CN113352808B - Thin-walled metal shell full-body pattern forming mold and processing technology using the mold - Google Patents
Thin-walled metal shell full-body pattern forming mold and processing technology using the mold Download PDFInfo
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- CN113352808B CN113352808B CN202110643684.7A CN202110643684A CN113352808B CN 113352808 B CN113352808 B CN 113352808B CN 202110643684 A CN202110643684 A CN 202110643684A CN 113352808 B CN113352808 B CN 113352808B
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- 239000002184 metal Substances 0.000 title claims abstract description 88
- 238000005516 engineering process Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000005498 polishing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 description 10
- 238000003825 pressing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 241000190070 Sarracenia purpurea Species 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010023 transfer printing Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
- B44B5/02—Dies; Accessories
- B44B5/026—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
- B44B5/0052—Machines or apparatus for embossing decorations or marks, e.g. embossing coins by pressing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
本发明公开了一种降低加工精度、扩大适用范围的薄壁金属外壳全身图案成型模具及使用该模具的加工工艺，其模具包括上模组件、下模型腔组件、下模内模组件和下模卸料组件；上模组件包括上模型腔头、内壁设有斜面的哈弗套；下模型腔组件包括下模型腔头、至少三个径向活动且周向均布的型腔；型腔内表面设有图案，外表面设有与哈弗套内壁相配合的斜面；下模内模组件包括下芯棒和夹紧组件；下模卸料组件包括固定板和卸料弹簧；将一端或两端开口的薄壁金属外壳进行退火、抛光处理后，放入模具，合模时哈弗套径向向内收拢夹紧工件，同时形成内壁有图纹的加工型腔，高压水由下芯棒进水通道进入，使工件向外膨胀贴紧型腔直至全身表面图案成型。
The invention discloses a whole-body pattern forming die for a thin-walled metal shell with reduced processing precision and expanded application scope, and a processing technology using the die. The die comprises an upper die assembly, a lower mold cavity assembly, a lower mold inner mold assembly and a lower mold unloading assembly; the upper die assembly comprises an upper mold cavity head and a Havers sleeve with an inclined surface on the inner wall; the lower mold cavity assembly comprises a lower mold cavity head and at least three radially movable and circumferentially uniformly distributed cavities; the inner surface of the cavity is provided with a pattern, and the outer surface is provided with an inclined surface matching the inner wall of the Havers sleeve; the lower mold inner mold assembly comprises a lower core rod and a clamping assembly; the lower mold unloading assembly comprises a fixed plate and an unloading spring; a thin-walled metal shell with one or both ends opened is annealed and polished, and then placed in the die. When the die is closed, the Havers sleeve radially retracts inward to clamp the workpiece, and at the same time forms a processing cavity with a pattern on the inner wall. High-pressure water enters from the water inlet channel of the lower core rod, so that the workpiece expands outward and adheres to the cavity until the whole-body surface pattern is formed.
Description
Technical Field
The invention relates to a processing method of a thin-wall metal shell such as a cup body or a kettle body, in particular to a whole-body pattern forming die of the thin-wall metal shell and a processing technology using the die.
Background
The conventional surface treatment of the existing cup is generally smooth and flat, and the LOGO pattern is marked by polishing, spraying color, screen printing or laser, so that the cup is further personalized, the surface treatment patterns such as water transfer printing are formed, and one or more discontinuous LOGO patterns are punched on the surface of the cup.
At present, the conventional process is an extrusion molding process between hard films, and the conventional process can only perform one-side small-range stamping and then perform pattern stamping on the other side so as to avoid cup deformation. In order to avoid deformation of the cup during pattern stamping, a processing method is adopted by the skilled in the art, wherein continuous patterns are engraved or pressed on the metal sheet, and then the metal sheet is rolled into a cup body or a kettle body, but after the continuous patterns processed by the process are manufactured into the cylindrical cup body or the kettle body, the continuous patterns are easy to deform, the pattern butt joint difficulty at the joint is increased, and the rejection rate is higher.
Therefore, a plurality of efforts are made by the person skilled in the art, for example, patent No. ZL 202010209563.7, the patent name is "a metal water cup shell with surface continuous pressing pattern and manufacturing method thereof", which can realize one-time complete pressing of the whole body pattern of the cup body, and the pattern is continuous, beautiful and seamless, but the process has limitations, firstly, the pattern is stressed simultaneously on the inner and outer surfaces of the thin-wall metal shell through the male die and the female die, the pattern is pressed, the relative position of the male die and the female die is ensured not to deviate at the moment when the male die and the female die are closed, the requirement on the accuracy of the die is higher, the processing cost is higher, secondly, the inner core inner die is a hard die, the single side of the movable range of the inner core is not more than 2mm, only the cup body with the single side of which the upper diameter and the lower diameter is not more than 2mm is needed to process the continuous pattern, and the process is not applicable to the over-range or special-shaped products, and the application range is smaller.
