CN109047985B

CN109047985B - Manufacturing process of ring fuse 3D hard gold solid watch case

Info

Publication number: CN109047985B
Application number: CN201810773101.0A
Authority: CN
Inventors: 黄盛敏
Original assignee: Fuzhou Kemai Watch Industry Co ltd
Current assignee: Fuzhou Kemai Watch Industry Co ltd
Priority date: 2018-07-14
Filing date: 2018-07-14
Publication date: 2020-04-21
Anticipated expiration: 2038-07-14
Also published as: CN109047985A

Abstract

The invention relates to a manufacturing process of a 3D hard gold solid watchcase with an annular fuse, which can improve the purity of weld metal to the maximum extent, simultaneously ensure that a hard gold shell is not burnt by heat by controlling the current during spot welding, simultaneously ensure that the hard gold shell is firmly connected with a liner, and simultaneously is different from the manufacturing mode of the traditional hard gold shell and the traditional watchcase; on the one hand, the gold watch shell is supported, so that the strength of the watch shell is increased, on the other hand, the gold watch shell is buffered, and the abrasion caused by collision between the movement and the gold watch shell is avoided.

Description

Manufacturing process of ring fuse 3D hard gold solid watch case

Technical Field

The invention relates to the technical field of timepieces and metal processing, in particular to a manufacturing process of a ring fuse 3D hard gold solid watchcase.

Background

With the continuous improvement of living standard and artistic appreciation level, people have great promotion to watch decoration requirements and gradually exceed use requirements, so that the market of noble metal watches is getting stronger, and more consumers buy noble metal watches. Precious metal watches are usually made of gold materials and have high ornamental and collection values. The development of science and technology is changing day by day, the living standard of people is continuously improved, and the demand on watches or precious metals is more and more vigorous. In the manufacture of gold and silver noble metal artware, the welding technology plays an extremely important role, and the welding process level can also embody the technological level of the artware. Also, the welding process is becoming more and more important in the watch industry.

Welding, if the process conditions are not proper, is easy to cause the following disadvantages: 1. metal elements different from parent materials such as filling metal or brazing filler metal can be substituted for intervention, and recovery of materials is not facilitated; 2. welding cold cracks appear; 3. the thin component is melted and burnt through due to overheating during welding.

After the watch shell is made of gold, the gold is soft and easy to wear and deform, if the watch shell is worn for a long time and is continuously disassembled, friction is generated to cause great wear to the watch shell, and the ornamental value and the collection value of the noble metal watch are reduced. In the prior art, a precious metal watch shell is usually a hollow hard gold structure, an electroforming method is mainly adopted, a gold watch shell is formed by electroforming on an alloy mould, and then the alloy mould is drawn out to form the hollow watch shell structure, so that the hardness of the watch shell is improved, the used gold is reduced, and the cost is saved, but the whole wall thickness of the hollow structure is thinner, and the hollow structure is easy to deform; the solid watch case formed by die casting has a lower vickers hardness than the watch case formed by electroforming although the thickness of the watch is increased to some extent, and the solid watch case is made of a large amount of gold, which undoubtedly increases the cost.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a manufacturing process of a 3D hard gold solid shell of an annular fuse wire, which can improve the purification of weld metal to the greatest extent, and simultaneously ensure that the hard gold shell is not burnt through due to overheating and the hard gold shell and an inner container are connected firmly by controlling the current during spot welding.

The technical scheme of the invention is as follows:

a manufacturing process of a ring fuse 3D hard gold solid watch case comprises the following steps:

s1, preparing a hard gold shell and an inner container;

s2, wiping the hard gold shell and the inner container by alcohol or acetone, and then baking the fuse at the temperature of 200-400 ℃ for 1-4 hours; the hydrogen content in the welding seam is reduced, so that the cold cracking tendency of the welding seam gold is reduced;

s3, forming a ring-shaped inner container groove on the outer side of the bottom of the inner container, and forming a fuse wire on the inner surface of the bottom of the hard gold shell and adding the fuse wire between the corresponding shell grooves of the inner container groove; aligning and closely matching the inner container groove and the shell groove, and then welding to enable the inner container and the hard gold shell to be welded into a whole, so as to obtain the solid watch shell; the outer surface of the inner container is matched with the inner surface of the hard gold shell.

