CN105149375A - Supercharged multichannel pipe divergent die composite die core - Google Patents

Abstract

The invention belongs to the field of micro-aperture multi-channel pipe material preparation, and provides a pressurized multi-channel pipe material splitting mold combined mold core, including a mold core, a lower mold and a lower mold support plate; the center of the lower mold is provided with a lower mold through hole The outer contour of the lower mold support plate is the same as the shape and size of the lower mold through hole, the thickness is smaller than the thickness of the lower mold, and it is located inside the lower mold through hole; the bottom of the mold core is equipped with a plurality of upper mold core needles, and the lower mold support plate The top is equipped with a plurality of lower mold core needles that cooperate with the upper mold core needle; the inner wall of the lower mold is symmetrically opened with two horizontal sliding grooves; the spring and the boss slider connected with the spring are fixed horizontally in the sliding groove; the boss The slider includes a boss and a base; a supporting groove matching the front end of the boss is opened on the supporting plate of the lower mold, and the supporting plate of the lower mold is supported inside the through hole of the lower mold through the boss; the front end of the boss shrinks into the sliding groove Can be fixed in the sliding groove. The invention improves extrusion force, mold filling efficiency and mold filling ability during extrusion molding, and further improves product molding quality.

Description

A combination core of pressurized multi-channel pipe splitting mold

technical field

The invention belongs to the field of preparation of micro-aperture multi-channel pipes, in particular to a combined mold core of a pressurized multi-channel pipe splitting mold.

Background technique

Microchannel tube is a new type of tube developed in recent years based on the theory of micro-scale enhanced heat transfer. It adopts micro-aperture and channel close-packed structure to achieve heat transfer. Compared with conventional scale heat exchange tubes, the heat exchange efficiency can be increased by 100%. Among them, the micro-aperture multi-channel aluminum alloy heat exchange flat tube has the advantages of light weight, high heat transfer coefficient, compact structure, environmental protection, safety and reliability, etc. It has developed rapidly in demanding occasions.

Each channel of the pipe is formed by micro-fine core needles arranged in parallel, and the micro-diameter core needles are prone to elastic deformation during the hot extrusion process, resulting in fluctuations in the wall thickness of the pipe, and even more seriously, it may even cause the mold core to break. If the force is too small, it will cause problems such as insufficient extrusion filling. When the extrusion force is too high, it will easily cause the deformation and breakage of the small-diameter core needle, so that the cavity cannot be formed, and dead holes, fractures and inverted holes will be formed during the extrusion process. Ribs and other forming defects, as the main part of the heat exchanger, the stability of the forming quality of the microchannel tube is a key issue in the quality control of the heat exchanger.

Patent No. CN102581055A discloses an extrusion die prepared by a flat tube of a microchannel heat exchanger; but the disadvantage of this technology is that the core and core pins are integrated, and if one or more core pins are damaged, the entire core will be damaged. scrapped, and the recyclability is very low; in addition, the lower end of the core needle is in a suspended state, and when the extrusion force is too high, it will cause deformation or breakage of the core needle; Mold for extrusion production; but the disadvantage of this technology is that it only makes the lower mold a separate type, without any improvement on the core and core pin, the extrusion force selected during extrusion can not be increased, and the core pin is still easy to Deformation and breakage occur, so that the cavity cannot be formed, resulting in unqualified products such as dead holes.

Therefore, research on improving the extrusion force, the pressure bearing capacity of the core needle and the replaceability of the core needle during the extrusion molding of the microchannel pipe is crucial to improving the filling capacity and efficiency of the microchannel pipe and improving the recyclability of the core. Utilization and reducing the manufacturing cost of the integral mold core play a vital role.

Contents of the invention

Aiming at the deficiencies in the prior art, such as insufficient extrusion filling, dead holes, fractures, and inverted ribs, the present invention provides a pressurized multi-channel pipe splitter mold core, which avoids the need for micro-aperture multi-channel pipes During the extrusion molding process, the core needle is easy to break and deform, resulting in pipe wall thickness fluctuations and dead holes, which improves the extrusion force during work, enhances the filling efficiency and filling capacity during extrusion molding, and further improves product molding quality.

The present invention achieves the above-mentioned technical purpose through the following technical means.

