CN211839876U

CN211839876U - Round tube expansion die

Info

Publication number: CN211839876U
Application number: CN201922178408.9U
Authority: CN
Inventors: 唐钟海
Original assignee: Zhangjiagang Liwan Precision Parts Co ltd
Current assignee: Zhangjiagang Liwan Precision Parts Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-11-03
Anticipated expiration: 2029-12-09

Abstract

The utility model discloses a pipe expanding die, include: the die comprises a base, wherein a die core is arranged on the base and consists of a plurality of sliding block section dies, an expansion groove is arranged on the inner side wall of each sliding block section die, and a guide inclined plane is arranged at the outer edge of the top end of each sliding block section die; a fixed rod, a polyurethane rubber block and a pressing rod are sequentially stacked in an inner hole of the mold core from bottom to top, a gap is reserved between the fixed rod and the pressing rod and the inner side wall of the mold core formed after splicing, and expansion grooves in the slide block mold are aligned with the polyurethane rubber block; the base is fixedly provided with a circular pressing plate which can abut against the sliding block section mould, a sliding gap is reserved between the sliding block section mould and the pressing plate, a locking plate is arranged above the sliding block section mould, a horn-shaped inner hole is arranged in the locking plate, and the inclined side wall of the horn-shaped inner hole is matched with the guide inclined plane on each sliding block section mould. The die is simple in structure and convenient to operate, the working efficiency is greatly improved, and the quality of the produced product is high.

Description

Round tube expansion die

Technical Field

The utility model relates to a pipe bulging die.

Background

In the production process of round pipes, some structural changes are sometimes required to the round pipe so that the round pipe can adapt to different use environments. In the automotive industry, shock tubes are required, which are structured as shown in fig. 1: the circular tube is provided with an arc-shaped wall protruding outwards. As can be seen from fig. 1, the shock tube is formed by expanding a circular tube, and in order to expand the circular tube into the shock tube having the above-mentioned shape, a special expansion die is required to expand the circular tube.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a work efficiency is high, and the high pipe bulging die section mould of bulging quality.

In order to achieve the above object, the utility model adopts the following technical scheme: a round tube expansion die, comprising: the die comprises a base, wherein a die core is arranged on the base, the die core consists of a plurality of slider section dies with the same size and structure, the slider section dies are in a fan shape, the outer side wall and the inner side wall of each slider section die are concentric arcs, a boss is arranged on the outer side wall of each slider section die, an expansion groove is radially arranged on the inner side wall of each slider section die, a guide inclined plane is arranged on the outer edge of the top end of each slider section die, when all the slider section dies are spliced together, a circular cylindrical die core can be formed, and the expansion grooves on the slider section dies are mutually connected; a fixed rod, a polyurethane rubber block and a pressing rod are sequentially stacked in an inner hole of the mold core from bottom to top, the fixed rod is arranged on the base, the pressing rod and the fixed rod are respectively abutted against the upper end and the lower end of the polyurethane rubber block, the outer diameter of the polyurethane rubber block is not larger than that of the pressing rod, a gap is reserved between the fixed rod and the pressing rod and the inner side wall of the mold core formed after splicing, and expansion grooves in a slide block section mold are aligned with the polyurethane rubber block; the base is fixedly provided with a circular pressing plate, the pressing plate is pressed on the upper end face of the boss of each sliding block section die, a sliding gap is reserved between each sliding block section die and the pressing plate, a locking plate is arranged above each sliding block section die, a horn-shaped inner hole is arranged in the locking plate, and the inclined side wall of each horn-shaped inner hole is matched with the guide inclined plane on each sliding block section die.

Further, the circular tube expansion die comprises a die core and a die core, wherein the die core comprises three slider dies, two side walls of the three slider dies are respectively provided with a spring hole, the spring holes of every two adjacent slider dies are respectively aligned one by one, a rectangular spring is placed in the mutually aligned spring holes, and the slider dies can move outwards and open mutually under the elastic force of the rectangular spring in a free state.

