Extrusion die for automobile parts with large wall thickness difference

Abstract

The utility model discloses an automobile part extrusion die with large wall thickness difference, which comprises an upper die, a die core connected with the bottom of the shunting bridge, a lower die connected with the bottom of the shunting bridge, and a lower die connected with the bottom of the lower die, a first-stage welding chamber is formed in the top of the lower die, and a second-stage welding chamber is formed in the position, below the first-stage welding chamber, of the lower die. According to the utility model, the two flow choking blocks are arranged at the thin-wall point position of the automobile part, so that the aluminum flow flowing through the thin-wall point position can be guided, a part of the aluminum flow can be separated to flow to the thick-wall point position, and the flow velocity of the aluminum flow is distributed while the flow velocity of the aluminum flow is balanced, so that the flow velocity of the aluminum flow is distributed when the automobile part in the cavity is formed; the flatness of the head and the tail is the same, chromatic aberration does not exist, the smoothness is good, and the performance requirements of automobile parts in use can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to an automobile part extrusion die with large wall thickness difference. BACKGROUND

[0002] In the aluminum extrusion processing industry, aluminum alloy is widely used in the technical fields of building, electric vehicle, ship, aerospace, etc. due to its low density, high strength, good plasticity, excellent extrusion formability, excellent conductivity, thermal conductivity and corrosion resistance, safety and recyclability. Currently, the production of aluminum profiles is usually completed by hot extrusion at high temperature using a die. Different aluminum profiles have corresponding hot extrusion dies to realize the production of different profiles.

[0003] As an aluminum profile with large wall thickness difference, the traditional hot extrusion die cannot reasonably feed the automobile parts according to the wall thickness during production. The feed at the wall thickness is often insufficient, resulting in a difference in the flow rate of the aluminum flow in the cavity, which affects the mechanical properties of the formed automobile part aluminum profile, and needs to be improved.

[0004] Therefore, it is necessary to invent an automobile part extrusion die with large wall thickness difference to solve the above problems. CONTENT OF THE UTILITY MODEL

[0005] (I) Utility model purpose

[0006] To solve the technical problems in the background art, the utility model provides an automobile part extrusion die with large wall thickness difference. Two flow resistance blocks are arranged at the thin wall point of the automobile part, which can guide the aluminum flow passing through this point, so that a part of the aluminum flow can flow to the thin wall point, balance the flow rate of the aluminum flow, and realize the distribution of the flow rate, so that the head and tail flatness of the automobile part in the cavity is the same during forming, there is no color difference, the smoothness is good, and the performance requirements of the automobile part during use can be met.

[0007] (II) Technical scheme

[0008] To achieve the above purpose, the utility model provides the following technical scheme: an automobile part extrusion die with large wall thickness difference, comprising an upper die, a flow distribution bridge arranged inside the upper die, the flow distribution bridge comprising five bridge positions, the upper die being spaced apart from the four flow distribution holes by the five bridge positions;

[0009] a die core connected with the bottom of the flow distribution bridge;

[0010] a lower die arranged at the bottom of the upper die, a primary welding chamber being formed at the top of the lower die, and a secondary welding chamber being formed below the primary welding chamber;

[0011] Two flow resistance blocks are arranged on the bottom wall of the first welding chamber and are located at the front and back sides of the entrance of the second welding chamber;

[0012] The side of the two flow resistance blocks adjacent to the entrance of the second welding chamber is a flat surface, and the other three sides are inclined surfaces with an inclination angle towards the center of the flow resistance blocks, for guiding the aluminum liquid to flow towards the left and right sides of the second welding chamber.

[0013] Preferably, one of the bridge positions is located in the middle of the upper die, and the other four bridge positions are located on the left and right sides of the middle bridge position, and the die core is arranged below the middle bridge position.

[0014] Preferably, a cavity is arranged in the lower die and is connected to the second welding chamber, and the die core can be inserted into the cavity for hot extrusion production of automobile parts.

[0015] Preferably, a discharge port is arranged at the bottom of the lower die and is connected to the cavity, and the discharge port is arranged in a stepped shape for discharging the formed automobile parts.

[0016] Preferably, the depth of the first welding chamber is 4mm, and the depth of the second welding chamber is 5mm.

[0017] Preferably, the upper die and the lower die are made of H13 die steel and are tightly arranged by fasteners.

