CN116197260A

CN116197260A - Mould for producing 7-series hard alloy large hollow section bar

Info

Publication number: CN116197260A
Application number: CN202310241875.XA
Authority: CN
Inventors: 胡焱
Original assignee: Chinalco Special Aluminum Products Chongqing Co ltd
Current assignee: Chinalco Special Aluminum Products Chongqing Co ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-06-02

Abstract

The invention discloses a die for producing 7-series hard alloy large hollow profiles, wherein one side of each split bridge close to a lower die is provided with a bridge lower supporting surface protruding out of an upper die supporting surface, the protruding height of each bridge lower supporting surface is gradually increased from the upper die supporting surface to a core head, one end face of the lower die close to the upper die is concavely provided with a primary welding chamber surrounding a cavity, the circumferential side wall of the primary welding chamber is convexly provided with lower die piers corresponding to each split bridge one by one, one side of each lower die pier close to the upper die is provided with a pier supporting surface respectively matched with the corresponding bridge lower supporting surface, and each pier supporting surface is inclined to the cavity from the lower die supporting surface, so that the technical problems of insufficient structural strength and extremely short service life of the 7-series large hollow profile die are solved.

Description

Mould for producing 7-series hard alloy large hollow section bar

Technical Field

The invention relates to the technical field of extrusion dies, in particular to a die for producing 7-series hard alloy large hollow profiles.

Background

One common alloy of the 7-series aluminum alloys is the most strong alloy of the more common aluminum alloys. Because of the characteristic of large strength of the 7-series aluminum alloy, the hollow 7-series section bars are small-sized sections, and large-sized hollow 7-series section bars are not seen.

The large cavity section bar means that the mold core is larger, the dead zone is larger during extrusion, the service life of the existing small 7-system hollow section bar mold is extremely low, the phenomenon that the mold is scrapped due to split bridge when the mold is just on machine is common, and the risk of scrapping the mold is only higher if the large hollow section bar mold is designed along with the existing small hollow section bar mold. If the extrusion continuity is satisfied by putting more dies, the problem of producing 7-series large hollow profiles can be solved to some extent, but the production cost is high.

Solving the above problems is urgent.

Disclosure of Invention

The invention provides a die for producing 7-series hard alloy large-scale hollow section, which aims to solve the technical problems of insufficient structural strength and extremely short service life of 7-series large-scale hollow section dies.

The technical scheme is as follows:

the die for producing the 7-series hard alloy large hollow section comprises an upper die and a lower die matched with the upper die, wherein the lower die is provided with a cavity penetrating through end surfaces at two ends of the lower die, the upper die is provided with a core head matched with the cavity, after the core head stretches into the cavity, gaps between the core head and the cavity form die holes, four circumferentially distributed diversion holes are formed in the upper die, diversion bridges are arranged between every two adjacent diversion holes, one end surface of the upper die, which is close to the lower die, is provided with an upper die supporting surface in a circular plane structure, and one end surface of the lower die, which is close to the upper die, is provided with a lower die supporting surface matched with the upper die supporting surface; the side, close to the lower die, of each split bridge forms a bridge lower supporting surface protruding out of the upper die supporting surface, the protruding height of each bridge lower supporting surface gradually increases from the upper die supporting surface to the core head, one end face, close to the upper die, of the lower die is concavely formed with a primary welding chamber surrounding the cavity, the circumferential side wall of the primary welding chamber is convexly formed with lower die piers corresponding to the split bridges one by one, one side, close to the upper die, of each lower die pier is formed with pier supporting surfaces respectively matched with the corresponding bridge lower supporting surfaces, and each pier supporting surface is inclined to the cavity from the lower die supporting surface;

when the upper die is connected with the lower die, the upper die supporting surface is closely and closely supported on the lower die supporting surface, and each bridge lower supporting surface is closely and closely supported on the corresponding bridge pier supporting surface respectively.

