CN108273919B - Stamping die of gas mark screw die and processing method thereof - Google Patents

Stamping die of gas mark screw die and processing method thereof Download PDF

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Publication number
CN108273919B
CN108273919B CN201810363434.6A CN201810363434A CN108273919B CN 108273919 B CN108273919 B CN 108273919B CN 201810363434 A CN201810363434 A CN 201810363434A CN 108273919 B CN108273919 B CN 108273919B
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stamping die
boss
hole
die
cutting
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CN108273919A (en
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杨坤
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Haiyan Hxy Mould Co ltd
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Haiyan Hxy Mould Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/10Die sets; Pillar guides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00Making other particular articles
    • B21D53/24Making other particular articles nuts or like thread-engaging members
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/24Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Forging (AREA)

Abstract

The invention discloses a stamping die of a gas mark screw die and a processing method thereof, belonging to the technical field of automobile part processing, and the technical key points are as follows: the utility model provides a vapour mark screw die's stamping die, includes the stamping die body, the one end of stamping die body is equipped with a boss to the evagination, the through-hole has been seted up downwards to the upper end central part of boss, its be equipped with the axle core in the through-hole, the axle core with interference fit between the inner wall of through-hole, the lower terminal surface of axle core with the lower terminal surface of stamping die body flushes, and its up end is located in the boss, just the high degree of depth that is less than the through-hole of axle core. The processing method comprises the steps of blanking cutting, excircle grinding, heat treatment, slow wire feeding, grinding head type, polishing and integrated forming, and the stamping die of the gas standard screw die can be obtained. The invention effectively solves the technical difficulties existing in the process of processing the stamping die, and simultaneously further improves the processing quality and efficiency of the gas standard screw die.

Description

Stamping die of gas mark screw die and processing method thereof
Technical Field
The invention belongs to the technical field of automobile part processing, and particularly relates to a stamping die of a gas mark screw die and a processing method thereof.
Background
The hexagon socket head screw is one kind of special bead of hexagon socket head screw, namely hexagon socket head screw. The inner hexagonal flower screw can be used as a gas mark screw because the inner hexagonal flower screw can be disassembled and assembled by adopting a specific screwdriver (namely a screwdriver) when being installed or disassembled, and is quite firm and durable.
The screw die can be formed by stamping with a screw grinding tool, and the current screw die has various types and types, for example, chinese practical patent application publication No. CN2794709Y discloses a composite slot screw die which can stamp and support screws suitable for various tools.
Another example is chinese practical patent application publication No. CN2794710Y, which discloses a pentagonal screw die, comprising a body, a groove is provided on the end surface of the body, a punch is protruding in the groove, and the punch is pentagonal. The pentagonal screw die utilizes the pentagonal punch in the groove of the body to punch the head of the screw to form a hole groove corresponding to the pentagonal flower-shaped punch, and the hole groove can be used for the screwdriver to extend and lock, so that the screw is easy to lock or disassemble.
Therefore, the screw die is also required to be used for manufacturing, and as the punch is arranged in the screw die and protrudes above the bottom surface of the groove, a certain technical difficulty is required to exist in processing the screw die, and the punch forming difficulty and the punch forming precision of the screw die are increased, so that a new technical scheme is required to solve the problems.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the stamping die of the gas mark screw die, which effectively solves some technical difficulties existing in the process of processing the stamping die and further improves the processing quality and efficiency of the gas mark screw die.
In order to achieve the first purpose, the invention provides the following technical scheme: the utility model provides a vapour mark screw die's stamping die, includes the stamping die body, the one end of stamping die body is equipped with a boss to the evagination, the through-hole has been seted up downwards to the upper end center part of boss, be equipped with the axle core in the through-hole, the axle core with interference fit between the inner wall of through-hole, the lower terminal surface of axle core with the lower terminal surface of stamping die body flushes, and its up end is located in the boss, just the high degree of depth that is less than the through-hole of axle core.
