阅读说明：本技术 一种反转钻杆的加工工艺 (Machining process of reverse drill rod ) 是由 蒋开勇 张凌 王清峰 杨林 王军发 褚立虎 田乐意 何飞 杨兰 李勇 邱响林 于 2021-08-20 设计创作，主要内容包括：本发明属于矿用钻具加工工艺领域,涉及一种反转钻杆的加工工艺,提供一种加工方便、快捷、钻杆使用寿命长、安全可靠的反转钻杆,任意两只钻杆首尾连接后最深牙嵌槽A1和最长齿A2相对角度公差≦±5°,该加工方法无需相位摩擦焊接设备、高精密数控车床,其钻杆内外螺纹相对角度控制方便、可靠性高,解决了原反转钻杆加工周期长、生产成本高、牙嵌槽干涉、旋向控制不准、质量问题频发等工艺技术缺陷,提高了反转钻杆的尺寸精度及使用寿命,可直接应用于矿用钻机卡盘及夹持器联动工作,钻孔钻进、反转工作效率极高。(The invention belongs to the field of machining processes of mining drilling tools, relates to a machining process of a reverse drill rod, and provides the reverse drill rod which is convenient and quick to machine, long in service life of the drill rod, safe and reliable.)

1. The machining process of the reversal drill rod is characterized by comprising the following steps of:

s1, processing and assembling; after all parts of the drill rod are processed, the parts are assembled and connected through friction welding, and the drill rod body is subjected to finish turning treatment after weld heat treatment;

s2, scribing; adjusting the horizontal straightness of the drill rod on a bench worker working platform, and using a height gauge to horizontally scribe the center position of the excircle of the drill rod main body to require the center lines of two ends of the drill rod main body to be overlapped;

s3, counting the external threads of the vehicle; using a numerical control pipe threading lathe, performing table drilling to align an excircle, performing numerical turning on the left end face of a drill rod main body, removing the allowance of 0.5mm, performing excircle conical surface turning, using a taper ring gauge for inspection, controlling the excircle conicity size of a male connector, performing outer spigot opening, chamfering by 1 multiplied by 45 degrees, using a female buckle datum tool for assembling and turning male connector external threads, and requiring the center line of the female buckle datum tool to coincide with the center line of the excircle surface of the drill rod main body to finish the finish turning of the male connector external threads;

S4, counting internal threads; in order to conveniently clamp the outer circle of the drill rod main body, a pipe threading lathe is used for clamping the outer circle of a female buckle, a meter is drawn for aligning the outer circle, the right end face of the drill rod main body is firstly turned to ensure the total length size, the inner spigot is turned to reach the size, the inner conical surface is turned, the conical plug gauge is used for checking, the root part of the inner spigot is chamfered by 45 degrees, the inner conical thread is turned by using a male buckle datum tool assembly, the central line of the male buckle datum tool is required to be coincident with the central line of the surface of the outer circle of the drill rod main body, and the finish turning of the internal thread of the female joint is completed;

s5, milling a spline; the drill rod main body and the box reference tool are screwed, a machining center is used, alignment is conducted according to the reference line of the outer circle surface of the drill rod main body and the reference plane of the combined box reference tool, one clamping and one pushing are conducted, the spline is roughly and finely milled according to the requirement of a diagram, and the requirements of the size precision, the surface roughness and the position degree of the spline are guaranteed;

s6, milling a tooth caulking groove: using a machining center, screwing a male buckle reference tool into the female joint end of the drill rod main body, aligning according to the reference line of the excircle surface of the drill rod main body and the reference plane of the combined male buckle reference tool, aligning and coinciding the center line of the drill rod main body and the reference line of the male buckle reference tool, clamping the excircle of the drill rod female buckle at the moment, dismounting the male buckle reference tool, milling the tooth caulking groove according to the scale of a diagram, and ensuring the requirements of the size precision, the surface roughness and the position degree of the tooth caulking groove;

S7, post-processing; after the tooth caulking grooves are milled, the relative angle tolerance between the deepest tooth caulking groove A1 and the longest tooth A2 is guaranteed to be less than or equal to +/-5 degrees, and the drill rod is subjected to subsequent fine processing, so that the machining of the reverse drill rod is completed.

