Die for bending multiple U-shaped swing bending of automobile electric drive rear axle load sensing valve support at one time

Abstract

The utility model discloses an automobile electric drive rear axle load sensing valve support bending multiple U-shaped swing bending die at a time, which comprises a die upper structure and a die lower structure, the die upper structure comprises a die handle, an upper die plate, a guide sleeve, an upper backing plate, an upper fixing plate, an unloading spring, a bending upper die and a knockout block; the die lower structure comprises a positioning plate, a lower fixing plate, a guide column, a rotating shaft, a bending lower die backup plate, a rotating bending lower die, a lower base plate, a lower die plate, an ejector rod, a rotating shaft pressing plate and a gasket. The lower part of the die is rotatable, the bending lower die backup plate and other structures are additionally arranged, the traditional three procedures (namely, bending 1, bending 2 and shaping) are optimized into one procedure, so that the production efficiency is improved by 3.3 times, the service life of the die is prolonged by 2.7 times, the swing type bending process is adopted, the appearance quality of products is improved (namely, bending drawing marks of the products are very shallow), and the production cost is reduced. The production cost is reduced, and the product quality is stable.

Description

Technical Field

[0001] The present application belongs to the field of mechanical equipment, and relates to a manufacturing mold for a load-sensing valve bracket, and in particular to a U-shaped swing bending mold for bending a plurality of load-sensing valve brackets of an electric drive rear axle of an automobile at one time. Background Art

[0002] The load-sensing valve bracket of the electric drive rear axle of the automobile is welded to the bridge housing of the automobile drive axle. Its main function is to fasten and install the automobile load-sensing proportional valve and control the installation position of the load-sensing proportional valve to achieve braking effect control of the vehicle while driving and ensure the stability and comfort of the vehicle during driving. Therefore, the bending opening size requirements of the load-sensing valve bracket are relatively high. The traditional production method for load-sensing valve brackets is to process them in five steps, with the following process flow: blanking → blanking → bending 1 → bending 2 → shaping (i.e., first bending a small U-shape, then bending a large U-shape. If two U-shapes are bent at the same time in one process, the product strip will interfere with the arc of the corner points of the upper bending die during the bending process, and the arc of the product bending corner is R1, which will increase the bending friction and make it difficult for the sheet to flow, resulting in quality defects such as deep bending marks or thinning of the sheet at the corners and cracking. In addition, due to the traditional fixed bending die structure, the product has a large rebound after bending, and the opening size of the product after bending is difficult to guarantee. Finally, a shaping process is added to adjust the bending openings) to meet the product design requirements. This not only requires the installation of a large number of molds, which takes a long time to produce, but also requires multiple material distributions between multiple devices, resulting in low production efficiency. The utility model is based on the optimizability of the production process in the existing technology, and designs a U-shaped swing bending mold that bends multiple U-shaped swing bending molds at a time, optimizes three working procedures (i.e., bending 1, bending 2, and shaping) into one working procedure, and the tensile marks on the product after bending are very shallow. Therefore, it is very necessary to improve product quality and production efficiency by designing a U-shaped swing bending mold that can meet the production of automobile electric drive rear axle load-sensing valve brackets and bend multiple U-shaped swing bending molds at a time. Utility Model Content

[0003] One of the objectives of this utility model is to provide a U-shaped swing bending die for simultaneously bending multiple U-shaped load-sensing valve brackets for electric-driven rear axles of automobiles. By designing a rotatable lower bending die and adding a lower bending die support plate, the die life and product quality are improved. The U-shaped swing bending die is installed on a press to perform the swing bending process on the load-sensing valve brackets.

[0004] The second purpose of the present utility model is to design a method for using the automobile electric drive rear axle load-sensing valve bracket to bend multiple U-shaped swing bending molds at a time to replace the traditional three-step process (i.e., bending 1, bending 2, and shaping), especially a process of swing bending and shaping to reduce bending marks.

[0005] One of the purposes of this utility model is achieved in this way:

[0006] A U-shaped swing bending die for bending multiple U-shaped swinging parts of a load-sensing valve bracket for an electric-driven rear axle of an automobile at one time comprises a die upper structure and a die lower structure. The die upper structure comprises a die handle, an upper die plate, a guide sleeve, an upper pad, an upper fixing plate, a discharge spring, a bending upper die and a punching block.

