阅读说明：本技术 一种用于半空心型材的挤压方法及其滑轨悬挂式模具 (Extrusion method for semi-hollow section and slide rail suspension type die thereof ) 是由 邓汝荣 林雅芳 周楚豪 陈嘉敏 唐咏霖 郧鹏 于 2021-08-09 设计创作，主要内容包括：本发明公开了一种用于半空心型材的挤压方法及其滑轨悬挂式模具,该模具在下模的悬臂处向上一体延伸有导轨模芯；在上模的分流桥下面至少1mm处对应设置有适配导轨模芯卡入的滑槽,滑槽位于分流桥的中心位置处,且滑槽的走向与分流桥的走向一致；模具组装之后的上模滑槽下端开口处的底端面到下模止口面的距离h3大于6mm；由于采用了滑轨悬挂式架构,改变了悬臂的承载结构,结合分流桥使悬臂不直接承受挤压,大大提高了模具整体强度,明显延长了模具使用寿命,且挤压成型稳定,挤压出的产品精度高,以及大大简化了模具加工过程,极大降低了成本,适应范围广,可用于所有半空心型材。(The invention discloses an extrusion method for a semi-hollow section and a slide rail suspension type mould thereof, wherein a guide rail mould core is integrally extended upwards at a cantilever of a lower mould of the mould; at least 1mm below the shunting bridge of the upper die is correspondingly provided with a sliding chute matched with the guide rail die core to be clamped in, the sliding chute is positioned at the central position of the shunting bridge, and the direction of the sliding chute is consistent with the direction of the shunting bridge; the distance h3 from the bottom end surface of the opening at the lower end of the upper die sliding groove to the lower die spigot surface after the die is assembled is more than 6 mm; the sliding rail suspension type framework is adopted, the bearing structure of the cantilever is changed, the cantilever is not directly extruded by combining the shunt bridge, the overall strength of the die is greatly improved, the service life of the die is obviously prolonged, the extrusion forming is stable, the precision of the extruded product is high, the die processing process is greatly simplified, the cost is greatly reduced, the application range is wide, and the semi-hollow profile extrusion die can be used for all semi-hollow profiles.)

1. The utility model provides a slide rail suspension type mould for half hollow section bar, includes mould and lower mould, its characterized in that: a guide rail mold core extends upwards integrally at the cantilever of the lower mold; at least 1mm below the shunting bridge of the upper die is correspondingly provided with a sliding chute matched with the guide rail die core to be clamped in, the sliding chute is positioned at the central position of the shunting bridge, and the direction of the sliding chute is consistent with the direction of the shunting bridge; and the distance h3 from the bottom end surface of the lower end opening of the upper die sliding groove to the lower die stop surface after the die is assembled is more than 6 mm.

2. The slide rail suspension type mold for the semi-hollow profile according to claim 1, wherein: the upper die is provided with a straight-through upper die pin hole, the lower die is provided with a stepped lower die pin hole, and the diameter of the lower die pin hole close to one side of the spigot surface is larger.

3. The slide rail suspension type mold for the semi-hollow profile according to claim 1, wherein: the cross sections of the guide rail mold core and the sliding groove are in a T shape, and after the mold is assembled, gaps are reserved between the top surface, the two step surfaces and the four side surfaces of the guide rail mold core and the inner top surface, the two step surfaces and the four side surfaces of the sliding groove respectively.

4. The slide rail suspension mold for the semi-hollow profile according to claim 3, characterized in that: and the clearance value between the two step surfaces of the guide rail mold core and the two step surfaces of the sliding groove is 0.05-0.1 mm.

5. The slide rail suspension mold for the semi-hollow profile according to claim 3, characterized in that: the clearance values between the four side surfaces of the guide rail mold core and the four side surfaces of the sliding chute are the same, and the clearance value between the top surface of the guide rail mold core and the inner top surface of the sliding chute is twice of the clearance value between the four side surfaces of the guide rail mold core and the four side surfaces of the sliding chute.

