Capsule mold surface metal treatment device and method

Abstract

The invention discloses a capsule mold surface metal treatment device and method, and belongs to the technical field of surface metal treatment.The capsule mold comprises a mold shell and a core mold, the surface, forming a cavity, of the mold shell and the core mold is arranged to be a forming face, and a groove is formed in the forming face. The treatment tool comprises an iron ring, a supporting assembly, a positive electrode connecting plate and a negative electrode connecting plate. The iron rings comprise a plurality of forming surface iron rings and groove iron rings, and the distance L1 between the forming surface iron rings and the forming surface is 15-25 mm; the groove iron ring is arranged at the groove, and the distance L2 between the groove iron ring and the groove is (1 / 5-1 / 3) L1; the protection plate made of a conductive material is arranged around the edge of the forming surface; according to the supporting assembly, the distance between the forming face iron ring and the forming face and the distance between the groove iron ring and the groove can be stabilized, uniform metal protection layers can be generated step by step and in different areas by adjusting the electrifying time and the electrifying current after electrifying, the protection plates can share charges on the edges of the metal protection layers, and finishing is not needed after metal treatment is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of surface metal treatment, and in particular to a device and method for treating the surface metal of a capsule mould. Background Art

[0002] During the tire vulcanization process, a bladder is required to inflate and shape the tire blank to complete the vulcanization of the tire. A special bladder mold is required to produce the bladder. The structure of the bladder mold is mainly composed of a shell and a core mold. The cavity surfaces of the shell and the core mold are the main molding surfaces of the vulcanization bladder. A groove of matching shape is provided on the molding surface corresponding to the clamping edge of the bladder.

[0003] Since the working environment of the capsule mold is high temperature, high pressure and highly viscous rubber raw materials, relying solely on the performance of the mold base material itself cannot meet the requirement of non-adhesion to rubber, and will also affect comprehensive performance such as service life, safety and reliability; therefore, the molding surface of the capsule mold needs to be metal-treated to achieve non-stick wall during the capsule vulcanization process.

[0004] At present, the metal treatment method for the molding surface of the capsule mold is to attach a uniform metal protective layer to the molding surface. Due to the irregular grooves on the molding surface, the metal protective layer produced by the existing metal treatment device for the surface of the capsule mold is less uniform, especially in the grooves, which are prone to uneven thickness, burning, burrs, pitting and other quality problems, and the work efficiency is low. In addition, after the overall metal treatment of the molding surface is completed, the metal protective layer at the edge of the molding surface needs to be trimmed.

[0005] Therefore, it is an urgent problem to be solved at this stage to develop and design a capsule mold surface metal treatment device and method that can attach a protective layer in steps and zones on the capsule mold molding surface, produce a uniform metal protective layer, have high work efficiency, and especially ensure the quality of the molding surface grooves. Summary of the Invention

[0006] In response to the problems existing in the prior art, the present invention provides a device and method for metal processing on the surface of a capsule mold. The iron ring of the processing tooling is respectively provided with a molding surface iron ring and a groove iron ring at the molding surface and the groove. The iron ring is fixed on the support assembly and can stabilize the distance between the molding surface iron ring and the molding surface, and the groove iron ring and the groove. After power is applied through the positive connecting plate and the negative connecting plate, the metal processing of the capsule mold surface can be achieved in steps and zones by adjusting the power-on time and the power-on current, and a uniform metal protective layer can be produced, thereby avoiding quality problems such as uneven thickness, easy burning, burring, and pitting in the groove, and having high work efficiency. At the same time, the protective plate made of conductive material can share the charge on the edge of the metal protective layer, so that the metal protective layer will not gather at the edge of the molding surface, solving the problem of needing to trim after the metal processing is completed.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a surface metal treatment device for a capsule mold, wherein the capsule mold comprises a mold shell and a core mold, wherein the mold shell and the core mold cooperate to form a cavity for accommodating a vulcanization bladder, wherein the surfaces of the mold shell and the core mold used to form the cavity are provided as molding surfaces, wherein the molding surfaces are provided with grooves matching the clip edge of the vulcanization bladder, and wherein the device comprises: A processing tool, the processing tool is used to perform metal processing on the forming surface; the processing tool includes an iron ring, a support assembly, a positive connecting plate and a negative connecting plate; the iron ring is fixed on the support assembly, and the support assembly is fixed on the capsule mold, the support assembly includes an insulating portion, and the insulating portion is located between the iron ring and the capsule mold; the positive connecting plate is coupled to the iron ring, and the negative connecting plate is coupled to the capsule mold; the iron ring includes a forming surface iron ring and a groove iron ring, the forming surface iron ring is provided in plurality, the plurality of forming surface iron rings are distributed along the axial direction of the capsule mold, the forming surface iron rings extend along the circumferential direction of the capsule mold, and the distance L1 between the forming surface iron ring and the forming surface is set to 15-25 mm; the groove iron ring is provided at the groove and extends along the circumferential direction of the capsule mold, and the distance L2 between the groove iron ring and the groove is set to (1 / 5-1 / 3) L1; A protective plate is arranged around the edge of the forming surface and is made of conductive material.

