Electrochemical machining process of open knife net and open knife net

Abstract

The present application relates to the technical field of razors, and in particular to an electrochemical machining process for an open blade net and the open blade net, wherein the open blade net comprises a blade net body, the blade net body comprises a round surface layer and a base, the round surface layer and the base are fixedly connected by a plurality of connecting rods, some of the connecting rods are removed by the electrochemical machining process, and a plurality of beard entry gaps are formed; the ends of the connecting rods removed by the electrochemical machining process are bent inward to form hooks; the matrix of the electrolyte used in the electrochemical machining process is water, the solutes are sodium nitrate and a chelating agent, the mass fraction of the sodium nitrate is 15-22%, the mass fraction of the chelating agent is ≤5%, and the chelating agent is prepared by polymerization reaction of DOTA-acrylamide and a carboxylic acid containing a double bond; the metal ions generated at the anode are not easily precipitated.

Description

Technical Field

[0001] The present application relates to the technical field of razors, and in particular to an electrochemical processing technology of an open blade net and the open blade net. Background Art

[0002] As people's living standards improve, consumers have higher and higher requirements for razors. Razors generally include a blade net, which can block the blade and thus protect the skin. In addition, the blade net can also use negative pressure to absorb shaved beard debris into the razor through the mesh of the blade net, making it easy to clean.

[0003] Among them, for the structural design of the knife net, such as perforation and other operations, there is already a technology that uses electrochemical processing methods to remove excess materials. In electrochemical processing, electrochemical force is used instead of mechanical force to remove material from the workpiece, so as to obtain the expected design structure. In electrochemical processing, the metal substrate, that is, the workpiece, is the anode, and the tool electrode is the cathode. The cathode obtains electrons and releases hydroxide ions. The anode metal releases electrons and then gradually turns into metal ions, thereby achieving the purpose of removing excess material from the workpiece. For some requirements that require material removal at specific locations, tubular electrodes are usually set to drain the electrolyte, and part of the material of the workpiece is removed through the end of the workpiece tubular electrode. However, the metal ions generated by the anode are very easy to react with hydroxide to form precipitation attached to the outer wall of the end of the tubular electrode. After a long time, it is easy to wear the inner wall of the workpiece after the material is removed, and the workpiece needs to be processed again. Summary of the invention

[0004] In order to prevent the metal ions generated by the anode from forming precipitation, the present application provides an electrochemical machining process of an open knife net and an open knife net.

[0005] In the first aspect, the present application provides an electrochemical machining process for an open knife net, adopting the following technical scheme: an electrochemical machining process for an open knife net, the open knife net includes a knife net body, the knife net body includes a circular surface layer and a base, the circular surface layer and the base are fixedly connected by a plurality of connecting rods, some of the connecting rods are removed by the electrochemical machining process to form a plurality of whisker gaps; the ends of the connecting rods after being removed by the electrochemical machining process are bent inward to form hooks; the matrix of the electrolyte used in the electrochemical machining process is water, and the solutes are sodium nitrate and a chelating agent, the mass fraction of the sodium nitrate is 15-22%, the mass fraction of the chelating agent is ≤5%, and the chelating agent is prepared by the polymerization reaction of DOTA-acrylamide and a carboxylic acid containing a double bond.

[0006] By adopting the above-mentioned technical scheme, the present application prepares polymer chelates, which can capture metal ions more quickly. The formed complex structure also contains redundant carboxyl groups, so that the formed complex can still be dissolved in the solution by relying on the remaining carboxyl groups, thereby not forming precipitation, thereby extending the service life of the tubular electrode, eliminating the need for frequent repairs, and improving production efficiency.

[0007] Preferably, the parameters of the electrochemical machining process are as follows: the electrolyte pressure is 0.8-1.1 MPa, the electrode voltage is 6-8 V, and the current is 25-35 mA.

[0008] By adopting the above technical solution and setting the process parameters, the electrochemical machining of the open knife net can be carried out smoothly and effectively.

[0009] As a preference: the preparation method of the chelating agent is as follows: With water as solvent, add 45-55 parts by weight of DOTA-acrylamide and 8-10 parts by weight of small molecule unsaturated carboxylic acid, stir until dissolved, then add 1.8-2.28 parts by weight of free radical initiator, then heat to 65-80°C, stir while heating, stir and react for 7-10 hours, evaporate and concentrate, remove the solvent, and obtain a chelating agent.