[0007] The lower structure of the mold includes: a positioning plate, a lower fixed plate, a guide column, a rotating shaft, a bending lower mold support plate, a rotating bending lower mold, a lower pad, a lower mold plate, a push rod, a rotating shaft pressure plate and a gasket;

[0008] The curved upper die is installed in the fixed cavity of the upper fixed plate through interference fit, and is connected to the upper pad from the upper end surface through bolts, the die handle is installed in the die handle hole of the upper die through interference fit, the guide sleeve is installed in the guide sleeve holes on both sides of the upper die through interference fit, the punching block is directly placed in the punching block cavity of the curved upper die through clearance fit, the unloading spring is pre-compressed and installed in the corresponding unloading spring holes of the curved upper die and the upper pad, and the upper die plate and the upper pad are connected to the upper fixed plate through bolts and positioning pins;

[0009] The two bending lower mold support plates are installed on the left and right sides of the fixed cavity of the lower fixed plate through interference fit, and are connected to the lower fixed plate from the side by bolts respectively. The two rotating bending lower molds are directly placed in the guide cavities of the left and right bending lower mold support plates through clearance fit, and are connected to the gasket and the lower fixed plate through a rotating shaft. The rotating shaft and the rotating bending lower mold are interference fit, while the rotating shaft and the lower fixed plate and the gasket are all clearance fit, so that the rotating bending lower mold can rotate up and down freely around the rotating shaft. The four rotating shaft pressure plates are connected to the lower fixed plate from the side by bolts respectively, so as to prevent the rotating shaft from moving up and down. The guide pillars are installed in the guide pillar holes on both sides of the lower template through interference fit, the lower template and the lower pad are connected to the lower fixed plate by bolts and locating pins, the two ejector rods are directly placed in the corresponding ejector rod holes of the lower pad and the lower template through clearance fit, and the positioning plate is connected to the lower fixed plate from the upper end face by bolts.

[0010] Furthermore, the lower structure of the mold is provided with a rotatable rotating bending lower mold, so that the two U-shaped shapes of the load-sensing valve bracket can be bent out at the same time, and when the rotating bending lower mold rotates to the bottom dead point, the rotating bending lower mold has a shaping effect on the product to reduce the rebound of the product after bending.

[0011] Furthermore, the lower surface of the rotary bending lower die is provided with an upward slope of 0.4°. When the rotary bending lower die rotates to the bottom dead point, the rotary bending lower die has a shaping effect on the product to reduce the rebound of the product after bending.

[0012] Furthermore, the lower structure of the mold is additionally provided with a bending lower mold backing plate and an integral lower fixed plate, and the bending lower mold backing plate is fixed in the shape cavity of the lower fixed plate by interference fit, and the guide arc of the bending lower mold backing plate is gap-matched with the rotating arc of the rotating bending lower mold, and the single-side gap is 0.12 to 0.15 mm.

[0013] Furthermore, washers are provided on both the front and rear sides of the rotary bending lower die.

[0014] Furthermore, a punching block and a discharge spring are added to the upper structure of the mold for punching.

[0015] Furthermore, both the front and rear end surfaces of the rotating shaft are provided with rotating shaft pressure plates, which are connected to the side edges of the lower fixed plate.

[0016] Furthermore, the double-sided clearance between the guide post and the guide sleeve is 0.18 to 0.20 mm.

[0017] The second technical solution of the present invention is achieved as follows:

[0018] A process for swing-bending a load-sensing valve bracket of an electric-driven rear axle of an automobile by using the aforementioned U-shaped swing bending die to bend multiple U-shaped swing bending dies at one time comprises the following steps:

[0019] Step 1: Install the U-shaped swing bending die for bending multiple U-shaped swing bending parts of the automobile electric drive rear axle load sensing valve bracket at one time on a 100T press with a lower ejection cylinder;

[0020] Step 2: Start the press and move the lower ejector cylinder to the highest point of its stroke. The ejector cylinder pushes out the ejector rod, and the ejector rod pushes the rotary bending lower die and rotates upward around the rotating axis until the highest points of the arcs of the two corner points A and B on the rotary bending lower die are flush with the upper surface of the lower fixed plate.

