A liquid-expanding automobile axle housing blanking die and a blanking method

Abstract

The application discloses a kind of liquid expansion automobile axle housing blanking mould and blanking method, it is related to automobile axle housing manufacturing technical field, comprising: mould frame;Several active telescopic units are uniformly distributed and fixedly installed on mould frame, and the output end of each active telescopic unit is towards the center of mould frame, and is fixedly installed with one control head;When control head moves to limit away from the center of mould frame, all control heads can form a circle with mould frame;Mould frame is located in the middle of lower die plate, and two groups of sliding die sets are arranged on the lower die plate, and the two groups of sliding die sets are mirror image arranged on the both sides of mould frame;The mould provided in the application can effectively solve the cracking problem caused by instability in the middle of pipe blank during expansion, improve the yield;And the mould does not need to be replaced during the two expansion processes of pipe blank, improve production efficiency, reduce cost.

Description

Technical Field

[0001] This invention relates to the field of automotive axle housing manufacturing technology, and in particular to a hydraulic expansion automotive axle housing blanking mold and blanking method. Background Technology

[0002] When performing hydraulic expansion molding on axle housing blanks, defects such as cracking and dead wrinkles are prone to occur during the expansion process because the diameter of the middle part of the blank is much larger than the diameters at both ends. This is especially true for blanks with an original wall thickness of less than 7mm. When the yield strength and wall thickness tolerance of the blank fluctuate significantly, instability in the middle of the blank can easily occur during expansion, leading to cracking. Therefore, two hydraulic expansion molding processes are often required to reduce the probability of cracking. However, existing blanking molds cannot support two hydraulic expansion molding processes, and the only way to achieve two processes is by changing the mold. Hydraulic expansion forming, such as the Chinese invention patent application number 201610308062.8, which describes a key hydraulically inflatable forming mold for large and medium-sized automotive axle housings, can only achieve one-time hydraulic expansion forming. For stepped tube blanks that require secondary hydraulic expansion forming, the mold needs to be changed and the hydraulic expansion process repeated, resulting in low production efficiency. To address this, this invention proposes a hydraulic expansion automotive axle housing blank forming mold and blank forming method, which effectively controls the expansion of the tube blank, avoids instability in the middle of the tube blank and cracking during expansion, improves the yield, and thus reduces production costs. Summary of the Invention

[0003] This invention provides a mold and method for making a liquid-expanded automotive axle housing blank. When using this mold and method, the instability of the tube blank can be effectively controlled during the expansion process, thereby avoiding cracking. It also increases the window range for controlling the internal pressure of water filling in the tube blank, adapting to the fluctuations in yield strength and wall thickness of different batches of tube blanks.

[0004] A hydraulic expansion automobile axle housing blanking mold includes: a mold frame; a plurality of active telescopic units are evenly distributed and fixedly installed on the mold frame, the output end of each active telescopic unit faces the center of the mold frame, and each is fixedly installed with a control head; when the control head moves away from the center of the mold frame to the limit, all the control heads can form a circle together with the mold frame.

[0005] Furthermore, the mold frame includes an upper mold frame and a lower mold frame; the upper mold frame is located directly above the lower mold frame; the number of active telescopic units is even; and an equal number of active telescopic units are fixedly installed on the upper mold frame and the lower mold frame.

[0006] Furthermore, the mold frame is located in the middle of the lower template, and the lower template is provided with two sets of sliding modules, which are located on both sides of the mold frame and are arranged in a mirror image.

[0007] The sliding module includes: a horizontal template; a sealing block and a sliding mold are fixedly installed on the horizontal template; the sealing block is located between the horizontal template and the sliding mold; a sealing insert is provided between the horizontal template and the sealing block; one end of the sealing insert is sealed to the horizontal template, and the other end abuts against the sealing block;

[0008] Both of the sliding molds are slidably connected to the lower template;

[0009] Each of the sealing inserts is sealed to the horizontal template via a sealing gasket.

[0010] Furthermore, two guide plates are fixedly installed on the lower template, and both sliding molds are slidably connected to the corresponding guide plates.

[0011] Furthermore, a second guide plate is fixedly installed on each of the sliding molds, and the sliding molds are slidably connected to the first guide plate through the second guide plate.

[0012] Furthermore, an upper template is fixedly installed on the upper mold frame, and a lower mold frame is fixedly installed on the lower template.

[0013] A method for preparing a hydraulically expanded automotive axle housing blank, using the aforementioned hydraulically expanded axle housing blank preparation mold, includes the following steps:

[0014] S1. Fix the lower template to the platform of the three-way hydraulic press, fix the upper template to the upper slider of the three-way hydraulic press, and fix the two horizontal templates to the sliders at both ends of the three-way hydraulic press respectively;

[0015] S2. The active telescopic unit drives the control head to extend to the maximum position, placing the stepped tube blank I on the control head on the lower mold frame. The upper slider of the three-way hydraulic press moves downward until the upper mold frame and the lower mold frame close. The sliders at both ends of the three-way hydraulic press move inward simultaneously until the two horizontal templates seal the stepped tube blank I.