Through adopting above-mentioned technical scheme, offer a through-hole at stamping die's center to interference fit axle core in above-mentioned through-hole, the height of the drift of screw grinding apparatus is regulated and control through the relative height between axle core and the through-hole this moment, the effectual screw die who makes in needs the evagination to set up the drift, and this drift need be located the recess and the technological degree of difficulty that the protrusion was on the bottom surface of recess, thereby improved the quality and the efficiency of vapour mark screw die's processing.
The invention is further provided with: the stamping die body is convexly provided with an annular flange at the annular edge close to the boss.
Through adopting above-mentioned technical scheme, owing to the existence of this annular flange, can integrated into one piece have a level on the side that makes the screw die that makes this moment and above-mentioned stamping die body are mutually laminated, and simple manufacture, very useful.
The invention is further provided with: the upper end face of the boss is obliquely downwards arranged from the peripheral side to the center direction.
Through adopting above-mentioned technical scheme, the up end with the boss sets up downwards from week side to central direction slope, the drift department of the screw die of making from this can form the angle that has reverse slope, and then makes the head of vapour mark screw form with special screwdriver matched with recess, has made things convenient for the screwdriver to open above-mentioned vapour mark screw from this, has improved efficiency.
The invention is further provided with: the inner diameter of the circumferential side wall of the boss gradually increases from the upper end face to the end close to the flange, and the section of the boss is in an arc shape with a small upper part and a big lower part.
By adopting the technical scheme, the circumferential side wall of the boss is made into the arc shape with the upper part small and the lower part big, the circumferential side wall of the boss is consistent with the outer wall of the gas standard screw, and a groove with the arc-shaped section can be formed at the upper end face of the screw die during stamping. Meanwhile, on one hand, the arc-shaped boss with the small upper part and the large lower part can be conveniently stamped, so that the difficulty of groove forming is reduced, and on the other hand, when the inner wall of the groove of the screw die is stamped, the inner wall of the groove can be extruded due to the influence of the boss shape, so that the mechanical strength of the inner wall of the groove is improved, and the screw is conveniently and efficiently stamped and processed by the screw die in the later stage.
The invention is further provided with: the outside cladding of stamping die body has one deck protective layer, the protective layer is titanium alloy layer and/or high strength casting aluminum alloy layer.
By adopting the technical scheme, the titanium alloy is an alloy formed by adding other elements based on titanium element. It has excellent properties such as corrosion resistance, heat resistance, low temperature resistance, resistance to resistance, etc. The high-strength cast aluminum alloy is used for manufacturing aviation, aerospace and other mechanical components bearing large loads, and has the advantages of high strength, plasticity and toughness and strong room-temperature stretching. Therefore, the two alloys are used as protective layers, so that the mechanical strength of the die body can be improved, and the service life of the die body can be prolonged.
The invention is further provided with: and a plurality of chamfers are arranged on the inner wall of the through hole.
Through adopting above-mentioned technical scheme, be equipped with the chamfer on the inner wall of through-hole, when adopting above-mentioned boss to punch at this moment, effectively reduced the probability that the boss takes place to deform, improved above-mentioned stamping die's life.
Aiming at the defects existing in the prior art, the second aim of the invention is to provide a processing method of a stamping die of a gas standard screw die, which is convenient to operate and has higher quality of a bolt die manufactured by adopting the stamping die.
In order to achieve the second purpose, the invention provides the following technical scheme: a processing method of a stamping die of a gas mark screw die comprises the following operation steps,
step S1, blanking and cutting: cutting the metal bar into small sections on a sawing machine after surface rust removal and cleaning treatment to obtain columnar coarse materials with the size of 23 multiplied by 30 mm;
s2, grinding an outer circle: grinding the cylindrical coarse material obtained in the step S1 into an outer circle by a grinding machine;
step S3, heat treatment: quenching the cylindrical material subjected to the outer circle grinding treatment, wherein the quenching temperature is controlled to be 62-63 ℃;
step S4, slow wire feeding: carrying out internal cutting on the columnar material subjected to heat treatment on a numerical control machining machine tool, and obtaining a hexagonal through hole in the center of the columnar material;
step S5, grinding head type: grinding head type processing is carried out on one end face of the column-shaped material after the slow wire feeding processing is finished through a milling machine, and a boss and a flange are sequentially obtained through cutting;
step S6, polishing: polishing the outer surface of the columnar material obtained in the step S5;
step S7, integrated forming: and (3) knocking and integrating the columnar shaft core into the through hole through a lathe to obtain a finished product stamping die.
