Device and method for removing thread burrs by machining

Abstract

The present invention discloses a device and method for machining thread burrs removal, comprising a longitudinal turret power box and a rotating spindle installed in the longitudinal turret power box, a turret is fixedly provided at the front end of the rotating spindle, a deburring device is connected to the circumferential end surface of the turret by screwing or welding, a blade groove for installing a deburring blade is opened on the deburring device, a blade is embedded in the blade groove, the turret adopts 4, 8 or 12 stations, a mounting groove for installing a tool body frame is opened on the circumferential surface of the turret, the tool body frame is connected to the turret by screwing, the rotating spindle is located in the turret power box and can realize Y-direction movement, and the rotating spindle can drive the turret to rotate 360 ​​degrees through the power system of the machine tool, and the turret adopts any one of an electric turret, a hydraulic control or a servo turret.

Description

Technical Field

[0001] The invention relates to the technical field of machine tools, and in particular to a device and method for removing burrs during machining of a numerically controlled threading machine. Background Art

[0002] In the production process of finished petroleum casing, the quality of thread guide is an important factor to ensure thread connection and sealing.

[0003] Burrs are a common defect in cutting and one of the important factors affecting product quality. The burrs generated in the cutting of oil well pipe threads will directly affect the inspection accuracy of the thread size. In addition, during the thread connection process, the residual burrs are easy to scratch the thread surface and even cause sticking, which directly affects the service life of the oil well pipe. Therefore, oil well pipe manufacturers and users attach great importance to the removal of burrs on the ends of oil well pipes. The burrs in turning can be divided into burrs in the cutting feed direction and burrs in the cutting feed direction. The burrs in the cutting feed direction are larger and are an important factor affecting the size and shape and position accuracy of the parts. There are many factors that affect the formation of turning burrs, such as cutting speed, feed rate, cutting depth, tool rake angle, back angle, main deflection angle, tool tip arc radius, etc., and its mechanism of action is very complex.

[0004] Analyzing the root cause of burrs, burrs occur in the fracture separation stage, so the following focuses on the fracture separation stage: when the material undergoes the elastic deformation stage and the plastic deformation stage, and enters the fracture separation stage, when the material near the cutting edge reaches the limit strain and stress, the material cracks will occur. The starting point of the crack is the sheet material very close to the cutting edge on the side of the cutting edge. The crack starts from the side of the die and then occurs on the side of the punch edge. The upper and lower micro cracks that have been generated continue to press down with the punch. Under the action of compressive stress, they continue to expand into the interior of the sheet material along the direction of the maximum shear stress. When the gap is reasonable, the upper and lower cracks meet and overlap, and the sheet material is cut off and separated. Otherwise, burrs will be generated. Since it is difficult to reach a reasonable level of gap, burrs are inevitable during the cutting process.

[0005] Manual grinding and deburring is relatively primitive. It not only requires a lot of physical labor, but also seriously affects production efficiency and becomes an important bottleneck restricting the production rhythm. On the other hand, the effect of manual deburring cannot be compared with mechanical deburring, and it is easy to damage the complete thread. There is a risk of incomplete grinding, and stability and consistency cannot be guaranteed. Therefore, manual deburring will also pose a certain threat to product quality and is not recommended for mass production. Therefore, machining to remove burrs is the best solution. At present, the removal of burrs is to remove the thorns or flash generated by the cutting intersection of the coupling processing part. Although the burr of the coupling starting buckle is not large, it directly affects the connection performance of the coupling thread.

[0006] The differences in equipment and production processes of different manufacturers have resulted in differences in the order of burr removal or the installation position of the blade. In the process of thread turning machines, special burr cutters are usually used for removal. In addition, end blades or boring blades are used for burr removal, or sandblasting, phosphating and other methods are used. However, due to various reasons, the burr removal effect varies greatly. Before 2004, there was no requirement for deburring in API round thread processing. With the increasingly stringent technical requirements and fierce market competition of oil field manufacturers, more and more API round thread production contracts have added requirements for deburring processes. Most old-fashioned threading machines do not have deburring processes, so the tooling does not have the function of machining deburring.