A pressurized multi-channel pipe material splitting mold combination mold core, including a mold core, a lower mold and a lower mold support plate; the mold core is located in the upper part, and the lower mold is located in the lower part; the center of the lower mold is provided with a lower mold Through hole; the lower die support plate is located inside the lower die through hole, the outer contour of the lower die support plate is the same shape and size as the lower die through hole, and the thickness of the lower die support plate is less than the thickness of the lower die; The bottom of the mold core is equipped with a plurality of upper mold core needles, and the top of the lower mold support plate is equipped with a plurality of lower mold core needles matched with the upper mold core needles; the inner wall of the lower mold is symmetrically opened with two Horizontal sliding groove; the horizontally fixed spring and the boss slider matched with the sliding groove in the sliding groove; one end of the spring is against the sliding groove, and the other end is against the boss slider; the boss slider The block includes a boss and a base; the support plate of the lower mold is provided with a support groove matched with the front end of the boss, and the support plate of the lower mold is supported inside the through hole of the lower mold through the boss; the front end of the boss is narrowed Can be stuck in the sliding groove after returning to the sliding groove.

Further, the front end of the boss is wedge-shaped, and the included angle with the horizontal plane is θ; the friction coefficient between the front end of the boss and the contact surface of the support groove is μ, and the support plate of the lower mold and the lower mold core pin connected to it are always The weight is G, the initial compression of the spring is Δ, and the elastic coefficient of the spring is k, then the following equation should be satisfied: k·Δ≥G·tanθ/(2+2μ·tanθ).

Further, the lower mold support plate is a cuboid plate; the sliding groove is a cuboid groove; the base is a cuboid base; the boss is a wedge block; the lower part of the sliding groove has a connected square hole , the lower part of the square hole is provided with a threaded hole; a stop bolt is arranged in the threaded hole; the lower end of the stop spring is against the stop bolt, and the upper end is against the base; the level between the rear end of the boss and the rear end of the stop plate The distance is equal to the horizontal dimension of the support slot.

Further, the lower mold support plate is a cuboid plate; the base is a cuboid base; the sliding groove is a cuboid in the front section and a through groove of a threaded hole at the end; bolts are arranged in the threaded hole; the end of the spring is against the Bolt; the lower part of the sliding groove is provided with a connected square hole, and the lower part of the square hole is provided with a threaded hole; a stop bolt is arranged in the threaded hole, and the upper part of the stop bolt is connected with a stop spring, and the stop spring The upper part is against the ejector block; the upper part of the sliding groove is provided with a slider slot; the horizontal dimension of the slider slot is larger than that of the base, and the horizontal distance from the front end of the slider slot to the front end of the base is equal to The horizontal dimension of the support groove; the horizontal distance between the rear end of the ejector block and the front end of the base is greater than the horizontal dimension of the support groove.

Further, the upper mold core needle and the mold core, the lower mold core needle and the lower mold support plate are all detachably connected.

Further, the upper mold core needle and the mold core, the lower mold core needle and the lower mold support plate are all threaded; the end of the upper mold core needle contacting the mold core is tapped with a thread, and the other end is provided with a groove One end of the lower mold core pin contacting the lower mold support plate is tapped with a thread, and the other end is provided with a protrusion; the inner contour of the groove is the same as the outer contour shape and size of the protrusion; the upper mold The maximum cross-sectional dimensions of the core pin and the mating end of the lower core pin are the same.

Further, the longitudinal section shape of the front end of the protrusion is trapezoidal.

Further, the shape and size of the front end of the boss is the same as that of the support groove.

Further, the upper mold core pins and the lower mold core pins correspond to each other, and are arranged equidistantly on the mold core and the lower mold support plate respectively.

Further, the cross-sectional shape of the upper core pin and the lower core pin is circular, square or irregular.

Beneficial effects of the present invention:

The combined mold core of the pressurized multi-channel pipe splitting mold according to the present invention forms a buffer device by combining various components, that is, in the initial state, the supporting plate of the lower die is supported inside the through hole of the lower die through the boss, and when the extrusion process starts, When the front end of the boss is retracted into the sliding groove by force, the boss slider can be fixed in the sliding groove, so that the lower mold support plate comes out; when it needs to be reused, the boss of the boss slider can be re-supported by the lower mold support In addition, through the mating of the upper mold core needle and the lower mold core needle, the lower mold core has a supporting effect on the upper mold core needle, which jointly improves the extrusion force during the initial extrusion, and can ensure that the extruded part is fully squeezed. The shape is full without deforming or breaking the upper core pin, which improves the pressure bearing capacity of the working surface of the upper core pin, and finally improves the quality of the extruded part. The threaded connection of the upper core pin and the mold core, the lower core pin and the lower mold support plate makes the whole core manufacturing into separate manufacturing, which reduces the manufacturing cost of the overall core; in addition, the wear or tear of the upper core pin or Damage can be achieved by dismantling and replacing instead of replacing the entire core, which saves resources and is easy to repair; the cross-sectional shape of the upper core pin and the lower core pin can be designed as circular, square or irregular according to actual needs , to meet different market demands.

