CN115890170A - Eccentric conical tube machining method - Google Patents
Eccentric conical tube machining method Download PDFInfo
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- CN115890170A CN115890170A CN202310213833.5A CN202310213833A CN115890170A CN 115890170 A CN115890170 A CN 115890170A CN 202310213833 A CN202310213833 A CN 202310213833A CN 115890170 A CN115890170 A CN 115890170A
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Abstract
The invention relates to the technical field of metal forging, in particular to a method for machining an eccentric conical pipe. The method comprises the following steps: s11, obtaining an containing body of the target eccentric cone pipe based on the appearance size of the target eccentric cone pipe; s12, obtaining the size of an external expansion ring blank and/or the size of an internal contraction ring blank based on a plurality of parameter combinations in the appearance size of the containing body, the wall thickness delta of the target eccentric cone pipe and the weight of the target eccentric cone pipe; step S13, forging and allowance processing removal are carried out on the external expansion ring blank or the internal contraction ring blank to obtain a positive cone pipe; and S14, cutting and rounding two end parts of the positive cone pipe to obtain the target eccentric cone pipe. Therefore, the problems of axial welding seams and low bearing capacity of the eccentric cone pipe are solved.
Description
Technical Field
The invention relates to the technical field of metal forging, in particular to a method for machining an eccentric conical tube.
Background
Large pressure vessels for testing or production are constructed that need to be connected by piping. In some severe working environments, the pipeline needs to be able to withstand high temperature (400-1200 ℃) and high pressure environment for safe operation. In order to adapt to the use environment, the pipeline needs to have higher strength and durability, and needs to adopt a high-temperature-resistant alloy material, so that the axial weld joints of the pipeline are reduced as much as possible, and the integral strength of the pipe fitting is ensured.
Due to the variation of the diameter of the pipeline, the pipeline needs to be connected by using a pipe fitting (namely, an eccentric cone pipe) with circular openings at two ends and different opening diameters. Aiming at the problem that the eccentric cone pipe is usually manufactured in a plate rolling mode, a pre-calculated plate is rolled, shaped and then welded and fixed, the method has the defect that a full-length axial welding line exists, and the pressure bearing capacity of the pipe fitting is greatly reduced.
Disclosure of Invention
In order to solve the problems of axial weld seam and low bearing capacity of the eccentric cone pipe, the invention provides a method for processing the eccentric cone pipe, which comprises the following steps:
s11, obtaining an containing body of the target eccentric cone pipe based on the appearance size of the target eccentric cone pipe;
s12, obtaining the outer diameter, the length and the wall thickness of an external expanding ring blank based on the maximum length of the small end face of the containing body, the height of the containing body and the weight of the target eccentric cone pipe; and/or obtaining the outer diameter, the length and the wall thickness of the inner shrink ring blank based on the maximum length of the large end face of the containing body, the length of a bus of the containing body and the wall thickness delta of the target eccentric cone pipe;
step S13, forging and allowance processing removal are carried out on the external expansion ring blank or the internal contraction ring blank to obtain a positive cone pipe;
and S14, cutting and rounding two end parts of the positive cone pipe to obtain the target eccentric cone pipe.
In some embodiments, the containing body is configured as a minimum volume containing cone tube containing the target eccentric cone tube; the peripheral body of the target eccentric cone pipe is a part of the peripheral body containing the cone pipe; the end face of the containing cone pipe is perpendicular to an angular bisector of an included angle between body side lines at two sides of the target eccentric cone pipe on the symmetrical plane of the target eccentric cone pipe; the two end faces of the containing cone pipe are parallel.
In some embodiments, WD is less than or equal to Md1, wherein WD is the outer diameter of the external expanding ring blank, and Md1 is the maximum length of the small end face of the containing cone pipe.
In some embodiments of the present invention, the,
the WH is the length of the outer expanding ring blank, the MH is the height of the containing cone pipe, and the MD1 is the maximum length of the large end face of the containing cone pipe.
In some embodiments, the wall thickness of one end of the outer expanding ring blank is greater than or equal to the wall thickness of the other end; the inner wall of the external expanding ring blank smoothly extends from one end to the other end.
In some embodiments, ND is less than or equal to MD1, wherein ND is the outer diameter of the inner shrink ring blank, and MD1 is the maximum length of the large end face of the containing cone pipe.