[0008] As an optimal technical solution, the processing tooling includes a first tooling that matches the forming surface on the mold shell; the forming surface iron ring and the groove iron ring of the first tooling are respectively set as the first iron ring and the second iron ring, and the support assembly of the first tooling includes a fixed claw and a support frame arranged in the mold shell, the first iron ring is arranged on the fixed claw, and the second iron ring is arranged on the support frame.

[0009] As a preferred technical solution, a plurality of vertical rods are provided on the outside of the formwork, the upper ends of the vertical rods are connected to the upper ends of the fixing claws via first connectors, and the lower ends of the vertical rods are provided with first support bases, which are fixedly connected to the formwork; the first support bases form the insulating portion; And / or, the support frame includes a plurality of circumferentially distributed radially extending support arms, the second iron ring is connected to the ends of all the support arms; a center rod is provided at the bottom of the support frame, the bottom of the center rod is connected to a base, the formwork is located between the support frame and the base, and the support frame and the base form the insulating portion; the protective plate includes a first protective plate and a second protective plate, the first protective plate is attached to the formwork and is located at the upper edge of the forming surface of the formwork, a conductive wire is provided between the second connecting member and the third protective plate; the second protective plate is attached to the formwork and is located at the lower edge of the forming surface of the formwork; And / or, the fixing claw is provided with a notch matching the first iron ring, and the first iron ring is fixedly installed in the notch.

[0010] As an optimal technical solution, the processing tooling includes a second tooling that matches the forming surface on the core mold; the forming surface iron ring and the groove iron ring of the second tooling are respectively set as the third iron ring and the fourth iron ring, and the support assembly of the second tooling includes a plurality of second support seats and fixed seats arranged outside the core mold, the third iron ring is arranged on the second support seat, and the fourth iron ring is arranged on the fixed seat.

[0011] As a preferred technical solution, the second supporting seat and the fixing seat are both fixed to the core mold via a second connecting member, and the second connecting member forms the insulating portion; And / or, the protective plate includes a third protective plate and a fourth protective plate, the third protective plate is attached to the core mold and located at the upper edge of the molding surface of the core mold, and the fourth protective plate is attached to the core mold and located at the lower edge of the molding surface of the core mold.

[0012] In a second aspect, the present invention provides a method for metal treatment of a capsule mold surface, using the aforementioned device for metal treatment of a capsule mold surface, comprising the following steps: S1: Cleaning the molding surfaces of the mold shell and the core mold; S2: Installing the processing tool and the protective plate on the mold shell and the core mold; S3: completely immersing the processing tooling, the mold shell, and the core mold in the working fluid; S4: connecting the positive electrode connecting plate to the positive electrode of the power supply, and connecting the negative electrode connecting plate to the negative electrode of the power supply; S5: Use a current 2-3 times higher than the normal current density for shock, the time is 30-60S; S6: Starting power supply with a starting current of 1 / 10-1 / 5 of the normal current density and a voltage of 3.3V-3.7V, using a step-by-step power-on boost, and controlling the current and voltage to reach the normal operating current and normal operating voltage within 8-10 minutes; after 30-40 minutes, measuring the thickness of the metal protective layer at the groove; when the thickness of the metal protective layer at the groove reaches the required thickness, disconnecting the groove iron ring from the positive pole of the power supply; after 50-60 minutes, the thickness at the molding surface reaches the required thickness; S7: Powering on the forming surface iron ring and the groove iron ring for 6-15 minutes at the same time, and then ending the powering; S8: transferring the processed processing tooling, the mold shell, and the core mold to a cleaning tank to clean the molding surface; S9: disassembling the processing tool.

[0013] As a preferred technical solution, in step S1, the molding surface is cleaned with 60°C hot water to remove oil and impurities on the molding surface; And / or, in step S3, when the processing tooling, the mold shell and the core mold are completely immersed in the working liquid, they need to be preheated, and the preheating time is set to 0.5-1 hour to make the mold shell and the core mold equal to the temperature of the working liquid; And / or, in step S8, the working liquid remaining on the molding surface is cleaned with deionized water in the cleaning tank, and the molding surface is blown dry with compressed air.

[0014] As an optimal technical solution, in step S5, the normal current density is the operating current range of the mold shell and the core mold during normal metal processing; the normal operating current of the mold shell is 1500-2000A, and the normal operating voltage of the mold shell is 4.5-6V; the normal operating current of the core mold is 2300-2800A, and the normal operating voltage of the core mold is 5-6.5V.

[0015] As a preferred technical solution, in step S6, the current of the groove iron ring is set to 1500-1700A, and the voltage is set to 4.5-6.0V; the current of the forming surface iron ring is set to 1800-2000A, and the voltage is set to 4.5-6.0V.

[0016] As a preferred technical solution, after step S9, a thickness gauge is used to randomly select multiple locations to inspect the metal protective layer on the forming surface.

[0017] The beneficial effects of the present invention are as follows: 1. The capsule mold surface metal treatment device provided by the present invention can fix the iron ring on the capsule mold through the support component, so that the distance between the molding surface iron ring and the molding surface, and the groove iron ring and the groove remains stable. After the iron ring is energized, the metal adhesion layer can be uniformly adhered to the molding surfaces of the mold shell and the core mold by controlling the power-on time and the power-on current.

