Cavity die for forming annular piece

Abstract

The utility model discloses a cavity die for forming an annular piece, which comprises a die, a forming cavity is arranged in the die, and an annular bulge is coaxially arranged in the forming cavity; the two sides of the forming cavity are each provided with one set of pushing and pressing assembly, and the ends, close to the forming cavity, of the pushing and pressing assemblies extend into the forming cavity; the two guide sleeves are arranged in the forming cavity in a sliding mode, the two guide sleeves are located on the two sides of the annular protrusion correspondingly, the inner diameter of the guide sleeves is the same as that of the annular protrusion, and one end of the pushing and pressing assembly extends into the guide sleeves; first notches are formed in the two sides of the annular protrusion, and a second notch is formed in the end, close to the annular protrusion, of each guide sleeve. Through mutual cooperation of the arranged annular protrusion, the pushing and pressing assembly and the guide sleeve, the forming pressure of an annular pipe fitting can be effectively reduced when a small-radius fillet thin-wall annular piece is formed, the size precision and the die attaching effect of a formed workpiece are improved, and the forming performance of the pipe fitting is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of annular component forming, in particular to a cavity mold used for annular component forming. Background Art

[0002] The internal high pressure forming process is an advanced manufacturing technology that uses the tube as the blank to form the tube into the desired shape under the combined action of internal pressure and axial feeding. As an advanced metal plastic forming process, the internal high pressure forming technology has been widely used in many fields due to its advantages such as good forming quality, high forming efficiency and lightweight formed tubes.

[0003] However, in the prior art, when thin-walled annular tubes with small radius fillets are subjected to internal high pressure forming, the formed tubes often suffer from poor mold adhesion and insufficient dimensional and structural accuracy. To improve this phenomenon, the present application proposes a cavity mold for annular parts forming to solve such problems. Utility Model Content

[0004] Based on this, in order to solve the problems existing in the prior art, the present application provides a cavity mold for forming an annular part, including a mold, a forming cavity is arranged in the mold, and an annular protrusion is coaxially arranged in the forming cavity;

[0005] A pushing assembly is provided on both sides of the forming cavity, and one end of the pushing assembly close to the forming cavity extends into the forming cavity;

[0006] Guide sleeves, two guide sleeves are slidably arranged in the forming cavity, and the two sets of guide sleeves are respectively located on both sides of the annular protrusion, the inner diameter of the guide sleeves is the same as the inner diameter of the annular protrusion, and one end of the pushing assembly extends into the guide sleeves;

[0007] A first notch is formed on both sides of the annular protrusion, and a second notch is formed on one end of each guide sleeve close to the annular protrusion. When both sides of the annular protrusion are fitted with the guide sleeve, the first notch and the second notch form an annular groove opening toward the inside of the forming cavity.

[0008] Furthermore, a first arcuate surface is arranged in the first notch, a second arcuate surface is arranged in the second notch, and one end of the first arcuate surface is connected to one end of the second arcuate surface to form the bottom of the annular groove.

[0009] Furthermore, the second notch is also provided with a third arcuate surface, one end of the third arcuate surface is smoothly connected to the inner wall of the guide sleeve, and the other end of the third arcuate surface is smoothly connected to the other end of the second arcuate surface.

[0010] Furthermore, the pushing assembly includes a pushing head and a pushing rod, one end of the pushing rod is connected to the pushing head, and the other end of the pushing rod extends into the guide sleeve.

[0011] Furthermore, a washer is sleeved on the push rod.

[0012] Furthermore, the mold includes a first module and a second module, and the first module and the second module are detachably connected.

[0013] Beneficial effect: Through the cooperation of the annular protrusion, the pushing assembly and the guide sleeve, the forming pressure of the annular pipe can be effectively reduced when forming a thin-walled annular part with a small radius fillet, thereby improving the dimensional accuracy and mold-fitting effect of the formed workpiece and the forming performance of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the assembly of the cavity mold for forming an annular part of the utility model;

[0016] Figure 2 It is an exploded view of the cavity mold for forming annular parts of the utility model;

[0017] Figure 3 It is a schematic cross-sectional structure diagram of a cavity mold for forming an annular part according to the utility model;

[0018] Figure 4 It is a schematic diagram of the ring-shaped member structure of the cavity mold for forming the ring-shaped member of the utility model;

[0019] Figure 5 for Figure 3 Enlarged view of point A in the middle;

[0020] Figure 6 It is a schematic diagram of the forming process of the cavity mold used for forming an annular part of the utility model;

[0021] In the figure: 1. mold; 11. first module; 12. second module; 13. annular protrusion; 131. first notch; 1311. first curved surface; 2. pushing assembly; 21. pushing head; 22. pushing rod; 3. guide sleeve; 31. second notch; 311. second curved surface; 312. third curved surface; 4. annular member; 41. first curved portion; 42. second curved portion; 5. gasket.