[0010] By adopting the above technical scheme, DOTA-acrylamide and small molecule unsaturated carboxylic acid can be polymerized under the action of an initiator. In the obtained polymer, the DOTA-acrylamide structure can chelate with metal ions well, and the small molecule unsaturated carboxylic acid contains more residual carboxylic acid groups, so that the complex can be dissolved in water and is not easy to form precipitation.

[0011] Preferably, the small molecule unsaturated carboxylic acid is one or more of methacrylic acid, acrylic acid, cinnamic acid and crotonic acid.

[0012] By adopting the above technical scheme, theoretically, small molecule unsaturated carboxylic acids within these ranges can be used to prepare chelating agents with similar technical effects to those of the present application, which are not explored one by one in the examples of the present application.

[0013] Preferably, the free radical initiator is ammonium persulfate or potassium persulfate.

[0014] By adopting the above technical solution, both ammonium persulfate and potassium persulfate can initiate polymerization well.

[0015] Preferably, the weight portion of the DOTA-acrylamide added is 50, the weight portion of the small molecule unsaturated carboxylic acid added is 2.05, and the weight portion of the free radical initiator added is 2.05.

[0016] By adopting the above technical scheme, in the polymerization reaction, when the amount of monomer added remains unchanged, more initiator is added, and the more free radicals it produces, the lower the molecular weight of the obtained polymer. The present application uses ammonium persulfate as an initiator. As the amount of its addition gradually increases, the lower the molecular weight of the chelating agent obtained, the fewer carboxyl groups it contains individually. It contains fewer carboxyl groups, and after it chelates metal ions, the remaining carboxyl groups are not enough to dissolve in water; it contains more carboxyl groups, and it can chelate more metal ions, and it is also more difficult to dissolve in water. When the addition amount is this ratio, the performance of the obtained chelating agent is better.

[0017] Preferably, in the electrolyte, the mass fraction of the chelating agent is 4%.

[0018] By adopting the above technical solution, when the mass fraction of the added chelating agent is 4%, the metal ions can be completely chelated, and the prepared complex can be well dissolved in water. When the added amount continues to increase, it will cause waste of the chelating agent and increase the viscosity of the electrolyte, which is not conducive to practical operation.

[0019] In the second aspect, the present application provides an open knife net, which adopts the following technical solution: An open knife net is produced by the electrochemical processing process of the open knife net according to claims 1-7.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application prepares polymer chelates, which can capture metal ions more quickly. The formed complex structure also contains redundant carboxyl groups, so that the formed complex can still be dissolved in the solution by relying on the remaining carboxyl groups, thereby not forming precipitation, so that the tubular electrode can be used for a longer time without frequent repairs, thereby improving production efficiency.

[0021] 2. In the electrochemical machining process of the present application, a chelating agent prepared by polymerization reaction is added. The chelating agent can chelate with the metal ions generated by the workpiece during the electrolysis process, thereby preventing the metal ions from combining with hydroxide to form precipitation attached to the outer walls of both sides of the tubular electrode, so that when the connecting rod removes the material, the removed part of the inner wall is not smooth enough, requiring secondary processing, affecting efficiency. The chelating agent prepared in the present application can continuously prepare more than 5724 qualified knife net products for the tubular electrode, and the highest can reach 6897, which greatly reduces the repair rate of the tubular electrode, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the knife net body in Example 1.

[0023] Figure 2It is a schematic diagram of the structure of an electrochemical device.

[0024] Explanation of the reference numerals: 1. blade net body; 11. circular surface layer; 12. base; 13. connecting rod; 2. whisker inlet gap; 3. hook; 4. control mechanism; 5. driving rod; 6. electrolyte manifold; 7. tubular electrode; 8. electrolyte tank; 9. delivery pump; 10. clamping part. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the specific contents.

[0026] raw material The raw materials used in the electrochemical machining process of the present application are all purchased from the market. Example

[0027] Example 1 An open knife net, such as Figure 1 As shown, the knife net body 1 includes a circular surface layer 11 and a base 12, and the circular surface layer 11 and the base 12 are fixedly connected by a plurality of connecting rods 13, and the connecting rods 13 and the base 12 are on the same inclined plane. Part of the connecting rods 13 are partially removed by electrochemical processing, and the positions where the part of the material is removed form evenly arranged beard inlet gaps 2. The connecting rods 13 form an inwardly bent hook 3 at the end after the electrochemical processing, which can block the outer side of the moving knife to prevent the skin surface of the user from being scratched by the moving knife. The average thickness of the connecting rod 13 is 0.5 mm.

