CN112916649A - Forming die and forming method for small-caliber thick-wall hemispherical square pipe - Google Patents
Forming die and forming method for small-caliber thick-wall hemispherical square pipe Download PDFInfo
- Publication number
- CN112916649A CN112916649A CN202110452214.2A CN202110452214A CN112916649A CN 112916649 A CN112916649 A CN 112916649A CN 202110452214 A CN202110452214 A CN 202110452214A CN 112916649 A CN112916649 A CN 112916649A
- Authority
- CN
- China
- Prior art keywords
- die body
- forming
- small
- die
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000003466 welding Methods 0.000 claims abstract description 30
- 230000003014 reinforcing effect Effects 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 21
- 238000000465 moulding Methods 0.000 claims description 8
- 239000000314 lubricant Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims 2
- 239000010959 steel Substances 0.000 claims 2
- 238000005452 bending Methods 0.000 description 4
- 238000007373 indentation Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- 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
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
Abstract
The invention discloses a forming die of a small-caliber thick-wall hemispherical square pipe, which comprises an upper die and a lower die which are matched with each other, wherein the upper die comprises an upper die body, the upper die body is fixedly connected with an upper supporting plate through a connecting plate, the die comprises a lower die body, the lower die body is fixedly connected with a lower supporting plate, a forming cavity for containing a blank is formed in the lower die body, and the outline of the outer bottom surface of the upper die body and the outline of the inner surface of the lower forming cavity are respectively corresponding to the outline of the 1/2 pipe outside and the outline of the small-caliber thick-wall hemispherical square pipe transversely cut along; the invention also discloses a forming method, which comprises the steps of fixing the die on a press machine, putting the die into a blank for punch forming, obtaining 1/2 pipes with the hemispherical dome pipe transversely cut along the central line, and obtaining a target product through pairing and welding. According to the invention, through limiting and matching the outer bottom surface of the upper die body and the inner surface profile of the forming cavity, one-step forming is realized by stamping, and the precision and quality of the pipe with the hemispherical dome shape are improved; the method is simple and easy to implement.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a forming die and a forming method of a small-caliber thick-wall hemispherical square tube.
Background
The pipe is a transition connecting piece which can realize butt joint of a square opening and a round opening, and is widely applied to the industries of chemical engineering, buildings, ships and the like. The common forming process of the pipe with the round top and the square bottom mainly comprises bending, rolling and tailor welding, and the forming process is mainly applied to forming the pipe with the round mouth with larger diameter and the thin wall with the round top and the square bottom. For small-caliber thick-wall hemispherical square pipes, the bending forming process has deeper indentation and is difficult to process due to small caliber; the diameter of a roller shaft is required to be smaller than the diameter of a round opening of a square tube of a small-caliber thick-wall in a rolling process, and a common rolling bed is difficult to meet the molding requirement of the square tube of the small-caliber thick-wall; welding deformation caused by the tailor welded structure is difficult to control, and particularly when the wall thickness of the material is thick, the welding amount is further increased, so that the deformation is more difficult to control. For the forming of the small-caliber thick-wall hemispherical square tube, the quality problems of high cost, deep indentation, large welding deformation, poor forming surface quality, poor shape and size control and the like of the traditional forming process are difficult to solve.
Disclosure of Invention
The invention aims to solve the technical problem of providing a forming die of a small-caliber thick-wall hemispherical square tube aiming at the defects of the prior art. The forming die comprises an upper die and a lower die which are matched with each other, the outer bottom surface contour of an upper die body and the inner surface contour of a forming cavity are correspondingly matched with the inner contour and the outer contour of 1/2 tubes transversely cut along the central line of a small-caliber thick-wall hemispherical tube respectively, so that the outer bottom surface of the upper die body is matched with the inner surface of the forming cavity and acts, the small-caliber thick-wall hemispherical tube is obtained by stamping a blank in one step, the shape, size and surface quality of the small-caliber thick-wall hemispherical tube are effectively improved, and the forming cost is reduced.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a forming die of small-bore thick wall sky circle local pipe, its characterized in that, is including the last mould and the lower mould of mutually supporting, it includes the mould body to go up the mould, go up the mould body and pass through connecting plate and last backup pad fixed connection, and go up the outer bottom surface profile of mould body and small-bore thick wall sky circle local pipe 1/2 intraductal profile of central line crosscut unanimous, the lower mould includes the lower mould body, lower mould body and bottom suspension fagging fixed connection, and set up the one-tenth die cavity that holds the blank on the lower mould body, the internal surface profile of one-tenth die cavity is unanimous with small-bore thick wall sky circle local pipe 1/2 outside of.
