Stretching cold compound bottom die structure

Abstract

The utility model discloses a stretching cold compound bottom die structure. The stretching cold compound bottom die structure comprises an upper bottom plate, a male die, a lower bottom plate, a female die, a material returning plate and a material returning core driven by existing driving equipment to ascend and descend. The male die is detachably installed at the bottom of the upper bottom plate. The female die is detachably mounted on the lower bottom plate; the male die and the female die are coaxially arranged; a through hole is formed in the center of the female die. The material returning core is located in the through hole and can move up and down along the through hole. The male die is embedded into the through hole of the female die along with descending of the upper bottom plate and is close to the material returning core, and the male die is far away from the female die along with ascending of the upper bottom plate; the stripper plate is arranged on the periphery of the male die in a sleeving manner and can slide along the male die, and a telescopic structure used for jacking the stripper plate is arranged between the stripper plate and the upper bottom plate; a limiting structure used for preventing the stripper plate from falling off is arranged between the stripper plate and the male die. The die is simple in structure and can ensure the concentricity of a material sheet and a bottom sheet; according to the structure, a cold composite bottom process and a stretching process are combined together, so that the two processes can be realized on one piece of equipment, the equipment cost is saved, and the efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of workpiece processing mold technology, and in particular to a stretching cold recovery bottom mold structure. Background Technology

[0002] Aluminum products are mainly classified into single-bottom, cold-coated bottom, and hot-coated bottom types. Some special types are hot-melt injection bottoms. This structure is mainly used in cold-coated bottom products, especially cold-coated bottom stretch products. It optimizes the forming process of cold-coated bottom stretch aluminum products. The existing process involves cold-coating the aluminum sheet and then stretching it. These two processes require two sets of molds. After these two processes, the diameter of the aluminum sheet will increase, requiring an additional rounding process. Furthermore, because two sets of molds are used for the first two processes, they cannot be 100% concentric, resulting in product eccentricity, which has a significant impact on product quality. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a stretching cold-recovery bottom mold structure.

[0004] This utility model is achieved through the following technical solution: a stretching cold-forming die structure, including an upper die, a lower die, an ejector plate, and an ejector core driven and lifted by an existing driving device; the upper die includes an upper base plate and a punch, the punch being detachably mounted on the bottom of the upper base plate; the lower die includes a lower base plate and a die, the die being detachably mounted on the lower base plate; the punch and the die are coaxially arranged; a through hole is provided in the center of the die, the ejector core is located in the through hole and can move up and down along the through hole; the punch is embedded in the through hole of the die and approaches the ejector core as the upper base plate descends, and the punch moves away from the die as the upper base plate rises; the ejector plate is sleeved on the outer periphery of the punch and can slide along the punch, a telescopic structure for pushing against the ejector plate is provided between the ejector plate and the upper base plate; a limiting structure for preventing the ejector plate from falling off is provided between the ejector plate and the punch.

[0005] The coaxial arrangement of the punch and die ensures that the center of the workpiece is located on the axis of the punch, allowing for precise positioning and ensuring that the edges of the workpiece and the base plate are uniformly aligned during production, preventing uneven edges or excessive thickness. The upper base plate is fixed to the existing lifting equipment, allowing the punch and the ejector plate to slide relative to each other, thus achieving the ejection function. Driven by the existing drive equipment, the ejector core lifts the product, after the workpiece and base plate are joined, from the bottom, achieving ejection and demolding. This structure combines the cold composite base and stretching process, enabling both processes to be completed on a single machine, saving equipment costs, reducing workload, and improving efficiency. The telescopic structure provides uniform ejection force, and the limiting structure prevents the ejector plate from separating from the punch and falling off.