[0018] 2. The metal treatment method for the surface of a capsule mold provided by the present invention first polarizes the surface of the mold to be treated for a short time by using a large current, so that a metal adhesion layer is quickly attached to the entire surface of the mold to be treated, and then the current is gradually increased in a step-by-step manner to the normal operating current, so that the adhesion layer on the surface of the mold can be evenly attached.

[0019] 3. Since the molding surface of the capsule mold, especially the groove, is not a regular plane, the present invention designs a groove iron ring for the groove, and simultaneously controls the distance between the groove iron ring and the groove as well as the current and voltage of the groove iron ring to avoid quality problems such as uneven thickness, easy burning, burrs, and pitting in the groove, and completes the attachment of the metal protective layer at the groove within the specified time. Correspondingly, the molding surface iron ring is also energized at the same time. Since the attachment time of the metal attachment layer is fixed, the attachment of the metal attachment layer to all cavity surfaces can be completed by controlling the current and voltage within this time period, thereby improving work efficiency.

[0020] 4. The protective plate of the present invention is made of conductive material. The protective plate has a conductive function and can protect the non-metallic processing boundary. It shares the charge of the edge of the metal protective layer so that the metal adhesion layer will not gather at the edge of the forming surface, solving the problem of the need for trimming after the metal processing of the mold is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a first tool in one embodiment of a device for metal treatment of a capsule mold surface according to the present invention; Figure 2 for Figure 1 Schematic diagram of the structure after installation on the formwork; Figure 3 for Figure 2 sectional view of Figure 4 This is a schematic diagram of the overall structure of the second tooling in one embodiment of a device for metal treatment of a capsule mold surface according to the present invention; Figure 5 for Figure 4 Schematic diagram of the structure after installation on the core mold; Figure 6 for Figure 5 sectional view of Figure 7 This is a flow chart of a method for metal treatment on the surface of a capsule mold according to the present invention; Figure 8 This is a schematic diagram of the position selected on the drawing when measuring the mold shell forming surface; Figure 9 Schematic diagram of the positions selected during the physical measurement of the mold shell forming surface; Figure 10 This is a schematic diagram of the position selected on the drawing when measuring the core mold forming surface; Figure 11 This is a schematic diagram of the positions selected when measuring the actual forming surface of the core mold; Figure 12 The surface image of the metal protective layer formed by a conventional metal treatment method for the molding surface of the capsule mold; Figure 13 The surface image of the metal protective layer is formed by using a capsule mold surface metal treatment method of the present invention.

[0022] In the figure: 11-mold shell, 12-core mold, 13-molding surface, 14-groove, 21-first iron ring, 22-second iron ring, 23-fixing claw, 24-support frame, 25-vertical rod, 26-first connecting piece, 27-first supporting seat, 28-base, 31-third iron ring, 32-fourth iron ring, 33-second supporting seat, 34-fixed seat, 35-second connecting piece, 36-angle iron, 41-first protective plate, 42-second protective plate, 43-third protective plate, 44-fourth protective plate, 51-positive connecting plate, 52-negative connecting plate. DETAILED DESCRIPTION

[0023] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] First, please refer to Figures 1-6 , is an embodiment of a capsule mold surface metal treatment device provided by the present invention, comprising a treatment tool and a protective plate; The capsule mold includes a mold shell 11 and a core mold 12. The mold shell 11 and the core mold 12 cooperate to form a cavity for accommodating the vulcanization bladder. The surfaces of the mold shell 11 and the core mold 12 for forming the cavity are set as molding surfaces 13. The molding surfaces 13 are provided with grooves 14 that match the clip edges of the vulcanization bladder. The processing tooling is used to perform metal processing on the molding surface 13 on the mold shell 11 and the core mold 12. In this embodiment, the metal processing is electrochemical surface treatment; the processing tooling includes an iron ring, a support assembly, a positive connecting plate 51 and a negative connecting plate 52; the iron ring is fixed on the support assembly, and the support assembly is fixed on the capsule mold. The support assembly includes an insulating portion, and the insulating portion is located between the iron ring and the capsule mold; the positive connecting plate 51 is coupled to the iron ring, and the negative connecting plate 52 is coupled to the capsule mold. The positive connecting plate 51 and the negative connecting plate 52 are connected to the positive and negative poles of the power supply respectively, so that the iron ring can be energized to perform metal processing. The iron ring includes a forming surface iron ring and a groove iron ring. The forming surface iron ring is provided in plurality. The plurality of forming surface iron rings are distributed along the axial direction of the capsule mold. The forming surface iron ring extends along the circumferential direction of the capsule mold. The distance L1 between the forming surface iron ring and the forming surface 13 is set to 15-25 mm. After the forming surface iron ring is energized, a uniform metal adhesion layer can be formed at the forming surface 13. At the same time, the groove iron ring is provided at the groove 14 and extends along the circumferential direction of the capsule mold. The distance L2 between the groove iron ring and the groove 14 is set to (1 / 5-1 / 3) L1. After the groove iron ring is energized, a uniform metal adhesion layer can be formed at the groove 14. A protective plate made of conductive material is arranged around the edge of the molding surface 13, which can share the charge on the edge of the metal protective layer, so that the metal protective layer will not gather at the edge of the molding surface 13, solving the problem of needing to trim after metal processing is completed; specifically, the protective plate is preferably adsorbed to the surface of the capsule mold by magnetic attraction.