In some embodiments, NH = (0.9 to 1) × L, where NH is a length of the inner shrink ring blank, and L is a length of a bus of the containing cone tube on a symmetry plane of the target eccentric cone tube.
In some embodiments, the wall thickness of one end of the inner shrink ring blank is greater than or equal to the wall thickness of the other end; the inner wall of the inner shrink ring blank smoothly extends from one end to the other end.
In some embodiments, N δ 1= (0.9 to 0.95) × δ, wherein N δ 1 is a wall thickness of one end of the inner shrink ring blank; and N delta 2= (0.85 to 0.9) ×, wherein the N delta 2 is the wall thickness of the other end of the inner shrink ring blank.
In some embodiments, the step S14 includes:
step S141, cutting the small end face of the positive cone pipe to obtain a processed small end face; on a symmetrical plane after the small end face of the forward cone tube is cut, the size of an included angle between a projection line of the machined small end face and a side line of the side body of the forward cone tube is a value of an angle beta; beta is an included angle between a small end face projection line of the target eccentric cone pipe and a side line of the side body of the forward cone pipe on a symmetrical plane of the target eccentric cone pipe;
step S142, cutting the large end face of the positive cone pipe to obtain a processed large end face; the processed big end surface is parallel to the processed small end surface; the distance between the machined large end face and the machined small end face is the height of the target eccentric cone pipe;
and S143, shaping the machined small end face hole and the machined large end face hole into circles to obtain the target eccentric cone pipe.
In order to solve the problems of axial weld seam and low bearing capacity of the eccentric cone pipe, the invention has the following advantages:
1 the size of the ring blank is determined based on the containing body of the target eccentric cone pipe, so that the utilization rate of the blank can be improved, the amount of tailings is reduced, and the manufacturing cost is reduced.
2. And (3) obtaining the right cone pipe by integrally forging the ring blank, and processing two end parts of the right cone pipe to obtain the eccentric cone pipe of the target eccentric cone pipe. Therefore, the axial weld seam of the eccentric cone pipe after machining can be avoided, and the bearing capacity is improved.
Drawings
FIG. 1 illustrates a schematic view of an embodiment eccentric cone machining method;
FIG. 2 shows a schematic view of an eccentric cone machining method of another embodiment;
FIG. 3 illustrates an eccentric cone tube perspective view of an embodiment;
FIG. 4 illustrates a top view of an embodiment of an eccentric cone;
FIG. 5 shows a schematic cross-sectional view of an eccentric cone tube and containment body of an embodiment;
FIG. 6 is a schematic sectional view of the containing body of the eccentric cone tube according to an embodiment;
FIG. 7 illustrates a top view of the containment body of the eccentric cone tube of an embodiment;
FIG. 8 shows a schematic cross-sectional view of an embodiment of an externally flared ring blank;
fig. 9 shows a schematic cross-sectional view of an embodiment of the inner shrink ring blank.
The figures are numbered:
10 target eccentric cone tube;
11, small end face of the inclined conical pipe;
12 large end surface of the inclined conical pipe;
13, deviating the side wall body of the conical pipe;
20 comprises a cone pipe;
21 containing the small end surface of the taper pipe;
22 containing the large end surface of the taper pipe;
30, externally expanding a ring blank;
and (40) shrinking the ring blank.
Detailed Description
The disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable one of ordinary skill in the art to better understand and thus implement the present disclosure, and do not imply any limitation on the scope of the present disclosure.
As used herein, the term "include" and its variants are to be read as open-ended terms meaning "including, but not limited to. The term "based on" is to be read as "based, at least in part, on". The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment". The term "another embodiment" is to be read as "at least one other embodiment".
The embodiment discloses a method for processing an eccentric cone pipe, which comprises the following steps as shown in fig. 1:
step S11, obtaining an containing body of the target eccentric cone pipe 10 based on the appearance size of the target eccentric cone pipe 10;
s12, obtaining the outer diameter, the length and the wall thickness of an external expanding ring blank based on the maximum length of the small end face of the containing body, the height of the containing body and the weight of the target eccentric cone pipe; and/or obtaining the outer diameter, the length and the wall thickness of the inner shrink ring blank based on the maximum length of the large end face of the containing body, the length of the bus of the containing body and the wall thickness delta of the target eccentric cone tube;
step S13, forging and allowance processing removal are carried out on the externally expanded ring blank 30 or the internally contracted ring blank 40, and a positive cone pipe is obtained;
and S14, cutting and rounding the two end parts of the right cone pipe to obtain the target eccentric cone pipe 10.