The forming die for the small-caliber thick-wall hemispherical square pipe is characterized in that a plurality of upper connecting grooves are formed in the side face of the upper supporting plate, and a plurality of lower connecting grooves are correspondingly formed in the side face of the lower supporting plate.
The forming die for the small-caliber thick-wall hemispherical square pipe is characterized in that the upper die body and the upper supporting plate are fixedly connected to the upper end face and the lower end face of the connecting plate respectively through welding.
The forming die for the small-caliber thick-wall hemispherical square pipe is characterized in that a plurality of upper reinforcing rib plates are arranged on the side wall of the connecting plate and are connected between the bottom surface of the upper supporting plate, the top surface of the upper die body and the side wall of the connecting plate through welding and fixing and are symmetrically arranged along the connecting plate.
The forming die for the small-caliber thick-wall hemispherical square pipe is characterized in that the lower die body is fixedly connected to the lower supporting plate through welding.
The forming die for the small-caliber thick-wall hemispherical square pipe is characterized in that a plurality of lower reinforcing rib plates are arranged on the side wall of the lower die body and are connected between the top surface of the lower supporting plate and the side wall of the lower die body through welding and fixing and are symmetrically arranged along the lower die body.
The forming die for the small-caliber thick-wall hemispherical square pipe is characterized in that a positioning pin is fixedly arranged on the front end face of the upper die body, and a positioning nut matched with the positioning pin is correspondingly and fixedly arranged on the front end face of the lower die body.
The forming die for the small-caliber thick-wall hemispherical square pipe is characterized in that positioning blocks are arranged on two sides of the top surface of a cavity in the lower die body and connected to the lower die body through spot welding.
In addition, the invention also discloses a forming method of the forming die adopting the small-caliber thick-wall hemispherical square pipe, which is characterized by comprising the following steps:
firstly, connecting a bolt through an upper connecting groove on a supporting plate and a bolt connecting hole at a corresponding position of an upper platform of a press machine, screwing the bolt to fix an upper die and the upper platform of the press machine, then connecting the bolt through a lower connecting groove on a lower supporting plate and the bolt connecting hole at a corresponding position of a lower platform of the press machine, and screwing the bolt to fix a lower die and the lower platform of the press machine at a corresponding position of the upper supporting plate;
step two, starting the press machine, adjusting the mounting positions of the upper die and the lower die to enable the vertical surface of the upper die body to be superposed with the vertical surface of the lower die body, and then smearing a lubricant on the R arc area of the forming cavity on the lower die body;
step three, placing the blank on the top surface of the lower die body coated with the lubricant in the step two, starting a press machine to drive an upper die and the lower die to be closed, and performing punch forming to obtain an 1/2 pipe with a hemispherical dome pipe transversely cut along a central line;
and step four, repeating the punch forming process in the step three to obtain 1/2 pipes of the other cycloidal-epicyclical pipe transversely cut along the central line, then removing the splicing allowance of the 1/2 pipes of the two cycloidal-epicyclical pipes transversely cut along the central line obtained in the step three and the step four according to the size requirement of the target product cycloidal-epicyclical pipe, and then pairing, welding and removing the allowance at two ends to obtain the small-caliber thick-wall cycloidal-epicyclical pipe.
According to the invention, a blank is placed on the top surface of the lower die body, then the upper die and the lower die are driven by a press machine to be matched, one-step punch forming is carried out, 1/2 tubes with the hemispherical dome tube transversely cut along the central line are obtained, and then 1/2 tubes with the hemispherical dome tube transversely cut along the central line are subjected to allowance removal, assembly, welding and allowance removal at two ends, so that the small-caliber thick-wall hemispherical dome tube is obtained.
The forming method is characterized in that in the second step, the position of the positioning pin on the front end face of the upper die body corresponds to the position of the positioning nut on the front end face of the lower die body by adjusting, so that the middle vertical plane of the upper die body is enabled to be coincident with the middle vertical plane of the lower die body.
Compared with the prior art, the invention has the following advantages:
1. the forming die comprises an upper die and a lower die which are matched with each other, the outer bottom surface contour of the upper die body and the inner surface contour of the forming cavity are correspondingly consistent with the inner contour and the outer contour of 1/2 tubes transversely cut along the central line of the small-caliber thick-wall hemispherical square tube, so that the outer bottom surface of the upper die body is matched with the inner surface of the forming cavity and acts on the inner surface of the forming cavity, the blank is punched and formed in one step to obtain the small-caliber thick-wall hemispherical square tube, the shape size precision and the surface quality of the small-caliber thick-wall hemispherical square tube are effectively improved, and the forming cost is reduced.