[0028] The electrochemical device used in the electrochemical processing of this embodiment is laboratory scale, such as Figure 2 As shown, the electrochemical device includes a control mechanism 4, which is electrically connected to a pressing assembly, and the pressing assembly includes a driving rod 5, and the driving rod 5 is connected to a driving motor (not shown in the figure), and the driving motor drives the driving rod 5 to move up and down. The lower end of the driving rod 5 is fixedly connected to an electrolyte manifold 6, and the end of the electrolyte manifold 6 away from the driving rod 5 is connected to a tubular electrode 7, and the tubular electrode 7 is connected to the electrolyte manifold 6. A knife net is placed under the tubular electrode 7 so that the part of the connecting rod 13 to be removed is placed under the tubular electrode 7. The driving rod 5 drives the electrolyte manifold 6 and the tubular electrode 7 to move up and down, so that part of the material of the connecting rod 13 can be removed, thereby forming a whisker inlet gap 2.

[0029] The electrolyte manifold 6 is connected to an electrolyte tank 8 for conveying electrolyte, and a delivery pump 9 is provided between the electrolyte manifold 6 and the electrolyte tank 8, and the delivery pump 9 is electrically connected to the control mechanism 4. The control mechanism 4 can control the delivery pump 9 to control the electrolyte pressure.

[0030] The two sides of the tubular electrode 7 are also clamped by clamping members 10. The clamping members 10 are connected to the cathode of the power supply as a power connector, and the anode of the power supply is connected to the base 12 of the knife net, so as to partially remove the connecting rod 13.

[0031] The voltage applied to the tubular electrode 7 is 6-8V. During the pressing process, the current gradually decreases, the current range is about 25-35mA, and the electrolyte pressure is 1.0MPa. The knife net is made of stainless steel, and its components and the mass percentage of each component are as follows: C: 0.04%, Si: 0.52%, P: 0.021%, N: 0.03%, Cr: 24.7%, S: 0.001%, Ni: 19.2%, Mn: 1.36%, Mo: 0.2, Cu: 0.3%, Al: 0.03%, and the balance is Fe. The matrix of the electrolyte is water, and the solute is sodium nitrate and a chelating agent, the mass fraction of sodium nitrate is 20%, and the mass fraction of the chelating agent is 3%. The preparation method of the chelating agent is as follows: Under a nitrogen atmosphere, add 50 g of DOTA-acrylamide and 8.6 g of methacrylic acid to 200 g of water, stir until completely dissolved, then add 1.8 g of ammonium persulfate, and then heat to 70°C, stir while heating, stir and react for 8 hours, evaporate and concentrate, remove the solvent, and obtain a chelating agent.

[0032] Example 2 An open knife net is different from Example 1 in that the amount of ammonium persulfate added during the preparation of the chelating agent used in the electrochemical machining process is 2.05 g, and the remaining steps are the same as Example 1.

[0033] Example 3 An open knife net is different from Example 1 in that the amount of ammonium persulfate added during the preparation of the chelating agent used in the electrochemical machining process is 2.28 g, and the remaining steps are the same as Example 1.

[0034] Example 4 An open knife net is different from Example 2 in that the mass fraction of the chelating agent in the electrolyte used in its electrochemical machining process is 4%, and the remaining steps are the same as Example 2.

[0035] Example 5 An open knife net is different from Example 2 in that the mass fraction of the chelating agent in the electrolyte used in its electrochemical machining process is 5%, and the remaining steps are the same as Example 2.

[0036] Comparative Example Comparative Example 1 An open knife net is different from Example 2 in that no chelating agent is added to the electrolyte used in its electrochemical machining process, and the remaining steps are the same as Example 2.

[0037] Comparative Example 2 An open knife net is different from Example 1 in that the chelating agent in the electrolyte used in its electrochemical machining process is DOTA-acrylamide, and the remaining steps are the same as Example 1.

[0038] Performance testing Detection method / test method The open knife net was processed according to the electrochemical machining process of Examples 1-5 and Comparative Examples 1-2, and then worked continuously until the product removal requirements could not be met, that is, after the excess material of the connecting rod 13 was removed, the inner wall of the removed part was heavily scratched and required secondary processing; then the number of products of the prepared open knife net was recorded separately, as shown in Table 1.

