CN114769498A - Oil pipe joint and production process for same - Google Patents
Oil pipe joint and production process for same Download PDFInfo
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- CN114769498A CN114769498A CN202210438811.4A CN202210438811A CN114769498A CN 114769498 A CN114769498 A CN 114769498A CN 202210438811 A CN202210438811 A CN 202210438811A CN 114769498 A CN114769498 A CN 114769498A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/14—Making machine elements fittings
- B21K1/16—Making machine elements fittings parts of pipe or hose couplings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The application relates to an oil pipe joint and a production process for the oil pipe joint, wherein a cold header is used for processing the following step S1, and one end of an original blank is subjected to cold heading and shaping to form a chamfer; s2, cold heading the un-chamfered end of the blank to form a first inner hole; s3, continuously carrying out cold upsetting on the first inner hole of the blank along the axial direction of the first inner hole to form a second inner hole, and simultaneously carrying out cold upsetting on the chamfered end of the blank to form a third inner hole; s4, continuously carrying out cold heading on the third inner hole of the blank along the axial direction of the third inner hole until the third inner hole is communicated with the second inner hole to form a channel; s5, cold heading the blank into a first section and a second section which are connected with the same shaft, and performing chamfer transition between the first section and the second section to form a fifth semi-finished blank; and S6, cold heading and shaping the fifth semi-finished blank into a small-diameter section, a medium-diameter section and a large-diameter section which are connected with the coaxial shaft to form the oil pipe joint. Whole oil pipe connects and is stretched earlier the through-hole for the tie point between minor diameter section, the middle diameter section and the major diameter section is difficult for appearing unstablely, thereby has improved the yields.
Description
Technical Field
The application relates to the field of hardware spare and accessory parts, in particular to an oil pipe joint and a production process for the oil pipe joint.
Background
Cold heading is a forging method for upsetting and forming a metal bar at normal temperature by utilizing a die. The head part is usually used for manufacturing screws, bolts, rivets, etc., and in the related art, the head part is also used for processing hardware such as oil pipe joints, etc.
In machining the oil pipe joint 4 as in fig. 1, with reference to fig. 2, the steps are as follows: 1. obtaining a blank; 2. performing cold heading on the blank material by a cold heading process for one-step deformation, so that the blank material forms a small-diameter section 1 and a large-diameter section 3; 3. performing cold heading on the blank material by a cold heading process for secondary deformation, so that the blank material forms a small-diameter section 1, a middle-diameter section 2 and a large-diameter section 3; 4. cold heading the blank material by a cold heading process such that the small diameter section 1 of the blank material forms a first inner bore 42; 5. cold heading the blank material through a cold heading process to enable the large-diameter section 3 of the blank material to form a second inner hole 43; 6. the blank is cold headed by a cold heading process so that the first inner bore 42 and the second inner bore 43 on the blank close to form the passage 45.
In the actual course of working, when closing the hole, can arouse the unstable of the tie point of little diameter section and medium diameter section, the tie point of medium diameter section and large diameter section, easily produce unqualified product, the yields is lower.
Disclosure of Invention
In order to improve the yield of the product,
on one hand, the production process for the oil pipe joint adopts the following technical scheme:
a production process for an oil pipe joint comprises the following processing steps by using a cold header
S1, cold heading one end of the original blank to shape a chamfer to form a first semi-finished blank;
s2, cold heading the un-chamfered end of the first semi-finished blank to form a first inner hole to form a second semi-finished blank;
s3, continuously carrying out cold upsetting on the first inner hole of the second semi-finished blank along the axial direction of the first inner hole to form a second inner hole, and simultaneously carrying out cold upsetting on the chamfered end of the second semi-finished blank to form a third inner hole so as to form a third semi-finished blank;
s4, continuously carrying out cold heading on the third inner hole of the third semi-finished blank along the axial direction of the third inner hole until the third inner hole is communicated with the second inner hole to form a channel, and forming a fourth semi-finished blank;
s5, cold heading and shaping the fourth semi-finished blank into a first section and a second section which are coaxially connected, wherein the diameter of the first section is larger than that of the second section, the diameter of the first section is smaller than or equal to that of the third semi-finished blank, the first section and the second section are in chamfer transition, and the length of a channel is increased under the condition that the diameter is not changed to form a fifth semi-finished blank;
s6, cold heading and shaping the fifth semi-finished blank into a small-diameter section, a medium-diameter section and a large-diameter section which are coaxially connected, wherein the large-diameter section and the medium-diameter section are both formed by shaping the first section, and the oil pipe joint is formed.
