CN202571505U - Mechanical locating device for spiral track on numeral control thread-repairing lathe - Google Patents

Abstract

The utility model provides a mechanical locating device for a spiral track on a numeral control thread-repairing lathe. The mechanical locating device is characterized by comprising a lathe body, a tail platform, a lathe headstock and a bracket multi-group carrier roller, wherein the bracket multi-group carrier roller is arranged at one side of the lathe body; the lathe headstock and the tail platform are arranged on the lathe body; the tail platform can move forward and backward relative to the lathe headstock; the lathe headstock is provided with a main shaft; a front chuck is arranged at the front end of the main shaft, and a rear chuck is arranged at the rear end of the main shaft; and a locating spiral gauge is further arranged at one end of the tail platform, facing towards the lathe headstock. With the adoption of the mechanical locating device, the technical level, the quality level and the economic efficiency in repairing threads of a drilling rod are obviously improved.

Description

The Mechanical Positioning Device of the Helical Trajectory on the Numerical Control Thread Repairing Lathe

technical field

The utility model patent is used in the field of metal cutting and processing, and relates to an auxiliary positioning device for repairing and turning the old internal and external threads at both ends of long pipe workpieces such as used petroleum drill pipes and drill collars by a numerically controlled pipe thread lathe.

Background technique

In the petroleum and geological drilling industry, the drill bits that are drilled into the ground thousands of meters deep are composed of hundreds of drill pipes and drill collars, which are screwed one by one by the threads at both ends, and connected to the ground drilling rig. The ground drilling rig passes through these The drill pipe and drill collar transmit the torque to the drill bit. These drill pipes and drill collars need to be unloaded one by one after completing the drilling work of a well, recovered, repaired, and used repeatedly. In the maintenance work of drill pipes and drill collars, turning and repairing the inner and outer tapered joint threads at both ends is one of the most important tasks. Every year, a large number of tool joint threads need repair turning operations.

At present, people are all on mechanical pipe thread lathes to the repair turning processing of drill pipe joint thread at drill pipe, drill collar two ends, are finished by workman's manual operation. The reason for implementing the manual operation of the mechanical lathe to repair the turning taper thread is that the manual operation can easily adjust the tip of the tool to the groove of the thread, and then during the spiral movement of the tool relative to the workpiece, the two sides of the original triangular thread One side surface is evenly turned off one layer, and the rust, pitting, glue marks, scratches and stress fatigue layers are turned off to meet the processing requirements for thread repair. The advantages of this kind of mechanical repairing and turning tapered thread are: the radial cutting amount of the thread is small. According to the principle of the taper, the length and dimension of the drill pipe are reduced every time the thread is repaired, and the number of repairs of the drill pipe is increased. Rod life is extended.

In the field of machinery manufacturing, the use of CNC lathes to turn taper threads has obvious technical advantages over mechanical lathes, such as high thread precision, good surface quality, and high processing efficiency. Therefore, CNC lathes have been widely used in the manufacture and processing of new threads. In the existing CNC lathe turning thread function, as long as the thread parameters and tool installation position are determined, the spiral movement trajectory of the tool relative to the spindle of each lathe is fixed and inherent. The spiral trajectory is different, but this inherent spiral trajectory cannot be known by people only by their senses. It is precisely because of the inherent law of the helical trajectory that for old workpieces that are randomly clamped to the chuck of the lathe spindle, the helical line of the workpiece to be repaired does not coincide with the inherent cutting helical trajectory on the machine tool spindle, and the distance between the two helical lines The phase difference between them is random, and the tip of the tool cannot be processed along the groove of the old thread to be repaired, resulting in chaotic buckling. According to the current CNC lathe technology, the method of CNC thread repair is to remove all the old threads from the tooth root outwards, and re-turn new threads. The deficiencies of this technological level of CNC repairing turning tapered thread are: the radial cutting amount of the thread is large, the length and dimension of the drill pipe after turning are greatly reduced, the number of repairs of the drill pipe is reduced, and the economic benefit is not good. This is the only reason why CNC lathes cannot be directly applied to the field of old thread repair processing at present.

Contents of the invention

Purpose of the utility model: The utility model provides a mechanical positioning device and a positioning method for the helical track on the CNC thread repair lathe.