By adopting the technical scheme, the metal bar is cut into small sections by a sawing machine, and then the outer circle is polished, so that the overall flatness is improved; and then carrying out heat treatment, and heating the columnar material by adopting a quenching mode to greatly improve the rigidity, hardness, wear resistance, fatigue strength, toughness and the like of the surface of the columnar material. Then a through hole is cut at the central part of the columnar material by adopting the slow wire, grinding head treatment is carried out at the same time, a boss and a flange are obtained by cutting at one side of the columnar material, the approximate shape is already determined at the moment, then, the surface polishing treatment is only needed, and meanwhile, a finished product stamping die can be obtained by knocking and integrating the shaft core in the through hole, so that the stamping die is quite convenient and has higher efficiency and quality.
The invention is further provided with: in step S5, the cutting process is performed twice, the first cutting to obtain an arc-shaped boss and the second cutting to obtain a flange.
Through adopting above-mentioned technical scheme, divide twice cutting can make the first time in the in-process of cutting the processing boss, if appear unevenness in the one side that the boss lower extreme is close to with the flange, also can eliminate above-mentioned error through the cutting of secondary to its cutting efficiency and quality have further been strengthened.
Aiming at the defects existing in the prior art, the third aim of the invention is to provide a processing method of a stamping die of a gas standard screw die, which is convenient to operate and has higher quality of a bolt die manufactured by adopting the stamping die.
In order to achieve the third purpose, the invention provides the following technical scheme: a processing method of a stamping die of a gas mark screw die comprises the following operation steps,
s1, grinding an outer circle: carrying out surface rust removal and cleaning treatment on the metal bar, and then polishing on the metal bar on a grinder;
step S2, heat treatment: quenching the cylindrical material subjected to the outer circle grinding treatment, wherein the quenching temperature is controlled to be 62-63 ℃;
step S3, blanking and cutting: cutting the columnar material obtained in the step S2 into small sections on a sawing machine to obtain a material with the size of 23 multiplied by 30 mm;
step S4, slow wire feeding: carrying out internal cutting on the heat-treated material on a numerical control machining machine tool, and obtaining a hexagonal through hole in the center of the columnar material;
step S5, grinding head type: grinding head type processing is carried out on one end face of the column-shaped material after the slow wire feeding processing is finished through a milling machine, and a boss and a flange are sequentially obtained through cutting;
step S6, polishing: polishing the outer surface of the columnar material obtained in the step S5;
step S7, integrated forming: and (3) knocking and integrating the columnar shaft core into the through hole through a lathe to obtain a finished product stamping die.
By adopting the technical scheme, the surface of the metal bar is subjected to rust removal and cleaning treatment and then is subjected to excircle polishing treatment, so that the overall flatness is improved; and then carrying out heat treatment, and heating the columnar material in a quenching mode to greatly improve the rigidity, hardness, wear resistance, fatigue strength, toughness and the like of the surface of the columnar material. Then cutting into small sections, then cutting a through hole at the central part of the columnar material by adopting a slow wire, simultaneously performing grinding head type treatment, cutting one side of the columnar material to obtain a boss and a flange, wherein the approximate shape is already determined, then performing surface polishing treatment, and simultaneously knocking and integrating a shaft core into the through hole to obtain a finished stamping die. In addition, the heat treatment is firstly carried out, so that the processing technology is simple, and the heat treatment effect is good; but also further improves the processing efficiency and is very useful.