[0007] The invention "a method for deburring steel surface" relates to a method for deburring steel surface, and belongs to the technical field of steel surface treatment. The invention "a method for cleaning burrs on thread surface" applies metallographic grinding paste mixed with gasoline or diesel on the processed thread surface, and repeatedly rotates and grinds through actual matching to clean the burrs on the thread surface. This method is particularly suitable for threads with small diameters and small pitches. The invention "a method for removing flash or burrs from the starting section of a workpiece thread on a CNC lathe" returns the turning tool to the starting point of the last cutting stroke of the thread after turning the thread on the workpiece; sets the amount of flash or burr removal by the turning tool; performs thread interpolation according to the original cutting parameters of the thread, turns the thread and positions the turning tool to the actual starting point of the thread; and performs equal lead thread interpolation along the chamfer direction of the starting section of the thread with the maximum lead of the sharp edge spiral to turn the flash or burr. The method for removing flash or burrs from the starting section of a workpiece thread on a CNC lathe can accurately remove the root of the flash or burr without changing the tool, thus eliminating the trouble of changing the tool. Summary of the invention

[0008] The purpose of the present invention is to design a device and method for machining thread burrs to solve the problems mentioned in the above background technology.

[0009] The objective of the present invention is achieved through the following technical solutions: a device for machining thread burrs removal, comprising a longitudinal turret power box and a rotating spindle installed in the longitudinal turret power box, a turret is fixedly provided at the front end of the rotating spindle, a deburring device is connected to the circumferential end surface of the turret by screwing or welding, a blade groove for installing a deburring blade is opened on the deburring device, and a blade groove is embedded with a blade;

[0010] The turret has 4, 8 or 12 stations. A mounting groove for mounting a tool body frame is provided on the circumferential surface of the turret. The tool body frame is connected to the turret by screwing.

[0011] Furthermore, the rotating spindle is located in the turret power box and can move in the Y direction, and the rotating spindle can drive the turret to rotate 360 ​​degrees through the power system of the machine tool.

[0012] Furthermore, the turret is any one of an electric turret, a hydraulically controlled turret or a servo turret.

[0013] Furthermore, the deburring device is a rod structure, and the deburring device is a burr cutter bar, on which a blade is inlaid according to different product requirements, and the blade can change the blade clamping angle.

[0014] Furthermore, the turret is connected to an equiposition plate by screwing or welding, and the equiposition plate is symmetrically provided with tool rods that can move relatively, and a hydraulic controller is fixed between the tool rods. The hydraulic controllers are relatively arranged, and the protruding ends of two symmetrical hydraulic controllers are arranged facing each other.

[0015] Furthermore, the front end of the tool rod is detachably connected to a circular tool body, and the circular tool body is expanded by a hydraulic controller, and the maximum expansion distance extends to 10-20 mm of the outer diameter of the tool turret.

[0016] Furthermore, the center position of the turret is connected to a positioning tool rod by screwing or welding, the upper end of the positioning tool rod is connected to an extension rod via a hydraulic control arm, and mutually symmetrical first cutting tool heads are fixedly provided on the lower opposite surfaces of the positioning tool rod.

[0017] Furthermore, second cutting blades which are symmetrical to each other are fixedly provided on opposite surfaces of the upper part of the extension rod.

[0018] Furthermore, the positioning knife bar and the blade are an integrated structure, the blade of the positioning knife bar is movably connected to a movable blade arranged crosswise at an angle, and the end of the movable blade is connected to a circular end by bolts;

[0019] The movable blade is disposed on the same side or both sides of the positioning blade rod;

[0020] The movable blade is fixed by bolts or hydraulic clamps.

[0021] A method for removing thread burrs by machining, comprising the following steps;

[0022] The first step is workpiece clamping;

[0023] Ensure that all positioning surfaces are clean and free of debris, and that all positioning surfaces are in close contact with the machine tool. The tool clamping process requires that the connecting nut be pre-tightened and tightened in two steps. To ensure accurate tool compensation, the machine tool center must be regularly calibrated.

