CN215391878U - Pipe forming punch and pipe forming equipment are pressed to card - Google Patents
Pipe forming punch and pipe forming equipment are pressed to card Download PDFInfo
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- CN215391878U CN215391878U CN202121708572.7U CN202121708572U CN215391878U CN 215391878 U CN215391878 U CN 215391878U CN 202121708572 U CN202121708572 U CN 202121708572U CN 215391878 U CN215391878 U CN 215391878U
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Abstract
The utility model discloses a clamping and pressing pipe forming punch and clamping and pressing pipe forming equipment, wherein the clamping and pressing pipe forming punch comprises an expanding section, a low-pressure sealing section, a high-pressure sealing section and an annular body, wherein the expanding section is used for conveniently entering a pipe blank; the high-pressure sealing section comprises an arc-shaped forming surface, and the forming surface is positioned at the front end of the annular body. The forming punch of the clamping and pressing pipe can effectively prevent stress concentration in the advancing process, so that the forming surface can be prevented from cracking, the service life of the punch is greatly prolonged, and the production cost is reduced.
Description
Technical Field
The utility model relates to internal high-pressure forming equipment, in particular to a clamping and pressing pipe forming punch and clamping and pressing pipe forming equipment.
Background
The principle of the inner high pressure forming is that a pipe is used as a blank, liquid such as water is used as a transmission medium, water with high pressure is injected into the pipe to generate pressure on the inner wall of the pipe, two ends of the pipe are sealed by punches, and material supplement is provided for pipe forming by axial feeding, so that the outer wall of the pipe is completely attached to a die cavity, and parts with required shapes are obtained. The forming of the clamping and pressing pipe is mainly realized by adopting an internal high-pressure forming mode, the clamping and pressing pipe comprises a sealing pipe body arranged at the end part, the sealing pipe body is a section of bulge outwards along the radial direction, and a cavity of the die comprises an annular arc cavity for forming the sealing pipe body; the punch comprises a low-pressure sealing section for performing low-pressure pre-expansion on the tube blank, a high-pressure sealing section for performing high-pressure expansion on the tube blank and an annular body connected with the high-pressure sealing section, wherein the front end of the annular body is provided with an arc-shaped forming surface; when the punch head is pushed forward to a proper position, the forming surface becomes a part of the annular arc cavity; the production flow of the clamping and pressing pipe is as follows, after the fixed die and the movable die are locked, the power cylinders positioned on two sides of the fixed die and the movable die drive the punches to be inserted into the inner cavity of the pipe blank, and are matched with the die cavity simultaneously, so that the magnitude of interference is generated on the pipe wall to form a closed cavity, and finally, a high-pressure medium is injected into the closed cavity by the high-pressure generating device, and the two punches move oppositely at the same time, so that the arc-shaped forming surface reaches the position of the annular arc cavity and becomes a part of the annular arc cavity, and the high-pressure medium enables the outer wall of the clamping and pressing pipe to be tightly attached to the die cavity for forming. However, the above punch has the following problems: in order to make the arc profile surface and the laminating of annular circular arc chamber more complete, the arc profile surface forms a closed angle with the outer disc junction of the ring body, because the stress concentration of closed angle, consequently when high pressure medium extrusion pipe blank is to annular circular arc chamber deformation, cause the bursting apart of arc profile surface easily, damage the drift, caused the loss of drift own cost on the one hand, on the other hand, frequently change the drift, need consume a large amount of time, seriously influenced the production progress, cause bigger loss.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a pressure clamping pipe forming punch which can effectively prevent stress concentration in the propelling process, so that the forming surface can be prevented from cracking, the service life of the punch is greatly prolonged, and the production cost is reduced.
The utility model also aims to provide a clamping and pressing pipe forming device comprising the forming punch.
The technical scheme for solving the technical problems is as follows:
a pressure pipe forming punch comprises a flaring section, a low-pressure sealing section, a high-pressure sealing section and an annular body, wherein the flaring section is used for conveniently entering a pipe blank; the high-pressure sealing section comprises an arc-shaped forming surface, and the forming surface is positioned at the front end of the annular body.