Further, the welding in step S3 specifically includes:

b1, aligning the inner container groove with the fuse wire with the outer shell groove, adjusting the pressure of a welding gun to 1MPa-1.5MPa under the condition of argon, and adjusting the flame of the welding tool to be thin blue flame, wherein the temperature reaches 1000-; the function of the argon can effectively prevent harmful gas from entering a molten pool so as to avoid forming welding defects;

b2, preheating the positions near the inner container groove and the outer shell groove for 1-6 seconds by using welding gun flame to enable the whole workpiece to be red;

b3, shaking flame for 80-94ms by using a welding gun according to the trend direction of the fuse wire, keeping the welding current at 80-95A, and melting and welding the joint part of the inner container groove and the outer shell groove;

and B4, immediately putting the weldment into hot lime powder for slow cooling after welding, and taking out after heat preservation for 20-48 hours. The welding stress is reduced to the minimum, thereby improving the plasticity and toughness of the weld metal and improving the crack resistance of the weld.

Furthermore, the inner container groove and the outer shell groove are U-shaped grooves, so that the welding defect of incomplete penetration can be avoided.

Further: the electrode material used by the welding gun is a cerium tungsten electrode. The work function of the cerium-tungsten electrode is about 10% lower than that of thorium-tungsten, so that the arc striking is easier and the stability is stronger. The radioactivity and oxidation resistance of the cerium tungsten electrode are greatly improved compared with those of thorium tungsten electrode, and the cerium tungsten electrode has good chemical stability, small cathode spot and less burning loss.

The invention has the following beneficial effects:

1. the process adopts electroforming a hard gold shell, the manufacturing mode of the hard gold shell is different from that of the traditional watchcase, insulating oil is coated on the inner surface of a watchcase blank, a gold watchcase with certain thickness is formed only by electroforming the outer surface of the watchcase blank, and then an inner container is welded inside the gold watchcase in a fuse wire welding mode; on the one hand, the gold watch shell is supported, so that the strength of the watch shell is increased, on the other hand, the gold watch shell is buffered, and the abrasion caused by collision between the movement and the gold watch shell is avoided.

2. The mode of fuse welding, through choosing the appropriate protective gas (argon gas is effective to avoid the harmful gas to enter the molten pool, in order to avoid forming the welding defect), adopt and shake flame 80-94ms at the same time, the welding current keeps the mode of 80-95A to go to weld, shake flame, make flame stay on fuse, because of the temperature that rises sharply, make the fuse form a punctiform molten pool, when the flame moves away, the temperature drops sharply, the liquid gold in the molten pool solidifies rapidly, will form a solder joint finally, through controlling and shaking the time of flame at this moment, weld and get the solder joint of mutual hasping downward along the trend direction of fuse, weld the inner container 21 with the said outer housing groove 11 firmly finally; through the control of the shaking flame time, the penetration depth of a certain degree can be obtained, the welding seam can not be welded through, and meanwhile, the required depth of a molten pool can be obtained through the appropriate current at lower heat energy input, so that the area of a welding heat affected zone and the degree of welding deformation are reduced, smaller welding spots are obtained, and the fine weldment is attractive after welding.

3. The invention adopts the electroforming solution to add the organic polyphosphonate, and the organic polyphosphonate has large coordination capacity, high coordination stability constant, difficult dissociation after coordination with metal ions, good stability and easy biodegradation. The organopolysilphosphonates readily react in solution with [ Au (CN)]^-CN & lt- & gt in the coordination ions forms hydrogen bonds to form a second coordination layer surrounding the coordination ions, and the inhibition effect of the first and second coordination layers is overcome when the gold particles are reduced from the coordination layer, so that the over potential of the gold ion discharge is improved, and the crystal grains of the cast gold layer are refined. The addition of polyethyleneimine in the electroforming solution can increase the brightness of the coating and improve the hardness; the addition of the thiourea derivative can improve the current efficiency of the electroforming solution and improve the quality of gold plating, and the current efficiency can be obviously improved through experimental data.