[0024] The second step is to accurately align the tool;

[0025] When deburring, in order to ensure the correct position of the tool on the machine tool, the actual deviation of the burr cutter head is measured by a dial indicator, and then corresponding compensation is made during tool setting to make up for the initial error of the tool;

[0026] Cutting is performed by connecting a deburring device on the circumferential end surface of the turret by screwing or welding;

[0027] The third step is that during cutting, a blade groove for installing a deburrer is provided on the deburring device, a blade is embedded in the blade groove, and the tool compensation is set according to the type of the blade and the degree of matching of the thread;

[0028] The fourth step is to set the burr device to calculate the removal amount of the thread flash or burr to be processed;

[0029] Step 5: Based on the compilation of the deburring program, the deburring process adjustment range of +2mm to -2mm is obtained through tool compensation;

[0030] Step 6: After deep processing of the thread teeth, the thread circumference is modified by the positioning tool rod;

[0031] The blade body is movably connected to a movable blade body arranged crosswise at an angle, and the end of the movable blade body is connected to a circular blade head by means of bolts, so that the thread surface is scraped and deburred by the arranged circular blade head.

[0032] Compared with the prior art, the beneficial effect of the present invention is that the technical solution adopted by the present invention to solve the technical problem is that in order to solve the technical problem that the machine tool has no machining deburring capability, the method of modifying the cutter head and adding a deburring program is adopted. By combining communication with the tool manufacturer and actual on-site production, the original threading cutter head is modified to add a burr cutter bar, the machining program is improved, and the burr machining program is added, so that the CNC machine tool can complete the deburring machining process.

[0033] The present invention can greatly improve the quality of thread guides and the yield rate of thread turning, which can increase the economic benefits by about RMB 480,000 per year. In addition, it can reduce the time of operators for large-scale manual grinding of burrs and improve production capacity. Calculated by reducing the downtime by 20 hours per month, it can reduce 240 hours per year, increase the production of couplings by 10 per hour, and increase the output by 2,400 per year, which can increase the economic benefits by about RMB 480,000. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0035] Figure 2 It is a schematic diagram of the longitudinal turret power box and the rotating spindle of the present invention;

[0036] Figure 3 is a schematic diagram of a turret and a deburring device in another state of the present invention;

[0037] Figure 4 It is a schematic diagram of positioning the knife bar and the knife body of the present invention;

[0038] Figure 5 It is a schematic diagram of the connection between the positioning tool rod and the equal position plate of the present invention. DETAILED DESCRIPTION

[0039] 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, rather than all the embodiments. 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.

[0040] like Figure 1-5 As shown, a device for machining thread burrs removal comprises a longitudinal turret power box 1 and a rotating spindle 2 installed in the longitudinal turret power box 1, a turret 3 is fixedly provided at the front end of the rotating spindle 2, a deburring device 4 is connected to the circumferential end surface of the turret 3 by screwing or welding, a blade groove for installing a deburring blade is opened on the deburring device 4, and a blade 5 is embedded in the blade groove;

[0041] The turret 3 has 4, 8 or 12 stations. A mounting groove for mounting a tool body frame is provided on the circumferential surface of the turret 3. The tool body frame is connected to the turret 3 by screwing.

[0042] like Figure 1 As shown, in the use state, the turret adopts a separate burr device, and the blades on the burr device are set at different angles, and the set angles are operated according to the amount of burrs.

[0043] In order to facilitate the direction adjustment during use and not just limit the movement in the X-axis direction, a further preferred embodiment of the present invention is that the rotating spindle 2 is located in the turret power box 1 and can move in the Y direction, and the rotating spindle 2 can drive the turret 3 to rotate 360 ​​degrees through the power system of the machine tool.

[0044] In order to facilitate the control of the turret when in use, a further preferred embodiment of the present invention is that the turret 3 is any one of an electric turret, a hydraulic control or a servo turret.

[0045] In order to facilitate the need for burr processing in use, a further preferred embodiment of the present invention is that the deburring device 4 is a rod structure, and the deburring device 4 is a burr tool rod. The burr tool rod is inlaid with a blade 5 according to different product requirements, and the blade 5 can change the blade clamping angle.