2. According to the forming die, the reinforcing rib plates are arranged on the side walls of the connecting plates, so that pressure is fully dispersed and uniformly transmitted to the upper die body, the deformation of the connecting plates caused by overlarge pressure is avoided, and the quality of the small-caliber thick-wall hemispherical square tube is ensured.
3. According to the forming die, the lower reinforcing rib plate is arranged on the side wall of the lower die body, so that pressure is fully dispersed and uniformly transmitted to act on a blank, uniform stamping is realized, and the shape, size and precision and quality of the small-caliber thick-wall hemispherical square tube are improved.
4. According to the forming die, the positioning pin arranged on the front end face of the upper die body is matched and connected with the positioning nut arranged on the front end face of the lower die body, so that the upper die body and the lower die body are aligned and matched, and quick and accurate positioning is realized.
5. According to the forming die, the positioning block is arranged, so that the blank is accurately positioned in the stamping process, the blank is prevented from shifting in the stamping process, and the shape, size and quality of the small-caliber thick-wall hemispherical square tube are guaranteed.
6. Compared with the existing preparation method, the forming die is only suitable for small-caliber thin-wall hemispherical and square tubular pipes with round-mouth calibers smaller than 168mm and wall thicknesses of 5 mm-8 mm, or for large-caliber thick hemispherical and square tubular pipes with wall thicknesses larger than 16mm and calibers of 800 mm-1000 mm or even larger, the forming die is suitable for manufacturing hemispherical and square tubular pipes with round-mouth calibers smaller than 168mm, square-mouth calibers smaller than 190mm multiplied by 190mm and wall thicknesses larger than 16mm, and the preparation efficiency and the quality of finished products are both improved.
7. According to the invention, the blank is subjected to one-step punch forming to obtain 1/2 pipes transversely cut along the central line of the square pipe, and then the small-caliber thick-wall square pipe is obtained through assembly welding, so that the serious problems of over deep indentation, wall thickness reduction and the like caused by a bending process are effectively reduced, the problems of deformation and the like caused by large welding amount in a tailor welding process are also avoided, and the forming size and quality requirements of the small-caliber thick-wall square pipe are ensured.
8. The method improves the processing and forming efficiency, has the characteristics of simple and reliable process, convenient processing, low production cost and the like, and is convenient for continuous production.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic view of an assembly structure of the forming die of the present invention.
Fig. 2 is a schematic structural view of an upper die of the forming die of the invention.
Fig. 3 is a front view of the upper mold of the forming mold of the present invention.
Fig. 4 is a rear view of the upper die of the forming die of the present invention.
FIG. 5 is a schematic structural view of a lower mold of the forming mold of the present invention.
FIG. 6a is a front view of the lower mold of the forming mold of the present invention.
Fig. 6b is an enlarged view of a in fig. 6 a.
Fig. 7a is a rear view of the lower mold of the molding die of the present invention.
Fig. 7B is an enlarged view of B in fig. 7 a.
Fig. 8 is a schematic view of the structure of the blank used in the forming method of the present invention.
Fig. 9 is a structural schematic diagram of 1/2 tube with skyline tube transected along the centerline obtained by the present invention.
FIG. 10 is a schematic structural view of a pipe having a hemispherical dome shape obtained by the present invention.
Description of reference numerals:
1, an upper die; 1-upper connecting groove; 1-2-upper supporting plate;
1-3-connecting plate; 1-4-upper die body; 1-5-a locating pin;
1-6-upper reinforcing rib plate; 2, lower die; 2-1-positioning block;
2-lower die body; 2-3-lower support plate; 2-4-forming cavity;
2-4-1-a first arc segment; 2-4-2-second arc segment; 2-4-3-transition arc section;
2-4-a third arc segment; 2-4-5-a first straight line segment; 2-4-6-fourth arc segment;
2-4-7-second straight-line segment; 2-4-8-a fifth arc segment; 2-4-9-third straight line segment;
2-4-10-sixth arc segment; 2-5-positioning nut; 2-6-lower reinforcing rib plate;
2-7-lower connecting groove.
Detailed Description
The molding die of the present invention is described in detail by example 1.