[0025] Specifically, the positive electrode connecting plate 51 is preferably an aluminum plate, and the positive electrode connecting plate 51 can be provided in multiple pieces; the negative electrode connecting plate 52 is preferably a copper plate; and the protective plate is preferably a steel plate.

[0026] It should be noted that the distance L1 between the forming surface iron ring and the forming surface 13 is the minimum distance between the forming surface iron ring and the forming surface 13, and the distance L2 between the groove iron ring and the groove 14 is the distance between the groove iron ring and the bottom surface of the groove 14. In actual production, in order to ensure the metal processing effect, the distance between the groove iron ring and the side of the groove 14 should also be taken into account and controlled as much as possible within the range of L2.

[0027] In this embodiment, please refer to Figure 1-Figure 3 The processing tooling includes a first tooling that matches the forming surface 13 on the mold shell 11; the forming surface iron ring and the groove iron ring of the first tooling are respectively set as the first iron ring 21 and the second iron ring 22, and the supporting assembly of the first tooling includes a fixed claw 23 and a support frame 24 provided in the mold shell 11, the first iron ring 21 is provided on the fixed claw 23, and the second iron ring 22 is provided on the support frame 24.

[0028] For clarification, please refer to Figure 1-Figure 3The fixing claw 23 should be provided with a notch that matches the first iron ring 21, and the first iron ring 21 is fixedly installed in the notch. The first iron ring 21 and the notch are preferably fixed by welding to ensure that the first iron ring 21 does not vibrate during use.

[0029] For details, please refer to Figure 1-Figure 3 A plurality of vertical rods 25 are provided on the outside of the mold shell 11. The upper ends of the vertical rods 25 are connected to the upper ends of the fixed claws 23 through the first connecting members 26. The lower ends of the vertical rods 25 are provided with a first support seat 27. The first support seat 27 is fixedly connected to the mold shell 11. The fixed claws 23 and the first iron ring 21 are positioned by the first support seat 27, the vertical rods 25 and the first connecting members 26; the first support seat 27 is made of insulating material to form an insulating part.

[0030] Accordingly, please refer to Figure 1-Figure 3 The support frame 24 includes a plurality of circumferentially distributed radially extending support arms, and the second iron ring 22 is connected to the ends of all the support arms; a center rod is provided at the bottom of the support frame 24, and a base 28 is connected to the bottom of the center rod, and the support arm and the second iron ring 22 are positioned by the base 28 and the center rod; the mold shell 11 is located between the support frame 24 and the base 28, and the support frame 24 and the base 28 clamp the mold shell 11 to achieve fixation, which can better position the second iron ring 22; the center rod does not contact the mold shell 11, and the support frame 24 and the base 28 are both made of insulating material to form an insulating part.

[0031] For further information, please refer to Figure 2 and Figure 3 The protective plate includes a first protective plate 41 and a second protective plate 42. The first protective plate 41 is attached to the mold shell 11 and is located at the upper edge of the molding surface 13 of the mold shell 11. The second protective plate 42 is attached to the mold shell 11 and is located at the lower edge of the molding surface 13 of the mold shell 11. The first protective plate 41 and the second protective plate 42 respectively share the charge of the upper and lower edges of the metal protective layer, so that the metal protective layer will not gather at the edge of the molding surface 13, and no trimming is required after the metal processing is completed.

[0032] In this embodiment, please refer to Figure 4-Figure 6 The processing tooling also includes a second tooling that matches the forming surface 13 on the core mold 12; the forming surface iron ring and the groove iron ring of the second tooling are respectively set as the third iron ring 31 and the fourth iron ring 32, and the support assembly of the second tooling includes a plurality of second support seats 33 and fixed seats 34 arranged outside the core mold 12, the third iron ring 31 is arranged on the second support seat 33, and the fourth iron ring 32 is arranged on the fixed seat 34.

[0033] For details, please refer to Figure 4-Figure 6 The second supporting seat 33 and the fixing seat 34 are both fixed to the core mold 12 through the second connecting member 35, and the second connecting member 35 forms an insulating portion.

[0034] For further information, please refer to Figure 4-Figure 6 The protective plate includes a third protective plate 43 and a fourth protective plate 44. The third protective plate 43 is attached to the core mold 12 and is located at the upper edge of the molding surface 13 of the core mold 12. The fourth protective plate 44 is attached to the core mold 12 and is located at the lower edge of the molding surface 13 of the core mold 12. The third protective plate 43 and the fourth protective plate 44 respectively share the charge of the upper and lower edges of the metal protective layer, so that the metal protective layer will not gather at the edge of the molding surface 13, and no trimming is required after the metal processing is completed.