Technical solution : the utility model is realized through the following technical solutions:

A mechanical positioning device for a helical track on a CNC thread repair lathe, characterized in that the device mainly includes a bed, a tail table, a head box and multiple sets of idlers for a bracket; the multiple sets of idlers for the bracket are arranged on the On one side, the bed head box and the tail table are set on the bed, and the tail table can move back and forth relative to the bed head box; the bed head box is equipped with a main shaft, and the front and rear chucks are respectively set at the front and rear ends of the main shaft. The plate is also provided with a positioning thread gauge at the end of the tail table towards the headstock.

The positioning thread gauge has the same specifications as the thread of the drill pipe to be repaired, the internal and external matches, and the structure that can be screwed.

The tail table is set on the bed through slide rails, and one end of the tail table is provided with a hydraulic oil cylinder to propel its movement.

The positioning thread gauge is an external thread gauge or an internal thread gauge.

处停止，先后夹紧后卡盘和前卡盘，同时反转主轴并后退尾台，使工件与定位螺纹规脱开即可。 The mechanical positioning method for the helical track to be repaired on the workpiece implemented by the mechanical positioning device for the helical track on the above-mentioned numerically controlled thread repair lathe is characterized in that: the method uses a positioning thread gauge that can be screwed tightly with the workpiece to be repaired. To locate the workpiece, the specific steps of this method are as follows: insert the workpiece to be repaired into the hole of the machine tool spindle, and at the same time make the workpiece pass through the front and rear chucks, then push the tail table, and place the end of the workpiece between the positioning thread gauge The thread is tightened. At this time, the parameters such as the axial direction, radial direction and thread phase of the workpiece are determined by the positioning thread gauge, and the spindle is rotated to make it in the determined angular position.

Stop at the position, clamp the rear chuck and front chuck successively, reverse the main shaft and retreat the tail table at the same time, so that the workpiece can be disengaged from the positioning thread gauge.

角度处停止，

角度的确定方法如下： When the thread between the workpiece and the positioning thread gauge is tightened, the parameters such as the axial position, radial position and thread phase of the workpiece relative to the machine tool are determined by the positioning thread gauge. The known groove bottom helix on the thread gauge has a phase difference of 180°. At this time, the absolute position of the thread to be repaired on the workpiece relative to the lathe bed is known and determined; at this time, the existing CNC lathe spindle positioning stop function is used , make the spindle idle and fix the parameter point relative to the bed

stop at the angle,

The method of determining the angle is as follows:

  

为定位螺纹规槽底螺旋线相对于机床主轴位于0位处固有切削螺旋槽底轨迹的相位 in:

It is the phase of the inherent cutting helical groove bottom trajectory at the 0 position of the helical line of the groove bottom of the positioning thread gauge relative to the spindle of the machine tool

=0、1              

=0,1

＜360°   0 ≤

＜360°

0 ≤ ＜360°

角度值包含着定位螺纹规槽底螺旋线相对于主轴位于0位置处其固有切削螺旋槽底轨迹的相位差

和螺纹规与工件螺纹旋紧定位规律中内、外螺纹槽底之间相差180°相位等两个因素，并把主轴转动的绝对角度值

取值为360°范围内。 In the formula,

The angle value includes the phase difference of the bottom helix of the positioning screw gauge groove relative to the spindle at the 0 position of its inherent cutting helical groove bottom trajectory

And two factors such as the 180° phase difference between the internal and external thread groove bottoms in the thread gauge and the workpiece thread tightening and positioning law, and the absolute angle value of the spindle rotation

The value is within the range of 360°.

Advantages and effects :

The utility model provides a mechanical positioning device for a helical trajectory on a CNC thread repair lathe . The device is fixedly installed with a positioning thread gauge coaxial with the main shaft of the machine tool and of the same specification as the repaired turning thread at the front end of the tailstock. Install the internal thread gauge, and install the external thread gauge when processing the internal thread. The axial position of the thread gauge is determined by the position of the tail table on the tail table guide rail where it is installed, and its circumferential position is adjusted by the installation to adjust its relative to the tail table. determined by the angular phase. At this time, the phase β value of the thread groove bottom helix on the positioning thread gauge relative to the inherent thread groove bottom trajectory of the machine tool spindle is determined, and can be known by people through measurement.