In the present embodiment, as shown in fig. 3, 4 and 5, the target eccentric cone pipe 10 may be a hollow tubular structure, and includes a small end surface 11, a large end surface 12 and a side wall body 13. The small end surface 11 of the partial cone pipe and the large end surface 12 of the partial cone pipe are parallel to each other. The small end surface 11 of the partial cone pipe is annular, the outer diameter of the partial cone pipe is Yd1, and the inner diameter of the partial cone pipe is Yd2. The large end surface 12 of the partial cone pipe is annular, the outer diameter of the partial cone pipe is YD1, the inner diameter of the partial cone pipe is YD2, and Yd1 is smaller than YD1. The height of the target eccentric cone tube 10 is YH. The side wall body 13 of the cone deflection pipe smoothly extends from the small end surface 11 of the cone deflection pipe to the large end surface 12 of the cone deflection pipe. The small end surface 11 of the inclined conical pipe and the large end surface 12 of the inclined conical pipe are connected with pipelines with different pipe diameters, so that the reducing transmission fluid medium of the pipeline system is realized. The machining method of the eccentric cone pipe may include steps S11 to S14, and each step is described in detail below.
In step S11, the overall pipe system is designed to obtain the external dimensions of the target eccentric cone pipe 10. As shown in fig. 3 and 4, the external dimensions of the target eccentric cone tube 10 may include an outer diameter Yd1 of the small end surface 11 of the eccentric cone tube, an inner diameter Yd2 of the small end surface 11 of the eccentric cone tube, an outer diameter Yd1 of the large end surface 12 of the eccentric cone tube, an inner diameter Yd2 of the large end surface 12 of the eccentric cone tube, a thickness δ of the side wall body 13 of the eccentric cone tube, and a height YH of the eccentric cone tube. The envelope of the target eccentric cone tube 10 can be obtained by the external dimensions of the target eccentric cone tube 10. Therefore, the blank for machining the eccentric cone tube can be obtained through the containing body, and the tailing in the blank manufacturing process is reduced, so that the manufacturing cost is reduced. In other embodiments, a cross-sectional view of the subject eccentric cone tube 10 in its plane of symmetry is shown in fig. 5 and 6. The target eccentric cone pipe 10 comprises a left side wall and a right side wall of the target eccentric cone pipe 10 in a symmetrical plane as shown in fig. 5, projection lines of the outer walls of the two side walls are extended to meet at a point and form an included angle, and the size of the included angle is 2 alpha (half of the included angle is alpha). The containment body may be a containment cone tube 20 that contains the smallest volume of the target eccentric cone tube 10. The peripheral side body (hatched portion in fig. 5) of the target eccentric cone tube 10 may be a partial peripheral side body (hatched portion in fig. 6) that houses the cone tube 20. The end face of the containing cone pipe 20 can be perpendicular to an angular bisector of an included angle of side lines of two sides of the target eccentric cone pipe 10 on a symmetrical plane of the target eccentric cone pipe 10; the two end faces of the containing cone tube 20 can be parallel. In this way, the minimum volume of the containing cone tube 20 can be obtained, thereby further reducing the tailing in the blank manufacturing process and reducing the manufacturing cost.