Compared with the prior art, the invention has the beneficial effects that:

1. the space multi-surface matching of a plurality of bridge lower supporting surfaces and pier supporting surfaces is added besides the plane matching of the conventional upper die supporting surfaces and the conventional lower die supporting surfaces, so that the reliability of the upper die supporting and matching with the lower die supporting is greatly improved, the integral strength of the die is greatly improved, the continuous extrusion of large 7-series hollow sectional materials can be met, the service life of the die is greatly prolonged, and the production cost is reduced;

2. through the cooperation of underbridge bearing surface and pier bearing surface to can provide reliable support to each reposition of redundant personnel bridge through each lower mould pier, avoid the reposition of redundant personnel bridge to appear the crack or fracture, further reduced the risk of scrapping of mould, further improved the life of mould, further reduced manufacturing cost.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a schematic diagram of the structure of the present invention;

FIG. 3 is a schematic view of one view of the upper mold;

FIG. 4 is a schematic view of another view of the upper mold;

fig. 5 is a schematic view of the structure of the lower die.

Detailed Description

The invention is further described below with reference to examples and figures.

As shown in fig. 1 and 2, a die for producing 7-series hard alloy large hollow section mainly comprises an upper die 2 and a lower die 1 matched with the upper die 2, wherein the lower die 1 is provided with a cavity 11 penetrating through the end surfaces of two ends of the lower die, the upper die 2 is provided with a core head 21 matched with the cavity 11, and after the core head 21 stretches into the cavity 11, a gap between the core head 21 and the cavity forms a die hole a. In this embodiment, the upper die 2 and the lower die 1 are both cylindrical structures, and the diameters of the two are equal.

The die hole A consists of two long-side runners which are parallel to each other and two short-side runners which are parallel to each other, and two ends of the two long-side runners extend out of the two short-side runners respectively.

Referring to fig. 4 and 5, four diversion holes 22 distributed along the circumferential direction are formed in the upper die 2, diversion bridges 23 are arranged between adjacent diversion holes 22, and the four diversion bridges 23 are arranged in a cross shape. And, each branch flow hole 22 is kept away from the chamfer 221 of circumference distribution all has to be had to the one end of lower mould 1, through the design of chamfer, extrusion resistance when can effectively reduce the cast rod and get into branch flow hole 22.

Further, the cross-sectional area of the end of each of the tap holes 22 away from the lower die 1 is gradually increased toward the direction away from the lower die 1, and by such a design, the extrusion resistance when the casting rod enters the tap hole 22 can be further reduced.

The end face of the upper die 2, which is close to the lower die 1, is provided with an upper die supporting surface 24 in a circular ring-shaped plane structure, and the end face of the lower die 1, which is close to the upper die 2, is provided with a lower die supporting surface 12 matched with the upper die supporting surface 24, namely: the lower die supporting surface 12 is also a circular planar structure, and when the upper die 2 is connected with the lower die 1, the upper die supporting surface 24 is closely and snugly supported on the lower die supporting surface 12.

The side of each split bridge 23 close to the lower die 1 is provided with an under-bridge supporting surface 231 protruding out of the upper die supporting surface 24, the protruding height of each under-bridge supporting surface 231 gradually increases from the upper die supporting surface 24 to the core 21, one end face of the lower die 1 close to the upper die 2 is concavely provided with a primary welding chamber 16 surrounding the cavity 11, the circumferential side wall of the primary welding chamber 16 is convexly provided with lower die piers 13 corresponding to each split bridge 23 one by one, one side of each lower die piers 13 close to the upper die 2 is provided with a pier supporting surface 131 respectively matched with the corresponding under-bridge supporting surface 231, and each pier supporting surface 131 is inclined to the cavity 11 from the lower die supporting surface 12. Therefore, when the upper die 2 is connected to the lower die 1, each of the under-bridge support surfaces 231 is closely supported on the corresponding bridge pier support surface 131, respectively.

In this embodiment, in addition to the planar cooperation of the conventional upper die supporting surface 24 and the lower die supporting surface 12, the space multi-surface cooperation of the plurality of bridge lower supporting surfaces 231 and the bridge pier supporting surface 131 is increased, the reliability of the supporting cooperation of the upper die 2 and the lower die 1 is greatly improved, and the overall strength of the die is greatly improved, so that the continuous extrusion of large 7-series hollow profiles can be met, the service life of the die is greatly prolonged, and the production cost is reduced.

