Drip-proof steel cap

Abstract

The utility model discloses a kind of anti-dripping steel caps, including the following steps: pretreatment is carried out to part and anti-dripping steel cap, match the anti-dripping steel cap of appropriate size;Anti-dripping steel cap is sleeved in the outer circle of part, until completely adheres, ensure that the anti-dripping steel cap completely covers orifice and is not loose;Special needle cylinder is extracted with anti-permeation agent, needle cylinder is inserted into the injection opening of the anti-dripping cap to deep hole bottom, inject anti-permeation agent, until anti-permeation agent completely fills deep hole;The part of anti-permeation agent injection is placed into carburizing furnace and is carburized heat treatment according to requirement, after heat treatment, cool to room temperature, remove the anti-dripping steel cap and clean the residual anti-permeation agent in hole.The anti-permeation agent anti-dripping injection method provided by the utility model ensures that anti-permeation agent will not drip to part to cause pollution, and convenient operation, in carburizing heat treatment process, anti-permeation agent is heated and solidified, seals the inner hole and end surface of part, reaches the anti-permeation effect of the inner hole and end surface of part.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment carburizing, and in particular to a drip-proof steel cap. Background Technology

[0002] Carburizing heat treatment is a process that involves heating low-carbon steel / alloy steel (such as 20CrMnTi, 8620H, etc.) in a carbon-rich medium to allow carbon atoms to penetrate into the surface layer, followed by quenching and low-temperature tempering to achieve a "hard surface and tough core" property. For carburizing heat treatment, areas on the workpiece surface where carburizing is not permitted (such as threads, soft spline shaft holes, etc.) should undergo anti-carburizing treatment. There are four methods: First, leave machining allowance, allow slow cooling after carburizing, and machine away the carburized layer; second, protect the uncarburized areas with tightly fixed steel sleeves and collars; third, plate the uncarburized areas with copper, and when the carburized layer depth is 0.8–1.5 mm, the copper plating thickness should be 0.02–0.03 mm; fourth, apply an anti-carburizing coating. Currently, anti-carburizing coatings are commercially available and are the most widely used anti-carburizing method.

[0003] For deep-hole parts, since the inside of the hole needs to be machined after heat treatment, it is necessary to carry out anti-seepage treatment on the inside and end face of the hole during the carburizing heat treatment process to maintain the low hardness of the inside and end face of the hole, so as to facilitate subsequent hole enlargement. The currently used method of applying anti-seepage agent is prone to problems such as cracking and peeling of the coating inside the hole, carburizing agent dripping and contaminating non-seepage-proof areas, difficulty in ensuring the uniformity of anti-carburizing effect inside the hole, and low anti-seepage efficiency. Summary of the Invention

[0004] In view of the above-mentioned defects in the prior art, the technical problem to be solved by this utility model is for deep hole parts. Existing anti-carburizing heat treatment for deep hole parts suffers from problems such as easy cracking and peeling of the coating inside the hole, dripping of carburizing agent contaminating non-anti-seepage areas, difficulty in ensuring uniformity of anti-carburizing effect inside the hole, and low anti-seepage efficiency. This utility model provides an anti-drip steel cap, in which the injection opening of the anti-drip steel cap matches the deep hole, ensuring that the anti-seepage agent will not drip onto the part and cause contamination. Moreover, the operation is convenient. It only requires using a syringe to fill the hole with anti-seepage agent. During the subsequent carburizing heat treatment, the anti-seepage agent solidifies upon heating, sealing the inner hole and end face of the part, achieving an anti-seepage effect on the inner hole and end face of the part.

[0005] To achieve the above objectives, this utility model provides a drip-proof steel cap, comprising a cap body, a sleeve portion, and an injection opening. The sleeve portion and the injection opening are disposed within the cap body, and the sleeve portion and the injection opening are connected. The diameter of the sleeve portion is larger than the diameter of the injection opening. The injection opening is connected to a deep hole in the part.

[0006] Furthermore, the upper end of the socket, near the connection point with the injection opening, is chamfered.

[0007] Furthermore, the sleeve is used to allow the anti-drip steel cap to be fitted onto the outer circle of the part, and the sleeve and the part are configured to have an interference fit on the outer circle.

[0008] Furthermore, the depth of the injection opening in the socket.

[0009] Furthermore, the depth of the socket is set to 9-11mm.

[0010] Furthermore, the diameter of the injection opening is set to be smaller than the diameter of the outer circle of the part, but larger than the diameter of the deep hole of the part.

[0011] Furthermore, the diameter of the injection opening is 1mm smaller than the diameter of the outer circle of the part.