[0046] When in use, the need for processing and deburring threads of different specifications can be met by providing a detachable and replaceable blade.

[0047] In order to facilitate effective adjustment for unequal distances and separate use during use, a further preferred embodiment of the present invention is that the turret 3 is connected to an equiposition plate 6 by screwing or welding, and the equiposition plate 6 is symmetrically provided with tool rods 7 that can move relatively to each other, and a hydraulic controller is fixed between the tool rods 7. The hydraulic controllers are arranged relatively to each other, and the protruding ends of the two symmetrical hydraulic controllers are arranged facing each other.

[0048] In order to facilitate different types of processing during use, a further preferred embodiment of the present invention is that the front end of the tool rod 7 is detachably connected to the circular tool body 8, and the circular tool body 8 is expanded by a hydraulic controller, and the maximum expansion distance extends to 10-20 mm of the outer diameter of the turret 3.

[0049] The front end of the knife rod 7 is detachably connected to knife bodies of different types, one of which is a circular knife body 8 and the other is a triangular knife body.

[0050] The tool rods 7 are symmetrically arranged and connected with a separate hydraulic control rod. According to different usage requirements, any one of the separate tool rods 7 can be used to work. Different arrangements of the tool rods 7 achieve different processing purposes.

[0051] In order to facilitate integrated processing during use, a further preferred embodiment of the present invention is that the center position of the turret 3 is connected to the positioning tool rod 11 by screwing or welding, the positioning tool rod 11 is connected to the equal position plate, the upper end of the positioning tool rod 11 is connected to the extension rod 12 through a hydraulic control arm, and the lower opposite surfaces of the positioning tool rod 11 are fixed with mutually symmetrical first cutting heads 15.

[0052] The use of the first cutting tool head 15 can achieve overall cutting, and the tool compensation value of the first cutting tool head 15 is adjusted by the machine tool during use;

[0053] The upper end of the positioning tool rod 11 is connected to the extension rod 12 through a hydraulic control arm. The circular tool head on the extension rod 12 has a larger diameter and can realize the grinding of the straight pipe section after the thread extension section is threaded.

[0054] In order to facilitate the processing of the extension end of the pipe body for docking in use and facilitate the use of the pipe body for docking, a further preferred embodiment of the present invention is that second cutting heads 14 that are symmetrical to each other are fixed on opposite surfaces of the upper part of the extension rod 12.

[0055] The diameter of the second cutting head 14 is greater than that of the first cutting head 15 . In use, the second cutting head 14 and the first cutting head 15 use different tool compensation values.

[0056] In order to facilitate the removal of burrs on the tip of the thread circumference when in use, a further preferred embodiment of the present invention is that the positioning tool rod 11 and the blade body 10 are an integral structure, the blade body 10 of the positioning tool rod 11 is movably connected to a movable blade body 13 arranged at an angle and cross-arranged, and the end position of the movable blade body 13 is connected to the circular end by bolts;

[0057] The movable blade 13 is disposed on the same side or both sides of the positioning blade rod 11;

[0058] The movable blade body 13 is fixed by bolts or hydraulic clamps.

[0059] A method for removing thread burrs by machining, comprising the following steps;

[0060] The first step is workpiece clamping;

[0061] Ensure that all positioning surfaces are clean and free of debris, and that all positioning surfaces are in close contact with the machine tool. The tool clamping process requires that the connecting nut be pre-tightened and tightened in two steps. To ensure accurate tool compensation, the machine tool center must be regularly calibrated.

