A thread axis gauge and thread part processing technology thereof

Abstract

This patent relates to the technical field of threaded hole position detection, specifically a thread axis gauge and a threaded portion processing technology thereof, a thread axis gauge comprising a threaded portion, a polished rod portion and a mounting portion, the threaded portion, the polished rod portion and the mounting portion are connected in sequence, the polished rod portion is cylindrical, and the polished rod portion is coaxial with the threaded portion, the threaded portion comprises a threaded through end, a threaded gradient section and a threaded stop end arranged in sequence, the threaded stop end is connected to the polished rod portion, and the median diameter of the threaded through end is d 2通 The median diameter of the thread stop is d 2止 The middle diameter of the thread gradient section changes gradually from the middle diameter of the thread through end to the middle diameter of the thread stop end. When the threaded part of this scheme is screwed into the threaded hole, the axial clearance is continuously eliminated by the cooperation of the thread middle diameter, and the thread axis is found, and then the three-coordinate detection is carried out to determine the position error of the threaded hole.

Description

Technical Field

[0001] The invention relates to the technical field of threaded hole position detection, in particular to a thread axis gauge and a threaded part processing technology thereof. Background Art

[0002] Threaded connection is a widely used connection method, so the detection of threaded hole position is particularly important. Currently, the detection of threaded hole position is mainly carried out in the following three ways:

[0003] The first method is to use three-coordinate measurement to directly evaluate points on the surface of the threaded hole, that is, to use a three-coordinate probe to measure points in the X and Y directions of the threaded inner hole, and fit a circle through the three-coordinate system software, and find the center of the circle, so as to evaluate the position relative to the reference. This method has the problem of large point measurement errors, because the probe may take the maximum value or the minimum value when measuring points on the threaded inner hole, and the consistency of the point measurement values ​​is poor.

[0004] The second method is to use a threaded through-end mandrel for auxiliary measurement and evaluation, that is, to make a corresponding threaded mandrel according to the specifications of the threaded hole, and the center diameter size of the mandrel is grouped according to the thread fit grade. At present, each thread specification mandrel in the market is grouped into 4 groups. In actual use, they are screwed into the threaded holes respectively, and the threaded mandrel with a smaller fit clearance is selected based on human subjective judgment, and then the position evaluation and detection is carried out in conjunction with the three coordinates. This method has the problem of too many threaded mandrels and relatively chaotic management. Secondly, the fit clearance is selected based on human subjective judgment during use, and there is a large human judgment error, which causes the final result to deviate from the actual size.

[0005] The third method is to use a comprehensive inspection tool to determine whether the threaded hole position is qualified, that is, to make a corresponding comprehensive inspection tool according to the product threaded hole position coordinates, and then place the product on the comprehensive inspection tool and use the polished rod mandrel to insert the threaded hole. If it can be successfully inserted into the threaded hole, it is judged to be qualified, otherwise it is unqualified. However, this detection method has the problem of difficulty in manufacturing comprehensive inspection tools and the accuracy of the inspection tool itself exceeding the tolerance. Secondly, this method can only determine whether the product position is qualified, and cannot determine the deviation data of the specific direction position relative to the theoretical size. Summary of the invention

[0006] The present invention is intended to provide a thread axis gauge and a thread portion processing technology thereof to solve the problems raised in the background technology.

[0007] In order to achieve the above object, the basic scheme of the present invention is as follows:

[0008] A thread axis gauge comprises a threaded portion, a polished rod portion and a mounting portion, wherein the threaded portion, the polished rod portion and the mounting portion are connected in sequence, the polished rod portion is cylindrical, and the polished rod portion is coaxial with the threaded portion, the threaded portion comprises a threaded through end, a threaded gradual section and a threaded stop end which are arranged in sequence, the threaded stop end is connected to the polished rod portion, the threaded through end, the threaded gradual section and the threaded stop end have a pitch of P, the major diameters of the threaded through end, the threaded gradual section and the threaded stop end are all d, the minor diameters of the threaded through end, the threaded gradual section and the threaded stop end are all E, and the median diameter of the threaded through end is d 2通 The median diameter of the thread stop is d 2止 The mid-diameter of the thread gradient section changes from the mid-diameter of the thread through end to the mid-diameter of the thread stop end, and the thread surfaces of the thread through end, the thread gradient section and the thread stop end facing the polished rod portion all have a mid-diameter of d 2止 The thread surface has a length of 1.5×d, wherein the length of the thread through end is 0.9×d, the length of the thread stop end is 1.5×P, and the remaining part of the thread portion is a thread gradient section.