In summary, the invention has the following beneficial effects:
1. the invention effectively solves some technical difficulties existing in the process of processing the stamping die, and simultaneously further improves the processing quality and efficiency of the gas standard screw die;
2. the annular flange is arranged, so that one step can be integrally formed on one side, which is mutually attached to the stamping die body, of the manufactured screw die, and the manufacturing is convenient, simple and quite useful;
3. through setting up the chamfer, when adopting above-mentioned boss to carry out the punching press from this, effectively reduced the probability that the boss takes place deformation, improved above-mentioned stamping die's life.
Drawings
Fig. 1 is a perspective view of the present embodiment;
FIG. 2 is a schematic view of a partial structure of the present embodiment;
fig. 3 is a usage state diagram of the present embodiment in a stamping state, which is mainly used for showing a relative positional relationship between a stamping die body and a gas mark die body in a usage process;
fig. 4 is an enlarged view of a in fig. 3.
Description of the drawings: 1. a stamping die body; 2. a boss; 3. a through hole; 4. a shaft core; 5. a flange; 6. a protective layer; 7. chamfering; 8. a screw die; 9. a groove; 10. a punch; 11. a step.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
Example 1: the stamping die of the gas mark screw die, as shown in figure 1, comprises a stamping die body 1, wherein one end of the stamping die body 1 is outwards protruded with a boss 2, and the center part of the upper end of the boss 2 is downwards provided with a plum blossom-shaped through hole 3. As shown in fig. 2, a cylindrical shaft core 4 is inserted into the through hole 3, wherein the shaft core 4 is in interference fit with the inner wall of the through hole 3, the lower end surface of the shaft core 4 is flush with the lower end surface of the stamping die body 1, the upper end surface of the shaft core is positioned in the boss 2, and the height of the shaft core 4 is smaller than the depth of the through hole 3. With reference to fig. 4, the technical difficulty that the punch 10 needs to be arranged in the manufactured screw die 8 in a protruding manner and the punch 10 needs to be located in the groove 9 and protrudes above the bottom surface of the groove 9 is effectively solved, and therefore the quality and efficiency of processing of the screw die 8 are improved.
In order to further reduce the working difficulty, as shown in fig. 1, an annular flange 5 is formed on the stamping die body 1 at the position close to the annular edge of the boss 2 in a protruding manner, and in combination with fig. 4, a step 11 can be formed on one side of the screw die 8, which is mutually attached to the stamping die body 1, and the manufacturing is convenient, simple and very useful.
In order to facilitate the screw driver to open the gas cap screw, as shown in fig. 3 and 4, the upper end surface of the boss 2 is disposed obliquely downward from the circumferential side to the center direction. The punch 10 of the screw die 8 can form an angle with reverse inclination, so that the head of the gas mark screw forms a groove 9 matched with a special screw driver, the screw driver is convenient to open the gas mark screw, and the efficiency is improved.
In order to improve the mechanical strength of the inner wall of the recess 9, as shown in fig. 3 and 4, the inner diameter of the circumferential side wall of the boss 2 gradually increases from the upper end surface to the end near the flange 5, and the cross section thereof is in the shape of an arc with a small upper part and a large lower part. The circumferential side wall of the boss 2 is identical with the outer wall of the gas standard screw, and a groove 9 with an arc-shaped section can be formed at the upper end surface of the screw die 8 during punching. Meanwhile, the arc-shaped boss 2 with the small upper part and the large lower part can be conveniently stamped, the difficulty of forming the groove 9 is reduced, and on the other hand, when the inner wall of the groove 9 of the screw die 8 is stamped, the inner wall of the groove 9 can be extruded due to the influence of the shape of the boss 2, so that the mechanical strength of the inner wall of the groove 9 is improved, and the screw is conveniently and efficiently stamped and processed by adopting the screw die 8 in the later stage.