4. The invention adopts the electrode multi-degree-of-freedom motion electrodeposition technology to improve the flow field distribution of the electroforming solution fluid on the surface of the electrode, thereby not only enhancing the convective mass transfer of the electroforming solution in the nano structure, adjusting the flow field distribution and reducing the concentration difference on the surface of the cathode, but also improving the electric field distribution on the surface of the cathode. The fluid generates strong convection in the X direction, the Y direction and the Z direction, the overall mass transfer strength of the electroforming solution is enhanced, the ion concentration difference on the surface of the cathode is reduced, and the uniformity of the deposition rate of each point is improved.

Drawings

FIG. 1 is a schematic half-sectional view of a wristwatch case with a hard gold case and inner case connecting structure according to the present invention;

FIG. 2 is a schematic structural view of a connecting half section of a hard gold shell and an inner container;

FIG. 3 is a half sectional view of the bladder structure;

FIG. 4 is a half sectional view of a hard gold shell;

fig. 5 is a bottom view of the hard gold shell and the inner container connected.

Reference numerals:

1. a hard gold shell; 11. a housing slot; 2. an inner container; 21. an inner container groove; 3. -of the order of bars; 4. mirror glass; 5. bottom glass; 6. a bottom cover; 7. and (5) literal.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are commercially available products.

Example one

s1, preparing a hard gold shell 1 and an inner container 2;

s2, wiping the hard gold shell 1 and the inner container 2 by alcohol or acetone, and then baking the fuse at 200 ℃ for 3 hours;

s3, adding a fuse wire between an annular inner container groove 21 formed on the outer side of the bottom of the inner container 2 and a shell groove 11 formed on the inner surface of the bottom of the hard gold shell 1 and corresponding to the inner container groove 21; aligning and closely matching the inner container groove 21 with the shell groove 11, and then welding to enable the inner container 2 and the hard gold shell 1 to be welded into a whole, so as to obtain a solid watch shell; the outer surface of the inner container is matched with the inner surface of the hard gold outer shell 1, and the figure is 1-5.

Further, the welding in step S3 specifically includes:

b1, aligning the inner container groove 21 with the fuse wire with the shell groove 11, adjusting the pressure of a welding gun to 1MPa under the condition of argon, and adjusting the flame of a welding tool to be thin blue flame, wherein the temperature reaches 1000 ℃;

b2, preheating the positions near the inner container groove 21 and the shell groove 11 for 3 seconds by using welding gun flame to enable the whole workpiece to be red;

b3, shaking flame for 80ms by using a welding gun according to the trend direction of the fuse wire, keeping the welding current at 80A, and melting and welding the joint part of the inner container groove 21 and the shell groove 11;

and B4, immediately putting the weldment into hot lime powder for slow cooling after welding, and taking out after heat preservation for 20 hours. Further, the inner container groove 21 and the shell groove 11 are U-shaped grooves; the electrode material used by the welding gun is a cerium tungsten electrode.

Example two

s1, preparing a hard gold shell 1 and an inner container 2;

s2, wiping the hard gold shell 1 and the inner container 2 by using alcohol or acetone, and then baking the fuse at 300 ℃ for 3 hours;

s3, adding a fuse wire between an annular inner container groove 21 arranged on the outer side of the bottom of the inner container 2 and a shell groove 11 arranged on the inner surface of the bottom of the hard gold shell 1 and corresponding to the inner container groove 21; aligning and closely matching the inner container groove 21 with the shell groove 11, and then welding to enable the inner container 2 and the hard gold shell 1 to be welded into a whole, so as to obtain a solid watch shell; the outer surface of the inner container is matched with the inner surface of the hard gold shell 1.