[0022] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B; in addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0026] like Figure 1-4 As shown, the embodiment of the present application provides a cavity mold for forming an annular part, including a mold 1, a forming cavity is provided in the mold 1, and an annular protrusion 13 is coaxially provided in the forming cavity;

[0027] A pushing assembly 2, a group of pushing assemblies 2 are respectively arranged on both sides of the forming cavity, and one end of the pushing assembly 2 close to the forming cavity extends into the forming cavity;

[0028] Guide sleeve 3, two guide sleeves 3 are slidably arranged in the forming cavity, and the two guide sleeves 3 are respectively located on both sides of the annular protrusion 13, the inner diameter of the guide sleeve 3 is the same as the inner diameter of the annular protrusion 13, and one end of the pushing component 2 extends to the inside of the guide sleeve 3;

[0029] A first notch 131 is formed on both sides of the annular protrusion 13, and a second notch 31 is formed on one end of each guide sleeve 3 close to the annular protrusion 13. When the two sides of the annular protrusion 13 are fitted with the guide sleeve 3, the first notch 131 and the second notch 31 form an annular groove opening toward the inside of the forming cavity.

[0030] In this embodiment, when working, the ring member 4 with the same inner diameter as the guide sleeve 3 is first placed in the forming cavity, and high-pressure liquid is filled into the tube blank of the ring member 4, and then the forming is started. At the beginning, the pushing components 2 at both ends are axially fed in the direction close to the annular protrusion 13. At this time, the tube blank of the ring member 4 begins to bulge freely. With the continuous feeding of the pushing component 2, the guide sleeve 3 will contact the free bulging part of the tube blank of the ring member 4 and shape the bulging part of the tube blank. At this time, the bulging part of the tube blank of the ring member 4 will extend to the inside of the first notch 131 and the second notch 31 respectively. At this time, the ring member 4 The tube blank will also slowly fit the inner wall of the first notch 131 and the second notch 31 to achieve a better film-sticking effect. After the pushing component 2 is fed for a distance, the guide sleeve 3 starts to move synchronously under the drive of the pushing component 2. Under the extrusion of the internal high-pressure liquid and the guide sleeve 3, the tube blank of the ring part 4 inside the annular groove is shaped. When the protrusion of the ring part 4 contacts the guide sleeve 3, the first notch 131 and the second notch 31 form an annular groove, and the shaping is completed. At this time, the ring part 4 and the protrusion of the ring part 4 will completely fit the mold 1, and a qualified ring part 4 is obtained.

[0031] The shape of the protruding portion of the formed annular member 4 matches the shape of the annular groove, and the protrusion includes a first curved portion 41 and a second curved portion 42;

[0032] By cooperating with the annular protrusion 13, the pushing assembly 2 and the guide sleeve 3, the forming pressure of the annular pipe can be effectively reduced when forming the thin-walled annular part 4 with a small radius fillet, thereby improving the dimensional accuracy and mold-fitting effect of the formed workpiece and the forming performance of the pipe.

[0033] In one embodiment, the pushing assembly 2 includes a pushing head 21 and a pushing rod 22 , one end of the pushing rod 22 is connected to the pushing head 21 , and the other end of the pushing rod 22 extends into the guide sleeve 3 .

[0034] In this embodiment, during operation, the push head 21 drives the push rod 22 to move, and the push rod 22 drives the guide sleeve 3 to slide in the forming cavity.

[0035] In one embodiment, a washer 5 is sleeved on the push rod 22 .

[0036] In this embodiment, the washer 5 is sleeved on the push rod 22 and is located between the guide sleeve 3 and the push rod 22, and the number of the washers 5 is adjustable. By adjusting the number of washers 5 to change the distance between the guide sleeve 3 and the push head 21, the time when the guide sleeve 3 starts to move is controlled to control the free bulging time of the tube blank of the ring member 4;

[0037] Specifically, before the gasket 5 abuts against the guide sleeve 3, the tube blank of the ring part 4 is in a free expansion stage. When the gasket 5 abuts against the guide sleeve 3, it drives the guide sleeve to move synchronously. At this time, the free expansion of the tube blank of the ring part 4 stops, and the raised part of the tube blank of the ring part 4 begins to be shaped through the guide sleeve 3 and the internal high-pressure liquid, thereby achieving the effect of segmented advancement and obtaining a qualified workpiece.

[0038] In one embodiment, the mold 1 includes a first module 11 and a second module 12, and the first module 11 and the second module 12 are detachably connected.

[0039] In this embodiment, during assembly, the first module 11 and the second module 12 are aligned up and down to form the mold 1. By setting the mold 1 as a split form of the first module 11 and the second module 12, the flexibility of selecting the size of the formed workpiece can be achieved, and the parts of the mold 1 can be quickly replaced, making subsequent maintenance easier.