Further, the round tube expansion die, wherein the base includes: positioner and bow-shaped board, positioner fix on the bow-shaped board, positioner includes: mold core bush and locating plate, dead lever closed assembly are on the mold core bush, and slider section mould slides and sets up on the locating plate, and the mold core bush includes: the die core bushing is provided with a first countersunk through hole penetrating through the upper end and the lower end of the die core bushing, the cambered plate is provided with a first threaded hole, the first countersunk through hole is aligned with the first threaded hole, and the hexagon socket head bolt is connected with the first threaded hole after penetrating through the first countersunk through hole; the positioning plate is fixedly connected with the arched plate through bolts, the positioning plate is internally provided with a first cylindrical hole and a second cylindrical hole which are sequentially connected from top to bottom and run through the upper end and the lower end of the positioning plate, the positioning plate is sleeved on the mold core bushing, the first cylindrical hole on the positioning plate is matched with the second cylindrical section on the mold core bushing, the second cylindrical hole on the positioning plate is matched with the third cylindrical section on the mold core bushing, the first cylindrical section in the mold core bushing upwards extends out of the positioning plate and is connected with the fixed rod, and the pressing plate is fixedly connected with the positioning plate.

Further, in the round tube expansion die, a plurality of second countersunk head through holes penetrating through the upper end and the lower end of the pressing plate are formed in the pressing plate, a plurality of second threaded holes are formed in the positioning plate, after the pressing plate is stacked on the positioning plate, the second countersunk head through holes in the pressing plate are respectively aligned with the second threaded holes in the positioning plate one by one, and an inner hexagonal bolt is connected in each aligned second countersunk head through hole and each aligned second threaded hole in a penetrating manner.

Further, the round tube expansion die is characterized in that a connecting piece capable of moving up and down in the inner cavity of the arched plate is arranged in the inner cavity of the arched plate, the connecting piece is connected with the locking plate, and the connecting piece is further connected with an ejector rod in the hydraulic press platform.

Further, in the round tube expansion die, the connecting piece is a die unloading plate, the left side and the right side of the die unloading plate are respectively in threaded connection with a pull rod bolt, and the bottom of the die unloading plate is provided with a plurality of threaded holes capable of being connected with the ejector rods on the hydraulic press platform; the left side and the right side of the locking plate and the left side and the right side of the arched plate are respectively provided with a through hole, two pull rod bolts on the template are respectively upwards passed through the two through holes on the arched plate and then are propped against the bottom of the locking plate, upper thread sections in the two pull rod bolts respectively upwards extend out of the two through holes on the locking plate, and nuts are in threaded connection with the upper thread sections extending out of the locking plate.

Further, the round tube bulging die comprises a fixing rod in an inverted T shape, a first key groove is formed in the vertical portion of the fixing rod, a through hole penetrating through the upper end and the lower end of a polyurethane rubber block is formed in the polyurethane rubber block, the vertical portion of the fixing rod upwards penetrates through the through hole in the polyurethane rubber block and upwards stretches out of the polyurethane rubber block, the bottom of the polyurethane rubber block is abutted against the transverse portion of the fixing rod, the first key groove in the fixing rod upwards stretches out of the polyurethane rubber block, a connecting key is arranged in the first key groove stretching out of the polyurethane rubber block, a connecting hole is formed in the bottom of the pressing rod, a second key groove penetrating through the bottom of the pressing rod is formed in the connecting hole, and when the vertical portion of the fixing rod stretches into the through hole of the pressing rod, the key groove in the pressing rod is connected with the connecting key arranged on the fixing rod.

Further, the round tube expansion die is characterized in that the length of the pressing rod is not shorter than that of the tube to be processed.

The utility model has the advantages that: simple structure, convenient operation have not only improved work efficiency greatly, can not receive the damage at the bulging in-process pipe wall moreover to product quality has been guaranteed.