The working principle of the clamping pipe forming punch is as follows:
firstly, placing a pipe blank needing to be formed on a fixed die; then the hydraulic mold locking oil cylinder acts to drive the movable mold to move towards the fixed mold, so that the mold locking of the movable mold and the fixed mold is completed; next, the power oil cylinders positioned at two sides of the die act to drive the punches at two sides to be inserted into the inner cavity of the tube blank from two ends of the tube blank, the flaring section flares the tube blank, the pressure generating device injects a medium-pressure liquid medium into the inner cavity of the tube blank, the process is continued until the two ends of the tube blank are abutted against the annular body, the pressure of the medium-pressure liquid medium plays a role in pre-bulging the tube blank, and a certain gap is formed between the tube blank and the low-pressure sealing section; the power oil cylinder continues to act, the two punches continue to move in opposite directions, the pressure generating device injects a high-pressure liquid medium into the tube blank, the punches move forward to enable the forming surface to reach the position of an annular arc cavity in the die cavity, at the moment, the forming surface becomes a part of the annular arc cavity, under the pressure action of the high-pressure liquid medium, the inner wall of the tube blank deforms outwards and abuts against the inner wall of the die cavity, and therefore an annular sealing tube body is formed at the position of the annular arc cavity; after the forming surface reaches the position of the annular arc cavity in the die cavity, when the high-pressure medium makes the tube blank deform in the annular arc cavity, the forming surface receives huge pressure caused by the high-pressure medium and the deformation of the tube blank, and due to the fact that non-sharp-corner transition is adopted between the forming surface and the outer surface of the annular body, stress concentration is avoided through the non-sharp-corner transition, even if huge pressure impact is received, the forming surface can still be prevented from bursting apart, the service life of the punch is prolonged, and production cost is saved.
In a preferred embodiment of the present invention, the rear end of the flaring segment is connected to the front end of the low-pressure sealing segment along the advancing direction of the punch; the outer diameter of the annular body is larger than that of the low-pressure sealing section, the outer diameter of the flaring section is gradually increased from front to back, the minimum diameter of the flaring section is smaller than that of the tube blank, and the maximum diameter of the flaring section is larger than that of the tube blank. The punch with the structure is arranged, when the punch enters the tube blank, the outer diameter of the foremost end of the flaring section is minimum and is smaller than the diameter of the tube blank, so that the frontend of the flaring section can smoothly enter the tube blank, in the entering process, the rear end of the flaring section is connected with the low-pressure sealing section, and the outer diameter of the flaring section is larger than the diameter of the tube blank, so that the tube blank is flared, a sealing cavity is formed between the low-pressure sealing section and the tube blank, and at the moment, a medium-low pressure liquid medium is introduced into the sealing cavity to pre-expand the tube blank; and the punch is continuously pushed, a sealing cavity is formed between the high-pressure sealing section and the tube blank at the moment, and a high-pressure liquid medium is introduced into the sealing cavity to perform high-pressure bulging on the tube blank, so that the tube blank is formed.
Preferably, the surface of the flaring segment is a segment of circular arc transition surface. Through setting the flaring section into the circular arc transition surface, like this, the in-process that the flaring section got into the pipe, the contact of flaring section and pipe internal diameter is line contact to make the flaring section can get into the pipe more smoothly.
In a preferred embodiment of the present invention, the forming surface and the outer surface of the annular body are transitioned by a planar connection, and the planar connection is perpendicular to the axis of the punch. Adopt planar transition mode between the surface of profile and ring body, thereby not only avoided the closed angle transition to avoid stress concentration, prevented that the profile from bursting apart under high-pressure impact, improve the life of drift, planar structure is better processed moreover, has improved machining efficiency.
In a preferred embodiment of the present invention, the molding surface and the outer surface of the annular body are transitioned by a fillet surface connection. Like this, adopt the transition mode of fillet face between the surface of profile and ring body, thereby avoided the closed angle transition to avoid stress concentration, prevent that the profile from bursting apart under highly compressed impact, smooth transition between the surface of profile and ring body simultaneously can bear bigger pressure impact.