[0040] like Figure 5-6 As shown, in one embodiment, a first arcuate surface 1311 is disposed in the first notch 131 , a second arcuate surface 311 is disposed in the second notch 31 , and one end of the first arcuate surface 1311 is connected to the second arcuate surface 311 to form the bottom of the annular groove.

[0041] In this embodiment, the first arcuate surface 1311 and the second arcuate surface 311 are connected to fit with the second curved portion 42 of the ring member 4 after it is formed. The radii of the first arcuate surface 1311 and the second arcuate surface 311 are consistent with the radius of the second curved portion 42. Through the setting of the first arcuate surface 1311 and the second arcuate surface 311, the pressure during the forming of the ring member 4 can be shared to prevent the ring member 4 from rupturing due to the increase in internal pressure.

[0042] In one embodiment, the second notch 31 is further provided with a third arcuate surface 312 , one end of the third arcuate surface 312 is smoothly connected to the inner wall of the guide sleeve 3 , and the other end of the third arcuate surface 312 is smoothly connected to the other end of the second arcuate surface 311 .

[0043] In this embodiment, the third arc surface 312 fits the second curved portion 42 of the ring member 4 after forming, and the radius of the third arc surface 312 is consistent with the radius of the second curved portion 42. By setting the third arc surface 312, the stress of the ring member 4 during bending can be reduced.

[0044] The working principle of a cavity mold 1 for forming a ring member 4 is as follows:

[0045] Assembling mold 1: placing both ends of the ring 4 in the guide sleeve 3, then placing the ring 4 tube blank and the guide sleeve 3 in the forming cavity, then aligning the first module 11 and the second module 12 up and down to close the mold, and finally placing the required number of washers 5 between the corresponding push rods 22;

[0046] Free expansion of the tube blank: high-pressure liquid is injected into the tube blank of the ring member 4. At the same time, the push heads 21 on both sides drive the push rods 22 to axially feed and extrude the tube blank inward. At this time, the tube blank of the ring member 4 begins to enter a free expansion state until the gasket 5 contacts the guide sleeve 3;

[0047] Small radius fillet forming: The push rod 22 drives the guide sleeves 3 on both sides to feed inward, and squeezes the free bulging area of ​​the ring member 4 tube blank, so that this part of the material is deformed into the inner annular groove and gradually forms a small radius fillet;

[0048] Workpiece shaping: The guide sleeve 3 is fed inwardly. When the protrusion of the ring member 4 contacts the guide sleeve 3, the first notch 131 and the second notch 31 form an annular groove, and the pressure of the high-pressure liquid inside the tube blank of the ring member 4 is increased to shape the tube blank inside the annular groove. After the shaping is completed, the desired workpiece is obtained.

[0049] The present application adopts a one-mold two-piece method to form parts, which can effectively improve production efficiency, shorten production cycle, and further reduce production costs.

[0050] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A cavity mold for forming a ring part, characterized in that: include: A mold, wherein a forming cavity is provided in the mold, and an annular protrusion is coaxially provided in the forming cavity; A pushing assembly, wherein a group of the pushing assemblies are respectively arranged on both sides of the forming cavity, and one end of the pushing assembly close to the forming cavity extends into the forming cavity; A guide sleeve, wherein two guide sleeves are slidably disposed in the forming cavity, and the two guide sleeves are respectively located on both sides of the annular protrusion, the inner diameter of the guide sleeve is the same as the inner diameter of the annular protrusion, and one end of the pushing assembly extends into the interior of the guide sleeve; A first notch is formed on both sides of the annular protrusion, and a second notch is formed on one end of each guide sleeve close to the annular protrusion. When the two sides of the annular protrusion are fitted with the guide sleeve, the first notch and the second notch form an annular groove opening toward the inside of the forming cavity.

2. The cavity mold for forming an annular part according to claim 1, characterized in that: A first arcuate surface is disposed in the first notch, a second arcuate surface is disposed in the second notch, and one end of the first arcuate surface is connected to one end of the second arcuate surface to form the bottom of the annular groove.

3. The cavity mold for forming an annular part according to claim 2, characterized in that: The second notch is further provided with a third arcuate surface, one end of the third arcuate surface is smoothly connected to the inner wall of the guide sleeve, and the other end of the third arcuate surface is smoothly connected to the other end of the second arcuate surface.

4. The cavity mold for forming an annular part according to claim 1, characterized in that: The pushing assembly comprises a pushing head and a pushing rod, one end of the pushing rod is connected to the pushing head, and the other end of the pushing rod extends into the interior of the guide sleeve.

5. The cavity mold for forming an annular part according to claim 4, characterized in that: A washer is sleeved on the push rod.

6. The cavity mold for forming an annular part according to claim 1, characterized in that: The mold comprises a first module and a second module, and the first module and the second module are detachably connected.

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