2. The machining process of the reversal drill rod as claimed in claim 1, wherein the machining process comprises the following steps: in the step S3, in order to control the ending position of the thread when the external thread is finish-turned, the external thread needs to be assembled by using a box reference tool, so that the reference line of the box reference tool coincides with the reference line of the surface of the outer circle of the drill rod main body, thereby controlling the ending position of the thread at the male joint end of the drill rod main body.

3. The machining process of the reversal drill rod as claimed in claim 1, wherein the machining process comprises the following steps: in the step S3, a numerical control pipe threading lathe is adopted, the machining efficiency and the machining precision are high, the external thread of the male joint is machined by adopting a 60-degree thread forming blade, the taper, the thread pitch, the thread form angle and the thread azimuth angle of the male joint are detected by using a taper ring gauge and a female buckle reference tool, and the product quality is guaranteed.

4. The machining process of the reversal drill rod as claimed in claim 1, wherein the machining process comprises the following steps: and S4, checking by using a taper plug gauge, ensuring that the taper size is in the plug gauge step size control range, ensuring that the taper with the contact spot more than or equal to 90 percent is qualified, and simultaneously requiring that the datum line of the pin reference tool is superposed with the central line of the outer circle surface of the drill rod main body after the processed internal thread is screwed with the pin reference tool.

5. The machining process of the reversal drill rod as claimed in claim 1, wherein the machining process comprises the following steps: and S4, after the internal thread processed by the inspection requirement of the pin joint reference tool is screwed with the pin buckle reference tool, the reference line of the pin buckle reference tool is superposed with the central line of the drill rod main body, so that the ending position of the end thread of the female joint of the drill rod main body is controlled, the reference lines of any two screwed drill rods are completely superposed, and the interchangeability of the drill rods is realized.

6. The machining process of the reversal drill rod as claimed in claim 1, wherein the machining process comprises the following steps: and S5, screwing the drill rod main body and the box reference tool, aligning the drill rod main body and the box reference tool by using a machining center according to the reference line of the excircle surface of the drill rod main body and the reference plane of the combined box reference tool, clamping the drill rod main body and the box reference tool one by one, indexing and roughly and finely milling the spline according to the requirements of the drawing, and ensuring the requirements of the size precision, the surface roughness and the position degree of the spline.

7. The machining process of the reversal drill rod as claimed in claim 1, wherein the machining process comprises the following steps: and S6, screwing a pin reference tool into the female joint end of the drill rod main body by using a machining center, aligning according to the reference line of the outer circle surface of the drill rod main body and the reference plane of the combined pin reference tool, aligning and coinciding the center line of the drill rod main body and the reference line of the pin reference tool, clamping the outer circle of the drill rod female buckle, dismounting the pin reference tool, milling the tooth caulking groove according to the scale of the drawing, and ensuring the requirements of the size precision, the surface roughness and the position degree of the tooth caulking groove.

Technical Field

The invention belongs to the field of machining processes of mining drilling tools, and relates to a machining process of a reverse drill rod.

Background

The quality of the reversal drill rod is directly dependent on the processing technology of the reversal drill rod. The reverse drill rod is a new product recently developed by our institute, and according to the structure diagram of the reverse drill rod, the current machining only has a continuously-driven friction welding machine to weld the drill rod main body, so that the phase-free friction welding machine does not process; meanwhile, the drawing technology requires that the relative angle tolerance of the deepest jaw A1 and the longest tooth A2 of the reverse drill rod is less than or equal to +/-5 degrees, a numerical control pipe threading lathe with high use precision still cannot accurately control the thread tightness distance and the thread ending position at two ends of the drill rod, all components are assembled according to a drawing after machining is completed, after any two drill rods are screwed, the relative angle tolerance of the deepest jaw A1 and the longest tooth A2 far exceeds +/-5 degrees, and the deepest tooth cannot be normally embedded into the longest tooth, namely the reverse function cannot be normally realized. By combining the processing equipment and the existing process conditions, the design requirement that the relative angle of the reversal drill rod is less than or equal to +/-5 degrees cannot be realized, and the production of the reversal drill rod is greatly inhibited.

The original process route has the following defects: (1) the machining of the threads of the male joint and the female joint is random, two drill rods machined at will cannot be interchanged, the thread turning direction cannot be ensured, and the azimuth angle of the jaw groove is seriously out of tolerance; (2) because the design requirements cannot be met, the trial production failure rate is high, and the production cost is high; (3) the male joint and the female joint are in threaded engagement, and after two end surfaces are attached, the phenomenon of dislocation of the tooth embedding grooves is serious, and the product quality is unstable; (4) the processing efficiency is low.