In a preferred embodiment of the present invention, an annular accommodating groove for accommodating an end portion of the tube blank is formed between the low-pressure sealing section and the high-pressure sealing section, the annular body is surrounded outside the low-pressure sealing section in correspondence with the annular accommodating groove, and the forming surface is disposed at a front end of the annular body. Set up the annular holding tank of above-mentioned structure, when pressing the pipe shaping to the double cassette card, the tip embedding annular holding tank of pipe supports the bottom of tight annular holding tank, because the profiled surface is located the front end of the ring body, the profiled surface is after the position that reachs annular arc chamber, there is one section distance between the tip of pipe and the annular arc chamber, consequently there is one end distance between the fashioned position of sealed body and the tip of pipe, thereby the shaping that the pipe was pressed to the double cassette card is accomplished
In a preferable scheme of the utility model, the tail part of the punch is provided with a connecting structure for connecting and fixing the punch, the connecting structure comprises a connecting convex ring, and the outer diameter of the connecting convex ring is larger than that of the annular body. The connecting mechanism is arranged, and the connecting convex ring is clamped through the clamping device on the die, so that the fixed installation of the punch can be completed.
In a preferred embodiment of the present invention, the punch is provided with a liquid through hole for passing a liquid medium therein, and the liquid through hole is arranged along an axis of the punch and penetrates through the entire punch. The liquid through holes are arranged, the outer ends of the liquid through holes are connected with the outlet of the pressure generating device, and after the pressure generating device is started, pressure media enter the inner wall of the tube blank through the liquid through holes to form pressure on the tube blank, so that the tube blank is extruded to deform.
A pressure pipe forming device comprises the punch, a rack, a fixed die arranged on the rack, a movable die arranged on the rack, a first power assembly and a second power assembly; the fixed die is provided with a first cavity matched with the outer wall of the clamping pipe, and two sides of the first cavity are opening sides; the movable die is arranged above the fixed die, a second cavity matched with the outer wall of the clamping and pressing pipe is arranged on the movable die, and the second cavity is matched with the first cavity to form a cavity for forming the clamping and pressing pipe; the two punches are arranged in a pair mode, and move oppositely in the cavity in the tube blank forming process, wherein a liquid through hole for introducing a liquid medium into the tube blank is formed in one punch; the first power assembly is used for driving the punch to move in the cavity, the second power assembly is used for providing liquid medium, and the power output end of the second power assembly is communicated with the liquid through hole.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the clamping and pressing pipe forming punch, when a pipe blank is pressed to deform by a high-pressure medium, the non-sharp-angle transition is arranged between the forming surface and the outer surface of the annular body, so that stress concentration is avoided, the forming surface is prevented from cracking, and the service life of the punch is prolonged.
2. According to the clamping and pressing pipe forming punch, the forming surface and the outer surface of the annular body are in non-sharp-angle transition, a gap is formed between the forming surface and the annular arc cavity after the forming surface reaches the position of the annular arc cavity, and in the process that a pipe blank deforms along the annular arc cavity, reaction force is absent in the gap, so that the pipe blank is easier to deform, and the forming efficiency of the pipe blank is improved.
3. According to the pipe clamping and pressing forming punch, the forming surface and the outer surface of the annular body are in non-sharp corner transition, a notch is formed between the forming surface and the annular arc cavity after the forming surface reaches the position of the annular arc cavity, in the process that a pipe blank deforms along the annular arc cavity, the upper part and the lower part of the notch are in line contact with the pipe blank in deformation, and the line contact position generates huge pressure, so that the outer wall of the pipe blank is tightly pressed against the upper part and the lower part of the notch, and when a high-pressure medium reaches the forming surface along a low-pressure sealing section, the pipe blank is tightly pressed against the notch, so that an excellent sealing effect is achieved on the high-pressure medium, and the high-pressure medium is prevented from leaking to the two sides of the mold along the annular body.