6. The slide rail suspension mold for the semi-hollow profile according to claim 3, characterized in that: one end of the guide rail core mold is 3mm away from the head of the cantilever, and the other end of the guide rail core mold is more than 3mm away from the root of the cantilever; the width of the head part of the guide rail mold core is B2 = B- (2-6) mm, B is the width of a cantilever, the width of the root part of the guide rail mold core is B1 = B2- (1-4) mm, and B1 is more than 2 mm; the height h of the root of the guide rail mold core is more than h1 + h3, h1 is the distance from the step surface of the upper mold sliding groove to the bottom end surface of the opening at the lower end of the upper mold sliding groove, and the distance h3 from the bottom end surface of the opening at the lower end of the upper mold sliding groove to the stop surface of the lower mold after the mold is assembled is more than 6 mm; the head height h2 of the guide rail mold core is more than 6 mm.

7. The slide rail suspension mold for the semi-hollow profile according to claim 6, characterized in that: and two ends of the guide rail mold core are provided with 1.5mm chamfer angles of 60 degrees.

8. The slide rail suspension mold for the semi-hollow profile according to claim 6, characterized in that: the distance h1 from the step surface of the upper die sliding groove to the bottom end surface of the lower end opening is more than 8 mm.

9. The slide rail suspension mold for the semi-hollow profile of claim 8, wherein: and two sides of the sliding groove are provided with chamfers of 5mm multiplied by 90 degrees.

10. An extrusion method for a semi-hollow profile, characterized in that: extruding a semi-hollow profile using a slide suspended die for a semi-hollow profile according to any one of claims 1 to 9.

Technical Field

The invention relates to the field of extrusion process and die of semi-hollow section, in particular to an extrusion method for semi-hollow section and a slide rail suspension type die thereof.

Background

In aluminum profile products with various types and specifications, a certain part of the aluminum profile products is a semi-hollow profile with a long cantilever and a large tongue ratio, which is quite common in practice, however, the common problems of the semi-hollow profile in extrusion production are that the on-machine success rate of the die is low and the die strength is obviously insufficient, and the cantilever part of the die is extremely easy to collapse and break, so that the die is prematurely scrapped, and the die cannot achieve the normal service life.

The semi-hollow section is a solid (i.e. non-hollow) section on the aspect of section shape characteristics, is calculated and judged by a tongue ratio calculation and judgment method in the industry or on a textbook, and is judged as the semi-hollow section when the tongue ratio is larger than a certain value; for example, the aluminum profile shown in fig. 1 is a semi-hollow profile.

The traditional solid section is produced by using a plane die, and practice shows that the semi-hollow section is extruded by using the plane die, the cantilever part of the semi-hollow section is very easy to collapse and break in the extrusion process, so that the die is scrapped too early, and the die cannot achieve the normal service life; at present, enterprises mainly improve the service life of the semi-hollow section mould by adopting two modes of high-quality steel and increasing the thickness of the mould, but the cost of the mould is higher.

Therefore, the extrusion die for the semi-hollow profile in the prior art has low overall strength and short service life, while the extrusion method for the semi-hollow profile in the prior art has unstable extrusion forming and low precision of the extruded product.

Disclosure of Invention

In order to solve the technical problems, the invention provides the slide rail suspension type die for the semi-hollow section, which is high in overall strength and long in service life.

Meanwhile, the invention also provides an extrusion method for the semi-hollow section, the extrusion forming is stable, and the precision of the extruded product is high.

The technical scheme of the invention is as follows: a slide rail suspension type mould for a semi-hollow section comprises an upper mould and a lower mould, wherein a guide rail mould core is integrally extended upwards at a cantilever of the lower mould; at least 1mm below the shunting bridge of the upper die is correspondingly provided with a sliding chute matched with the guide rail die core to be clamped in, the sliding chute is positioned at the central position of the shunting bridge, and the direction of the sliding chute is consistent with the direction of the shunting bridge; and the distance h3 from the bottom end surface of the lower end opening of the upper die sliding groove to the lower die stop surface after the die is assembled is more than 6 mm.