[0009] Beneficial effects of the basic scheme: (1) When the threaded part of this scheme is screwed into the threaded hole, the axial clearance is continuously eliminated by matching the thread center diameter, and the thread axis is found, and then the three-coordinate detection is carried out to determine the position error of the threaded hole.

[0010] (2) In this scheme, the threaded part has both a threaded through end and a threaded stop end, and the threaded through end and the threaded stop end are connected together by a thread gradient section. Therefore, only one thread axis gauge is needed for each thread specification to meet the requirements, thereby reducing the number of management and eliminating the clearance error caused by human subjective judgment.

[0011] (3) This solution can accurately find the axis centerline of the threaded hole, because the front end of the thread axis gauge of the present invention is the threaded part, and the rear end is the smooth rod part, and the smooth rod part and the threaded part are coaxial. Therefore, the axis centerline can be accurately found after the thread axis gauge is locked. Finally, the three-coordinate system is used to sample points on the smooth rod part, and the center of the circle is found after software fitting, and the position error of the thread relative to the reference is evaluated.

[0012] Furthermore, the ends of the threaded portion and the mounting portion are both provided with a center hole coaxial with the polished rod and the threaded portion. The coaxial center hole facilitates processing of the threaded portion and ensures the coaxiality of the threaded portion and the polished rod.

[0013] Furthermore, the length of the mounting portion is 5 mm. This solution is a specific selection of the basic solution.

[0014] A threaded portion machining process of a thread axis gauge comprises the following steps:

[0015] Step 1: Prepare the rough machining thread axis gauge, which includes the part to be machined, the polished rod part and the installation part, and then perform quenching and tempering to make the surface hardness of the rough machining thread axis gauge reach 56-58HRC;

[0016] Step 2: Grinding: Grind the thread end to a large diameter of d, a small diameter of E, and a middle diameter of d 2止 , a thread segment with a pitch of P and a length of 1.5×d;

[0017] Step 3: Grind out the finished product, grind the thread surface of the thread segment ground in step 2 that is away from the polished rod part, and grind out the thread end, thread gradient section and thread stop end.

[0018] The beneficial effects of this solution are as follows: (1) This solution first performs quenching and tempering, which increases the surface hardness of the rough-machined thread axis gauge, making the threaded portion more durable and wear-resistant, thereby extending its service life.

[0019] (2) This scheme first grinds the entire threaded portion according to the parameters of the thread stop, and then grinds the thread surface facing away from the polished rod according to the specific parameters of the thread through end and the thread gradient section, so that the thread through end, the thread gradient section, and the thread stop meet the specified parameter requirements, but the thread surface of the entire threaded portion facing the polished rod remains consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axial cross-sectional view of an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. 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.

[0022] The reference numerals in the drawings of the specification include: a polished rod portion 1, a mounting portion 2, a center hole 3, a threaded through end 4, a threaded gradual section 5, and a threaded stop end 6.

[0023] Example

[0024] Basically as attached Figure 1 As shown: A thread axis gauge includes a threaded portion, a polished rod portion 1 and a mounting portion 2, the threaded portion, the polished rod portion 1 and the mounting portion 2 are connected in sequence, the polished rod portion 1 is cylindrical, and the polished rod portion 1 is coaxial with the threaded portion, and the ends of the threaded portion and the mounting portion 2 are both provided with a center hole 3 coaxial with the polished rod portion 1 and the threaded portion, and the length of the mounting portion 2 is 5 mm.