Disclosure of Invention

In view of the above, the present invention provides a machining process for a reverse drill rod, and provides a process method with convenient and fast machining, long service life of the drill rod, and high reliability.

In order to achieve the purpose, the invention provides the following technical scheme: a machining process of a reversal drill rod specifically comprises the following steps:

s1, processing and assembling; after all parts of the drill rod are processed, the parts are assembled and connected through friction welding, and the drill rod body is subjected to finish turning treatment after weld heat treatment;

s2, scribing; adjusting the horizontal straightness of the drill rod on a bench worker working platform, and using a height gauge to horizontally scribe the center position of the excircle of the drill rod main body to require the center lines of two ends of the drill rod main body to be overlapped;

S3, counting the external threads of the vehicle; using a numerical control pipe threading lathe, performing table drilling to align an excircle, performing numerical turning on the left end face of a drill rod main body, removing the allowance of 0.5mm, performing excircle conical surface turning, using a taper ring gauge for inspection, controlling the excircle conicity size of a male connector, performing outer spigot opening, chamfering by 1 multiplied by 45 degrees, using a female buckle datum tool for assembling and turning male connector external threads, and requiring the center line of the female buckle datum tool to coincide with the center line of the excircle surface of the drill rod main body to finish the finish turning of the male connector external threads;

s4, counting internal threads; in order to conveniently clamp the outer circle of the drill rod main body, a pipe threading lathe is used for clamping the outer circle of a female buckle, a meter is drawn for aligning the outer circle, the right end face of the drill rod main body is firstly turned to ensure the total length size, the inner spigot is turned to reach the size, the inner conical surface is turned, the conical plug gauge is used for checking, the root part of the inner spigot is chamfered by 45 degrees, the inner conical thread is turned by using a male buckle datum tool assembly, the central line of the male buckle datum tool is required to be coincident with the central line of the surface of the outer circle of the drill rod main body, and the finish turning of the internal thread of the female joint is completed;

s5, milling a spline; the drill rod main body and the box reference tool are screwed, a machining center is used, alignment is conducted according to the reference line of the outer circle surface of the drill rod main body and the reference plane of the combined box reference tool, one clamping and one pushing are conducted, the spline is roughly and finely milled according to the requirement of a diagram, and the requirements of the size precision, the surface roughness and the position degree of the spline are guaranteed;

S6, milling a tooth caulking groove: using a machining center, screwing a male buckle reference tool into the female joint end of the drill rod main body, aligning according to the reference line of the excircle surface of the drill rod main body and the reference plane of the combined male buckle reference tool, aligning and coinciding the center line of the drill rod main body and the reference line of the male buckle reference tool, clamping the excircle of the drill rod female buckle at the moment, dismounting the male buckle reference tool, milling the tooth caulking groove according to the scale of a diagram, and ensuring the requirements of the size precision, the surface roughness and the position degree of the tooth caulking groove;

s7, post-processing; after the tooth caulking grooves are milled, the relative angle tolerance between the deepest tooth caulking groove A1 and the longest tooth A2 is guaranteed to be less than or equal to +/-5 degrees, and the drill rod is subjected to subsequent fine processing, so that the machining of the reverse drill rod is completed.

Optionally, in the step S3, in order to control the ending position of the thread during finish turning of the thread, a box reference tool needs to be used to make the reference line of the box reference tool coincide with the reference line of the outer circumferential surface of the drill rod main body.

Optionally, in the step S3, a numerical control pipe threading lathe is adopted, the machining efficiency and precision are high, the external thread of the male joint is machined by adopting a 60-degree thread forming blade, and the taper, the thread pitch, the thread form angle and the thread azimuth angle of the male joint are detected by using a taper ring gauge and a box reference tool, so that the product quality is ensured.

Optionally, in the step S4, a taper plug gauge is used for inspection, and the tool reference line coincides with the drill rod main body outer circle surface reference line after the processed internal thread and the pin buckle reference tool are screwed together, so as to ensure that the taper size is within the plug gauge step size control range, and more than or equal to 90% of contact spots are qualified.