A slide rail suspension type mould for half hollow section bar, wherein: the upper die is provided with a straight-through upper die pin hole, the lower die is provided with a stepped lower die pin hole, and the diameter of the lower die pin hole close to one side of the spigot surface is larger.

A slide rail suspension type mould for half hollow section bar, wherein: the cross sections of the guide rail mold core and the sliding groove are in a T shape, and after the mold is assembled, gaps are reserved between the top surface, the two step surfaces and the four side surfaces of the guide rail mold core and the inner top surface, the two step surfaces and the four side surfaces of the sliding groove respectively.

A slide rail suspension type mould for half hollow section bar, wherein: and the clearance value between the two step surfaces of the guide rail mold core and the two step surfaces of the sliding groove is 0.05-0.1 mm.

A slide rail suspension type mould for half hollow section bar, wherein: the clearance values between the four side surfaces of the guide rail mold core and the four side surfaces of the sliding chute are the same, and the clearance value between the top surface of the guide rail mold core and the inner top surface of the sliding chute is twice of the clearance value between the four side surfaces of the guide rail mold core and the four side surfaces of the sliding chute.

A slide rail suspension type mould for half hollow section bar, wherein: one end of the guide rail core mold is 3mm away from the head of the cantilever, and the other end of the guide rail core mold is more than 3mm away from the root of the cantilever; the width of the head part of the guide rail mold core is B2 = B- (2-6) mm, B is the width of a cantilever, the width of the root part of the guide rail mold core is B1 = B2- (1-4) mm, and B1 is more than 2 mm; the height h of the root of the guide rail mold core is more than h1 + h3, h1 is the distance from the step surface of the upper mold sliding groove to the bottom end surface of the opening at the lower end of the upper mold sliding groove, and the distance h3 from the bottom end surface of the opening at the lower end of the upper mold sliding groove to the stop surface of the lower mold after the mold is assembled is more than 6 mm; the head height h2 of the guide rail mold core is more than 6 mm.

A slide rail suspension type mould for half hollow section bar, wherein: and two ends of the guide rail mold core are provided with 1.5mm chamfer angles of 60 degrees.

A slide rail suspension type mould for half hollow section bar, wherein: the distance h1 from the step surface of the upper die sliding groove to the bottom end surface of the lower end opening is more than 8 mm.

A slide rail suspension type mould for half hollow section bar, wherein: and two sides of the sliding groove are provided with chamfers of 5mm multiplied by 90 degrees.

An extrusion method for a semi-hollow section, which is used for extruding the semi-hollow section by using the slide rail suspension type mould for the semi-hollow section.

The extrusion method for the semi-hollow section and the slide rail suspension type die thereof provided by the invention have the advantages that the slide rail suspension type framework is adopted, the bearing structure of the cantilever is changed, the cantilever is not directly subjected to extrusion by combining with the shunt bridge, the integral strength of the die is greatly improved, the service life of the die is obviously prolonged, the extrusion forming is stable, the precision of an extruded product is high, the processing process of the die is greatly simplified, the cost is greatly reduced, the application range is wide, and the slide rail suspension type die can be used for all semi-hollow sections.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way; the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for aiding the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention; those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.

FIG. 1 is an enlarged schematic view of a cross-sectional structure of a semi-hollow section in the prior art;

FIG. 2 is a schematic view of a longitudinal cross-sectional structural assembly of an embodiment of the slide rail suspended die for a semi-hollow profile of the present invention;

FIG. 3 is an enlarged schematic view of the mating structure at the mold core of FIG. 2;

FIG. 4 is a schematic structural plan view of a lower mold used in an embodiment of the slide rail suspension type mold for the semi-hollow profile according to the present invention;

FIG. 5 is a schematic longitudinal cross-sectional structural view of FIG. 4;

FIG. 6 is a schematic view of the top view of the slide rail suspended mold for the semi-hollow section according to the embodiment of the present invention;

FIG. 7 is a schematic longitudinal cross-sectional structural view of FIG. 6;

the various reference numbers in the figures are summarized: the die comprises an upper die 100, a shunt bridge 110, a chute 120, an upper die pin hole 130, a lower die 200, a cantilever 210, a guide rail die core 220, a lower die pin hole 230 and a positioning pin 300.