The purpose of this utility model is to provide a mechanical thread positioning device and a positioning method that can locate the old thread of the drill pipe installed on the spindle chuck of the lathe, and it can determine the relative position of the old thread on each drill pipe that is clamped. All machine tools have fixed axial and circumferential positions. In this way, the thread line of the old drill pipe installed on the spindle chuck of the lathe coincides with the inherent cutting helical track on the spindle, creating conditions for the completion of CNC repairing of turning threads, and then achieving the goal of CNC repairing of turning threads. The CNC pipe thread lathe installed with the device of the utility model can realize the repair turning of the old thread. This lathe combines the advantages of high thread processing precision, good surface quality and high processing efficiency of the CNC lathe and the radial cutting amount of the thread repair of the mechanical lathe. The advantages of small size and small loss of drill pipe length are integrated into one. The utility model significantly improves the technical level, quality level and economic benefits of drill pipe thread repairing.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

The specific embodiment: the utility model is further described below in conjunction with the accompanying drawings:

As shown in Figure 1, the utility model provides a mechanical positioning device for the helical trajectory of the thread to be repaired on the workpiece in CNC thread repair turning, the device mainly includes a bed 1, a tail table 3, a bedside box 8 and multiple sets of brackets Idler roller 10; multiple sets of idler rollers 10 of the bracket are arranged on one side of the bed 1, the bedside box 8 and the tail table 3 are arranged on the bed 1, and the tail table 3 can move back and forth relative to the bedside box 8; The headstock 8 is horizontally installed with a main shaft 7 capable of rotating, and the front and rear chucks 6 and 9 are respectively arranged at the front and rear ends of the main shaft 7; One end of the platform 3 towards the head box 8 is provided with a positioning thread gauge 4;

The positioning screw gauge 4 is a structure that can be screwed tightly with the drill pipe thread to be repaired.

The positioning thread gauge is an external thread gauge or an internal thread gauge.

处停止，先后夹紧后卡盘9和前卡盘6，同时反转主轴7并后退尾台3，使工件5与定位螺纹规4脱开即可。 In addition, the utility model also provides a mechanical positioning method of the spiral track on the CNC thread repair lathe. The method is to locate the workpiece 5 by positioning the thread gauge 4. The specific steps of the method are as follows: the workpiece 5 to be repaired is penetrated into the In the hole of the main shaft 7, the workpiece 5 passes through the front and rear chucks at the same time, and then the tail table 3 is pushed forward by the hydraulic cylinder 2, and the thread between the end of the workpiece 5 and the positioning thread gauge is tightened. The axial, radial and circumferential positions are all determined by the positioning screw gauge 4, and the main shaft 7 is rotated to make it in the determined angular position.

Stop at the position, clamp the rear chuck 9 and the front chuck 6 successively, reverse the main shaft 7 and retreat the tail table 3 at the same time, so that the workpiece 5 can be disengaged from the positioning screw gauge 4.

Describe the method of the present utility model in detail below:

角度处停止，

角度的确定方法如下： When working, the workpiece to be repaired passes through the main shaft of the head box under the condition of multiple groups of rollers supported by the rear bracket of the machine tool, and the old thread to be repaired of the workpiece 5 is screwed onto the positioning thread gauge. At this time, the drill pipe is relatively Parameters such as the axial position, radial position and the circumferential phase of the thread of the machine tool are all determined by the positioning thread gauge. The phase difference of the helical line at the bottom of the old thread groove and the known helical line at the bottom of the groove on the thread gauge is 180°. The absolute position relative to the lathe bed is known and determined. Then use the existing CNC lathe spindle positioning stop function to make the spindle idle and fix the parameter point relative to the bed

stop at the angle,

The method of determining the angle is as follows:

  

为定位螺纹规槽底螺旋线相对于机床主轴位于0位处固有切削螺旋槽底轨迹的相位 in:

It is the phase of the inherent cutting helical groove bottom trajectory at the 0 position of the helical line of the groove bottom of the positioning thread gauge relative to the spindle of the machine tool