[0012] Furthermore, the chamfer near the junction with the injection opening is 1.5mm.

[0013] Furthermore, the material of the anti-drip steel cap is set to 2Cr13.

[0014] Furthermore, the outer diameter of the cap is 21.2 mm, the inner diameter of the injection opening is 12.2 mm, the inner diameter of the sleeve is 15.2 mm, and the depth of the sleeve is 9.3 mm.

[0015] Technical effect

[0016] This invention provides an anti-drip steel cap with an injection opening that matches a deep hole, ensuring that the anti-seepage agent will not drip onto the part and cause contamination. It is also easy to operate; simply use a syringe to fill the hole with the anti-seepage agent. During the subsequent carburizing heat treatment, the anti-seepage agent solidifies upon heating, sealing the inner hole and end face of the part, achieving an anti-seepage effect. This anti-drip steel cap injection method improves the anti-seepage qualification rate, prevents anti-seepage agent from dripping into contaminated areas, reduces the anti-seepage processing time for individual parts, and allows for disassembly and reuse, reducing costs and making it suitable for mass production.

[0017] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a drip-proof steel cap according to a preferred embodiment of the present invention;

[0019] Figure 2 This is a dimensional schematic diagram of a preferred embodiment of the anti-drip steel cap of this utility model;

[0020] Figure 3 This is a top view of a preferred embodiment of the present invention: a drip-proof steel cap.

[0021] Figure 4 This is a schematic diagram of a drip-proof steel cap according to a preferred embodiment of the present invention. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] In the following description, specific details, such as particular internal procedures and techniques, are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention may be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of the present invention with unnecessary detail.

[0024] like Figure 1-4 As shown, the anti-drip steel cap includes a cap body 1, a sleeve part 3, and an injection opening 2. The sleeve part 3 and the injection opening 2 are disposed inside the cap body 1 and are connected. The diameter of the sleeve part 3 is larger than the diameter of the injection opening 2. The injection opening is connected to a deep hole in the part. In this embodiment, the material of the anti-drip steel cap is 2Cr13.

[0025] The depth of the sleeve portion is greater than the depth of the injection opening. The depth of the sleeve portion is preferably 9-11 mm, more preferably 9.3 mm. The depth of the sleeve portion allows the anti-drip steel cap to fit over the outer diameter of the part, with the sleeve portion and the part configured for an interference fit. The diameter of the injection opening of the anti-drip steel cap is smaller than the diameter of the outer diameter of the part; preferably, the diameter of the injection opening is 1 mm smaller than the outer diameter of the part. The diameter of the injection opening of the anti-drip steel cap is greater than the diameter of the deep hole in the part, ensuring that it can fit over the end face of the part without affecting the anti-seepage function of the deep hole.

[0026] The upper end of the socket 3, near the connection with the injection opening 2, is chamfered 4, with a chamfer size of 1.5mm. The bottom end of the socket is chamfered 6, with a chamfer size of 1.5mm.

[0027] The present invention provides a method for injecting an anti-drip agent into an anti-drip steel cap, comprising the following steps:

[0028] Step 1: Pre-treat the parts and anti-drip steel caps, and match the anti-drip steel caps of appropriate size. Pre-treatment includes cleaning the anti-seepage areas of the parts and removing oil and oxides from these areas. Specifically, this involves using a hydrocarbon cleaning machine to clean the surface of the parts of residual oil and other impurities, preparing for the subsequent injection of anti-seepage coating.

[0029] Step 2: Place the anti-drip steel cap on the outer circle of the part until it fits completely, ensuring that the anti-drip steel cap completely covers the opening and is not loose; in specific operation, the anti-drip steel cap is placed vertically on the outer circle of the part, and then the seal is checked to ensure that there is no looseness.

[0030] Step 3: Use a special syringe to draw up the anti-seepage agent, insert the syringe into the injection opening of the anti-drip cap to the bottom of the deep hole of the part, slowly inject the anti-seepage agent, observe the filling situation in the hole, until the anti-seepage agent completely fills the deep hole;

[0031] Step 4: Place the parts injected with the anti-seepage agent into the carburizing furnace and perform carburizing heat treatment as required. After heat treatment, cool to room temperature, remove the anti-drip steel cap, and clean the residual anti-seepage agent from the hole. During carburizing heat treatment, the heating temperature is 910℃, and the treatment time is 240 minutes. After heat treatment, the parts are cooled by oil cooling. The parts are cooled to about 820℃ and then placed in an oil bath for cooling. Afterward, the parts are tempered at a low temperature of 180℃ for 2 hours. Then, the parts are pulled out of the furnace and air-cooled to room temperature.

