Mold core local hardening electroplating device and electroplating process thereof

Abstract

The invention relates to the technical field of mold machining, and discloses a mold core local hardening electroplating device and an electroplating technology.The mold core local hardening electroplating device comprises an electroplating pool, first piston cylinders are fixedly connected to the outer surface of the electroplating pool at equal intervals, and first piston rods are slidably connected to the interiors of the first piston cylinders in a sealed mode; the top end of the first piston rod is fixedly connected with a top seat, and a positioning assembly is installed at the center of the bottom of the top seat. Through the arrangement of the positioning assembly, after the mold core is placed in the containing groove, when an electric telescopic rod is started to drive the top base to slide downwards, namely before the mold core is immersed into electroplating liquid in an electroplating pool, the top cover slides downwards, the mold core can be fixed in the containing base, and the exterior of a mold core cavity is sealed through expansion of an annular air bag; and meanwhile, the sealing assembly seals the bottom of the interior of the containing groove, so that electroplating liquid can only make contact with the surface of the mold core cavity, electroplating is conducted on the surface of the cavity, and local hardening of the mold core is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mold processing, in particular to a mold core local hardening electroplating device and an electroplating process thereof. Background Art

[0002] The mold core local hardening electroplating device is a professional equipment used to perform surface hardening treatment on specific local areas of the mold core. Its principle is based on electroplating technology. Through electrolysis, the metal ions in the plating solution containing metal ions that can form a hardening phase are deposited in the target local area of ​​the mold core, and after subsequent appropriate heat treatment and other processes, the local hardening is achieved, thereby improving the hardness, wear resistance, corrosion resistance and other properties of the corresponding parts of the mold core to meet the use requirements of the mold under specific working conditions.

[0003] However, traditional local electroplating of mold surfaces is mainly achieved by applying or sticking seals on the non-electroplating positions on the mold core surface, so that the sealed positions cannot contact the plating liquid in the plating tank. Therefore, after the electroplating of the object is completed, the seals need to be applied or stuck on the non-electroplating positions on the mold core surface and then torn off. Applying or sticking the seals and the subsequent tearing off operations require additional time and manpower. In large-scale mold electroplating production, this series of operations will significantly increase the production cycle and reduce the overall production efficiency, which cannot meet the needs of efficient production. For example, in some small mold processing plants, due to the use of this traditional sealing method, the time spent on sealing operations may account for 5% of the total production time per day. The time taken for applying or removing the seal is 10%-20%. Each time the seal is applied or torn off, the electroplating process needs to be interrupted and the electroplating can only be continued after the seal is processed. This makes the production process discontinuous and difficult to achieve automated production, further reducing production efficiency. It is difficult to ensure that a completely uniform and tight sealing effect can be achieved every time by applying or sticking the seal. If the seal is not tight, the plating liquid may penetrate into the non-plated area, causing the area to be plated as well, destroying the design requirements and functions of the mold. In addition, the seal may be deformed or loosened during the electroplating process due to the influence of factors such as the erosion of the plating liquid and temperature changes, further reducing the sealing effect.

[0004] Therefore, those skilled in the art provide a mold core local hardening electroplating device and an electroplating process thereof to solve the problems raised in the above background technology. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a device for local hardening and electroplating of a mold core. By setting a positioning component, after the mold core is placed inside a placement groove, when the electric telescopic rod is started to drive the top seat to slide downward, that is, before the mold core is immersed in the electroplating liquid inside the electroplating tank, the top cover slides downward, so that the mold core can be fixed inside the placement seat, and the outside of the mold core cavity is sealed by the expansion of the annular airbag. At the same time, the sealing component seals the inner bottom of the placement groove so that the electroplating liquid can only contact the surface of the mold core cavity, and the electroplating of the cavity surface can achieve local hardening of the mold core, etc., which solves the problem that after local electroplating of the traditional mold surface, a sealant needs to be applied or pasted to the non-electroplated position of the mold core surface and then torn off. The application or pasting of the sealant and the subsequent tearing-off operation require additional time and manpower investment. In large-scale mold electroplating production, this series of operations will significantly increase the production cycle, reduce the overall production efficiency, and fail to meet the needs of efficient production.

