Shaft sleeve gear electroplated layer finishing tool

Abstract

The utility model provides a finishing tool for an electroplated layer of a sleeve shaft gear, which comprises a mandrel and a back cap, the sleeve shaft gear is sleeved on the mandrel, one end of the mandrel is provided with a positioning section which is matched with an inner hole of the sleeve shaft gear to realize radial positioning support, and the other end of the mandrel is provided with a conical section. A taper hole is formed in the back cap, the back cap is sleeved on the conical section of the mandrel through the taper hole and is in conical surface fit with the mandrel, and threads are arranged on the outer circle of the back cap and are in threaded connection with an inner hole of the sleeve shaft gear. The back cap enables the elastic petals to expand in the radial direction through conical surface extrusion, so that the sleeve shaft gear is expanded and fixed, and the coaxiality and the stability of a workpiece in the finishing process are guaranteed. According to the tool, through accurate radial positioning and coaxiality control, the precision and efficiency of finishing machining are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of tooling fixtures and relates to a tooling for finishing the electroplating layer of a sleeve shaft gear. Background Art

[0002] In the field of surface treatment technology processing, due to the complexity of product functions and the diversification of environmental requirements, higher design and quality requirements are placed on product surface treatment, which also greatly increases the difficulty of process technology assurance. The requirement for single-state surface treatment (single electroplating layer) on a part has also developed into the demand for multi-state surface treatment (that is, multiple electroplating layers exist at the same time). Moreover, the complexity of product structure also makes the electroplating process more complicated, thereby increasing the difficulty of electroplating process processing.

[0003] After conventional electroplating process, if the coating is thin (≤5μm), no further processing (re-trim) is generally required, and the appearance can directly meet the requirements. However, when the coating is thick (for example, when the chromium layer is 40μm or thicker), the electroplating layer cannot meet the flatness, verticality, runout and other form and position tolerance requirements required for the final use of the coating surface by direct electroplating, so it is necessary to use certain processing methods to perform appropriate trimming on the coating surface.

[0004] The structure of the sleeve gear is as follows Figure 1 As shown, the surface treatment technology requires three electroplated layers: a 3μm thick cadmium (Cd) layer on Area A, a 3μm thick silver (Ag) layer on Area B, and a 40μm thick chromium (Cr) layer on Area C. The electroplating process primarily utilizes different electroplating solutions, using physical isolation to provide non-conductive shielding. A graded electroplating method is employed. In the first step, the silver-plated area in Area B and the chromium-plated area in Area C are shielded with a dedicated protective sleeve. The cadmium-plated layer in Area A is then surface treated with cadmium (Cd). In the second step, silver is plated, with Areas A and C shielded with a dedicated protective sleeve, and silver (Ag) is plated on Area B. Finally, chromium is plated, with Areas A and B shielded with a dedicated protective sleeve, and chromium (Cr) is plated on Area C. Due to the thicker electroplated layer in Area C, dimensional control accuracy is difficult to meet technical requirements, seriously impacting the surface quality consistency and aesthetic requirements of the product after electroplating.

[0005] In the surface treatment of sleeve gears with multi-layer electroplating, especially areas with thick chromium layers, post-plating trimming is required to ensure that the required dimensions and geometric tolerances are met. However, traditional fixtures struggle to ensure radial positioning and coaxiality of the sleeve gear during the trimming process, which can easily lead to machining deviations and affect the final quality. Therefore, a specialized tooling is needed to precisely position and secure the sleeve gear to improve machining accuracy and efficiency. Utility Model Content

[0006] In view of this, the purpose of the present invention is to solve the problem of trimming thick electroplating layers and to provide a tool for trimming the electroplating layers of sleeve gears.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0008] A tool for finishing the electroplating layer of a sleeve gear, comprising a core shaft and a back cap; the sleeve gear is sleeved on the core shaft, one end of the core shaft is provided with a positioning section, the positioning section cooperates with the inner hole of the sleeve gear to provide radial positioning support for the sleeve gear, and the other end of the core shaft is provided with a conical section;

[0009] The back cap is provided with a tapered hole, and is sleeved on the conical section through the tapered hole, and forms a conical surface fit with the core shaft; the outer circle of the back cap is provided with a thread, and is threadedly connected to the inner hole of the sleeve gear through the thread;

[0010] The tapered hole is provided with slots evenly distributed around the circumference, connecting the threads on the outer circumference of the back cap with the tapered hole, forming multiple elastic petals. When the back cap is threadedly connected to the sleeve gear, the back cap moves under the drive of the threads. After the conical section of the core shaft fits into the tapered hole, the elastic petals expand radially under the pressure of the conical surface, thereby radially tightening and securing the sleeve gear. At the same time, the back cap is centered by the tapered surface, overcoming the problem of poor centering in threaded connections.

[0011] Furthermore, the core shaft passes through the back cap, and both ends of the core shaft are provided with a central hole.

[0012] Furthermore, a positioning shoulder is provided on one side of the positioning section of the core shaft, and the sleeve gear is axially limited by the positioning shoulder.

[0013] Furthermore, the positioning section of the core shaft and the inner hole of the sleeve gear are matched with H7 / j6.

[0014] Furthermore, the cone angle of the cone surface where the core shaft and the back cap fit together is 60°.