Example 1
As shown in fig. 1 to 5, 6a to 6b and 7a to 7b, the forming die for the small-caliber thick-wall pipe includes an upper die 1 and a lower die 2 which are engaged with each other, the upper die 1 comprises an upper die body 1-4, the upper die body 1-4 is fixedly connected with an upper supporting plate 1-2 through a connecting plate 1-3, and the outline of the outer bottom surface of the upper die body 1-4 is consistent with the inner outline of 1/2 tube which is transversely cut along the central line of the small-caliber thick-wall hemispherical square tube, the lower die 2 comprises a lower die body 2-2, the lower die body 2-2 is fixedly connected with a lower support plate 2-3, and a forming cavity 2-4 for containing blanks is formed in the lower die body 2-2, and the inner surface contour of the forming cavity 2-4 is consistent with the outer contour of 1/2 tubes transversely cutting the small-caliber thick-wall hemispherical square tube along the central line.
As shown in fig. 6a to 6b and fig. 7a to 7b, the front end surface of the forming cavity 2-4 in this embodiment is formed by sequentially connecting a first arc segment 2-4-1, a transition arc segment 2-4-3 and a second arc segment 2-4-2; the rear end face of the molding cavity 2-4 in this embodiment is formed by sequentially connecting a third arc segment 2-4-4, a first straight segment 2-4-5, a fourth arc segment 2-4-6, a second straight segment 2-4-7, a fifth arc segment 2-4-8, a third straight segment 2-4-9 and a sixth arc segment 2-4-10. The forming cavity 2-4 is internally formed by a region in which the first arc section 2-4-1 on the front end surface is transited to the third arc section 2-4-4 on the rear end surface and a region in which the second arc section 2-4-2 on the front end surface is transited to the sixth arc section 2-4-10 on the rear end surface, so that the R arc region of the forming cavity 2-4 is formed.
The forming die of the embodiment comprises an upper die 1 and a lower die 2 which are mutually matched, wherein an upper die body 1-4 in the upper die 1 is fixedly connected with an upper supporting plate 1-2 through a connecting plate 1-3, a lower die body 2-2 in the lower die 2 is fixedly connected with a lower supporting plate 2-3, the outer bottom surface contour of the upper die body 1-4 is defined to be consistent with the inner contour of 1/2 tube of the small-caliber thick-wall pipe along the transverse direction of the central line, the inner surface contour of a forming cavity 2-4 is defined to be consistent with the outer contour of 1/2 tube of the small-caliber thick-wall pipe along the transverse direction of the central line, so that a space for accommodating 1/2 tube of the small-caliber thick-wall pipe along the transverse direction of the central line is formed between the outer bottom surface of the upper die body 1-4 and the inner surface of the forming cavity 2-4, and in, connecting the lower support plate 2-3 with a lower platform of a press machine, driving the outer bottom surface of the upper die body 1-4 to be matched and acted with the inner surface of the forming cavity 2-4 through the upper platform of the press machine, punching the blank 3, directly obtaining 1/2 tubes of the small-caliber thick-wall hemispherical square tube transversely cut along the central line through punching one-step forming, and symmetrically and fixedly connecting 1/2 tubes of two small-caliber thick-wall hemispherical square tubes transversely cut along the central line through subsequent processes such as assembly and assembly welding to obtain the small-caliber thick-wall hemispherical square tube. The embodiment adopts die punch forming, solves the problems that the indentation of the bending forming process is too deep, the wall thickness is difficult to thin and the rolling process is difficult to form a small-caliber pipe, and simultaneously avoids the problem that the thick-wall pipe is easy to deform due to large welding amount of the tailor-welding process, effectively improves the shape and size precision of the pipe at the dome, improves the surface quality of the pipe at the dome and reduces the forming cost.
Further, as shown in fig. 1, 2 and 5, in this embodiment, a side surface of the upper support plate 1-2 is provided with a plurality of upper connecting grooves 1-1, and a side surface of the lower support plate 2-3 is correspondingly provided with a plurality of lower connecting grooves 2-7. The upper connecting groove 1-1 and the lower connecting groove 2-7 are respectively arranged on the side faces of the upper supporting plate 1-2 and the lower supporting plate 2-3 to be correspondingly matched with the positions of connecting bolt holes on an upper platform and a lower platform of a press machine, and then the upper die 1 is fixed with the upper platform of the press machine through bolt connection, so that the lower die 2 is fixed with the lower platform of the press machine, and the subsequent forming process is guaranteed to be smoothly carried out.
Further, in this embodiment, the upper mold body 1-4 and the upper support plate 1-2 are fixedly connected to the upper and lower end surfaces of the connecting plate 1-3 by welding, respectively. The arrangement effectively ensures the connection stability among the upper die body 1-4, the upper support plate 1-2 and the connecting plate 1-3, enhances the usability of the forming die and is beneficial to ensuring the smooth forming of the small-caliber thick-wall hemispherical square tube.