Drawings

FIG. 1 is a schematic view of a shock tube formed by round tube expansion.

Fig. 2 is a schematic structural diagram of the round tube expansion die of the present invention.

Fig. 3 is a schematic view of the structure of the slider mold of fig. 2.

Fig. 4 is a schematic structural view of three slide blocks in the circular tube expansion die of the present invention opening outwards.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 2, fig. 3 and fig. 4, the round tube expansion die of the present invention comprises: a base, the base comprising: positioner and bow-shaped board 1, positioner are fixed to be set up on bow-shaped board 1, positioner includes: mold core bush 2 and locating plate 3, mold core bush 2 includes: the mold core comprises a first cylindrical section 21, a second cylindrical section 22 and a third cylindrical section 23 which are sequentially connected from top to bottom, the outer diameter of the second cylindrical section 22 is larger than that of the first cylindrical section 21, the outer diameter of the third cylindrical section 23 is larger than that of the second cylindrical section 22, the third cylindrical section 23 is arranged on an arch-shaped plate 1, a first countersunk through hole 24 penetrating through the upper end and the lower end of the mold core bushing 2 is formed in the mold core bushing 2, a first threaded hole 11 is formed in the arch-shaped plate 1, the mold core bushing 2 is arranged on the arch-shaped plate 1, the first countersunk through hole 24 is aligned with the first threaded hole 11, and an inner hexagonal bolt penetrates through the first countersunk through hole 24 and then is in threaded connection with the first threaded hole 11, so that the mold core bushing 2 is fixed on the arch-shaped plate 1. The positioning plate 3 is fixed on the bow-shaped plate 1 through bolted connection, it is consecutive from top to bottom to be provided with in the positioning plate 3, and run through first cylinder hole and the second cylinder hole of the last lower extreme of positioning plate 3, the positioning plate cover 3 is established on mold core bush 2, first cylinder hole on the positioning plate 3 cooperatees with second cylinder section 22 on the mold core bush 2, second cylinder hole on the positioning plate 3 cooperatees with third cylinder section 23 on the mold core bush 2, just so can further fix the positioning plate 3 on the bow-shaped plate 1, first cylinder section 21 on the mold core bush 2 upwards stretches out in positioning plate 3. The positioning plate 3 is provided with a circular mold core, the mold core is formed by splicing three sliding block section molds 4 which are arranged on the positioning plate 3 in a sliding mode, the sliding block section molds 4 are in a fan shape, the outer side wall and the inner side wall of each sliding block section mold 4 are concentric arcs, the outer side wall of each sliding block section mold 4 is provided with a boss 41, the inner side wall of each sliding block section mold 4 is radially provided with an expansion type groove 42, the outer edge of the top end of each sliding block section mold 4 is provided with a guide inclined plane, two side walls of each sliding block section mold 4 are provided with a spring hole 43, the spring holes 43 on each two adjacent sliding block section molds 4 are respectively aligned one by one, a rectangular spring 44 is arranged in the spring holes 43 which are aligned with each other, and under a free state, the elastic force of the rectangular spring 44 can enable each sliding block section mold 4. When the three slider moulds 4 overcome the elasticity of the rectangular spring 44, the three slider moulds are spliced together to form the circular cylindrical mould core, and the expansion grooves 42 on the three slider moulds 4 are mutually connected. Fixedly connected with ring shape clamp plate 5 on locating plate 3, the connection structure between locating plate 3 and clamp plate 5 is: the pressing plate 5 is provided with a plurality of second countersunk through holes penetrating through the upper end and the lower end of the pressing plate 5, the positioning plate 3 is provided with a plurality of second threaded holes, the pressing plate 5 is stacked on the positioning plate 3, the second countersunk through holes on the pressing plate 5 are respectively aligned with the second threaded holes on the positioning plate 3 one by one, and an inner hexagon bolt is connected in each of the aligned countersunk through holes and the threaded holes in a penetrating manner. The pressing plate 5 presses against the upper end surfaces of the bosses 41 of the three slider molds 4, and sliding gaps are reserved between the three slider molds 4 and the pressing plate 5. From down up the closed assembly in proper order has dead lever 6, polyurethane rubber piece 7 and pressure stick 8 in the hole of mold core, the length of pressing stick 8 can not be shorter than the length of waiting to process the pipe fitting. The fixing rod 6 is in an inverted T shape, a transverse part on the fixing rod 6 is connected with a first cylindrical section 21 in the mold core bushing 2, the outer diameter of the transverse part on the fixing rod 6 is the same as that of the first cylindrical section 21, a first key groove 61 is arranged on a vertical part of the fixing rod 6, a through hole penetrating through the upper end and the lower end of the polyurethane rubber block 7 is arranged in the polyurethane rubber block 7, the vertical part of the fixing rod 6 upwards penetrates through the through hole in the polyurethane rubber block 7 and upwards extends out of the polyurethane rubber block 7, the first key groove on the fixing rod 6 upwards extends out of the polyurethane rubber block 7, a connecting key is arranged in the first key groove 61, a connecting hole 81 is arranged at the bottom of the pressing rod 8, a second key groove penetrating through the bottom of the pressing rod 8 is arranged on the inner side wall of the connecting hole 81, when the vertical part of the fixing rod 6 extends into the connecting hole 81 of the pressing rod 8, the second key groove on the pressing rod 8 is connected with the connecting, the pressing rod 8 is connected with the fixing rod 6, the pressing rod 8 and the fixing rod 6 are respectively abutted against the upper end and the lower end of the polyurethane rubber block 7, the outer diameter of the polyurethane rubber block 7 is the same as the outer diameter of the transverse portion of the fixing rod 6 and the outer diameter of the pressing rod 8, a gap is reserved between the pressing rod 8 and the inner side wall of the mold core formed by splicing, and the expansion grooves 42 in the three slider molds 4 are all aligned with the polyurethane rubber block 7.