[0006] The die includes a connecting ring, a connecting plate, and an upper pressure plate, all coaxially arranged and annular in structure. The connecting ring is fixed to the lower base plate by bolts, the connecting plate is fixed to the connecting ring by bolts, and the upper pressure plate is detachably mounted on the connecting plate by bolts. The upper pressure plate has a first annular protrusion protruding inwards from its inner side. The hole on the inner side of the connecting ring's annulus is a first through hole, the hole on the inner side of the connecting plate's annulus is a second through hole, and the hole on the inner side of the upper pressure plate's annulus is a third through hole. The first, second, and third through holes have the same diameter and together form a channel for the ejector core to slide. The diameter of the hole formed on the inner side of the first annular protrusion is smaller than the diameter of the third through hole. The die is modularly assembled, facilitating the replacement of locally worn components. The difference in diameter between the first annular protrusion and the through hole forms a stepped limiting structure, preventing the ejector core from leaving the movement range of the through hole.

[0007] The limiting structure includes a first annular groove and a second annular protrusion. The first annular groove is formed on the upper outer periphery of the punch. The second annular protrusion is formed by a ring protruding inward from the inner side of the ejector plate. The second annular protrusion is located within the first annular groove and slides up and down along it. The cooperation between the first annular groove and the second annular protrusion restricts the range of motion of the ejector plate, prevents it from falling off, improves the reliability of equipment operation, and reduces the risk of downtime caused by component detachment.

[0008] The telescopic structure is a spring, and a positioning hole is provided on the upper side of the ejector plate. The upper end of the spring is mounted on the upper base plate, and the lower end of the spring is sleeved in the positioning hole and fixed to the ejector plate. The spring, as a telescopic structure, has the advantages of low cost and easy replacement. The positioning hole ensures the alignment of the spring and the ejector plate, avoiding jamming of the ejector plate due to offset ejection force. Simultaneously, after the upper die is raised, the spring force pushes the ejector plate downwards as the ejector plate separates from the die, thereby separating the punch from the product and achieving ejection.

[0009] An annular positioning groove is formed by a recess on the inner side of the upper pressure plate. The first annular protrusion and the annular positioning groove are connected by a curved surface transition. During processing, the material sheet for manufacturing the cookware is placed in the annular positioning groove. The punch presses the material sheet down through the hole on the inner side of the first annular protrusion and into the through hole of the die until the bottom surface of the material sheet contacts the top surface of the ejector core. The annular positioning groove is used to constrain the edge of the material sheet, sealing and restraining the outward extension of the material sheet. The curved surface transition between the first annular protrusion and the annular positioning groove allows for a smooth transition during the cold composite process of the material sheet. The edge of the material sheet is subjected to uniform stress during stretching, reducing the risk of breakage due to stress concentration. The first annular protrusion can perform secondary shaping of the material sheet, enhancing the density of the composite bottom structure.

[0010] The lower inner side of the ejector plate protrudes downward to form a retaining ring, which is connected to the outer edge of the ejector plate by a curved surface transition; the curved surface of the ejector plate is positioned opposite to the curved surface of the upper pressure plate. The retaining ring facilitates the separation of the formed product from the punch.

[0011] The top surface of the ejector core is provided with a mold etching pattern for die-casting the bottom texture of the sheet. The mold etching pattern is formed in the area where the top surface of the ejector core contacts the sheet. The mold etching pattern is directly integrated into the top surface of the ejector core, and the bottom texture die-casting is completed simultaneously in the bottom forming stage, eliminating secondary processing steps, significantly improving production efficiency and reducing process complexity.

[0012] The outer diameter of the connecting ring is smaller than the outer diameter of the connecting plate, and the outer diameter of the upper pressure plate is the same as the outer diameter of the connecting plate.

[0013] A second annular groove is formed on the lower outer periphery of the upper pressure plate, and a third annular protrusion is formed by the upward protrusion of the outer periphery of the connecting plate. When the upper pressure plate is installed above the connecting plate, the third annular protrusion is embedded in the second annular groove. The interlocking structure of the annular groove and the third annular protrusion achieves radial positioning of the upper pressure plate and the connecting plate, preventing component misalignment caused by lateral forces during processing and improving the mold fitting accuracy.

