Secondary molding structure of front door of clothes dryer

Abstract

The application relates to the technical field of household appliance sheet metal die technology, and discloses a dry clothes machine front sealing door die inner secondary forming structure which comprises an upper die base, an upper stripper, a small sink platform forming punch, a large sink platform forming punch and a concave die plate, the small sink platform forming punch is fixedly arranged on the upper die base; the large sink platform forming punch is movably arranged on the upper stripper through a large sink platform forming punch elastic element and a large sink platform forming punch distance limiting structure; the upper stripper is movably arranged on the upper die base through an upper stripper elastic element and an upper stripper distance limiting structure; the lower surfaces of the small sink platform forming punch, the large sink platform forming punch and the upper stripper are in a stepped distribution in an initial state, and the upper stripper, the large sink platform forming punch and the small sink platform forming punch sequentially contact and press the product in a die closing process. The application has the effect of improving the stamping quality of the sheet metal.

Description

Technical Field

[0001] This application relates to the field of sheet metal mold technology for home appliances, and in particular to a secondary forming structure inside the mold of the front sealing door of a clothes dryer. Background Technology

[0002] The front door of a dryer is an important part of its appearance and structure, and its surface usually has a recessed area of ​​varying sizes for mounting components such as the observation window and control panel. These sheet metal parts are typically formed in a single stamping process using a mold, requiring a high degree of surface flatness.

[0003] In existing dryer front door forming molds, the punches used to form the large recessed platform and the large recessed platform are usually of a one-piece structure. In this structure, because the forming depth of the small recessed platform is deeper, the small recessed platform forming punch is higher than the large recessed platform forming punch.

[0004] In this structure, during the mold-forming process, the smaller countersunk punch, being higher, contacts the sheet metal and begins forming before the larger countersunk punch. At this point, the sheet metal in the smaller countersunk area is not yet effectively restrained by the surrounding pressure force. This premature forming without pressure causes the material to flow into the smaller countersunk area too early and too quickly.

[0005] Uncontrolled material flow can cause a series of problems, the most significant of which is severe wrinkling and denting defects on the flat surface around the small sinker. These defects not only affect the appearance quality of the product, but also often require additional leveling or repair processes, reducing production efficiency and product yield, and increasing production costs. Utility Model Content

[0006] In order to improve the stamping quality of sheet metal, this application provides a secondary forming structure in the mold of the front sealing door of a dryer.

[0007] The technical solution for the secondary forming structure inside the mold of the front sealing door of a clothes dryer provided in this application is as follows: A secondary forming structure inside the front sealing mold of a clothes dryer includes an upper mold base, an upper stripping plate, a small recessed platform forming punch, a large recessed platform forming punch, and a concave template, wherein the small recessed platform forming punch is fixedly disposed on the upper mold base; The large sinking platform forming punch is movably set on the upper ejector plate through the large sinking platform forming punch elastic element and the large sinking platform forming punch limiting structure; The upper ejector plate is movably mounted on the upper mold base via an upper ejector plate elastic element and an upper ejector plate limiting structure; The lower surfaces of the small sinker forming punch, the large sinker forming punch, and the upper ejector plate are initially distributed in a stepped manner. During the mold closing process, the upper ejector plate, the large sinker forming punch, and the small sinker forming punch sequentially contact and press the product.

[0008] Optionally, an upper ejector plate guide assembly is provided between the upper ejector plate and the upper mold base.

[0009] Optionally, a guide assembly for the large sinking platform forming punch is provided between the large sinking platform forming punch and the upper stripper plate.

[0010] Optionally, the large sinker forming punch spacing structure and the upper ejector plate spacing structure are spacing bolts.

[0011] Optionally, both the large sinker forming punch elastic element and the upper ejector plate elastic element are nitrogen springs.