[0021] Step 3: Place the two load-sensing valve brackets after the blanking and cutting processes side by side and flush in the positioning cavity of the positioning plate 9;

[0022] Step 4: Start the press, and the upper die plate moves downward along with the worktable on the machine. The upper bending die and the rotary bending lower die first press the product under the force of the lower ejector cylinder. Then, as the upper die plate continues to move downward, the upper bending die presses the product and causes the rotary bending lower die to rotate downward around the rotating axis until the lower surface of the rotary bending lower die is completely in contact with the upper surface of the lower pad. The upper bending die and the rotary bending lower die complete multiple U-shaped swing bending and shaping processes of the product.

[0023] Step 5: After the workpiece is bent, the upper slide of the press drives the upper part of the die to return to its original position. The punching block unloads the product under the force of the unloading spring and leaves the product in the lower die. The ejector rod, under the force of the ejector cylinder under the machine tool, pushes the rotating bending lower die to rotate upward around the rotating axis to eject the product. Then, auxiliary tools are used to remove the workpiece and place it in the material box.

[0024] Step 6: Repeat steps 2 to 5 to make the next two products.

[0025] The beneficial effects of the utility model are as follows: the lower part of the mold of the utility model is rotatable, and a bending lower mold support plate and other structures are added, and the traditional three processes (i.e., bending 1, bending 2, and shaping) are optimized into one process, thereby increasing production efficiency by 3.3 times and mold life by 2.7 times. The use of a swing bending process improves the appearance quality of the product (i.e., the bending marks of the product are very shallow), reduces production costs, and ensures stable product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional schematic diagram of the mold in the embodiment of the present utility model.

[0027] Figure 2 It is a schematic diagram of the top view of the lower structure of the mold in an embodiment of the present utility model.

[0028] Figure 3 This is a schematic diagram of the main structure of the product placed at the top dead center of the mold in an embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of the rotary bending lower die structure of the mold in the embodiment of the utility model.

[0030] Figure 5 It is a schematic structural diagram of the load sensing valve bracket in an embodiment of the present utility model.

[0031] Explanation of the accompanying reference numerals: mold handle 1, upper mold plate 2, guide sleeve 3, upper pad 4, upper fixed plate 5, unloading spring 6, bending upper mold 7, punching block 8, positioning plate 9, lower fixed plate 10, guide column 11, rotating shaft 12, bending lower mold support plate 13, rotating bending lower mold 14, lower pad 15, lower mold plate 16, push rod 17, rotating shaft pressure plate 18, gasket 19. DETAILED DESCRIPTION

[0032] The present invention can be specifically implemented through technical solutions, and the present invention can be further described through the following embodiments. However, the scope of the present invention is not limited to the following embodiments.

[0033] Reference Figures 1 to 5A U-shaped swing bending die for bending multiple U-shaped parts of a load-sensing valve bracket for an electric-driven rear axle of an automobile at one time, comprising an upper die structure and a lower die structure. The upper die structure comprises a die handle 1, an upper die plate 2, a guide sleeve 3, an upper pad 4, an upper fixing plate 5, a discharge spring 6, a bending upper die 7, and a punching block 8.