Step S12, when the ring blank is formed by a forging process, two production processes may be selected, one is to form a final product by expanding the ring blank, and the other is to form a final product by compressing the ring blank. Of course, the two methods are often combined during forging. The size of the flared ring blank 30 can be obtained by the end face size of the containing body, the height of the containing body and the weight of the target eccentric cone tube 10. Therefore, the outer expanding ring blank 30 can be conveniently processed by an outer expanding forging mode, so that the eccentric cone tube of the target eccentric cone tube 10 without the axial weld joint can be obtained, and the strength of the eccentric cone tube is further improved. The size of the inner shrink ring blank 40 can also be obtained through the size of the end face of the containing body, the height of the containing body and the thickness delta of the side wall of the target eccentric cone tube 10. Therefore, the inner-shrinkage ring blank 40 can be conveniently machined in an inner-shrinkage forging mode, so that the eccentric cone tube of the target eccentric cone tube 10 without the axial weld joint is obtained, and the strength of the eccentric cone tube is further improved. In order to ensure that the final size of a machined product meets the design requirement, a certain allowance is left after forging and forming, and allowance removal machining is needed to be carried out on a forged ring blank, so that the forward cone tube is obtained. In other embodiments, the containing body may be the containing cone tube 20 containing the minimum volume of the target eccentric cone tube 10. As shown in fig. 6 and 7, the female cone pipe 20 includes a female cone pipe small end face 21, a female cone pipe large end face 22, and a side wall body thereof. As shown in fig. 7, the small end surface 21 of the accommodating conical tube may be an elliptical ring, the maximum length (i.e., the major diameter) of the small end surface of the accommodating conical tube 20 may be Md1, and the minimum length (i.e., the minor diameter) of the small end surface of the accommodating conical tube 20 may be Md2. The large end surface 22 of the accommodating cone tube may also be an elliptical ring, the maximum length (i.e., the long diameter) of the large end surface of the accommodating cone tube 20 may be MD1, and the minimum length (i.e., the short diameter) of the large end surface of the accommodating cone tube 20 may be MD2. The annular dimension accommodating the small end face 21 of the cone and the annular dimension accommodating the large end face 22 of the cone may be different. As shown in fig. 5, the height MH of the receiving cone 20 can consist of three sections, namely MH = MH1+ MH2+ MH3. In fig. 5, the included angle between the small end face 21 of the containing cone of the target eccentric cone tube 10 and the left side wall thereof may be set to 90 ° (of course, other angles are also possible, and 90 ° is taken for convenience of calculation), so that MH1, MH2, and MH3 may be calculated through the height YH of the target eccentric cone tube 10, the outer diameter Yd1 of the small end face 11 of the eccentric cone tube, the outer diameter Yd1 of the large end face 12 of the eccentric cone tube, the side wall thickness δ of the target eccentric cone tube 10, and the geometric relationship thereof, thereby finally obtaining the value of MH. The length L of the generatrix containing the cone tube 20 can also be calculated from MH and the angle α. The maximum length (i.e., the major diameter) Md1 of the small end face of the containing cone tube 20 can be taken as the outer diameter WD of the outer expanding ring blank 30, the height MH of the containing cone tube 20 can be taken as the length WH of the outer expanding ring blank 30, and finally the wall thickness of the outer expanding ring blank 30 can be calculated by taking the weight of the target eccentric cone tube 10 as the weight of the outer expanding ring blank 30. Therefore, the appearance size of the external expansion ring blank 30 can be accurately obtained, and the generation of tailings in the machining process is reduced. The maximum length (i.e., the major diameter) MD1 of the large end face of the containing cone tube 20 can be taken as the outer diameter ND of the inner shrink ring blank 40, the bus length L of the containing cone tube 20 can be taken as the length NH of the inner shrink ring blank 40, and the side wall thickness of the inner shrink ring blank 40 is (0.85 to 0.95) times of the side wall thickness δ of the target eccentric cone tube 10. Therefore, the appearance size of the inner shrink ring blank 40 can be accurately obtained, and the generation of tailings is reduced.
In step S13, the outer expanded ring blank 30 may be manufactured according to the size of the outer expanded ring blank 30. Then the outward-expanding ring blank 30 is subjected to outward-expanding forging to obtain the forward cone pipe. The inner shrink ring blank 40 may also be manufactured according to the size of the inner shrink ring blank 40. The inner shrink ring blank 40 is then subjected to inner shrink forging to obtain a forward taper tube. The positive cone pipe can comprise two end faces which are parallel to each other and are both circular rings, and the height of the positive cone pipe can be more than or equal to the height MH of the containing cone pipe 20. By adopting the annular blank for forging processing, the axial weld seam of the eccentric cone pipe can be avoided, and the strength of the eccentric cone pipe is improved.