[0018] Compared with the prior art, the beneficial effects of the above technical scheme of the utility model are:

[0019] The two flow resistance blocks are arranged in the first welding chamber, and the flow resistance blocks are located at the thin wall point of the automobile parts, so that the aluminum liquid flowing through the flow resistance blocks can be dispersed and guided to the thick wall point, i.e. to the left and right sides of the second welding chamber, so that the aluminum liquid supply at the thick wall point is sufficient, the flow rate of the aluminum liquid is balanced, and the distribution of the aluminum liquid at the thick wall point and the thin wall point is realized, at this time, the aluminum liquid supply at each position in the cavity is reasonable, the flow rate is consistent, the head and tail flatness of the automobile parts is the same during molding, there is no color difference, the smoothness is good, and the performance requirements during use of the automobile parts can be met. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the utility model, and other drawings can be obtained by those skilled in the art according to these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a front sectional view of the present invention;

[0023] Figure 3 This is a half-sectional view of the present invention;

[0024] Figure 4 This is a schematic diagram of the upper mold of this utility model;

[0025] Figure 5 This is a side sectional view of the present invention;

[0026] Figure 6 This is a top view of the present invention:

[0027] 1 Upper mold, 2 Diverter bridge, 21 Bridge position, 3 Diverter hole, 4 Mold core, 5 Lower mold, 6 Primary welding chamber, 7 Secondary welding chamber, 8 Flow block, 9 Cavity, 10 Discharge port. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0029] This utility model provides, for example Figures 1-6 The above describes an extrusion die for automotive parts with a large wall thickness difference, including an upper die 1. The upper die 1 has a flow divider bridge 2 inside, and the flow divider bridge 2 includes five bridge positions 21. The upper die 1 is separated into four flow divider holes 3 by the five bridge positions 21.

[0030] The mold core 4 is connected to the bottom of the diversion bridge 2;

[0031] The lower mold 5 is located at the bottom of the upper mold 1. A primary welding chamber 6 is formed at the top of the lower mold 5, and a secondary welding chamber 7 is formed below the primary welding chamber 6 in the lower mold 5.

[0032] Two flow-blocking blocks 8 are provided, which are connected to the bottom wall of the primary welding chamber 6 and are located on the front and rear sides of the entrance of the secondary welding chamber 7, respectively.

[0033] Among them, the two flow-blocking blocks 8 are set as planes on one side adjacent to the inlet of the secondary welding chamber 7, and the other three sides are set as inclined surfaces, with the inclination angles all tilted towards the center of the flow-blocking block 8, so as to guide the aluminum liquid to flow towards the left and right sides of the secondary welding chamber 7.

[0034] In one embodiment, one of the bridge positions 21 is located in the middle of the upper mold 1, and the other four bridge positions 21 are paired up and connected to the left and right sides of the middle bridge position 21 respectively. The mold core 4 is located directly below the middle bridge position 21, so that when the aluminum flow flows out of the diversion hole 3, it can directly rush towards the mold core 4 from all directions, so that the mold core 4 has sufficient material supply and the aluminum flow is stable.

[0035] In one embodiment, the system further includes a cavity 9, which is located inside the lower die 5 and communicates with the secondary welding chamber 7. The die core 4 can be inserted into the cavity 9 for hot extrusion production of automotive parts. The system also includes a discharge port 10, which is located at the bottom of the lower die 5 and communicates with the cavity 9. The discharge port 10 is stepped and is used to discharge the formed automotive parts, ensuring that the outer surface of the formed automotive part aluminum profile is not affected when it is discharged, thus ensuring the integrity of its outer surface.

[0036] In one embodiment, the depth of the primary welding chamber 6 is set to 4 mm, and the depth of the secondary welding chamber 7 is set to 5 mm, so that the aluminum flow can be fully welded and tend to flow more stably, thereby ensuring the molding of automotive parts.

[0037] In one embodiment, both the upper mold 1 and the lower mold 5 are made of H13 mold steel, which gives the mold body high strength and long service life. They are also fastened together with fasteners to form the mold body, making it convenient for workers to use.

[0038] The specific implementation method is as follows: When this utility model is in use, aluminum flows down through the diversion hole 3, passes through the primary welding chamber 6 and the secondary welding chamber 7, and then flows into the cavity 9. Under the joint extrusion of the mold core 4 and the cavity 9, the aluminum profile of the automotive parts is formed and further extruded downwards, and finally discharged through the discharge port 10. The stepped discharge port 10 can ensure that the surface of the formed aluminum profile of the automotive parts is not affected during extrusion, thus ensuring the quality of the finished product.

[0039] Because the aluminum profiles for these automotive parts have significantly different wall thicknesses, Figure 1 For example, the thicker sections are the left and right sides of cavity 9, that is, the two sides where the inlet of the secondary welding chamber 7 does not have the flow-blocking block 8, while the thinner sections are the front and rear sides of cavity 9, that is, the two sides where the inlet of the secondary welding chamber 7 is equipped with the flow-blocking block 8. Therefore, after the aluminum flow enters the upper mold 1, specifically:

[0040] Firstly, the aluminum flow is blocked by five bridge sites 21, divided into four flows through four flow holes 3, and the mold core 4 is arranged below the middle bridge site 21, so that the aluminum flow entering the upper die 1 can directly impact the mold core 4 when flowing out, so that the aluminum flow around the mold core 4 is sufficient, and the installation of the mold core 4 at the bottom of the middle bridge site 21 also makes the aluminum flow around the mold core 4 balanced when impacted by the aluminum flow, has higher stability, and the mold core 4 is not easy to swing, thereby ensuring the stability of the aluminum flow flowing to the mold core 4;

