CN111589890A - Pipe shrinking process for drill pipe connecting part - Google Patents
Pipe shrinking process for drill pipe connecting part Download PDFInfo
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- CN111589890A CN111589890A CN202010462213.1A CN202010462213A CN111589890A CN 111589890 A CN111589890 A CN 111589890A CN 202010462213 A CN202010462213 A CN 202010462213A CN 111589890 A CN111589890 A CN 111589890A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 55
- 239000010959 steel Substances 0.000 claims abstract description 55
- 238000000641 cold extrusion Methods 0.000 claims abstract description 45
- 239000000956 alloy Substances 0.000 claims description 63
- 229910045601 alloy Inorganic materials 0.000 claims description 63
- 239000000758 substrate Substances 0.000 claims description 22
- 238000001125 extrusion Methods 0.000 claims description 16
- 239000002994 raw material Substances 0.000 abstract description 18
- 238000012545 processing Methods 0.000 abstract description 12
- 238000013461 design Methods 0.000 abstract description 7
- 238000005553 drilling Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000007792 addition Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000002180 anti-stress Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention relates to a pipe reducing process for a drill pipe connecting part, which comprises the steps of assembling a steel pipe and an outer diameter forming die, and then carrying out cold extrusion to obtain a drill pipe; wherein the caliber shrinkage of the steel pipe in the cold extrusion is 0.8-1.2 mm. According to the invention, through the design of the die and the cold extrusion parameters in the pipe shrinking process, the problem of the wall thickness deviation of the male thread processing caused by the tolerance size of the raw material is solved, so that the drill rod thread with uniform wall thickness is processed in a limited wall thickness space, the strict control requirement on the tolerance size of the raw material is reduced, the raw material cost is reduced, and the yield of the finished product is ensured.
Description
Technical Field
The invention relates to the field of drill rods, in particular to a pipe shrinking process for a drill rod connecting part.
Background
At present, in vertical drilling of geological exploration or horizontal drilling of coal bed gas construction, a drill rod is taken as an important component of important torque transmission and drilling footage of construction, for example, CN204152450U discloses a full open type safety joint, which comprises a male joint and a female joint, wherein the male joint comprises a pipe body I and an external thread joint, and the external thread joint part is sequentially provided with a shoulder table surface I, a stress-resistant reduction groove I, a triangular thread I, an isosceles trapezoid thread I, an inclined trapezoid thread I and a proximity region I from inside to outside; female joint, including body II and interior screwed joint, interior screwed joint part is equipped with shoulder mesa II from inside to outside in proper order, and anti stress subducts groove II, triangle-shaped screw thread II, isosceles trapezoid screw thread II, triangle-shaped screw thread III and approach zone II. The utility model discloses fully consider the factor of metal deflection, use safe and reliable, installation and dismouting are rapid, and the cooperation makes the limit torque resistance of screw thread the highest can reach 55000N m. CN203476222U discloses a drill rod and a drilling system. The drill rod is of a seamless tubular structure; the pipe wall thickness of the two ends of the tubular structure is larger than that of the middle part; one end of the drill rod is provided with an external-buckling trapezoidal thread, and the other end of the drill rod is provided with an internal-buckling trapezoidal thread. A drilling system comprising a drill, a drill rod assembly and a drill bit; the drill rod components are connected in series by a plurality of drill rods, and the connection mode of two adjacent drill rods is that an external-buckling trapezoidal thread is connected with an internal-buckling trapezoidal thread; the shaft of the drill is connected with the inner-buckled trapezoidal thread end of the drill rod component, and the outer-buckled trapezoidal thread end of the drill rod component is connected with the drill bit. This drilling rod adopts seamless tubular structure, avoids causing the damage at the seam crossing in the in-process of processing, and trapezoidal thread can increase the wall thickness at drilling rod both ends to add intensity, prevent to cause the damage at the in-process to drilling rod processing, and prevented drilling rod distortion, deformation under the drilling rod pressurized and ambient pressure's the condition. The thread form is narrow and shallow, the top surfaces of the male and female thread teeth are in interference fit, the tooth surfaces are tightly occluded, the thread gluing phenomenon is easily caused in the screwing and unscrewing process, and the thread surface is easily scratched or cannot be unscrewed after being unscrewed.
