Uniform phosphating device for whole fine heterogeneous part
By using a circulating system of micro-pumps, tubing, and needles, along with a tray fixing method, the problem of uneven phosphating on the inner and outer surfaces of delicate components was solved, resulting in a uniform and dense phosphating film that improves the phosphating effect and corrosion resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUIZHOU QUNJIAN GEAR
- Filing Date
- 2025-05-28
- Publication Date
- 2026-04-28
AI Technical Summary
Traditional phosphating methods are difficult to achieve uniform phosphating of the inner and outer surfaces of fine and irregular components, resulting in poor phosphating layer quality. Furthermore, the size limitation of the phosphating tank makes it difficult to immerse the inner surfaces of through holes and blind holes, leading to uneven distribution of the phosphating solution, easy generation of hydrogen bubbles on the inner wall, and easy accumulation of phosphating slag on the inner hole steps, resulting in poor phosphating effect.
The phosphating solution is circulated using a micro-pump, tubing, and syringe. Parts are fixed by a tray and a stainless steel mesh, and sediment is filtered by a stainless steel filter. Phosphating is applied to both the inner and outer surfaces. A plastic tray is used to fix and control the phosphating temperature and time.
It achieves a uniform and dense phosphating film on the inner and outer surfaces of the parts, with good corrosion resistance and erosion resistance, avoiding internal pore blockage and hydrogen bubble generation, and improving the uniformity and quality of the phosphating layer.
Smart Images
Figure CN224172864U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a fine non-standard steel parts uniform phosphating device, belonging to the field of surface modification technology of metal structural parts, and is mainly aimed at non-standard steel parts that require uniform phosphating of the whole part and cover slender through holes, blind holes and stepped structures. Background Technology
[0002] Traditional phosphating methods are difficult to apply to the inner surfaces of delicate components, and the quality of the phosphating layer cannot be guaranteed. Furthermore, the size of the phosphating bath limits the application of phosphating solutions, making it difficult to immerse and plate through-holes and blind holes. In addition, the uneven distribution and poor circulation of the phosphating solution within the fine pores lead to significant variations in its composition, making it prone to generating hydrogen bubbles on the inner walls and causing phosphating slag to accumulate on the inner pore steps, thus affecting the quality of the phosphating layer.
[0003] The existing conventional method for chemical phosphating the inner surface of internal components involves using a circulating pump to inject the phosphating solution into the inner hole for circulation, while simultaneously increasing the temperature and replenishing the phosphating solution composition to control the phosphating layer on the inner hole surface. However, this method also has the following problems:
[0004] 1. For parts that require uniform phosphating, the phosphating of the inner wall and the remaining outer surfaces are two relatively independent processes, which makes it difficult to achieve uniform phosphating effects on the inner holes and outer surfaces of the parts, and the phosphating time is at least twice that of the separate processes.
[0005] 2. Excessive local temperature in the electric heating element of the phosphating tank can cause manganese salt precipitation in the heating element, which can easily lead to blockage of the inner hole during mass production, resulting in poor phosphating effect. Utility Model Content
[0006] The purpose of this invention is to provide a device for uniform phosphating of all non-standard steel components. This device can achieve phosphating treatment of the inner and outer surfaces of non-standard steel components, resulting in a uniform, dense, and firm phosphating film with good corrosion resistance and erosion resistance on the inner and outer surfaces of the parts.
[0007] The technical solution of this utility model is as follows: a device for uniform phosphating of all fine non-standard components, wherein the fine non-standard components are provided with small through holes, and the phosphating device includes a phosphating tank. The device is characterized in that: a tray is provided in the phosphating tank, a stainless steel fine mesh is laid flat on the surface of the tray, the fine non-standard components and a micro pump are placed on the stainless steel fine mesh, the outlet end of the micro pump is connected to a rubber tube, the other end of the rubber tube is connected to a needle tube, and the needle tube is inserted into one end of the small through hole of the fine non-standard component.
[0008] In the aforementioned uniform phosphating device for all fine components, the micro pump and the fine components are fixed on a tray by stainless steel wires.
[0009] In the aforementioned fine-grained component uniform phosphating device, a stainless steel filter screen is provided at the inlet end of the micro pump.
[0010] In the aforementioned fine non-component uniform phosphating device, the end of the hose is fixed to the outlet end of the micro pump by a stainless steel clamp.
[0011] The beneficial effects of this invention are as follows: Compared with the prior art, this invention achieves the circulation of phosphating solution within the inner pores of parts by setting up a micro-pump, hose, and needle. Simultaneously, by fixing the parts on a tray and placing them in the phosphating tank for phosphating treatment, the phosphating process for both inner and outer surfaces is unified, achieving a uniform and consistent phosphating effect. Furthermore, by installing a stainless steel filter screen at the inlet of the micro-pump, the risk of phosphating sludge entering the inner pores of the parts is reduced, ensuring the phosphating effect within the inner pores. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model.
[0013] Reference numerals: 1-Fine component, 2-Small through hole, 3-Phosphating tank, 4-Tray, 5-Stainless steel mesh, 6-Micro pump, 7-Hose, 8-Needle, 9-Stainless steel wire, 10-Stainless steel filter, 11-Stainless steel clamp. Detailed Implementation
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.
