Bimetal nut and machining method thereof

Abstract

The invention relates to the technical field of mechanical part machining, in particular to a bimetallic nut and a machining method thereof. A shell is of a cylindrical structure which is made of a steel material and has 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 outer shell and the inner sleeve are connected through the inner threads and the outer threads to form the double-metal 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 and used for positioning assembly of the inner sleeve. A shoulder matched with the counter bore is machined at the tail end of the inner sleeve and used for being matched with the counter bore for assembling and positioning. 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 invention relates to the technical field of mechanical parts processing, and in particular to a bimetallic nut and a processing method thereof. Background Art

[0002] At present, machine tool lead screws and nuts are used for a long time, the internal threads of the nuts are severely worn, and the gap is too large to be used, so 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, the centrifugal casting cycle is long, the process is complicated, the steel and non-ferrous metals are easy to peel off during centrifugal casting, the yield is low, the production cost is high, and the environmental pollution is serious.

[0003] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a new type of bimetallic nut and a processing method thereof, so as to overcome the problems existing in the prior art. Summary of the invention

[0004] According to the above-mentioned prior art, the bimetallic nut made by the centrifugal casting process has technical problems such as long processing cycle, complex process, low yield rate of metal stripping, high production cost, and serious environmental pollution, so a bimetallic nut and its processing method are provided. The present invention mainly utilizes the structure and processing method of thread assembly after applying anaerobic glue and applying pre-tightening force, so as to achieve the effects of simplified process, easy processing, reduced cost and low-carbon green environmental protection.

[0005] The technical means adopted by the present invention 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 matching 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, the end of the inner sleeve is processed with a shoulder matching the countersunk hole, which is used to cooperate with the countersunk hole for assembly positioning;

[0013] Furthermore, the processing method of the bimetallic nut comprises the following steps:

[0014] S51, Processing inner sleeve: Select non-ferrous metal rods to make inner sleeves, process internal thread holes according to nut size and leave allowance, process external threads according to designed size, process shoulders at the end, and retain the chuck;

[0015] S52, processing the outer shell: select steel bars to make the outer shell, process the external structure according to the size of the nut, process the inner hole into internal threads according to the external thread size designed for the inner sleeve, and process the end into a countersunk hole that matches the shoulder at the end of the inner sleeve. The finished outer shell does not need to be removed on the machine tool and is kept for use;

[0016] S53, cleaning; clean the internal threads of the outer shell and the external threads of the inner sleeve for later use;

[0017] S54, glue coating: evenly apply a layer of anaerobic glue on the internal threads of the outer shell and the external threads of the inner sleeve;

[0018] S55, Assembly: Screw the inner sleeve coated with anaerobic adhesive into the outer shell, and position the shoulder and the countersunk hole;

[0019] S56, Tightening: By rotating the chuck, a certain pre-tightening force is applied to the inner and outer threads, so that the outer shell and the inner sleeve are firmly connected together. The pre-tightening force completely overcomes the cutting force generated by the tool on the workpiece during processing. There is no need to wait for the anaerobic adhesive to be completely cured, and the remaining processing steps can be completed directly, reducing the error of secondary clamping. The processing is completed in one clamping, and the coaxiality is better;

[0020] S57, finishing processing: cut off the chuck head and process the internal thread of the inner sleeve to meet the technical requirements of the finished product.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The bimetallic nut and the processing method thereof provided by the present invention do not require centrifugal casting, are pollution-free, low-carbon, and green and environmentally friendly;

[0023] 2. The bimetallic nut and the processing method thereof provided by the present invention have simple process, easy processing, short processing cycle and low cost;

[0024] 3. The bimetallic nut and its processing method provided by the present invention do not need to be disassembled after the steel shell is processed, and the non-ferrous metal sleeve can be screwed in. The remaining processing steps can be directly processed without waiting for the anaerobic adhesive to be completely cured, thereby reducing the secondary clamping error, completing the processing in one clamping, and having better coaxiality;

[0025] 4. The present invention provides a bimetallic nut and a processing method thereof. When the inner 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, which reduces materials and processes and increases economic benefits.

[0026] 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, serious environmental pollution, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the uncut chuck state of the present invention;

[0030] Figure 3 This is a schematic diagram of the housing structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the inner sleeve structure of the present invention;

[0032] Figure 5 Schematic diagram of the structure of a bimetallic nut made by centrifugal casting process.

[0033] In the figure: 1, outer shell 11, counterbore 2, inner sleeve 21, shoulder 22, and chuck. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments 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.

[0035] 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 by no means 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 creative work are within the scope of protection of the present invention.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit 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 "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described 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 ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0038] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the 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 contours of each component itself.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0040] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0041] like Figure 1-4 As shown, the present invention provides a bimetallic nut comprising: an outer shell 1 and an inner sleeve 2; the outer shell 1 is a cylindrical structure made of steel material with both ends open, and an internal thread is processed on its inner wall; the inner sleeve 2 is a cylindrical structure made of non-ferrous metal with both ends open, and an external thread matching the internal thread of the outer shell 1 is processed on its outer wall; the outer shell 1 and the inner sleeve 2 are connected by internal and external threads to form a bimetallic nut.

