CN112058930A - A terrace die and supporting production facility structure for drawing eccentric blank pipe - Google Patents
A terrace die and supporting production facility structure for drawing eccentric blank pipe Download PDFInfo
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- CN112058930A CN112058930A CN202010830941.3A CN202010830941A CN112058930A CN 112058930 A CN112058930 A CN 112058930A CN 202010830941 A CN202010830941 A CN 202010830941A CN 112058930 A CN112058930 A CN 112058930A
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- male die
- blank pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
- B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/16—Mandrels; Mounting or adjusting same
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention discloses a male die for drawing an eccentric blank pipe and a matched production equipment structure. The die comprises a die assembly, a die drawing assembly, a male die rod, an inner wall supporting self-adaptive structure and a bottom plate; the front and the back of the upper surface of the bottom plate are provided with a die pressing assembly and a die drawing assembly, a male die rod is fixed, the outer side surface of the male die rod is provided with a flange, the male die rods positioned at the front part and the back part of the flange are respectively used as a first male die rod and a second male die rod, the first male die rod extends into the back end of a through hole I of the die assembly, the second male die rod extends into a through hole II of the die drawing assembly, and the first male die rod is sleeved with a male die through a; the inner wall supporting self-adaptive structure is arranged inside the second male die rod, so that the inner wall of the pipe is supported in different degrees, and the requirement on the shape error precision of different positions of the inner wall is met. The invention has simple structure, realizes the drawing production of the eccentric blank pipe by using a male die and can improve partial defect characteristics in the forming of the bent pipe.
Description
Technical Field
The invention belongs to the technical field of improving the distortion of the bending section and the wall thickness change of a circular pipe fitting, and particularly relates to a male die for drawing an eccentric blank pipe and a matched production equipment structure.
Background
At present, the pipe bending technology is widely applied to various industries such as the automobile industry, the three-dimensional aviation manufacturing industry and the like, and the improvement of the pipe bending technology plays a vital role in improving the quality of products in the industries. The application of the bent pipe is limited due to the defects of the bent pipe technology, such as the change of the wall thickness of the pipe, the distortion of the section and the like. At present, in the process of producing the bent pipe, the method adopted aiming at the defects of the bent pipe such as wall thickness variation, cross section distortion and the like mainly comprises the steps of adjusting process parameters, filling by using a core rod and the like. The process parameters are more in variety, the coupling relationship between the process parameters is more complex, and proper parameter configuration is difficult to master. The defects of the bent pipe can be effectively relieved by filling the core rod, but the production efficiency is difficult to improve because the position of the core rod needs to be adjusted by consuming extra working hours for producing each bent pipe.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a production equipment structure of an eccentric blank pipe, which can improve the bending forming quality of a round pipe fitting and improve the production efficiency of a bent pipe.
The technical scheme adopted by the invention is as follows:
a male die used for drawing an eccentric blank pipe and a matched production equipment structure comprise a die assembly, a male die rod, an inner wall supporting self-adaptive structure and a bottom plate; the upper surface of the bottom plate is provided with a die pressing assembly and a die drawing assembly in the front and back, a through hole I which penetrates through the die pressing assembly in the front and back is formed in the middle of the die pressing assembly, the through hole I is of a horn-shaped structure with a large front end inner diameter and a small rear end inner diameter, a through hole II which penetrates through the die drawing assembly in the front and back and is coaxially arranged with the through hole I is formed in the middle of the die drawing assembly, and the inner;
the male die rods are arranged in the through holes I and II in a hanging mode, flanges are arranged on the outer side faces of the male die rods, the male die rods located in the front portion and the rear portion of the flanges are respectively used as a first male die rod and a second male die rod, the first male die rod extends into the rear end of the through hole I of the die assembly, the second male die rod extends into the through hole II of the die assembly, the first male die rod is sleeved with a male die through a flat key, and axial limiting of the male die is achieved through the flanges on the male die rods;
the protruding membrane pole of second is inside hollow structure, the inner wall supports adaptive structure and installs inside the protruding membrane pole of second, the inner wall supports adaptive structure and includes the pivot, the commentaries on classics axle ring, the connecting rod, bracing piece and top mould, equidistant suit is fixed with a plurality of commentaries on classics axle rings in the pivot, the protruding membrane pole of second is the radial hole that the circumference equipartition has a plurality of inside and outside to run through in the position department that every commentaries on classics axle ring corresponds, every commentaries on classics axle ring is equally spaced along circumference and is opened has a plurality of arc walls, every arc wall links to each other with connecting rod one end through articulated, the connecting rod other end links to each other with bracing piece one end through articulated, the bracing piece other end has the top mould.