Optionally, in the step S4, the reference line of the tool after screwing the internal thread processed by the inspection requirement of the pin joint reference tool and the pin buckle reference tool coincides with the center line of the outer circle surface of the drill rod main body, so that the reference lines coincide after screwing any two drill rods, and exchange is realized.

Optionally, in the step S5, the drill rod main body and the box reference tool are screwed together, and a machining center is used to align the reference line of the outer circle surface of the drill rod main body and the reference plane of the combined box reference tool, and the spline is roughly and finely milled by one clamp according to the indexing requirements, so as to ensure the requirements of the dimensional accuracy, the surface roughness and the position degree of the spline;

optionally, in the step S6, a machining center is used, the pin reference tool is screwed into the female connector end of the drill rod main body, the alignment is performed according to the reference line of the outer circle surface of the drill rod main body and the reference plane of the combined pin reference tool, the center line of the drill rod main body is aligned and coincided with the reference line of the pin reference tool, the outer circle of the drill rod female is clamped, the pin reference tool is dismounted, the tooth caulking groove is milled in an indexing manner according to the diagram, and the requirements of the tooth caulking groove on dimensional accuracy, surface roughness and position degree are met.

The invention has the beneficial effects that: the invention relates to a reverse drill rod and a processing technology thereof, the reverse drill rod has high strength, small error of thread pitch of turned threads, high roughness of thread surfaces and small error of azimuth angles of tooth sockets, avoids various defects and quality problems of phase friction welding and common pipe thread lathe processing, enhances the adaptability, simplifies the processing technology, reduces the high cost of newly purchased equipment or outsourcing processing, ensures the connection strength of the threads of a drill rod joint and the embedding degree of the tooth sockets, improves the service performance of the reverse drill rod, and the reverse drill rod processed according to the technology has good product quality, long service life, safety and reliability.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a cross-sectional view of a reversing drill rod of the present invention;

FIG. 2 is a front view of a reversing drill rod of the present invention;

FIG. 3 is a flow chart of a reverse drill pipe machining process of the present invention;

FIG. 4 is a schematic structural view of a male buckle reference tool of the present invention;

fig. 5 is a schematic structural view of the female snap datum fixture of the present invention.

Reference numerals: the connecting sleeve comprises a connecting sleeve 1, a connecting plate 2, a male joint 3, a pipe body 4, a central push rod 5 and a female joint 6;

a1: dental impression, a 2: the connecting sleeve tooth is embedded.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 2, the reverse drill rod is manufactured by the above-mentioned reverse drill rod processing technology, and includes a pipe body 4, a female joint 6 and a male joint 3 disposed at two ends of the pipe body 4, a connecting sleeve 1 and a connecting plate 2 disposed outside the male joint 3, and a central push rod 5 penetrating the pipe body 4, wherein an external thread is disposed outside the male joint 3, an internal thread matched with the external thread of the male joint 3 is disposed in the female joint 6, the central push rod 5 is slidably disposed in the pipe body 4, and drives the connecting sleeve 1 to move axially through the connecting plate 2, a connecting sleeve tooth cog is disposed on the connecting sleeve 1, and a cog groove a1 matched with the connecting sleeve tooth cog a2 is disposed at an outer end of the female joint 6.

The working principle is as follows: after any two reverse drill rods are screwed, the small end of the male joint 3 pushes a central push rod 5 in the drill rod body to drive the connecting plate 2 and the connecting sleeve 1 to axially and horizontally move towards the end of the male joint 3, the connecting sleeve tooth A2 is axially slid to be matched with the deepest tooth inserting groove A1 of the female joint 6, the interlocking function is realized, and the reverse drill rods can be driven to drill and pull up in a forward and reverse mode through the rotation of the power head and the clamp holder.

