Regular triangle indexable trace petroleum pipe thread cutter and machining method thereof

Abstract

The invention relates to the technical field of tool machining, and discloses a regular triangle indexable trace petroleum pipe thread tool and a machining method thereof, workblank design and regular triangle three positioning surface design are adopted, the diameter precision of an inscribed circle is + / -0.015-0.025 mm, and the concentricity deviation between the circle center of the inscribed circle and the circle center of a workblank hole is smaller than or equal to 0.1 mm; the absolute value of the difference between any two of the vertical distances from the circle center of the blank hole to the three positioning surfaces is less than or equal to 0.1 mm, and the tolerance of the included angle between any two positioning surfaces is + / -7 '; the thickness single-side allowance and the rake face allowance are both 0.1-0.15 mm; the allowance of the tooth shape in each direction is 0.08 to 0.15 mm; pressing and forming blanks in batches by using a high-precision mold, and directly forming three positioning edges (surfaces); and removing all allowances through one-time tooth profile finish machining and one-time rake face finish machining micro grinding to obtain the regular triangle indexable micro petroleum pipe thread cutter. According to the scheme, tool design, die, profiling and grinding technologies are combined, the batch cost is obviously reduced, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of tool processing, in particular to an equilateral triangle indexable micro-petroleum pipe thread tool and a processing method thereof. Background Art

[0002] The regular triangle structure is a common cutting tool structure (such as Figure 1 As shown in the middle forming tool 1, it has a forming tooth shape 11 and a forming positioning surface 12), which is characterized by reliable positioning, high cost performance, and convenient use. It has a high application rate in the field of thread tools.

[0003] Because the tooth shape of oil pipe threading tools is complex and has high precision, such as the linear accuracy of the tooth shape reaches ±0.01mm, and the angle accuracy reaches ±10′ (such as Figure 2 As shown in the figure), the accuracy after indexing is required to remain unchanged, which puts forward higher requirements on the processing of the three positioning edges (surfaces) of the tool (as shown in the figure). Figure 3 As shown), if the tolerance of the angle (60°) of the locating edge (surface) is within ±7′, the tolerance of the inscribed circle diameter of the three locating edges (surfaces) is ±0.015mm and the concentricity deviation with the center of the blank hole is ≤0.1mm, the microscopic linearity of the three locating edges (surfaces) can only be concave, and the middle is convex, it is unqualified.

[0004] In actual production, the above precision is mainly achieved by CNC peripheral grinders, the unit price of which fluctuates between 1 million and 7 million yuan, plus labor costs, the total cost remains high. If ordinary equipment is used for processing, the efficiency and precision cannot meet the requirements.

[0005] On the other hand, tool manufacturing is a process of blank-fine blank-product. Due to the limited mold technology and pressing technology, the blank in the original technology has two defects: one is that the margin is large, usually the peripheral grinding amount exceeds 0.3mm, which is time-consuming and labor-intensive; the other is that it does not have morphological characteristics (such as Figure 4 As shown in the existing blank without morphological features 2), one blank can be adapted to a variety of tools, and the tooth grinding amount is large. Usually, two rough grinding processes and one fine grinding process are required to complete the tooth processing. With the advancement of mold and pressing technology, although the blank begins to have morphological features (blank with tooth shape) to reduce the grinding amount, it is still difficult to control the precision. In order to compensate for the uncertainty of interference factors in precision control, the tooth margin is still set large, exceeding 0.3mm. Summary of the invention

[0006] The present invention aims to provide an equilateral triangle indexable micro-petroleum pipe thread tool and a processing method thereof, which deeply integrates tool design, mold technology, profiling technology and grinding technology, solves the problems of tooth shape and front cutting edge grinding caused by mold and pressing technology, and more creatively directly presses the three positioning edges (surfaces) of the equilateral triangle into shape, saving peripheral processes, greatly reducing the cost of terminal products, greatly improving production efficiency, and gaining certain advantages in market competition, especially in overseas markets.