The die assembly is formed by vertically butting an upper die and a lower die through a plurality of guide rods, the lower die is fixed on the bottom plate, and the upper die can slide vertically along the guide rods; the drawing die assembly is formed by vertically butting an upper drawing die and a lower drawing die.
The bottom of the die assembly is fixed on the upper surface of the base plate, and the bottom of the die assembly is slidably mounted in a guide groove formed in the upper surface of the base plate.
The convex die rod is clamped and fixed through the clamping device, the convex die rod is coaxially arranged with the through hole I and the through hole II, the inner circle of the convex die is concentric with the outer circle of the convex die rod, the diameters of two circles are equal, the convex die is an eccentric ring, and the distance between the circle center of the outer circle of the convex die and the circle center of the inner circle of the convex die is the eccentric amount of the eccentric blank pipe. And the symmetry plane of the male die is vertical to the bottom plate.
The rotating shaft rotates forwards, meanwhile, the rotating shaft collar is driven to rotate forwards, the connecting rod moves along with the rotating shaft collar under the pushing of the arc-shaped groove, so that the top dies are pushed by the supporting rod to move axially along the radial holes of the male die rods until all the top dies abut against the inner wall of the blank pipe, and the inner wall supporting self-adaptive structure is in an unfolded state;
when the top die closest to the inner wall of the blank pipe is contacted with the inner wall of the blank pipe, the rotating shaft is limited to rotate, and the other ends of the connecting rods connected with the other top dies push the other top dies to abut against the inner wall of the blank pipe, so that the self-adaptive support of the inner wall support self-adaptive structure is completed;
the rotating shaft rotates reversely, meanwhile, the rotating shaft ring rotates reversely, the connecting rod moves along with the rotating shaft ring under the pushing of the arc-shaped groove, so that the supporting rod drives the top die to be separated from the inner wall of the blank pipe, and the inner wall supporting self-adaptive structure is in a tightening state.
The two sides of the first male die rod are fixedly connected with the male dies through flat keys, and flat key grooves which correspond in position and are used for embedding the flat keys are formed in the outer side face of the first male die rod and the inner side face of the male dies.
The rotating shaft and the male die rod are coaxially arranged, one end of the rotating shaft is fixedly connected with a center hole of the second male die rod, and the other end of the rotating shaft is connected with an external motor to realize rotation of the rotating shaft. The male die is positioned between the male die rod and the through hole I, and the outer diameter of the through hole I is slightly larger than that of the male die.
The supporting rod is a blind threaded hole; the top die is a through threaded hole, and the contact surface of the top die and the eccentric blank pipe is one end of the through threaded hole, which is far away from the supporting rod.
Working method adopting male die for drawing eccentric blank pipe and matched production equipment structure
In an initial state, the blank pipe extends into the through hole I from the front end of the die assembly and then is sleeved outside the male die, the upper die is butted with the lower die through the guide rod to extrude the blank pipe from top to bottom, the front end face of the die assembly is attached to the rear end face of the die assembly, and the inner wall supporting self-adaptive structure is in a tightened state;
continuously pushing the blank pipe, extruding the pipe fitting area of the blank pipe, which is contacted with the male die, from the non-eccentric blank pipe into an eccentric blank pipe, extending the blank pipe into the through hole II until one end of the blank pipe, which is close to the drawing die assembly, moves to the rear end of the through hole II, and stopping pushing the blank pipe;
the rotating shaft rotates and simultaneously drives all the top dies to move towards the direction far away from the rotating shaft through the connecting rod, so that the end parts of the top dies abut against different areas of the inner wall of the blank pipe to ensure the cylindricity of the inner surface and the outer surface of the blank pipe; and the die drawing assembly clamps the blank pipe and moves towards one side far away from the die pressing assembly until the whole blank pipe penetrates out of the through hole I, so that the eccentric blank pipe is drawn.
The invention has the beneficial effects that:
the eccentric structure of the outer circle and the inner circle of the male die is simple, the eccentric amount of the inner hole in the drawing process of the pipe is changed through the eccentric structure of the outer circle and the inner circle of the male die, and the machining error is reduced; the inner wall of the pipe is supported by the inner wall support self-adaptive structure to different degrees, and the requirement on the shape error precision of different positions of the inner wall is met.
