CN112705580A

CN112705580A - Extrusion die of large-scale casing

Info

Publication number: CN112705580A
Application number: CN202011434180.6A
Authority: CN
Inventors: 韩良; 李晓峰; 孙杨; 刘庭
Original assignee: Wuhu Yilian Spinning Technology Co ltd
Current assignee: Wuhu Yilian Spinning Technology Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-04-27

Abstract

The invention aims to provide an extrusion die of a large shell, which is used for carrying out extrusion processing by sequentially adopting a primary extrusion die, a secondary extrusion die and a tertiary extrusion die, wherein a blank is arranged on a first core die and is matched with a first female die cavity for extrusion to obtain a primary extrusion blank with a trapezoidal transition top part, the primary extrusion blank is arranged on a second core die and is matched with a second female die cavity for extrusion to obtain a secondary extrusion blank with a trapezoidal top part, the secondary extrusion blank is arranged on a third core die and is matched with a third female die cavity for extrusion to obtain a third extrusion blank with a trapezoidal upper part and an arc edge, and the third extrusion blank is transferred through a transfer table, so that the extrusion die is adopted for carrying out tertiary extrusion to obtain the large shell meeting the requirements, the material utilization rate is up to 80%, and the production efficiency is improved by more than 20 times.

Description

Extrusion die of large-scale casing

Technical Field

The invention relates to the field of large shell forming, in particular to an extrusion die for a large shell.

Background

The inner diameter of the large shell is D (100-500 mm), the wall thickness is T (8-15 mm), the local thickness of the head of the shell is more than 3-4T, the inner diameter D of the head of the shell is 0.4-0.5D, and the wall thickness of the shell is inconsistent and has larger difference, so the forming difficulty is extremely high. The method of hot extrusion molding effectively solves the problems of local thickening and diameter reduction of the head of the shell, and the existing domestic commonly adopted molding process is to use a solid bar material machine for processing, so that the cost is too high, the production efficiency is too low, and an extrusion molding die is required for processing. Therefore, it is necessary to solve this problem.

Disclosure of Invention

In order to solve the problems, the invention provides an extrusion die of a large shell, which sequentially adopts a primary extrusion die, a secondary extrusion die and a tertiary extrusion die for extrusion processing, wherein a blank is arranged on a first core die and is matched with a first female die cavity for extrusion to obtain a first extrusion blank with a top bulge and a trapezoidal transition section, the first extrusion blank is arranged on a second core die and is matched with a second female die cavity for extrusion to obtain a second extrusion blank with a trapezoidal top section, the second extrusion blank is arranged on a third core die and is matched with a third female die cavity for extrusion to obtain a third extrusion blank with a trapezoidal upper section and an arc edge, through transfer of the transfer table, the large shell meeting the requirements is obtained by extruding the extrusion die for three times, the material utilization rate is up to 80%, the production efficiency is improved by more than 20 times, and the problems in the background art are solved.

The invention aims to provide an extrusion die of a large-scale shell, which comprises a primary extrusion die, a secondary extrusion die and a tertiary extrusion die which are transversely arranged, wherein the primary extrusion die comprises an upper base I, the bottom of the upper base I is provided with a female die cavity I with an opening at the bottom, a lower base I is arranged below the upper base I, the top of the lower base I is provided with a core die I, and the female die cavity I and the core die I are vertically and correspondingly arranged; the secondary extrusion die comprises an upper base II, a female die cavity II with an opening at the bottom is arranged at the bottom of the upper base II, a lower base II is arranged below the upper base II, a core die II is arranged at the top of the lower base II, and the female die cavity II and the core die II are arranged up and down correspondingly; the third-time extrusion die comprises a third upper base, a third female die cavity with an opening at the bottom is formed in the bottom of the third upper base, a third lower base is arranged below the third upper base, a third core die is arranged at the top of the third lower base, and the third female die cavity and the third core die are arranged up and down correspondingly; the section of the top of the first core die is trapezoidal, the middle part in the first female die cavity is a transition part with a trapezoidal section, the lower part of the first female die cavity is large, the upper part of the first female die cavity is small, and the section of the first female die cavity is square; the section of the top of the second core die is trapezoidal, the top end of the second core die is provided with a first bump, the section of the upper part of the second female die cavity is trapezoidal, and the section of the lower part of the second female die cavity is square; the third edge of the core mold is arc-shaped, the cross section of the top of the core mold is trapezoid, the top end of the core mold is provided with a second bump, and the third cross section of the cavity of the female mold is trapezoid and the edge of the cavity of the female mold is arc-shaped.