[0062] The second step is to accurately align the tool;

[0063] When deburring, in order to ensure the correct position of the tool on the machine tool, the actual deviation of the burr cutter head is measured by a dial indicator, and then corresponding compensation is made during tool setting to make up for the initial error of the tool;

[0064] Cutting is performed by connecting the deburring device 4 on the circumferential end surface of the turret 3 by screwing or welding;

[0065] The third step is that during cutting, a blade groove for installing a deburrer is provided on the deburring device 4, a blade 5 is embedded in the blade groove, and the tool compensation is set according to the model of the blade 5 and the degree of matching with the thread;

[0066] The fourth step is to set the burr device 4 to calculate the amount of cutting of the thread flash or burr to be processed;

[0067] Step 5: Based on the compilation of the deburring program, the deburring process adjustment range of +2mm to -2mm is obtained through tool compensation;

[0068] Step 6: After deep processing of the thread teeth, the thread circumference is modified by the positioning tool rod 11;

[0069] The blade body 10 is movably connected to a movable blade body 13 arranged crosswise at an angle, and the end of the movable blade body 13 is connected to a circular blade head by bolts, so that the thread surface is scraped and deburred by the arranged circular blade head.

[0070] A deburring tool bar is installed on the free station of the turret. This type of deburring tool bar can change the blade clamping angle according to different product requirements to meet the requirements of burr removal of different types and angles, and then add a deburring program to the processing program. The deburring function is achieved through mechanical processing. When deburring with the burr tool bar,

[0071] It is best to perform program simulation and calculation on the software or drawing, and adjust the appropriate entry angle, otherwise it is easy to cause burrs to turn inward or the removal effect is not ideal. Use a deburring blade to remove burrs.

[0072] After repeated exploration and practice on site, and after successful application of deburring for many steel grades and buckle types, various deburring programs for thread production were compiled according to specifications and buckle types, and the programs were saved and called at any time in production. The requirement that the thread lead burrs must be polished clean as required by the contract was solved, while the workload of manual grinding by operators was reduced, greatly improving work efficiency.

[0073] The specific methods and steps are as follows: Based on the compilation of the deburring program, we obtained the adjustment range of +2mm to -2mm for the deburring process through tool compensation. As long as the operator controls the tool compensation and adjusts the cutting depth in time, the degree of deburring can be accurately controlled. Under the original method, if we want to know the cutting depth of each tool, we can only measure it after turning. If we adjust it after turning to the bottom, there is little turning amount left, and the adjustment can only be fine-tuning, and even if it can be adjusted, it can only be adjusted once or twice. In this case, we need to control the tool compensation setting to obtain the best thread guide quality.

[0074] How to ensure the best deburring effect: first, accurate tool alignment; second, clamping of workpiece and tool; and third, tool compensation during turning.

[0075] Accurate tool setting: Due to the years of use of the tool holder on the machine tool, a slight deviation in accuracy will affect the processing effect. When deburring, in order to ensure the correct position of the tool on the machine tool, the actual deviation of the burr cutter head is measured by a dial indicator, and then compensated accordingly during tool setting to make up for the initial error of the tool.

[0076] How to clamp correctly: After years of work experience, our operators have been able to correctly master the installation of burr tools, as follows: When clamping the workpiece, it is necessary to ensure that all positioning surfaces are clean and free of debris, and that all positioning surfaces are in close contact with the machine tool positioning. The tool clamping process requires that the connecting nut be pre-tightened and tightened in two steps. To ensure accurate tool compensation, the machine tool center must be calibrated regularly.

[0077] How to accurately compensate the tool during deburring: The wear of the machine tool and the deviation of the tool holder make the tool compensation value inaccurate. In order to perform tool compensation more accurately, we require the operator to perform excess compensation, that is, to ensure that the tool compensation adjustment has excess to effectively avoid the generation of scrap.

[0078] Because deburring is done in a small range of thread guide, it can be completed quickly in tens of seconds, and the quality of thread guide can be guaranteed with a small processing volume. Because the bayonet we use is a triangular tool, after reasonably selecting the cutting speed to ensure that the bayonet does not hit the knife, the advantage of using the three sides of the bayonet can be realized. In field practice, according to different steel grades and buckle types, the three sides of a bayonet can produce 200 to 500 couplings.