[0007] The basic scheme provided by the present invention is: a method for machining a regular triangle indexable micro-petroleum pipe thread tool, the method comprising:

[0008] S100, blank design, including:

[0009] S101, design of three locating surfaces of equilateral triangle, including the diameter accuracy of the inscribed circle is ±(0.015~0.025)mm, the concentricity deviation between the center of the inscribed circle and the center of the blank hole is ≤0.1mm, the absolute value of the difference between any two of the vertical distances from the center of the blank hole to the three locating surfaces is ≤0.15mm, and the angle tolerance between any two locating surfaces is ±7′;

[0010] S102, thickness and rake face design, including thickness single side allowance and rake face allowance are 0.1~0.15mm;

[0011] S103, tooth shape design, including the allowance in all directions of the tooth shape is 0.08~0.15mm;

[0012] S200 uses high-precision molds to batch press blanks. A single blank meets the blank design requirements of S100, and the three peripheral surfaces of the blank are directly used as three positioning surfaces without grinding;

[0013] S300, according to the design of each allowance in S100, the blank is subjected to one tooth profile finishing and one rake face finishing to remove all allowances, thereby obtaining the equilateral triangle indexable micro oil pipe thread tool.

[0014] The present invention also provides an equilateral triangle indexable micro-petroleum pipe thread cutter, which is formed by the equilateral triangle indexable micro-petroleum pipe thread cutter processing method.

[0015] The working principle and advantages of the present invention are:

[0016] The technical difficulties in solving the above existing defects mainly focus on how to achieve high precision of the blank to reduce or completely eliminate the allowance. In essence, it is to achieve more refined blank molding through mold design and pressing process, and finally manufacture the terminal product efficiently and at low cost. By realizing the deep integration of tool design, mold technology, pressing technology and grinding technology, a new solution is provided to improve the production efficiency and product quality of regular triangle indexable micro-petroleum pipe thread tools and reduce production costs.

[0017] After analysis, it was found that although the equilateral triangle structure is common in oil pipe threading tools, the micro-grinding process has not yet been applied, and there is a lack of experience in mass production, especially in the case of direct pressing and forming of three-position peripheries (surfaces). There are many technical difficulties and practical challenges behind this.

[0018] Since the working environment of oil pipe thread tools is extremely harsh, they need to have high strength, wear resistance and other characteristics, which puts higher requirements on the selection and processing of materials. However, these special materials are often difficult to efficiently process with large margins through traditional grinding processes, and need to be completed in multiple grindings, which is time-consuming and labor-intensive. In addition, the technical difficulty of three-position peripheral direct pressing is extremely high. It not only needs to solve the problem of complex mold design, but also needs to ensure that the material is evenly distributed and defect-free during the pressing process, which poses severe challenges to both mold manufacturing technology and molding technology. Under the existing technical conditions, there are still great difficulties in accurately controlling the pressure, temperature and material flow direction during the pressing process, which can easily lead to problems such as low yield and unstable quality. Furthermore, the lack of practical experience in mass production means that the relevant process parameter optimization and quality control system are not yet mature, which further limits its large-scale promotion and application. In summary, the above factors jointly restrict the application and development of micro-grinding process and direct pressing technology in oil pipe thread tools.

[0019] This scheme creatively proposes micro-grinding for oil pipe threading tools. The difficulty lies in three "micro-grindings": 1. There is no margin around, and it is directly formed; 2. The tooth shape margin is very small; 3. The front cutting edge margin is very small (the thickness direction is the normal grinding amount). Although the grinding process of tiny margins can be completed by existing mature technologies, the difficulty of the micro-grinding proposed in this scheme lies in how to achieve the three micro-grindings on the blank without affecting the normal performance of the tool. It is obtained through long-term exploration and analysis of the actual production situation on site, and comprehensive consideration of materials, molds, pressing processes and control technologies. Collaborative innovation and breakthroughs are achieved. Compared with traditional processing, this scheme has obvious advantages in the creative three "micro-grinding" designs for oil pipe threading tools.

[0020] In addition, during the blank design stage, this solution accurately controls key dimensions such as blank accuracy and allowance, achieving the goal of high precision and low allowance. In particular, the design of the triangular three-positioning surface directly meets the molding requirements, and the tooth shape and rake face design adopts a small allowance method. The blank meets the high-precision requirements and ensures stability and reliability during subsequent processing. It is particularly worth mentioning that, using the existing high-precision molds and pressing technology, the triangular three-positioning edges (surfaces) can be directly formed during the blank forming process, and can be directly used as the positioning reference for subsequent processing and application. No additional grinding process is required, and the indexing accuracy is comparable to traditional grinding. After the blank is formed, only a small allowance fine grinding process is required for the tooth shape, rake face and thickness to complete the entire manufacturing process, simplifying the production process, greatly improving production efficiency and reducing costs, while also ensuring the high quality and consistency of the final product, and having no negative impact on the life of the finished product. In addition, this solution can cover the two main thread types of round thread and trapezoidal thread at the same time to meet the needs of different application scenarios.