The locking plate 9 is arranged above the mold core, the trumpet-shaped inner hole 91 is arranged on the locking plate 9, the inclined side wall of the trumpet-shaped inner hole 91 is matched with the guide inclined planes on the three slide block section molds 4, the connecting piece capable of moving up and down in the inner cavity of the segmental plate 1 is arranged in the inner cavity of the segmental plate 1, the connecting piece is connected with the locking plate 9, and the connecting piece is also connected with the ejector rod in the hydraulic press platform. The connecting piece is an unloading template 10, the left side and the right side of the unloading template 10 are respectively in threaded connection with a stay bolt 101, and the bottom of the unloading template 10 is provided with a plurality of threaded holes capable of being connected with an ejector rod on a hydraulic press platform; the left side and the right side of the locking plate 9 and the bow-shaped plate 1 are respectively provided with a through hole, two pull rod bolts 101 on the unloading plate 10 respectively penetrate through the two through holes on the bow-shaped plate 1 upwards and then abut against the bottom of the locking plate 9, upper thread sections of the two pull rod bolts 101 respectively extend upwards out of the two through holes on the locking plate 9, and nuts 102 are connected to the upper thread sections extending out of the locking plate 9 in a threaded mode. Thus, the ejector rod on the hydraulic press can drive the locking plate 9 to move up and down by driving the stripper plate 10. In the process that the locking plate 9 moves downwards, the inclined side wall of the trumpet-shaped inner hole 91 is matched with the guide inclined planes on the sliding block section moulds 4, and in the process that the locking plate 9 moves downwards, after the inclined side wall of the trumpet-shaped inner hole 91 on the locking plate 9 is contacted with the guide inclined planes, the locking plate 9 can drive the three sliding block section moulds 4 to simultaneously move inwards by overcoming the elasticity of the rectangular spring 44 until the three sliding block section moulds 4 are spliced together to form the mould core. During the upward movement of the locking plate 9, the inclined side walls of the flared inner hole 91 are separated from the guide inclined surfaces, and the three slider molds 4 are opened outward by the elastic force of the rectangular spring 44.

