Double-hole flat die capable of improving extrusion efficiency of superhard alloy round bar and mounting structure of double-hole flat die

Abstract

The utility model discloses a double-hole flat die capable of improving the extrusion efficiency of a superhard alloy round bar and a mounting structure of the double-hole flat die, which are characterized in that a working belt is designed to be gradually reduced towards the direction far away from the central axis of a die body, and the width of a flow guide pit is designed to be gradually increased towards the direction far away from the central axis of the die body; according to the invention, the feeding of the casting rod to the two die holes is optimized, so that the metal flowing speed and the metal supply quantity of each position of the die holes approach to be consistent, the extrusion speed is improved, the straightness of the extruded superhard alloy round rod is very good, and meanwhile, the die is optimized from elastic strain to plastic strain, so that the possibility of die surface deformation is greatly reduced, and the production efficiency is improved. And the mold repairing frequency of the mold is greatly reduced, the service life of the mold is prolonged, and the maintenance cost of the mold is reduced. Moreover, the supporting pad is additionally arranged between the double-hole flat die and the die pad, so that the die surface can be supported more reliably, and the possibility of deformation of the die surface is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of alloy extrusion tools, in particular to a double-hole flat die capable of improving the extrusion efficiency of superhard alloy round bars and a mounting structure thereof. Background Art

[0002] Extrusion molding is a key link in the alloy profile manufacturing process. At present, in the extrusion production of super-hard alloy round bars such as 7075, due to the problem of low extrusion efficiency, a double-mold hole design is usually adopted in the mold design to improve production capacity. However, when using a double-mold hole mold to extrude hard alloy, the mold is under a high extrusion pressure state for a long time, which not only easily causes the problem of mold surface deformation, resulting in the need for frequent mold repairs and high mold maintenance costs, but also due to the uneven flow rate of the double holes, the two extruded super-hard alloy round bars are in an "eight" shape, that is: the straightness of the two extruded super-hard alloy round bars is not good, there is an outward bending problem, and the distance between the two extruded super-hard alloy round bars gradually increases in the direction away from the mold outlet.

[0003] Solving the above problems has become a top priority. Utility Model Content

[0004] In order to solve the technical problem that when using the existing double-hole flat die to extrude super-hard alloy round bars, not only is the die surface easily deformed, but the super-hard alloy round bars extruded have poor straightness, the utility model provides a double-hole flat die and its installation structure which can improve the extrusion efficiency of super-hard alloy round bars.

[0005] The technical solution is as follows:

[0006] The first aspect of the present application relates to a double-hole flat die capable of improving the extrusion efficiency of super-hard alloy round rods, comprising a die body, on which two die holes are axially penetrated, and the two die holes are symmetrically distributed on both sides of the central axis of the die body, and the middle sections of the die holes are extrusion shaping sections with circular hole structures, and the feed ends of the die holes are expanded to form guide pits connected to the feed ends of the extrusion shaping sections, and the discharge ends of the die holes are expanded to form profile outlets connected to the discharge ends of the extrusion shaping sections, and the circumferential side walls of the extrusion shaping sections are working bands, and the axial lengths of the working bands gradually decrease in the direction away from the central axis of the die body, and the guide pits are all concave pit structures, and the spacing between the circumferential side walls of the guide pits and the corresponding working bands gradually increases in the direction away from the central axis of the die body.

[0007] By using the above double-hole flat die that can improve the extrusion efficiency of cemented carbide round bars, through designing the working belt to gradually decrease in the direction away from the central axis of the die body, and designing the width of the diversion pit to gradually increase in the direction away from the central axis of the die body, the feeding of the casting bar to the two die holes is optimized, making the metal flow velocity and metal supply amount at each position of the die hole approach consistency. This not only improves the extrusion speed and production efficiency, but also the straightness of the extruded cemented carbide round bar is very good. At the same time, the die is optimized from elastic strain to plastic strain, thus greatly reducing the possibility of die surface deformation, significantly reducing the die repair frequency, increasing the service life of the die, and reducing the die maintenance cost.

[0008] The second aspect of the present application relates to an installation structure of a double-hole flat die, including a support pad, a die pad, and the above double-hole flat die that can improve the extrusion efficiency of cemented carbide round bars. The support pad and the die pad are coaxially and sequentially connected to the discharge end of the die body. Two support pad through holes respectively communicating with the corresponding die holes are provided on the support pad. The support pad through holes are all circular hole structures, and the circumferential outer wall of the support pad through holes surrounds the circumferential outer side of the discharge end of the profile outlet. Two die pad through holes respectively communicating with the corresponding support pad through holes are provided on the die pad. The die pad through holes are all circular hole structures, and the circumferential outer wall of the die pad through holes surrounds the circumferential outer side of the discharge end of the die pad through holes.