Description of drawings

Fig. 1 is a structural diagram of a combined mold core of a pressurized multi-channel pipe splitting mold according to Embodiment 1 of the present invention.

Fig. 2 is a structural diagram of the combined mold core of the pressurized multi-channel pipe splitting mold according to Embodiment 2 of the present invention.

Figure 3 is a sectional view of the mold core and the upper mold core needle.

Figure 4 is a cross-sectional view of the lower mold support plate and the lower mold core needle.

Fig. 5 is a top view of the lower mold, the lower mold support plate and the lower mold core needle.

Fig. 6 is a connection diagram of the boss slider at the front end of the boss and the lower mold support plate in Embodiment 1.

Fig. 7 is a connection diagram of the boss slider at the front end of the boss and the lower mold support plate in embodiment 2.

The reference signs are explained as follows:

1-mold core, 2-upper die core needle, 3-lower die, 4-lower die through hole, 5-lower die core pin, 6-lower die support plate, 7-boss slider, 8-spring, 9 -square hole, 10-sliding slot, 11-support slot, 12-stop plate, 13-stop spring, 14-stop bolt, 15-ejector block, 16-bolt, 17-slider slot, 201 - groove, 501 - protrusion, 701 - boss, 702 - base.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

Example 1:

As shown in Fig. 1 and Fig. 5, a kind of pressurized multi-channel pipe splitting mold combined mold core comprises mold core 1, lower mold 3 and lower mold support plate 6; described mold core 1 is positioned at the upper part, and described lower mold 3 are located in the lower part, and jointly constitute the periphery of the combined mold core; the center of the lower mold 3 has a cuboid lower mold through hole 4; the lower mold support plate 6 is located inside the lower mold through hole 4, and the lower mold support plate The outer contour of 6 is identical to the shape and size of the lower mold through hole 4, so that the outer wall of the lower mold support plate 6 can be close to the inner wall of the lower mold 3; the thickness of the lower mold support plate 6 is less than the thickness of the lower mold 3, so that The lower mold support plate 6 can be placed in the lower mold through hole 4 of the lower mold 3 .

As shown in Figure 3, the bottom of the core 1 is equipped with a plurality of upper core pins 2 equidistantly arranged; the upper core pins 2 and the core 1 are threaded, and the upper core pins 2 contact One end of the mold core 1 is tapped with a fine-tooth common thread, and the other end is provided with a groove 201; Corresponding lower mold core needles 5 that cooperate with each other; the lower mold core needles 5 and the lower mold support plate 6 are both threaded, and the end of the lower mold core needle 5 that contacts the lower mold support plate 6 is tapped with a fine-tooth ordinary thread , the other end is provided with a protrusion 501; the inner contour of the groove 201 is the same as the outer contour shape and size of the protrusion 501, and the maximum cross-sectional shape and The size is the same, the upper mold core needle 2 and the lower mold core needle 5 are mated to form a whole with the same cross-sectional size; the manufacturing of the overall mold core is changed into a separate manufacturing, which reduces the manufacturing cost of the overall mold core; in addition, The wear or damage of the upper mold core pin can be achieved by removing and replacing the entire mold core, which saves resources and is easy to repair; in order to further make the protrusion 501 more convenient and quick to insert into the groove 201, the protrusion 501 The longitudinal section shape of the front end is designed to be trapezoidal.