Drawings
FIG. 1 is an isometric view of an eccentric blank tube drawing production apparatus of the present invention;
FIG. 2 is a front view of the male die and accessory parts of the present invention;
FIG. 3 is a cross-sectional view of the male die and attachment of the present invention;
FIGS. 4a and 4b are a minimum state diagram and a maximum state diagram of the inner wall support adaptive structure of the present invention, respectively;
FIGS. 5a and 5b are sectional views of the eccentric blank tube drawing production apparatus of the present invention at the beginning and end of one movement cycle;
FIG. 6 is a block diagram of a male mold bar according to the present invention;
fig. 7 is a structural view of the inner wall support adaptive structure of the present invention.
In the figure: 1. the device comprises a bottom plate, 2, a lower die, 3, an upper die, 4, a guide rod, 5, a male die, 6, a flat key, 7, a male die rod, 8, a rotating shaft, 9, a rotating shaft ring, 10, a connecting rod, 11, a supporting rod, 12, a top die, 13, an upper drawing die, 14 and a lower drawing die.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1, the invention mainly comprises a die assembly, a punch 5, a punch rod 7 and an inner wall support adaptive structure. Pressing die assembly and drawing die assembly are arranged around 1 upper surface of bottom plate, and the middle through-hole I that runs through around being provided with of pressing die assembly, through-hole I are the big loudspeaker column structure that the rear end internal diameter is little of front end internal diameter, are provided with the through-hole II that runs through around with I coaxial arrangement of through-hole in the middle of the drawing die assembly, and II internal diameters of through-hole are the same with I rear end internal diameter of through-hole. The die assembly is formed by up-down butt joint of an upper die 3 and a lower die 2 through a plurality of guide rods 4, the lower die 2 is fixed on the fixing bottom plate 1, and the upper die 3 can be connected with or separated from the lower die 2 through the four guide rods 4. The drawing die assembly is formed by vertically butting an upper drawing die 13 and a lower drawing die 14; after the eccentric section of the blank straight pipe passing through the convex die 5 is locked, the upper drawing die 13 and the lower drawing die 14 can continue to draw the non-eccentric section of the blank straight pipe.
As shown in fig. 2 and 3, the male die structure comprises a male die 5, a male die rod 7 and two flat keys 6 for connection; the inner diameter and the key groove of the male die 5 are matched with the outer diameter and the key groove of the male die rod 7, so that the radial limit of the male die is realized; the inner circle and the outer circle of the male die 5 are not concentric, and the distance between the centers of the inner circle and the outer circle of the male die 5 is determined according to the eccentricity of the eccentric blank pipe; the flange arranged on the outer side surface of the male die rod 7 provides axial limiting for the male die 5, and because the friction force borne by the male die 5 is one-way and is the same as the moving direction of the drawing die 13 during working, the axial limiting is not required to be carried out on the male die 5 in the other direction.
As shown in fig. 6, the outer side surface of the male die rod 7 is provided with a flange, and the male die rods 7 positioned at the front part and the rear part of the flange are respectively used as a first male die rod and a second male die rod; the first male die rod is sleeved with a male die 5 through a flat key 6, and the axial limiting of the male die 5 is realized through a flange on the male die rod 7; the second male die rod is of an internal hollow structure, the inner wall supporting self-adaptive structure is arranged in the second male die rod,
as shown in fig. 7, inner wall supports adaptive structure includes pivot 8, pivot ring 9, connecting rod 10, bracing piece 11 and top mould 12, be fixed with a plurality of pivot rings 9 through jackscrew equidistant suit in the pivot 8, the protruding mould pole of second is the top mould hole that the circumference equipartition has a plurality of inside and outside to run through in the position department that every pivot ring 9 corresponds, every pivot ring 9 has a plurality of arcwalls along circumference equidistant opening, every arcwall links to each other with connecting rod 10 one end through articulated, the connecting rod 10 other end links to each other with bracing piece 11 one end through articulated, the bracing piece 11 other end has top mould 12 through threaded connection, top mould 12 tip stretches out from the second terrace die pole outer wall through top mould hole.