Drawings
Fig. 1 to 3 show a first embodiment of a swaging punch according to the present invention, in which fig. 1 is a front sectional view, fig. 2 is a partially enlarged view of a forming surface, and fig. 3 is a perspective view.
Fig. 4 to 5 show a second embodiment of the clinch-pipe forming punch of the present invention, in which fig. 4 is a front sectional view and fig. 5 is a partially enlarged view of a forming surface.
Fig. 6 to 7 show a third embodiment of the clinch-pressing pipe forming punch of the present invention, in which fig. 6 is a front sectional view and fig. 7 is a perspective view.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
Referring to fig. 1-3, the pressure pipe forming punch of the present invention includes a flaring section 1 for entering a pipe blank conveniently, a low pressure sealing section 2 for low pressure pre-expansion of the pipe blank, a high pressure sealing section for high pressure expansion of the pipe blank, and an annular body 3 connected to the high pressure sealing section; the high-pressure sealing section comprises an arc-shaped forming surface 4, the forming surface is positioned at the front end of the annular body 3, and the high-pressure sealing section is characterized in that non-sharp-angle transition is adopted between the forming surface 4 and the outer circular surface of the annular body 3.
Referring to fig. 1-3, the rear end of the flaring segment 1 is connected with the front end of the low-pressure sealing segment 2 along the advancing direction of the punch; the outer diameter of the annular body 3 is larger than that of the low-pressure sealing section 2, the outer diameter of the flaring section 1 is gradually increased from front to back, the minimum diameter of the flaring section 1 is smaller than that of a pipe blank, and the maximum diameter of the flaring section 1 is larger than that of the pipe blank. The punch with the structure is arranged, when the punch enters the tube blank, the outer diameter of the foremost end of the flaring section 1 is minimum and smaller than the diameter of the tube blank, so that the frontend of the flaring section 1 can smoothly enter the tube blank, in the entering process, the rear end of the flaring section 1 is connected with the low-pressure sealing section 2, and the outer diameter of the flaring section is larger than the diameter of the tube blank, so that the tube blank is flared, a sealing cavity is formed between the low-pressure sealing section 2 and the tube blank, and at the moment, a medium-low pressure liquid medium is introduced into the sealing cavity to pre-expand the tube blank; and the punch is continuously pushed, a sealed cavity is formed between the annular body 3 and the tube blank at the moment, and a high-pressure liquid medium is introduced into the sealed cavity to perform high-pressure bulging on the tube blank, so that the tube blank is formed.
Referring to fig. 1-3, the surface of the flaring segment 1 is a circular arc transition surface. Through setting up flaring section 1 to the circular arc transition surface, like this, in the in-process that flaring section 1 got into the pipe, the contact of flaring section 1 and pipe internal diameter is line contact to make flaring section 1 can get into the pipe more smoothly.
Referring to fig. 1-3, the forming surface 4 transitions to the outer surface of the annular body 3 in a planar connection, which is perpendicular to the axis of the punch. Adopt planar transition mode between the surface of profile 4 and ring body 3, thereby not only avoided the closed angle transition to avoid stress concentration, prevented profile 4 and burst under high-pressure impact, improved the life of drift, planar structure is better processed moreover, has improved machining efficiency.
Referring to fig. 1-3, the tail part of the punch is provided with a connecting structure for connecting and fixing the punch, the connecting structure comprises a connecting convex ring 5, and the outer diameter of the connecting convex ring 5 is larger than that of the annular body 3. The connecting mechanism is arranged, and the connecting convex ring 5 is clamped through a clamping device on the die, so that the fixed installation of the punch can be completed.
Referring to fig. 1-3, the punch is internally provided with a liquid through hole 6 for introducing a liquid medium, and the liquid through hole 6 is arranged along the axis of the punch and penetrates through the whole punch. The liquid through holes 6 are arranged, the outer ends of the liquid through holes 6 are connected with the outlet of the pressure generating device, and after the pressure generating device is started, pressure media enter the inner wall of the tube blank through the liquid through holes 6 to form pressure on the tube blank, so that the tube blank is extruded to deform.