Through adopting above-mentioned technical scheme, whole oil pipe connects and is earlier the through-hole redrawing for the tie point between little diameter section, the medium diameter section and the big diameter section is difficult for appearing unstably, thereby has improved the yields. And meanwhile, the outer surface of the oil pipe joint is shaped finally, so that the outer surface of the oil pipe joint is higher in precision after cold heading is finished, and the oil pipe joint is convenient to finish in the follow-up process.
Optionally, the cold heading machine includes the fifth cold heading mould that is used for realizing step S5, the fifth cold heading mould includes fifth die block unit and fifth die unit, fifth forming groove has been seted up on the fifth die block unit, fifth die unit includes the fifth upper die base, installs and is used for leading mould, fifth drive assembly in the fifth of pushing into the fifth forming groove with fourth semi-manufactured goods blank, coaxial sliding connection in the fifth outer die on the fifth upper die base, lead in the fifth mould is used for inserting the passageway.
Through adopting above-mentioned technical scheme, when the cold-heading, the fifth internal guide die can insert in the fourth semi-manufactured goods blank earlier to make the fourth semi-manufactured goods blank better completion heart before the cold-heading, namely the concentricity between the passageway that gets the fourth semi-manufactured goods blank and the fifth one-tenth type groove is better, makes the product wall thickness everywhere that the processing was come out more accord with the expectation and sets for, reduces because the product outer wall fracture scheduling problem that eccentric processing leads to, has improved the yields. Meanwhile, the fifth inner guide die can also play a role in stabilizing the channel, so that the diameter of the channel can be kept stable in the cold heading process, the problem that the diameter of the channel changes due to excessive deformation of the inner wall of the channel caused by the extrusion force received by the outer surface of the blank is solved, and the product quality is improved.
Optionally, the fifth forming groove includes a first forming section corresponding to the first section and a second forming section corresponding to the second section, and the length of the first forming section is greater than or equal to that of the fourth semi-finished blank.
By adopting the technical scheme, the fourth semi-finished blank can be completely pushed into the first forming section and then starts to deform, so that the probability that the fourth semi-finished blank overflows out of the fifth forming groove in the cold heading shaping process is reduced, the fourth semi-finished blank is completely positioned in the fifth forming groove during cold heading, the temperatures of all parts are kept close to each other as far as possible, the probability of incomplete shaping, cracking and foaming is reduced, and the fifth semi-finished blank has better yield.
Optionally, second shaping section intercommunication fifth die block unit deviates from fifth die unit one end, sliding connection has first supporting shaft in the second shaping section, the first connecting seat of first supporting shaft one end fixedly connected with, be equipped with first elastic component between first connecting seat and the fifth die block unit, first elastic component is used for ordering about first supporting shaft and moves to the position that first supporting shaft terminal surface flushed towards fifth die unit one end terminal surface with fifth die block unit.
By adopting the technical scheme, the fourth semi-finished blank can be supported by the first supporting shaft in the whole processing process of the step S5, so that the fourth semi-finished blank can move towards the bottom of the fifth forming groove more stably. And the fourth semi-finished blank is always limited by the first supporting shaft in the shaping process of the fourth semi-finished blank, so that the fourth semi-finished blank can slowly overflow the space of the whole fifth forming groove, and the shaping precision of the fourth semi-finished blank is improved.
Optionally, in step S4, a flare is formed at one end of the channel.
Through adopting above-mentioned technical scheme to make in fifth interior guide mode can be more stable smooth and easy inserts the passageway.