[0007] (II) Technical solution

[0008] To achieve the above, a positioning component is set, and after the mold core is placed inside the placement groove, when the electric telescopic rod is started to drive the top seat to slide downward, that is, before the mold core is immersed in the electroplating liquid inside the electroplating tank, the top cover slides downward, which can fix the mold core inside the placement seat, and seal the outside of the mold core cavity by the expansion of the annular airbag, and at the same time, the sealing component seals the inner bottom of the placement groove, so that the electroplating liquid can only contact the surface of the mold core cavity, and the electroplating of the cavity surface can achieve the purpose of local hardening of the mold core. The present invention provides the following technical solutions: a mold core local hardening electroplating device, including an electroplating tank, the outer surface of the electroplating tank is equidistantly fixedly connected to a first piston cylinder, the inner sealing and sliding connection of the first piston cylinder is a first piston rod, the top end of the first piston rod is fixedly connected to a top seat, the outer surface of the electroplating tank is fixedly installed with an electric telescopic rod, the output end of the electric telescopic rod is fixedly connected to the bottom of the top seat, and a positioning component is installed at the bottom center of the top seat;

[0009] The positioning assembly includes a support frame fixedly connected to the bottom of the top seat, the end surface of the support frame away from the top seat is fixedly connected to a placement seat, a placement groove is provided inside the placement seat, and immersion grooves are provided on the front and rear surfaces of the placement seat. The four corners of the placement seat are fixedly connected to a second piston cylinder, the second piston cylinder is sealingly and slidably connected to the inside of the second piston cylinder, the top of the second piston rod is fixedly connected to a top cover, the top of the placement seat is fixedly connected to an annular sealing gasket, and two annular air bags are fixedly installed on the inner wall of the placement seat.

[0010] Preferably, a ventilation groove is provided through the inner center of the first piston rod, an air guide tube is fixedly connected to the inner center of the support frame, and one end of the air guide tube away from the support frame is connected to the inner bottom end of the first piston cylinder through the ventilation groove.

[0011] Preferably, an elastic pad is fixedly connected to the inside of the top cover, a connecting pipe is fixedly connected to the top surface of the second piston cylinder, a sealing ring is fixedly installed on the inner wall of the second piston cylinder, an air leakage hole is opened at the bottom of the second piston cylinder, a solenoid valve is fixedly installed at the input end of the annular airbag, the input end of the solenoid valve is fixedly connected to the air intake pipe, the output end of the air guide pipe is fixedly connected to the first air distribution pipe and the second air distribution pipe, the inner top end of the second piston cylinder is connected to the interior of the first air distribution pipe through the connecting pipe, and the interior of the second air distribution pipe is connected to the interior of the annular airbag through the air intake pipe and the solenoid valve.

[0012] Preferably, the outer surface of the second piston rod is sealingly and slidingly connected to the interior of the second piston cylinder via a sealing ring.

[0013] Preferably, a liquid groove is provided at the inner bottom end of the placement seat, and a sealing component is installed at the inner bottom end of the placement seat.

[0014] Preferably, the sealing assembly includes a slide plate slidably connected to the inside of the placement seat, both side surfaces of the slide plate are fixedly connected with convex plates, the bottom of the convex plate is movably installed with a spring, the top of the slide plate is fixedly connected with a top plate, the bottom of the top plate is fixedly connected with a bottom sealing plate, and the top of the top plate is fixedly connected with a top sealing plate.

[0015] Preferably, the outer surface of the protruding plate is slidably connected to the inside of the placement seat, and the width of the top plate is greater than the diameter of the liquid passage tank.

[0016] Preferably, the size of the placement tank matches the size of the mold core, and the size of the immersion tank matches the size of the mold core cavity.

[0017] Preferably, the interior of the placement groove is connected to the bottom of the placement seat through a liquid flow groove, and a square groove matching the convex plate is provided inside the placement seat, and the outer surface of the convex plate is slidably connected inside the square groove.

[0018] An electroplating process for local hardening of a mold core, the specific process flow is as follows:

[0019] S1. During electroplating, first close the solenoid valve, and then place the mold core inside the placement tank. At this time, start the electric telescopic rod to drive the top cover to slide downward, and at the same time, the second piston rod slides downward inside the second piston cylinder, and drives the sealing assembly to slide downward, and is sealed to the surface of the immersion tank through the annular sealing gasket, so that the mold core can be fixed inside the placement seat.

[0020] S2. When the top cover slides downward, the top cover drives the top plate and the bottom sealing plate to slide downward through the mold core.

[0021] S3. When the core cavity completely overlaps with the immersion tank, the top plate is sealed to the inner bottom end of the placement tank through the bottom sealing plate and seals the liquid tank.

