CN110394611B - Small-pressure die transformation process - Google Patents
Small-pressure die transformation process Download PDFInfo
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- CN110394611B CN110394611B CN201910665484.4A CN201910665484A CN110394611B CN 110394611 B CN110394611 B CN 110394611B CN 201910665484 A CN201910665484 A CN 201910665484A CN 110394611 B CN110394611 B CN 110394611B
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- die
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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
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
- B30B15/026—Mounting of dies, platens or press rams
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
The invention relates to the field of dies, in particular to a small-pressure die transformation process, which comprises the steps of 1) machining a cutter, 2) machining a lower spherical surface part, 4) machining an upper spherical surface part and 5) installing a die, wherein the surface of an upper die and a lower die is transformed into a micro-spherical arc surface shape, patterns and characters are carved on a micro-arc surface in a projection carving mode, 1, a blank noble metal material with the thickness of less than 1.5mm is better molded, and the pressed patterns of a product are fuller and the handwriting is clear; 2. the pressure tonnage required by a pressed product is reduced, the service life of the die is effectively prolonged, the risk factors such as die cracking and the like are reduced, and the safety production is guaranteed; 3. the pressing times are reduced, and the production efficiency of the pressing link is improved.
Description
Technical Field
The invention relates to the field of dies, in particular to a small-pressure die transformation process.
Background
The gold coin is produced by pressing the upper and lower dies with an oil press to extrude the gold coin blank in the cavity to realize the formation of patterns and characters. The traditional upper die and the lower die of the die are planar, so that the metal material flowability of a small-gram-weight noble metal product blank with the thickness of less than 1.5mm is poor, and the processing defects in the following aspects exist:
1. so that the situations of the incompleteness of the embossed pattern pressing on the gold coin and the underpressure of the sand surface mirror surface appear.
2. If additional pressure is added to force pattern forming, the die can be cracked or damaged, the product can also be flanged, and inconvenience is brought to later-stage finished product processing.
3. The pressing variable is large, the service life of the die is reduced, and the pressed pattern of the product is easy to cause the conditions of double images of the product outline or fuzzy writing after multiple annealing and extrusion.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a small-pressure die transformation process.
In order to achieve the purpose, the invention adopts the following technical scheme: a small-pressure die transformation process comprises the following steps:
1) machining a cutter: using 1200-mesh oilstone to manually make the tool point under a microscope to form a micro-arc surface tool point with the end surface diameter of 0.04mm, wherein the diameter D of the taper flat bed knife is 3mm, the taper alpha is 30 degrees, and the bottom diameter D is 0.04 mm;
2) machining the lower spherical part: the lower spherical part is processed by adopting a taper flat bottom cutter, an arc surface model is firstly established in the processing of the lower spherical part, characters or relief patterns are projected to an arc surface design path, the path interval is 0.01mm, the rotating speed of a main shaft in the processing process is 22000-24000 turns, and the feeding is controlled: 0.6 m/min, knife-down control: 0.2mm tangential feed, coolant: no. 5 industrial white oil, path layering mode: one layer of 0.03mm, if the font is 0.2mm high, 7 layers of layers are carved layer by layer, the upper surface of the lower spherical part is arc-shaped, and the height of the arc surface of the lower spherical part is 0.1 mm-0.3 mm;
3) processing the upper spherical part: the upper spherical part is processed by adopting a taper flat bottom cutter, an arc surface model is firstly established in the processing of the upper spherical part, characters or relief patterns are projected to an arc surface design path, the path interval is 0.01mm, the rotating speed of a main shaft is 22000-24000 turns in the processing process, and the feeding is controlled: 0.6 m/min, knife-down control: 0.2mm tangential feed, coolant: no. 5 industrial white oil, path layering mode: one layer of 0.03mm, if the font is 0.2mm high, 7 layers of layers are carved layer by layer, the lower surface of the upper spherical part is arc-shaped, and the height of the arc surface of the upper spherical part is 0.1 mm-0.3 mm;
4) mounting the die, namely fixing a lining plate at the lower part of a press machine body, fixing a lower die at the middle position of the upper part of the lining plate, arranging a lower spherical surface part on the end surface of the upper part of the lower die, fixing an upper lining plate at the upper part of the press machine body, fixing an upper die at the middle position of the upper lining plate, and arranging an upper spherical surface part on the end surface of the lower part of the; pressing and molding the pressing blank in the cavity assembly; the die cavity assembly comprises a die cavity die, a die cavity groove and a pressing cavity, the die cavity die is circular, the die cavity die is made of metal and has the hardness of 55-62, the die cavity groove is arranged in the middle of the die cavity die in a penetrating manner, the central axis of the die cavity groove corresponds to the central axis of an upper die and the central axis of a lower die, the upper die and the lower die can enter the die cavity groove, the upper end surface of the lower die is arranged in the die cavity groove, the upper die can move into the die cavity groove, the pressing cavity is formed among the die cavity groove, the upper part of the lower die and the lower part of the upper die;
an explosion-proof ring is fixed outside the cavity die, the explosion-proof ring is annular, the cavity die is sleeved in the explosion-proof ring, the hardness of the explosion-proof ring is 45-50, the explosion-proof ring is fixedly connected with the cavity die, the hardness of the explosion-proof ring is less than that of the cavity die, and two sides of the explosion-proof ring are fixedly connected with the side wall of the press machine body through fixing plates;
the lower die is cylindrical, the diameter of the lower die is 15-40 mm, the upper die is cylindrical, and the diameter of the upper die is 15-40 mm.