Step S14, the two end parts of the forged positive cone pipe can be cut and processed in a full circle to obtain the eccentric cone pipe of the target eccentric cone pipe 10, so that the eccentric cone pipe can be obtained in a ring-shaped forging processing mode, the axial welding seam of the eccentric cone pipe can be avoided, and the strength of the eccentric cone pipe can be improved. In other embodiments, as shown in fig. 2, step S14 may include steps S141 to S143, and each step is described in detail below. In step S141, the small end face of the positive cone pipe may be cut to obtain a machined small end face. And cutting from the outer edge of the small end surface of the positive cone tube serving as a starting point to the inner side of the positive cone tube in an inclined way, wherein the projection of the cut tailing on the symmetrical surface is triangular. As shown in fig. 5, on the symmetry plane of the eccentric cone tube, the included angle between the small end surface projection line of the target eccentric cone tube and the right side body edge line of the right cone tube can be set as β. The size of the included angle between the projection line of the small end face and the side line of the side body of the forward cone tube after machining can also be the value of the angle beta. This makes the inclined shape of the small end face of the positive cone tube approach the inclined shape of the small end face of the target eccentric cone tube 10. In step S142, the large end face of the positive cone pipe may be cut to obtain a machined large end face. The machined large end face and the machined small end face can be parallel, and the distance between the machined large end face and the machined small end face is ensured to be the same as the height of the target eccentric cone pipe 10. This makes it possible to make the overall shape of the forward tapered tube after the cutting process similar to that of the target eccentric tapered tube 10. In step S143, since the cross sections of the machined large end surface and the machined small end surface are elliptical rings, the elliptical rings need to be shaped into circular rings (i.e., the elliptical holes are shaped into circles), and the diameters of the shaped circular holes are made to be correspondingly the same as the diameters of the holes on the two end surfaces of the target eccentric cone tube 10. This results in an eccentric cone tube that is identical to the target eccentric cone tube 10, so that the difficulty of manufacture and the load-bearing capacity are optimized. In some other embodiments, because the length of one eccentric cone pipe is larger, the eccentric cone pipe can be divided into a plurality of small eccentric cone pipes, and finally the small eccentric cone pipes are connected to form the eccentric cone pipe with the larger length integrally, so that the axial welding seam of the whole eccentric cone pipe is also avoided.
In some embodiments, WD ≦ Md1, where WD is the outer diameter of the outer ring blank 30 and Md1 is the maximum length to accommodate the small end face of the cone tube 20.
In this embodiment, the ring blank may be flared to form the final product. This allows the outer diameter WD of the outer ring blank 30 to be less than or equal to the maximum length Md1 of the minor end surface 21 of the female cone (see fig. 7). Since the maximum length Md1 of the small end surface 21 of the containing taper pipe includes the part of the small end surface of the target eccentric taper pipe 10, the size of one end of the outer die for forging the outer expanded ring blank 30 is Md1, and the outer diameter WD of the outer expanded ring blank 30 is set to be Md1 or less, so that the outer expanded ring blank 30 is conveniently placed in the forging outer die, thereby improving the forging efficiency.
In some embodiments of the present invention, the,
wherein WH is the length of the outer expanding ring blank 30, MH is the height of the accommodating cone tube 20, and MD1 is the maximum length of the large end face of the accommodating cone tube 20.
In the present embodiment, as shown in fig. 7 and 8, in the case of the outwardly expanded ringWhen the blank 30 is subjected to the outward-expanding forging process, the length of the outward-expanding ring blank 30 can be gradually shortened in the machining process, and the forged length needs to be more than or equal to the height MH of the included cone tube 20, so that the forged length can be larger than or equal to the height MH of the included cone tube 20
Therefore, the problem that the height of the forged forward cone pipe of the external expanding ring blank 30 is not enough, and the final eccentric cone pipe cannot be obtained is avoided. By increasing the compensation quantity (MD 1-Md 1) ((0.6 to 1)/2), the problem that the height of the positive cone tube is not enough can be avoided, materials can be saved, and the cost can be reduced.
In some embodiments, the wall thickness of one end of the flared ring blank 30 is greater than or equal to the wall thickness of the other end; the inner wall of the flared ring blank 30 extends smoothly from one end to the other.