[0039] Table 1 Test results of Examples 1-5 and Comparative Examples 1-2 The number of qualified products of Knife Network Example 1 5724 Example 2 6137 Example 3 5510 Example 4 6892 Example 5 6897 Comparative Example 1 2658 Comparative Example 2 4874 Through Examples 1-5 and Comparative Examples 1-2, as well as the test data in Table 1, it can be seen that in the electrochemical machining process of the present application, by adding a chelating agent obtained by polymerization reaction, the chelating agent can chelate with the metal ions generated by the workpiece during the electrolysis process, thereby preventing the metal ions from combining with hydroxide to form a precipitate attached to the outer walls on both sides of the tubular electrode 7, so that when the connecting rod 13 removes the material, the inner wall of the removed part is not smooth enough, and secondary processing is required, which affects the efficiency. The chelating agent prepared in the present application can enable the tubular electrode 7 to continuously prepare qualified knife net products with a number of more than 5724, and a maximum of 6897, which greatly reduces the repair rate of the tubular electrode 7, thereby improving production efficiency.

[0040] Through the chelate, the metal ions and hydroxides can be reduced to form precipitation attached to the tubular electrode 7, but after the simple chelate and metal ions are chelated, part of the complex formed can still form precipitation. The present application prepares a polymer chelate, which can capture metal ions more quickly. The formed complex structure also contains redundant carboxyl groups, so that the formed complex can still be dissolved in the solution by relying on the remaining carboxyl groups, so that no precipitation is formed, and the tubular electrode 7 can be used for a longer time. This can be verified by the test data of Example 1 and Comparative Examples 1-2.

[0041] In the polymerization reaction, when the amount of monomer added remains unchanged, more initiator is added, and the more free radicals it produces, the lower the molecular weight of the polymer obtained. The present application uses ammonium persulfate as an initiator. As the amount of its addition gradually increases, the lower the molecular weight of the chelating agent obtained, the fewer carboxyl groups it contains individually. It contains fewer carboxyl groups, and after it chelates metal ions, the remaining carboxyl groups are not enough to dissolve in water; it contains more carboxyl groups, and it can chelate more metal ions, and it is also more difficult to dissolve in water. Therefore, it can be seen from the test data of Examples 1-3 that the molecular weight of the chelating agent in Example 2 is a better choice. On this basis, when the mass fraction of the added chelating agent is 4%, the metal ions can be chelated completely.

[0042] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An electrochemical machining process of an open knife net, characterized in that: The open knife net comprises a knife net body (1), the knife net body (1) comprises a round surface layer (11) and a base (12), the round surface layer (11) and the base (12) are fixedly connected via a plurality of connecting rods (13), a portion of the connecting rods (13) are removed via an electrochemical processing process to form a plurality of whisker entry gaps (2); the ends of the connecting rods (13) removed via the electrochemical processing process are bent inwardly to form hooks (3); The matrix of the electrolyte used in the electrochemical machining process is water, and the solutes are sodium nitrate and a chelating agent. The mass fraction of the sodium nitrate is 15-22%, and the mass fraction of the chelating agent is ≤5%. The chelating agent is prepared by polymerization reaction of DOTA-acrylamide and a carboxylic acid containing a double bond.

2. The electrochemical machining process of an open knife net according to claim 1, characterized in that: The parameters of the electrochemical machining process are as follows: electrolyte pressure is 0.8-1.1 MPa, electrode voltage is 6-8 V, and current is 25-35 mA.

3. The electrochemical machining process of an open knife net according to claim 1, characterized in that: The preparation method of the chelating agent is as follows: With water as solvent, add 45-55 parts by weight of DOTA-acrylamide and 8-10 parts by weight of small molecule unsaturated carboxylic acid, stir until dissolved, then add 1.8-2.28 parts by weight of free radical initiator, then heat to 65-80°C, stir while heating, stir and react for 7-10 hours, evaporate and concentrate, remove the solvent, and obtain a chelating agent.

4. The electrochemical machining process of an open knife net according to claim 3, characterized in that: The small molecule unsaturated carboxylic acid is one or more of methacrylic acid, acrylic acid, cinnamic acid and crotonic acid.

5. The electrochemical machining process of an open knife net according to claim 3, characterized in that: The free radical initiator is ammonium persulfate or potassium persulfate.

6. The electrochemical machining process of an open knife net according to claim 3, characterized in that: The weight portion of the DOTA-acrylamide added is 50, the weight portion of the small molecule unsaturated carboxylic acid added is 2.05, and the weight portion of the free radical initiator added is 2.

05.

7. The electrochemical machining process of an open knife net according to claim 1, characterized in that: In the electrolyte, the mass fraction of the chelating agent is 4%.

8. An open knife net, characterized by: The open knife net is made by the electrochemical processing process of the open knife net described in claims 1-7.

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