[0015] The beneficial effects of the present invention are:

[0016] 1. This utility model achieves precise positioning and fixation of the sleeve gear through the coordination of the core shaft and the inner hole of the sleeve gear, as well as the design of the positioning section and the conical section. In particular, the back cap fits the conical section of the core shaft through the tapered hole, and the elastic petals expand radially through the extrusion of the conical surface. This ensures that the sleeve gear is stably radially tightened and fixed during the trimming process, overcoming the radial positioning deviation that is prone to occur in traditional fixtures. This ensures that the workpiece's form and position tolerances, such as coaxiality, flatness, and perpendicularity, are controlled during trimming, significantly improving machining accuracy.

[0017] 2. The utility model realizes the centering function of the sleeve gear by utilizing the cone surface of the core shaft and the back cap. The cone surface structure can not only provide a stable centering effect.

[0018] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a structural diagram of the sleeve gear in the utility model.

[0021] Figure 2 It is an overall schematic diagram of the trimming tool in the present invention.

[0022] Figure 3 Schematic diagram of the back cap structure.

[0023] Reference numerals: 1 - core shaft; 2 - back cap; 3 - sleeve gear. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0025] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] See also Figures 1 to 3 , which is a method for trimming the electroplating layer of a sleeve gear. In the process of electroplating the three areas A, B, and C on the sleeve gear 3 using a graded electroplating method, the specific electroplating process adopts the electroplating method in CN117552064A. The thickness of the electroplated chromium in area C is controlled to be greater than the thickness required for the finished product, leaving a trimming margin. After being clamped in a trimming tool, area C is precision ground to ensure that the size of the electroplated layer in area C meets the requirements of the finished product.

[0028] The electroplating layer trimming of the sleeve gear in this embodiment includes a core shaft 1 and a back cap 2; the sleeve gear 3 is sleeved on the core shaft 1, and a positioning section is provided at one end of the core shaft 1, and the positioning section cooperates with the Φ98H7 inner hole at the left end of the sleeve gear 3 to radially position and support the sleeve gear 3, and a conical section is provided at the other end of the core shaft 1; a tapered hole is provided in the back cap 2, and it is sleeved on the conical section through the tapered hole, and a conical surface is formed between it and the core shaft 1; a thread is provided on the outer circle of the back cap 2, and the thread is connected to the inner hole thread of the sleeve gear 3 using M105×1.5-6H / 6g; the tapered hole is provided with grooves evenly distributed around the circumference, and the thread on the outer circle of the back cap 2 is connected with the tapered hole to form multiple elastic petals; when the back cap 2 is threadedly connected to the sleeve gear 3, the back cap 2 moves driven by the thread, and after the conical section of the core shaft 1 fits with the tapered hole, the elastic petals expand radially under the extrusion of the cone surface, thereby radially tightening and fixing the sleeve gear 3. At the same time, the back cap 2 is centered by the tapered surface, overcoming the problem of poor centering of the threaded connection.

[0029] The core shaft 1 passes through the back cap 2, and both ends of the core shaft 1 are provided with a center hole. The positioning section of the core shaft 1 and the inner hole of the sleeve gear 3 are matched with a Φ98H7 / j6. The cone angle of the contact surface between the core shaft 1 and the back cap 2 is 60°.

[0030] A positioning shoulder is provided on one side of the positioning section of the core shaft 1 , and the sleeve gear 3 is axially limited by the positioning shoulder.

[0031] The method in this embodiment is used to trim and grind the outer circle and end face of the electroplated chrome Φ124, and the grinding outer circle and end face runout is ≤0.005mm, achieving a good precision control effect, which is far lower than the finished product runout requirement of ≤0.030mm.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A tool for finishing the electroplating layer of a sleeve gear, characterized by: It includes a core shaft and a back cap; the sleeve gear is sleeved on the core shaft, one end of the core shaft is provided with a positioning section, the positioning section cooperates with the inner hole of the sleeve gear to provide radial positioning support for the sleeve gear, and the other end of the core shaft is provided with a conical section; The back cap is provided with a tapered hole, and is sleeved on the conical section through the tapered hole, and forms a conical surface fit with the core shaft; the outer circle of the back cap is provided with a thread, and is threadedly connected to the inner hole of the sleeve gear through the thread; The tapered hole is provided with grooves evenly distributed around the circumference, and the threads on the outer circle of the back cap are connected with the tapered hole to form multiple elastic petals. When the back cap is threadedly connected to the sleeve gear, the back cap moves driven by the threads, and after the conical section of the core shaft fits into the tapered hole, the elastic petals expand radially under the extrusion of the conical surface, thereby radially tightening and fixing the sleeve gear.

2. The tool for finishing the electroplating layer of a sleeve gear according to claim 1, characterized in that: The core shaft passes through the back cap, and both ends of the core shaft are provided with a central hole.

3. The tool for finishing the electroplating layer of a sleeve gear according to claim 1, characterized in that: A positioning shoulder is provided on one side of the positioning section of the core shaft, and the sleeve gear is axially limited by the positioning shoulder.

4. The tool for finishing the electroplating layer of a sleeve gear according to claim 1, characterized in that: The positioning section of the core shaft and the inner hole of the sleeve gear adopt H7 / j6 matching.

5. The tool for finishing the electroplating layer of a sleeve gear according to claim 1, characterized in that: The cone angle of the cone surface where the core shaft and the back cap fit together is 60°.

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