Further, the welding in step S3 specifically includes:

b1, aligning the inner container groove 21 with the fuse wire with the shell groove 11, adjusting the pressure of a welding gun to 1.5MPa under the condition of argon, and adjusting the flame of a welding tool to be thin blue flame, wherein the temperature reaches 1100 ℃;

b2, preheating the positions near the inner container groove 21 and the shell groove 11 for 6 seconds by using welding gun flame to enable the whole workpiece to be red;

b3, shaking flame for 94ms by using a welding gun according to the trend direction of the fuse wire, keeping the welding current at 95A, and melting and welding the joint part of the inner container groove 21 and the shell groove 11;

and B4, immediately putting the weldment into hot lime powder for slow cooling after welding, and taking out after heat preservation for 48 hours.

Further, the inner container groove 21 and the shell groove 11 are U-shaped grooves; the electrode material used by the welding gun is a cerium tungsten electrode.

EXAMPLE III

s1, preparing a hard gold shell 1 and an inner container 2;

s2, wiping the hard gold shell 1 and the inner container 2 by alcohol or acetone, and then baking the fuse at 300 ℃ for 4 hours;

Further, the welding in step S3 specifically includes:

b2, preheating the positions near the inner container groove 21 and the shell groove 11 for 5 seconds by using welding gun flame to enable the whole workpiece to be red;

b3, shaking flame 88 by a welding gun according to the trend direction of the fuse wire, keeping the welding current at 87A, and melting and welding the joint part of the inner container groove 21 and the shell groove 11;

and B4, immediately putting the weldment into hot lime powder for slow cooling after welding, and taking out after heat preservation for 46 hours.

The welding machine model adopted by the utility model is a DYH200A type precision welding machine.

Performance testing

The performance test of the gold watch case manufactured by the oil pressure process and the electroforming process needs to be carried out by an appearance test and an anti-collision test;

the appearance test is mainly a manual test, namely measuring the size by using a vernier caliper, measuring the weight by using an electronic balance, and observing the flatness of a gold watch shell and the welding aesthetic degree by using naked eyes;

the anti-collision test mainly adopts artificial manufacturing collision effect, and the manufactured watchcase is thrown down for multiple times from the height of 20cm-30cm, and then the changes of the gold watch watchcase, whether the gold watch watchcase has gaps and depressions, whether the inner container falls off and the like are observed, so that the anti-collision test is used for detecting the hardness and toughness of the watchcase and the welding firmness.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. A manufacturing process of a 3D hard gold solid watch case with a ring fuse is characterized by comprising the following steps:

s1, preparing a hard gold shell (1) and an inner container (2);

s2, wiping the hard gold shell (1) and the inner container (2) by using alcohol or acetone, and then baking the fuse at the temperature of 200-400 ℃ for 1-4 hours;

s3, forming an annular liner groove (21) on the outer side of the bottom of the liner (2), forming a shell groove (11) corresponding to the liner groove (21) on the inner surface of the bottom of the hard gold shell (1), and adding a fuse wire between the shell groove and the shell groove; aligning and tightly matching the inner container groove (21) with the shell groove (11), and then welding to enable the inner container (2) and the hard gold shell (1) to be welded into a whole, thus obtaining a solid watch shell; the outer surface of the inner container is matched with the inner surface of the hard gold shell (1);

the welding in step S3 includes the following specific steps:

b1, aligning the inner container groove (21) with the fuse wire with the outer shell groove (11), adjusting the pressure of a welding gun to 1MPa-1.5MPa under the condition of argon, and adjusting the flame of the welding tool to be thin blue flame, wherein the temperature reaches 1000-;

b2, preheating the part near the inner container groove (21) and the outer shell groove (11) for 1-6 seconds by using welding gun flame to enable the whole workpiece to be red;

b3, shaking flame for 80-94ms by using a welding gun according to the trend direction of the fuse wire, keeping the welding current at 80-95A, and melting and welding the joint of the inner container groove (21) and the shell groove (11);

and B4, immediately putting the weldment into hot lime powder for slow cooling after welding, and taking out after heat preservation for 20-48 hours.

2. The manufacturing process of a ring fuse 3D hard gold solid watch case as claimed in claim 1, characterized in that: the inner container groove (21) and the outer shell groove (11) are U-shaped grooves.

3. The process for manufacturing a ring fuse 3D hard gold solid watch case as claimed in claim 2, wherein: the electrode material used by the welding gun is a cerium tungsten electrode.