Disclosure of Invention
The invention aims to provide a whole body pattern forming die for a thin-wall metal shell and a processing technology using the die, which can enlarge the application range on the premise of reducing the processing precision, can process large-size difference of upper and lower diameters or special-shaped shell surface patterns, ensures that the patterns are clear and attractive, do not deviate from deviation, can ensure that the thin-wall metal shell is not out of round or broken, and has high yield.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A whole body pattern forming die of a thin-wall metal shell comprises an upper die assembly, a lower die cavity assembly, a lower die inner die assembly and a lower die unloading assembly;
The upper die assembly comprises an upper die cavity head fixedly connected to an upper die plate and a half sleeve fixedly connected to the upper die cavity head, wherein an inclined plane is arranged on the inner wall of the half sleeve;
The lower model cavity assembly comprises a lower model cavity head fixedly connected to a lower template and at least three cavities which are radially movable and circumferentially and uniformly distributed on the lower model cavity head, wherein the outer surface of the cavity is provided with an inclined surface matched with the inner wall of the half sleeve, and the inner surface of the cavity is provided with a processed pattern;
the lower die inner die assembly comprises a lower core rod arranged in a lower die cavity head and a clamping assembly arranged between the lower die cavity head and the lower core rod, wherein a water inlet channel is arranged in the lower core rod;
The lower die unloading assembly comprises a fixed plate arranged on the lower die plate, a bolt connected between the fixed plate and the die cavity, and an unloading spring sleeved on the bolt and positioned at the outer side of the fixed plate, wherein when the upper die assembly presses down the die, the half sleeve enables the die cavity to be folded inwards in the radial direction under the action of an inclined plane matched with the die cavity, and high-pressure water enters from the water inlet channel of the lower core rod, so that the workpiece to be machined expands outwards and is tightly adhered to the die cavity until the surface pattern of the whole body is formed.
Preferably, the upper die assembly further comprises an upper die core fixed between the upper die plate and the upper die cavity head through a T-shaped groove, and the upper die core is closed, and the core rod is pressed down.
The lower die inner die assembly comprises a lower core arranged between a lower die cavity head and a lower core rod, the clamping assembly is arranged on a ring groove between the lower core rod and the lower core rod, and the clamping assembly comprises eight supporting blocks which are radially movable and circumferentially and uniformly arranged on the lower core rod, elastic parts for providing elastic restoring force for the supporting blocks, and cone blocks for supporting the supporting blocks in a matched mode with inclined planes on the inner sides of the supporting blocks.
The lower model cavity assembly further comprises at least three buckle holes Ha Fushang, the buckle holes are respectively and fixedly connected with the cavity, the lower buckle holes are fixedly connected with the lower model cavity head, and movable positioning grooves for radial movement of the upper buckle holes are formed in the lower buckle holes.
Preferably, the haversack is provided with a positioning block, and the bottom of the cavity is provided with a positioning groove matched with the positioning block.
Preferably, the lower die unloading assembly further comprises a guide block, one end of the guide block is movably inserted into the middle through hole of the fixed plate, and the other end of the guide block is fixedly connected with the die cavity.
Preferably, the guide block is fixedly connected with the upper half buckle through a dovetail groove.
Preferably, the mold cavity parting line avoids the pattern, and the mold cavity parting line is divided according to the pattern.