[0021] Compared with the existing technology, this solution not only solves many problems existing in traditional processes, such as complex grinding processes, difficult-to-control precision, and high manufacturing costs, but also demonstrates excellent performance in practical applications by deeply integrating tool design, mold technology, profiling technology, and grinding technology. This integrated solution makes the entire production process more efficient and accurate, greatly improving the yield rate and product quality. At the same time, with the advantages of low cost and high efficiency, it also lays a solid foundation for subsequent market promotion. Overall, this solution not only breaks through the limitations of existing technologies, but the specific and detailed design of key dimensions also reflects the rationality and feasibility of this innovative method. It is also of great significance to improve the overall technical level of the tool manufacturing industry and provide new ideas and directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the regular triangle structure of an existing oil pipe threading tool;

[0023] Figure 2 This is a schematic diagram of the tooth profile dimensions of existing oil pipe threading tools;

[0024] Figure 3 A schematic diagram of the positioning peripheral accuracy of an existing equilateral triangle indexable tool;

[0025] Figure 4 It is a schematic diagram of the blank allowance without morphological features of the existing equilateral triangle indexable tool;

[0026] Figure 5 A partial precision schematic diagram of the tooth profile of an equilateral triangle indexable micro-petroleum pipe thread tool blank provided by an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of a regular triangle indexable micro-petroleum pipe threading tool with tooth profile and rake face blank provided by an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the peripheral accuracy of an equilateral triangle indexable micro-petroleum pipe threading tool provided by an embodiment of the present invention;

[0029] Figure 8 A schematic diagram of the thickness and rake face allowance of a regular triangle indexable micro-petroleum pipe thread tool blank provided by an embodiment of the present invention;

[0030] Fig. 9 A schematic diagram of the residual distribution of the regular triangle indexable micro-petroleum pipe trapezoidal thread tool blank provided by an embodiment of the present invention;

[0031] Fig.10 A schematic diagram of the residual distribution of a regular triangle indexable micro-petroleum pipe round thread tool blank provided by an embodiment of the present invention;

[0032] Fig.11 A schematic diagram of the accuracy requirements for removing the end face allowance of an equilateral triangle indexable micro-petroleum pipe thread tool blank provided by an embodiment of the present invention;

[0033] Fig.12 A schematic diagram of removing tooth profile allowance from a regular triangle indexable micro-petroleum pipe thread tool blank provided by an embodiment of the present invention;

[0034] Fig.13 A schematic diagram of removing the rake face allowance of an equilateral triangle indexable micro-petroleum pipe thread tool blank provided by an embodiment of the present invention;

[0035] The marks in the drawings of the specification include: forming tool 1, forming tooth profile 11, forming positioning surface 12, existing non-morphological feature blank 2, blank 3, tooth profile 31, front cutting surface 32, second fixture 4, forming grinding wheel 1 41, third fixture 5, forming grinding wheel 2 51. DETAILED DESCRIPTION

[0036] The following is a further detailed description through specific implementation methods:

[0037] The embodiment is basically as shown in the attached Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown: a method for machining a regular triangle indexable micro-petroleum pipe thread tool, the method comprises the following steps, wherein the blank 3, the blank tooth shape 31, and the blank rake face 32 represent the regular triangle indexable micro-petroleum pipe thread tool blank in this scheme, Figure 6 (a) is a schematic diagram of the rough tooth shape. Figure 6 (b) is a schematic diagram of the front cutting edge.

[0038] S100, blank 3 design, determine the accuracy of the regular triangle blank 3, ensure that it can reach the CNC peripheral grinding level, including:

[0039] S101, such as Figure 7 As shown, the design of the three locating surfaces of the equilateral triangle, including the inscribed circle diameter accuracy requirement is ±(0.015~0.025)mm, and the centroid deviation between the center of the inscribed circle and the center of the blank hole is required to be ≤0.1mm, that is, the position error of the center of the inscribed circle must be controlled within a circle with a diameter of 0.1mm centered on the center of the blank hole. The absolute value of the difference between any two of the vertical distances from the center of the blank hole to the three locating surfaces (such as K1, K2, and K3) is ≤0.15mm; in this embodiment, to further ensure accuracy, the absolute value of the difference between any two K values ​​is ≤0.1mm. The tolerance of the angle (60°) between any two locating surfaces is ±7′, such as Figure 7 The equilateral triangle indexable thread cutter generally has three specifications with side lengths of 16mm, 22mm, and 27mm, and the corresponding inscribed circle diameters are Φ9.525mm, Φ12.7mm, and Φ15.875mm, respectively, and can be designed according to the above requirements.