[0035] It should be noted that a conductive wire may be further provided between the second connector 35 and the third protective plate 43 to further share the charge on the third protective plate 43 , reduce charge accumulation, and prevent uneven adhesion of the metal protective layer. Example 1

[0036] Second, please refer to Figures 1-13 , which is an embodiment of a method for metal treatment of a capsule mold surface provided by the present invention, using the aforementioned device for metal treatment of a capsule mold surface, comprising the following steps: S1: Use 60°C hot water to clean the molding surfaces 13 of the mold shell 11 and the core mold 12 to remove oil and impurities on the molding surfaces 13; S2: Install the first tooling and the protective plate on the mold shell 11; Specifically, the assembly process of the first tooling is as follows: first, fix the first iron ring 21 to the fixing claw 23, then connect the fixing claw 23 to the first connecting member 26, connect the first connecting member 26 to the vertical rod 25, and the vertical rod 25 to the first support seat 27; then fix the assembled first tooling to the mold shell 11 through the first support seat 27, adjust the distance L1 between the first iron ring 21 and the molding surface 13 (AB area) of the mold shell 11 to 25 mm, and control the distance L2 between the second iron ring 22 and the groove 14 (BC area) to 8 mm; install the first protective plate 41 and the second protective steel plate inside the upper and lower parts of the mold shell 11 respectively; connect several positive electrode connecting plates 51 to the first connecting member 26 and the second iron ring 22 respectively, and connect the negative electrode connecting plate 52 to the mold shell 11; S3: The processing tooling, the mold shell 11 and the core mold 12 are completely immersed in the working liquid, and then preheated. The preheating time is set to 0.75h to make the temperature of the mold shell 11 equal to that of the working liquid; S4: Connect the positive connecting plate 51 to the positive electrode of the power supply, and connect the negative connecting plate 52 to the negative electrode of the power supply; S5: Use a current twice as high as the normal current density for 30 seconds to impact the mold, increasing the polarization of the mold and shifting the electrode potential in the negative direction. This will quickly and evenly deposit a thin layer of base metal on the molding surface 13, providing a foundation for the subsequent normal deposition of the metal protective layer. The normal current density is the operating current range of the mold shell 11 and the core mold 12 during normal metal processing. Specifically, the normal operating current of the mold shell 11 is 1500A, and the normal operating voltage of the mold shell 11 is 4.5V. Conventional technology directly uses normal current density for processing. Due to the low electrode potential, the basic metal thin layer cannot be uniformly deposited on the local forming surface 13, which can easily lead to the thickness of the local metal protective layer on the forming surface 13 after the final deposition being too thin or even no metal protective layer being deposited at all. Step S5 of the present invention can also improve the bonding strength between the rapidly deposited basic metal thin layer and the surface of the mold base, effectively solving the problems of bubbling, cracking, and shedding of the metal protective layer during subsequent use that occur after treatment in the prior art. S6: Power is supplied with a starting current of 1 / 5 of the normal current density and a voltage of 3.7 V, and a step-by-step power-on and voltage-on method is used to control the current and voltage to rise to the normal operating current and normal operating voltage within 8 minutes. Based on the base metal thin layer rapidly deposited in step S5, a metal protective layer is deposited. The step-by-step power-on and voltage-on method can achieve slow deposition of the metal protective layer, allowing the reducing gas generated on the surface of the metal protective layer to be discharged in a timely manner, thereby avoiding the formation of pores and loose defects between the metal protective layer and the base metal thin layer, thereby improving the bonding strength between the metal protective layer and the base metal thin layer; Specifically, the required thickness of the metal protective layer of this embodiment is 0.02-0.03mm; since the distance between the groove iron ring and the groove 14 is small, the adhesion rate of the metal protective layer is fast, and the thickness of the metal protective layer at the groove 14 is measured after 30 minutes. When the thickness of the metal protective layer at the groove 14 reaches 0.02-0.03mm, the groove iron ring is disconnected from the positive pole of the power supply; after 50 minutes, the thickness at the forming surface 13 reaches the required thickness of 0.02-0.03mm; specifically, the current of the groove iron ring is The current of the forming surface iron ring is 1500A and the voltage is 4.5V; the current of the forming surface iron ring is 1800A and the voltage is 5.0V. By separately energizing the groove 14 and the forming surface 13, the problem of needing to match the current and voltage parameters separately due to the large difference in structural characteristics between the groove 14 and the forming surface 13 can be effectively solved. The small parameter matching treatment of the groove 14 is conveniently achieved, and the problem of surface burning, fuzzing and pitting easily appearing on the groove 14 when the groove 14 and the forming surface 13 are energized at the same time in conventional technology is effectively solved. S7: The forming surface iron ring and the groove iron ring are energized for 6 minutes at the same time to ensure that the appearance of the metal protective layer is uniform and consistent. The energization is then terminated. Since the metal treatment time at the forming surface 13 and the groove 14 is different in step S6, the surface of the formed metal protective layer is prone to being dull and having color differences. Step S7 adopts a technical solution of simultaneously energizing the forming surface 13 and the groove 14 for a relatively short time, and matching the energization parameters at the groove 14. This can achieve the deposition of the metal protective layer at the forming surface 13 and the groove 14 at the same time, so that the surface of the metal protective layer maintains a uniform and bright appearance. Please refer to Figure 12 , which is a metal protective layer formed on the molding surface of the capsule mold by conventional metal treatment methods. There are many pitting spots on the surface of the metal protective layer (such as Figure 12 As shown in the red circle, there are 13 pitting spots); please refer to Figure 13 , is a metal protective layer formed on the molding surface of the capsule mold by the present invention, and there are almost no pitting within the same surface area (such as Figure 13 (As shown by the blue circle in the figure, there is only one pitting spot). In addition, the surface of the metal protective layer is brighter and has no color difference, and is less likely to cause scorching and burring problems, thereby improving the quality of the metal protective layer. This is achieved by providing a protective plate and conductive wires, and rationally controlling the distance between the first iron ring 21 and the forming surface 13 in step S2, the distance between the second iron ring 22 and the groove 14, the preheating time in step S3, and the specific parameters in steps S5, S6, and S7. S8: The processed tooling, mold shell 11 and core mold 12 are transferred to a cleaning tank, and the residual working liquid on the molding surface 13 is cleaned with deionized water. Then the tooling, mold shell 11 and core mold 12 are taken out, and the molding surface 13 is blown dry with compressed air to prevent water stains from being left after drying. S9: dismantle the processing tooling; then use a thickness gauge to randomly select multiple locations to test the metal protective layer on the forming surface 13. If the thickness of each metal protective layer is between 0.02-0.04mm, the metal protective layer is qualified.