[0015] An embodiment of this utility model: a device for uniform phosphating of all fine non-standard components, wherein the fine non-standard component 1 is provided with a small through hole 2, and the phosphating device includes a phosphating tank 3, characterized in that: a tray 4 is provided in the phosphating tank 3, a stainless steel fine mesh 5 is laid flat on the surface of the tray 4, the fine non-standard component 1 and a micro pump 6 are placed on the stainless steel fine mesh 5, the outlet end of the micro pump 6 is connected to a rubber tube 7, the other end of the rubber tube 7 is connected to a needle tube 8, and the needle tube 8 is inserted into one end of the small through hole 2 of the fine non-standard component 1.
[0016] The micro pump 6 and the fine component 1 are fixed to the tray 4 by stainless steel wire 9, thereby fixing the micro pump 6 and the fine component 1 in place and preventing displacement of the micro pump 6 and the fine component 1 during the process of placing the tray 4 into the phosphating tank 3, which would cause the connection between them to loosen.
[0017] The micro pump 6 is equipped with a stainless steel filter screen 10 at its inlet end to filter out phosphating sludge in the phosphating solution and reduce the risk of phosphating sludge entering the fine through-hole 2.
[0018] The end of the hose 7 is fixed to the outlet end of the micro pump 6 by a stainless steel clamp 11, ensuring a firm connection between the end of the hose 7 and the outlet end of the micro pump 6.
[0019] In the use of this invention, the fine component 1 is fixed to a heat-resistant, acid- and alkali-resistant, and non-deformable plastic tray 4. The fixing method involves passing a stainless steel wire 9 through the bottom of the tray 4 and securing it to both ends of the fine component 1. A stainless steel mesh 5 is laid flat on the surface of the tray 4 to ensure that the contact area between the bottom of the fine component 1 and the stainless steel mesh 5 can still achieve the phosphating reaction. On one side of the device, a micro-pump 6 is secured to the tray 4 with the stainless steel wire 9. Then, a 10 cm long rubber tube 7 is fitted onto the outlet end of the micro-pump 6, and the end is secured with a stainless steel clamp 11. Finally, a needle 8 is installed at the outlet of the rubber tube 7, and the fine end of the needle 8 is inserted into the fine component 1 through a small through-hole 2, allowing the phosphating solution to circulate within the small through-hole 2. During phosphating, the entire device, including the fine component 1, is immersed in the phosphating tank 3. The thickness of the phosphating layer can be controlled by adjusting the tank temperature and phosphating time, while the uniformity of the phosphating layer is controlled by circulating the phosphating solution using the micro-pump 6.
[0020] This invention enables phosphating treatment of the inner and outer surfaces of steel components, resulting in a uniform, dense, and firm phosphating film with good corrosion and erosion resistance, such as Fe3(PO4)2, Mn3(PO4)2, Zn3(PO4)2, etc.
[0021] The effects of this utility model are illustrated below with specific application examples:
[0022] Bolts measuring Φ3.5×540 mm and covering the stepped through-hole structure are used to secure the parts in the phosphating device before power is connected. After the entire device is immersed in the bath solution, the power switch is turned on, allowing the solution to flow steadily from the beginning to the end of the inner hole. Finally, the parts are subjected to high-temperature phosphating treatment sequentially according to the phosphating process flow. The specific process includes degreasing → cold water rinsing → surface conditioning → high-temperature phosphating → cold water rinsing → hot water rinsing. Simultaneously, in processes other than high-temperature phosphating, compressed air can be used to intensify the treatment of the parts from bottom to top.
[0023] A longitudinal dissection of the part revealed a uniform and dense black phosphate layer on the inner wall of the tube. Chemical analysis showed that the phosphate layer consisted of Fe3(PO4)2, Mn3(PO4)2, and Zn3(PO4)2.
[0024] Implementation effect
[0025] 1. Immersion in a phosphating bath achieves uniform phosphating of both inner and outer surfaces;
[0026] 2. The solution circulates at a uniform speed in the inner hole, and no hydrogen bubbles are generated on the inner wall;
[0027] 3. Adding a filter screen to the micro pump can prevent phosphate residue from accumulating on the inner pore steps;
[0028] 4. A uniform, dense, and firm dark black phosphating film with a thickness of 5~10μm is formed in the inner hole of the part.
Claims
1. A device for uniform phosphating of a fine, non-standard component, wherein the fine, non-standard component (1) is provided with fine through holes (2), and the phosphating device includes a phosphating tank (3), characterized in that: A tray (4) is provided in the phosphating tank (3). A stainless steel fine mesh (5) is laid flat on the surface of the tray (4). A fine component (1) and a micro pump (6) are placed on the stainless steel fine mesh (5). A rubber tube (7) is connected to the outlet end of the micro pump (6). A needle tube (8) is connected to the other end of the rubber tube (7). The needle tube (8) is inserted into one end of the small through hole (2) of the fine component (1).
2. The fine-grained, uniform phosphating device for all components according to claim 1, characterized in that: The micro pump (6) and the fine component (1) are fixed on the tray (4) by stainless steel wire (9).
3. The fine-grained, uniform phosphating device for all components according to claim 1, characterized in that: The micro pump (6) is equipped with a stainless steel filter screen (10) at its inlet end.
4. The fine-grained, uniform phosphating device for all components according to claim 1, characterized in that: The end of the hose (7) is fixed to the outlet end of the micro pump (6) by a stainless steel clamp (11).