Bimetal nut

Abstract

The utility model relates to the technical field of machining of mechanical parts, in particular to a bimetallic nut. A shell is of a cylindrical structure which is made of a steel material and provided with two open ends, and internal threads are machined on the inner wall of the shell; the inner sleeve is of a cylindrical structure which is made of non-ferrous metal and has two open ends, and external threads matched with the internal threads of the shell are machined on the outer wall of the inner sleeve. The shell and the inner sleeve are connected through the inner thread and the outer thread to form the bimetallic nut. And a layer of anaerobic adhesive is uniformly coated at the thread position where the shell is combined with the inner sleeve. A counter bore is machined in the tail end of the shell. A shoulder matched with the counter bore is machined at the tail end of the inner sleeve; and a clamping head is processed at the tail end of the shoulder. According to the technical scheme, the problems that in the prior art, a bimetallic nut manufactured through a centrifugal casting technology is long in machining period, complex in technology, low in yield, high in manufacturing cost and serious in environmental pollution, and non-ferrous metal is prone to stripping are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical parts processing, in particular to a bimetallic nut. Background Art

[0002] At present, machine tool lead screws and nuts are used for a long time, and the internal threads of the nuts are severely worn and the gap is too large to be used. New nuts must be replaced. There are generally two types of nuts: one is made of non-ferrous metal (copper, etc.) as a whole, and the overall replacement cost is high; the other is a steel body shell, and the threaded part is made of non-ferrous metal (bus alloy, copper, etc.) by centrifugal casting. Compared with centrifugally cast nuts, centrifugal casting has a long cycle, complex process, easy separation of steel and non-ferrous metals, low yield, high production cost, and serious environmental pollution.

[0003] In view of the problems existing in the above-mentioned prior art, it is very necessary to research and design a new type of bimetallic nut to overcome the problems existing in the prior art. Summary of the Invention

[0004] Bimetallic nuts manufactured using the centrifugal casting process proposed in the prior art suffer from long processing cycles, complex processes, easy stripping of nonferrous metals, low yield rates, high production costs, and severe environmental pollution. The present invention provides a bimetallic nut. This utility model utilizes a structure and processing method for threaded assembly after application of anaerobic adhesive and application of a preload, thereby simplifying the process, facilitating processing, reducing costs, and achieving low-carbon, environmentally friendly results.

[0005] The technical means adopted by this utility model are as follows:

[0006] A bimetallic nut comprises: an outer shell and an inner sleeve;

[0007] Furthermore, the outer shell is a cylindrical structure made of steel material with both ends open, and an internal thread is processed on its inner wall;

[0008] Furthermore, the inner sleeve is a cylindrical structure made of nonferrous metal with both ends open, and its outer wall is processed with external threads that match the internal threads of the outer shell;

[0009] Furthermore, the outer shell and the inner sleeve are connected through internal and external threads to form a bimetallic nut.

[0010] Furthermore, a layer of anaerobic adhesive is evenly coated on the threads where the outer shell and the inner sleeve are combined.

[0011] Furthermore, a countersunk hole is processed at the end of the outer shell for positioning the assembly of the inner sleeve.

[0012] Furthermore, a shoulder matching the countersunk hole is processed at the end of the inner sleeve for assembling and positioning with the countersunk hole.

[0013] Furthermore, a chuck is machined at the end of the shoulder for applying a pre-tightening force during assembly and is cut off after assembly.

[0014] A processing method for a bimetallic nut is as follows:

[0015] 1. Select a non-ferrous metal rod to make the inner sleeve, machine an internal thread hole according to the nut size and leave an allowance, machine an external thread for the outer diameter according to the designed size, and machine a shoulder at the end, retaining the chuck;

[0016] 2. Select a steel rod to make the outer shell, machine the external structure according to the nut size, machine the internal hole into an internal thread according to the external thread size designed for the inner sleeve, machine a counterbore at the end that matches the shoulder at the end of the inner sleeve, and the machined outer sleeve does not need to be removed on the machine tool and is reserved for use;

[0017] 3. Clean the internal thread of the outer shell and the external thread of the inner sleeve and reserve them for use;

[0018] 4. Uniformly apply a layer of anaerobic adhesive on the internal thread of the outer shell and the external thread of the inner sleeve;

[0019] 5. Screw the inner sleeve coated with anaerobic adhesive into the outer shell, and position the shoulder and the counterbore;

[0020] 6. Apply a certain pre-tightening force to the internal and external threads by rotating the chuck, so that the outer shell and the inner sleeve are firmly connected together. The pre-tightening force completely overcomes the cutting force generated on the workpiece during tool machining. Without waiting for the anaerobic adhesive to completely cure, the remaining machining processes can be directly completed, reducing the secondary clamping error. It belongs to one-time clamping for machining, and the coaxiality is better;

[0021] 7. Cut off the chuck and machine the internal thread of the inner sleeve to meet the finished product technical requirements.