[0041] When the aluminum flow reaches the primary welding chamber 6, the aluminum flow on both sides of the cavity 9 is blocked by the flow block 8 when flowing to the secondary welding chamber 7, and since the flow block 8 has three sides arranged as inclined surfaces, the aluminum flow at the flat surface will continue to flow towards the inside of the secondary welding chamber 7, and the aluminum flow impacting the three inclined surfaces will be dispersed outward, thereby a part of the aluminum flow flows to the left and right sides of the cavity 9, and then flows into the secondary welding chamber 7 and the cavity 9 inside synchronously with the aluminum flow flowing out of the left and right flow holes 3, so that there is more aluminum flow at the wall thickness point of the automobile part, and less aluminum flow at the wall thin point, not only balancing the flow rate of the aluminum flow, but also achieving the distribution of the aluminum flow at the wall thickness point and the wall thin point, thereby making the aluminum flow in the cavity 9 reasonable and uniform during the molding of the automobile part, so that the aluminum flow can flow uniformly and stably through the cavity 9, thereby making the head and tail flatness of the automobile part during molding the same, without color difference, and good smoothness, which can meet the performance requirements of the automobile part in use;

[0042] Further, the flow block 8 can also improve the strength of the lower die 5, so that the lower die 5 has high impact resistance, avoiding the collapse of the lower die 5 by the aluminum flow, reducing the loss of the mold body, and the mold body does not need to be frequently replaced during use, and has a long service life;

[0043] At the same time, the design of the primary welding chamber 6 and the secondary welding chamber 7 improves the flow rate of the aluminum flow towards the cavity 9, improves the welding quality, and better fuses the four aluminum flows when they converge, avoids the accumulation of aluminum liquid at the inlet of the cavity 9, and makes the aluminum liquid flow smoothly towards the inside of the cavity 9, thereby ensuring the molding quality of the automobile part;

[0044] The embodiment specifically solves the problem that the existing hot extrusion die cannot reasonably supply the aluminum flow according to the wall thickness of the automobile part during production, the supply at the wall thickness is often insufficient, the aluminum flow in the cavity 9 has a flow rate difference, the head and tail flatness of the molded automobile part aluminum profile is large, and the mechanical properties are affected, which needs to be improved.

[0045] The above has only described certain exemplary embodiments of the present application by way of illustration, and it is needless to say that the described embodiments can be modified in various ways without departing from the spirit and scope of the present application for those skilled in the art. Therefore, the above drawings and descriptions are illustrative in nature, and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. An extrusion die for automotive parts with significant differences in wall thickness, characterized in that: include: The upper mold (1) has a flow divider bridge (2) inside. The flow divider bridge (2) includes five bridge positions (21). The upper mold (1) is divided into four flow divider holes (3) by the five bridge positions (21). The mold core (4) is connected to the bottom of the diversion bridge (2); The lower mold (5) is located at the bottom of the upper mold (1). A primary welding chamber (6) is provided at the top of the lower mold (5). A secondary welding chamber (7) is provided below the primary welding chamber (6) of the lower mold (5). Two flow-blocking blocks (8) are provided, which are connected to the bottom wall of the first-stage welding chamber (6) and are located on the front and rear sides of the entrance of the second-stage welding chamber (7), respectively. Among them, the two flow-blocking blocks (8) are set as planes on the side adjacent to the inlet of the secondary welding chamber (7), and the other three sides are set as inclined surfaces, and the inclination angle is inclined towards the center of the flow-blocking block (8) to guide the aluminum liquid to flow towards the left and right sides of the secondary welding chamber (7).

2. The extrusion die for automotive parts with significant wall thickness variations according to claim 1, characterized in that: One of the bridge positions (21) is located in the middle of the upper mold (1), and the other four bridge positions (21) are in pairs and connected to the left and right sides of the middle bridge position (21) respectively. The mold core (4) is located directly below the middle bridge position (21).

3. The extrusion die for automotive parts with significant wall thickness variations according to claim 1, characterized in that: It also includes a cavity (9) which is opened inside the lower mold (5) and connected to the secondary welding chamber (7). The mold core (4) can be inserted into the cavity (9) for hot extrusion production of automotive parts.

4. The extrusion die for automotive parts with significant wall thickness variations according to claim 3, characterized in that: It also includes a discharge port (10), which is located at the bottom of the lower mold (5) and connected to the cavity (9). The discharge port (10) is stepped and is used to discharge the molded automotive parts.

5. The extrusion die for automotive parts with significant wall thickness variations according to claim 1, characterized in that: The depth of the primary welding chamber (6) is set to 4 mm, and the depth of the secondary welding chamber (7) is set to 5 mm.

6. The extrusion die for automotive parts with significant wall thickness variations according to claim 1, characterized in that: The upper mold (1) and the lower mold (5) are both made of H13 mold steel and are fastened together to form a mold body.

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