The further improvement lies in that: and transfer tables are arranged at the lower parts between the primary extrusion die and the secondary extrusion die and between the tertiary extrusion dies of the secondary extrusion die.

The further improvement lies in that: the first core die is provided with a blank, the second core die is provided with a first extrusion blank, and the third core die is provided with a second extrusion blank; the first cavity of the female die and the first core die are matched with the first extruded blank; the cavity II of the female die and the core die II are matched with the blank piece extruded for the second time; and matching the cavity III of the female die and the core die III with the third extruded blank.

The further improvement lies in that: the lower bases of the primary extrusion die, the secondary extrusion die and the tertiary extrusion die are detachable from the core die, and the upper base and the cavity of the female die are detachable.

The invention has the beneficial effects that: the invention carries out extrusion processing by sequentially adopting a primary extrusion die, a secondary extrusion die and a tertiary extrusion die, wherein a blank is arranged on a first core die and is matched with a first female die cavity for extrusion to obtain a first extruded blank with a trapezoidal transition top, the first extruded blank is arranged on a second core die and is matched with the second female die cavity for extrusion to obtain a second extruded blank with a trapezoidal top section, the second extruded blank is arranged on a third core die and is matched with the third female die cavity for extrusion to obtain a third extruded blank with a trapezoidal upper section and an arc edge, and the third extruded blank is transferred by a transfer table, so that the extrusion die is adopted for three times of extrusion to obtain a large shell meeting the requirements, the material utilization rate is up to 80 percent, and the production efficiency is improved by more than 20 times.

Drawings

FIG. 1 is a schematic of the present invention.

Fig. 2 is a schematic view of the variation of the present invention from blank to third extrusion.

Wherein: 1-upper base one, 2-female die cavity one, 3-lower base one, 4-core die one, 5-upper base two, 6-female die cavity two, 7-lower base two, 8-core die two, 9-upper base three, 10-female die cavity three, 11-lower base three, 12-core die three, 13-transition part, 14-lug one, 15-lug two, 16-blank, 17-first extrusion blank, 18-second extrusion blank, 19-third extrusion blank, 20-transfer table.

Detailed Description

For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.

As shown in fig. 1 and 2, the present embodiment provides an extrusion die for a large-sized housing, which includes a primary extrusion die, a secondary extrusion die and a tertiary extrusion die that are transversely arranged, where the primary extrusion die includes an upper base 1, a female die cavity i 2 with an opening at the bottom is arranged at the bottom of the upper base 1, a lower base 3 is arranged below the upper base 1, a core die i 4 is arranged at the top of the lower base i 3, and the female die cavity i 2 and the core die i 4 are arranged in an up-and-down corresponding manner; the secondary extrusion die comprises an upper base II 5, a female die cavity II 6 with an opening at the bottom is arranged at the bottom of the upper base II 5, a lower base II 7 is arranged below the upper base II 5, a core die II 8 is arranged at the top of the lower base II 7, and the female die cavity II 6 and the core die II 8 are arranged up and down correspondingly; the third-time extrusion die comprises an upper base III 9, a female die cavity III 10 with an opening at the bottom is arranged at the bottom of the upper base III 9, a lower base III 11 is arranged below the upper base III 9, a core die III 12 is arranged at the top of the lower base III 11, and the female die cavity III 10 and the core die III 12 are arranged up and down correspondingly; the section of the top of the core die I4 is trapezoidal, the middle part in the female die cavity I2 is a transition part 13 with a trapezoidal section, the lower part of the female die cavity I2 is large, the upper part of the female die cavity is small, and the section of the female die cavity I is square; the section of the top of the core die II 8 is trapezoidal, the top end of the core die II is provided with a first bump 14, the section of the upper part of the female die cavity II 6 is trapezoidal, and the section of the lower part of the female die cavity II is square; the edge of the third core die 12 is arc-shaped, the cross section of the top of the third core die is trapezoid, the top end of the third core die is provided with a second convex block 15, and the cross section of the third female die cavity 10 is trapezoid and the edge of the third female die cavity is arc-shaped.

And a transfer table 20 is arranged at the lower part between the primary extrusion die and the secondary extrusion die and between the tertiary extrusion dies of the secondary extrusion die. The first core die 4 is used for installing a blank, the second core die 8 is used for installing a first extruded blank, and the third core die 12 is used for installing a second extruded blank; the first concave die cavity 2 and the first core die 4 are matched with a first extrusion blank; a female die cavity II 6 and a core die II 8 are matched with the secondary extrusion blank; the female die cavity III 10 and the core die III 12 are matched with the third extrusion blank. The lower bases of the primary extrusion die, the secondary extrusion die and the tertiary extrusion die are detachable from the core die, and the upper base and the cavity of the female die are detachable.