The width of the lower die bridge pier 13 gradually decreases toward the direction approaching the central axis of the lower die 1, so that the size of the lower die bridge pier 13 can be increased as much as possible on the premise of reducing the influence on the metal flow as much as possible, and the supporting reliability of the upper die 2 can be further improved. In this embodiment, the outer end surfaces of the lower die bridge piers 13 are arc-shaped, so that a petal structure is formed together, and the influence on the flow of metal can be further reduced.

Further, referring to fig. 1, each bridge under-support surface 231 forms a conical surface structure together in space, and each bridge pier support surface 131 forms a conical surface structure together in space, so that each bridge under-support surface 231 can be respectively matched with the corresponding conical surface of the bridge pier support surface 131, the reliability of support can be further improved, and the occurrence of cracks or breakage of the split bridge 23 can be further avoided.

In general, the split-flow bridges 23 are connected with the core print 21 through flat lacing wires, please refer to fig. 4, one side of each split-flow bridge 23 close to the lower die 1 is provided with diagonal lacing wires 232 connecting the corresponding under-bridge supporting surface 231 and the core print 21, each diagonal lacing wire 232 extends to the core print 21 from the height of the corresponding under-bridge supporting surface 231 gradually and increases, and compared with the conventional flat lacing wires, the diagonal lacing wires 232 not only support better stability, but also can increase the structural strength of the split-flow bridge 23, and further reduce the possibility of cracking or breaking of the split-flow bridge 23.

Referring to fig. 2 and 5, the bottom of the primary welding chamber 16 is recessed with a secondary welding chamber 14 surrounding the cavity 11, and the width of each part of the secondary welding chamber 14 is the same, namely: the appearance structure of the secondary welding chamber 14 is similar to that of the die hole A, so that the uniformity of feeding of each part of the die hole A can be effectively improved, and the forming quality of the section bar can be improved.

Referring to fig. 1 and 4, the outer peripheral surface of the core print 21 is convexly formed with an upper die working belt 212, a side of the upper die working belt 212 away from the lower die 1 is concavely formed with sublingual empty cutters 211 circumferentially distributed on the outer peripheral surface of the core print 21, and deepened empty cutters 211a circumferentially distributed are concavely formed on the sublingual empty cutters 211. By adding the deepening empty knife 211a, the welding area is increased, and the supply of metal under the bridge is facilitated, so that the risk of poor quality of the welding line of the profile is effectively reduced. In this embodiment, the depth of the deepened cutter 211a is preferably 10 to 15mm, which is advantageous for supplying the underbridge metal and also ensures the structural strength of the core print 21.

Referring to fig. 1, the cavity wall of the cavity 11 has a ring of lower die working belt 15 adapted to the upper die working belt 212, a gap between the upper die working belt 212 and the lower die working belt 15 forms a die hole a, the lower die working belt 15 has a sizing section 151 and an inlet section 152 sequentially connected in a direction approaching to the upper die 2, an axial dimension of an outer peripheral surface of the sizing section 151 remains unchanged, and an outer peripheral surface of the inlet section 152 has a tapered surface structure with a diameter gradually increasing in a direction away from the sizing section 151. In this embodiment, the taper of the outer peripheral surface of the inlet section 152 is 2 °, and the micro taper design of the inlet section 152 is beneficial to ensuring the surface quality of the extruded profile during high-speed extrusion. Meanwhile, the axial length of the sizing section 151 is equal to that of the inlet section 152, so that the resistance during sizing can be eliminated to the greatest extent, the dimensional accuracy of the profile is improved, and the surface quality and the controllable size of the profile during high-speed extrusion are ensured.