[0022] Compared with the prior art, the present utility model has the following advantages:

[0023] 1. A bimetallic nut provided by the present utility model does not require centrifugal casting, is pollution-free, low-carbon, and environmentally friendly;

[0024] 2. A bimetallic nut provided by the present utility model has a simple process, is easy to machine, has a short machining cycle, and low cost;

[0025] 3. A bimetallic nut provided by the present utility model does not need to be disassembled after machining the steel body outer shell. After screwing in the non-ferrous metal sleeve, without waiting for the anaerobic adhesive to completely cure, the remaining machining processes can be directly processed, reducing the secondary clamping error. It belongs to one-time clamping for machining, and the coaxiality is better;

[0026] 4. A bimetallic nut provided by the present utility model, when the internal thread of the nut is severely worn, the outer shell does not need to be replaced and can be reused. Only the inner sleeve needs to be replaced, reducing materials and processes and increasing economic benefits.

[0027] In summary, the technical solution of the present invention solves the problems of bimetallic nuts made by centrifugal casting process in the prior art, such as long processing cycle, complex process, easy peeling of non-ferrous metals, low yield, high production cost and serious environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 This is a schematic diagram of the structure of the utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the uncut chuck of the utility model;

[0031] Figure 3 This is a schematic diagram of the shell structure of the utility model;

[0032] Figure 4 This is a schematic diagram of the inner sleeve structure of the utility model;

[0033] Figure 5 Schematic diagram of the structure of a bimetallic nut made by centrifugal casting process.

[0034] In the figure: 1, outer shell 11, countersunk hole 2, inner sleeve 21, shoulder 22, and clamping head. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technology, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0039] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0040] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used herein.

[0041] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meanings and thus should not be construed as limiting the protection scope of the present utility model.

[0042] As Figures 1-4 shown, the present utility model provides a bimetallic nut, which comprises: an outer shell 1 and an inner sleeve 2; the outer shell 1 is a cylindrical structure with open ends made of steel material, and an internal thread is machined on its inner wall; the inner sleeve 2 is a cylindrical structure with open ends made of non-ferrous metal, and an external thread matching the internal thread of the outer shell 1 is machined on its outer wall; the outer shell 1 and the inner sleeve 2 are connected through the internal and external threads to form a bimetallic nut.

[0043] An anaerobic adhesive is evenly coated at the threaded portion where the outer shell 1 and the inner sleeve 2 are combined.

[0044] A counterbore 11 is machined at the end of the outer shell 1 for positioning the assembly of the inner sleeve 2.

[0045] A shoulder 21 matching the counterbore 11 is machined at the end of the inner sleeve 2 for cooperating with the counterbore 11 for assembly positioning.

[0046] A chuck 22 is machined at the tail end of the shoulder 21 for applying a pre-tightening force during assembly and being cut off after assembly.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bimetallic nut, characterized in that: The bimetallic nut includes: a housing (1) and an inner sleeve (2); The housing (1) is a cylindrical structure with open ends made of steel material, and an internal thread is machined on its inner wall; The inner sleeve (2) is a cylindrical structure with open ends made of non-ferrous metal, and an external thread that matches the internal thread of the housing (1) is machined on its outer wall; The housing (1) and the inner sleeve (2) are connected by the internal and external threads to form a bimetallic nut.

2. The bimetallic nut according to claim 1, characterized in that: A layer of anaerobic adhesive is evenly applied to the threaded portion where the housing (1) is combined with the inner sleeve (2).

3. The bimetallic nut according to claim 1, characterized in that: A counterbore (11) is machined at the end of the housing (1) for positioning the assembly of the inner sleeve (2).

4. The bimetallic nut according to claim 3, characterized in that: A shoulder (21) that matches the counterbore (11) is machined at the end of the inner sleeve (2) for assembly positioning in cooperation with the counterbore (11).

5. The bimetallic nut according to claim 4, characterized in that: A chuck (22) is machined at the end of the shoulder (21) for applying a pre-tightening force during assembly and being cut off after assembly.

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