In order to further improve the mechanical strength of the inner wall of the groove 9, as shown in fig. 2, a protective layer 6 is coated on the outer side of the stamping die body 1, and the protective layer 6 is a titanium alloy layer and a high-strength cast aluminum alloy layer. Titanium alloy is an alloy based on titanium element and added with other elements. It has excellent properties such as corrosion resistance, heat resistance, low temperature resistance, resistance to resistance, etc. The high-strength cast aluminum alloy is used for manufacturing aviation, aerospace and other mechanical components bearing large loads, and has the advantages of high strength, plasticity and toughness and strong room-temperature stretching. The use of the two alloys as the protective layer 6 can thereby improve the mechanical strength of the mold body and contribute to the prolongation of the service life thereof.
In order to further improve the service life of the stamping die, twelve chamfers 7 are provided on the inner wall of the through hole 3 as shown in fig. 1. Therefore, when the boss 2 is adopted for stamping, the probability of deformation of the boss 2 is effectively reduced, and the service life of the stamping die is prolonged.
Example 2: the stamping die of the gas mark screw die is different from embodiment 1 in that: as shown in fig. 1, a protective layer 6 is coated on the outer side of the stamping die body 1, and the protective layer 6 is a high-strength cast aluminum alloy layer. Among them, the high strength cast aluminum alloy is a cast aluminum alloy which can be used for manufacturing aviation, aerospace and other mechanical components bearing a large load, and has the advantages of high strength, plasticity and toughness, and strong room temperature stretching. Thereby improving the mechanical strength of the die body and being beneficial to prolonging the service life of the die body.
Example 3: the stamping die of the gas mark screw die is different from embodiment 1 in that: as shown in fig. 1, a protective layer 6 is coated on the outer side of the stamping die body 1, and the protective layer 6 is a titanium alloy layer. Wherein, the titanium alloy is an alloy which is based on titanium element and added with other elements. It has excellent properties such as corrosion resistance, heat resistance, low temperature resistance, resistance to resistance, etc. Thereby improving the mechanical strength of the die body and being beneficial to prolonging the service life of the die body.
Example 4: a processing method of a stamping die of a gas mark screw die comprises the following operation steps:
step S1, blanking and cutting: cutting the metal bar into small sections on a sawing machine after surface rust removal and cleaning treatment to obtain columnar coarse material with the size of 23X 30mm (namely, the diameter is 23mm and the height is 30 mm);
s2, grinding an outer circle: grinding the cylindrical coarse material obtained in the step S1 into an outer circle by a grinding machine;
step S3, heat treatment: quenching the cylindrical material subjected to the outer circle grinding treatment, wherein the quenching temperature is controlled to be 62-63 ℃;
step S4, slow wire feeding: carrying out internal cutting on the columnar material subjected to heat treatment on a numerical control machining machine tool, and obtaining a hexagonal through hole 3 in the center of the columnar material;
step S5, grinding head type: grinding head type processing is carried out on one end face of the column-shaped material after the slow wire feeding processing is finished through a milling machine, and a boss 2 and a flange 5 are obtained through cutting in sequence;
step S6, polishing: polishing the outer surface of the columnar material obtained in the step S5;
step S7, integrated forming: and (3) knocking and integrating the columnar shaft core 4 into the through hole 3 through a lathe to obtain a finished product stamping die.
Example 5: the processing method of the stamping die of the gas mark screw die 8 is different from that of embodiment 4 in that: in step S5, the cutting process is performed twice, the first cutting to obtain the arcuate boss 2, and the second cutting to obtain the boss 2. Therefore, in the process of processing the boss by cutting twice, if the lower end of the boss 2 is still uneven on the side close to the flange 5, the error can be eliminated by cutting twice, so that the cutting efficiency and quality of the boss are further enhanced.