[0014] The lower part of the upper base plate has a fourth annular protrusion protruding outward from the outer periphery, and the upper part of the lower base plate has a fifth annular protrusion protruding outward from the outer periphery.

[0015] Compared with existing technologies, the advantages of this utility model are as follows: the mold structure is simple and has fewer processes, which can effectively prevent the material sheet from having various diameters after impact, and eliminates the need to correct the diameter of the material sheet by rounding, thus ensuring the concentricity of the material sheet and the base sheet; this structure combines the cold composite base with the stretching process, so that the two processes can be completed on one machine, saving equipment costs, reducing workload, and improving efficiency; it can ensure that the product is not eccentric, ensure processing accuracy, and enable continuous production of products. Attached Figure Description

[0016] Figure 1 This is a longitudinal sectional view of an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0018] Figure 3 This is a schematic diagram of the structure of the bottom plate cut longitudinally in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the connecting ring cut longitudinally according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the connecting plate cut longitudinally in an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the upper pressure plate cut longitudinally in an embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the longitudinal section of the ejector core according to an embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of the longitudinal section of the ejector plate according to an embodiment of the present invention;

[0024] Figure 9 This is a schematic diagram of the longitudinal section of the punch in an embodiment of the present invention;

[0025] Figure 10 This is a schematic diagram of the structure of the base plate cut longitudinally in an embodiment of the present invention.

[0026] The meanings of the reference numerals in the attached diagram are as follows: 1. Lower base plate; 11. Fifth annular protrusion; 2. Connecting ring; 21. First through hole; 3. Connecting plate; 31. Second through hole; 32. Third annular protrusion; 4. Upper pressure plate; 41. First annular protrusion; 42. Third through hole; 43. Annular positioning groove; 44. Second annular groove; 5. Ejector core; 6. Ejector plate; 61. Second annular protrusion; 62. Positioning hole; 63. Retaining ring; 7. Punch; 71. First annular groove; 8. Upper base plate; 81. Fourth annular protrusion; 9. Material sheet; 10. Spring. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] Example

[0029] See Figures 1 to 10 This is a stretching cold-forming die structure, including an upper die, a lower die, an ejector plate 6, and an ejector core 5 driven and lifted by an existing drive device. The upper die includes an upper base plate 8 and a punch 7, which is detachably mounted on the bottom of the upper base plate 8. The lower die includes a lower base plate 1 and a die, which is detachably mounted on the lower base plate 1. The punch 7 and the die are coaxially arranged. A through hole is opened in the center of the die, and the ejector core 5 is located in the through hole and can move up and down along the through hole. The punch 7 is inserted into the through hole of the die and approaches the ejector core 5 as the upper base plate 8 descends, and the punch 7 moves away from the die as the upper base plate 8 rises. The ejector plate 6 is sleeved on the outer periphery of the punch 7 and can slide along the punch 7. A telescopic structure for pushing against the ejector plate 6 is provided between the ejector plate 6 and the upper base plate 8. A limiting structure for preventing the ejector plate 6 from falling off is provided between the ejector plate 6 and the punch 7.

[0030] The coaxial arrangement of the punch 7 and die 9 ensures that the center of the workpiece 9 is located on the axis of the punch 7, allowing for precise positioning and ensuring that the edges of the workpiece 9 and the base plate (not shown in the figure) are uniformly flush during production, preventing uneven edges or excessive thickness. The upper base plate 8 is fixed to the existing lifting equipment, allowing the punch 7 and the ejector plate 6 to slide relative to each other, thus achieving the ejection function. Driven by the existing drive equipment, the ejector core 5 lifts the product after the workpiece 9 and the base plate are combined from the bottom, thus achieving ejection and demolding. This structure combines the cold composite base and the stretching process, enabling both processes to be completed on one machine, saving equipment costs, reducing workload, and improving efficiency. The telescopic structure provides uniform ejection force; the limiting structure prevents the ejector plate 6 from separating from the punch 7 and falling off.

