastic section of the lower mold spring clip are expanded radially outward through the water-expanding conical surface of the lower mold expansion core. In the expanded state, a lower clamping gap is formed between the outer wall of the elastic section of the lower mold spring clip and the inner wall of the vertical slide of the lower mold base for clamping the lower end of the workpiece.

[0012] This invention has the following advantages over the prior art: This utility model provides a lower mold locking structure for a water-expanding mold. By adding a locking structure between the lower mold base of the lower mold assembly and the base plate of the water-expanding machine, the locking structure employs a locking cylinder. The piston rod of the locking cylinder extends and retracts vertically, thereby driving the lower mold spring clamp of the lower mold assembly to move up and down. This controls whether the lower mold spring clamp is open or closed, allowing for flexible control over whether the lower mold spring clamp clamps the lower end of the workpiece. This ensures that the lower end of the workpiece is always clamped by the open lower mold spring clamp during mold opening, preventing the workpiece from being moved upwards by the upper mold. It also ensures that the workpiece remains on the lower mold after mold opening, thus guaranteeing accurate gripping of the workpiece by the robotic arm for unloading. Furthermore, the piston rod of the locking cylinder is designed as a hollow structure, allowing the internal channel of the piston rod to serve as a water inlet channel for water expansion molding, eliminating the need for a separate component to achieve the water inlet function. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the locking structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the locking structure and the installation of the lower mold assembly of this utility model.

[0015] Figure 3 This is a longitudinal sectional view of the lower mold spring clip of this utility model.

[0016] Figure 4 This is a cross-sectional view of the lower mold spring clip of this utility model.

[0017] Figure 5 This is a schematic diagram of the upper mold assembly and lower mold assembly in the mold-closed state of this utility model.

[0018] Numbered in the diagram: 1 Lower mold; 2 Lower mold expansion core; 3 Lower mold base plate; 4 Lower mold base; 5 Limiting protrusion ring; 6 Limiting groove; 7 Lower mold ejection spring; 8 Lower mold cavity; 9 Lower mold spring clip; 10 Lower mold guide core; 11 Cylinder; 12 Piston rod; 13 Water inlet channel; 14 Water outlet hole; 15 Threaded channel; 16 Screw; 17 Elastic section; 18 Water passage hole; 19 Gap; 20 Elastic plate; 21 Water-expanding cone surface; 22 Lower clamping 23. Clearance; 24. Cylinder body; 25. Upper cover plate; 26. Lower cover plate; 27. Air chamber; 28. Piston ring; 29. ​​Vibration damping pad; 20. First positioning groove; 31. First positioning protrusion; 32. Second positioning protrusion; 33. Water sealing ring; 34. Sealing ring; 35. Upper mold base plate; 36. Upper mold base; 37. Upper mold expansion core; 38. Upper mold spring clip; 39. Upper mold guide core; 40. Upper mold ejection spring; 41. Upper clamping clearance. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0020] See Figures 1 to 5 This embodiment discloses a lower mold locking structure for a water-expanding mold. The water-expanding mold includes an upper mold assembly and a lower mold assembly. The lower mold assembly includes a lower mold 1 and a lower mold base connected vertically. The lower mold base has a lower mold expansion core 2 that can elastically expand and contract vertically within its vertical slide. The lower mold base consists of a lower mold base plate 3 and a lower mold base 4 mounted on the lower mold base plate 3. The lower mold base plate 3 seals the bottom of the vertical slide. The bottom of the lower mold expansion core 2 has a limiting protrusion ring 5 that protrudes radially outward. The lower end of the vertical slide of the lower mold base 4 has a limiting groove 6 for the limiting protrusion ring 5 to slide vertically. The top wall of the limiting groove 6 abuts against the limiting protrusion ring 5, thereby limiting the upper limit position of the upward sliding of the lower mold expansion core 2. A lower die ejection spring 7 is provided at the center of the bottom of the vertical slide. The lower die ejection spring 7 provides elastic support for the lower die expansion core 2. Under the natural state, the lower die expansion core 2 is in the upper limit position under the elastic force of the lower die ejection spring 7. The upper section of the lower die expansion core 2 extends into the lower die cavity 8 of the lower die 1 and is fitted with a lower die spring clip 9. A lower die guide core 10 is provided above the lower die spring clip 9.