The invention has the beneficial effects that: the invention has the advantages that the surface of the upper die and the lower die is reformed into the arc surface of the micro-sphere, patterns and characters are carved on the micro-arc surface in a projection carving mode, and the invention has the following effects:
1. the blank noble metal material with the thickness of less than 1.5mm is better molded, and the pressed pattern of the product is fuller and the handwriting is clear;
2. the pressure tonnage required by a pressed product is reduced, the service life of the die is effectively prolonged, the risk factors such as die cracking and the like are reduced, and the safety production is guaranteed;
3. the pressing times are reduced, and the production efficiency of the pressing link is improved.
Drawings
Fig. 1 is a schematic front view of the present invention.
Fig. 2 is a schematic top view of the present invention.
Fig. 3 is a schematic view of the structure of the cutter in the invention.
Fig. 4 is a schematic diagram of the structure at a in fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
The small-pressure die transformation process shown in fig. 1-4 comprises the following steps:
1) machining a cutter: using 1200-mesh oilstone to manually make the tool point under a microscope to form a micro-arc surface tool point with the end surface diameter of 0.04mm, wherein the diameter D of the taper flat bed knife is 3mm, the taper alpha is 30 degrees, and the bottom diameter D is 0.04 mm;
2) machining the lower spherical part: the lower spherical part is processed by adopting a taper flat bottom cutter, an arc surface model is firstly established in the processing of the lower spherical part, characters or relief patterns are projected to an arc surface design path, the path distance is 0.01mm, and the compact path distribution is beneficial to the smooth finish of a carving plane, so that the deformation quantity of the patterns is small and cannot be distinguished by naked eyes. The rotation speed of a main shaft is 22000-24000 revolutions in the processing process (the cutting amount of a small cutter is powerfully reduced by high rotation speed), and the feeding control is as follows: 0.6 m/min, the slow feed ensures the stability of the cutter and the flatness of the carved surface, the lower cutter is controlled: 0.2mm tangential feed, coolant: no. 5 industrial white oil, path layering mode: one layer of 0.03mm, if the font is 0.2mm high, 7 layers of layers are carved layer by layer, the arc surface processing on the premise of not influencing the visual aesthetic sense is not carried out, the upper surface of the lower spherical part is arc-shaped, and the height of the arc surface of the lower spherical part is 0.1 mm-0.3 mm; under the condition of the same pressure, the smaller the acting area is, the larger the pressure intensity is, the arc surface shape of the micro-spherical surface is reformed on the surfaces of the upper die and the lower die, and patterns and characters are carved on the micro-arc surface in a projection carving mode;
3) processing the upper spherical part: the upper spherical part is processed by adopting a taper flat bottom cutter, an arc surface model is firstly established in the processing of the upper spherical part, characters or relief patterns are projected to an arc surface design path, the path distance is 0.01mm, and the compact path distribution is beneficial to carving the smooth finish of the plane, so that the deformation quantity of the patterns is small and cannot be distinguished by naked eyes. The rotation speed of a main shaft is 22000-24000 revolutions in the processing process (the cutting amount of a small cutter is powerfully reduced by high rotation speed), and the feeding control is as follows: 0.6 m/min, the slow feed ensures the stability of the cutter and the flatness of the carved surface, the lower cutter is controlled: 0.2mm tangential feed, coolant: no. 5 industrial white oil, path layering mode: one layer of 0.03mm, if the font is 0.2mm high, 7 layers of layers are carved layer by layer, the lower surface of the upper spherical part is arc-shaped, and the height of the arc surface of the upper spherical part is 0.1 mm-0.3 mm; under the condition of the same pressure, the smaller the acting area is, the larger the pressure intensity is, the arc surface shape of the micro-spherical surface is reformed on the surfaces of the upper die and the lower die, and patterns and characters are carved on the micro-arc surface in a projection carving mode;
4) mounting the die, namely fixing a lining plate 2 at the lower part of a press machine body 1, fixing a lower die 3 at the middle position of the upper part of the lining plate 2, arranging a lower spherical surface part 31 on the end surface of the upper part of the lower die 3, fixing an upper lining plate 5 at the upper part of the press machine body 1, fixing an upper die 6 at the middle position of the upper lining plate 5, and arranging an upper spherical surface part on the end surface of the lower part of the upper; the upper die 6 and the lower die 3 are made of dc53 die special steel. The pressed blank 441 is pressed and formed in the cavity assembly;