In the present embodiment, as shown in fig. 8, the wall thickness of one end of the outward expansion ring blank 30 is W δ 1, and the wall thickness of the other end is W δ 2, where W δ 1 is equal to or greater than W δ 2. The inner wall of the flared ring blank 30 may extend smoothly from one end to the other. In this way, the end with the thickness W δ 1 can be regarded as a large end surface after the outward expansion, and the end with the thickness W δ 2 can be regarded as a small end surface after the outward expansion, wherein the diameter of the small end surface is smaller than that of the large end surface. Since the material required for the small end face is smaller than the material for the large end face, by setting W δ 1 to be equal to or greater than W δ 2, the movement of the small end face material to the large end face can be reduced, thereby improving forging efficiency. Further, W δ 1 can be made larger than W δ 2, so that the forging effect is better.
In some embodiments, ND ≦ MD1, where ND is the outer diameter of the inner shrink ring blank 40 and MD1 is the maximum length of the large end face of the encompassing cone tube 20.
In this embodiment, the ring blank may be retracted to form the final product. This makes it possible to make the outer diameter ND of the inner shrink ring blank 40 smaller than or equal to the maximum length MD1 of the large end surface 22 of the accommodating cone (see fig. 7). Since the maximum length MD1 of the large end surface 22 of the containing taper pipe includes the portion of the large end surface of the target eccentric taper pipe 10, the dimension of one end of the outer die for forging the outer expanded ring blank 30 is MD1, and by setting the outer diameter ND of the inner contracted ring blank 40 to be MD1 or less, it is convenient to put the inner contracted ring blank 40 into the forging outer die, thereby improving the forging efficiency.
In some embodiments, NH = (0.9 to 1) × L, where NH is the length of the inner shrink ring blank 40, and L is the length of a bus of the containing cone tube 20 on the symmetry plane of the target eccentric cone tube 10.
In this embodiment, when the machining is performed by the female forging, the length NH of the female ring blank 40 is extended. The length NH of the inner shrink ring blank 40 is set to be (0.9 to 1) times of the length L of a bus of the containing cone tube 20 on the symmetrical plane of the target eccentric cone tube 10, so that the length of the bus of the positive cone tube formed after the forging of the inner shrink ring blank 40 is larger than the length L of the bus of the containing cone tube 20. Therefore, machining allowance is reserved when the forward cone pipe is machined subsequently. According to the ductility of the material, NH = (0.9 to 0.95) × L can be further caused, so that tailings of subsequent cutting processing can be reduced, and the production cost is reduced.
In some embodiments, the wall thickness of the inner collar blank 40 is greater than or equal to the wall thickness of the other end; the inner wall of the inner collar blank 40 extends smoothly from one end to the other.
In the present embodiment, as shown in fig. 9, the wall thickness of one end of the inner shrink ring blank 40 is N δ 1, and the wall thickness of the other end is N δ 2, where N δ 1 is equal to or greater than N δ 2. The inner wall of the inner collar blank 40 may extend smoothly from one end to the other. In this way, one end with a wall thickness N δ 1 can be regarded as a large end face after retraction, and one end with a wall thickness N δ 2 can be regarded as a small end face after retraction, wherein the diameter of the small end face is smaller than that of the large end face. Since the material required for the small end face is smaller than the material for the large end face, by setting N δ 1 to be equal to or greater than N δ 2, the movement of the material for the small end face to the large end face can be reduced, thereby improving the forging efficiency. Further, N δ 1 can be made larger than N δ 2, so that the forging effect is better.
In some embodiments, N δ 1= (0.9 to 0.95) × δ, wherein N δ 1 is the wall thickness of one end of the inner shrink ring blank 40; n δ 2= (0.85 to 0.9) ×, where N δ 2 is the wall thickness of the other end of the inner shrink ring blank 40.
In this embodiment, as shown in fig. 9, since the circumferential side wall of the inner shrink ring blank 40 is pressed and shrunk in the inner shrink forging process, which may increase the finally formed wall thickness relative to the wall thickness of the inner shrink ring blank 40, the wall thickness of the inner shrink ring blank 40 may be set to be smaller than the wall thickness δ of the target eccentric cone tube 10, wherein the wall thickness N δ 1= (0.9 to 0.95) = δ at one end of the inner shrink ring blank 40 may be used as a forged large end face, and the wall thickness N δ 2= (0.85 to 0.9) = δ at the other end of the inner shrink ring blank 40 may be used as a forged small end face, so that the material usage amount may be reduced, and the movement of the small end face material to the large end face may be reduced, thereby improving the forging efficiency.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of the present disclosure and that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure in practice.