In this embodiment, the diameter of the circumcircle formed by the diversion holes 22 is 20mm smaller than the diameter of the casting rod, so that dirt such as oxide skin on the surface layer of the casting rod is prevented from entering the diversion holes 22 of the die, and the product quality is ensured.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a mould for producing 7 large-scale hollow section bar of hard alloy, includes mould (2) and lower mould (1) of upper mould (2) looks adaptation, lower mould (1) have cavity (11) that run through its both ends terminal surface, upper mould (2) have with cavity (11) looks adaptation core print (21), after this core print (21) stretches into cavity (11), gap between the two constitutes nib (A), offer four on upper mould (2) along the reposition of redundant personnel hole (22) of circumference distribution, all be provided with reposition of redundant personnel bridge (23) between adjacent reposition of redundant personnel hole (22), upper mould (2) are close to the terminal surface of lower mould (1) have and are ring shape plane structure's upper mould holding surface (24), the terminal surface of lower mould (1) is close to the terminal surface of upper mould (2) has lower mould holding surface (12) with upper mould holding surface (24) looks adaptation; the method is characterized in that: the side, close to the lower die (1), of each split bridge (23) is provided with an under-bridge supporting surface (231) protruding out of an upper die supporting surface (24), the protruding height of each under-bridge supporting surface (231) is gradually increased from the upper die supporting surface (24) to the core head (21), one end face, close to the upper die (2), of the lower die (1) is concavely provided with a primary welding chamber (16) surrounding a cavity (11), the circumferential side wall of the primary welding chamber (16) is convexly provided with lower die bridge piers (13) corresponding to each split bridge (23) one by one, one side, close to the upper die (2), of each lower die bridge pier (13) is provided with bridge pier supporting surfaces (131) respectively matched with the corresponding under-bridge supporting surfaces (231), and each bridge pier supporting surface (131) is inclined to the cavity (11) from the lower die supporting surface (12);

when the upper die (2) is connected with the lower die (1), the upper die supporting surface (24) is closely and snugly supported on the lower die supporting surface (12), and each bridge lower supporting surface (231) is closely and snugly supported on the corresponding bridge pier supporting surface (131).

2. A mould for producing 7-series hard alloy large hollow profiles according to claim 1, characterized in that: the under-bridge support surfaces (231) form a conical surface structure together in space, and the bridge pier support surfaces (131) form a conical surface structure together in space, so that the under-bridge support surfaces (231) can be matched with the corresponding bridge pier support surfaces (131) in a conical surface mode respectively.

3. A mould for producing 7-series hard alloy large hollow profiles according to claim 1, characterized in that: each shunt bridge (23) is provided with an inclined lacing wire (232) connected with the corresponding under-bridge supporting surface (231) and the core head (21) at one side close to the lower die (1), and each inclined lacing wire (232) extends to the core head (21) from the height of the corresponding under-bridge supporting surface (231) in a gradually increasing mode.

4. A mould for producing 7-series hard alloy large hollow profiles according to claim 1, characterized in that: one end of each flow dividing hole (22) far away from the lower die (1) is provided with a chamfer (221) which is circumferentially distributed.

5. A mould for producing 7-series hard alloy large hollow profiles according to claim 1, characterized in that: the bottom of the primary welding chamber (16) is concavely provided with a secondary welding chamber (14) which surrounds the cavity (11), and the width of each part of the secondary welding chamber (14) is the same.

6. A mould for producing 7-series hard alloy large hollow profiles according to claim 1, characterized in that: an upper die working belt (212) is formed on the outer peripheral surface of the core head (21) in a protruding mode, sublingual empty cutters (211) circumferentially distributed on the outer peripheral surface of the core head (21) are formed on one side, far away from the lower die (1), of the upper die working belt (212) in a recessed mode, and deepening empty cutters (211 a) circumferentially distributed on the sublingual empty cutters (211) in a recessed mode.

7. A mould for producing 7-series hard alloy large hollow profiles according to claim 6, characterized in that: the cavity wall of the cavity (11) is provided with a circle of lower die working belt (15) which is matched with the upper die working belt (212), a gap between the upper die working belt (212) and the lower die working belt (15) forms the die hole (A), the lower die working belt (15) is provided with a sizing section (151) and an inlet section (152) which are sequentially connected towards the direction close to the upper die (2), the axial size of the outer peripheral surface of the sizing section (151) is kept unchanged, and the outer peripheral surface of the inlet section (152) is of a conical surface structure with gradually increased diameter towards the direction far away from the sizing section (151).

8. A mould for producing 7-series hard alloy large hollow profiles according to claim 7, characterized in that: the axial length of the sizing section (151) is equal to the axial length of the inlet section (152).

9. A mould for producing 7-series hard alloy large hollow profiles according to claim 7, characterized in that: the taper of the outer peripheral surface of the inlet section (152) is 2 degrees.

10. A mould for producing 7-series hard alloy large hollow profiles according to claim 1, characterized in that: the diameter of the circumscribing circle formed by the diversion holes (22) is 20mm smaller than the diameter of the casting rod.