[0021] The bottom of the lower mold base is provided with a locking structure, which includes a locking cylinder. The cylinder body 11 of the locking cylinder is installed with the lower mold base plate 3 of the lower mold base. The upper end of the piston rod 12 of the locking cylinder passes through the lower mold base and the lower mold expansion core 2 in sequence. The part of the piston rod 12 that extends upward from the lower mold expansion core 2 is the extension section. The piston rod 12 is a hollow rod structure with an internal water inlet channel 13. A radially penetrating water outlet hole 14 is opened on the extension section of the piston rod 12. The extension section of the piston rod 12 is connected to the lower mold spring clip 9. Specifically, the part of the water inlet channel 13 of the piston rod 12 near the top is a threaded channel 15. A countersunk hole is opened on the lower mold guide core 10. After the screw 16 passes through the countersunk hole and the through hole of the lower mold spring clip 9 in sequence, it is screwed into the threaded channel 15 of the piston rod 12 to realize the connection of the lower mold guide core 10, the lower mold spring clip 9 and the piston rod 12.

[0022] The piston rod 12 of the locking cylinder extends and retracts vertically, thereby driving the lower mold spring clip 9 to move up and down, thus controlling whether the lower mold spring clip 9 is open or not.

[0023] In this embodiment, the lower section of the lower mold spring clip 9 is a cylindrical elastic section 17. Multiple water passage holes 18 are circumferentially opened at the upper end of the elastic section 17, and multiple slits 19 are circumferentially opened on the upper part of the elastic section 17. The upper ends of the multiple slits 19 are connected to the multiple water passage holes 18 in a one-to-one correspondence. The elastic section 17 is divided by the multiple slits 19 to form several elastic pieces 20. In this embodiment, six water passage holes 18 are evenly distributed circumferentially at the upper end of the elastic section 17, and six slits 19 are evenly distributed circumferentially on the elastic section 17. The elastic section 17 is divided by the six slits 19 to form six elastic pieces 20. A section of water-expanding conical surface 21 is provided on the outer wall of the lower mold expansion core 2. When the lower mold spring clip 9 moves downward relative to the lower mold expansion core 2, the multiple elastic pieces 20 of the elastic section 17 of the lower mold spring clip 9 are expanded outward in the radial direction through the water-expanding conical surface 21 of the lower mold expansion core 2. In the expanded state, a lower clamping gap 22 for clamping the lower end of the workpiece is formed between the outer wall of the elastic section 17 of the lower mold spring clip 9 and the inner wall of the vertical slide of the lower mold base.

[0024] The cylinder body 11 of the locking cylinder includes a cylinder body 23. A vertical through hole is opened in the center of the cylinder body 23. The upper and lower ends of the through hole are sealed by an upper cover plate 24 and a lower cover plate 25 that are detachably connected to the cylinder body 23. The upper cover plate 24 and the lower cover plate 25 can be connected to the cylinder body 23 by screws. Countersunk holes are provided on the upper and lower cover plates 25 for the screw heads to sink into, preventing the screw heads from protruding and avoiding interference with the fit and installation of the upper cover plate 24 and the lower mold base, and the lower cover plate 25 and the bottom plate of the water expansion machine. The cylinder body 23 has a channel, an upper cover plate 24, and a lower cover plate 25 that together form the air chamber 26 of the cylinder body 11. The piston rod 12 has a piston ring 27 at a section located in the air chamber 26. The piston ring 27 slides in fit with the air chamber 26. Vibration damping pads 28 are movably fitted on the piston rod 12 on the upper and lower sides of the piston ring 27, respectively. Both vibration damping pads 28 are located in the air chamber 26.

[0025] The upper cover plate 24 is embedded in the cylinder body 23. The top surface of the upper cover plate 24 is flush with the top surface of the cylinder body 23. The top center of the upper cover plate 24 has a recessed first positioning groove 29, and the bottom center of the lower mold base has a protruding first positioning protrusion 30. The first positioning groove 29 and the first positioning protrusion 30 fit together. The lower cover plate 25 is also embedded in the cylinder body 23. The bottom surface of the lower cover plate 25 is flush with the bottom surface of the cylinder body 23. The bottom center of the lower cover plate 25 has a protruding second positioning protrusion 31. The second positioning protrusion 31 has the same shape as the first positioning protrusion 30 so as to cooperate with the original positioning groove on the bottom plate of the water expansion machine to position the center of the locking cylinder.