Alternatively, step S5 includes the steps of,
s5.1, driving a fifth upper die base and a fifth inner guide die to synchronously move downwards through a fifth driving assembly until the fifth inner guide die completely passes through the channel;
s5.2, the fifth driving assembly continues to drive the fifth upper die holder and the fifth inner guide die to synchronously move downwards until the fourth semi-finished blank completely enters the first forming section, and at the moment, the first supporting shaft is pushed to one end, close to the second forming section, of the first forming section by the fifth inner guide die;
and S5.3, setting the first section length as a, the second section length as b and the length of the fourth semi-finished blank as c, and driving the fifth upper die base and the fifth inner guide die to do differential motion by the fifth driving assembly, so that when the fifth upper die base moves towards the fifth bottom die unit by c-a, the fifth inner guide die moves towards the fifth bottom die unit by a + b-c.
By adopting the technical scheme, the processing precision of the product is further improved, and the fifth semi-finished blank formed by shaping has higher yield.
Optionally, a first caulking groove for a fifth inner guide die to be inserted into is formed in the upper end of the first support shaft; in step S5.1, the fifth inner guide die moves downward to a position where one end of the fifth inner guide die is inserted into the first caulking groove and abuts against the inner wall of the first caulking groove.
Through adopting above-mentioned technical scheme for the coaxial affirmation of completion that leads mould and first supporting axle in the fifth is better, thereby makes and all has better concentricity between fourth semi-manufactured goods blank and the fifth interior guide die and the fifth profiled groove, makes the product precision of processing out higher.
Optionally, a ventilation channel is formed in the first support shaft, one end of the ventilation channel is communicated with the first connecting seat, and the other end of the ventilation channel is communicated with the outer wall of the first support shaft; when the first support shaft is in the position of the step S5.1, the ventilation flow channel is communicated with the first section, and when the first support shaft is in the position of the step S5.2, one end of the ventilation flow channel is sealed by the side wall of the second section.
Through adopting above-mentioned technical scheme, accessible ventilation channel bloies towards fifth profiled groove cell wall after the cold-heading is accomplished at every turn, reduces because the impurity that cold-heading and detained in fifth profiled groove to improve subsequent machining precision.
Optionally, the ventilation runner includes sprue and a plurality of runner, the sprue sets up and the first joint chair of one end intercommunication along first supporting shaft axial, runner is equipped with a plurality of along first supporting shaft circumference, the first supporting shaft outer wall of runner one end intercommunication sprue and one end intercommunication, runner is the slope setting, just runner intercommunication sprue one end is located the first supporting shaft outer wall one end of runner intercommunication and is close to first joint chair one side.
Through adopting above-mentioned technical scheme to make fifth profiled groove everywhere all can be better blown by the air current that comes out in the ventilation runner, reduce the impurity that stays in fifth profiled groove.
On the other hand, the oil pipe joint provided by the application adopts the following technical scheme:
an oil pipe joint is manufactured by using a production process for the oil pipe joint, and the length ratio of the small-diameter section to the large-diameter section is 0.35-0.8.
Through adopting above-mentioned technical scheme, reduce the probability that the product ftractures because the deflection that single cold-heading needs is too big.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the processing precision of the product is improved;
2. the yield and the quality of the product are improved;
3. the processing technology is optimized.
Drawings
Fig. 1 is a schematic structural view of an oil pipe joint in the related art.
Fig. 2 is a schematic view of a process for manufacturing an oil pipe joint according to the related art.
FIG. 3 is a schematic structural view of embodiment 1.
Fig. 4 is a schematic diagram showing the change of the blank with each processing step in example 2.
Fig. 5 is a schematic structural view of a fifth cold-heading die in example 3.
Fig. 6 is a schematic view showing the use of the fifth cold-heading die in example 3.
Fig. 7 is a schematic structural view of a sixth cold-heading die in example 3.
Fig. 8 is a schematic view showing the use of a sixth cold-heading die in example 3.