[0009] By using the above installation structure of the double-hole flat die, by adding a support pad between the double-hole flat die and the die pad, more reliable support can be provided for the die surface, further reducing the possibility of die surface deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of the double-hole flat die;

[0011] Figure 2 is a cross-sectional view of the double-hole flat die;

[0012] Figure 3 is a schematic diagram of the cooperation relationship among the double-hole flat die, the support pad, and the die pad;

[0013] Figure 4 is Figure 3 the cross-sectional view of. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following further illustrates the present invention in conjunction with embodiments and drawings.

[0015] Embodiment 1:

[0016] As shown in Figure 1 and Figure 2As shown in the figure, a double-hole flat die capable of improving the extrusion efficiency of cemented carbide round bars mainly includes a die body 1. Axially penetrating through the die body 1 are two die holes 11, that is, the two die holes 11 are arranged in parallel along the central axis direction of the die body 1, and the two die holes 11 are symmetrically distributed on both sides of the central axis of the die body 1. This symmetrical arrangement is conducive to improving the straightness of the cemented carbide round bars obtained by extrusion.

[0017] In this embodiment, the middle sections of the die holes 11 are all extrusion sizing sections 112 in the shape of round holes, where the metal flows and is shaped. The circumferential side walls of the extrusion sizing sections 112 are all working bands 112a, and the axial lengths of the working bands 112a gradually decrease in the direction away from the central axis of the die body 1, that is, the position of the working band 112a closest to the central axis of the die body 1 is the longest, and the position of the working band 112a farthest from the central axis of the die body 1 is the shortest. Moreover, the length of the working band 112a gradually increases from the position closest to the central axis of the die body 1 to the position farthest from the central axis of the die body 1 and shows a smooth transition. While realizing continuous and stable extrusion, it also ensures a relatively fast extrusion speed during the production process, improving the production efficiency.

[0018] Furthermore, the axial length of the working band 112a is 3 mm to 5.5 mm, which not only ensures the extrusion efficiency but also ensures the straightness of the cemented carbide round bars obtained by extrusion.

[0019] The feeding ends of the die holes 11 are all expanded in diameter to form diversion pits 111 communicating with the feeding ends of the extrusion sizing sections 112. The function of the diversion pits 111 is similar to the bonding chamber of a split die, which can make the metal flow velocity and metal supply amount at each position of the die hole approach consistency, improving the straightness of the cemented carbide round bars obtained by extrusion. In this embodiment, the diversion pits 111 are all concave pit structures, and the distance between the circumferential side walls of the diversion pits 111 and the corresponding working bands 112a gradually increases in the direction away from the central axis of the die body 1.

[0020] In the prior art, due to the unreasonable volume design of the diversion pits 111, when cutting off the cast bar A of the upset with a trimming shear, the amount of residual metal in the diversion pits 111 is unreasonable, and continuous extrusion cannot be achieved. Therefore, in this embodiment, the volume of the diversion pits 111 is preferably 4.36% to 6.85% of the volume of the upset residue A of the cast bar. The residual metal a in the diversion pits 111 can be integrated with the head end of the next cast bar. During the extrusion process, the cemented carbide round bars extruded from the two ingots A are connected end to end. After the cemented carbide round bars are extruded from the extrusion barrel, they are pulled and broken by the traction force of the tractor. This process greatly avoids the "eight" deformation of the cemented carbide round bars extruded from the double holes, thereby improving the stability of the extrusion process and also making the production uninterrupted, improving the production efficiency.

[0021] Therefore, in this embodiment, by designing the working belt 112a to gradually decrease in the direction away from the central axis of the die body 1 and designing the width of the diversion pit 111 to gradually increase in the direction away from the central axis of the die body 1, the feeding of the casting rod to the two die holes 11 is optimized, making the metal flow velocity and metal supply amount at each position of the die hole 11 approach consistency. This not only increases the extrusion speed and production efficiency, but also the straightness of the extruded superhard alloy round bar is very good. At the same time, the die is optimized from elastic strain to plastic strain, thus greatly reducing the possibility of die surface deformation, significantly reducing the die repair frequency, increasing the service life of the die, and reducing the die maintenance cost.

[0022] Furthermore, the volume of the residual metal a in the diversion pit 111 is 40% - 65% of the volume of the diversion pit 111, further ensuring that the heads and tails of the superhard alloy round bars extruded from the two ingots A are connected end to end.

[0023] In this embodiment, the depths at all positions of the diversion pit 111 are the same, which not only facilitates the processing of the diversion pit 111, but also facilitates the control of the metal flow in the diversion pit 111.

[0024] Furthermore, the diversion pits 111 are all circular hole structures, and the central axes of the two diversion pits 111 are respectively located on the side away from the central axis of the die body 1 of the central axis of the corresponding extrusion shaping section 112, further reducing the processing difficulty of the diversion pits 111.