Further, as shown in fig. 1 to 4, a plurality of upper reinforcing rib plates 1 to 6 are arranged on the side walls of the connecting plates 1 to 3 in this embodiment, and the upper reinforcing rib plates 1 to 6 are fixedly connected between the bottom surface of the upper supporting plate 1 to 2, the top surface of the upper die body 1 to 4 and the side walls of the connecting plates 1 to 3 by welding and are symmetrically arranged along the connecting plates 1 to 3. In the embodiment, the plurality of upper reinforcing rib plates 1-6 are symmetrically arranged on the connecting plate 1-3, so that the pressure of the pressure head of the press machine acting on the supporting plate 1-2 in the stamping forming process is fully dispersed on the connecting plate 1-3 and the upper reinforcing rib plates 1-6 and is uniformly transmitted to the upper die body 1-4, and the phenomenon that the connecting plate 1-3 is deformed due to overlarge pressure is avoided, so that the quality of the small-caliber thick-wall hemispherical square pipe is influenced.
Furthermore, in the embodiment, the number of the upper reinforcing rib plates 1-6 is 8, and 4 pieces of reinforcing rib plates are symmetrically arranged on two sides of the connecting plate 1-3. Aiming at the sizes of a press machine and a corresponding die used in actual operation, the upper reinforcing rib plates 1-6 with the optimized number and structure can effectively disperse the pressure of a pressure head, simplify the structure and save materials.
Further, in the present embodiment, the lower mold body 2-2 is fixedly connected to the lower support plate 2-3 by welding. The arrangement effectively ensures the connection stability between the lower die body 2-2 and the lower supporting plate 2-3, enhances the stability of the whole structure of the lower die and is beneficial to ensuring the smooth molding of the small-caliber thick-wall hemispherical square pipe.
Further, as shown in fig. 1 and fig. 6a to 6b and fig. 7a to 7b, in this embodiment, a plurality of lower reinforcing rib plates 2-6 are disposed on the side wall of the lower die body 2-2, and the lower reinforcing rib plates 2-6 are fixedly connected between the top surface of the lower support plate 2-3 and the side wall of the lower die body 2-2 by welding and symmetrically disposed along the lower die body 2-2. In the embodiment, the plurality of lower reinforcing rib plates 2-6 are symmetrically arranged on the side wall of the lower die body 2-2, so that in the stamping forming process, the pressure borne by the lower supporting plate 2-3 is fully dispersed on the lower reinforcing rib plates 2-6 and is uniformly transmitted to the lower die body 2-2 to act on the blank 3 contained in the forming cavity 2-4, uniform stamping is realized, and the shape, size and precision of the small-caliber thick-wall hemispherical square pipe are improved.
Furthermore, the number of the lower reinforcing rib plates 2-6 in the embodiment is 8, and 4 pieces of reinforcing rib plates are symmetrically arranged on two sides of the lower die body 2-2. According to the size of the press machine and the corresponding die used in actual operation, the lower reinforcing rib plates 2-6 with the optimal number and the optimal structure not only effectively disperse the pressure on the lower supporting plates 2-3, but also simplify the structure and save materials.
Further, as shown in fig. 1, 2 to 3, 5 and 6a, in this embodiment, a front end surface of the upper die body 1-4 is fixedly provided with a positioning pin 1-5, and a front end surface of the lower die body 2-2 is correspondingly and fixedly provided with a positioning nut 2-5 engaged with the positioning pin 1-5. In the embodiment, the positioning pins 1-5 and the positioning nuts 2-5 matched with the positioning pins are respectively arranged on the front end surfaces of the upper die body 1-4 and the lower die body 2-2, and the upper die body 1-4 and the lower die body 2-2 are aligned and matched through the matching connection relationship of the positioning pins 1-5 and the positioning holes formed in the positioning nuts 2-5, so that the rapid and accurate positioning is realized, and the smooth forming is facilitated.
Further, as shown in fig. 1, 5, 6a and 7a, in this embodiment, positioning blocks 2-1 are disposed on two sides of the top surface of the cavity 2-4 in the lower die body 2-2, and the positioning blocks 2-1 are connected to the lower die body 2-2 by spot welding. By arranging the positioning block 2-1, the blank is accurately positioned in the stamping process, and meanwhile, the blank is prevented from shifting in the stamping process, so that the shape, size and quality of the small-caliber thick-wall hemispherical square tube are ensured.
Furthermore, in the present embodiment, the number of the positioning blocks 2-1 is 6, and 3 positioning blocks are symmetrically arranged on two sides of the top surface of the molding cavity 2-4. The positioning precision and speed are improved by the arrangement of the quantity and distribution of the positioning blocks 2-1.