Description of reference numerals: 1. a small diameter section; 2. a medium diameter section; 3. a large diameter section; 4. an oil pipe joint; 5. a first semi-finished blank; 6. a second semi-finished blank; 7. a third semi-finished blank; 8. a fourth semi-finished blank; 9. a first stage; 10. a second stage; 11. a fifth semi-finished blank; 12. a fifth bottom die unit; 13. a fifth die unit; 14. a fifth forming groove; 15. a first forming section; 16. a second molding section; 17. a first support shaft; 18. a first connecting seat; 19. a first elastic member; 20. a fifth upper die holder; 21. a fifth outer die; 22. a fifth inner guide die; 23. a first caulking groove; 24. a ventilation flow passage; 25. a main flow passage; 26. a secondary flow passage; 27. a fifth cold heading die; 28. a sixth cold heading die; 29. a sixth bottom die unit; 30. a sixth die unit; 31. a sixth forming groove; 32. a third forming section; 33. a fourth molding section; 34. a fifth molding section; 35. a second support shaft; 36. a second connecting seat; 37. a second elastic member; 38. a sixth upper die holder; 39. a sixth outer die; 40. a sixth inner guide die; 41. a second caulking groove; 42. a first inner bore; 43. a second inner bore; 44. a third inner bore; 45. a channel.
Detailed Description
The present application is described in further detail below with reference to figures 3-8.
Example 1
The embodiment 1 of the application discloses an oil pipe joint. Referring to fig. 3, a tubing joint includes a small-diameter section 1, a medium-diameter section 2, and a large-diameter section 3 coaxially connected in this order. The oil pipe joint 4 is provided with a channel 45 along the axis thereof, and the channel 45 is connected with two ends of the oil pipe joint 4. The aperture of the channel 45 is 6.5-7 mm. The diameter of the small-diameter section 1 is 10-11 mm, and the length of the small-diameter section 1 is 25-35 mm. The diameter of the middle diameter section 2 is 13-15 mm, and the length of the middle diameter section 2 is 5-15 mm. The diameter of the large-diameter section 3 is 15-17 mm, and the length of the large-diameter section 3 is 10-15 mm. Specifically, as shown in FIG. 3, the diameter of the channel 45 is 6.85 mm. The diameter of the small-diameter section 1 is 10.3mm, and the length of the small-diameter section 1 is 31 mm. The diameter of the medium diameter section 2 is 14mm, and the length of the medium diameter section 2 is 14 mm. The diameter of the large-diameter section 3 is 16.05mm, and the length of the large-diameter section 3 is 12 mm.
Example 2
The embodiment 2 of the application discloses a production process for an oil pipe joint. Referring to fig. 4, a production process for an oil pipe joint uses a cold header to perform the following processing steps,
s1, cold heading one end of the original blank to shape a chamfer to form a first semi-finished blank 5;
s2, cold heading the un-chamfered end of the first semi-finished blank 5 to form a first inner hole 42 to form a second semi-finished blank 6;
s3, continuously carrying out cold upsetting on the first inner hole 42 of the second semi-finished blank 6 along the axial direction of the first inner hole 42 to form a second inner hole 43, and simultaneously carrying out cold upsetting on the chamfered end of the second semi-finished blank 6 to form a third inner hole 44 to form a third semi-finished blank 7;
s4, continuously carrying out cold heading on the third inner hole 44 of the third semi-finished blank 7 along the axial direction of the third inner hole 44 until the second inner hole 43 is communicated to form a channel 45, wherein a flaring is formed at one end of the channel 45, and finally a fourth semi-finished blank 8 is formed;
s5, cold heading and shaping the fourth semi-finished blank 8 into a first section 9 and a second section 10 which are coaxially connected, wherein the diameter of the first section 9 is larger than that of the second section 10, the diameter of the first section 9 is smaller than or equal to that of the third semi-finished blank 7, the first section 9 and the second section 10 are in chamfer transition, the length of the channel 45 is increased under the condition that the diameter is not changed, and a fifth semi-finished blank 11 is formed;
s6, cold heading and shaping the fifth semi-finished blank 11 into a small-diameter section 1, a medium-diameter section 2 and a large-diameter section 3 which are coaxially connected, wherein the large-diameter section 3 and the medium-diameter section 2 are respectively formed by shaping a first section 9, and an oil pipe joint 4 is formed.