[0034] The lower structure of the mold includes: a positioning plate 9, a lower fixing plate 10, a guide column 11, a rotating shaft 12, a bending lower mold support plate 13, a rotating bending lower mold 14, a lower pad 15, a lower mold plate 16, a push rod 17, a rotating shaft pressure plate 18 and a gasket 19. Its characteristics are as follows: the bending upper die 7 is installed in the fixed cavity of the upper fixed plate 5 by interference fit, and is connected to the upper pad 4 from the upper end face by bolts, the die handle 1 is installed in the die handle hole of the upper template 2 by interference fit, the guide sleeve 3 is installed in the guide sleeve holes on both sides of the upper template 2 by interference fit, the punching block 8 is directly placed in the punching block cavity of the bending upper die 7 by clearance fit, the unloading spring 6 is pre-compressed and installed in the corresponding unloading spring holes of the bending upper die 7 and the upper pad 4, the upper template 2 and the upper pad 4 are connected to the upper fixed plate 5 by bolts and locating pins; the two bending lower die support plates 13 are installed on the left and right sides of the fixed cavity of the lower fixed plate 10 by interference fit, and are respectively connected to the lower fixed plate 10 from the side by bolts, and the two rotating bending lower dies 14 are directly placed on the left and right bending lower dies by clearance fit. The mold is in the guide cavity of the mold support plate 13 and is connected to the gasket 19 and the lower fixed plate 10 through the rotating shaft 12. The rotating shaft 12 and the rotary bending lower mold 14 are interference fit, and the rotating shaft 12 and the lower fixed plate 10 and the gasket 19 are clearance fit, so that the rotary bending lower mold 14 can rotate freely up and down around the rotating shaft 12. The four rotating shaft pressure plates 18 are connected to the lower fixed plate 10 from the side by bolts, so as to prevent the rotating shaft 12 from moving up and down. The guide column 11 is installed in the guide column holes on both sides of the lower template 16 by interference fit. The lower template 16 and the lower pad 15 are connected to the lower fixed plate 10 by bolts and locating pins. The two ejector rods 17 are directly placed in the corresponding ejector rod holes of the lower pad 15 and the lower template 16 by clearance fit, and the positioning plate 9 is connected to the lower fixed plate 10 from the upper end face by bolts.

[0035] The rotary bending lower die 14 can rotate freely around the rotating shaft 12, so that the two U-shaped shapes of the load-sensing valve bracket can be bent out at the same time. Moreover, when the rotary bending lower die 14 rotates to the bottom dead point (that is, the lower surface of the rotary bending lower die 14 is completely in contact with the upper surface of the lower pad 15), the rotary bending lower die 14 also has a shaping effect on the product to reduce the rebound of the product after bending, thereby ensuring the opening size of the product after bending. If the traditional bending die structure design is used (i.e. the bending lower die is fixed and cannot rotate), it is necessary to first divide the process into two steps to bend the two U-shaped shapes (i.e. bend the small U-shaped shape first, and then bend the large U-shaped shape. If two U-shaped shapes are bent at the same time in one process, because the product strip will interfere with the arc of the corner points of the bending upper die during the bending process, and the arc of the product bending corner is R1, the bending friction will increase, and the sheet will not flow easily, resulting in quality defects such as too deep bending marks on the product or thinning of the sheet thickness at the corners and cracking). Then, an additional shaping process is required to adjust the bending openings (because the traditional fixed bending die structure has a large rebound after bending, and the opening size of the product after bending is difficult to guarantee).

[0036] The lower surface of the rotary bending lower die 14 is provided with an upward slope of 0.4°. In this way, when the rotary bending lower die 14 rotates to the bottom dead point (that is, the lower surface of the rotary bending lower die 14 is completely in contact with the upper surface of the lower pad 15), the rotary bending lower die 14 has a shaping effect on the product to reduce the rebound of the product after bending, thereby ensuring the opening size of the product after bending.

[0037] The lower die part is additionally provided with a bending lower die support plate 13 and an integral lower fixed plate 10, and the bending lower die support plate 13 is fixed in the cavity of the lower fixed plate 10 by interference fit, and the guide arc of the bending lower die support plate 13 is gap-matched with the rotating arc of the rotating bending lower die 14, and the single-sided gap is 0.12 to 0.15 mm. This can not only ensure that the rotating bending lower die 14 rotates smoothly in the guide arc of the bending lower die support plate 13 without being stuck, but also improve the strength of the rotating bending lower die 14 (because during the bending process, the rotating bending lower die 14 is always subjected to outward lateral force), thereby improving the mold life and product quality.

[0038] Washers 19 are added to the front and rear sides of the rotary bending lower die 14 to prevent the front and rear sides of the rotary bending lower die 14 from directly contacting the inner cavity of the lower fixed plate 10 (i.e., reducing the contact area), thereby ensuring that the rotary bending lower die 14 can rotate freely around the rotating shaft 12 (because during the bending process, the rotary bending lower die 14 sometimes moves forward and backward a little. If the washers 19 are not added, the front and rear sides of the rotary bending lower die 14 sometimes directly contact the inner cavity of the lower fixed plate 10, and the contact area is large, which makes the rotary bending lower die 14 rotate around the rotating shaft 12 not smoothly or get stuck).