[0026] A water-sealing ring 32 is embedded in the center of the top of the upper cover plate 24 and the center of the bottom of the lower cover plate 25. The inner wall of the water-sealing ring 32 is sealed to the outer wall of the piston rod 12. The water-sealing ring 32 can be made of reinforcing steel to resist high-pressure water and prevent high-pressure water from directly entering the cylinder body 11 of the locking cylinder and causing the cylinder body 11 to burst. In addition, to ensure sealing, sealing rings 33 are respectively provided between the bottom of the upper cover plate 24 and the cylinder body 23, between the top of the lower cover plate 25 and the cylinder body 23, between the center hole of the upper cover plate 24 and the piston rod 12, and between the piston and the channel wall of the cylinder body 23.

[0027] After assembling the locking structure and the lower mold assembly, the lower mold base plate 3 is fixedly installed on the bottom plate of the water expansion machine by the clamping structure, so that the bottom end of the water inlet channel 13 of the piston rod 12 of the locking cylinder is connected to the high pressure water inlet on the bottom plate of the water expansion machine, thus completing the installation of the locking structure, the lower mold assembly and the bottom of the water expansion machine.

[0028] The upper and lower mold assemblies are arranged vertically opposite each other. The main components include the upper mold 34, upper mold base plate 35, upper mold base 36, upper mold expansion core 37, upper mold spring clip 38, upper mold guide contact core 39, and upper mold ejection spring 40. The upper mold guide contact core 39, upper mold spring clip 38, and upper mold expansion core 37 are connected together by a screw 16. When the upper mold spring clip 38 is in the expanded state, an upper clamping gap 41 is formed between the outer wall of the elastic section 17 of the upper mold spring clip 38 and the inner wall of the vertical slide rail of the upper mold base, for clamping the upper end of the workpiece. The upper mold base plate 35 is mounted on the top plate of the hydraulic expansion machine via a clamping structure.

[0029] The working process of this embodiment is as follows: In the initial state, the piston rod 12 of the locking cylinder is extended upwards. The tubular blank is placed downwards along the annular gap between the lower die guide core 10 and the lower die 1 until the lower end of the tubular blank is inserted into the gap between the elastic section 17 of the lower die spring clip 9 and the vertical slide of the lower die base, thus completing the loading.

[0030] Then, the top plate of the hydraulic riser moves downward, causing the upper mold assembly to move downward as well. The upper mold guide core 39 and the lower mold guide core 10 first come into contact and are subjected to force, causing the upper mold guide core 39 to move the upper mold spring clip 38 upward together, while the lower mold guide core 10 moves the lower mold spring clip 9 downward together. The upper mold ejection spring 40 and the lower mold ejection spring 7 are compressed, thereby expanding the elastic segments 17 of the upper mold spring clip 38 and the lower mold spring clip 9 radially outward, thus clamping the upper and lower ends of the tubular blank in the upper clamping gap 41 and the lower clamping gap 22 respectively, until the upper mold cavity of the upper mold 34 and the lower mold cavity 8 of the lower mold 1 are closed, completing the mold closing. After the mold closing is completed, the piston rod 12 of the locking cylinder is in the downward retracted state.

[0031] When the high-pressure water supply system of the water expansion machine is working, high-pressure water enters the water inlet channel 13 inside the piston rod 12 of the locking cylinder through the high-pressure water inlet on the bottom plate of the water expansion machine and flows upward. It flows out from the water outlet 14 of the extended section of the piston rod 12 to the lower mold spring clip 9, and enters the tubular blank through multiple water passage holes 18 and multiple gaps 19 of the lower mold spring clip 9 to complete the water expansion forming.

[0032] After the high-pressure water supply system of the water expansion machine finishes working and the high-pressure water is depressurized, the top plate of the water expansion machine moves upward, driving the upper mold assembly to move upward synchronously. The upper mold 34 gradually separates from the lower mold 1. Under the action of the upper mold ejection spring 40, the upper mold spring clip 38 gradually moves downward and resets. The upper mold spring clip 38 gradually returns to its initial retracted state and disengages from the upper end of the workpiece. Since the piston rod 12 of the locking cylinder is in the downward retracted state, the lower mold spring clip 9 is always in the expanded state. The lower end of the workpiece is still clamped in the lower clamping gap 22. Therefore, the workpiece will not be moved upward with the upper mold assembly, ensuring that the workpiece is always in the lower mold assembly during the mold opening process.

[0033] After the mold is opened, the piston rod 12 of the locking cylinder extends upward, causing the lower mold spring clip 9 to move upward together. The lower mold spring clip 9 gradually disengages from the lower mold expansion core 2 and returns to its initial retracted state. The lower mold ejection spring 7 pushes the lower mold expansion core 2 upward to complete the demolding of the workpiece. Then, the robot arm grabs the workpiece located on the lower mold 1 to complete the unloading.