The thread structure form at both ends of the drill rod is directly related to the connection strength and the service life of the drill rod. According to the characteristics of construction drilling, the drill rod is a special trapezoidal thread with the depth of about 1mm directly machined at two ends of a thin-wall seamless steel pipe with the wall thickness of 5-6 mm. Due to different rolling processes of the seamless steel tube, the wall thickness and the inner and outer apertures of the raw material of the drill rod have different dimensional differences and eccentricities, so that the effective wall thickness reduction during the male thread processing is obvious, the thread strength is weakened, and finally the fracture accident at the thread part of the drill rod is easy to happen. Meanwhile, in the traditional thin-wall drill rod processing, the dimensional tolerance of a steel pipe raw material supplier is restricted mainly through high-cost material investment, the wall thickness tolerance of the steel pipe raw material supplier is controlled within +/-8%, and then qualified finished products can be selected through strict screening in the later-stage processing.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a pipe reducing process for a drill rod connecting part, which aims to solve the problem of wall thickness deviation of male thread machining caused by the tolerance size of raw materials, so that drill rod threads with uniform wall thickness are machined in a limited wall thickness space, the strict control requirement on the tolerance size of the raw materials is reduced, the raw material cost is reduced, and the yield of finished products is ensured.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a pipe reducing process for a drill pipe connecting part, which comprises the steps of assembling a steel pipe and an outer diameter forming die, and then carrying out cold extrusion to obtain a drill pipe; wherein the caliber shrinkage of the steel pipe in the cold extrusion is 0.8-1.2 mm.
According to the invention, through the design of the die and the cold extrusion parameters in the pipe shrinking process, the problem of the wall thickness deviation of the male thread processing caused by the tolerance size of the raw material is solved, so that the drill rod thread with uniform wall thickness is processed in a limited wall thickness space, the strict control requirement on the tolerance size of the raw material is reduced, the raw material cost is reduced, and the yield of the finished product is ensured. Further, the too large or too small caliber shrinkage of the steel pipe in cold extrusion can cause the metallographic structure of the internal structure of the pipe to deform, the design size requirement cannot be met consistently, and the thread strength can be weakened.
In the present invention, the amount of reduction in the diameter of the steel pipe in the cold extrusion is 0.8 to 1.2mm, and may be, for example, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm or 1.2mm, but is not limited to the values mentioned above, and other values not mentioned above within the range are also applicable.
In a preferred embodiment of the present invention, the steel pipe is a seamless steel pipe.
As a preferable technical scheme of the invention, the outer diameter forming die comprises a base body and a hard alloy sleeve.
Preferably, the cemented carbide sleeve and the base body are fitted.
As a preferable technical scheme of the invention, the substrate is of an annular step structure.
Preferably, the base body is provided with a first annular concave step and a second annular concave step in this order.
Preferably, the inner diameter of the second annular concave step is the same as the outer diameter of the steel pipe.
Preferably, the hard alloy sleeve is arranged on the step surface of the second annular concave step.
As a preferable aspect of the present invention, an inner diameter of the first annular recessed step is the same as an outer diameter of the cemented carbide sleeve.
Preferably, the difference between the inner diameter of the base body and the inner diameter of the cemented carbide sleeve is 0.8-1.2mm, for example, 0.8mm, 0.82mm, 0.84mm, 0.86mm, 0.88mm, 0.9mm, 0.92mm, 0.94mm, 0.96mm, 0.98mm, 1mm, 1.05mm, 1.1mm, 1.15mm or 1.2mm, but not limited to the values listed, and other values not listed in this range are equally applicable. For example, if the difference between the inner diameter of the base and the inner diameter of the cemented carbide sleeve is 1mm, the difference is 1mm, which is the value obtained by subtracting the inner diameter of the cemented carbide sleeve from the inner diameter of the base.