[0042] The threads where the outer shell 1 and the inner sleeve 2 are combined are evenly coated with a layer of anaerobic adhesive.

[0043] A countersunk hole 11 is processed at the end of the outer shell 1 for positioning the inner sleeve 2 during assembly.

[0044] The end of the inner sleeve 2 is processed with a shoulder 21 matching the countersunk hole 11, which is used to cooperate with the countersunk hole 11 for assembly and positioning;

[0045] The processing method of the bimetallic nut comprises the following steps:

[0046] S51, processing inner sleeve 2: select nonferrous metal rod to make inner sleeve 2, process internal thread hole according to nut size and leave allowance, process external thread according to designed size of outer diameter, process shoulder 21 at the end, and retain chuck 22;

[0047] S52, processing the outer shell 1: select a steel bar to make the outer shell 1, process the external structure according to the size of the nut, process the inner hole into an internal thread according to the external thread size designed for the inner sleeve 2, and process the end into a countersunk hole 11 that matches the shoulder 21 at the end of the inner sleeve 2. The processed outer sleeve 1 does not need to be removed from the machine tool and is kept in reserve;

[0048] S53, cleaning; clean the internal thread of the housing 1 and the external thread of the inner sleeve 2 for later use;

[0049] S54, glue coating: evenly coating a layer of anaerobic glue on the internal threads of the outer shell 1 and the external threads of the inner sleeve 2;

[0050] S55, assembly: screw the inner sleeve 2 coated with anaerobic adhesive into the outer shell 1, and position the shoulder 21 with the countersunk hole 11;

[0051] S56, tightening: by rotating the chuck 22, a certain pre-tightening force is applied to the inner and outer threads, so that the outer shell 1 and the inner sleeve 2 are firmly connected together. The pre-tightening force completely overcomes the cutting force generated by the tool on the workpiece during machining. There is no need to wait for the anaerobic adhesive to be completely cured, and the remaining processing steps can be completed directly, reducing the secondary clamping error. The processing is completed by clamping once, and the coaxiality is better;

[0052] S57, finishing processing: cut off the chuck 22, and process the internal thread of the inner sleeve 2 to meet the technical requirements of the finished product.

[0053] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate 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 comprises: an outer shell (1) and an inner sleeve (2); The housing (1) is a cylindrical structure made of steel material with both ends open, and an internal thread is processed on its inner wall; The inner sleeve (2) 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 sleeve (1); The outer shell (1) and the inner sleeve (2) are connected via internal and external threads to form a bimetallic nut.

2. The bimetallic nut according to claim 1, characterized in that: The threads where the outer shell (1) and the inner sleeve (2) are combined are evenly coated with a layer of anaerobic adhesive.

3. The bimetallic nut according to claim 1, characterized in that: A countersunk hole (11) is processed at the end of the outer shell (1) for positioning the assembly of the inner sleeve (2).

4. The bimetallic nut according to claim 3, characterized in that: The end of the inner sleeve (2) is processed with a shoulder (21) matching the countersunk hole (11) for assembling and positioning with the countersunk hole (11).

5. A method for processing a bimetallic nut according to any one of claims 1 to 4, characterized in that: The processing method of the bimetallic nut comprises the following steps: S51, processing the inner sleeve (2): selecting a nonferrous metal rod to make the inner sleeve (2), processing the internal thread hole according to the size of the nut and leaving a margin, processing the external thread according to the outer diameter according to the designed size, processing the shoulder (21) at the end, and retaining the chuck (22); S52, processing the outer shell (1): select a steel bar to make the outer shell (1), process the external structure according to the size of the nut, process the inner hole into an internal thread according to the size of the external thread designed for the inner sleeve (2), and process the end into a countersunk hole (11) matching the shoulder (21) at the end of the inner sleeve (2). The processed outer sleeve (1) does not need to be removed on the machine tool and is kept in reserve; S53, cleaning; cleaning the internal thread of the housing (1) and the external thread of the inner sleeve (2) for later use; S54, glue coating: evenly coating a layer of anaerobic glue on the internal threads of the outer shell (1) and the external threads of the inner sleeve (2); S55, assembly: screw the inner sleeve (2) coated with anaerobic adhesive into the outer sleeve (1), and position the shoulder (21) and the countersunk hole (11); S56, tightening: applying a certain pre-tightening force to the inner and outer threads by rotating the chuck (22), so that the outer shell (1) and the inner sleeve (2) are firmly connected together; S57, finishing processing: cutting off the chuck (22), processing the internal thread of the inner sleeve (2), and meeting the technical requirements of the finished product.

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