the cavity assembly comprises a cavity die 41, a cavity groove 42 and a pressing cavity 44, wherein the cavity die 41 is circular, the cavity die 41 is made of metal and has the hardness of 55-62, the cavity groove 42 is arranged in the middle of the cavity die 41 in a penetrating manner, the cavity groove 42 is circular, rectangular or other shapes, the central axis of the cavity groove 42 is arranged corresponding to the central axis of the upper die 6 and the central axis of the lower die 3, the upper die 6 and the lower die 3 can enter the cavity groove 42, the upper end surface of the lower die 3 is arranged in the cavity groove 42, the upper die 6 can move into the cavity groove 42, the pressing cavity 44 is formed among the cavity groove 42, the upper part of the lower die 3 and the lower part of the upper die 6, a pressing blank 441 is arranged in the pressing cavity 44, an anti-explosion ring 43 is fixed outside the cavity die 41, the anti-explosion ring 43 is annular, the cavity die 41 is sleeved in the anti-explosion ring 43, the hardness of the anti-explosion ring 43 is 45-, the hardness of the explosion-proof ring 43 is smaller than that of the cavity die 41, the explosion-proof ring 43 is used for preventing the cavity die 41 from cracking and jumping out to harm personnel safety in the pressing process, two sides of the explosion-proof ring 43 are fixedly connected with the side wall of the press body 1 through the fixing plates 431, the fixing plates 431 play a role in connection and can be rectangular metal plates, the lower die 3 is cylindrical, the diameter of the lower die 3 is 15-40 mm, the upper surface of the lower spherical portion 31 is arc-shaped, the height of the arc surface of the lower spherical portion 31 is 0.1-0.3 mm, in the processing of the lower spherical portion 31, an arc surface model is firstly established, characters or embossment patterns are projected to an arc surface design path, the lower spherical portion 31 is processed by adopting a taper flat-bottomed knife, and the manufacturing core of the taper flat-bottomed knife is that the point of a sword needs to manually make the knife point under a microscope by using 1200-mesh oilstones to form a. The probability of occurrence of adverse factors such as cutter breakage during carving is reduced, the distance between the paths is 0.01mm, and the dense path distribution is beneficial to smooth finish of the carving plane, so that the deformation of the pattern is small and cannot be distinguished by naked eyes. The rotation speed of a main shaft is 22000-24000 revolutions in the processing process (the cutting amount of a small cutter is powerfully reduced by high rotation speed), and the feeding control is as follows: the slow feeding of 0.6 m/min ensures the stability of the cutter and the flatness of the carved surface, and the cutter feeding control: 0.2mm tangential feed, coolant: no. 5 industrial white oil, path layering mode: the method comprises the following steps of carving a layer of 0.03mm, carving 7 layers by layer if a font is 0.2mm high, machining an arc surface on the premise of not influencing visual aesthetics, wherein an upper die 6 is cylindrical, the diameter of the upper die 6 is 15-40 mm, the upper surface of an upper spherical part is arc-shaped, the height of the arc surface of the upper spherical part is 0.1-0.3 mm, in the machining of the upper spherical part, an arc surface model is established firstly, characters or relief patterns are projected to an arc surface design path, the upper spherical part is machined by adopting a taper flat bed knife, the diameter D of the taper flat bed knife is 3mm, the taper alpha is 30 degrees, the bottom diameter D is 0.04mm, and the manufacturing core of the taper flat bed knife is that the point of a sword needs to make the knife point manually by using 1200 meshes of oilstone under a microscope to form a micro arc surface knife point with the end surface diameter of. So as to reduce the probability of occurrence of adverse factors such as knife breaking during carving. The distance between the paths is 0.01mm, and the dense path distribution is beneficial to the smooth finish of the carving plane, so that the deformation of the pattern is small and cannot be distinguished by naked eyes. The rotation speed of a main shaft is 22000-24000 revolutions in the processing process (the cutting amount of a small cutter is powerfully reduced by high rotation speed), and the feeding control is as follows: the slow feeding of 0.6 m/min ensures the stability of the cutter and the flatness of the carved surface, and the cutter feeding control: 0.2mm tangential feed, coolant: no. 5 industrial white oil path layering mode: one layer with the thickness of 0.03mm, and 7 layers of layers are carved layer by layer if the font is 0.2mm high.