In the invention, the shrinkage control in the cold extrusion process is realized through the design of the die (the difference between the inner diameter of the matrix and the inner diameter of the hard alloy sleeve).
In a preferred embodiment of the present invention, the cemented carbide sleeve has a thickness of 20 to 25mm in the direction of the center line, and may be, for example, 20mm, 21mm, 22mm, 23mm, 24mm, or 25mm, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
As a preferable technical scheme of the invention, one end of the inner wall of the hard alloy sleeve is provided with an inclined surface.
Preferably, the angle between the bevel and the centerline of the cemented carbide sleeve is 25-30 °, such as 25 °, 26 °, 27 °, 28 °, 29 °, or 30 °, but not limited to the values listed, and other values not listed in this range are equally applicable.
Preferably, the thickness of the inclined surface along the centerline of the cemented carbide sleeve is 3 to 5mm, for example, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm, but is not limited to the values listed, and other values not listed in this range are also applicable.
In a preferred embodiment of the present invention, the extrusion pressure in the cold extrusion is 500-800kN, such as 500kN, 550kN, 600kN, 650kN, 700kN, 750kN or 800kN, but is not limited to the values listed, and other values not listed in the range are also applicable.
In a preferred embodiment of the present invention, the extrusion stroke in the cold extrusion is 40 to 45mm, for example, 40mm, 41mm, 42mm, 43mm, 44mm or 45mm, but is not limited to the above-mentioned values, and other values not shown in the above range are also applicable.
As the preferable technical scheme of the invention, the process comprises the steps of assembling a steel pipe and an outer diameter forming die, and then carrying out cold extrusion to obtain the drill rod; wherein the caliber shrinkage of the steel pipe in the cold extrusion is 0.8-1.2 mm;
wherein the steel pipe is a seamless steel pipe; the outer diameter forming die comprises a base body and a hard alloy sleeve; the hard alloy sleeve and the substrate are installed in a matched mode; the substrate is of an annular step structure; the substrate is sequentially provided with a first annular concave step and a second annular concave step; the inner diameter of the second annular concave step is the same as the outer diameter of the steel pipe; the hard alloy is sleeved on the step surface of the second annular concave step; the inner diameter of the first annular concave step is the same as the outer diameter of the hard alloy sleeve; the difference value between the inner diameter of the substrate and the inner diameter of the hard alloy sleeve is 0.8-1.2 mm; the thickness of the hard alloy sleeve along the direction of the central line is 20-25 mm; one end of the inner wall of the hard alloy sleeve is provided with an inclined plane; the included angle between the inclined plane and the central line of the hard alloy sleeve is 25-30 degrees; the thickness of the inclined plane along the central line direction of the hard alloy sleeve is 3-5 mm; the extrusion force in the cold extrusion is 500-800 kN; the extrusion stroke in the cold extrusion is 40-45 mm.
In the invention, the surface of the outer diameter forming die is also provided with a groove, and the groove is used for fixing the outer diameter forming die in cold extrusion equipment.
Compared with the prior art, the invention at least has the following beneficial effects:
according to the invention, through the design of the die and the cold extrusion parameters in the pipe shrinking process, the problem of the wall thickness deviation of the male thread processing caused by the tolerance size of the raw material is solved, so that the drill rod thread with uniform wall thickness is processed in a limited wall thickness space, the strict control requirement on the tolerance size of the raw material is reduced, the raw material cost is reduced, the yield of the finished product is ensured, and the yield is up to more than 97%.
Drawings
FIG. 1 is a schematic view of a base in an outer diameter forming die in example 1 of the present invention;
FIG. 2 is a schematic view of a cemented carbide sleeve in an outside diameter forming mold in example 1 of the present invention;
fig. 3 is an assembly view of the outer diameter forming mold in embodiment 1 of the present invention.