The working process of the utility model is as follows: the cambered plate 1 is placed on a platform of a hydraulic press, and the stripper plate 10 is connected with an ejector rod on the hydraulic press. The pipe fitting to be processed is sleeved on the pressing rod 8, the lower end of the pipe fitting to be processed abuts against the end face of the second cylindrical section 22 in the mold core bushing 2, then the ejector rod is driven to pull the unloading plate 10 downwards, the unloading plate 10 drives the locking plate 9 to move downwards through the pull rod bolt 101, after the inclined side wall of the trumpet-shaped inner hole 91 in the locking plate 9 is contacted with each guide inclined plane, each slide block section mold 4 overcomes the elasticity of the rectangular spring 44 and then moves inwards until the circular cylindrical mold core is formed by splicing. Then drive the hydraulic ram head on the hydraulic press, hydraulic ram head down punching press is pressed stick 8, and the stick 8 exerts decurrent extrusion force to polyurethane rubber piece 7, and soft and have elastic polyurethane rubber piece 7 and will expand to all around after receiving pressure, make the pipe wall of pipe receive huge extrusion force, the pipe wall of pipe will laminate with the bloated type groove 42 on the mold core each other gradually after receiving the extrusion force, until the pipe wall bloated type of pipe forms the shape the same with bloated type groove 42. After the expansion is completed, the ejector rod is driven to push the unloading plate 10 upwards, the unloading plate 10 drives the locking plate 9 to move upwards through the pull rod bolt 101, the locking plate 9 leaves the sliding block section moulds 4 upwards, the extrusion force applied to the sliding block section moulds 4 is gradually reduced, and the sliding block section moulds 4 are opened outwards under the action of the elastic force of the rectangular spring 44, so that the circular tube after the expansion is completed can be taken down.

Claims

1. A round tube expansion die, comprising: base, its characterized in that: the base is provided with a mold core, the mold core consists of a plurality of slide block section molds with the same size and structure, the slide block section molds are in a fan shape, the outer side wall and the inner side wall of each slide block section mold are concentric arcs, the outer side wall of each slide block section mold is provided with a boss, the inner side wall of each slide block section mold is radially provided with an expansion groove, the outer edge of the top end of each slide block section mold is provided with a guide inclined plane, when all the slide block section molds are spliced together, a circular cylindrical mold core can be formed, and the expansion grooves on the slide block section molds are mutually connected; a fixed rod, a polyurethane rubber block and a pressing rod are sequentially stacked in an inner hole of the mold core from bottom to top, the fixed rod is arranged on the base, the pressing rod and the fixed rod are respectively abutted against the upper end and the lower end of the polyurethane rubber block, the outer diameter of the polyurethane rubber block is not larger than that of the pressing rod, a gap is reserved between the fixed rod and the pressing rod and the inner side wall of the mold core formed after splicing, and expansion grooves in a slide block section mold are aligned with the polyurethane rubber block; the base is fixedly provided with a circular pressing plate, the pressing plate is pressed on the upper end face of the boss of each sliding block section die, a sliding gap is reserved between each sliding block section die and the pressing plate, a locking plate is arranged above each sliding block section die, a horn-shaped inner hole is arranged in the locking plate, and the inclined side wall of each horn-shaped inner hole is matched with the guide inclined plane on each sliding block section die.

2. A round tube expansion die as claimed in claim 1 or in which: the mold core is composed of three slide block section molds, two side walls of the three slide block section molds are respectively provided with a spring hole, the spring holes on every two adjacent slide block section molds are respectively aligned one by one, a rectangular spring is placed in the mutually aligned spring holes, and the elastic force of the rectangular spring enables the slide block section molds to move outwards and open mutually in a free state.