And (3) data comparison:
take a 30mm diameter 20g gold medal (0.4 mm relief height) as an example:
the traditional pressing scheme is as follows:
oil pressure frequency: 5 times (twice)
The pressure of the press is as follows: 60-80 tons
Service life of the die: 2000 times
After improvement:
oil pressure frequency: 2 times (one time)
The pressure of the press is as follows: 30 ton of
Service life of the die: 6000 times
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (1)
1. A small-pressure die transformation process is characterized by comprising the following steps:
1) machining a cutter: using 1200-mesh oilstone to manually make the tool point under a microscope to form a micro-arc surface tool point with the end surface diameter of 0.04mm, wherein the diameter D of the taper flat bed knife is 3mm, the taper alpha is 30 degrees, and the bottom diameter D is 0.04 mm;
2) machining the lower spherical part: the lower spherical part is processed by adopting a taper flat bottom cutter, an arc surface model is firstly established in the processing of the lower spherical part, characters or relief patterns are projected to an arc surface design path, the path interval is 0.01mm, the rotating speed of a main shaft in the processing process is 22000-24000 turns, and the feeding is controlled: 0.6 m/min, knife-down control: 0.2mm tangential feed, coolant: no. 5 industrial white oil, path layering mode: one layer of 0.03mm, if the font is 0.2mm high, 7 layers of layers are carved layer by layer, the upper surface of the lower spherical part is arc-shaped, and the height of the arc surface of the lower spherical part is 0.1 mm-0.3 mm;
3) processing the upper spherical part: the upper spherical part is processed by adopting a taper flat bottom cutter, an arc surface model is firstly established in the processing of the upper spherical part, characters or relief patterns are projected to an arc surface design path, the path interval is 0.01mm, the rotating speed of a main shaft is 22000-24000 turns in the processing process, and the feeding is controlled: 0.6 m/min, knife-down control: 0.2mm tangential feed, coolant: no. 5 industrial white oil, path layering mode: one layer of 0.03mm, if the font is 0.2mm high, 7 layers of layers are carved layer by layer, the lower surface of the upper spherical part is arc-shaped, and the height of the arc surface of the upper spherical part is 0.1 mm-0.3 mm;
4) mounting the die, namely fixing a lining plate at the lower part of a press machine body, fixing a lower die at the middle position of the upper part of the lining plate, arranging a lower spherical surface part on the end surface of the upper part of the lower die, fixing an upper lining plate at the upper part of the press machine body, fixing an upper die at the middle position of the upper lining plate, and arranging an upper spherical surface part on the end surface of the lower part of the; pressing and molding the pressing blank in the cavity assembly;
the die cavity assembly comprises a die cavity die, a die cavity groove and a pressing cavity, the die cavity die is circular, the die cavity die is made of metal and has the hardness of 55-62, the die cavity groove is arranged in the middle of the die cavity die in a penetrating manner, the central axis of the die cavity groove corresponds to the central axis of an upper die and the central axis of a lower die, the upper die and the lower die can enter the die cavity groove, the upper end surface of the lower die is arranged in the die cavity groove, the upper die can move into the die cavity groove, the pressing cavity is formed among the die cavity groove, the upper part of the lower die and the lower part of the upper die;
an explosion-proof ring is fixed outside the cavity die, the explosion-proof ring is annular, the cavity die is sleeved in the explosion-proof ring, the hardness of the explosion-proof ring is 45-50, the explosion-proof ring is fixedly connected with the cavity die, the hardness of the explosion-proof ring is less than that of the cavity die, and two sides of the explosion-proof ring are fixedly connected with the side wall of the press machine body through fixing plates;
the lower die is cylindrical, the diameter of the lower die is 15-40 mm, the upper die is cylindrical, and the diameter of the upper die is 15-40 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910665484.4A CN110394611B (en) | 2019-07-23 | 2019-07-23 | Small-pressure die transformation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910665484.4A CN110394611B (en) | 2019-07-23 | 2019-07-23 | Small-pressure die transformation process |
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| Publication Number | Publication Date |
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| CN110394611A CN110394611A (en) | 2019-11-01 |
| CN110394611B true CN110394611B (en) | 2021-03-23 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2159837Y (en) * | 1993-04-15 | 1994-03-30 | 阎金英 | Noble metal shaping machine |
| CN1219663C (en) * | 2001-03-09 | 2005-09-21 | 沈阳造币厂 | Large gold coin with high figure relief and its mold making process |
| DE102008053081B4 (en) * | 2008-10-24 | 2018-12-27 | Bayerische Motoren Werke Aktiengesellschaft | Method for designing a tool |
| CN102431372B (en) * | 2010-09-29 | 2013-05-29 | 沈阳造币有限公司 | Manufacture process of bowl-shaped noble metal products and mold for manufacture process |
| CN108480926B (en) * | 2018-03-28 | 2019-06-21 | 深圳市帕玛精品制造有限公司 | Gold coin manufacturing process, gold coin and clock and watch |
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