As shown in fig. 4a and 4b, the rotating shaft 8, the rotating shaft ring 9 and the through hole i are concentric; the distance between the circle center of the rotating shaft 8 and the circle center of the inner wall of the blank pipe is an eccentric amount, and the supporting die is required to support different positions of the inner wall in a self-adaptive mode; the rotary shaft ring 9 is provided with four arc grooves which are not communicated with each other and are spaced at equal intervals, and one end of the connecting rod 10 can move in the arc grooves to drive the other end of the connecting rod 10 to move; one end of a connecting rod 10 is connected with one end of a supporting rod 11, the other end of the supporting rod 11 is in threaded connection and matching with a top die 12, and the top die 12 is limited in the radial direction of a radial hole of the male die rod 7 and can only move in the axial direction of the radial hole of the male die rod 7; when the rotating shaft 8 rotates clockwise, the four arc-shaped grooves drive the four connecting rods 10 to move, the connecting rods 10 pull the supporting rod 11 to move toward the axis of the rotating shaft 8, and the supporting rod 11 drives the top die 12 to separate from the inner wall of the blank pipe, as shown in fig. 4 a. When the rotating shaft 8 rotates anticlockwise, the four annular grooves drive the four connecting rods 10 to move reversely, the connecting rods 10 pull the supporting rods 11 to deviate towards the axis of the rotating shaft 8, and the supporting rods 11 drive the top die 12 to be in contact with the inner wall of the blank pipe, so that the effect of supporting the inner wall is achieved; since the blank pipe is an eccentric blank pipe, the distance that the top die 12 needs to move will be different to realize the function of inner wall support self-adaptation, as shown in fig. 4 b.
The specific embodiment is as follows:
as shown in fig. 5a, when the non-eccentric blank pipe extends into the through hole i from the tail end and then is sleeved outside the male die 5, the upper die 3 is connected with the lower die 2 through the guide rod to extrude the non-eccentric blank pipe, and the metal material flows; the non-eccentric blank pipe is continuously pushed towards the direction of the convex mould 5, so that the contact area of the blank pipe and the convex mould 5 can be changed into an eccentric pipe.
As shown in fig. 5b, when the end of the blank pipe close to the drawing die assembly moves to the rear end of the through hole ii (so that the drawing die 13 can be fully contacted with the outer wall of the blank pipe), the drawing die assembly clamps the blank pipe to move continuously, the rotating shaft 8 rotates and drives the inner wall support adaptive structure to be attached to different areas of the inner wall of the eccentric blank pipe, and the inner and outer cylindricities of the eccentric blank pipe are ensured.
Claims (8)
1. A male die and a matched production equipment structure for drawing an eccentric blank pipe are characterized by comprising a die assembly, a drawing die assembly, a male die (5), a male die rod (7), an inner wall supporting self-adaptive structure and a bottom plate (1);
the upper surface of the bottom plate (1) is provided with a die pressing assembly and a die drawing assembly in front and back, a through hole I which penetrates through the die pressing assembly in front and back is formed in the middle of the die pressing assembly, the through hole I is of a horn-shaped structure with a large front end inner diameter and a small back end inner diameter, a through hole II which penetrates through the die drawing assembly in front and back and is coaxially arranged with the through hole I is formed in the middle of the die drawing assembly, and the inner diameter of the through;
the male die rods (7) are arranged in the through holes I and II in a hanging mode, flanges are arranged on the outer side faces of the male die rods (7), the male die rods (7) located at the front portion and the rear portion of the flanges are respectively used as a first male die rod and a second male die rod, the first male die rod extends into the rear end of the through hole I of the die assembly, the second male die rod extends into the through hole II of the die assembly, the first male die rod is sleeved with a male die (5) through a flat key (6), and axial limiting of the male die (5) is achieved through the flanges on the male die rods (7);
the second terrace die pole is inside hollow structure, inner wall supports adaptive structure and installs inside second terrace die pole, inner wall supports adaptive structure and includes pivot (8), pivot ring (9), connecting rod (10), bracing piece (11) and top mould (12), equidistant suit is fixed with a plurality of pivot rings (9) on pivot (8), the second terrace die pole is the radial hole that the circumference equipartition had a plurality of inside and outside penetrations in the position department that every pivot ring (9) corresponds, every pivot ring (9) are opened along circumference equidistant has a plurality of arcs, every arc links to each other through articulated and connecting rod (10) one end, the connecting rod (10) other end links to each other through articulated and bracing piece (11) one end, bracing piece (11) other end has top mould (12) through threaded connection, top mould (12) tip stretches out through radial from second terrace die pole outer wall.
2. The male die and the matched production equipment structure for drawing the eccentric blank pipe according to the claim 1 is characterized in that the die assembly is composed of an upper die (3) and a lower die (2) which are butted up and down through a plurality of guide rods (4), and the lower die (2) is fixed on the bottom plate (1);
the drawing die assembly is formed by vertically butting an upper drawing die (13) and a lower drawing die (14).