[0022] S4. Then open the solenoid valve, and the strong pressure inside the air guide pipe enters the annular airbag through the second air distribution pipe, the air inlet pipe and the solenoid valve, and the outside of the core cavity is sealed by the expansion of the annular airbag. At this time, except for the position where the cavity needs to be electroplated, all other positions of the model are in a sealed state.

[0023] S5. Finally, the electric telescopic rod is continued to be started, and the entire placement seat is immersed in the electroplating solution through the top seat for electroplating treatment.

[0024] (III) Beneficial effects

[0025] Compared with the prior art, the present invention provides a mold core local hardening electroplating device and an electroplating process thereof, which has the following features:

[0026] Beneficial effects:

[0027] 1. The local hardening electroplating device for the mold core is provided with a positioning component. After the mold core is placed inside the placement groove, when the electric telescopic rod is started to drive the top seat to slide downward, that is, before the mold core is immersed in the electroplating liquid inside the electroplating tank, the top cover slides downward, so that the mold core can be fixed inside the placement seat, and the outside of the mold core cavity is sealed by the expansion of the annular airbag. At the same time, the sealing component seals the inner bottom of the placement groove, so that the electroplating liquid can only contact the surface of the mold core cavity, and the electroplating of the cavity surface can achieve local hardening of the mold core.

[0028] 2. The local hardening electroplating device of the mold core can control the connection state between the air inlet pipe and the annular airbag by setting a solenoid valve, so that after the internal pressure of the first piston cylinder is increased, the top cover is driven to slide downward first. When the surface of the top cover is sealed on the surface of the annular sealing gasket and the mold core is fixed, the high-pressure gas is allowed to enter the annular airbag to seal the surface of the mold core, which can reduce the longitudinal friction between the annular airbag and the surface of the mold core, extend the service life of the annular airbag, and also avoid damage to the surface of the mold core caused by friction, thereby enhancing accuracy and protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a mold core local hardening electroplating device proposed by the present invention;

[0030] Figure 2This is a schematic diagram of the connection between the first piston cylinder and the first piston rod in a mold core local hardening electroplating device proposed by the present invention;

[0031] Figure 3 This is a structural schematic diagram of a positioning component in a mold core local hardening electroplating device proposed by the present invention;

[0032] Figure 4 This is a schematic structural diagram of a support frame in a mold core local hardening electroplating device proposed by the present invention;

[0033] Figure 5 This is a schematic structural diagram of a top cover in a mold core local hardening electroplating device proposed by the present invention;

[0034] Figure 6 A cross-sectional view of a placement seat in a mold core local hardening electroplating device proposed by the present invention;

[0035] Figure 7 A cross-sectional view of a second piston cylinder in a mold core local hardening electroplating device proposed by the present invention;

[0036] Figure 8 for Figure 7 The enlarged view of point A in the middle;

[0037] Fig. 9 for Figure 6 The enlarged view of point B in the middle;

[0038] Fig.10 The present invention is a schematic structural diagram of a sealing component in a mold core local hardening electroplating device.

[0039] In the figure: 1. electroplating tank; 2. first piston cylinder; 3. first piston rod; 31. ventilation groove; 4. top seat; 5. electric telescopic rod; 6. positioning assembly; 61. support frame; 611. air guide tube; 612. first air distribution pipe; 613. second air distribution pipe; 62. placement seat; 63. placement groove; 631. liquid flow groove; 64. soaking tank; 65. second piston cylinder; 651. connecting pipe; 652. sealing ring; 653. air vent; 66. second piston rod; 67. top cover; 671. elastic pad; 68. annular sealing pad; 69. annular airbag; 691. solenoid valve; 692. air intake pipe; 7. sealing assembly; 71. slide plate; 72. convex plate; 73. spring; 74. top plate; 75. bottom sealing plate; 76. top sealing plate. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-10 A mold core local hardening electroplating device, comprising an electroplating pool 1, a first piston cylinder 2 is equidistantly fixedly connected to the outer surface of the electroplating pool 1, a first piston rod 3 is sealingly and slidably connected inside the first piston cylinder 2, a top seat 4 is fixedly connected to the top of the first piston rod 3, an electric telescopic rod 5 is fixedly installed on the outer surface of the electroplating pool 1, an output end of the electric telescopic rod 5 is fixedly connected to the bottom of the top seat 4, a positioning component 6 is installed at the bottom center of the top seat 4, and a sealing component 7 is installed at the inner bottom end of the placement seat 62;