[0031] The die includes a connecting ring 2, a connecting plate 3, and an upper pressure plate 4, all coaxially arranged and annular in structure. The connecting ring 2 is fixed to the lower base plate 1 by bolts, the connecting plate 3 is fixed to the connecting ring 2 by bolts, and the upper pressure plate 4 is detachably mounted on the connecting plate 3 by bolts. A first annular protrusion 41 is formed by an inward protrusion on the inner side of the upper pressure plate 4. The hole on the inner side of the annular ring of the connecting ring 2 is a first through hole 21, the hole on the inner side of the annular ring of the connecting plate 3 is a second through hole 31, and the hole on the inner side of the annular ring of the upper pressure plate 4 is a third through hole 42. The first through hole 21, the second through hole 31, and the third through hole 42 have the same diameter and together form a channel for the ejector core 5 to slide. The diameter of the hole formed on the inner side of the first annular protrusion 41 is smaller than the diameter of the third through hole 42. The die is modularly assembled, facilitating the replacement of locally worn components. The difference in diameter between the first annular protrusion 41 and the through hole forms a stepped limiting structure, preventing the ejector core 5 from leaving the range of motion of the through hole.

[0032] The limiting structure includes a first annular groove 71 and a second annular protrusion 61. The first annular groove 71 is formed on the upper outer periphery of the punch 7. The inner side of the ejector plate 6 protrudes inward to form the second annular protrusion 61. The second annular protrusion 61 is located within the first annular groove 71 and slides up and down along it. The cooperation between the first annular groove 71 and the second annular protrusion 61 restricts the range of motion of the ejector plate 6, prevents it from falling off, improves the reliability of equipment operation, and reduces the risk of downtime caused by component detachment.

[0033] The telescopic structure is a spring 10, and a positioning hole 62 is provided on the upper side of the ejector plate 6. The upper end of the spring 10 is mounted on the upper base plate 8, and the lower end of the spring 10 is sleeved in the positioning hole 62 and fixed to the ejector plate 6. As a telescopic structure, the spring 10 has the advantages of low cost and easy replacement. The positioning hole 62 can ensure the alignment of the spring 10 and the ejector plate 6, avoiding jamming of the ejector plate 6 due to the offset of the ejection force. At the same time, after the upper mold is raised, since the ejector plate 6 separates from the die, the elastic force of the spring 10 pushes the ejector plate 6 downward, thereby separating the punch 7 from the product and realizing ejection.

[0034] An annular positioning groove 43 is formed by a recess on the inner side of the upper pressure plate 4. The first annular protrusion 41 and the annular positioning groove 43 are connected by a curved surface transition. During processing, the sheet material 9 used to manufacture the cookware is placed in the annular positioning groove 43. The punch 7 presses down the sheet material 9 through the hole on the inner side of the first annular protrusion 41 and into the through hole of the die until the bottom surface of the sheet material 9 contacts the top surface of the ejector core 5. The annular positioning groove 43 is used to constrain the edge of the sheet material 9 and to seal and constrain the outward extension of the sheet material 9. The curved surface transition between the first annular protrusion 41 and the annular positioning groove 43 allows the cold composite process of the sheet material 9 to have a smooth transition. The edge of the sheet material 9 is subjected to uniform stress during the stretching process, reducing the risk of cracking due to stress concentration. The first annular protrusion 41 can perform secondary forming on the sheet material 9, enhancing the density of the composite bottom structure.

[0035] The lower inner side of the ejector plate 6 protrudes downward to form a retaining ring 63. The retaining ring 63 is connected to the outer edge of the ejector plate 6 by a curved surface transition. The curved surface of the ejector plate 6 is opposite to the curved surface of the upper pressure plate 4. The retaining ring 63 is designed to facilitate the separation of the formed product from the punch 7.