[0012] In summary, this application includes at least one of the following beneficial technical effects: 1. By using the stepped distribution of the small sinker forming punch, the large sinker forming punch and the upper stripper plate, combined with the phased sequential action of first pressing, then large forming and finally fine forming, the material flow is gradually constrained, avoiding premature or disordered material flow in some areas, thereby completely eliminating wrinkles and depressions on the plane, and significantly improving the flatness and consistency of the front sealing door surface of the dryer. 2. Under the action of a nitrogen spring, the large countersink forming punch maintains a constant pressure on the formed area throughout the mold closing process; at the same time, the upper ejector plate also presses down on the periphery of the sheet metal under the action of a nitrogen spring. This dual continuous pressure effectively suppresses material springback and displacement, ensuring that the depth and contour dimensions of the large and small countersinks are stable and consistent in mass production, reducing the scrap rate; 3. Nitrogen springs are used as the elastic elements for the large countersunk forming punch and the upper ejector plate, and are equipped with limiting bolts to precisely control the stroke. When the mold closes, the nitrogen springs are compressed and store energy, automatically limiting their position upon reaching the desired location. When the mold opens, the nitrogen springs release energy, sequentially pushing the large countersunk forming punch and the upper ejector plate back to their original positions. This allows for rapid reset without additional power, ensuring high precision and fast cycle speed for each forming process, significantly improving production line efficiency and mold life. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0014] Figure 2 This is a schematic diagram illustrating the contact between the upper stripper plate and the concave template in an embodiment of this application.

[0015] Figure 3 This is a schematic diagram illustrating the contact between the large sinker forming punch and the concave template in an embodiment of this application.

[0016] Figure 4 This is a schematic diagram illustrating the contact between the small sinker forming punch and the concave template in an embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 1. Upper base plate; 2. Upper pad; 3. Upper mold base; 4. Upper ejector plate; 5. Concave mold plate; 6. Mold frame guide assembly; 7. Lower pad; 8. Lower mold base; 9. Lower pad; 10. Lower base plate; 11. Upper ejector plate nitrogen spring; 12. Small countersunk forming punch; 13. Large countersunk forming nitrogen spring; 14. Large countersunk forming punch distance limiting bolt; 15. Large countersunk forming punch; 16. Large countersunk forming punch guide assembly; 17. Upper ejector plate distance limiting bolt; 18. Upper ejector plate guide assembly. Detailed Implementation

[0018] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0019] This application discloses a secondary forming structure inside the mold of the front sealing door of a clothes dryer.

[0020] A secondary forming structure within the front sealing mold of a clothes dryer includes an upper mold base 3, an upper ejector plate 4, a small recessed forming punch 12, a large recessed forming punch 15, and a concave mold plate 5. The small recessed forming punch 12 is fixedly mounted on the upper mold base 3. The large recessed forming punch 15 is movably mounted on the upper ejector plate 4 via an elastic element and a limiting structure. The upper ejector plate 4 is movably mounted on the upper mold base 3 via an elastic element and a limiting structure. The lower surfaces of the small recessed forming punch 12, the large recessed forming punch 15, and the upper ejector plate 4 are initially arranged in a stepped pattern, creating a height difference.

[0021] During the mold closing process, the mold components operate sequentially according to a preset order: First, the lowermost upper ejector plate 4, under the action of the elastic element, contacts the sheet metal and applies pressure, constraining the material flow area; next, the large recessed platform forming punch 15 contacts the product and moves downward, completing the forming of the large recessed platform area, stopping when it reaches the lower limit position defined by the limiting structure; finally, the small recessed platform forming punch 12, fixed to the upper mold base 3, continues to descend, completing the final forming of the small recessed platform. Throughout this process, the large recessed platform forming punch 15 maintains pressure on the formed area under the action of the elastic element.

[0022] By combining phased sequential molding with continuous pressing, the flow path and speed of the material during the molding process are effectively constrained, eliminating planar wrinkling and depression defects caused by premature or disordered local material flow, and significantly improving the consistency and stability of product surface quality.

[0023] The upper mold base 3 is mounted on the upper base plate 1 via upper pads 2, and the upper base plate 1 is fixed to the upper worktable of the press. In the lower mold section, the concave mold plate 5 is mounted on the lower mold base 8 via a lower pad 7, and the lower mold base 8 is mounted on the lower base plate 10 via lower pads 9, and the lower base plate 10 is fixed to the lower worktable of the press. A mold frame guide assembly 6 is provided between the upper mold base 3 and the lower mold base 8 to ensure mold closing accuracy.

[0024] An upper ejector plate guide assembly 18 is provided between the upper ejector plate 4 and the upper mold base 3. During the mold closing and mold opening process, the upper ejector plate 4 moves up and down relative to the upper mold base 3 along the trajectory specified by the upper ejector plate guide assembly 18 under the action of the elastic element of the upper ejector plate 4.