Example 3
The embodiment 3 of the application discloses a cold heading die set for a cold header. Referring to fig. 5 and 7, a cold heading die set for a cold heading machine includes a fifth cold heading die 27 for step S5 and a sixth cold heading die 28 for step S6.
Referring to fig. 5, the fifth cold-heading die 27 includes a fifth die unit 12 and a fifth die unit 13. The fifth bottom die unit 12 is provided with a fifth forming groove 14. The fifth forming groove 14 comprises a first forming section 15 for the first section 9 and a second forming section 16 for the second section 10, the first forming section 15 having a length greater than or equal to the fourth semi-finished blank 8. The second forming section 16 communicates with an end of the fifth die unit 12 facing away from the fifth die unit 13. A first supporting shaft 17 is slidably connected in the second forming section 16, a first connecting seat 18 is fixedly connected to one end of the first supporting shaft 17 penetrating out of the second forming section 16, and a first elastic member 19 is arranged between the first connecting seat 18 and the fifth bottom die unit 12. The first elastic member 19 is a spring, and two ends of the first elastic member 19 are respectively fixedly connected to the first connecting seat 18 and the fifth bottom die unit 12. The first elastic member 19 is used to urge the first support shaft 17 toward the fifth die unit 13 until the end surface of the first support shaft 17 is flush with the end surface of the fifth die unit 12 toward the fifth die unit 13.
Referring to fig. 5, the fifth die unit 13 includes a fifth upper die holder 20, a fifth outer die 21 mounted on the fifth upper die holder 20, a fifth inner guide die 22 coaxially slidably coupled in the fifth outer die 21, and a fifth driving assembly. The fifth upper die bed 20 is used for pushing the fourth semi-finished blank 8 into the fifth forming groove 14. The fifth inner guide die 22 is adapted to be inserted into the channel 45. The upper end of the first supporting shaft 17 is coaxially provided with a first caulking groove 23 for inserting the fifth inner guide die 22.
The fifth driving assembly is used for driving the fifth inner guide die 22 and the fifth outer punch die 21 to move along the respective axial directions. The fifth drive assembly comprises two electric cylinders, one for each of the fifth inner guide die 22 and the fifth outer punch 21. The fifth inner guide die 22 and the fifth outer punch die 21 are respectively moved in the axial direction thereof by an electric cylinder. The fifth drive assembly is not shown in the figures.
Referring to fig. 5, in order to improve the product quality, a ventilation flow passage 24 is formed in the first support shaft 17. The ventilation channel 24 includes a main channel 25 and a plurality of sub-channels 26, the main channel 25 is axially disposed along the first support shaft 17, and one end of the main channel is communicated with the first connection seat 18. The main flow passage 25 is connected to an air supply source, such as an air pump, at one end of the first connecting seat 18. A plurality of auxiliary flow passages 26 are arranged along the circumferential direction of the first support shaft 17, and one end of each auxiliary flow passage 26 is communicated with the main flow passage 25 and the outer wall of the first support shaft 17. The auxiliary channel 26 is disposed in an inclined manner, and one end of the auxiliary channel 26, which is communicated with the main channel 25, is located at one end of the auxiliary channel 26, which is communicated with the outer wall of the first supporting shaft 17, which is close to the first connecting seat 18.