[0036] The top surface of the ejector core 5 is provided with a mold texture (not shown in the figure) for die-casting the bottom texture of the sheet 9. The mold texture is formed in the area where the top surface of the ejector core 5 contacts the sheet 9. The mold texture is directly integrated into the top surface of the ejector core 5, and the bottom texture die-casting is completed simultaneously in the bottom forming stage, eliminating secondary processing steps, significantly improving production efficiency and reducing process complexity.

[0037] The outer diameter of the connecting ring 2 is smaller than the outer diameter of the connecting plate 3, and the outer diameter of the upper pressure plate 4 is the same as the outer diameter of the connecting plate 3.

[0038] A second annular groove 44 is formed on the lower outer periphery of the upper pressure plate 4, and a third annular protrusion 32 is formed by the upward protrusion of the outer periphery of the connecting plate 3. When the upper pressure plate 4 is installed above the connecting plate 3, the third annular protrusion 32 is embedded in the second annular groove 44. The interlocking structure of the annular groove and the third annular protrusion 32 achieves radial positioning of the upper pressure plate 4 and the connecting plate 3, preventing component misalignment caused by lateral forces during processing and improving the mold fitting accuracy.

[0039] The lower outer periphery of the upper base plate 8 has a fourth ring protrusion 81, and the upper outer periphery of the lower base plate 1 has a fifth ring protrusion 11.

[0040] In this embodiment, the mold etching, also known in the industry as mold core lettering, involves creating text grooves or protrusions on the surface of the mold core through CNC engraving, laser etching, or electrical discharge machining (EDM). This is used to die-cast anti-slip textures onto the substrate surface. This is existing technology and does not require detailed structural analysis. The sheet material 9 is the sheet material awaiting processing. The upper base plate 8 is raised and lowered using existing driving equipment (a practical winding machine that uses pressure to bond the substrate and sheet material 9 together). This is a mature existing technology and does not require detailed structural analysis. In this embodiment, the ejector core 5 is raised and lowered using existing driving equipment, which is also a mature existing technology and does not require detailed structural analysis. The ejector core 5 can also have a lifting rod at its lower part. The lifting rod is driven by a motor-driven telescopic rod, or a hydraulic rod can be used directly for lifting and lowering. The ejector core 5 can also have an air blowing channel connected to an air tank. After the sheet material 9 is made into a finished product (cookware), air blowing can lift the finished product (cookware) and detach it from the ejector core 5. The lifting rod, telescopic rod, and air blowing channel are all existing equipment and do not require detailed structural analysis.

[0041] The processing method for this structure includes the following steps:

[0042] Step 1: Position the film on the die texture of the ejector core 5;

[0043] Step 2: After brushing oil onto the material sheet 9, place it in the annular positioning groove 43 of the upper pressure plate 4;

[0044] Step 3: The upper mold moves downward, causing the sheet 9 to bend into a pot body along the arc surface between the first annular protrusion 41 and the annular positioning groove 43. Then, the upper and lower molds are closed, and the pressure is increased by the drive equipment to make the bottom sheet bonded to the pot body. During the bonding process, the mold etching (or die casting) forms the bottom sheet texture.

[0045] Step 4: The upper mold rises, and the spring 10 slides against the ejector plate 6, causing the pot body to separate from the punch 7; the ejector core 5 moves upward, lifting the pot body; the pot body is then removed by a robot or manually and sent to the next process.

[0046] The above detailed description is a specific description of a feasible embodiment of the present utility model. This embodiment is not intended to limit the patent scope of the present utility model. All equivalent implementations or modifications that do not depart from the present utility model should be included in the patent scope of this case.