[0040] This solution comprehensively considers the existing mold technology, pressing technology and grinding technology, and combines the actual positioning requirements of the tool to directly press and form the three positioning edges (surfaces) of the equilateral triangle. The indexing accuracy reaches the grinding level, and also lays the foundation for the large-scale application of micro-grinding in equilateral triangle indexable petroleum pipe thread tools.

[0041] S102, thickness and rake face 32 design, including thickness single-side allowance and rake face 32 allowance are both 0.1-0.15mm;

[0042] Similarly, taking the three specifications of inscribed circle diameter Φ9.525mm, Φ12.7mm, and Φ15.875mm as examples, the finished product thicknesses are 3.18mm, 4.76mm, and 6.35mm respectively. In this embodiment, the remaining amount is set as follows Figure 8 As shown, the corresponding values ​​are shown in Table 1, Table 2, and Table 3. The single-side thickness allowance is set to 0.1-0.15 mm; the front cutting edge 32 allowance is set to 0.1-0.15 mm, the inner thread can be understood as an internal thread, and the outer thread can be understood as an external thread.

[0043] Table 1 Example of allowance design for tool blank and finished product with inscribed circle diameter Φ9.525mm

[0044]

[0045] Table 2 Example of allowance design for tool blank and finished product with inscribed circle diameter Φ12.7mm

[0046]

[0047] Table 3 Example of allowance design for tool blank and finished product with inscribed circle diameter Φ15.875mm

[0048]

[0049] S103, design of tooth profile 31, including the allowance of tooth profile 31 in all directions is 0.08-0.15mm;

[0050] This solution is mainly for oil pipe thread tools, which can cover two main threads: round thread and trapezoidal thread. Each corner of the triangle is a cutting edge, and each cutting edge has a cutting tooth. The allowance is divided into tooth top allowance, tooth bottom allowance and tooth side allowance. Fig. 9 and Fig.10 As shown. The tooth shape 31 part is enlarged on the tooth top, tooth bottom and tooth side according to their respective characteristics. The allowance in each direction is designed to be 0.08-0.15mm, and the maximum cannot exceed 0.15mm. The allowance setting is shown in Table 4.

[0051] Table 4 Design examples of round thread and trapezoidal tool allowance

[0052] Residue classification Round thread(mm) Trapezoidal thread (mm) Addendum 0.08～0.15 0.08～0.15 Gear bottom allowance 0.08～0.15 0.08～0.15 Tooth side allowance 0.08～0.15 0.08～0.15

[0053] On the basis of the existing high-precision mold and pressing technology that can directly press and form the three positioning surfaces of an equilateral triangle, the above-mentioned allowance design can be obtained simultaneously with the aforementioned technology, greatly reducing the blank allowance.

[0054] S200, using a high-precision mold to batch-press and form blanks 3, a single blank 3 meets the blank design requirements in S100, and the three peripheral surfaces of the blank are directly used as three positioning surfaces without grinding, that is, the regular triangle three positioning surfaces of the blank 3 meet the forming requirements of the regular triangle three positioning surfaces required for the forming of the regular triangle indexable micro-petroleum pipe thread tool;

[0055] 3R mold technology is used to manufacture high-precision molds. The linear dimension accuracy of the mold reaches ±0.03mm, the angle accuracy reaches ±20′, and the linear accuracy of the tooth shape reaches ±0.03mm when adding complex tooth shapes.

[0056] The steps of batch pressing and forming the blanks 3 include preparing a cemented carbide mixture, pressing the blanks and sintering the blanks.

[0057] In the process of preparing cemented carbide mixture, cemented carbide is mixed according to the formula, and evenly stirred by ball milling process, and the ball milling time is 70 to 100 hours; spray granulation is carried out by using a spray tower, and the spraying time is about 1 ton of a batch of materials, and the time is 24 hours;

[0058] In the blank pressing process, an electric press is used with a pressure range of 4 to 4.5 tons. When 10,000 pieces are loaded into the furnace at a time, the pressing time is 70 to 100 hours.