Referring to fig. 5 and 6, when the fifth cold heading die 27 is used in step S5, the following steps are used:
s5.1, placing the fourth semi-finished blank 8 on the first support shaft 17, driving the fifth upper die holder 20 and the fifth inner guide die 22 to synchronously move downwards through the fifth driving assembly until the fifth inner guide die 22 completely passes through the channel 45 and is inserted into the first caulking groove 23, so that the fourth semi-finished blank 8, the fifth inner guide die 22 and the first support shaft 17 are all in a coaxial state; at this time, the ventilation flow passage 24 communicates with the first molding section 15;
s5.2, the fifth driving assembly continues to drive the fifth upper die holder 20 and the fifth inner guide die 22 to synchronously move downwards until the fourth semi-finished blank 8 completely enters the first forming section 15, and at the moment, the first supporting shaft 17 is pushed to one end, close to the second forming section 16, of the first forming section 15 by the fifth inner guide die 22; at this point, the vent passage 24 is closed at one end by the side wall of the second section 10.
And S5.3, setting the length of the first section 9 as a, the length of the second section 10 as b and the length of the fourth semi-finished blank 8 as c, driving the fifth upper die holder 20 and the fifth inner guide die 22 to do differential motion by the fifth driving assembly, so that when the fifth upper die holder 20 moves towards the fifth bottom die unit 12 by c-a, the fifth inner guide die 22 moves towards the fifth bottom die unit 12 by a + b-c, and finishing shaping the fourth semi-finished blank 8 to form the fifth semi-finished blank 11.
S5.4, the fifth driving assembly drives the fifth inner guide die 22 to move toward the fifth upper die holder 20 until the fifth inner guide die 22 leaves the channel 45, and then the fifth driving assembly drives the fifth upper die holder 20 away from the fifth bottom die unit 12, so that the fifth outer punch 21 leaves the fifth semi-finished blank 11, and the fifth semi-finished blank 11 is pushed away from the fifth forming groove 14 by the first supporting shaft 17; at this time, the ventilation channel 24 is communicated with the first section 9, and air is blown towards the groove wall of the fifth forming groove 14 through the ventilation channel 45, so that impurities retained in the fifth forming groove 14 due to cold heading are reduced, and subsequent processing precision is improved.
Referring to fig. 7, the sixth cold-heading die 28 includes a sixth die unit 29 and a sixth die unit 30. The sixth mold unit 29 has a sixth forming groove 31. The sixth forming groove 31 comprises a third forming section 32 for the large diameter section 3, a fourth forming section 33 for the medium diameter section 2, and a fifth forming section 34 for the small diameter section 1, the third forming section 32 having a length greater than or equal to the length of the first section 9 of the fifth semi-finished blank 11. The fifth forming section 34 communicates with an end of the sixth die unit 29 facing away from the sixth die unit 30. A second support shaft 35 is slidably connected in the fifth forming section 34, one end of the second support shaft 35, which penetrates through the fifth forming section 34, is fixedly connected with a second connecting seat 36, and a second elastic element 37 is arranged between the second connecting seat 36 and the sixth bottom die unit 29. The second elastic member 37 is a spring, and two ends of the second elastic member 37 are fixedly connected to the second connecting seat 36 and the sixth bottom die unit 29, respectively. The second elastic member 37 is used to drive the second support shaft 35 to move toward the sixth die unit 30 until the end surface of the second support shaft 35 is flush with the end surface of the sixth bottom die unit 29 toward the sixth die unit 30.
Referring to fig. 7, the sixth die unit 30 includes a sixth upper die holder 38, a sixth outer die 39 mounted on the sixth upper die holder 38, a sixth inner guide die 40 coaxially slidably coupled in the sixth outer die 39, and a sixth drive assembly. The sixth upper die holder 38 is used to push the fifth semi-finished blank 11 into the sixth forming groove 31. Sixth inner guide die 40 is adapted for insertion into passageway 45. The upper end of the second support shaft 35 is coaxially provided with a second caulking groove 41 for inserting the sixth inner guide die 40.
Referring to fig. 7, a sixth drive assembly is used to drive the sixth inner guide die 40 and the sixth outer punch 39 in respective axial directions. The sixth drive assembly comprises two electric cylinders, one for each of the sixth inner guide die 40 and the sixth outer punch 39. The sixth inner guide die 40 and the sixth outer punch 39 are moved in the axial direction thereof by electric cylinders, respectively. The sixth drive assembly is not shown in the figures.