In the figure: 1-a first annular concave step, 1.1-a step surface of the first annular concave step, 1.2-a side surface of the first annular concave step, 2-a second annular concave step, 2.1 a step surface of the second annular concave step, 2.2-a side surface of the second annular concave step, 3-a base body, 4-a cemented carbide sleeve.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a pipe reducing process for a drill pipe connecting part, which comprises the steps of assembling a steel pipe and an outer diameter forming die, and then carrying out cold extrusion to obtain a drill pipe; wherein the caliber shrinkage of the steel pipe in the cold extrusion is 1 mm; the outer diameter forming die is shown in figures 1, 2 and 3;
wherein the steel pipe is a seamless steel pipe (ZT 640); the outer diameter forming die comprises a base body (45 steel) and a hard alloy sleeve (YG 8); the hard alloy sleeve and the substrate are installed in a matched mode; the substrate is of an annular step structure; the substrate is sequentially provided with a first annular concave step and a second annular concave step; the inner diameter of the second annular concave step is the same as the outer diameter of the steel pipe; the hard alloy is sleeved on the step surface of the second annular concave step; the inner diameter of the first annular concave step is the same as the outer diameter of the hard alloy sleeve; the difference value between the inner diameter of the base body and the inner diameter of the hard alloy sleeve is 1 mm; the thickness of the hard alloy sleeve along the direction of the central line is 20 mm; one end of the inner wall of the hard alloy sleeve is provided with an inclined plane; the included angle between the inclined plane and the central line of the hard alloy sleeve is 27 degrees; the thickness of the inclined plane along the central line direction of the hard alloy sleeve is 3 mm; the extrusion force in the cold extrusion is 500 kN; the extrusion stroke in the cold extrusion is 40 mm.
The obtained drill rod can be used for processing threads with uniform wall thickness, the minimum wall thickness of the root of each thread can be ensured, and the wall thickness deviation can be controlled within 0.3 mm.
Example 2
The embodiment provides a pipe reducing process for a drill pipe connecting part, which comprises the steps of assembling a steel pipe and an outer diameter forming die, and then carrying out cold extrusion to obtain a drill pipe; wherein the caliber shrinkage of the steel pipe in the cold extrusion is 0.8 mm.
Wherein the steel pipe is a seamless steel pipe (ZT 750); the outer diameter forming die comprises a base body (45 steel) and a hard alloy sleeve (YG 8); the hard alloy sleeve and the substrate are installed in a matched mode; the substrate is of an annular step structure; the substrate is sequentially provided with a first annular concave step and a second annular concave step; the inner diameter of the second annular concave step is the same as the outer diameter of the steel pipe; the hard alloy is sleeved on the step surface of the second annular concave step; the inner diameter of the first annular concave step is the same as the outer diameter of the hard alloy sleeve; the difference value between the inner diameter of the base body and the inner diameter of the hard alloy sleeve is 0.8 mm; the thickness of the hard alloy sleeve along the direction of the central line is 22 mm; one end of the inner wall of the hard alloy sleeve is provided with an inclined plane; the included angle between the inclined plane and the central line of the hard alloy sleeve is 25 degrees; the thickness of the inclined plane along the central line direction of the hard alloy sleeve is 5 mm; the extrusion force in the cold extrusion is 700 kN; the extrusion stroke in the cold extrusion was 45 mm.
The obtained drill rod can be used for processing threads with uniform wall thickness, the minimum wall thickness of the root part of the threads can be ensured, and the wall thickness deviation can be controlled within 0.35 mm.
Example 3
The embodiment provides a pipe reducing process for a drill pipe connecting part, which comprises the steps of assembling a steel pipe and an outer diameter forming die, and then carrying out cold extrusion to obtain a drill pipe; wherein the caliber shrinkage of the steel pipe in the cold extrusion is 1.2 mm.
