CN111822535B - Manufacturing method of lightweight metal belt - Google Patents
Manufacturing method of lightweight metal belt Download PDFInfo
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- CN111822535B CN111822535B CN202010655493.8A CN202010655493A CN111822535B CN 111822535 B CN111822535 B CN 111822535B CN 202010655493 A CN202010655493 A CN 202010655493A CN 111822535 B CN111822535 B CN 111822535B
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- Prior art keywords
- strip plate
- blank
- watchband
- hot forging
- strip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/14—Making other products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/025—Closed die forging
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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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Abstract
The invention provides a manufacturing method of a lightweight metal strip, which comprises the following steps: s10, punching and blanking the steel strip to obtain an upper strip plate blank and a lower strip plate blank; s20, forming a lower strip plate groove on the lower strip plate blank through cold extrusion to obtain a lower strip plate; s30, placing the upper strip plate blank in a notch of the lower strip plate groove, and hot forging the upper strip plate blank and the lower strip plate at 800-1150 ℃ to compound the upper strip plate blank and the lower strip plate to obtain a hollow metal strip blank; and S40, finishing the hollow metal strip blank to obtain the lightweight metal strip. According to the manufacturing method of the light metal band, the stainless steel watchband with the hollow interior is prepared by adopting the processes of cold extrusion, hot forging and finish machining, the advantage of low cost of the stainless steel watchband is kept, the characteristic of light weight of the titanium alloy watchband is achieved, the industrial development of the metal watchband can be promoted, and the production cost of the watch is greatly reduced.
Description
Technical Field
The invention relates to the technical field of watchband manufacturing, in particular to a manufacturing method of a lightweight metal band.
Background
The stainless steel metal watchband has the advantages of corrosion resistance, good metal luster, high strength and hardness, low material and processing cost and the like, but the weight of the prior watchband is generally heavier due to the fact that most of the prior watchbands are solid watchbands. For this reason, in order to reduce the weight of the wristband, titanium alloy wristband is also used, which has good corrosion resistance, better affinity with human skin, and lighter weight than stainless steel, but the material price and manufacturing cost are much higher than those of stainless steel wristband.
Therefore, if stainless steel materials with low cost can be used, the manufacturing method is equivalent to the manufacturing method of titanium alloy (with the same size specification) in quality, but the total cost is larger than that of the manufacturing method of the titanium alloy watchband, and the manufacturing method has larger technical and economic values.
Disclosure of Invention
In order to solve the problems, the invention provides a manufacturing method of a lightweight metal band, which is characterized in that a stainless steel watchband with a hollow interior is prepared by adopting cold extrusion, hot forging and finish machining processes, so that the advantage of low cost of the stainless steel watchband is kept, the characteristic of light weight of a titanium alloy watchband is achieved, the industrial development of the metal watchband can be promoted, and the production cost of the watch is greatly reduced.
In order to achieve the above purpose, the invention adopts a technical scheme that:
a method for manufacturing a lightweight metal strip, comprising the steps of: s10, punching and blanking the steel strip to obtain an upper strip plate blank and a lower strip plate blank; s20, forming a lower strip plate groove on the lower strip plate blank through cold extrusion to obtain a lower strip plate; s30, placing the upper strip plate blank in a notch of the lower strip plate groove, and hot forging the upper strip plate blank and the lower strip plate at 800-1150 ℃ to compound the upper strip plate blank and the lower strip plate to obtain a hollow metal strip blank; and S40, finishing the hollow metal strip blank to obtain the lightweight metal strip.
Further, the hot forging process comprises a first hot forging step and a second hot forging step, wherein the first hot forging step is that an upper forging die is lowered at the speed of 6mm/s, the forging pressure is 1000N, and the pressure is maintained for 15 s; and the second hot forging step is positioned after the first hot forging step, the upper forging die is lifted and then is lowered at the speed of 200mm/s, and the forging pressure is 1900N.
Further, the step S30 further comprises annealing treatment, wherein the annealing treatment is carried out after the hot forging, the annealing temperature is 1050-1070 ℃, and the heat preservation time is 1-2 min/mm.
Further, the step S40 includes the following steps of cutting off the flash, numerically milling the outer surface, drilling pin holes, and polishing the outer surface.
Further, the section of the lower strip plate groove in the vertical plane is trapezoidal.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the manufacturing method of the light metal band, the stainless steel watchband with the hollow interior is prepared by adopting the processes of cold extrusion, hot forging and finish machining, the advantage of low cost of the stainless steel watchband is kept, the characteristic of light weight of the titanium alloy watchband is achieved, the industrial development of the metal watchband can be promoted, and the production cost of the watch is greatly reduced.