The molding method of the present invention is described in detail by example 2.
Example 2
The embodiment comprises the following steps:
firstly, a bolt penetrates through an upper connecting groove 1-1 on a supporting plate 1-2 to be connected with a bolt connecting hole at a corresponding position of an upper platform of a press machine, and the bolt is screwed down to enable an upper die 1 and the upper platform of the press machine to be fixed and to reciprocate up and down along with the upper platform of the press machine; then, bolts penetrate through lower connecting grooves 2-7 on the lower supporting plates 2-3 to be connected with bolt connecting holes at corresponding positions of a lower platform of the press machine, and the bolts are screwed down to enable the lower die 2 and the lower platform of the press machine to be fixed at corresponding positions of the upper supporting plates 1-2;
step two, starting a press machine, adjusting the mounting positions of an upper die 1 and a lower die 2, enabling a vertical surface of the upper die body 1-4 to coincide with a vertical surface of the lower die body 2-2 by adjusting the position correspondence of a positioning pin 1-5 on the front end surface of the upper die body 1-4 and a positioning nut 2-5 on the front end surface of the lower die body 2-2, and then smearing a lubricant on an R arc area of a forming cavity 2-4 on the lower die body 2-2;
step three, placing the blank on the top surface of the lower die body 2-2 coated with the lubricant in the step two, starting a press machine to drive the upper die 1 and the lower die 2 to be matched, and performing punch forming to obtain 1/2 pipes with the hemispherical dome pipe transversely cut along the central line;
the structure of the blank is shown in fig. 8, the length of the front end of the blank in fig. 8 is a, the length of the rear end of the blank in fig. 8 is b, the lengths of the two sides of the blank are c, and 8mm of allowance is left in the length of the front end, the length of the rear end and the lengths of the two sides of the blank; the 1/2 tube structure of the tube at the skyline and the tube at the other place transversely crossed along the central line is shown in fig. 9, the perimeter of the C surface of the front end surface of the tube in fig. 9 is equal to the length a of the front end of the blank in step three, the perimeter of the D surface of the back end surface of the tube is equal to the length b of the back end of the blank in step three, and the lengths of the E surfaces and the F surface of the upper end surfaces at two sides, namely the height h of the 1/2 tube transversely crossed along the central line of the skyline and the blank 3 at two sides are equal to the length C of the blank.
And step four, repeating the punch forming process in the step three to obtain a 1/2 pipe of the other hemispherical dome pipe transversely cut along the central line, then removing the splicing allowance of the E surface and the F surface of the 1/2 pipe transversely cut along the central line of the two hemispherical dome pipes obtained in the step three and the step four according to the size requirement of the target product hemispherical dome pipe, and then obtaining the hemispherical dome pipe by assembling, welding and removing the allowance of two ends, namely the C surface of the front end surface of the pipe and the D surface of the rear end surface of the pipe, as shown in fig. 10, the A surface and the B surface in fig. 10 are respectively the front end surface and the rear end surface of the hemispherical dome pipe, and the height h of the hemispherical dome pipe is equal to the height h of the 1/2 pipe transversely cut along the central line of the hemispherical dome pipe.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (10)
1. A forming die for a small-caliber thick-wall hemispherical square pipe is characterized by comprising an upper die (1) and a lower die (2) which are matched with each other, the upper die (1) comprises an upper die body (1-4), the upper die body (1-4) is fixedly connected with an upper supporting plate (1-2) through a connecting plate (1-3), and the outline of the outer bottom surface of the upper die body (1-4) is consistent with the inner outline of 1/2 tube which is transversely cut along the central line of the small-caliber thick-wall hemispherical square tube, the lower die (2) comprises a lower die body (2-2), the lower die body (2-2) is fixedly connected with a lower supporting plate (2-3), and a forming cavity (2-4) for containing blanks is formed in the lower die body (2-2), and the inner surface profile of the forming cavity (2-4) is consistent with the outer profile of 1/2 tubes transversely cutting the small-caliber thick-wall hemispherical square tube along the central line.
2. The forming die of the small-caliber thick-wall hemispherical square tubular product as claimed in claim 1, wherein the side surface of the upper support plate (1-2) is provided with a plurality of upper connecting grooves (1-1), and the side surface of the lower support plate (2-3) is correspondingly provided with a plurality of lower connecting grooves (2-7).
3. The forming die for the small-caliber thick-wall hemispherical square tubular steel pipe as claimed in claim 1, wherein the upper die body (1-4) and the upper support plate (1-2) are fixedly connected to the upper and lower end faces of the connecting plate (1-3) respectively by welding.