Claims

1. A stretching cold-recovery bottom mold structure, characterized in that: The device includes an upper die, a lower die, an ejector plate, and an ejector core that is driven and lifted by an existing drive device. The upper die includes an upper base plate and a punch, the punch being detachably mounted on the bottom of the upper base plate. The lower die includes a lower base plate and a die, the die being detachably mounted on the lower base plate. The punch and the die are coaxially arranged. A through hole is provided in the center of the die, and the ejector core is located in the through hole and can move up and down along the through hole. As the upper base plate descends, the punch is embedded in the through hole of the die and approaches the ejector core. As the upper base plate rises, the punch moves away from the die. The ejector plate is sleeved on the outer periphery of the punch and can slide along the punch. A telescopic structure for supporting the ejector plate is provided between the ejector plate and the upper base plate. A limiting structure for preventing the ejector plate from falling off is provided between the ejector plate and the punch.

2. The stretching cold-recovery bottom mold structure according to claim 1, characterized in that: The die includes a connecting ring, a connecting plate, and an upper pressure plate, all coaxially arranged and annular in structure. The connecting ring is fixed to the lower base plate by bolts, the connecting plate is fixed to the connecting ring by bolts, and the upper pressure plate is detachably mounted on the connecting plate by bolts. The upper pressure plate has a first annular protrusion protruding inward from its inner side. The hole on the inner side of the connecting ring is a first through hole, the hole on the inner side of the connecting plate is a second through hole, and the hole on the inner side of the upper pressure plate is a third through hole. The first, second, and third through holes have the same diameter and together form a channel for the ejector core to slide. The diameter of the hole formed on the inner side of the first annular protrusion is smaller than the diameter of the third through hole.

3. The stretching cold-recovery bottom mold structure according to claim 1, characterized in that: The limiting structure includes a first annular groove and a second annular protrusion. The first annular groove is formed on the upper outer periphery of the punch. The inner side of the ejector plate protrudes inward to form the second annular protrusion. The second annular protrusion is located in the first annular groove and slides up and down along it.

4. The stretching cold-recovery bottom mold structure according to claim 1, characterized in that: The telescopic structure is a spring, and a positioning hole is provided on the upper side of the ejector plate; the upper end of the spring is installed on the upper base plate, and the lower end of the spring is sleeved in the positioning hole and fixed to the ejector plate.

5. The stretching cold-recovery bottom mold structure according to claim 2, characterized in that: An annular positioning groove is formed by a recess on the inner side of the upper pressure plate. The first annular protrusion and the annular positioning groove are connected by a curved surface transition. During processing, the material sheet for making the cookware is placed in the annular positioning groove. The punch presses the material sheet down through the hole on the inner side of the first annular protrusion and into the through hole of the die until the bottom surface of the material sheet contacts the top surface of the ejector core.

6. The stretching cold-recovery bottom mold structure according to claim 5, characterized in that: The lower inner side of the ejector plate protrudes downward to form a retaining ring, and the retaining ring is connected to the outer edge of the ejector plate through a curved surface transition; the curved surface of the ejector plate is opposite to the curved surface of the upper pressure plate.

7. The stretching cold-recovery bottom mold structure according to claim 1, characterized in that: The top surface of the ejector core is provided with mold etching for die-casting patterns on the bottom of the sheet, and the mold etching is formed in the area where the top surface of the ejector core contacts the sheet.

8. The stretching cold-recovery bottom mold structure according to claim 2, characterized in that: The outer diameter of the connecting ring is smaller than the outer diameter of the connecting plate, and the outer diameter of the upper pressure plate is the same as the outer diameter of the connecting plate.

9. The stretching cold-recovery bottom mold structure according to claim 2, characterized in that: A second annular groove is formed on the lower outer periphery of the upper pressure plate, and a third annular protrusion is formed by the outer periphery of the connecting plate protruding upward. When the upper pressure plate is installed above the connecting plate, the third annular protrusion is embedded in the second annular groove.

10. The stretching cold-recovery bottom mold structure according to claim 1, characterized in that: The lower part of the upper base plate has a fourth annular protrusion protruding outward from the outer periphery, and the upper part of the lower base plate has a fifth annular protrusion protruding outward from the outer periphery.

Images