[0025] A large sinking platform forming punch guide assembly 16 is provided between the large sinking platform forming punch 15 and the upper stripper plate 4. Under the action of the elastic element of the large sinking platform forming punch 15, the large sinking platform forming punch 15 moves downward relative to the upper stripper plate 4 along the trajectory defined by the large sinking platform forming punch guide assembly 16.

[0026] Both the large-diameter forming punch 15 and the upper ejector plate 4 have limiting bolts. Specifically, the large-diameter forming punch 15 has a limiting bolt 14, and the upper ejector plate 4 has a limiting bolt 17. The large-diameter forming punch limiting bolt 14 is installed between the large-diameter forming punch 15 and the upper ejector plate 4, while the upper ejector plate limiting bolt 17 is installed between the upper ejector plate 4 and the upper mold base 3. During mold closing, when the large-diameter forming punch 15 descends to a predetermined position, the limiting surface of its corresponding limiting bolt contacts the upper ejector plate 4, preventing further descent. Similarly, when the upper ejector plate 4 moves to its end point of travel, its upper ejector plate limiting bolt 17 contacts the upper mold base 3 to achieve limiting.

[0027] Both the large sinking forming punch 15 and the upper ejector plate 4 are nitrogen springs. Specifically, the large sinking forming punch 15 has a large sinking nitrogen spring 13, and the upper ejector plate 4 has an upper ejector plate nitrogen spring 11. The large sinking forming punch 15 nitrogen spring is installed between the large sinking forming punch 15 and the upper ejector plate 4, and the upper ejector plate nitrogen spring 11 is installed between the upper ejector plate 4 and the upper mold base 3, providing a stable and reliable elastic force source for the relative movement of each component.

[0028] During the mold closing process, the nitrogen spring is compressed and stores energy, providing downward elastic pressure to each moving component; during the mold opening process, the nitrogen spring releases energy, pushing the large sinker forming punch 15 and the upper ejector plate 4 back to their initial positions in sequence, preparing for the next forming cycle.

[0029] The implementation principle of the secondary forming structure in the front sealing mold of a clothes dryer according to an embodiment of this application is as follows: In the mold closing stage, the upper ejector plate 4 first contacts the sheet material and applies pressure under the action of a nitrogen spring. Subsequently, the large sinking platform forming punch 15 descends along the guide assembly to form the large sinking platform area of ​​the sheet material, and stops moving when its limiting bolt contacts the upper ejector plate 4. Finally, the small sinking platform forming punch 12 continues to descend to complete the final forming of the small sinking platform area. At the same time, the large sinking platform forming punch 15 maintains pressure on the formed area under the continuous action of the nitrogen spring to control material flow and prevent defects. In the mold opening stage, the nitrogen spring releases energy, pushing the large sinking platform forming punch 15 and the upper ejector plate 4 back to their initial positions in sequence, ready to enter the next forming cycle. The entire process effectively improves the surface quality and forming stability of the product through the combination of staged sequential forming and continuous pressure.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A secondary forming structure within the front sealing mold of a clothes dryer, comprising an upper mold base, an upper stripper plate, a small recessed forming punch, a large recessed forming punch, and a concave mold plate, characterized in that: The small countersunk forming punch is fixedly mounted on the upper die base; The large sinking platform forming punch is movably set on the upper ejector plate through the large sinking platform forming punch elastic element and the large sinking platform forming punch limiting structure; The upper ejector plate is movably mounted on the upper mold base via an upper ejector plate elastic element and an upper ejector plate limiting structure; The lower surfaces of the small sinker forming punch, the large sinker forming punch, and the upper ejector plate are initially distributed in a stepped manner. During the mold closing process, the upper ejector plate, the large sinker forming punch, and the small sinker forming punch sequentially contact and press the product.

2. The secondary forming structure inside the front sealing mold of a clothes dryer according to claim 1, characterized in that: An upper ejector plate guide assembly is provided between the upper ejector plate and the upper mold base.

3. The secondary forming structure inside the front sealing mold of a clothes dryer according to claim 1, characterized in that: A guide assembly for the large sinking platform forming punch is provided between the large sinking platform forming punch and the upper stripper plate.

4. The secondary forming structure inside the front sealing mold of a clothes dryer according to claim 1, characterized in that: The large sinking platform forming punch spacing structure and the upper stripping plate spacing structure are spacing bolts.

5. The secondary forming structure inside the front sealing mold of a clothes dryer according to claim 1, characterized in that: Both the large sinker forming punch elastic element and the upper ejector plate elastic element are nitrogen springs.

Images