And (3) mounting the blank 16 on a first core die 4, extruding to obtain a first extruded blank 17, mounting the first extruded blank 17 on a second core die 8, heating the first extruded blank 17 to 1200 ℃, extruding to obtain a second extruded blank 18, wherein the outer diameter of the first extruded blank 17 reaches 250mm, the wall thickness is 25mm, and the length reaches 1000 mm. The second extrusion billet 18 is mounted on the mandrel three 12 and the third extrusion is carried out when the second extrusion billet 18 is heated to 1200 c to obtain a third extrusion billet 19. After the third extrusion forming, the original round steel pipe with the blank wall thickness of 25mm is locally thickened to be more than 40mm, and the diameter of the round steel pipe with the original blank wall thickness of 297mm is reduced to 130 mm.

The extrusion processing is carried out by sequentially adopting a primary extrusion die, a secondary extrusion die and a tertiary extrusion die, a blank piece 16 is arranged on a core die I4 and is matched and extruded with a female die cavity I2 to obtain a primary extrusion blank piece 17 with a trapezoidal transition top bulge, the primary extrusion blank piece 17 is arranged on a core die II 8 and is matched and extruded with a female die cavity II 6 to obtain a secondary extrusion blank piece 18 with a trapezoidal top cross section, the secondary extrusion blank piece 18 is arranged on a core die III 12 and is matched and extruded with a female die cavity III 10 to obtain a third extrusion blank piece 19 with a trapezoidal upper cross section and an arc edge, the third extrusion blank piece is transferred through a transfer table 20, the extrusion die is adopted to carry out tertiary extrusion to obtain a large shell meeting the requirements, the material utilization rate is up to 80%, and the production efficiency is improved by more than 20 times.

Claims

1. The utility model provides an extrusion die of large-scale casing, including a extrusion die, secondary extrusion die and the cubic extrusion die that transverse arrangement set up, its characterized in that: the primary extrusion die comprises an upper base I (1), a female die cavity I (2) with an opening at the bottom is arranged at the bottom of the upper base I (1), a lower base I (3) is arranged below the upper base I (1), a core die I (4) is arranged at the top of the lower base I (3), and the female die cavity I (2) and the core die I (4) are arranged in an up-and-down corresponding mode; the secondary extrusion die comprises an upper base II (5), a female die cavity II (6) with an opening at the bottom is arranged at the bottom of the upper base II (5), a lower base II (7) is arranged below the upper base II (5), a core die II (8) is arranged at the top of the lower base II (7), and the female die cavity II (6) and the core die II (8) are arranged in a vertically corresponding manner; the triple extrusion die comprises an upper base III (9), a female die cavity III (10) with an opening at the bottom is arranged at the bottom of the upper base III (9), a lower base III (11) is arranged below the upper base III (9), a core die III (12) is arranged at the top of the lower base III (11), and the female die cavity III (10) and the core die III (12) are arranged up and down correspondingly; the section of the top of the first core die (4) is trapezoidal, the middle part in the first concave die cavity (2) is a transition part (13) with a trapezoidal section, the lower part of the first concave die cavity (2) is large, the upper part of the first concave die cavity is small, and the section of the first concave die cavity is square; the section of the top of the second core die (8) is trapezoidal, a first bump (14) is arranged at the top end of the second core die, the section of the upper part of the second female die cavity (6) is trapezoidal, and the section of the lower part of the second female die cavity is square; the edge of the third core die (12) is arc-shaped, the cross section of the top of the third core die is trapezoid, the top end of the third core die is provided with a second bump (15), and the cross section of the third female die cavity (10) is trapezoid and the edge of the third core die cavity is arc-shaped.

2. The extrusion die for a large shell according to claim 1, wherein: and a transfer table (20) is arranged at the lower part between the primary extrusion die and the secondary extrusion die and between the tertiary extrusion dies of the secondary extrusion die.

3. The extrusion die for a large shell according to claim 1, wherein: the first core die (4) is used for installing a blank, the second core die (8) is used for installing a first extrusion blank, and the third core die (12) is used for installing a second extrusion blank; a first concave die cavity (2) and a first core die (4) are matched with a first extrusion blank; a female die cavity II (6) and a core die II (8) are matched with the blank piece extruded for the second time; and a female die cavity III (10) and a core die III (12) are matched with the third-time extrusion blank.

4. The extrusion die for a large shell according to claim 1, wherein: the lower bases of the primary extrusion die, the secondary extrusion die and the tertiary extrusion die are detachable from the core die, and the upper base and the cavity of the female die are detachable.