4. The forming die for the small-caliber thick-wall hemispherical square tubular steel pipe is characterized in that a plurality of upper reinforcing rib plates (1-6) are arranged on the side wall of the connecting plate (1-3), and the upper reinforcing rib plates (1-6) are fixedly connected between the bottom surface of the upper supporting plate (1-2), the top surface of the upper die body (1-4) and the side wall of the connecting plate (1-3) through welding and are symmetrically arranged along the connecting plate (1-3).
5. The forming die for the small-caliber thick-wall hemispherical square tubular product as claimed in claim 1, wherein the lower die body (2-2) is fixedly connected to the lower support plate (2-3) by welding.
6. The forming die for the small-caliber thick-wall hemispherical square tubular product according to claim 1, wherein a plurality of lower reinforcing rib plates (2-6) are arranged on the side wall of the lower die body (2-2), and the lower reinforcing rib plates (2-6) are fixedly connected between the top surface of the lower support plate (2-3) and the side wall of the lower die body (2-2) through welding and are symmetrically arranged along the lower die body (2-2).
7. The forming die for the small-caliber thick-wall pipe with the hemispherical dome shape as claimed in claim 1, wherein a positioning pin (1-5) is fixedly arranged on the front end face of the upper die body (1-4), and a positioning nut (2-5) matched with the positioning pin (1-5) is correspondingly and fixedly arranged on the front end face of the lower die body (2-2).
8. The forming die of the small-caliber thick-wall pipe with the hemispherical dome shape as claimed in claim 1, wherein the two sides of the top surface of the cavity (2-4) in the lower die body (2-2) are provided with positioning blocks (2-1), and the positioning blocks (2-1) are connected to the lower die body (2-2) through spot welding.
9. A method of forming a small-caliber thick-wall pipe using the forming die for a pipe having a hemispherical shape as claimed in any one of claims 1 to 8, comprising the steps of:
firstly, bolts penetrate through upper connecting grooves (1-1) on supporting plates (1-2) to be connected with bolt connecting holes in corresponding positions of an upper platform of a press machine, the bolts are tightened to enable an upper die (1) to be fixed with the upper platform of the press machine, then the bolts penetrate through lower connecting grooves (2-7) on lower supporting plates (2-3) to be connected with the bolt connecting holes in corresponding positions of the lower platform of the press machine, and the bolts are tightened to enable a lower die (2) and the lower platform of the press machine to be fixed in corresponding positions of the upper supporting plates (1-2);
step two, starting the press machine, adjusting the mounting positions of the upper die (1) and the lower die (2) to enable the middle vertical surface of the upper die body (1-4) to be superposed with the middle vertical surface of the lower die body (2-2), and then smearing a lubricant on the R arc area of the forming cavity (2-4) on the lower die body (2-2);
thirdly, placing the blank on the top surface of the lower die body (2-2) coated with the lubricant in the second step, starting a press machine to drive the upper die (1) and the lower die (2) to be closed, and performing punch forming to obtain 1/2 pipes with the semicircular square pipes transversely cut along the central line;
and step four, repeating the punch forming process in the step three to obtain 1/2 pipes of the other cycloidal-epicyclical pipe transversely cut along the central line, then removing the splicing allowance of the 1/2 pipes of the two cycloidal-epicyclical pipes transversely cut along the central line obtained in the step three and the step four according to the size requirement of the target product cycloidal-epicyclical pipe, and then pairing, welding and removing the allowance at two ends to obtain the small-caliber thick-wall cycloidal-epicyclical pipe.