[0025] The threaded portion includes a threaded through end 4, a threaded gradual section 5 and a threaded stop end 6 which are arranged in sequence. The threaded stop end 6 is connected to the polished rod portion 1. The threaded through end 4, the threaded gradual section 5 and the threaded stop end 6 have a pitch of P. The major diameters of the threaded through end 4, the threaded gradual section 5 and the threaded stop end 6 are all d. The minor diameters of the threaded through end 4, the threaded gradual section 5 and the threaded stop end 6 are all E. The median diameter of the threaded through end 4 is d. 2通 , the median diameter of the thread stop 6 is d 2止 The mid-diameter of the thread gradient section 5 gradually changes from the mid-diameter of the thread through end 4 to the mid-diameter of the thread stop end 6. The thread surfaces of the thread through end 4, the thread gradient section 5 and the thread stop end 6 facing the polished rod portion 1 all have a mid-diameter of d 2止 The thread surface has a thread portion length of 1.5×d, of which the length of the thread through end 4 is 0.9×d, the length of the thread stop end 6 is 1.5×P, and the remaining part of the thread portion is the thread transition section 5. 2通 ,d 2止 They are all set according to the parameters of the threaded hole to be detected, and are not specifically described in this embodiment.

[0026] The specific implementation process is as follows: when using, first select the corresponding thread axis gauge according to the thread specifications of the product to be tested; then hold the top mounting part 2, slowly screw the threaded part of the thread axis gauge into the threaded hole to the thread end 6, and lock the thread axis gauge; finally, use the three-coordinate system to sample points on the polished rod part 1 of the thread axis gauge, and the software automatically fits the center of the circle or the axis centerline to evaluate the position tolerance of the threaded hole.

[0027] A threaded portion machining process of a thread axis gauge comprises the following steps:

[0028] Step 1: Prepare the rough-machined thread axis gauge, including the part to be processed, the polished rod part and the installation part, and then quench and temper it to make the surface hardness of the rough-machined thread axis gauge reach 56-58HRC;

[0029] Step 2: Grinding: Grind the thread end to a large diameter of d, a small diameter of E, and a middle diameter of d 2止 , a thread segment with a pitch of P and a length of 1.5×d;

[0030] Step 3: Grind out the finished product, grind the thread surface of the thread segment ground in step 2 that is away from the polished rod part, and grind out the thread end, thread gradient section and thread stop end.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A thread axis gauge, characterized in that: The invention comprises a threaded portion, a polished rod portion and a mounting portion, wherein the threaded portion, the polished rod portion and the mounting portion are connected in sequence, the polished rod portion is cylindrical, and the polished rod portion is coaxial with the threaded portion, the threaded portion comprises a threaded through end, a threaded gradual section and a threaded stop end which are arranged in sequence, the threaded stop end is connected to the polished rod portion, the threaded through end, the threaded gradual section and the threaded stop end have a pitch of P, the major diameters of the threaded through end, the threaded gradual section and the threaded stop end are all d, the minor diameters of the threaded through end, the threaded gradual section and the threaded stop end are all E, and the median diameter of the threaded through end is d 2通 The median diameter of the thread stop is d 2止 The mid-diameter of the thread gradient section changes from the mid-diameter of the thread through end to the mid-diameter of the thread stop end, and the thread surfaces of the thread through end, the thread gradient section and the thread stop end facing the polished rod portion all have a mid-diameter of d 2止 The thread surface has a length of 1.5×d, wherein the length of the thread through end is 0.9×d, the length of the thread stop end is 1.5×P, and the remaining part of the thread portion is a thread gradient section.

2. A thread axis gauge according to claim 1, characterized in that: The end of the threaded portion and the end of the mounting portion are both provided with a central hole coaxial with the polished rod portion and the threaded portion.

3. A thread axis gauge according to claim 2, characterized in that: The mounting portion is a rectangular parallelepiped, and the center point of the mounting portion falls on the axis of the polished rod portion.

4. A thread axis gauge according to claim 3, characterized in that: The length of the mounting portion is 5 mm.

5. The threaded portion processing process of a thread axis gauge according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Prepare the rough machining thread axis gauge, which includes the part to be machined, the polished rod part and the installation part, and then perform quenching and tempering to make the surface hardness of the rough machining thread axis gauge reach 56-58HRC; Step 2: Grinding: Grind the thread end to a large diameter of d, a small diameter of E, and a middle diameter of d 2止 , a thread segment with a pitch of P and a length of 1.5×d; Step 3: Grind out the finished product, grind the thread surface of the thread segment ground in step 2 that is away from the polished rod part, and grind out the thread end, thread gradient section and thread stop end.

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