CN215467347U - Anti-cracking double-clamping pipe pressing punch - Google Patents

Abstract

The utility model discloses an anti-cracking double-clamping pressing pipe punch which comprises an expanding section, a low-pressure sealing section and a high-pressure sealing section, wherein the expanding section is used for conveniently entering a pipe blank, the low-pressure sealing section is used for performing low-pressure pre-expansion on the pipe blank, the high-pressure sealing section is used for performing high-pressure expansion on the pipe blank, an annular accommodating groove for accommodating the end part of the pipe blank is formed between the high-pressure sealing section and the low-pressure sealing section, an annular body surrounding the low-pressure sealing section is formed at the position corresponding to the annular accommodating groove, and a forming surface is arranged at the front end of the annular body. The anti-cracking double-clamping-pressure pipe punch disclosed by the utility model can effectively prevent stress concentration in the propelling process, so that cracking of an annular body can be avoided, the service life of the punch is greatly prolonged, and the production cost is reduced.

Description

Anti-cracking double-clamping pipe pressing punch

Technical Field

The utility model relates to internal high-pressure forming equipment, in particular to an anti-cracking double-clamping pressing pipe punch.

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 double-clamping pressure pipe is mainly formed in an internal high-pressure forming mode, the double-clamping pressure pipe comprises a sealing pipe body which is arranged close to the end part, the sealing pipe body is a section of bulge which is outwards protruded along the radial direction, and the sealing pipe body is away from the end part by a certain distance; the cavity of the mould comprises an annular arc cavity for forming a sealing pipe body; the punch comprises a low-pressure sealing section and a high-pressure sealing section, wherein the low-pressure sealing section is used for performing low-pressure pre-expansion on the tube blank, the high-pressure sealing section is used for performing high-pressure expansion on the tube blank, an accommodating groove used for accommodating the end part of the tube blank is arranged between the high-pressure sealing section and the low-pressure sealing section, the punch forms an annular body which is wound outside the low-pressure sealing section at the position corresponding to the high-pressure sealing section, and 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 double-clamp pipe pressing machine 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 pipe pressing machine to be tightly attached to the die cavity to form the pipe pressing machine. However, the above punch has the following problems: the annular body is of an annular closed structure, one end of the annular body is connected to the punch main body to form a cantilever structure, and when a high-pressure medium extrudes the tube blank to be formed outwards, an outwards expanded acting force is formed on the annular body, so that the closed structure of the annular body limits the deformation of the annular body, and the annular body is cracked; on the other hand, the cantilever structure of the annular body is easy to cause the problem of crack under the condition of stress concentration.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide the anti-cracking double-clamping pipe punch which can effectively prevent stress concentration in the propelling process, so that cracking of an annular body can be avoided, the service life of the punch is greatly prolonged, and the production cost is reduced.

The technical scheme for solving the technical problems is as follows:

the utility model provides a prevent bursting apart double cassette card and press a tub drift, is used for conveniently getting into the flaring section in the pipe, is used for carrying out the low pressure seal section that the low pressure expands in advance and is used for carrying out the high-pressure seal section of high-pressure bloated type to the pipe, be formed with the annular holding tank that holds the pipe tip between high-pressure seal section and the low pressure seal section, locate to form the ring shape around outside the low pressure seal section corresponding to annular holding tank, the front end of ring shape is equipped with the profile, its characterized in that, be equipped with axial crack on the ring shape, axial crack extends backward from the front end of ring shape.

The working principle of the anti-cracking double-clamping pressure pipe 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 bottom of the containing groove, 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 inner wall of 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; in the process that the high-pressure liquid medium oppresses the outward deformation of pipe, huge pressure is used for on the ring body, because be equipped with axial crack on the ring body, consequently the ring body can do little deformation relative to axial crack to can avoid the stress concentration of ring body, even received huge pressure impact, still can avoid bursting apart of ring body, improve the life of drift, save manufacturing cost.

In a preferred embodiment of the present invention, the axial slits are provided in plural, and the plural axial slits are provided in a front portion of the annular body, and are uniformly arranged in a circumferential direction of the annular body. Set up a plurality of axial cracks, the annular body divides into a plurality of parts in the circumferencial direction, when receiving pressure impact, can take place micro-deformation each other between a plurality of parts to can avoid stress concentration, prevent that the annular body from taking place to burst.

In a preferred embodiment of the present invention, there are four axial slits. The four axial cracks are arranged, and are uniformly distributed in the circumferential direction of the annular body, so that the two axial cracks which are separated are mutually symmetrical, and when the online cutting machining is carried out, the two axial cracks which are separated can be completed through one-time feed, so that the axial cracks only need to be fed twice, the machining is convenient, and the machining efficiency is high.