[0059] During the sintering process of the blank, a low-pressure sintering furnace is used for sintering at a temperature of 1400-1500° and a sintering time of 20-50 hours.

[0060] Under the comprehensive application of blank design, high-precision molds and pressing process optimization in this scheme, the precision of the blanks formed by batch pressing is not lower than the precision of peripheral grinding, which is mainly reflected in the accuracy of the diameter of the inscribed circle reaching ±(0.015-0.025)mm, and the concentricity deviation between the center of the inscribed circle and the center of the blank hole is ≤0.1mm, that is, the position error of the center of the inscribed circle is controlled within a circle with a diameter of 0.1mm centered on the center of the blank hole; the vertical distance from the center of the blank hole to the three positioning edges (surfaces) is K1, K2, and K3, and the absolute value of the difference between any two of the three is ≤0.1mm; the tolerance of the angle (60°) between any two positioning edges is ±7′. Figure 5 The linear accuracy of the rough tooth shape obtained by this scheme can reach ±0.05mm, and the angular accuracy can reach ±20′.

[0061] S300, according to the design of each allowance in S100, the blank 3 is subjected to a tooth profile finishing process and a front cutting face finishing process to remove the allowance and form the tool, thereby obtaining the equilateral triangle indexable micro oil pipe thread tool. The steps include:

[0062] After removing the end face allowance, according to the single-side allowance design of the thickness, the first machine tool is used. The grinding allowance accuracy of the two end faces is ±0.01mm, the thickness accuracy is ±0.02mm, the parallelism of the two end faces is ≤0.01, and the flatness error is 0.005.

[0063] To remove the tooth profile allowance, a second machine tool is used, using a profiled grinding wheel 41 for fine grinding, with a preset feed speed, and removal in one pass.

[0064] To remove the excess on the front cutting edge, a third machine tool is used, and a forming grinding wheel 251 is used for fine grinding. The feed speed is preset and the cutting is removed in one pass.

[0065] like Fig.11 As shown, Taking the regular triangle structure as an example, assuming that the thickness single-side allowance is set to 0.1mm, the first fixture is used on the first machine tool, and the two sides of the blank 3 are ground off by 0.1±0.01mm to ensure that the thickness is 4.76±0.02mm, the parallelism of the two end faces is ≤0.01, and the flatness error is 0.005.

[0066] like Fig.12As shown, a second fixture 4 is used on a second machine tool. The second machine tool takes a common forming grinder MM7132 as an example. A forming grinding wheel 41 is used to fine-grind the blank 3. One pass is sufficient, and the feed speed is 12m / min.

[0067] like Fig.13 As shown, a third fixture 5 is used on a third machine tool. The third machine tool takes a common forming grinder MM7120 as an example. A forming grinding wheel 51 is used to fine-grind the blank 3. One pass is sufficient, and the feed speed is 12m / min.

[0068] Since the three positioning edges (surfaces) of the triangle have already met the forming requirements when the blank is formed, the processing surface of micro-grinding is greatly reduced, thereby reducing the technical difficulty of micro-grinding in the application of equilateral triangle indexable micro-petroleum pipe thread tool processing. Micro-grinding can be directly achieved for the tooth shape, end face thickness and front cutting edge, and the tool accuracy under micro-grinding is ensured, so that micro-grinding can be efficiently applied in the processing of equilateral triangle indexable micro-petroleum pipe thread tool.

[0069] The equilateral triangle indexable micro-petroleum pipe thread tool and its processing method provided in this embodiment provide a new solution for improving the production efficiency and product quality of the equilateral triangle indexable micro-petroleum pipe thread tool by realizing the deep integration of tool design, mold technology, profiling technology and grinding technology. In the blank design stage, the key dimensions such as blank accuracy and allowance are accurately controlled to achieve the goal of high precision and low allowance. In particular, the design of the three positioning surfaces of the triangle directly meets the molding requirements, and the tooth shape and rake face design adopt a small allowance method. The blank meets the high precision requirements and ensures the stability and reliability in the subsequent processing process. It is particularly worth mentioning that, using the existing high-precision mold and pressing technology, the three positioning edges (surfaces) of the triangle can be directly formed during the blank forming process, and can be directly used as the positioning reference for subsequent processing and application. No additional grinding process is required, and the indexing accuracy is comparable to traditional grinding. After the blank is formed, only a small allowance fine grinding process is required for the tooth shape, rake face and thickness to complete the entire manufacturing process, which simplifies the production process, greatly improves production efficiency and reduces costs, and also ensures the high quality and consistency of the final product, and has no negative impact on the life of the finished product. In addition, this solution can cover both round thread and trapezoidal thread types to meet the needs of different application scenarios.