Drawings
The technical solution and the advantages of the present invention will be apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method of manufacturing a lightweight metal strip according to an embodiment of the present invention;
FIGS. 2-10 illustrate a manufacturing process according to one embodiment of the present invention;
FIG. 11 is a general cloud of variations of a hollow watchband in accordance with an embodiment of the invention;
FIG. 12 is a general deformation cloud of a solid watchband in accordance with an embodiment of the invention;
fig. 13 is a view showing a structure of a light metal strip in actual size according to an embodiment of the present invention.
Reference numbers in the figures:
1 upper band plate blank, 2 lower band plate, 21 lower band plate groove, 22 lower band plate blank, 3 lightweight metal band, 31 hollow metal band blank, 41 male die, 42 extrusion female die, 43 knockout rod, 51 upper forging die, 52 lower forging die, 6 flash, 71 milling cutter and 72 drill bit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present embodiment provides a method for manufacturing a lightweight metal strip, as shown in fig. 1, including the steps of: s10 steel strip punching blanking is carried out to obtain an upper strip plate blank 1 and a lower strip plate blank 22. S20 cold pressing the lower strip plate blank 22 to form a lower strip plate groove 21, and the lower strip plate groove 21 is formed to obtain the lower strip plate 2. S30, placing the upper band plate blank 1 in the notch of the lower band plate groove 21, and hot forging the upper band plate blank 1 and the lower band plate 2 at 800-1150 ℃ to compound the upper band plate blank 1 and the lower band plate 2 to obtain the hollow metal band blank 31. S40 finish-machining the hollow metal strip blank 31 to obtain the lightweight metal strip 3.
In step S30, the hot forging process includes a first hot forging step and a second hot forging step, where the first hot forging step is to lower the upper forging die 51 at a speed of 6mm/S, the forging pressure is 1000N, and the pressure is maintained for 15S, so that the upper band blank 1 and the lower band 2 are pressed together. The second hot forging step is performed after the first hot forging step, the upper forging die 51 is raised and then lowered at a speed of 200mm/s, and the forging pressure is 1900N. After the hot forging is finished, annealing heat treatment is carried out, wherein the annealing temperature is 1050-. Because of pressing at the forging temperature, the upper and lower belt plate bodies are completely combined into a whole.
The step S40 sequentially comprises the following steps of cutting off flash, numerically milling the outer surface, drilling pin holes and polishing the outer surface. As shown in fig. 2, the step S10 obtains the upper strip plate blank 1 and the lower strip plate blank 22 by using a steel strip. As shown in fig. 3 to 6, the hollow metal strip blank 31 is obtained through the step S30. The part of the male die 41, which is in contact with the lower strip plate blank 22, is provided with an inclined plane of 0.8-1.2 degrees, so that the section of the lower strip plate groove 21 in the vertical plane is trapezoidal, the demolding after extrusion is facilitated, and the formation of a cavity is not influenced. As shown in fig. 7 to 10, the lightweight metal strip 3 is obtained through the step S40.
Comparison of deformation before and after weight reduction:
as shown in fig. 11, based on the finite element mechanics and strength analysis, under the same stress condition (1 Mpa force is applied to the watch band), the maximum deformation of the initial solid stainless steel watch band is 0.17um, and the maximum deformation of the optimized hollow watch band is 0.6 um. It can be seen that the deformation amount is increased by only 0.43um, which is very small and negligible, on the premise of 47% mass reduction, and therefore, the use is not affected.
Comparison of stress values before and after lightening:
the maximum von-mises stress value of the initially solid stainless steel watchband is 1.173MPa, and the maximum von-mises stress value of the optimized hollow watchband is 2.712 MPa. It can be seen that the stress value is increased by only 1.539Mpa and is much less than the yield limit of the material.
In conclusion, under the condition of meeting the requirement of weight reduction, the strength and the rigidity of the hollow watchband meet the requirement. The surface hardness, corrosion resistance, gloss and the like are not changed from the original solid surface section, and the use requirements are met.
The stainless steel watchband generally adopts 316 stainless steel, belongs to austenitic stainless steel, and the physical and mechanical properties thereof are shown in the following table 1. The market price of the material is about 20 Yuan/Kg.
TABLE 1.316 Austenitic stainless Steel physical and mechanical Properties
Titanium alloy watchbands, which are made of a special alloy formulation, for a certain strength and hardness, are known as super titanium, such as Nippon Siberian watch bands, which have a density of 4.51g/cm3About 60% of steel, but the material cost is high, about 200 yuan/Kg, and the processing cost is much higher than that of stainless steel, about 2 times of that of stainless steel.