[0037] Please refer to Figure 8 and Figure 9 Five positions (position 1, position 2, position 3, position 4 and position 5) were selected on the molding surface 13 of the mold shell 11, and six positions were evenly selected at each position along the circumference. The thickness of the metal protective layer after the final measurement of the molding surface 13 of the mold shell 11 after treatment is shown in Table 1, which meets the thickness requirements of the metal protective layer.

[0038] Table 1

[0039] In addition, in other embodiments, in step S2, the distance L1 between the first iron ring 21 and the molding surface 13 (AB region) of the mold shell 11 can be adjusted to 20 mm, and the distance L2 between the second iron ring 22 and the groove 14 (BC region) can be controlled to 5 mm; in step S3, the preheating time is set to 0.5 h, and the parameters in steps S5, S6 and S7 are adjusted accordingly within a reasonable range, which can also make the thickness of the metal protective layer on the molding surface 13 of the mold shell 11 after treatment meet the requirements. Example 2

[0040] The main differences between this embodiment and the first embodiment are: S2: Adjust the distance L1 between the first iron ring 21 and the molding surface 13 (AB region) of the mold shell 11 to 15 mm, and control the distance L2 between the second iron ring 22 and the groove 14 (BC region) to 3 mm; S3: preheating time is set to 1h; S5: Use a current three times higher than the normal current density for impact, the time is 60S, the normal working current of the mold shell 11 is 2000A, and the normal working voltage of the mold shell 11 is 6V; S6: Start powering with a starting current of 1 / 10 of the normal current density and a voltage of 3.3V, using a step-by-step power-on boost to control the current and voltage to reach the normal operating current and voltage within 10 minutes; Specifically, the required thickness of the metal protective layer of this embodiment is 0.03-0.04mm; after 40 minutes, the thickness of the metal protective layer at the groove 14 is measured. When the thickness of the metal protective layer at the groove 14 reaches 0.03-0.04mm, the groove iron ring is disconnected from the positive pole of the power supply; the forming surface iron ring is kept energized for 50 minutes, and the thickness at the forming surface 13 reaches 0.03-0.04mm; specifically, the current of the groove iron ring is 1500A and the voltage is 4.5V; the current of the forming surface iron ring is 2000A and the voltage is 6.0V; S7: Power on the forming surface iron ring and the groove iron ring at the same time for 10 minutes to ensure that the appearance of the metal protective layer surface is uniform and then stop powering on.

[0041] Please refer to Figure 8 and Figure 9 The thickness of the metal protective layer of the mold shell 11 molding surface 13 after treatment is finally measured as shown in Table 2, which meets the thickness requirements of the metal protective layer.

[0042] Table 2 Example 3

[0043] The main differences between this embodiment and the first embodiment are: S2: Install the second tooling and the protective plate on the core mold 12; The second fixture assembly process is as follows: install the third iron ring 31 on the second support base 33, connect the plurality of second connecting members 35 to the second support base 33, connect the angle iron 36 to the second connecting member 35, and secure the fourth iron ring 32 to the angle iron 36 to form the second fixture; place the core mold 12 into the second fixture, so that the distance L1 between the third iron ring 31 and the molding surface 13 (DE area) of the core mold 12 is 15 mm; place the third protective plate 43 and the fourth protective plate 44 on the upper and lower end surfaces of the core mold 12; connect the plurality of positive electrode connecting plates 51 to the second support base 33 and the angle iron 36, respectively, and connect the negative electrode connecting plate 52 to the third protective plate 43; S5: Use a current twice as high as the normal current density for impact, the time is 30S, the normal working current of the core mold 12 is 2300A, and the normal working voltage of the core mold 12 is 5.0V; S6: Start powering with a starting current of 1 / 5 of the normal current density and a voltage of 3.7V, using a step-by-step power-on boost, and control the current and voltage to rise to the normal operating current and voltage within 8 minutes; Specifically, the required thickness of the metal protective layer of this embodiment is 0.02-0.03mm; after 30 minutes, the thickness of the metal protective layer at the groove 14 is measured. When the thickness of the metal protective layer at the groove 14 reaches 0.02-0.03mm, the groove iron ring is disconnected from the positive pole of the power supply, and the forming surface iron ring is kept energized for 50 minutes. The thickness at the forming surface 13 reaches 0.02-0.03mm; specifically, the current of the groove iron ring is 1500A and the voltage is 4.5V; the current of the forming surface iron ring is 2300A and the voltage is 5.0V; S7: Power on the forming surface iron ring and the groove iron ring at the same time for 6 minutes, and then stop powering on after ensuring that the appearance of the metal protective layer surface is uniform.