3. A round tube expansion die as claimed in claim 1 or 2, wherein: the base includes: positioner and bow-shaped board, positioner fix on the bow-shaped board, positioner includes: mold core bush and locating plate, dead lever closed assembly are on the mold core bush, and slider section mould slides and sets up on the locating plate, and the mold core bush includes: the die core bushing is provided with a first countersunk through hole penetrating through the upper end and the lower end of the die core bushing, the cambered plate is provided with a first threaded hole, the first countersunk through hole is aligned with the first threaded hole, and the hexagon socket head bolt is connected with the first threaded hole after penetrating through the first countersunk through hole; the positioning plate is fixedly connected with the arched plate through bolts, the positioning plate is internally provided with a first cylindrical hole and a second cylindrical hole which are sequentially connected from top to bottom and run through the upper end and the lower end of the positioning plate, the positioning plate is sleeved on the mold core bushing, the first cylindrical hole on the positioning plate is matched with the second cylindrical section on the mold core bushing, the second cylindrical hole on the positioning plate is matched with the third cylindrical section on the mold core bushing, the first cylindrical section in the mold core bushing upwards extends out of the positioning plate and is connected with the fixed rod, and the pressing plate is fixedly connected with the positioning plate.

4. A round tube expansion die as claimed in claim 3, wherein: the pressing plate is provided with a plurality of second countersunk through holes penetrating through the upper end and the lower end of the pressing plate, the positioning plate is provided with a plurality of second threaded holes, the pressing plate is stacked on the positioning plate, the second countersunk through holes on the pressing plate are respectively aligned with the second threaded holes on the positioning plate one by one, and an inner hexagonal bolt is connected in each aligned second countersunk through hole and each second threaded hole in a penetrating manner.

5. A round tube expansion die as claimed in claim 3, wherein: the connecting piece is arranged in the inner cavity of the cambered plate and can move up and down in the inner cavity of the cambered plate, the connecting piece is connected with the locking plate, and the connecting piece is also connected with the ejector rod in the hydraulic press platform.

6. The round tube expansion die of claim 5, wherein: the connecting piece is a stripping plate, the left side and the right side of the stripping plate are respectively in threaded connection with a pull rod bolt, and the bottom of the stripping plate is provided with a plurality of threaded holes capable of being connected with an ejector rod on a hydraulic press platform; the left side and the right side of the locking plate and the left side and the right side of the arched plate are respectively provided with a through hole, two pull rod bolts on the template are respectively upwards passed through the two through holes on the arched plate and then are propped against the bottom of the locking plate, upper thread sections in the two pull rod bolts respectively upwards extend out of the two through holes on the locking plate, and nuts are in threaded connection with the upper thread sections extending out of the locking plate.

7. A round tube expansion die as claimed in claim 1 or 2, wherein: the dead lever is the type of falling T shape, be provided with first keyway in the vertical portion of dead lever, be provided with the through-hole that runs through polyurethane rubber piece upper and lower extreme in polyurethane rubber piece, the vertical portion of dead lever upwards passes the through-hole in the polyurethane rubber piece, and upwards stretch out in polyurethane rubber piece, polyurethane rubber piece's bottom is supported and is leaned on the horizontal portion of dead lever, first keyway on the dead lever upwards stretches out in polyurethane rubber piece, be provided with the connection key in stretching out polyurethane rubber piece's first keyway, bottom at the pressure bar is provided with the connecting hole, be provided with the second keyway that runs through the pressure bar bottom in the connecting hole, when the vertical portion of dead lever stretches into in the through-hole of pressure bar, keyway on the pressure bar links to each other with the connection key that sets up on the dead lever.

8. A round tube expansion die as claimed in claim 1 or 2, wherein: the length of the pressing rod is not shorter than that of the pipe fitting to be processed.