[0025] In this embodiment, the discharging ends of the die holes 11 are all expanded in diameter to form profile outlets 113 communicating with the discharging ends of the extrusion shaping sections 112, ensuring the smoothness of discharging. Furthermore, the profile outlet 113 is a conical surface structure with a radius gradually increasing in the direction away from the extrusion shaping section 112, further avoiding the possibility of interference.

[0026] Embodiment 2:

[0027] As Figures 3 - 4 , an installation structure of a double-hole flat die, including a support pad 2, a die pad 3, and the double-hole flat die in Embodiment 1 that can improve the extrusion efficiency of the superhard alloy round bar. The double-hole flat die, the support pad 2, and the die pad 3 are all cylindrical structures with the same radius. And the support pad 2 and the die pad 3 are coaxially connected in sequence to the discharging end of the die body 1. Two support pad through holes 21 respectively communicating with the corresponding die holes 11 are provided on the support pad 2. The support pad through holes 21 are all circular hole structures, and the circumferential outer wall of the support pad through holes 21 surrounds the circumferential outer side of the discharging end of the profile outlet 113. Two die pad through holes 31 respectively communicating with the corresponding support pad through holes 21 are provided on the die pad 3. The die pad through holes 31 are all circular hole structures, and the circumferential outer wall of the die pad through holes 31 surrounds the circumferential outer side of the discharging end of the die pad through holes 31.

[0028] Therefore, by adding a support pad 2 between the double-hole flat die and the die cushion 3, more reliable support can be provided for the die surface, further reducing the possibility of die surface deformation of the double-hole flat die.

[0029] Moreover, the apertures of the profile outlet 113, the support pad through-hole 21, and the die cushion through-hole 31 are enlarged in a stepped manner, further reducing the possibility of interference during the discharge of the cemented carbide round bar.

[0030] Finally, it should be noted that the above description is only the preferred embodiment of the present invention. Under the inspiration of the present invention, those of ordinary skill in the art can make various similar representations without departing from the purpose and claims of the present invention, and such transformations all fall within the protection scope of the present invention.

Claims

1. A double-hole flat die capable of improving the extrusion efficiency of superhard alloy round rods, comprising a die body (1), wherein two die holes (11) are axially penetrated on the die body (1), and the two die holes (11) are symmetrically distributed on both sides of the central axis of the die body (1), and the middle section of the die hole (11) is an extrusion shaping section (112) with a circular hole structure, and the feed end of the die hole (11) is expanded to form a guide pit (111) connected to the feed end of the extrusion shaping section (112), and the discharge end of the die hole (11) is expanded to form a profile outlet (113) connected to the discharge end of the extrusion shaping section (112), and the circumferential side wall of the extrusion shaping section (112) is a working belt (112a), characterized in that: The axial length of the working belt (112a) gradually decreases in the direction away from the central axis of the mold body (1), the diversion pits (111) are all concave pit structures, and the distance between the circumferential side wall of the diversion pit (111) and the corresponding working belt (112a) gradually increases in the direction away from the central axis of the mold body (1).

2. The double-hole flat die capable of improving the extrusion efficiency of superhard alloy round rods according to claim 1 is characterized in that: The volume of the diversion pit (111) is 4.36% to 6.85% of the volume of the residual material (A) of the cast rod.

3. The double-hole flat die capable of improving the extrusion efficiency of superhard alloy round rods according to claim 1 or 2, characterized in that: The depth of each position of the diversion pit (111) is consistent.

4. The double-hole flat die capable of improving the extrusion efficiency of superhard alloy round rods according to claim 3 is characterized in that: The diversion pits (111) are all circular hole structures, and the central axes of the two diversion pits (111) are respectively located on the side of the central axis of the corresponding extrusion shaping section (112) away from the central axis of the mold body (1).

5. The double-hole flat die capable of improving the extrusion efficiency of superhard alloy round rods according to claim 1, characterized in that: The axial length of the working belt (112a) is 3 mm to 5.5 mm.

6. The double-hole flat die capable of improving the extrusion efficiency of superhard alloy round rods according to claim 1, characterized in that: The profile outlet (113) is a conical structure whose radius gradually increases in a direction away from the extrusion shaping section (112).

7. A mounting structure for a double-hole flat die, characterized in that: The invention comprises a support pad (2), a die pad (3) and a double-hole flat die capable of improving the extrusion efficiency of super-hard alloy round rods as described in any one of claims 1 to 6, wherein the support pad (2) and the die pad (3) are coaxially connected in sequence to the discharge end of the die body (1), the support pad (2) is provided with two support pad through holes (21) respectively connected to the corresponding die holes (11), the support pad through holes (21) are all circular hole structures, and the circumferential outer walls of the support pad through holes (21) surround the circumferential outer side of the discharge end of the profile outlet (113), the die pad (3) is provided with two die pad through holes (31) respectively connected to the corresponding support pad through holes (21), the die pad through holes (31) are all circular hole structures, and the circumferential outer walls of the die pad through holes (31) surround the circumferential outer side of the discharge end of the die pad through holes (31).

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