Referring to fig. 1 to 3, the working principle of the above-mentioned clamping-pressing pipe forming punch is as follows:
firstly, placing a pipe blank needing to be formed on a fixed die; then the hydraulic mold locking oil cylinder acts to drive the movable mold to move towards the fixed mold, so that the mold locking of the movable mold and the fixed mold is completed; next, the power oil cylinders positioned at two sides of the die act to drive the forming punches at two sides to be inserted into the inner cavity of the tube blank from two ends of the tube blank, the flaring section 1 flares the tube blank, the pressure generating device injects a medium-pressure liquid medium into the inner cavity of the tube blank, the process is continued until the two ends of the tube blank are abutted against the annular body 3, the pressure of the medium-pressure liquid medium plays a role in pre-bulging the tube blank, and a certain gap is generated between the tube blank and the low-pressure sealing section 2; the power oil cylinder continues to act, the two forming punches continue to move in opposite directions, the pressure generating device injects a high-pressure liquid medium into the tube blank, the punches move forward to enable the forming surface 4 to reach the position of an annular arc cavity in the die cavity, at the moment, the forming surface 4 becomes a part of the annular arc cavity, under the pressure action of the high-pressure liquid medium, the inner wall of the tube blank deforms outwards and abuts against the inner wall of the die cavity, and therefore an annular sealing tube body is formed at the position of the annular arc cavity; after the forming surface 4 reaches the position of annular arc chamber in the mould die cavity, when high pressure medium makes the pipe to deform in the annular arc chamber, the forming surface 4 receives the huge pressure that comes from high pressure medium and pipe deformation and bring, because adopt non-closed angle transition between the surface of forming surface 4 and ring body 3, stress concentration has been avoided in non-closed angle transition, even received huge pressure impact, still can avoid the bursting apart of forming surface 4, the life of improvement drift, save manufacturing cost.
A pressure pipe forming device comprises the punch, a rack, a fixed die arranged on the rack, a movable die arranged on the rack, a first power assembly and a second power assembly; the fixed die is provided with a first cavity matched with the outer wall of the clamping pipe, and two sides of the first cavity are opening sides; the movable die is arranged above the fixed die, a second cavity matched with the outer wall of the clamping and pressing pipe is arranged on the movable die, and the second cavity is matched with the first cavity to form a cavity for forming the clamping and pressing pipe; the two punches are arranged in a pair mode, and in the process of forming the tube blank, the two punches move oppositely in the cavity, and a liquid through hole 6 for introducing a liquid medium into the tube blank is formed in one punch; the first power assembly is used for driving the punch to move in the cavity, the second power assembly is used for providing a liquid medium, and the power output end of the second power assembly is communicated with the liquid through hole 6.
Example 2
Referring to fig. 4-5, the present embodiment is different from embodiment 1 in that the forming surface 4 is in transition with the outer surface of the annular body 3 by a fillet surface connection. Like this, adopt the transition mode of fillet face between the surface of profile surface 4 and ring body 3, thereby avoided the closed angle transition to avoid stress concentration, prevent profile surface 4 and collapse and split under highly compressed impact, smooth transition between the surface of profile surface 4 and ring body 3 simultaneously can bear bigger pressure impact.
Example 3
Referring to fig. 6 to 7, the present embodiment is different from embodiment 1 in that an annular accommodation groove 7 for accommodating an end portion of a tube blank is formed between a low pressure seal section 2 and a high pressure seal section, the annular body 3 is surrounded outside the low pressure seal section 2 corresponding to the annular accommodation groove 7, and the forming surface 4 is provided at a front end of the annular body 3. Set up the annular holding tank 7 of above-mentioned structure, when pressing the pipe shaping to the double cassette card, the tip embedding annular holding tank 7 of pipe supports the bottom of tight annular holding tank 7, because profile 4 is located the front end of ring body 3, profile 4 is after the position of reacing annular arc chamber, there is one section distance between the tip of pipe and the annular arc chamber, consequently there is one end distance between the fashioned position of sealed body and the tip of pipe, thereby the shaping of pressing the pipe is pressed to the completion double cassette card.