A processing technology of using the whole body pattern forming die of the thin-wall metal shell comprises the following steps:
Step 1, a metal disc is taken, the metal disc is stretched to form a thin-wall metal shell, the opening of the thin-wall metal shell is processed to be smooth, or a thin-wall metal round tube is taken, and the opening of the two ends of the thin-wall metal round tube is processed to be smooth, so that the thin-wall metal shell is formed;
Step 2, polishing the outer surface of the thin-wall metal shell;
step 3, inversely placing the polished thin-wall metal shell into a whole-body pattern forming die of the thin-wall metal shell to carry out whole-body pattern processing treatment;
A. The method comprises the steps of in an open mould state, inversely sleeving a polished thin-wall metal shell into a lower core rod, enabling a mouth part to be arranged between a support block and a cavity head of a lower mould, applying downward force to an upper mould plate by using pressure equipment, driving a cavity to move inwards in a radial direction by a cavity inclined surface in sliding fit with the lower mould plate, driving the cavity head of the lower mould and an upper mould core to move inwards in the radial direction by the inclined inner wall of the lower mould plate, clamping the bottom of the thin-wall metal shell by matching the lower mould core with the lower mould core, driving the lower core rod to move downwards by pressing the upper mould core, driving a cone block to move outwards in the radial direction by the inclined surface matched with the support block, clamping the mouth part of the thin-wall metal shell by the cone block to complete mould clamping, and expanding the elastic piece outwards in the radial direction by using a discharge spring to compress inwards in the state;
B. starting the water expansion equipment, and allowing high-pressure water to enter from a water inlet channel of the lower core rod, and expanding the thin-wall metal shell outwards under the action of water pressure until the thin-wall metal shell is tightly attached to the cavity until the surface pattern is formed;
C. After pattern processing is completed, the pressure equipment drives the upper die assembly to move upwards, the die cavity is opened outwards under the action of the elastic force of the unloading spring, the supporting blocks shrink inwards under the action of the elastic force of the elastic annular clamping blocks, the inward-shrinking supporting blocks drive the cone blocks to move upwards through the inclined planes matched with the inward-shrinking supporting blocks, the lower core rod is driven to reset upwards, the thin-wall metal shell is taken out, and demoulding is completed.
Preferably, the thin-walled metal casing is annealed prior to said step 2.
Compared with the prior art, the invention has the advantages that at least three radially movable and circumferentially uniformly distributed cavity inner walls are engraved with patterns, the thin-wall metal shell to be processed is expanded outwards by utilizing water pressure to be tightly adhered to the cavity until the patterns are formed, so that the water expansion mode is adopted, the expansion type stress of the thin-wall metal shell is more uniform without being limited by the activity of a hard die pattern pressing process, the processing precision is reduced, the water expansion mode is adopted, meanwhile, the pattern forming depth can be adjusted according to the tonnage of water expansion mechanical equipment, the pattern processing is not limited by the shape of a cup body, the large-diameter difference between the upper and lower diameters or the patterns on the surface of the special-shaped shell can be processed, the application range is wide, the integrity and the continuity of the patterns are ensured, the patterns are clear and beautiful, the deviation and the deviation are avoided, the thin-wall metal shell is ensured not to be out of round and broken, the demolding is easy, and the yield is effectively improved.
The die has the advantages that firstly, the upper die core in the upper die cavity head is designed, on one hand, when the die is closed, the upper die cavity head and the upper die core which move downwards are matched with the lower core rod to clamp the bottom of the thin-wall metal shell, so that the thin-wall metal shell with one opening end can be processed, a thin-wall metal tube with two ends being communicated can be processed, on the other hand, the upper die core can be replaced according to different cup bottom sizes, the application range is further enlarged, secondly, the clamping assembly consisting of an elastic annular clamping block, a conical block and eight supporting blocks is provided, the conical block is downwards moved by the core rod, the conical block is matched with the inclined surfaces of the supporting blocks to enable the supporting blocks to outwards prop the opening of the thin-wall metal shell, the supporting blocks to be provided with eight equal parts, the clamping force is more uniform, the thin-wall metal shell is prevented from deforming, the conical block is contracted under the elastic restoring force of the elastic annular clamping block, the conical block is upwards moved upwards to be reset, the demoulding is easier, the lower core rod is fixedly connected with the upper die cavity and the lower die cavity according to different cup bottom sizes, the lower die cavity is fixedly connected with the lower die cavity head, when the conical block is downwards moved downwards, the conical block is matched with the inclined surfaces of the conical block, the conical block is more evenly and the conical block is matched with the lower die cavity, the conical block is more evenly moves towards the lower die cavity, the lower die cavity is more easily and the die cavity is more smooth, the die cavity is more attractive, the die cavity is more smooth, the die cavity is more has the machining precision is better, and the die cavity is more smooth and the die cavity is easier and has the machining precision and has the processing precision and has the die cavity and more smooth and has the processing precision and better processing precision.
Drawings
FIG. 1 is a schematic diagram of the structure of a whole body pattern forming die of a thin-wall metal shell of the invention;
FIG. 2 is an exploded perspective view of the thin-walled metal shell full body pattern forming mold of the present invention;
FIG. 3 is a schematic top view of the buckle on the half;
fig. 4 is a schematic perspective view of the haffling lower buckle;
FIG. 5 is a schematic cross-sectional structural view of a stay block;
FIG. 6 is a schematic diagram of the structure of the invention in the open state when the thin-walled metal shell whole body pattern forming mold is used for processing;
fig. 7 is a schematic view of a structure of the present invention in a state of mold clamping and water non-feeding when the thin-walled metal shell whole body pattern forming mold is used for processing.