Detailed Description

The embodiments and examples of the present invention will be described in detail below with reference to the accompanying drawings, and the described embodiments are only for the purpose of illustrating the present invention and are not intended to limit the embodiments of the present invention.

Taking the semi-hollow section bar in fig. 1 as an example, referring to fig. 2, fig. 2 is a schematic view of a longitudinal cross-sectional structure assembly of an embodiment of the slide rail suspension mold for the semi-hollow section bar of the present invention, and fig. 2 is a schematic view of a longitudinal cross-sectional structure assembly of the slide rail suspension mold for the semi-hollow section bar of the present invention, the present invention provides a slide rail suspension mold for the semi-hollow section bar, which includes an upper mold 100 and a lower mold 200, wherein a guide rail mold core 220 integrally extends upward at a cantilever 210 of the lower mold 200, a chute 120 adapted to the guide rail mold core 220 is correspondingly disposed at least 1mm below a shunt bridge 110 of the upper mold 100, and a distance h3 from a bottom end surface at a lower end opening of the chute 120 of the upper mold 100 to a stop surface of the lower mold 200 (i.e., a mold hole feeding end top surface of the lower mold 200) after the mold is assembled is greater than 6 mm.

Aiming at the technical problems of the extrusion die for the semi-hollow section in the prior art, the invention provides the split-flow die for extruding the hollow section for extruding the semi-hollow section, which has the characteristics of high strength and stable extrusion; secondly, a slide rail suspension type framework is adopted, but different from the traditional shunting die structure, the slide rail suspension type aluminum profile shunting extrusion die of the invention does not have a die core in the true traditional sense, and does not have the matching of the die core and a die hole, but 1 false die core (namely a guide rail die core 220) protruding upwards is designed at a cantilever 210 on the lower die 200 of the shunting extrusion die, the false die core is similar to a guide rail on a railway and extends to the lower part of a shunting bridge 110 of an upper die 100, meanwhile, 1 sliding groove 120 is designed on the upper die 100 of the shunting extrusion die, and after the guide rail of the false die core is inserted into the sliding groove 120, the cantilever 210 can be suspended on the shunting bridge 110 of the upper die 100 like a suspension bridge, so the slide rail suspension type framework is called.

The advantages of such a design are the following three:

firstly, the shunt bridge 110 can cover and protect the cantilever 210, and the cantilever 210 cannot directly bear the extrusion effect in the extrusion process, so that the bearing capacity of the cantilever 210 can be greatly reduced;

secondly, the hanging mode can change the bearing structure of the cantilever, so that the stress condition of the cantilever 210 is changed from a cantilever beam with one end fixed to a simply supported beam with one end fixedly connected and the other end hinged, thereby greatly improving the integral strength of the die and further obviously prolonging the service life of the die;

thirdly, the processing process of the die can be simplified, and the processing difficulty is reduced.

Preferably, the upper die 100 is provided with a straight-through upper die pin hole 130, the lower die 200 is provided with a stepped lower die pin hole 230, and the lower die pin hole 230 has a larger diameter on the side near the spigot surface for loading the positioning pin 300 from the upper die pin hole 130 when assembling the die, and for ejecting the positioning pin 300 from the lower die pin hole 230 by using a common tool such as an ejector pin when disassembling the die, thereby facilitating the disassembly and maintenance of the die, which is different from the conventional manner of loading the positioning pin from the lower die.