[0034] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lower mold locking structure for a water-expanding mold, the water-expanding mold including a lower mold assembly, the lower mold assembly including a lower mold and a lower mold base connected vertically, the lower mold base having a lower mold expansion core that can elastically expand and contract vertically within a vertical slide rail, the upper section of the lower mold expansion core extending into the lower mold cavity of the lower mold and fitted with a lower mold spring clip, characterized in that: The bottom end of the lower mold base is provided with a locking structure, which includes a locking cylinder. The cylinder body of the locking cylinder is installed with the lower mold base. The upper end of the piston rod of the locking cylinder passes through the lower mold base and the lower mold expansion core in sequence. The part of the piston rod that extends upward out of the lower mold expansion core is called the extension section. The piston rod is a hollow rod structure with an internal water inlet channel. A water outlet hole is opened on the extension section of the piston rod. The extension section of the piston rod is connected to the lower mold spring clip. By vertically extending and retracting the piston rod of the locking cylinder, the lower mold spring clip is driven to move up and down, thereby realizing the control of whether the lower mold spring clip is open or not.

2. The lower mold locking structure of a water-expanding mold as described in claim 1, characterized in that: The section of the water inlet channel near the top of the piston rod is a threaded hole. A screw is passed through the lower mold spring clip and screwed into the threaded hole at the top of the piston rod to connect the lower mold spring clip and the piston rod.

3. The lower mold locking structure of a water-expanding mold as described in claim 2, characterized in that: The lower die spring clip is provided with a lower die guide core above it. The lower die guide core has a countersunk hole. After the screw passes through the countersunk hole and the through hole of the lower die spring clip in sequence, it is tightened into the threaded channel of the piston rod, thereby realizing the connection between the lower die guide core, the lower die spring clip and the piston rod.

4. The lower mold locking structure of a water-expanding mold as described in claim 1, characterized in that: The locking cylinder includes a cylinder body with a vertical through-hole in the center. The upper and lower ends of the through-hole are sealed by upper and lower cover plates that are detachably connected to the cylinder body. The through-hole, upper cover plate, and lower cover plate together form the air chamber of the cylinder. A piston ring is provided on the piston rod at the section located in the air chamber. The piston ring slides in the air chamber. Vibration damping pads are movably fitted on the piston rod on the upper and lower sides of the piston ring, respectively. Both vibration damping pads are located in the air chamber.

5. The lower mold locking structure of a water-expanding mold as described in claim 4, characterized in that: The upper cover plate is embedded in the cylinder body. The top surface of the upper cover plate is flush with the top surface of the cylinder body. The top center of the upper cover plate is provided with a recessed first positioning groove, and the bottom center of the lower mold base is provided with a protruding first positioning protrusion. The first positioning groove and the first positioning protrusion fit together.

6. The lower mold locking structure of a water-expanding mold as described in claim 4, characterized in that: The lower cover plate is embedded in the cylinder body. The bottom surface of the lower cover plate is flush with the bottom surface of the cylinder body. A second positioning protrusion is provided at the center of the bottom surface of the lower cover plate. The second positioning protrusion has the same shape as the first positioning protrusion.

7. The lower mold locking structure of a water-expanding mold as described in claim 4, characterized in that: A water-sealing ring is embedded in the center of the top of the upper cover plate and the center of the bottom of the lower cover plate, and the inner wall of the water-sealing ring is sealed to the outer wall of the piston rod.

8. The lower mold locking structure of a water-expanding mold as described in claim 1, characterized in that: The lower section of the lower mold spring clip is a cylindrical elastic section. Multiple water passage holes are opened circumferentially at the upper end of the elastic section, and multiple slits are opened circumferentially at the upper end of the elastic section. The upper ends of the multiple slits are connected to the multiple water passage holes one by one. The elastic section is divided into several elastic pieces by the multiple slits. A section of water-expanding cone surface is provided on the outer wall of the lower mold expansion core. When the lower mold spring clip moves downward relative to the lower mold expansion core, the multiple elastic pieces of the elastic section of the lower mold spring clip are expanded radially outward through the water-expanding cone surface of the lower mold expansion core. In the expanded state, a lower clamping gap is formed between the outer wall of the elastic section of the lower mold spring clip and the inner wall of the vertical slide of the lower mold base for clamping the lower end of the workpiece.

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