The lower mold support plate 6 is a cuboid plate; the sliding groove 10 is a cuboid groove; the base 702 is a cuboid base; the inner wall of the lower mold 3 is symmetrically provided with two transverse sliding grooves 10; A spring 8 and a boss slider 7 connected to the spring 8 are laterally fixed in the sliding groove 10, and the front end of the boss 701 of the boss slider 7 is wedge-shaped, and the angle between the horizontal plane is θ; the lower mold support plate 6 is provided with a support groove 11 matched with the front end of the boss 701 of the boss slider 7, and the shape and size of the front end of the boss 701 is the same as that of the support groove 11. The coefficient of friction between the boss 701 and the support groove 11 is μ, the total weight of the lower mold support plate 6 and the lower mold core pin 5 connected to it is G, the initial compression of the spring 8 is Δ, and the boss 701 passes through the support groove 11 The normal force F generated by the support plate 6 of the lower die and the initial elastic force H=k·Δ of the spring 8 should satisfy the relationship: H=k·Δ=F·sinθ, so F=k·Δ/sinθ, convex The upward support force N=k·Δ/tanθ of the platform 701 to the lower die support plate 6 through the support groove 11, the friction force f=μF=μk·Δ/sinθ between the boss 701 and the support groove 11, the boss 701 and The frictional force f between the support grooves 11 produces an upward support force Q to the lower mold support plate 6, Q=f sinθ=μk Δ/sinθ sinθ=μk Δ; in order to make the lower mold support plate 6 and with it The connected lower mold core needle 5 is in a balanced state, and 2·(N+Q)=G is established, that is, 2·(k·Δ/tanθ+μk·Δ)=G, H=k·Δ=G·tanθ/( 2+2μ·tanθ), so the initial elastic force of the spring 8 H≥G·tanθ/(2+2μ·tanθ).

The boss 701 is a wedge-shaped block; the bottom of the sliding groove 10 is provided with a connected square hole 9, and the bottom of the square hole 9 is provided with a threaded hole; a stop bolt 14 is arranged in the threaded hole; The lower end is against the stop bolt 14, and the upper end is against the base 702; the horizontal distance between the rear end of the boss 701 and the rear end of the stop plate 12 is equal to the horizontal dimension of the support groove 11; that is, as shown in Figure 6, the The horizontal distance S between the rear end of the boss 701 and the rear end of the stop plate 12 is equal to the horizontal dimension of the support groove 11 , which is L·cosθ, where L is the hypotenuse of the cross-section of the support groove 11 .

Before the extrusion starts, the extruded material is aluminum alloy. First, the upper mold core needle 2 is screwed into the bottom of the mold core 1, and the lower mold core needle 5 is screwed into the top of the lower mold support plate 6; the lower mold support plate 6 and the lower mold core The needle 5 is placed in the through hole 4 of the lower mold, the supporting plate 6 of the lower mold is supported in the through hole 4 of the lower mold through the boss slider 7 and the spring 8, and the lower mold core needle 5 is mated with the upper mold core needle 2 to realize seamless Connection; the stop plate 12 and the stop spring 13 are put into the threaded hole of the stop bolt, and the stop bolt 14 is screwed in the threaded hole of the stop bolt, so that the stop plate 12 withstands the boss slide block 7 . The spring 8 is compressed for a distance of Δ, the initial elastic force generated is H=k·Δ (k is the elastic coefficient), the horizontal force acting on the boss slider 7 is H=k·Δ, and the boss 701 passes through the support groove 11 The normal force F generated on the lower mold support plate 6 and the initial elastic force H=k·Δ of the spring 8 should satisfy the relation: H=k·Δ=F·sinθ, so F=k·Δ/sinθ, the boss 701 through the support groove 11 to the upper support force of the lower die support plate 6 N=k·Δ/tanθ, the friction force f=μF=μk·Δ/sinθ between the boss 701 and the support groove 11, the boss 701 and the support The frictional force f between the grooves 11 produces an upward supporting force Q to the lower mold support plate 6, Q=f sinθ=μk Δ/sinθ sinθ=μk Δ; in order to connect the lower mold support plate 6 with it The lower mold core needle 5 is in a balanced state, and 2·(N+Q)=G is established, that is, 2·(k·Δ/tanθ+μk·Δ)=G, H=k·Δ=G·tanθ/(2 +2μ·tanθ), so the initial elastic force of the spring 8 H≥G·tanθ/(2+2μ·tanθ).