[0039] The upper structure of the mold is additionally provided with a punching block 8 and a discharge spring 6 for punching the material, which can prevent the product from sticking to the mold, thereby improving production efficiency.

[0040] The front and rear ends of the rotating shaft 12 of the lower structure of the mold are both provided with rotating shaft pressing plates 18, which are connected to the side of the lower fixed plate 10, so as to prevent the rotating shaft 12 from moving forward and backward and affecting the smoothness of the rotation of the rotating bending lower mold 14.

[0041] The double-surface clearance between the guide post 11 and the guide sleeve 3 is 0.18 to 0.20 mm.

[0042] The present invention is described in detail below in conjunction with specific processing embodiments, as follows:

[0043] The U-shaped swing bending die for bending multiple U-shaped load-sensing valve brackets of the rear axle of the Jiangling JCE3-T EV electric light truck at one time is installed on a 100T pneumatic press in the same way as a common stamping die.

[0044] This type of rear axle load-sensing valve bracket for the Jiangling JCE3-T EV electric light truck is made from 3.0mm thick ST12 cold-rolled sheet through stamping. After the blanking and blanking processes, it can be directly used for the swing bending die bending process:

[0045] Step 1: Install the U-shaped swing bending die for bending multiple U-shaped swing bending parts of the automobile electric drive rear axle load sensing valve bracket at one time on a 100T press with a lower ejection cylinder;

[0046] Step 2: Start the press machine and move the lower ejector cylinder to the highest point of its stroke. The ejector cylinder ejects the ejector rod 17, and the ejector rod 17 pushes the rotating bending lower die 14 and rotates upward around the rotating shaft 12 until the highest points of the arcs of the two corner points A and B on the rotating bending lower die 14 are flush with the upper surface of the lower fixed plate 10;

[0047] Step 3: Place the two load-sensing valve bracket products after the blanking and blanking processes side by side in the positioning cavity of the positioning plate 9 (i.e., fix the two side edges of the workpiece and the front end surface of the workpiece 1);

[0048] Step 4: Start the press, and the upper template 2 moves downward with the worktable on the machine. The bending upper die 7 and the rotary bending lower die 14 first press the product under the force of the lower ejector cylinder. Then, as the upper template 2 continues to move downward, the bending upper die 7 presses the product to make the rotary bending lower die 14 rotate downward around the rotating shaft 12 until the lower surface of the rotary bending lower die 14 is completely in contact with the upper surface of the lower pad 15. The bending upper die 7 and the rotary bending lower die 14 complete multiple U-shaped swing bending and shaping processes of the product.

[0049] Step 5: After the workpiece is bent, the upper slide of the press drives the upper part of the die to return to its original position. The punching block 8 unloads the product under the force of the unloading spring 6 and leaves the product in the lower die. The ejector 17, under the force of the ejector cylinder under the machine tool, pushes the rotating bending lower die 14 to rotate upward around the rotating axis 12 to eject the product. Then, the workpiece is taken out with auxiliary tools and placed in the material box.

[0050] Step 6: Repeat steps 2 to 5 to make the next two products.