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (9)
1. A pressure pipe forming punch comprises a flaring section, a low-pressure sealing section, a high-pressure sealing section and an annular body, wherein the flaring section is used for conveniently entering a pipe blank; the high-pressure sealing section comprises an arc-shaped forming surface, and the forming surface is positioned at the front end of the annular body.
2. The crimp tube forming punch according to claim 1, wherein a rear end of the flared section is connected to a front end of the low pressure seal section in a direction of advancement of the punch; the outer diameter of the annular body is larger than that of the low-pressure sealing section, the outer diameter of the flaring section is gradually increased from front to back, the minimum diameter of the flaring section is smaller than that of the tube blank, and the maximum diameter of the flaring section is larger than that of the tube blank.
3. The crimp tube forming punch of claim 2, wherein the surface of the flared section is a radiused transition surface.
4. The crimp forming punch of claim 1, wherein the forming surface transitions into the outer surface of the ring body in a planar connection that is perpendicular to the axis of the punch.
5. The crimp tube forming punch according to claim 1, wherein the forming surface transitions to the outer surface of the ring body in a rounded corner surface connection.
6. The tube clamping and forming punch as claimed in claim 1, wherein an annular accommodating groove for accommodating an end of the tube blank is formed between the low-pressure sealing section and the high-pressure sealing section, the annular body surrounds the low-pressure sealing section corresponding to the annular accommodating groove, and the forming surface is arranged at the front end of the annular body.
7. The tube-clamping forming punch according to claim 1, wherein the tail of the punch is provided with a connecting structure for connecting and fixing the punch, and the connecting structure comprises a connecting convex ring, and the outer diameter of the connecting convex ring is larger than that of the annular body.
8. The press pipe forming punch as claimed in claim 1, wherein the punch is provided with a liquid passing hole for passing a liquid medium therein, and the liquid passing hole is provided along an axis of the punch and extends through the entire punch.
9. A pressure pipe forming device is characterized by comprising the punch head according to any one of claims 1 to 8, a machine frame, a fixed die arranged on the machine frame, a movable die arranged on the machine frame, a first power assembly and a second power assembly; the fixed die is provided with a first cavity matched with the outer wall of the clamping pipe, and two sides of the first cavity are opening sides; the movable die is arranged above the fixed die, a second cavity matched with the outer wall of the clamping and pressing pipe is arranged on the movable die, and the second cavity is matched with the first cavity to form a cavity for forming the clamping and pressing pipe; the two punches are arranged in a pair mode, and move oppositely in the cavity in the tube blank forming process, wherein a liquid through hole for introducing a liquid medium into the tube blank is formed in one punch; the first power assembly is used for driving the punch to move in the cavity, the second power assembly is used for providing liquid medium, and the power output end of the second power assembly is communicated with the liquid through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121708572.7U CN215391878U (en) | 2021-07-26 | 2021-07-26 | Pipe forming punch and pipe forming equipment are pressed to card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121708572.7U CN215391878U (en) | 2021-07-26 | 2021-07-26 | Pipe forming punch and pipe forming equipment are pressed to card |
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| Publication Number | Publication Date |
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| CN215391878U true CN215391878U (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121708572.7U Active CN215391878U (en) | 2021-07-26 | 2021-07-26 | Pipe forming punch and pipe forming equipment are pressed to card |
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| CN (1) | CN215391878U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115255107A (en) * | 2022-07-05 | 2022-11-01 | 保隆(安徽)汽车配件有限公司 | Hydraulic forming sealing head and design method thereof |
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2021
- 2021-07-26 CN CN202121708572.7U patent/CN215391878U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115255107A (en) * | 2022-07-05 | 2022-11-01 | 保隆(安徽)汽车配件有限公司 | Hydraulic forming sealing head and design method thereof |
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