During the extrusion process, the initial extrusion force is p. When the aluminum alloy material is extruded to contact with the support plate 6 of the lower die, the extrusion force will gradually increase. At this time, the spring 8 will be slowly compressed. Due to the support The length of the hypotenuse in the cross section of the groove 11 is L, so when the sliding distance of the boss slider 7 is L·cosθ, the boss slider 7 breaks away from the support groove 11, and the compression amount of the spring 8 is Δ+L·cosθ, Since the horizontal distance between the rear end of the stop plate 12 and the rear end of the projection 701 of the boss slider 7 is S=L cosθ, so when the sliding distance of the boss slider 7 is L cosθ, the stop plate 12 is in the stop position. The elastic force of the spring 13 pops up, and the main boss slider 7 is locked to prevent the boss slider 7 from popping up again. At this time, the elastic force of the spring 8 is k (Δ+L cosθ), and the vertical force applied to the lower mold support plate 6 The force is 2·k·(Δ+L·cosθ)(1/tanθ+μ), so when the total extrusion force P>2·k·(Δ+L·cosθ)(1/tanθ+μ+p-G), The lower mold support plate 6 is ejected, the boss slider 7 is stuck, and the micro-aperture multi-channel aluminum alloy pipe material extruded from the aluminum alloy material is successfully formed.

Example 2:

As shown in Figure 2, the inner wall of the lower mold 3 is symmetrically provided with two transverse sliding grooves 10, the lower mold support plate 6 is a cuboid plate; the base 702 is a cuboid base; the sliding groove 10 It is a through-slot for front section cuboid and threaded hole at the end; bolt 16 is arranged in the threaded hole; the end of spring 8 is against the bolt 16; the lower part of the sliding groove 10 is provided with a connected square hole 9, and the lower part of the square hole 9 Set threaded hole; Stop bolt 14 is arranged in described threaded hole, and described stop bolt 14 top connects stop spring 13, and described stop spring 13 top resists ejection block 15; Described slide groove 10 top has Slider slot 17; the horizontal dimension of the slider slot 17 is greater than the horizontal dimension of the base 702 of the boss slider 7, as shown in Figure 7, the front end of the slider slot 17 to the front end of the base 702 The horizontal distance C is equal to the horizontal dimension L·cosθ of the support groove 11; the horizontal distance D between the rear end of the ejector block 15 and the front end of the base 702 is greater than the horizontal dimension L·cosθ of the support groove 11, and other parts of the structure are the same as those in the embodiment 1 is the same.

The working process is: assemble all the components before extrusion. During the extrusion process, when the aluminum alloy material is extruded to contact with the support plate 6 of the lower die, the extrusion force will gradually increase, and at this time the spring 8 will slowly Slowly compressed, since the hypotenuse length of the cross-section of the support groove 11 is L, when the sliding distance of the boss slider 7 is L·cosθ, the boss slider 7 breaks away from the support groove 11, because the front end of the slider clamping groove 17 reaches The horizontal distance C of the front end of the base 702 is equal to the horizontal dimension L·cosθ of the support groove 11, and the horizontal distance D between the rear end of the ejection block 15 and the front end of the base 702 is greater than the horizontal dimension L·cosθ of the support groove 11, so When the sliding distance of the boss slider 7 is L·cosθ, the ejection block 15 pushes the boss slider 7 into the slider slot 17, and the card master boss slider 7 prevents the boss slider 7 from being locked by the spring 8. It is ejected under the elastic force of the lower die, so that the lower die support plate 6 can be ejected smoothly, so as to ensure the continuous extrusion and the quality of the extruded parts; The aluminum alloy pipe is formed smoothly.

The described embodiment is a preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation, without departing from the essential content of the present invention, any obvious improvement-replacement or improvement that those skilled in the art can make Modifications all belong to the protection scope of the present invention.

Claims (10)