[0079] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0080] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for machining and removing thread burrs, characterized in that: It comprises a longitudinal turret power box (1) and a rotating spindle (2) installed in the longitudinal turret power box (1), a turret (3) is fixedly provided at the front end of the rotating spindle (2), a deburring device (4) is connected to the circumferential end surface of the turret (3) by screwing or welding, the deburring device (4) is provided with a blade groove for installing a deburring blade, and a blade (5) is embedded in the blade groove; The turret (3) has 4, 8 or 12 stations, and a mounting groove for mounting a tool body frame is provided on the circumferential surface of the turret (3). The tool body frame is connected to the turret (3) by screwing; The rotating spindle (2) is located in the turret power box (1) and can move in the Y direction, and the rotating spindle (2) can drive the turret (3) to rotate 360 ​​degrees through the power system of the machine tool; The deburring device (4) is a rod structure, and the deburring device (4) is a burring knife rod, on which a blade (5) is inlaid according to different product requirements, and the blade (5) can change the blade clamping angle; The turret (3) is connected to an equal-position plate (6) by screwing or welding, and the equal-position plate (6) is symmetrically provided with relatively movable tool rods (7), and a hydraulic controller is fixedly provided between the tool rods (7), and the hydraulic controllers are arranged relative to each other, and the extended ends of the two symmetrical hydraulic controllers are arranged facing each other; The center position of the turret (3) is connected to a positioning tool rod (11) by screwing or welding, the upper end of the positioning tool rod (11) is connected to an extension rod (12) via a hydraulic control arm, and mutually symmetrical first cutting tool heads (15) are fixedly provided on the lower opposite surfaces of the positioning tool rod (11); Second cutting blades (14) that are symmetrical to each other are fixedly provided on opposite surfaces of the upper part of the extension rod (12); The diameter of the second cutting blade head (14) is greater than the diameter of the first cutting blade head (15).

2. The device for machining and removing thread burrs according to claim 1, characterized in that: The turret (3) is any one of an electric turret, a hydraulically controlled turret or a servo turret.

3. The device for machining and removing thread burrs according to claim 2, characterized in that: The front end of the knife rod (7) is detachably connected to a circular knife body (8), and the circular knife body (8) is expanded by a hydraulic controller, with the maximum expansion distance extending to 10-20 mm of the outer diameter of the knife tower (3).

4. The device for machining and removing thread burrs according to claim 3, characterized in that: The positioning knife rod (11) and the blade (10) are an integral structure, the blade (10) of the positioning knife rod (11) is movably connected to a movable blade (13) arranged crosswise at an angle, and the end of the movable blade (13) is connected to a circular blade head by means of bolts; The movable blade (13) is located in the middle of the positioning blade rod (11); The movable blade body (13) is fixed by bolts or hydraulic clamps.

5. The application method of the device for machining thread burr removal according to claim 4, characterized in that: The method comprises the following steps: The first step is workpiece clamping; Ensure that all positioning surfaces are clean and free of debris, and that all positioning surfaces are in close contact with the machine tool. The tool clamping process requires that the connecting nut be pre-tightened and tightened in two steps. To ensure accurate tool compensation, the machine tool center must be regularly calibrated. The second step is to accurately align the tool; When deburring, in order to ensure the correct position of the tool on the machine tool, the actual deviation of the burr cutter head is measured by a dial indicator, and then corresponding compensation is made during tool setting to make up for the initial error of the tool; Cutting is performed by connecting a deburring device (4) on the circumferential end surface of the turret (3) by screwing or welding; The third step is to set the tool compensation by opening a blade slot for installing the deburring device (4) during cutting, wherein a blade (5) is embedded in the blade slot, and the model of the blade (5) and the degree of matching of the thread are used to set the tool compensation; The fourth step is to set a burr removal device (4) to calculate the amount of burr or burr removed from the thread to be processed; Step 5: Based on the compilation of the deburring program, the deburring process adjustment range of +2mm to -2mm is obtained through tool compensation; Step 6, after deep processing of the thread teeth, the thread circumference is modified by using the positioning tool rod (11); The blade body (10) is movably connected to a movable blade body (13) arranged crosswise at an angle, and the end of the movable blade body (13) is connected to a circular blade head by means of bolts, so that the thread surface is scraped and deburred by the arranged circular blade head.

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