=0、1              

=0,1

＜360°   0 ≤

＜360°

＜360° 0 ≤

＜360°

角度值包含着定位螺纹规槽底螺旋线相对于主轴位于0位置处其固有切削螺旋槽底轨迹的相位差

和螺纹规与工件螺纹旋紧定位规律中内、外螺纹槽底之间相差180°相位等两个因素，并把主轴转动的绝对角度值

取值为360°范围内。 In the formula,

The angle value includes the phase difference of the bottom helix of the positioning screw gauge groove relative to the spindle at the 0 position of its inherent cutting helical groove bottom trajectory

And two factors such as the 180° phase difference between the internal and external thread groove bottoms in the thread gauge and the workpiece thread tightening and positioning law, and the absolute angle value of the spindle rotation

The value is within the range of 360°.

位置后，再按先夹紧后卡盘，后夹紧前卡盘的顺序夹紧钻杆工件。主轴反转，尾台后退，当工件螺纹全部从定位螺纹规中脱出、尾台退到后位后，需要修复车削螺纹的旧管子工件的螺纹定位装夹工作完成。此时，通过本实用新型装置的辅助定位以及上述的定位操作动作后，被夹紧到车床主轴卡盘上的任意钻杆、钻铤等已有螺纹工件上旧螺纹的螺旋线都与车床主轴上的固有切削螺旋轨迹相重合。由此保证在后续的螺纹车削过程中，刀尖可以对正待修复旧螺纹的凹槽中，在刀具与工件的螺旋相对车削运动中，保证待修复旧三角螺纹的两侧面能被刀具均匀地切去一层，到达修复螺纹的工作要求。 Spindle stops at

position, then clamp the drill pipe workpiece in the order of first clamping the rear chuck and then clamping the front chuck. The spindle reverses and the tail table retreats. When the workpiece threads are all out of the positioning thread gauge and the tail table retreats to the rear position, the thread positioning and clamping work of the old pipe workpiece that needs to be repaired and turned is completed. At this time, after the auxiliary positioning of the utility model device and the above-mentioned positioning operation action, the helix of the old thread on the existing threaded workpieces such as any drill pipe and drill collar clamped to the lathe spindle chuck is all aligned with the lathe spindle. coincides with the inherent cutting helical trajectory on the This ensures that in the subsequent thread turning process, the tool tip can be aligned with the groove of the old thread to be repaired, and in the helical relative turning movement between the tool and the workpiece, it is ensured that the two sides of the old triangular thread to be repaired can be evenly ground by the tool Cut off one layer to meet the work requirements of repairing the thread.

Claims (4)

1. a numerical control screw thread is repaired the mechanical positioner of helical trajectory on the lathe, it is characterized in that: this device comprises that mainly lathe bed ⑴, tail platform ⑶, headstock ⑻ and carriage organize carrying roller ⑽ more; Carriage is organized the side that carrying roller ⑽ is arranged on lathe bed ⑴ more, and headstock ⑻ and tail platform ⑶ are arranged on the lathe bed ⑴, moving before and after tail platform ⑶ can do with respect to headstock ⑻; Headstock ⑻ is provided with main shaft ⑺, and chuck ⑹ and back chuck ⑼ before the rear and front end of main shaft ⑺ is respectively arranged with also are provided with positioning threads rule ⑷ at tail platform ⑶ towards the end of headstock ⑻.

2. numerical control screw thread according to claim 1 is repaired the mechanical positioner of helical trajectory on the lathe, it is characterized in that: positioning threads rule ⑷ is for to have specification identical with the drill rod thread of being repaired, inside and outside match, can carry out the structure that screw thread is screwed.

3. numerical control screw thread according to claim 1 is repaired the mechanical positioner of helical trajectory on the lathe, and it is characterized in that: tail platform ⑶ is arranged on the lathe bed ⑴ through slide rail, and the end of tail platform ⑶ is provided with and advances its hydraulic jack ⑵ that moves.

4. numerical control screw thread according to claim 1 is repaired the mechanical positioner of helical trajectory on the lathe, it is characterized in that: said positioning threads rule are external screw thread rule or internal screw gauge.

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