1. A pressurized multi-channel pipe material splitting mold combined mold core, is characterized in that, comprises mold core (1), lower mold (3) and lower mold support plate (6); Described mold core (1) is positioned at top , the lower mold (3) is located at the bottom; the center of the lower mold (3) has a lower mold through hole (4); the lower mold support plate (6) is located inside the lower mold through hole (4), the The outer profile of said lower die support plate (6) is identical to the shape and size of the lower die through hole (4), and the thickness of said lower die support plate (6) is less than the thickness of the lower die (3); said mold core ( The bottom of 1) is equipped with a plurality of upper mold core needles (2), and the top of the lower mold support plate (6) is equipped with a plurality of lower mold core needles (5) that cooperate with the upper mold core needles (2); The inner wall of the lower mold (3) is symmetrically provided with two transverse slide grooves (10); the slide groove (10) is horizontally fixed with a spring (8) and a boss slider matched with the slide groove (10) (7); one end of the spring (8) is against the sliding groove (10), and the other end is against the boss slider (7); the boss slider (7) includes a boss (701) and a base (702); the lower mold support plate (6) is provided with a support groove (11) matched with the front end of the boss (701), and the lower mold support plate (6) is supported on the lower mold by the boss (701) Inside the through hole (4); after the front end of the boss (701) is retracted to the sliding groove (10), it can be stuck in the sliding groove (10). 2. A kind of pressurized multi-channel pipe splitter mold core according to claim 1, characterized in that, the front end of the boss (701) is wedge-shaped, and the included angle with the horizontal plane is θ; the boss ( 701) The friction coefficient between the front end and the contact surface of the support groove (11) is μ, the total weight of the lower mold support plate (6) and the lower mold core needle (5) connected to it is G, and the initial compression of the spring (8) The quantity is Δ, and the elastic coefficient of the spring (8) is k, then the following equation should be satisfied: k·Δ≥G·tanθ/(2+2μ·tanθ). 3. A kind of pressurized multi-channel pipe splitter mold core according to claim 2, characterized in that, said lower mold support plate (6) is a cuboid plate; said sliding groove (10) is a cuboid groove The base (702) is a cuboid base; the boss (701) is a wedge block; the bottom of the slide groove (10) has a connected square hole (9), and the square hole (9) A threaded hole is provided at the bottom; a stop bolt (14) is arranged in the threaded hole, the lower end of the stop spring (13) is against the stop bolt (14), and the upper end is against the base (702); the boss ( 701) The horizontal distance between the rear end and the stop plate (12) rear end is equal to the horizontal dimension of the support groove (11). 4. A kind of pressurized multi-channel pipe material splitter mold core according to claim 2, characterized in that, said lower mold support plate (6) is a cuboid plate; said base (702) is a cuboid base seat; the sliding groove (10) is a through groove of a cuboid in the front section and a threaded hole at the end; bolts (16) are set in the threaded holes; the end of the spring (8) is against the bolts (16); the sliding groove (10 ) bottom is provided with a connected square hole (9), and the bottom of the square hole (9) is provided with a threaded hole; a stop bolt (14) is arranged in the threaded hole, and the top of the stop bolt (14) is connected to a stop Spring (13), the upper part of the stop spring (13) is against the ejector block (15); the upper part of the sliding groove (10) is provided with a slider locking groove (17); the slider locking groove (17) The horizontal dimension is greater than the horizontal dimension of the base (702), the horizontal distance from the front end of the slider slot (17) to the front end of the base (702) is equal to the horizontal dimension of the support groove (11); the ejection block (15 ) and the horizontal distance between the rear end of the base (702) and the front end is greater than the horizontal dimension of the support groove (11). 5. A kind of pressurized multi-channel pipe material splitting mold combined mold core according to claim 3 or 4, characterized in that, the upper mold core needle (2) and the mold core (1), the lower mold core Both the needle (5) and the lower die support plate (6) are detachably connected. 6. A kind of pressurized multi-channel pipe material splitting mold combined mold core according to claim 5, characterized in that, the upper mold core needle (2) and the mold core (1), the lower mold core needle (5) and the lower mold support plate (6) are threaded; the end of the upper mold core needle (2) contacting the mold core (1) is tapped with a thread, and the other end is provided with a groove (201); the lower mold One end of the core needle (5) contacting the lower mold support plate (6) is threaded, and the other end is provided with a protrusion (501); the inner contour of the groove (201) and the outer contour of the protrusion (501) The shapes and sizes are the same; the maximum cross-sectional dimensions of the matching ends of the upper core needle (2) and the lower core needle (5) are the same. 7. A pressurized multi-channel pipe splitter mold core according to claim 6, characterized in that the longitudinal section of the front end of the protrusion (501) is trapezoidal. 8. A pressurized multi-channel pipe splitter mold core according to claim 7, characterized in that the shape and size of the front end of the boss (701) is the same as that of the support groove (11). 9. A kind of pressurized multi-channel pipe material splitting mold combined mold core according to claim 2, characterized in that, the upper mold core needle (2) and the lower mold core needle (5) correspond to each other, and respectively in The mold core (1) and the lower mold support plate (6) are equidistantly arranged. 10. The combined mold core of a pressurized multi-channel pipe splitting mold according to claim 2, wherein the cross-sectional shape of the upper mold core needle (2) and the lower mold core needle (5) is a circle Shaped, square or irregular.