[0032] In this embodiment of the invention, the anti-seepage agent includes a paste-like anti-seepage agent or a liquid anti-seepage agent.

[0033] Using the anti-drip steel cap and special syringe of this invention, only the syringe needs to be filled with anti-seepage agent to ensure that the anti-seepage agent will not drip onto the part and cause contamination, and the operation is convenient. In this invention, the outer circle of the part to be heat-treated does not need to be anti-seepage, and the outer circle must not be contaminated. When only the special syringe is used, the outer circle of the part is not protected, and the anti-seepage agent can easily drip onto the outer circle, causing contamination. However, with the anti-drip steel cap of this invention, the sleeve of the anti-drip steel cap covers the periphery of the outer circle of the deep hole that needs anti-seepage protection. Even if the anti-seepage agent drips, it will only drip onto the anti-drip steel cap and will not contaminate the outer circle of the part. This invention is for parts that need anti-seepage protection, such as deep holes, while the outer circle does not need to be protected, and if anti-seepage agent drips onto the outer circle, it will be contaminated.

[0034] This invention discloses a method for injecting an anti-drip agent, which utilizes a syringe and an anti-drip steel cap to control the amount of anti-drip agent injected. A specialized fine syringe ensures small, continuous injection (the anti-drip agent must fill the deep hole of the part and cover its end face). The anti-drip steel cap (i.e., the injection opening) is approximately 1.5mm higher than the inner end face of the deep hole in the part, allowing for a larger amount of anti-drip agent to be injected without overfilling. If the injection is insufficient, the end face of the part can be observed through the injection opening, and a small amount of anti-drip agent can be injected again using the syringe. In the unlikely event of overflow, the anti-drip agent will only spill onto the top of the steel cap (21.2mm in diameter) and will not fall onto the part. In rare cases where excessive anti-drip agent overflows the top of the steel cap, it will flow down the 12.8mm height of the cap. In such cases, the steel cap should be removed immediately to prevent the anti-drip agent from flowing onto the part, and the cap and part should be thoroughly cleaned of the anti-drip agent before reapplying the anti-drip agent solution.

[0035] The anti-drip steel cap in this utility model is designed with corresponding dimensions according to the size requirements of the parts. In this embodiment, an anti-drip steel cap of one size only matches parts of the corresponding size. For example, in this embodiment, the inner diameter of the anti-drip steel cap is 15.2mm and the injection opening diameter is 12.2mm. It can match parts with an outer diameter of 13.2-15.2mm for which leakage prevention is required (the outer diameter of the part must be at least 1mm larger than the injection opening to prevent insecure wearing; parts with an outer diameter of less than 13.2mm for which leakage prevention is required will not fit securely or will pass through the steel cap and cannot be worn; parts with an outer diameter greater than 15.2mm will not fit into the steel cap). Alternatively, the size of the steel cap can be redesigned based on the outer diameter of the part.

[0036] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A drip-proof steel cap, characterized in that, It includes a cap body, a sleeve portion, and an injection opening. The sleeve portion and the injection opening are disposed in the cap body, the sleeve portion and the injection opening are connected, and the diameter of the sleeve portion is larger than the diameter of the injection opening; the injection opening is connected to a deep hole in the part.

2. The anti-drip steel cap as described in claim 1, characterized in that, The upper end of the sleeve is chamfered near the connection point with the injection opening.

3. The anti-drip steel cap as described in claim 1, characterized in that, The sleeve is used to allow the anti-drip steel cap to be fitted onto the outer circle of the part, and the sleeve and the part are configured to have an interference fit on the outer circle.

4. The anti-drip steel cap as described in claim 3, characterized in that, The depth of the injection opening in the socket.

5. A drip-proof steel cap as described in claim 4, characterized in that, The depth of the socket is set to 9-11 mm.

6. A drip-proof steel cap as described in claim 1, characterized in that, The diameter of the injection opening is set to be smaller than the diameter of the outer circle of the part, but larger than the diameter of the deep hole of the part.

7. A drip-proof steel cap as described in claim 6, characterized in that, The diameter of the injection opening is 1 mm smaller than the diameter of the outer circle of the part.

8. A drip-proof steel cap as described in claim 2, characterized in that, The chamfer near the junction with the injection opening is 1.5mm.

9. A drip-proof steel cap as described in claim 2, characterized in that, The anti-drip steel cap is made of 2Cr13.

10. A drip-proof steel cap as described in claim 7, characterized in that, The outer diameter of the cap is 21.2 mm, the inner diameter of the injection opening is 12.2 mm, the inner diameter of the sleeve is 15.2 mm, and the depth of the sleeve is 9.3 mm.

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