[0070] 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 are aware of 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 the 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 the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, 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, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. The processing method of the regular triangle indexable micro-petroleum pipe thread tool is characterized by: The method comprises: S100, blank design, including: S101, design of three locating surfaces of equilateral triangle, including the diameter accuracy of the inscribed circle is ±0.015~0.025mm, the concentricity deviation between the center of the inscribed circle and the center of the blank hole is ≤0.1mm, the absolute value of the difference between any two of the vertical distances from the center of the blank hole to the three locating surfaces is ≤0.1mm, and the angle tolerance between any two locating surfaces is ±7′; S102, thickness and rake face design, including thickness single side allowance and rake face allowance are 0.1~0.15mm; S103, tooth shape design, including the allowance in all directions of the tooth shape is 0.08~0.15mm; S200 uses high-precision molds to batch-press blanks. A single blank meets the blank design requirements of S100, and the three peripheral surfaces of the blank are directly used as three positioning surfaces without grinding; S300, according to the design of each allowance in S100, the blank is subjected to one tooth profile finishing and one rake face finishing to remove all allowances, thereby obtaining the equilateral triangle indexable micro oil pipe thread tool.

2. The method for machining a regular triangle indexable micro-petroleum pipe thread tool according to claim 1, characterized in that: In S200, the linear dimension accuracy of the mold is ±0.03mm, the angular accuracy is ±20′, and the linear accuracy of the tooth shape is ±0.03mm when adding complex tooth shapes.

3. The method for machining a regular triangle indexable micro-petroleum pipe thread tool according to claim 1, characterized in that: In S200, batch pressing and forming of blanks includes preparation of cemented carbide mixture, blank pressing and blank sintering. In the blank pressing process, an electric press is used with a pressure of 4 to 4.5 tons. When 10,000 pieces are used as a single furnace load, the pressing time is 70 to 100 hours.

4. The method for machining a regular triangle indexable micro-petroleum pipe thread tool according to claim 3 is characterized in that: In the process of preparing cemented carbide mixture, the preset cemented carbide is mixed and evenly stirred through ball milling process. The ball milling time is 70 to 100 hours. Spray granulation is carried out using a spray tower. The spraying time of 1 ton of material is 24 hours.

5. The method for machining a regular triangle indexable micro-petroleum pipe thread tool according to claim 3, characterized in that: During the sintering process of the blank, a low-pressure sintering furnace is used for sintering at a temperature of 1400-1500° and a sintering time of 20-50 hours.

6. The method for machining a regular triangle indexable micro-petroleum pipe thread tool according to claim 1, characterized in that: In S300, including removing the end face allowance, according to the single-side thickness allowance design, the first machine tool is used, the grinding allowance accuracy of the two end faces is ±0.01mm, the thickness accuracy is ±0.02mm, the parallelism of the two end faces is ≤0.01, and the flatness error is 0.

005.

7. The method for machining a regular triangle indexable micro-petroleum pipe thread tool according to claim 1, characterized in that: S300 includes removing the tooth profile allowance, using a second machine tool, using a profiled grinding wheel for fine grinding, presetting the feed speed, and removing it in one pass.

8. The method for machining a regular triangle indexable micro-petroleum pipe thread tool according to claim 1, characterized in that: In S300, the excess on the front cutting edge is removed by using a third machine tool, using a second forming grinding wheel for fine grinding, setting a feed speed, and removing it in one pass.

9. The regular triangle indexable micro oil pipe thread tool is characterized by: The tool is formed by using the regular triangle indexable micro-petroleum pipe thread tool processing method described in any one of claims 1-8.

10. The regular triangle indexable micro-petroleum pipe threading tool according to claim 9, characterized in that: The tool is an equilateral triangle indexable micro-petroleum pipe partial trapezoidal thread tool or an equilateral triangle indexable micro-petroleum pipe round thread tool.

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