[0042] The positioning assembly 6 includes a support frame 61 fixedly connected to the bottom of the top seat 4, and the end surface of the support frame 61 away from the top seat 4 is fixedly connected to a placement seat 62, and a placement groove 63 is provided inside the placement seat 62, and the size of the placement groove 63 matches the size of the mold core. The front and rear surfaces of the placement seat 62 are provided with immersion grooves 64, and the size of the immersion grooves 64 matches the mold core cavity. The four corners of the interior of the placement seat 62 are fixedly connected to a second piston cylinder 65, and the interior of the second piston cylinder 65 is sealed and slidably connected to a second piston rod 66, and the top of the second piston rod 66 is fixedly connected to a top cover 67, and the top of the placement seat 62 is fixedly connected to An annular sealing gasket 68 and two annular airbags 69 are fixedly installed on the inner wall of the placement seat 62. By setting the positioning component 6, after the mold core is placed inside the placement groove 63, when the electric telescopic rod 5 is started to drive the top seat 4 to slide downward, that is, before the mold core is immersed in the electroplating liquid inside the electroplating tank 1, the top cover 67 slides downward, which can fix the mold core inside the placement seat 62, and seal the outside of the mold core cavity through the expansion of the annular airbag 69. At the same time, the sealing component 7 seals the inner bottom of the placement groove 63, so that the electroplating liquid can only contact the surface of the mold core cavity, and the electroplating of the cavity surface can achieve local hardening of the mold core.

[0043] A ventilation groove 31 is provided through the inner center of the first piston rod 3, and an air guide tube 611 is fixedly connected to the inner center of the support frame 61. The end of the air guide tube 611 away from the support frame 61 is connected to the inner bottom end of the first piston cylinder 2 through the ventilation groove 31. By setting the air guide tube 611, the state of the top cover 67 and the state change of the annular airbag 69 can be controlled according to the change of the internal air pressure of the support frame 61.

[0044] An elastic pad 671 is fixedly connected to the inside of the top cover 67, a connecting pipe 651 is fixedly connected to the top of the surface of the second piston cylinder 65, a sealing ring 652 is fixedly installed on the inner wall of the second piston cylinder 65, and a vent hole 653 is opened at the bottom of the second piston cylinder 65. A solenoid valve 691 is fixedly installed at the input end of the annular airbag 69, and the input end of the solenoid valve 691 is fixedly connected to an air intake pipe 692, and the output end of the air guide pipe 611 is fixedly connected to a first air distribution pipe 612 and a second air distribution pipe 613. The inner top of the second piston cylinder 65 is connected to the inside of the first air distribution pipe 612 through the connecting pipe 651, and the inside of the second air distribution pipe 613 is connected to the inside of the annular airbag 69 through the air intake pipe 692 and the solenoid valve 691. By setting the solenoid valve 691, the air intake pipe 692 and the annular airbag 69 can be controlled to be in a connected state.

[0045] The outer surface of the second piston rod 66 is sealingly and slidably connected to the inside of the second piston cylinder 65 via a sealing ring 652. By providing the sealing ring 652, the air tightness of the top end of the second piston cylinder 65 can be enhanced.

[0046] A liquid passing groove 631 is provided at the inner bottom end of the placement seat 62, and the sealing component 7 includes a slide plate 71 slidably connected to the inside of the placement seat 62, and the two side surfaces of the slide plate 71 are fixedly connected with convex plates 72, and the outer surface of the convex plate 72 is slidably connected to the inside of the placement seat 62, and a spring 73 is movably installed at the bottom of the convex plate 72, and the top of the slide plate 71 is fixedly connected with a top plate 74, and the width of the top plate 74 is larger than the diameter of the liquid passing groove 631. The bottom of the top plate 74 is fixedly connected with a bottom sealing plate 75, and the top of the top plate 74 is fixedly connected with a top sealing plate 76. By setting the sealing component 7, when the top cover 67 slides downward, the top cover 67 drives the top plate 74 and the bottom sealing plate 75 to slide downward through the mold core, so as to block the liquid passing groove 631, so that the inside of the placement groove 63 is in a sealed state, so that the electroplating liquid will not enter it.

[0047] The interior of the placement groove 63 is connected to the bottom of the placement seat 62 through the liquid groove 631. The interior of the placement seat 62 is provided with a square groove matching the convex plate 72. The outer surface of the convex plate 72 is slidably connected to the inside of the square groove. The sliding of the convex plate 72 in the square groove can limit the longitudinal sliding of the slide plate 71. When the material is electroplated, the elasticity of the spring 73 can make the slide plate 71 and the top plate 74 slide upward to push the material out of the placement groove 63, making it easy to take out the placement groove 63.