In a preferred embodiment of the present invention, the annular body is provided with a through hole, the aperture of the through hole is larger than the width of the axial slit, and the through hole is communicated with the tail end of the axial slit. Therefore, after the front end of the annular body is divided into a plurality of parts by the plurality of axial cracks, both sides of the root of each part are in arc transition, and damage caused by stress concentration can be effectively avoided.

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 inner wall of the tube blank, and the maximum diameter of the flaring section is larger than that of the inner wall 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 inner wall 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 inner wall of the tube blank, so that the tube blank is flared, a sealing cavity is formed between the low-pressure sealing section and the inner wall of 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 inner wall of 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.

According to a preferable scheme of the utility model, the forming surface is an arc-shaped forming surface, and non-sharp-angle transition is adopted between the forming surface and the outer surface of the annular body. Like this, when high pressure medium makes the pipe to deformation in the annular circular arc chamber, the profiled surface receives huge pressure, adopts non-closed angle transition between profiled surface and the ring body surface, and stress concentration has been avoided in non-closed angle transition, even receive huge pressure impact, still can avoid the bursting apart of profiled surface, further improves the life of drift.

Preferably, the forming surface is an arc-shaped forming surface, the forming surface and the outer surface of the annular body are transited in a planar connection mode, and the plane 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 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.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the anti-cracking double-clamping pressing pipe punch, when a high-pressure medium presses a pipe blank to deform, the annular body bears huge pressure, and the annular body is of a non-integral structure, so that stress concentration can be avoided, cracking of the annular body is prevented, and the service life of the punch is prolonged.

2. According to the anti-cracking double-clamping pressure pipe punch, the axial cracks are arranged on the annular body, so that an outward micro-deformation space is provided for the annular body, and the anti-cracking double-clamping pressure pipe punch has a force unloading function and is prevented from cracking when being impacted by high pressure.

Drawings

Fig. 1 is a front cross-sectional view of the anti-crack double-clamping pipe punch of the utility model.

Fig. 2 is a top view of the anti-spalling dual-seize pipe punch of the present invention.

Fig. 3 is a perspective view of the anti-crack double-clamping pipe punch according to the utility model.

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.

Referring to fig. 1-3, a pipe punching head is pressed to anti-bursting double-clamping, including be used for conveniently getting into flaring section 1 in the pipe billet, be used for carrying out the low pressure seal section 2 that expands in advance to the pipe billet and be used for carrying out the high-pressure seal section 10 of high-pressure bulging to the pipe billet, be formed with the annular holding tank 5 that holds the pipe billet tip between high-pressure seal section 10 and the low-pressure seal section 2, form ring body 3 around outside low pressure seal section 2 corresponding to annular holding tank 5 department, the front end of ring body 3 is equipped with profiled surface 4, its characterized in that, be equipped with axial crack 6 on the ring body 3, axial crack 6 extends backward from the front end of ring body 3.

Referring to fig. 1 to 3, the axial slits 6 are provided in plurality, the plurality of axial slits 6 are provided in a front portion of the ring body 3, and the plurality of axial slits 6 are uniformly arranged in a circumferential direction of the ring body 3. Set up a plurality of axial cracks 6, the ring body 3 divides into a plurality of parts on the circumferencial direction, when receiving pressure shock, can take place micro deformation each other between a plurality of parts to can avoid stress concentration, prevent that the ring body 3 from taking place to burst.

With reference to fig. 1-3, there are four of said axial slits 6. Set up four axial cracks 6, because four axial cracks 6 evenly arrange on the circumferencial direction of ring body 3, two axial cracks 6 symmetry each other that consequently are separated from, cut on line and add man-hour, two axis cracks that are separated from can be accomplished through a feed, consequently axial crack 6 only need twice feed, and not only processing is convenient, and machining efficiency is high moreover.

Referring to fig. 1-3, the annular body 3 is provided with a through hole 9, the aperture of the through hole is larger than the width of the axial slit, and the through hole 9 is communicated with the tail end of the axial slit 6. Thus, after the front end of the annular body 3 is divided into a plurality of parts by the plurality of axial slits 6, both sides of the root of each part are in arc transition, so that the damage caused by stress concentration can be effectively avoided.