[0044] Please refer to Figure 10 and Figure 11 , eight positions (position 6, position 7, position 8, position 9, position 10, position 11, position 12 and position 13) were selected on the molding surface 13 of the core mold 12, and six positions were evenly selected at each position along the circumference. The thickness of the metal protective layer of the molding surface 13 of the core mold 12 after treatment was finally measured as shown in Table 3. The thickness of the metal protective layer met the requirements of the thickness of the metal protective layer.

[0045] Table 3 Example 4

[0046] The main differences between this embodiment and the third embodiment are: S2: Adjust the distance L1 between the third iron ring 31 and the molding surface 13 (DE area) of the core mold 12 to 25 mm; S5: Use a current three times higher than the normal current density for impact, the time is 60S, the normal working current of the core mold 12 is 2800A, and the normal working voltage of the core mold 12 is 6.5V; S6: Start powering with a starting current of 1 / 10 of the normal current density and a voltage of 3.3V, using a step-by-step power-on boost to control the current and voltage to reach the normal operating current and voltage within 10 minutes; Specifically, the required thickness of the metal protective layer of this embodiment is 0.03-0.04 mm. After 40 minutes, the thickness of the metal protective layer at the groove 14 is measured. When the thickness of the metal protective layer at the groove 14 reaches 0.03-0.04 mm, the groove iron ring is disconnected from the positive pole of the power supply. When the forming surface iron ring is powered on for 50 minutes, the thickness at the forming surface 13 reaches 0.03-0.04 mm. Specifically, the current of the groove iron ring is 1700 A and the voltage is 5.0 V; the current of the forming surface iron ring is 2800 A and the voltage is 6.5 V. S7: Power on the forming surface iron ring and the groove iron ring at the same time for 15 minutes to ensure that the appearance of the metal protective layer surface is uniform and then stop powering on.

[0047] Please refer to Figure 10 and Figure 11 The thickness of the metal protective layer of the core mold 12 molding surface 13 after treatment is finally measured as shown in Table 4, which meets the thickness requirements of the metal protective layer.

[0048] Table 4

[0049] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A device for metal processing the surface of a capsule mold, wherein the capsule mold comprises a mold shell (11) and a core mold (12), wherein the mold shell (11) and the core mold (12) cooperate to form a cavity for accommodating a vulcanization capsule, and the surfaces of the mold shell (11) and the core mold (12) for forming the cavity are set as molding surfaces (13), and the molding surfaces (13) are provided with grooves (14) matching the clip edge of the vulcanization capsule, characterized in that: include: A processing tool is used to perform metal processing on the molding surface (13); the processing tool comprises an iron ring, a support assembly, a positive electrode connecting plate (51) and a negative electrode connecting plate (52); the iron ring is fixed to the support assembly, the support assembly is fixed to the capsule mold, the support assembly comprises an insulating portion, the insulating portion is located between the iron ring and the capsule mold; the positive electrode connecting plate (51) is coupled to the iron ring, the negative electrode connecting plate (52) is coupled to the capsule mold The iron ring includes a forming surface iron ring and a groove iron ring, the forming surface iron ring is provided in a plurality, the plurality of forming surface iron rings are distributed along the axial direction of the capsule mold, the forming surface iron ring extends along the circumferential direction of the capsule mold, and the distance L1 between the forming surface iron ring and the forming surface (13) is set to 15-25 mm; the groove iron ring is provided at the groove (14) and extends along the circumferential direction of the capsule mold, and the distance L2 between the groove iron ring and the groove (14) is set to (1 / 5-1 / 3) L1; A protective plate is provided around the edge of the forming surface (13), and the protective plate is made of a conductive material.

2. A capsule mold surface metal treatment device according to claim 1, characterized in that: The processing tooling includes a first tooling that matches the forming surface (13) on the mold shell (11); the forming surface iron ring and the groove iron ring of the first tooling are respectively set as a first iron ring (21) and a second iron ring (22); the supporting assembly of the first tooling includes a fixed claw (23) and a support frame (24) arranged in the mold shell (11); the first iron ring (21) is arranged on the fixed claw (23), and the second iron ring (22) is arranged on the support frame (24).