The watchband generally has about 13 sections, the size of the watchband connecting the watch and the watchband buckle part is slightly different from that of the watchband at the middle part, and the middle hollow watchband part designed by the invention is shown in figure 13 (single section). The watchbands with different brands and different specifications are different in size, the specification which is the most common and applied is shown in figure 13, and the method is also suitable for manufacturing the watchbands with different specifications. According to the actual size of the watch, the watchband is made to be hollow inside, the total thickness of the watchband is 2.4mm, and the wall thickness of the hollow part is 0.5 mm. The quality before and after the modification was evaluated in the three-dimensional design software. The volume of the original solid watchband is 608.579mm3, the mass is 4.777g, the volume of the designed hollow watchband is 325.285mm3, the mass is 2.553g, the weight is reduced by 2.224g, and the weight reduction ratio (4.777-2.553)/4.777 is 47%.
The cost price of the stainless steel band was calculated to be 4.777 × 0.02 — 0.096-membered and the cost price of the titanium alloy processed material was calculated to be 608.579 × 0.00451 × 0.2 — 2.745 — 0.549-membered, by referring to the unit prices of the stainless steel and the titanium alloy and assuming the same specifications. If the watch band is made into a hollow case, the wall thickness is 0.5mm and the material cost 2.553 x 0.02 of the stainless steel watch band is 0.051 yuan on the basis of ensuring certain strength, hardness and manufacturing process.
Regarding the manufacturing cost of the titanium alloy watchband and the hollow stainless steel watchband, the processing procedure is considered, the titanium alloy watchband and the hollow stainless steel watchband are subjected to forging, numerical control processing, drilling and polishing, and the hollow stainless steel watchband is subjected to one more cold extrusion process. However, in actual production, the machining of titanium alloys is much more complicated than the machining process of stainless steel. To sum up, the manufacturing cost of the stainless steel watchband and the titanium alloy watchband is approximately equal, related data are consulted, and the manufacturing cost of the stainless steel watchband and the titanium alloy watchband is 1: about 1.2. Price lists were produced for the three watchbands in single link as shown in table 2.
TABLE 2 price list for single-section three kinds of watchbands
Under the condition that weight is less than titanium alloy (weight of hollow stainless steel watchband is 2.553g, and weight of titanium alloy watchband is 2.745g, has reduced 0.192g), manufacturing cost is about 1 for the hollow stainless steel watchband of this application: 1.2. thus, the ratio of the total production cost (material cost + manufacturing cost) of the hollow stainless steel wristband to the titanium alloy wristband of the present application is about 1: 6, 1/6 which is lower in weight than the titanium alloy and only has the price of the titanium alloy watchband is realized, and the stainless steel watchband meets the use requirement.
The above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are transformed by the content of the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A method for manufacturing a lightweight metal strip, characterized by comprising the steps of: s10, punching and blanking the steel strip to obtain an upper strip plate blank and a lower strip plate blank; s20, forming a lower strip plate groove on the lower strip plate blank through cold extrusion to obtain a lower strip plate; s30, placing the upper strip plate blank in a notch of the lower strip plate groove, and hot forging the upper strip plate blank and the lower strip plate at 800-1150 ℃ to compound the upper strip plate blank and the lower strip plate to obtain a hollow metal strip blank; s40, performing finish machining on the hollow metal strip blank to obtain a lightweight metal strip;
the hot forging process comprises a first hot forging step and a second hot forging step, wherein the first hot forging step is that an upper forging die is lowered at the speed of 6mm/s, the forging pressure is 1000N, and the pressure is maintained for 15 s; and the second hot forging step is positioned after the first hot forging step, the upper forging die is lifted and then is lowered at the speed of 200mm/s, and the forging pressure is 1900N.
2. The method of claim 1, wherein the step S30 further comprises an annealing step at 1050-1070 ℃ for 1-2min/mm after the hot forging.
3. The method of claim 1, wherein the step S40 includes the steps of trimming, numerically milling the outer surface, drilling pin holes, and polishing the outer surface.
4. The method of claim 1 wherein the lower band plate groove has a trapezoidal cross-section in a vertical plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010655493.8A CN111822535B (en) | 2020-07-09 | 2020-07-09 | Manufacturing method of lightweight metal belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010655493.8A CN111822535B (en) | 2020-07-09 | 2020-07-09 | Manufacturing method of lightweight metal belt |
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| Publication Number | Publication Date |
|---|---|
| CN111822535A CN111822535A (en) | 2020-10-27 |
| CN111822535B true CN111822535B (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010655493.8A Active CN111822535B (en) | 2020-07-09 | 2020-07-09 | Manufacturing method of lightweight metal belt |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1057803A (en) * | 1990-06-28 | 1992-01-15 | 林森义 | The method for making of stainless steel watch straps |
| CN2100121U (en) * | 1991-07-03 | 1992-04-01 | 林森义 | Link construction of metal wrist-watch strap |
| FR2738122B1 (en) * | 1995-09-01 | 1997-10-17 | Meca Control | LIGHT LINK FOR PRECIOUS METAL ARTICULATED BRACELET |
| FR2746267B1 (en) * | 1996-03-19 | 1998-06-12 | Meca Control | PRECIOUS METAL SILVERWATCH WATCH BRACELET |
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