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 external diameter of ring body 3 is greater than the external diameter of low pressure seal section 2, the external diameter of flaring section 1 is by going to back grow gradually, the minimum diameter of flaring section 1 is less than the diameter of pipe blank inner wall, the maximum diameter of flaring section 1 is greater than the diameter of pipe blank inner wall. The punch with the structure is arranged, when the punch enters a tube blank, the outer diameter of the foremost end of the flaring section 1 is minimum and is smaller than the diameter of the inner wall 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 inner wall 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 inner wall of 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 10 and the inner wall of 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.

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 is an arc-shaped forming surface, and a non-sharp transition is adopted between the forming surface 4 and the outer surface of the annular body 3. Like this, when high pressure medium makes the pipe to deformation in the annular circular arc chamber, profiled surface 4 receives huge pressure, adopts non-closed angle transition between profiled surface 4 and the 3 surfaces of the ring body, and stress concentration has been avoided in the transition of non-closed angle, even receive huge pressure impact, still can avoid the bursting apart of profiled surface 4, further improves the life of drift.

Referring to fig. 1-3, the forming surface 4 is an arc-shaped forming surface, and the forming surface 4 and the outer surface of the annular body 3 are transited in a manner of planar connection, and the plane 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 7, and the outer diameter of the connecting convex ring 7 is larger than that of the annular body 3. The connecting mechanism is arranged, and the connecting convex ring 7 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 8 for introducing a liquid medium, and the liquid through hole 8 is arranged along the axis of the punch and penetrates through the whole punch. The liquid through holes 8 are formed, the outer ends of the liquid through holes 8 are connected with an 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 8 to form pressure on the tube blank, so that the tube blank is extruded to deform.

Referring to fig. 1-3, the working principle of the anti-crack double-clamping pressure pipe 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 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 bottom of the annular accommodating groove 5, 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 inner wall of the tube blank and the low-pressure sealing section 2; 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 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; in the outward deformation in-process of high pressure liquid medium oppression pipe, huge pressure is used for on ring body 3, because be equipped with axial crack 6 on the ring body 3, consequently the ring body 3 can be done little deformation relative to axial crack 6 to can avoid the stress concentration of ring body 3, even received huge pressure impact, still can avoid collapsing of ring body 3 and split, improve the life of drift, save manufacturing cost.

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 (10)

1. The utility model provides a prevent bursting apart double cassette card and press a tub drift, is used for conveniently getting into the flaring section in the pipe, is used for carrying out the low pressure seal section that the low pressure expands in advance and is used for carrying out the high-pressure seal section of high-pressure bloated type to the pipe, be formed with the annular holding tank that holds the pipe tip between high-pressure seal section and the low pressure seal section, locate to form the ring shape around outside the low pressure seal section corresponding to annular holding tank, the front end of ring shape is equipped with the profile, its characterized in that, be equipped with axial crack on the ring shape, axial crack extends backward from the front end of ring shape.

2. The anti-spalling double-clamp pressing pipe punch as in claim 1, wherein the number of the axial cracks is multiple, the multiple axial cracks are arranged at the front part of the annular body, and the multiple axial cracks are uniformly distributed along the circumferential direction of the annular body.

3. The anti-spalling dual collet press ram of claim 2, wherein there are four axial fractures.

4. The anti-spalling double-clamp pressing pipe punch as in claim 1, wherein a through hole is formed in the annular body, the aperture of the through hole is larger than the width of the axial crack, and the through hole is communicated with the tail end of the axial crack.

5. The anti-spalling double-clamp pressing pipe punch as in claim 1, wherein the rear end of the flaring segment is connected with 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 inner wall of the tube blank, and the maximum diameter of the flaring section is larger than that of the closed inner wall.

6. The anti-spalling double-clamp pressing pipe punch as in claim 5, wherein the surface of the flaring segment is a segment of circular arc transition surface.

7. The anti-spalling double-clamp pressing pipe punch as in claim 1, wherein the forming surface is an arc-shaped forming surface, and a non-sharp angle transition is adopted between the forming surface and the outer surface of the annular body.

8. The anti-spalling double-clamp pressing pipe punch as in claim 1, wherein the forming surface is an arc-shaped forming surface, the forming surface and the outer surface of the annular body are transited in a planar connection mode, and the plane is perpendicular to the axis of the punch.

9. The anti-cracking double-clamping pressing pipe punch head as claimed in claim 1, wherein a connecting structure for connecting and fixing the punch head is arranged at the tail of the punch head, 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.

10. The anti-cracking double-clamping pressing pipe punch head as claimed in claim 1, wherein a liquid through hole for introducing a liquid medium is formed in the punch head, is arranged along the axis of the punch head, and penetrates through the whole punch head.

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