Claims (10)
1. A method for machining an eccentric cone pipe, comprising:
s11, obtaining an containing body of the target eccentric cone pipe based on the appearance size of the target eccentric cone pipe;
s12, obtaining the outer diameter, the length and the wall thickness of an external expanding ring blank based on the maximum length of the small end face of the containing body, the height of the containing body and the weight of the target eccentric cone pipe; and/or obtaining the outer diameter, the length and the wall thickness of the inner shrink ring blank based on the maximum length of the large end face of the containing body, the length of the bus of the containing body and the wall thickness delta of the target eccentric cone tube;
step S13, forging and allowance processing removal are carried out on the outer expanding ring blank or the inner contracting ring blank, and a positive cone pipe is obtained;
and S14, cutting and rounding the two end parts of the forward cone pipe to obtain the target eccentric cone pipe.
2. The method of claim 1, wherein the machining of the eccentric cone pipe is performed by a machining tool,
the containing body is set to be a containing cone pipe with the minimum volume containing the target eccentric cone pipe; the peripheral body of the target eccentric cone pipe is a part of the peripheral body containing the cone pipe; the end surface of the containing cone pipe is vertical to an angular bisector of an included angle of body sidelines on two sides of the target eccentric cone pipe on the symmetrical plane of the target eccentric cone pipe; the two end faces of the containing cone pipe are parallel.
3. The method of claim 2, wherein the machining of the eccentric cone pipe is performed by a machining tool,
WD is not more than Md1, wherein WD is the outer diameter of the outer expanding ring blank, and Md1 is the maximum length of the small end face of the containing cone pipe.
4. The method of claim 3, wherein the machining of the eccentric cone pipe is performed by a machining tool,
5. The method of claim 3, wherein the machining of the eccentric cone pipe is performed by a machining tool,
the wall thickness of one end of the outer expanding ring blank is greater than or equal to that of the other end of the outer expanding ring blank; the inner wall of the external expanding ring blank smoothly extends from one end to the other end.
6. The method of claim 2, wherein the machining of the eccentric cone pipe is performed by,
ND is not more than MD1, wherein ND is the outer diameter of the inner shrink ring blank, and MD1 is the maximum length of the large end face of the containing cone tube.
7. The method of claim 6, wherein the machining of the eccentric cone pipe is performed by a machining tool,
NH = (0.9 to 1) × L, wherein NH is the length of the inner shrink ring blank, and L is the length of a bus of the containing cone pipe on the symmetry plane of the target eccentric cone pipe.
8. The method of claim 6, wherein the machining of the eccentric cone pipe is performed by a machining tool,
the wall thickness of one end of the inner shrink ring blank is greater than or equal to that of the other end of the inner shrink ring blank; the inner wall of the inner shrink ring blank smoothly extends from one end to the other end.
9. The method of claim 8, wherein the machining of the eccentric cone pipe is performed by a machining tool,
n δ 1= (0.9 to 0.95) ×, wherein N δ 1 is the wall thickness of one end of the inner shrink ring blank; and N delta 2= (0.85 to 0.9) ×, wherein the N delta 2 is the wall thickness of the other end of the inner shrink ring blank.
10. The method of claim 1, wherein the step S14 comprises:
step S141, cutting the small end face of the right cone pipe to obtain a machined small end face; on a symmetrical plane after the small end face of the positive cone pipe is cut, the size of an included angle between a projection line of the machined small end face and a side line of the side body of the positive cone pipe is a value of an angle beta; beta is an included angle between a small end face projection line of the target eccentric cone pipe and a side line of the side body of the forward cone pipe on a symmetrical plane of the target eccentric cone pipe;
step S142, cutting the large end face of the positive cone pipe to obtain a processed large end face; the processed big end face is parallel to the processed small end face; the distance between the machined large end face and the machined small end face is the height of the target eccentric cone pipe;
and S143, shaping the machined small end face hole and the machined large end face hole into circles to obtain the target eccentric cone pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310213833.5A CN115890170B (en) | 2023-03-08 | 2023-03-08 | Eccentric cone tube processing method |
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