Referring to fig. 3, a process for machining a reverse drill rod includes the following steps:

s1, processing and assembling; after all parts of the drill rod are processed, the parts are assembled and connected through friction welding, and the drill rod body is subjected to finish turning treatment after weld heat treatment; in the present embodiment, the step S1 is common general knowledge and is conventional technology, and will not be described herein (the details are briefly described with reference to fig. 3);

s2, scribing; adjusting the horizontal straightness of the drill rod on a bench worker working platform, and using a height gauge to horizontally scribe the center position of the excircle of the drill rod main body to require the center lines of two ends of the drill rod main body to be overlapped;

s3, counting the external threads of the vehicle; using a numerical control pipe threading lathe, performing table drilling to align an excircle, performing numerical turning on the left end face of a drill rod main body, removing the allowance of 0.5mm, performing excircle conical surface turning, using a taper ring gauge for inspection, controlling the excircle conicity size of a male connector, performing outer spigot opening, chamfering by 1 multiplied by 45 degrees, using a female buckle datum tool for assembling and turning male connector external threads, and requiring the center line of the female buckle datum tool to coincide with the center line of the excircle surface of the drill rod main body to finish the finish turning of the male connector external threads;

The numerical control pipe threading lathe is adopted, the processing efficiency and the processing precision are high, the external thread of the turning male connector 3 is processed by adopting a 60-degree thread forming blade, and the taper, the thread pitch, the thread form angle and the thread azimuth angle of the turning male connector are detected by using a taper ring gauge and a box reference tool, so that the product quality is ensured;

s4, counting internal threads; in order to conveniently clamp the outer circle of the drill rod main body, a pipe threading lathe is used for clamping the outer circle of a female buckle, a meter is drawn for aligning the outer circle, the right end face of the drill rod main body is firstly turned to ensure the total length size, the inner spigot is turned to reach the size, the inner conical surface is turned, the conical plug gauge is used for checking, the root part of the inner spigot is chamfered by 45 degrees, the inner conical thread is turned by using a male buckle datum tool assembly, the central line of the male buckle datum tool is required to be coincident with the central line of the surface of the outer circle of the drill rod main body, and the finish turning of the internal thread of the female joint is completed;

the numerical control pipe threading lathe is adopted, the machining efficiency and the machining precision are high, the internal thread of the turning female joint 6 is machined by adopting a 60-degree thread forming blade, and the taper, the thread pitch, the thread form angle and the thread azimuth angle of the internal thread are detected by using a taper plug gauge and a male buckle reference tool, so that the product quality is ensured;

s5, milling a spline; the drill rod main body and the box reference tool are screwed, a machining center is used, alignment is conducted according to the reference line of the outer circle surface of the drill rod main body and the reference plane of the combined box reference tool, one clamping and one pushing are conducted, the spline is roughly and finely milled according to the requirement of a diagram, and the requirements of the size precision, the surface roughness and the position degree of the spline are guaranteed;

S6, milling a tooth caulking groove: using a machining center, screwing a male buckle reference tool into the female joint end of the drill rod main body, aligning according to the reference line of the excircle surface of the drill rod main body and the reference plane of the combined male buckle reference tool, aligning and coinciding the center line of the drill rod main body and the reference line of the male buckle reference tool, clamping the excircle of the drill rod female buckle at the moment, dismounting the male buckle reference tool, milling the tooth caulking groove according to the scale of a diagram, and ensuring the requirements of the size precision, the surface roughness and the position degree of the tooth caulking groove;

s7, post-processing; after the tooth caulking grooves are milled, the relative angle tolerance between the deepest tooth caulking groove A1 and the longest tooth A2 is guaranteed to be less than or equal to +/-5 degrees, and the drill rod is subjected to subsequent fine processing, so that the machining of the reverse drill rod is completed.

In the present embodiment, the step S7 further includes steps of milling square holes, welding, painting, etc., which are common knowledge and conventional technologies, and will not be described herein (refer to the brief step of fig. 3).

Please refer to fig. 4-5, which illustrate a male buckle reference tool and a female buckle reference tool.

The internal and external threads at two ends are turned in the invention (1) by adopting a numerical control pipe thread lathe to turn the threads, the average error of the thread pitch of the threads is +/-0.02 mm and is less than the tolerance value requirement, the error in the whole length of the threads is also less than the tolerance value by 0.1mm, the tightness distance is easy to control, the precision is high, and the roughness of the surface of the threads also reaches the national standard; (2) the relative angle error between the deepest jaw A1 and the longest tooth A2 after any two reverse drill rods are screwed is ensured to be less than or equal to +/-5 degrees, and the product quality is improved; (3) and the reversed drill rod male joint 3 and the reversed drill rod female joint 6 are respectively processed by adopting a female buckle reference tool and male buckle reference tool collinear method, so that the consistency of thread ending at two ends of the drill rod main body is ensured.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.