[0016] S3. Fill the interior of stepped tube blank I with water to a certain pressure P1. The sliders at both ends of the three-way hydraulic press drive the two sets of sliding modules to move inward a certain distance at the same time until the mold is closed. During the movement of the two sets of sliding modules, increase the water filling pressure inside stepped tube blank I. At the same time, control the extension of the control head through the active telescopic unit to obtain stepped tube blank II.

[0017] S4. All active expansion units depressurize, fill the interior of stepped tube blank II with water to a certain pressure P2, and maintain the pressure for a certain time. P2 is greater than P1, thus obtaining stepped tube blank III.

[0018] Furthermore, in step S3, when the two sets of sliding modules move inward to the mold closing state, there is a gap of 1~2mm between each sliding mold end face and the corresponding mold frame end face.

[0019] Furthermore, the pressure .

[0020] Furthermore, in step S3, the extension amount of each control head decreases uniformly as the two sets of sliding modules move inward, until the extension amount of each control head reaches a certain distance and does not form a circle with the mold frame.

[0021] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: the present invention can effectively solve the problem of cracking caused by instability in the middle of the tube blank during the expansion process, thereby improving the yield; and no mold needs to be changed during the two expansion processes of the tube blank, which improves production efficiency and reduces costs. Attached Figure Description

[0022] Figure 1 This is a front sectional view of the entire blanking mold at the end of step S2 of the present invention.

[0023] Figure 2 This is a cross-sectional view showing the positional relationship between the control head and the mold frame at the end of step S2 of the present invention.

[0024] Figure 3 This is a front sectional view of the entire blanking mold at the end of step S3 of the present invention.

[0025] Figure 4 This is a cross-sectional view showing the positional relationship between the control head and the mold frame at the end of step S3 of the present invention.

[0026] Figure 5 This is a front sectional view of the entire blank-making mold at the end of step S4 of the present invention.

[0027] Figure 6 This is a cross-sectional view showing the positional relationship between the control head and the mold frame at the end of step S4 of the present invention.

[0028] Figure 7 This is a schematic diagram of the stepped tube blank I structure of the present invention.

[0029] Figure 8 This is a schematic diagram of the stepped tube blank II structure of the present invention.

[0030] Figure 9 This is a schematic diagram of the stepped tube blank III structure of the present invention.

[0031] Figure 10 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle.

[0032] Reference numerals: Mold frame-1; Active telescopic unit-2; Control head-3; Lower template-4; Horizontal template-5; Sealing insert-6; Sealing pressure block-7; Sliding mold-8; Guide plate No. 1-9; Guide plate No. 2-10; Upper template-11; Sealing gasket-12; Upper mold frame-101; Lower mold frame-102. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In this embodiment, the size of the stepped tube blank I before bulging is the diameter at the middle part. Wall thickness 7mm, such as Figure 7 As shown; the dimensions of the stepped tube blank III after bulging are the central diameter. ,length ,like Figure 9 As shown, the yield strength of the pipe is 350MPa~370MPa.

[0035] Examples, such as Figure 1-6 As shown, a hydraulic expansion automobile axle housing blanking mold includes: a mold frame 1; several active telescopic units 2 are evenly distributed and fixedly installed on the mold frame 1, the output end of each active telescopic unit 2 faces the center of the mold frame 1, and each is fixedly installed with a control head 3; when the control head 3 moves away from the center of the mold frame 1 to its limit, all control heads 3 and the mold frame 1 can form a circle together, such as... Figure 6 As shown; in order to clearly explain this embodiment and achieve good usage results, the active telescopic unit 2 in this embodiment is a hydraulic cylinder;

[0036] The mold frame 1 includes an upper mold frame 101 and a lower mold frame 102; the upper mold frame 101 is located directly above the lower mold frame 102; there are an even number of active telescopic units 2; an equal number of active telescopic units 2 are fixedly installed on the upper mold frame 101 and the lower mold frame 102; in this embodiment, there are six telescopic units 2, which are evenly distributed on the mold frame 1 composed of the upper mold frame 101 and the lower mold frame 102, and each of the upper mold frame 101 and the lower mold frame 102 is provided with three active telescopic units 2;

[0037] The control head 3 is arc-shaped towards the center of the mold frame 1, so that when the active telescopic unit 2 drives the control head 3 to move to a certain position, it can form a circle together with the upper mold frame 101 and the lower mold frame 102; each active telescopic unit 2 is controlled by a hydraulic station in the factory area.