Referring to fig. 7 and 8, when the sixth cold-heading die 28 is used in step S6, the following steps are used:
s6.1, placing the fifth semi-finished blank 11 on the second support shaft 35, driving the sixth upper die holder 38 and the sixth inner guide die 40 to synchronously move downwards through the sixth driving assembly until the sixth inner guide die 40 completely passes through the channel 45 and is inserted into the second caulking groove 41, so that the fifth semi-finished blank 11, the sixth inner guide die 40 and the second support shaft 35 are all in a coaxial state;
s6.2, the sixth driving assembly continues to drive the sixth upper die holder 38 and the sixth inner guide die 40 to synchronously move downward until the fifth semi-finished blank 11 completely enters the sixth forming groove 31, and at this time, the second support shaft 35 is pushed into the fifth forming section 34 by the sixth inner guide die 40.
S6.3, setting the length of the large-diameter section 3 to be d, the length of the middle-diameter section 2 to be e, and the length of the first section 9 to be a, driving the sixth upper die holder 38 and the sixth inner guide die 40 to do differential motion, so that when the sixth upper die holder 38 moves towards the sixth bottom die unit 29 by a-d, the sixth inner guide die 40 moves towards the sixth bottom die unit 29 by d + e-a, and the fifth semi-finished blank 11 is shaped to form the oil pipe joint 4.
S6.4, the sixth driving assembly drives the sixth inner guide die 40 to move towards the sixth upper die base 38 until the sixth inner guide die 40 leaves the passage 45, and then the sixth driving assembly drives the sixth upper die base 38 away from the sixth bottom die unit 29, so that the sixth outer punch 39 leaves the tubing joint 4, and the tubing joint 4 is pushed away from the sixth forming groove 31 by the second supporting shaft 35.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A production process for an oil pipe joint is characterized by comprising the following steps: the following processing steps were carried out using a cold header
S1, cold heading one end of the original blank to form a chamfer, and forming a first semi-finished blank (5);
s2, cold heading the non-chamfered end of the first semi-finished blank (5) to form a first inner hole (42) to form a second semi-finished blank (6);
s3, continuously carrying out cold heading on the first inner hole (42) of the second semi-finished blank (6) along the axial direction of the first inner hole (42) to form a second inner hole (43), and simultaneously carrying out cold heading on the chamfered end of the second semi-finished blank (6) to form a third inner hole (44) to form a third semi-finished blank (7);
s4, continuously carrying out axial cold heading on the third inner hole (44) of the third semi-finished blank (7) along the third inner hole (44) until the second inner hole (43) is communicated to form a channel (45) so as to form a fourth semi-finished blank (8);
s5, cold heading and shaping the fourth semi-finished blank (8) into a first section (9) and a second section (10) which are connected with the same shaft, wherein the diameter of the first section (9) is larger than that of the second section (10), the diameter of the first section (9) is smaller than or equal to that of the third semi-finished blank (7), the first section (9) and the second section (10) are in transition through a chamfer, and the length of the channel (45) is increased under the condition that the diameter is unchanged, so that a fifth semi-finished blank (11) is formed;
s6, cold heading and shaping the fifth semi-finished blank (11) into a small-diameter section (1), a middle-diameter section (2) and a large-diameter section (3) which are connected with the same shaft, wherein the large-diameter section (3) and the middle-diameter section (2) are formed by shaping the first section (9) to form the oil pipe joint (4).
2. The production process for the oil pipe joint according to claim 1, wherein: the cold heading machine comprises a fifth cold heading die (27) for realizing the step S5, the fifth cold heading die (27) comprises a fifth bottom die unit (12) and a fifth stamping die unit (13), the fifth bottom die unit (12) is provided with a fifth forming groove (14), the fifth stamping die unit (13) comprises a fifth upper die base (20), a fifth outer stamping die (21) and a fifth inner guide die (22) which are installed on the fifth upper die base (20) and used for pushing a fourth semi-finished blank (8) into the fifth forming groove (14), and a fifth driving assembly, the fifth inner guide die (22) is connected into the fifth outer stamping die (21) in a coaxial sliding mode, and the fifth inner guide die (22) is used for being inserted into the channel (45).