Example 6: a processing method of a stamping die of a gas mark screw die comprises the following operation steps:
s1, grinding an outer circle: carrying out surface rust removal and cleaning treatment on the metal bar, and then polishing on the metal bar on a grinder;
step S2, heat treatment: quenching the cylindrical material subjected to the outer circle grinding treatment, wherein the quenching temperature is controlled to be 62-63 ℃;
step S3, blanking and cutting: cutting the columnar material obtained in the step S2 into small sections on a sawing machine to obtain a material with the size of 23 multiplied by 30 mm;
step S4, slow wire feeding: carrying out internal cutting on the heat-treated material on a numerical control machining machine tool, and obtaining a hexagonal through hole 3 in the center of the columnar material;
step S5, grinding head type: grinding head type processing is carried out on one end face of the column-shaped material after the slow wire feeding processing is finished through a milling machine, and a boss 2 and a flange 5 are obtained through cutting in sequence;
step S6, polishing: polishing the outer surface of the columnar material obtained in the step S5;
step S7, integrated forming: and (3) knocking and integrating the columnar shaft core 4 into the through hole 3 through a lathe to obtain a finished product stamping die.
The present invention is not limited by the specific embodiments, and modifications can be made to the embodiments without creative contribution by those skilled in the art after reading the present specification, but are protected by patent laws within the scope of claims of the present invention.

Claims (3)

1. The utility model provides a vapour mark screw die's stamping die's processing method, stamping die includes stamping die body (1), the one end of stamping die body (1) is equipped with boss (2) to the evagination, through-hole (3) have been seted up downwards to the upper end center part of boss (2), its characterized in that: a shaft core (4) is arranged in the through hole (3), the shaft core (4) is in interference fit with the inner wall of the through hole (3), the lower end face of the shaft core (4) is flush with the lower end face of the stamping die body (1), the upper end face of the shaft core is positioned in the boss (2), and the height of the shaft core (4) is smaller than the depth of the through hole (3);
the stamping die body (1) is convexly provided with an annular flange (5) at the position close to the annular edge of the boss (2);
the processing method of the stamping die of the gas mark screw die comprises the following steps:
step S1, blanking and cutting: cutting the metal bar into small sections on a sawing machine after surface rust removal and cleaning treatment to obtain columnar coarse materials with the size of 23 multiplied by 30 mm;
s2, grinding an outer circle: grinding the cylindrical coarse material obtained in the step S1 into an outer circle by a grinding machine;
step S3, heat treatment: quenching the cylindrical material subjected to the outer circle grinding treatment, wherein the quenching temperature is controlled to be 62-63 ℃;
step S4, slow wire feeding: carrying out internal cutting on the column-shaped material subjected to heat treatment on a numerical control machining machine tool, and obtaining a hexagonal flower-shaped through hole (3) in the center of the column-shaped material;
step S5, grinding head type: grinding head type processing is carried out on one end face of the column-shaped material after the slow wire feeding processing is finished through a milling machine, and a boss (2) and a flange (5) are obtained through cutting in sequence;
step S6, polishing: polishing the outer surface of the columnar material obtained in the step S5;
step S7, integrated forming: the columnar shaft core (4) is integrated in the through hole (3) through lathe knocking, and a finished product stamping die is obtained;
in the step S5, cutting is carried out twice, an arc-shaped boss (2) is obtained by cutting for the first time, and a flange (5) is obtained by cutting for the second time; the upper end face of the boss (2) is obliquely downwards arranged from the peripheral side to the center; the inner diameter of the circumferential side wall of the boss (2) gradually increases from the upper end face to the end close to the flange (5), and the section of the boss is in an arc shape with a small upper part and a large lower part.
2. The method for processing the stamping die of the automobile logo screw die according to claim 1, wherein the method comprises the following steps: the stamping die is characterized in that the outer side of the stamping die body (1) is coated with a protective layer (6), and the protective layer (6) is a titanium alloy layer and/or a high-strength casting aluminum alloy layer.
3. The method for processing the stamping die of the automobile logo screw die according to claim 2, wherein the method comprises the following steps: the inner wall of the through hole (3) is provided with a plurality of chamfers (7).
CN201810363434.6A 2018-04-21 2018-04-21 Stamping die of gas mark screw die and processing method thereof Active CN108273919B (en)

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CN115255138B (en) * 2022-08-12 2023-07-07 海盐恒欣宇模具有限责任公司 Stamping die capable of finely adjusting die punch

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