[0038] Specifically, the mold frame 1 is located in the middle of the lower template 4, and the lower template 4 is provided with two sets of sliding modules. The two sets of sliding modules are located on both sides of the mold frame 1 and are arranged in a mirror image.

[0039] The sliding module includes: a horizontal template 5; a sealing block 7 and a sliding mold 8 are fixedly installed on the horizontal template 5; the sealing block 7 is located between the horizontal template 5 and the sliding mold 8; a sealing insert 6 is provided between the horizontal template 5 and the sealing block 7; one end of the sealing insert 6 is sealed to the horizontal template 5, and the other end abuts against the sealing block 7;

[0040] Both sliding molds 8 are slidably connected to the lower mold plate 4; the sealing insert 6 has a through hole at its center, and the horizontal mold plate 5 has a channel; when water is injected into the stepped tube blank I, the water enters the stepped tube blank I from the end of the tube blank I through the channel on the horizontal mold plate 5 and the through hole at the center of the sealing insert 6, such as... Figure 1 As shown.

[0041] Each sealing insert 6 is sealed to the horizontal template 5 via a sealing gasket 12, such as Figure 10 As shown;

[0042] Two guide plates 9 are fixedly installed on the lower template 4, and the two sliding molds 8 are slidably connected to the corresponding guide plates 9; the guide plates 9 are detachably fixed to the lower template 4 by bolts.

[0043] Each sliding mold 8 is fixedly installed with a second guide plate 10, and the sliding mold 8 is slidably connected to the first guide plate 9 through the second guide plate 10; the second guide plate 10 is detachably fixed to the sliding mold 8 by bolts; in this embodiment, the first guide plate 9 and the second guide plate 10 are both made of copper, thereby reducing the friction when the sliding module slides on the lower template 4.

[0044] An upper template 11 is fixedly installed on the upper mold frame 101, and a lower mold frame 102 is fixedly installed on the lower template 4.

[0045] Engineering practice shows that when the length of the expansion deformation zone in the middle of the stepped tube blank III is no more than 355mm, the yield of the blank produced by the traditional one-time expansion forming method can reach over 98%. However, when the length of the expansion deformation zone in the middle of the stepped tube blank III is greater than 419mm, the yield of the blank produced by the traditional one-time expansion forming method is very low. The main reason is that the long deformation zone in the middle of the tube blank is prone to instability and cracking during expansion forming. Although the yield of the blank produced by the two-time expansion forming method is improved, the total expansion amount is too small, that is, the expansion amount of the second expansion is small, which does not make full use of the equipment. Moreover, it adds an expansion forming process, resulting in low production efficiency and high cost. The liquid expansion automobile axle shell blanking method proposed in this invention can form a blank in one step, which improves the yield when the length of the expansion deformation zone in the middle of the stepped tube blank III is greater than 419mm. The specific steps are as follows:

[0046] S1. Fix the lower template 4 to the platform of the three-way hydraulic press, fix the upper template 11 to the upper slider of the three-way hydraulic press, and fix the two horizontal templates 5 to the sliders at both ends of the three-way hydraulic press respectively;

[0047] S2. The active telescopic unit 2 drives the control head 3 to extend to its maximum position, placing the stepped tube blank I onto the control head 3 on the lower mold holder 102. The upper slider of the three-way hydraulic press moves downward until the upper mold holder 101 and the lower mold holder 102 close. At this time, the stepped tube blank I is vertically clamped by the control head 3 on the upper mold holder 101 and the lower mold holder 102. The sliders at both ends of the three-way hydraulic press move inward simultaneously until the two horizontal templates 5 seal the stepped tube blank I. Figure 1 As shown; at this time, the sealing insert 6 is pressed into a 2-4mm chamfer on the end of the stepped tube blank I, and there is a 1-3mm gap between the inner wall of the conical surface of the sliding mold 8 and the outer wall of the conical surface of the stepped tube blank I. Therefore, the length of the stepped tube blank I should be taken as an appropriate value. In this embodiment, the length of the stepped tube blank I is taken as L1. ;

[0048] S3. Fill the interior of stepped tube blank I with water to a certain pressure P1. In this embodiment The sliders at both ends of the three-way hydraulic press drive the two sets of sliding modules to move inward a certain distance simultaneously until there is a gap of 1~2mm between the end face of each sliding module 8 and the end face of the corresponding mold frame 1. The single-sided advance of the sliding module is 48mm. During the movement of the two sets of sliding modules, the water filling pressure inside the stepped tube blank I is increased, causing the middle of the stepped tube blank I to expand. At the same time, the extension of the control head 3 is controlled by the active telescopic unit 2.