3. The male die and associated production equipment structure for drawing eccentric blank pipe according to claim 1 is characterized in that the bottom of the die assembly is fixed on the upper surface of the bottom plate (1), and the bottom of the die assembly is slidably mounted in a guide groove formed on the upper surface of the bottom plate (1).
4. The male die and the matched production equipment structure for drawing the eccentric blank pipe according to claim 1 are characterized in that the male die rod is clamped and fixed through a clamping device, the male die rod (7) is coaxially arranged with the through hole I and the through hole II, the inner circle of the male die (5) is concentric with the outer circle of the male die rod (7), the diameters of the two circles are equal, the male die (5) is an eccentric ring, and the distance between the circle center of the outer circle of the male die (5) and the circle center of the inner circle is the eccentric amount of the eccentric blank pipe.
5. The male die and associated production equipment structure for drawing eccentric blank pipe according to claim 1,
the rotating shaft (8) rotates forwards, meanwhile, the rotating shaft ring (9) is driven to rotate forwards, the connecting rod (10) moves along with the rotating shaft ring (9) under the pushing of the arc-shaped groove, so that the top molds (12) are pushed by the supporting rod to move axially along the radial holes of the convex mold rods (7) until all the top molds (12) abut against the inner wall of the blank pipe, and the inner wall supporting self-adaptive structure is in an expanded state;
the rotating shaft (8) rotates reversely, meanwhile, the rotating shaft ring (9) rotates reversely, the connecting rod (10) moves along with the rotating shaft ring (9) under the pushing of the arc-shaped groove, so that the top die (12) is driven by the supporting rod to be separated from the inner wall of the blank pipe, and the inner wall supporting self-adaptive structure is in a tightening state.
6. The male die and the matched production equipment structure for drawing the eccentric blank pipe according to the claim 1 are characterized in that two sides of the first male die rod are fixedly connected with the male die through flat keys, and the outer side surface of the first male die rod and the inner side surface of the male die (5) are respectively provided with flat key grooves which correspond to each other in position and are used for embedding the flat keys.
7. The male die and matched production equipment structure for drawing the eccentric blank pipe according to claim 1 is characterized in that a rotating shaft (8) and a male die rod (7) are coaxially arranged, one end of the rotating shaft (8) is fixedly connected with a central hole of a second male die rod, and the other end of the rotating shaft (8) is connected with an external motor to realize the rotation of the rotating shaft (8).
8. The working method of the male die for drawing the eccentric blank pipe and the matched production equipment structure according to any one of claims 1 to 7 is characterized in that,
in an initial state, the blank pipe extends into the through hole I from the front end of the die assembly and then is sleeved on the outer side of the male die (5), the upper die (3) is butted with the lower die (2) through the guide rod (4), the blank pipe is extruded from top to bottom, the front end face of the die assembly is attached to the rear end face of the die assembly, and the inner wall supporting self-adaptive structure is in a tightened state;
continuously pushing the blank pipe, extruding the pipe fitting area of the blank pipe, which is in contact with the male die (5), from the non-eccentric blank pipe into an eccentric blank pipe, extending the blank pipe into the through hole II until one end of the blank pipe, which is close to the drawing die assembly, moves to the rear end of the through hole II, and stopping pushing the blank pipe;
the rotating shaft rotates and simultaneously drives all the top dies (12) to move towards the direction far away from the rotating shaft through the connecting rod, so that the end parts of the top dies (12) are propped against different areas of the inner wall of the blank pipe; and the die drawing assembly clamps the blank pipe and moves towards one side far away from the die pressing assembly until the whole blank pipe penetrates out of the through hole I, so that the eccentric blank pipe is drawn.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010830941.3A CN112058930B (en) | 2020-08-18 | 2020-08-18 | A terrace die and supporting production facility structure for drawing eccentric blank pipe |
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| CN202010830941.3A CN112058930B (en) | 2020-08-18 | 2020-08-18 | A terrace die and supporting production facility structure for drawing eccentric blank pipe |
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| CN112058930A true CN112058930A (en) | 2020-12-11 |
| CN112058930B CN112058930B (en) | 2021-06-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113974390A (en) * | 2021-09-23 | 2022-01-28 | 真有两把刷子(北京)科技有限公司 | Pipeline storage device with beam line structure for luxury goods sale |
| CN114192628A (en) * | 2021-12-10 | 2022-03-18 | 浙江大学 | Multi-sensor fusion pipe bending forming state real-time monitoring device |
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