Wherein the steel pipe is a seamless steel pipe (ZT 850); the outer diameter forming die comprises a base body (45 steel) and a hard alloy sleeve (YG 8); the hard alloy sleeve and the substrate are installed in a matched mode; the substrate is of an annular step structure; the substrate is sequentially provided with a first annular concave step and a second annular concave step; the inner diameter of the second annular concave step is the same as the outer diameter of the steel pipe; the hard alloy is sleeved on the step surface of the second annular concave step; the inner diameter of the first annular concave step is the same as the outer diameter of the hard alloy sleeve; the difference value between the inner diameter of the base body and the inner diameter of the hard alloy sleeve is 1.2 mm; the thickness of the hard alloy sleeve along the direction of the central line is 25 mm; one end of the inner wall of the hard alloy sleeve is provided with an inclined plane; the included angle between the inclined plane and the central line of the hard alloy sleeve is 30 degrees; the thickness of the inclined plane along the central line direction of the hard alloy sleeve is 4 mm; the extrusion force in the cold extrusion is 800 kN; the extrusion stroke in the cold extrusion was 43 mm.
The obtained drill rod can be used for processing threads with uniform wall thickness, the minimum wall thickness of the root part of the threads can be ensured, and the wall thickness deviation can be controlled within 0.25 mm.
Example 4
The embodiment provides a pipe reducing process for a drill pipe connecting part, which comprises the steps of assembling a steel pipe and an outer diameter forming die, and then carrying out cold extrusion to obtain a drill pipe; wherein the caliber shrinkage of the steel pipe in the cold extrusion is 0.87 mm.
Wherein the steel pipe is a seamless steel pipe (ZT 950); the outer diameter forming die comprises a base body (45 steel) and a hard alloy sleeve (YG 8); the hard alloy sleeve and the substrate are installed in a matched mode; the substrate is of an annular step structure; the substrate is sequentially provided with a first annular concave step and a second annular concave step; the inner diameter of the second annular concave step is the same as the outer diameter of the steel pipe; the hard alloy is sleeved on the step surface of the second annular concave step; the inner diameter of the first annular concave step is the same as the outer diameter of the hard alloy sleeve; the difference between the inner diameter of the base body and the inner diameter of the hard alloy sleeve is 0.87 mm; the thickness of the hard alloy sleeve along the direction of the central line is 23 mm; one end of the inner wall of the hard alloy sleeve is provided with an inclined plane; the included angle between the inclined plane and the central line of the hard alloy sleeve is 28 degrees; the thickness of the inclined plane along the central line direction of the hard alloy sleeve is 4.4 mm; the extrusion force in the cold extrusion is 750 kN; the extrusion stroke in the cold extrusion was 41 mm.
The obtained drill rod can be used for processing threads with uniform wall thickness, the minimum wall thickness of the root of each thread can be ensured, and the wall thickness deviation can be controlled within 0.3 mm.
Comparative example 1
Only the difference from the embodiment 1 is that the caliber shrinkage of the steel pipe in the cold extrusion is 0.5mm, namely the difference between the inner diameter of the matrix and the inner diameter of the hard alloy sleeve is 0.5 mm; the tolerance of the wall thickness of the obtained drill rod is large, the design size requirement cannot be met, and the thread strength is weakened.
Comparative example 2
The difference from the example 1 is only that the bore shrinkage of the steel pipe in the cold extrusion is 2mm, namely, the difference between the inner diameter of the matrix and the inner diameter of the hard alloy sleeve is 2 mm. Due to cold extrusion deformation and overlarge caliber shrinkage, a metallographic structure in the material is deformed, the strength of a material matrix is influenced, and the strength of threads is weakened.
In the invention, the seamless steel pipes in the embodiment and the comparative example are selected according to (GB/T16950-.
According to the embodiment and the comparative example, the design of the die and the cold extrusion parameters in the pipe shrinking process solves the problem of the wall thickness deviation of the male thread due to the tolerance size of the raw material, so that the drill rod thread with uniform wall thickness is machined in a limited wall thickness space, the strict control requirement on the tolerance size of the raw material is reduced, the cost of the raw material is reduced, the yield of the finished product is ensured, and the yield is up to more than 97%.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A pipe reducing process for a drill pipe connecting part is characterized by comprising the steps of assembling a steel pipe and an outer diameter forming die, and then carrying out cold extrusion to obtain a drill pipe; wherein the caliber shrinkage of the steel pipe in the cold extrusion is 0.8-1.2 mm.