[0049] During this process, the total extension of control head 3 decreases by 24mm, and for every 1mm advancement of the sliding module, the extension of control head 3 decreases by 0.5mm, resulting in a central diameter of... The stepped tube blank II has a concave center, resulting in an approximate saddle shape, such as... Figure 8 As shown;

[0050] S4. All active expansion units 2 depressurize, fill the interior of the stepped tube blank II with water to a certain pressure P2, and maintain the pressure for a certain time. P2 is greater than P1. In this embodiment... This causes the recesses in the stepped tube blank II to be ejected, and the outer side of the stepped tube blank II fits into the circle formed by the control head 3 and the mold frame 1, thus obtaining a tube blank with a central diameter of [missing information]. Stepped tube blank III, such as Figure 9 As shown.

Claims

1. A method for preparing a hydraulically expanded automotive axle housing blank, using a hydraulically expanded axle housing blank preparation mold, characterized in that, The liquid expansion bridge shell blanking mold includes: a mold frame (1); a plurality of active telescopic units (2) are evenly distributed and fixedly installed on the mold frame (1), the output end of each active telescopic unit (2) faces the center of the mold frame (1), and each is fixedly installed with a control head (3); when the control head (3) moves away from the center of the mold frame (1) to the limit, all the control heads (3) can form a circle together with the mold frame (1); The mold frame (1) includes an upper mold frame (101) and a lower mold frame (102); the upper mold frame (101) is located directly above the lower mold frame (102); the number of active telescopic units (2) is even; an equal number of active telescopic units (2) are fixedly installed on the upper mold frame (101) and the lower mold frame (102). The mold frame (1) is located in the middle of the lower template (4). The lower template (4) is provided with two sets of sliding modules. The two sets of sliding modules are located on both sides of the mold frame (1) and are arranged in a mirror image. The sliding module includes: a horizontal template (5); a sealing block (7) and a sliding mold (8) are fixedly installed on the horizontal template (5); the sealing block (7) is located between the horizontal template (5) and the sliding mold (8); a sealing insert (6) is provided between the horizontal template (5) and the sealing block (7); one end of the sealing insert (6) is sealed to the horizontal template (5), and the other end abuts against the sealing block (7); Both of the sliding molds (8) are slidably connected to the lower mold plate (4); Each of the sealing inserts (6) is sealed to the horizontal template (5) by a sealing gasket (12); An upper template (11) is fixedly installed on the upper mold frame (101), and a lower mold frame (102) is fixedly installed on the lower template (4); The method for preparing a hydraulically expanded automotive axle housing includes the following steps: S1. Fix the lower template (4) to the platform of the three-way hydraulic press, fix the upper template (11) to the upper slider of the three-way hydraulic press, and fix the two horizontal templates (5) to the sliders at both ends of the three-way hydraulic press respectively; S2. The active telescopic unit (2) drives the control head (3) to extend to the maximum position, placing the stepped tube blank I on the control head (3) on the lower mold frame (102). The upper slider of the three-way hydraulic press moves downward until the upper mold frame (101) and the lower mold frame (102) close. The sliders at both ends of the three-way hydraulic press move inward simultaneously until the two horizontal templates (5) seal the stepped tube blank I respectively. S3. Fill the interior of the stepped tube blank I with water to a certain pressure P1. The sliders at both ends of the three-way hydraulic press drive the two sets of sliding modules to move inward a certain distance at the same time until the mold is closed. During the movement of the two sets of sliding modules, increase the water filling pressure inside the stepped tube blank I. At the same time, control the extension of the control head (3) through the active telescopic unit (2) to obtain the stepped tube blank II. A depression is formed in the middle of the stepped tube blank II. S4. All active expansion units (2) depressurize, fill the interior of stepped tube blank II with water to a certain pressure P2, and maintain the pressure for a certain time. P2 is greater than P1, and stepped tube blank III is obtained. In step S3, when the two sets of sliding modules move inward to the mold closing state, there is a gap of 1~2mm between the end face of each sliding mold (8) and the end face of the corresponding mold frame (1); The pressure ; In step S3, the extension of each control head (3) decreases uniformly as the two sets of sliding modules move inward until the extension of each control head (3) reaches a certain distance and does not form a circle with the mold frame (1).

2. The method for preparing a hydraulically expanded automotive axle housing according to claim 1, characterized in that, Two guide plates (9) are fixedly installed on the lower template (4), and the two sliding molds (8) are slidably connected to the corresponding guide plates (9).

3. The method for preparing a hydraulically expanded automotive axle housing according to claim 2, characterized in that, Each of the sliding molds (8) is fixedly installed with a second guide plate (10), and the sliding molds (8) are slidably connected to the first guide plate (9) through the second guide plate (10).

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