3. The device for metal treatment of the surface of a capsule mold according to claim 2, characterized in that: A plurality of vertical rods (25) are provided on the outside of the mold shell (11), the upper ends of the vertical rods (25) are connected to the upper ends of the fixed claws (23) via first connecting members (26), and the lower ends of the vertical rods (25) are provided with first support seats (27), and the first support seats (27) are fixedly connected to the mold shell (11); the first support seats (27) form the insulating portion; And / or, the support frame (24) includes a plurality of circumferentially distributed radially extending support arms, the second iron ring (22) is connected to the ends of all the support arms; a center rod is provided at the bottom of the support frame (24), the bottom of the center rod is connected to a base (28), the mold shell (11) is located between the support frame (24) and the base (28), and the support frame (24) and the base (28) form the insulating portion; And / or, the protective plate comprises a first protective plate (41) and a second protective plate (42), the first protective plate (41) being attached to the mold shell (11) and located at the upper edge of the molding surface (13) of the mold shell (11), and the second protective plate (42) being attached to the mold shell (11) and located at the lower edge of the molding surface (13) of the mold shell (11); And / or, the fixing claw (23) is provided with a notch matching the first iron ring (21), and the first iron ring (21) is fixedly installed in the notch.

4. A capsule mold surface metal treatment device according to claim 1 or 2, characterized in that: The processing tooling includes a second tooling that matches the forming surface (13) on the core mold (12); the forming surface iron ring and the groove iron ring of the second tooling are respectively set as a third iron ring (31) and a fourth iron ring (32); the supporting assembly of the second tooling includes a plurality of second supporting seats (33) and a fixing seat (34) arranged outside the core mold (12); the third iron ring (31) is arranged on the second supporting seat (33), and the fourth iron ring (32) is arranged on the fixing seat (34).

5. The device for metal treatment of the surface of a capsule mold according to claim 4, characterized in that: The second supporting seat (33) and the fixing seat (34) are both fixed to the core mold (12) through a second connecting member (35), and the second connecting member (35) forms the insulating portion; the protective plate includes a third protective plate (43) and a fourth protective plate (44), the third protective plate (43) is attached to the core mold (12) and is located at the upper edge of the molding surface (13) of the core mold (12), and a conductive wire is provided between the second connecting member (35) and the third protective plate (43); the fourth protective plate (44) is attached to the core mold (12) and is located at the lower edge of the molding surface (13) of the core mold (12).

6. A method for metal treatment of the surface of a capsule mold, characterized in that: Using a capsule mold surface metal treatment device according to any one of claims 1 to 5 comprises the following steps: S1: Cleaning the mold shell (11) and the molding surface (13) of the core mold (12); S2: Installing the processing tool and the protective plate on the mold shell (11) and the core mold (12); S3: completely immersing the processing tool, the mold shell (11) and the core mold (12) in the working liquid; S4: connecting the positive electrode connecting plate (51) to the positive electrode of the power supply, and connecting the negative electrode connecting plate (52) to the negative electrode of the power supply; S5: Use a current 2-3 times higher than the normal current density for shock, the time is 30-60S; S6: Start powering with a starting current of 1 / 10-1 / 5 of the normal current density and a voltage of 3.3V-3.7V, adopt a step-by-step power-on boost, and control the current and voltage to rise to the normal operating current and normal operating voltage within 8-10 minutes; after 30-40 minutes, measure the thickness of the metal protective layer at the groove (14); when the thickness of the metal protective layer at the groove (14) reaches the required thickness, disconnect the groove iron ring from the positive pole of the power supply; after 50-60 minutes, the thickness at the molding surface (13) reaches the required thickness; S7: Powering on the forming surface iron ring and the groove iron ring for 6-15 minutes at the same time, and then ending the powering; S8: transferring the processed processing tool, the mold shell (11) and the core mold (12) to a cleaning tank to clean the molding surface (13); S9: disassembling the processing tool.

7. The method for metal treatment of the surface of a capsule mold according to claim 6, characterized in that: In step S1, the molding surface (13) is cleaned with 60°C hot water to remove oil and impurities on the molding surface (13); And / or, in step S3, when the processing tooling, the mold shell (11) and the core mold (12) are completely immersed in the working liquid, they need to be preheated, and the preheating time is set to 0.5-1h, so that the mold shell (11) and the core mold (12) are equal to the temperature of the working liquid; And / or, in step S8, the residual working fluid on the molding surface (13) is cleaned with deionized water in the cleaning tank, and the molding surface (13) is blown dry with compressed air.

8. The method for metal treatment of the surface of a capsule mold according to claim 6, characterized in that: In step S5, the normal current density is the operating current range of the mold shell (11) and the core mold (12) during normal metal processing; the normal operating current of the mold shell (11) is 1500-2000A, and the normal operating voltage of the mold shell (11) is 4.5-6V; the normal operating current of the core mold (12) is 2300-2800A, and the normal operating voltage of the core mold (12) is 5-6.5V.

9. The method for metal treatment of the surface of a capsule mold according to claim 6, characterized in that: In step S6, the current of the groove iron ring is set to 1500-1700A, and the voltage is set to 4.5-6.0V; the current of the forming surface iron ring is set to 1800-2000A, and the voltage is set to 4.5-6.0V.

10. The method for metal treatment of the surface of a capsule mold according to claim 6, characterized in that: After step S9, a thickness gauge is used to randomly select multiple locations to inspect the metal protective layer on the forming surface (13).

Images