[0048] An electroplating process for local hardening of a mold core, characterized in that the specific process flow is as follows:

[0049] S1. When in use, first close the solenoid valve 691, and then place the mold core inside the placement groove 63. At this time, by starting the electric telescopic rod 5, the top cover 67 is driven to slide downward, and at the same time, the second piston rod 66 slides downward inside the second piston cylinder 65, and drives the sealing assembly 7 to slide downward, and is sealed and fitted to the surface of the immersion tank 64 through the annular sealing gasket 68, so that the mold core can be fixed inside the placement seat 62.

[0050] S2. When the top cover 67 slides downward, the top cover 67 drives the top plate 74 and the bottom sealing plate 75 to slide downward through the mold core.

[0051] S3. When the core mold cavity completely overlaps with the immersion tank 64, the top plate 74 is sealed to the inner bottom end of the placement tank 63 through the bottom sealing plate 75, and seals the liquid tank 631.

[0052] S4. Then open the solenoid valve 691, and the strong pressure inside the air guide tube 611 enters the annular airbag 69 through the second air distribution pipe 613, the air inlet pipe 692 and the solenoid valve 691, and the outside of the core cavity is sealed by the expansion of the annular airbag 69. At this time, except for the position where the cavity needs to be electroplated, all other positions of the model are in a sealed state.

[0053] S5. Finally, by continuing to start the electric telescopic rod 5, the placement seat 62 is immersed in the electroplating solution through the top seat 4 for electroplating.

[0054] In summary, when the mold core local hardening electroplating device is in use, first the solenoid valve 691 is in a closed state, the air inlet pipe 692 and the annular airbag 69 are in a disconnected state, and then the mold core is placed inside the placement groove 63. At this time, when the electric telescopic rod 5 is started to drive the top seat 4 to slide downward, that is, before the mold core is immersed in the electroplating liquid inside the electroplating tank 1, the top cover 67 slides downward, and at the same time, when the first piston rod 3 slides downward, the strong pressure at the bottom end of the first piston cylinder 2 enters the internal top end of the second piston cylinder 65 through the ventilation groove 31, the air guide pipe 611 and the first air distribution pipe 612. At this time, the second piston rod 66 slides downward inside the second piston cylinder 65, and drives the sealing assembly 7 to slide downward, and is sealed and fitted to the surface of the immersion tank 64 through the annular sealing gasket 68, so that the mold core can be fixed inside the placement seat 62;

[0055] When the top cover 67 slides downward, the top cover 67 drives the top plate 74 and the bottom sealing plate 75 to slide downward through the mold core. When the mold core cavity completely overlaps with the immersion tank 64, the top plate 74 is sealed to the inner bottom end of the placement tank 63 through the bottom sealing plate 75, and seals the liquid tank 631. Then the solenoid valve 691 is opened, and the strong pressure inside the air guide pipe 611 enters the annular airbag 69 through the second air distribution pipe 613, the air inlet pipe 692 and the solenoid valve 691, and the outside of the mold core cavity is sealed by the expansion of the annular airbag 69. At this time, except for the position where the cavity needs to be electroplated, the other positions of the model are in a sealed state. By continuing to start the electric telescopic rod 5, the placement seat 62 is immersed in the plating solution as a whole through the top seat 4 for electroplating.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mold core local hardening electroplating device, comprising an electroplating tank (1), characterized in that: The outer surface of the electroplating pool (1) is equidistantly fixedly connected to a first piston cylinder (2), the interior of the first piston cylinder (2) is sealingly and slidably connected to a first piston rod (3), the top end of the first piston rod (3) is fixedly connected to a top seat (4), an electric telescopic rod (5) is fixedly installed on the outer surface of the electroplating pool (1), the output end of the electric telescopic rod (5) is fixedly connected to the bottom of the top seat (4), and a positioning component (6) is installed at the bottom center of the top seat (4); The positioning assembly (6) comprises a support frame (61) fixedly connected to the bottom of the top seat (4); the end surface of the support frame (61) away from the top seat (4) is fixedly connected to a placement seat (62); a placement groove (63) is provided inside the placement seat (62); the front and rear surfaces of the placement seat (62) are provided with soaking grooves (64); the four corners of the placement seat (62) are fixedly connected to a second piston cylinder (65); the interior of the second piston cylinder (65) is sealingly and slidably connected to a second piston rod (66); the top of the second piston rod (66) is fixedly connected to a top cover (67); the top of the placement seat (62) is fixedly connected to an annular sealing gasket (68); and the inner wall of the placement seat (62) is fixedly mounted with two annular air bags (69).