10. The molding method according to claim 9, wherein in the second step, the position of the positioning pin (1-5) on the front end surface of the upper mold body (1-4) is adjusted to correspond to the position of the positioning nut (2-5) on the front end surface of the lower mold body (2-2) so as to ensure that the vertical plane of the upper mold body (1-4) is coincident with the vertical plane of the lower mold body (2-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110452214.2A CN112916649A (en) | 2021-04-26 | 2021-04-26 | Forming die and forming method for small-caliber thick-wall hemispherical square pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110452214.2A CN112916649A (en) | 2021-04-26 | 2021-04-26 | Forming die and forming method for small-caliber thick-wall hemispherical square pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112916649A true CN112916649A (en) | 2021-06-08 |
Family
ID=76174739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110452214.2A Pending CN112916649A (en) | 2021-04-26 | 2021-04-26 | Forming die and forming method for small-caliber thick-wall hemispherical square pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112916649A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114871296A (en) * | 2022-04-08 | 2022-08-09 | 江苏新恒基特种装备股份有限公司 | Forming device and forming method for non-standard pipe fitting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004106030A (en) * | 2002-09-19 | 2004-04-08 | Sumitomo Metal Ind Ltd | Method and apparatus for manufacturing special shaped tube stock for hydraulic bulging |
| CN105880384A (en) * | 2016-05-03 | 2016-08-24 | 武汉船用机械有限责任公司 | Square-dome-shaped stamping tool for inflow pipeline of hydraulic jet propulsion device |
| DE102015005522A1 (en) * | 2015-04-30 | 2016-11-03 | Schomäcker Federnwerk GmbH | Method for producing a hollow body |
| CN208230669U (en) * | 2018-05-19 | 2018-12-14 | 中国水利水电第三工程局有限公司 | A kind of transition steel pipe auxiliary device for pressing |
| CN111872170A (en) * | 2020-07-31 | 2020-11-03 | 杭州鼎樊科技有限公司 | Steel plate bending machine with protection device for steel structure building |
| CN213002015U (en) * | 2020-06-30 | 2021-04-20 | 河北冶金建设集团有限公司 | Suppressing device for round sky and square earth structure |
-
2021
- 2021-04-26 CN CN202110452214.2A patent/CN112916649A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004106030A (en) * | 2002-09-19 | 2004-04-08 | Sumitomo Metal Ind Ltd | Method and apparatus for manufacturing special shaped tube stock for hydraulic bulging |
| DE102015005522A1 (en) * | 2015-04-30 | 2016-11-03 | Schomäcker Federnwerk GmbH | Method for producing a hollow body |
| CN105880384A (en) * | 2016-05-03 | 2016-08-24 | 武汉船用机械有限责任公司 | Square-dome-shaped stamping tool for inflow pipeline of hydraulic jet propulsion device |
| CN208230669U (en) * | 2018-05-19 | 2018-12-14 | 中国水利水电第三工程局有限公司 | A kind of transition steel pipe auxiliary device for pressing |
| CN213002015U (en) * | 2020-06-30 | 2021-04-20 | 河北冶金建设集团有限公司 | Suppressing device for round sky and square earth structure |
| CN111872170A (en) * | 2020-07-31 | 2020-11-03 | 杭州鼎樊科技有限公司 | Steel plate bending machine with protection device for steel structure building |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114871296A (en) * | 2022-04-08 | 2022-08-09 | 江苏新恒基特种装备股份有限公司 | Forming device and forming method for non-standard pipe fitting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102357645B (en) | The devices and methods therefor of round bar one step multidirectional combined shaping central flange pipe joint | |
| CN102303090B (en) | Device and method for compounding and forming central flange pipe joint from pipe blank in single-step and multi-directional way | |
| CN102641955B (en) | Mould capable of forming three-way pipe on one-way pressure machine and forming method thereof | |
| CN106424355A (en) | Annular thin-wall part molding die and molding method | |
| CN1042305C (en) | Forming technology for hollow sucker rod and mould thereof | |
| CN112916649A (en) | Forming die and forming method for small-caliber thick-wall hemispherical square pipe | |
| CN110586831A (en) | Die assembly for forging oblique connecting pipe and forging method | |
| CN106180257B (en) | Large plate list weld seam threeway forming process and forming device | |
| JPS61201926A (en) | Yoke member and its manufacture of iuniversal joint | |
| CN216881536U (en) | Upsetting forming die for flanged hollow long shaft | |
| CN216680044U (en) | Large-scale step barrel forging die | |
| CN1807007A (en) | Production method of 90degreeelbow steel skeleton of composite tube and dedicated die therefor | |
| CN215903009U (en) | Minor diameter thin wall pipe non-full weld fillet weld internal stay frock | |
| CN214264298U (en) | Split type large-diameter screen drum | |
| CN209272279U (en) | Semi-circular plate compacting tool set | |
| CN2773381Y (en) | Bolt fixed on thin-plate and special manufacturing die | |
| CN210754919U (en) | Die assembly for forging oblique connecting pipe | |
| US8356396B2 (en) | Method for making threaded tube | |
| CN109773044B (en) | Semicircular plate pressing die and semicircular plate manufacturing method | |
| RU2071863C1 (en) | Method of manufacturing heads of wrenches | |
| CN114932185B (en) | Hollow ball cold heading process | |
| CN220480114U (en) | Accurate location structure of die forging bent axle blank | |
| CN113843591B (en) | High-speed forming process of chromium-zirconium-copper electrode cap for welding | |
| CN219073946U (en) | Extrusion die's device | |
| CN1087849A (en) | A kind of manufacturing process of container class end socket and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210608 |
|
| RJ01 | Rejection of invention patent application after publication |