Referring to fig. 3, fig. 3 is an enlarged schematic view of the matching structure at the mold core of fig. 2, preferably, the cross sections of the guide rail mold core 220 and the chute 120 are T-shaped, and after the mold is assembled, gaps are respectively reserved between the top surface, two step surfaces and four side surfaces of the guide rail mold core 220 and the inner top surface, two step surfaces and four side surfaces of the chute 120; the values of gaps between the four side surfaces of the guide rail mold core 220 and the four side surfaces of the sliding chute 120 are the same, the value of the gap (for example, 1mm) between the top surface of the guide rail mold core 220 and the inner top surface of the sliding chute 120 is twice of the value of the gap (for example, 0.5mm) between the four side surfaces of the guide rail mold core 220 and the four side surfaces of the sliding chute 120, and the values of the gaps between the two step surfaces of the guide rail mold core 220 and the two step surfaces of the sliding chute 120 are 0.05-0.1 mm respectively; in these fit clearances, the key is to ensure the clearance (i.e., 0.05-0.1 mm) between the upper mold 100 runner 120 and the lower 200 guide rail mold core 220 at the bottom.

Referring to fig. 3, 4 and 5, fig. 4 is a schematic top view of a lower mold of an embodiment of the invention for a slide rail suspension mold for a semi-hollow profile, and fig. 5 is a schematic longitudinal sectional view of fig. 4; for the lower die 200, the main design parameters of the T-shaped guide rail mold core 220 include:

(1) the length L1 of the guide rail core mold 220 depends on the length L of the cantilever 210, preferably, one end of the guide rail core mold 220 is 3mm away from the head of the cantilever 210, and the other end of the guide rail core mold 220 can be more than 3mm away from the root of the cantilever 210 (i.e. the opening of the semi-hollow profile), i.e. L-L1-3mm > 3 mm;

(2) the head width B2 of the guide rail mold core 220 depends on the width B of the cantilever 210, B2 = B- (2-6) mm, the root width B1 = B2- (1-4) mm of the guide rail mold core 220, and B1 > 2 mm;

(3) the height h of the root of the guide rail mold core 220 depends on the distance h1 from the step surface of the chute 120 of the upper mold 100 to the bottom end surface of the lower end opening of the chute 120 of the upper mold 100 and the distance h3 from the bottom end surface of the lower end opening of the chute 120 of the upper mold 100 to the stop surface of the lower mold 200 after the mold is assembled, namely h is more than h1 + h3, and h3 is more than 6 mm; the head height h2 of the guide rail mold core 220 is more than 6 mm.

Preferably, both ends of the guide rail mold core 220 are provided with chamfers of 1.5mm × 60 ° so as to be smoothly inserted into the slide groove 120 of the upper mold 100 when the mold is assembled.

Referring to fig. 3, fig. 6 and fig. 7, fig. 6 is a schematic bottom view of an upper mold of an embodiment of the invention for a slide rail suspension mold for a semi-hollow profile, and fig. 7 is a schematic longitudinal sectional view of fig. 6; for the upper mold 100, the main design parameters of the T-shaped chute 120 include:

1) the chute 120 is located at the center of the shunting bridge 110, the direction of the chute 120 is consistent with the direction of the shunting bridge 110, the width of the shunting bridge 110 is generally 24mm, the length L2 = L1 + (2-4) mm of the chute 120, and L1 is the length of the guide rail mold core 220 in fig. 4;

2) the distance h1 from the step surface of the chute 120 to the bottom end surface of the lower end opening is more than 8 mm;

3) the minimum distance from the inner top surface of the chute 120 to the lower end of the distribution bridge 110 is greater than 1 mm.

Preferably, the two sides of the sliding groove 120 are provided with chamfers of 5mm × 90 ° to facilitate the rapid flow of metal during the extrusion process and reduce the generation of eddy currents.

Based on the slide rail suspension type die for the semi-hollow profile, the invention also provides an extrusion method for the semi-hollow profile, the semi-hollow profile is extruded by using the slide rail suspension type die for the semi-hollow profile in any one of the embodiments, the extrusion forming is stable, and the extruded product has high precision.

Those not described in detail in this specification are well within the skill of those in the art.

It should be understood that the above-mentioned embodiments are merely preferred examples of the present invention, and not restrictive, but rather, all the changes, substitutions, alterations and modifications that come within the spirit and scope of the invention as described above may be made by those skilled in the art, and all the changes, substitutions, alterations and modifications that fall within the scope of the appended claims should be construed as being included in the present invention.