Detailed Description
In order to make the technical scheme of the invention clearer, the invention is described in detail below with reference to the accompanying drawings 1-7. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
A whole body pattern forming die for a thin-wall metal shell comprises an upper die assembly 100, a lower die cavity assembly 200, a lower die inner die assembly and a lower die unloading assembly 300.
The upper die assembly 100 comprises an upper die plate 1, an upper die cavity head 2, an upper die core 3 and a half sleeve 4, wherein the upper die cavity head 2 is fixedly connected to the upper die plate 1, the half sleeve 4 is fixedly connected to the upper die cavity head 2, the upper die core 3 is fixed between the upper die plate 1 and the upper die cavity head 2 through a T-shaped groove, a core rod 11 is pressed down when the upper die core 3 is clamped, and an inclined surface is arranged on the inner wall of the half sleeve 4.
The lower model cavity assembly 200 comprises a lower model cavity head 7, a cavity 5, an upper half buckle 8, a lower half buckle 9 and a positioning block 6, wherein the lower model cavity head 7 is fixedly connected to a lower template 10, the number of the cavity 5 is at least three, in the embodiment, four equally divided cavities are taken as an example, the four cavities 5 are radially movable and are circumferentially uniformly distributed on the lower model cavity head 7, an inclined plane matched with the inner wall of the half sleeve 4 is arranged on the outer surface of the cavity 5, a machined pattern is arranged on the inner surface of the cavity 5, the pattern can be a concave pattern or a convex pattern, the split line of the cavity 5 avoids the pattern, the split line of the cavity is divided according to the pattern, the number of the upper half buckles 8 is at least three and are respectively fixedly connected with the cavity 5, the number of the upper half buckles 8 is equal to the number of the cavities 5, each cavity 5 corresponds to one upper half buckle 8, namely the upper half buckle 8 in the embodiment is evenly divided equally circumferentially, the lower half buckle 9 is fixedly connected with the lower model cavity head 7, the lower half buckle 9 is provided with the lower half buckle 4, the machined pattern can be a convex pattern, the split line of the cavity 6 is provided with the positioning block 6, and the four radially movable upper half buckles 6 are respectively arranged on the lower half buckle 6, and the positioning block 6 is respectively matched with the positioning block 6.
The lower die inner die assembly comprises a lower core rod 11, a lower core 15 and a clamping assembly, wherein the lower core rod 11 is arranged in a lower die cavity head 7, the lower core 15 is sleeved on the lower portion of the lower core rod 11, the lower core 15 is arranged between the lower die cavity head 7 and the lower core rod 11, the clamping assembly is arranged between the lower die cavity head 7 and the lower core rod 11 and is positioned on a ring groove formed between the lower core rod 11 and the lower core 15, a water inlet channel 16 is formed in the lower core rod 11, the upper portion of the lower core rod 11 is positioned in a processing cavity surrounded by the lower die cavity head 7, the upper die core 3 and the die cavity 5 during die assembly, the clamping assembly comprises eight supporting blocks 13, elastic pieces, clamping blocks 14 and conical blocks 12, the supporting blocks 13 are equally divided in the circumferential direction, the eight supporting blocks 13 are evenly distributed on the lower core rod 11 in the circumferential direction and all move in the radial direction, the elastic pieces provide elastic restoring force for the supporting blocks 13, the elastic annular clamping blocks 14 sleeved on the supporting blocks 13 are sleeved on the supporting blocks 13, namely the elastic annular clamping blocks 14 are sleeved on the supporting blocks 13, the inner sides of the supporting blocks 13 are sleeved on the conical blocks 12, and the conical blocks 12 are sleeved on the inner sides of the supporting blocks 12, and the conical blocks 12 are matched with the conical blocks 13.
The lower die unloading assembly 300 comprises four fixing plates 17, unloading springs 18 and guide blocks 19, wherein one fixing plate 17 is arranged at each half upper buckle 8, the lower parts of the four fixing plates 17 are inserted into the lower die plate 10, the fixing plates 17 are connected with the half upper buckles 8 through bolts, the unloading springs 18 are sleeved on the bolts, the unloading springs 18 are positioned on the outer sides of the fixing plates 17, one end of each guide block 19 is movably inserted into a middle through hole of the fixing plate 17, the other end of each guide block 19 is fixedly connected with the half upper buckle 8 through a dovetail groove, a thin-wall metal shell opening to be processed is arranged between a supporting block 13 of a clamping assembly and a lower die cavity head 7, when the upper die assembly 100 is pressed down, the half sleeve 4 is matched with the die cavity 5 through an inclined plane to enable the die cavity 5 to be folded inwards in a radial direction, the upper die core 3 is pressed down, the lower core rod 11 is pressed down to be a cone block 12, the supporting block 13 is pressed down outwards under the action of the inclined plane of the cone block 12 and the supporting block 13, the upper die core 3 and the bottom of the upper die cavity head 2 are fixed through a middle through a dovetail groove, the thin-wall metal shell opening is clamped outwards, the thin-wall metal shell opening is pressed down by the supporting block 13, and the water is pressed down into the whole body through the high pressure channel, and the water is pressed down by the die cavity 11 until the whole surface of the water is completely pressed into the die cavity to be completely and the water cavity to be completely pressed into a water cavity, and the water cavity is completely, and the water cavity a water cavity is completely, and the water is completely filled.