2. The process of claim 1, wherein the steel pipe is a seamless steel pipe.
3. The process of claim 1 or 2, wherein the outer diameter forming die comprises a base body and a cemented carbide sleeve;
preferably, the cemented carbide sleeve and the base body are fitted.
4. The process of claim 3, wherein the substrate is an annular step structure;
preferably, the base body is provided with a first annular concave step and a second annular concave step in sequence;
preferably, the inner diameter of the second annular concave step is the same as the outer diameter of the steel pipe;
preferably, the hard alloy sleeve is arranged on the step surface of the second annular concave step.
5. The process of claim 3 or 4, wherein the inner diameter of the first annular concave step and the outer diameter of the cemented carbide sleeve are the same;
preferably, the difference between the inner diameter of the base body and the inner diameter of the cemented carbide sleeve is 0.8-1.2 mm.
6. The process according to any one of claims 3 to 5, wherein the cemented carbide sleeve has a thickness in the direction of the centre line of from 20 to 25 mm.
7. The process according to any one of claims 3 to 6, wherein one end of the inner wall of the cemented carbide sleeve is provided with a bevel;
preferably, the included angle between the inclined plane and the central line of the hard alloy sleeve is 25-30 degrees;
preferably, the thickness of the inclined surface along the central line direction of the hard alloy sleeve is 3-5 mm.
8. The process according to any one of claims 1 to 7, wherein the extrusion force in the cold extrusion is 500kN and 800 kN.
9. The process according to any one of claims 1 to 8, wherein the extrusion stroke in the cold extrusion is 40 to 45 mm.
10. The process according to any one of claims 1 to 9, wherein the process comprises assembling a steel pipe with an outer diameter forming die, followed by cold extrusion to obtain the drill rod; wherein the caliber shrinkage of the steel pipe in the cold extrusion is 0.8-1.2 mm;
wherein the steel pipe is a seamless steel pipe; the outer diameter forming die comprises a base body and a hard alloy sleeve; the hard alloy sleeve and the substrate are installed in a matched mode; the substrate is of an annular step structure; the substrate is sequentially provided with a first annular concave step and a second annular concave step; the inner diameter of the second annular concave step is the same as the outer diameter of the steel pipe; the hard alloy is sleeved on the step surface of the second annular concave step; the inner diameter of the first annular concave step is the same as the outer diameter of the hard alloy sleeve; the difference value between the inner diameter of the substrate and the inner diameter of the hard alloy sleeve is 0.8-1.2 mm; the thickness of the hard alloy sleeve along the direction of the central line is 20-25 mm; one end of the inner wall of the hard alloy sleeve is provided with an inclined plane; the included angle between the inclined plane and the central line of the hard alloy sleeve is 25-30 degrees; the thickness of the inclined plane along the central line direction of the hard alloy sleeve is 3-5 mm; the extrusion force in the cold extrusion is 500-800 kN; the extrusion stroke in the cold extrusion is 40-45 mm.
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| CN202010462213.1A CN111589890A (en) | 2020-05-27 | 2020-05-27 | Pipe shrinking process for drill pipe connecting part |
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| CN202010462213.1A CN111589890A (en) | 2020-05-27 | 2020-05-27 | Pipe shrinking process for drill pipe connecting part |
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| CN207431095U (en) * | 2017-11-29 | 2018-06-01 | 天津市联众钢管有限公司 | It is a kind of can automatic centering steel tube end part necking down device |
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| CN207431095U (en) * | 2017-11-29 | 2018-06-01 | 天津市联众钢管有限公司 | It is a kind of can automatic centering steel tube end part necking down device |
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Application publication date: 20200828 |