2. A mold core local hardening electroplating device according to claim 1, characterized in that: A ventilation groove (31) is provided through the inner center of the first piston rod (3), and an air guide tube (611) is fixedly connected to the inner center of the support frame (61). The end of the air guide tube (611) away from the support frame (61) is connected to the inner bottom end of the first piston cylinder (2) through the ventilation groove (31).

3. A mold core local hardening electroplating device according to claim 2, characterized in that: An elastic pad (671) is fixedly connected to the inside of the top cover (67); a connecting pipe (651) is fixedly connected to the top of the surface of the second piston cylinder (65); a sealing ring (652) is fixedly installed on the inner wall of the second piston cylinder (65); a vent hole (653) is opened at the bottom of the second piston cylinder (65); a solenoid valve (691) is fixedly installed at the input end of the annular airbag (69); the input end of the solenoid valve (691) is fixedly connected to the air intake pipe (692); the output end of the air guide pipe (611) is fixedly connected to the first air distribution pipe (612) and the second air distribution pipe (613); the top of the inside of the second piston cylinder (65) is connected to the inside of the first air distribution pipe (612) through the connecting pipe (651); the inside of the second air distribution pipe (613) is connected to the inside of the annular airbag (69) through the air intake pipe (692) and the solenoid valve (691).

4. A mold core local hardening electroplating device according to claim 3, characterized in that: The outer surface of the second piston rod (66) is sealingly and slidably connected to the interior of the second piston cylinder (65) via a sealing ring (652).

5. The mold core local hardening electroplating device according to claim 1, characterized in that: The inner bottom end of the placement seat (62) is provided with a liquid passage groove (631), and the inner bottom end of the placement seat (62) is installed with a sealing component (7).

6. A mold core local hardening electroplating device according to claim 5, characterized in that: The sealing assembly (7) comprises a slide plate (71) slidably connected to the inside of the placement seat (62), the two side surfaces of the slide plate (71) are fixedly connected to convex plates (72), the bottom of the convex plate (72) is movably mounted with a spring (73), the top of the slide plate (71) is fixedly connected to a top plate (74), the bottom of the top plate (74) is fixedly connected to a bottom sealing plate (75), and the top of the top plate (74) is fixedly connected to a top sealing plate (76).

7. A mold core local hardening electroplating device according to claim 6, characterized in that: The outer surface of the convex plate (72) is slidably connected to the inside of the placement seat (62), and the width of the top plate (74) is greater than the diameter of the liquid passage groove (631).

8. The mold core local hardening electroplating device according to claim 1, characterized in that: The size of the placement groove (63) matches the size of the mold core, and the size of the soaking groove (64) matches the size of the mold core cavity.

9. A mold core local hardening electroplating device according to claim 6, characterized in that: The interior of the placement groove (63) is connected to the bottom of the placement seat (62) through the liquid passage groove (631), and a square groove matching the convex plate (72) is provided inside the placement seat (62), and the outer surface of the convex plate (72) is slidably connected inside the square groove.

10. The electroplating process for local hardening of a mold core according to any one of claims 1 to 9, characterized in that: The specific process is as follows: S1. When in use, first close the solenoid valve (691), then place the mold core inside the placement groove (63). At this time, the electric telescopic rod (5) is started to drive the top cover (67) to slide downward, and at the same time, the second piston rod (66) slides downward inside the second piston cylinder (65), and drives the sealing assembly (7) to slide downward, and is sealed to the surface of the immersion tank (64) through the annular sealing gasket (68), so that the mold core can be fixed inside the placement seat (62). S2. When the top cover (67) slides downward, the top cover (67) drives the top plate (74) and the bottom sealing plate (75) to slide downward through the mold core. S3. When the core mold cavity completely overlaps with the immersion tank (64), the top plate (74) is sealed to the inner bottom end of the placement tank (63) through the bottom sealing plate (75) and seals the liquid tank (631). S4. Then the solenoid valve (691) is opened, and the strong pressure inside the air guide tube (611) enters the interior of the annular airbag (69) through the second air distribution tube (613), the air inlet pipe (692) and the solenoid valve (691), and the outside of the core cavity is sealed by the expansion of the annular airbag (69). At this time, except for the position of the cavity that needs to be electroplated, all other positions of the model are in a sealed state. S5. Finally, by continuing to start the electric telescopic rod (5), the placement seat (62) is immersed in the electroplating solution through the top seat (4) for electroplating.

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