[0051] The rear axle load-sensing valve bracket for the Jiangling JCE3-T EV electric light truck utilizes a multi-U-shaped swing bending die and process, ensuring that all bending dimensions remain within tolerance. This streamlined process, which traditionally involves three steps (bend 1, bend 2, and shaping), reduces production efficiency by 3.3 times and saves the mold development costs of two separate steps. The rotatable lower mold section and the addition of a lower mold support plate increase mold life by 2.7 times. The swing bending process improves product appearance (resulting in minimal bend marks), thereby reducing production costs. This ensures that the rear axle load-sensing valve bracket for the Jiangling JCE3-TEV electric light truck consistently and reliably meets the design requirements of the product drawings.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A U-shaped swing bending die for a vehicle electric drive rear axle load sensing valve bracket, comprising a die upper structure and a die lower structure, wherein: The upper structure of the mold includes: mold handle, upper mold plate, guide sleeve, upper pad, upper fixed plate, unloading spring, bending upper mold and punching block; The lower structure of the mold includes: a positioning plate, a lower fixed plate, a guide column, a rotating shaft, a bending lower mold support plate, a rotating bending lower mold, a lower pad, a lower mold plate, a push rod, a rotating shaft pressure plate and a gasket; The feature is that the curved upper die is installed in the fixed cavity of the upper fixed plate through interference fit, and is connected to the upper pad from the upper end surface through bolts, the die handle is installed in the die handle hole of the upper die through interference fit, the guide sleeve is installed in the guide sleeve holes on both sides of the upper die through interference fit, the punching block is directly placed in the punching block cavity of the curved upper die through clearance fit, the unloading spring is pre-compressed and installed in the corresponding unloading spring holes of the curved upper die and the upper pad, and the upper die plate and the upper pad are connected to the upper fixed plate through bolts and positioning pins; The two bending lower mold support plates are installed on the left and right sides of the fixed cavity of the lower fixed plate through interference fit, and are connected to the lower fixed plate from the side by bolts respectively. The two rotating bending lower molds are directly placed in the guide cavities of the left and right bending lower mold support plates through clearance fit, and are connected to the gasket and the lower fixed plate through a rotating shaft. The rotating shaft and the rotating bending lower mold are interference fit, while the rotating shaft and the lower fixed plate and the gasket are all clearance fit, so that the rotating bending lower mold can rotate up and down freely around the rotating shaft. The four rotating shaft pressure plates are connected to the lower fixed plate from the side by bolts respectively, so as to prevent the rotating shaft from moving up and down. The guide pillars are installed in the guide pillar holes on both sides of the lower template through interference fit, the lower template and the lower pad are connected to the lower fixed plate by bolts and locating pins, the two ejector rods are directly placed in the corresponding ejector rod holes of the lower pad and the lower template through clearance fit, and the positioning plate is connected to the lower fixed plate from the upper end face by bolts.

2. The U-shaped swing bending die for bending multiple U-shaped swing bending devices at one time according to claim 1, characterized in that: The lower structure of the mold is provided with a rotatable rotary bending lower die, so that the two U-shaped shapes of the load-sensing valve bracket are bent out at the same time. Moreover, when the rotary bending lower die rotates to the bottom dead point, the rotary bending lower die has a shaping effect on the product to reduce the rebound of the product after bending.

3. A U-shaped swing bending die for bending multiple U-shaped swing bending devices at one time according to claim 1 or 2, characterized in that: The lower surface of the rotary bending lower die is provided with an upward slope of 0.4°. When the rotary bending lower die rotates to the bottom dead point, the rotary bending lower die has a shaping effect on the product to reduce the rebound of the product after bending.

4. A U-shaped swing bending die for bending multiple U-shaped swing bending devices at one time according to claim 1 or 2, characterized in that: The lower structure of the mold is additionally provided with a bending lower mold backing plate and an integral lower fixed plate, and the bending lower mold backing plate is fixed in the shape cavity of the lower fixed plate by interference fit, and the guide arc of the bending lower mold backing plate is gap-matched with the rotating arc of the rotating bending lower mold, and the single-side gap is 0.12 to 0.15 mm.

5. A U-shaped swing bending die for bending multiple U-shaped swing bending devices at one time according to claim 1 or 2, characterized in that: Washers are additionally provided on both the front and rear sides of the rotary bending lower die.

6. A U-shaped swing bending die for bending multiple U-shaped swing bending devices at one time according to claim 1 or 2, characterized in that: The upper structure of the mold is additionally provided with a punching block and a discharge spring for punching.

7. A U-shaped swing bending die for bending multiple U-shaped swing bending devices at one time according to claim 1 or 2, characterized in that: The front and rear end surfaces of the rotating shaft are both provided with rotating shaft pressing plates, which are connected to the side edges of the lower fixed plate.

8. The automobile electric drive rear axle load sensing valve bracket bending multiple U-shaped swing bending molds according to claim 1 or 2, characterized in that: The double-sided clearance between the guide post and the guide sleeve is 0.18-0.20 mm.

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