A processing technology of using the whole body pattern forming die of the thin-wall metal shell comprises the following steps:
Step 1, a metal disc is taken, the metal disc is stretched to form a thin-wall metal shell, the opening of the thin-wall metal shell is processed to be smooth, a thin-wall metal shell with one end open is formed, or a thin-wall metal round tube is taken, the opening of the two ends of the thin-wall metal round tube is processed to be smooth, and the thin-wall metal shell with two ends open is formed;
step 2, annealing the thin-wall metal shell, so that the hardness of the material is reduced, the processed pattern is easier, and the processed pattern is more attractive;
step 3, polishing the outer surface of the thin-wall metal shell;
Step 4, inversely placing the polished thin-wall metal shell into a die to carry out whole-body pattern processing;
A. In the die opening-die opening state, the polished thin-wall metal shell is inversely sleeved in the lower core rod 11, the opening is arranged between the supporting block 13 and the lower die cavity head 7, downward force is applied to the upper die plate 1 by using pressure equipment, the upper die assembly 100 moves downwards, the inclined inner wall of the downward-moving half sleeve 4 is in sliding fit with the inclined inner wall of the downward-moving half sleeve, the die cavity 5 is driven to move inwards in the radial direction by the inclined surface of the die cavity 5, the downward-moving upper die cavity head 2 and the upper die core 3 are matched with the lower core rod 11 to clamp the bottom of the thin-wall metal shell, the upper die core 3 is pressed down to drive the lower core rod 11 to move downwards, the lower core rod 11 drives the cone block 12 to move downwards, the downward-moving cone block 12 drives the supporting block 13 to move outwards in the radial direction by the inclined surface matched with the supporting block 13 so as to clamp the opening of the thin-wall metal shell, and die closing is completed;
B. The water expansion forming-starting water expansion equipment, wherein high-pressure water enters from the water inlet channels 16 of the lower template 10 and the lower core rod 11, and the thin-wall metal shell is outwards expanded to be closely attached to the cavity under the action of water pressure until the surface pattern is formed;
C. After demoulding-pattern processing is completed, the pressure equipment drives the upper die assembly 100 to move upwards, the die cavity 5 is opened outwards under the action of the elasticity of the unloading spring 18, the supporting blocks 13 shrink inwards under the action of the elasticity of the elastic annular clamping blocks 14, the inward-shrinking supporting blocks 13 drive the cone blocks 12 to move upwards through inclined planes matched with the inward-shrinking supporting blocks, the lower core rod 11 is driven to move upwards, the clamping part of the opening of the thin-wall metal shell is loosened, the thin-wall metal shell is taken out, and demoulding is completed.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110643684.7A CN113352808B (en) | 2021-06-09 | 2021-06-09 | Thin-walled metal shell full-body pattern forming mold and processing technology using the mold |
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| CN202110643684.7A CN113352808B (en) | 2021-06-09 | 2021-06-09 | Thin-walled metal shell full-body pattern forming mold and processing technology using the mold |
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| CN113352808A CN113352808A (en) | 2021-09-07 |
| CN113352808B true CN113352808B (en) | 2024-12-31 |
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| CN116729011A (en) * | 2023-07-14 | 2023-09-12 | 上海万盛保温容器有限公司 | Full-plate pattern punching equipment for metal shell of calabash-shaped heat-preserving container and manufacturing process |
| CN117483536A (en) * | 2023-11-10 | 2024-02-02 | 浙江安胜科技股份有限公司 | A traceless hydraulic forming device and forming process for special-shaped vacuum vessels |
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| CN210253761U (en) * | 2019-07-03 | 2020-04-07 | 凌卫东 | Liquid bulging die |
| CN111391555A (en) * | 2020-03-23 | 2020-07-10 | 浙江哈尔斯真空器皿股份有限公司 | Metal water cup shell with continuous pressed patterns on surface and manufacturing method thereof |
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