3. The production process for the oil pipe joint according to claim 2, wherein: the fifth forming groove (14) comprises a first forming section (15) corresponding to the first section (9) and a second forming section (16) corresponding to the second section (10), and the length of the first forming section (15) is greater than or equal to that of the fourth semi-finished blank (8).
4. The production process for the oil pipe joint according to claim 3, wherein: second shaping section (16) intercommunication fifth die block unit (12) deviates from fifth die unit (13) one end, sliding connection has first supporting shaft (17) in second shaping section (16), first supporting shaft (17) one end fixedly connected with first connecting seat (18), be equipped with first elastic component (19) between first connecting seat (18) and fifth die block unit (12), first elastic component (19) are used for ordering about first supporting shaft (17) and move to first supporting shaft (17) terminal surface and fifth die block unit (12) towards the position that fifth die unit (13) one end terminal surface flushed.
5. The production process for the oil pipe joint according to claim 4, wherein: in step S4, a flare is formed at one end of the passage (45).
6. The production process for the oil pipe joint according to claim 4, wherein: the step S5 includes the steps of,
s5.1, driving a fifth upper die holder (20) and a fifth inner guide die (22) to synchronously move downwards through a fifth driving assembly until the fifth inner guide die (22) completely passes through a channel (45);
s5.2, the fifth driving assembly continues to drive the fifth upper die holder (20) and the fifth inner guide die (22) to synchronously move downwards until the fourth semi-finished blank (8) completely enters the first forming section (15), and at the moment, the first supporting shaft (17) is pushed to one end, close to the second forming section (16), of the first forming section (15) by the fifth inner guide die (22);
and S5.3, setting the length of the first section (9) as a, the length of the second section (10) as b and the length of the fourth semi-finished blank (8) as c, and driving the fifth upper die holder (20) and the fifth inner guide die (22) to do differential motion by the fifth driving assembly, so that when the fifth upper die holder (20) moves towards the fifth bottom die unit (12) by c-a, the fifth inner guide die (22) moves towards the fifth bottom die unit (12) by a + b-c.
7. The production process for the oil pipe joint according to claim 6, wherein: a first caulking groove (23) for inserting a fifth inner guide die (22) is formed in the upper end of the first support shaft (17); in step S5.1, the fifth inner guide die (22) moves downward to a position where one end of the fifth inner guide die (22) is inserted into the first caulking groove (23) and abuts against the inner wall of the first caulking groove (23).
8. The production process for the oil pipe joint according to claim 6, wherein: a ventilation flow channel (24) is formed in the first support shaft (17), one end of the ventilation flow channel (24) is communicated with the first connecting seat (18), and the other end of the ventilation flow channel is communicated with the outer wall of the first support shaft (17); when the first supporting shaft (17) is located at the position of the step S5.1, the ventilation flow channel (24) is communicated with the first section (9), and when the first supporting shaft (17) is located at the position of the step S5.2, one end of the ventilation flow channel (24) is closed by the side wall of the second section (10).
9. The production process for the oil pipe joint according to claim 8, wherein: ventilation runner (24) include sprue (25) and a plurality of vice runner (26), sprue (25) are along first supporting axle (17) axial setting and the first connecting seat of one end intercommunication (18), vice runner (26) are equipped with a plurality of along first supporting axle (17) circumference, vice runner (26) one end intercommunication sprue (25) and the first supporting axle of one end intercommunication (17) outer wall, vice runner (26) are the slope setting, just vice runner (26) intercommunication sprue (25) one end is located vice runner (26) the first supporting axle of intercommunication (17) outer wall one end and is close to first connecting seat (18) one side.
10. An oil pipe joint which is characterized in that: the oil pipe joint is manufactured by using the production process for the oil pipe joint as claimed in claim 1, and the ratio of the length of the small-diameter section (1) to the length of the large-diameter section (3) is 0.35-0.8.
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| CN114769498B (en) | 2023-06-30 |
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