A punching device for a bumper of an automobile

Abstract

A punching device for automobile bumper, wherein a base supports a lower die through a support table, an output shaft of a punching implement of a frame is downward and connected with an upper die, a plurality of upper adjusting oil cylinders are arranged around the punching implement, a plurality of lower adjusting oil cylinders are arranged around the support table, adjusting seats are connected with output shafts of the upper adjusting oil cylinders and the lower adjusting oil cylinders, ball bodies are embedded on surfaces of the adjusting seats, surfaces of the upper die and the lower die are all abutted against annular pads through spring arrays, and non-Newtonian fluid materials are filled in the annular pads. The multidirectional rotation structure of the ball bodies is adapted to the irregular curved surface of the outer surface of the bumper and forms stable clamping; meanwhile, the non-Newtonian fluid in the annular pad is hardened at the moment of stamping to provide effective supporting force, effectively avoiding the possibility of crack and deformation defects caused by die matching error, improving the stamping quality and ensuring the stable clamping of the outer curved surface of the bumper and the anti-impact performance after punching, so that the bumper product can maximize its vehicle protection function.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile component processing and manufacturing, and particularly relates to a punching device for automobile bumpers. BACKGROUND

[0002] The punching device is a device for punching, stamping or molding thin sheet materials by using power driving. With the development of manufacturing technology, the punching machine has become an important processing equipment in manufacturing industry due to its increasingly rich functions and application fields.

[0003] However, although the functions of the punching device are approaching perfection, there are still many drawbacks in the application of some special workpiece manufacturing operations. For example, when the punching operation is performed on the automobile bumper, since the outer shell of the bumper is usually made of plastic material, the bumper is brittle and thin-walled. If there is a matching error between the profile of the punching die and the bumper, cracks or stress deformation will be easily generated during the punching process, which reduces the impact resistance of the bumper assembly. In addition, the outer surface of the bumper product is irregular, and the punching machine is difficult to form stable clamping, which leads to a certain degree of error in the punching position, affects the overall alignment and appearance quality of the bumper assembly, and greatly reduces the vehicle protection function of the bumper. SUMMARY

[0004] In view of the above problems in the prior art, the present application provides a punching device for automobile bumpers, which can avoid the cracks and deformation defects caused by matching errors during the punching process of the bumper, ensure the stable clamping of the outer surface and the impact resistance after punching, improve the overall alignment and appearance quality of the bumper assembly, and maximize the vehicle protection function of the bumper product.

[0005] The application is implemented by the following technical scheme: a punching device for automobile bumpers, comprising a base, wherein the base is provided with a lower die supported by a support table, a rack is provided above the base, a punching executor is fixedly installed on the rack, the output shaft of the punching executor faces downward and is connected with an upper die, the punching executor and the upper die are located directly above the lower die, and a working area is formed between the lower die and the upper die; a plurality of upper oil cylinders arranged with the upper oil cylinders as the center are arranged around the punching executor, a plurality of lower oil cylinders arranged with the lower oil cylinders as the center are arranged around the support table, the upper oil cylinders and the lower oil cylinders are located above and below the working area respectively, the cylinder bodies of the upper oil cylinders and the lower oil cylinders are fixed through the rack and the base respectively, the output shafts of the upper oil cylinders and the lower oil cylinders are connected with adjusting seats, the surface of the adjusting seat facing the working area is embedded with a ball body, the surfaces of the punching grooves or the punching heads of the upper die and the lower die are provided with spring arrays, and the spring arrays are respectively abutted against annular pads, and the annular pads are filled with non-Newtonian fluid materials.

[0006] Further, the annular pad is composed of a hard ring layer, a deformation ring layer and a surface ring layer attached in sequence, the surface of the surface ring layer faces the working area, the hard ring layer is made of a metal material, the deformation ring layer is made of a metal film wrapped with non-Newtonian fluid material, and the surface ring layer is made of a metal film material.

[0007] Further, the lower surface of the annular pad in the upper die exceeds the lower surface of the punching head.

[0008] Further, a telescopic shaft is arranged between the adjusting seat and the output shaft of the oil cylinder connected with the adjusting seat, and a compression spring is sleeved on the outer periphery of the telescopic shaft.

[0009] Further, the punching executor is a servo cylinder.

[0010] Further, a bumper shell is arranged in the working area.

[0011] The beneficial effects of the present application are: the upper adjusting oil cylinder, the lower adjusting oil cylinder and the adjusting seat structure arranged on the periphery of the upper and lower molds of the device, the upper and lower clamping pressures are formed on the middle bumper shell by the ball bodies of the adjusting seat, the multidirectional rotation structure of the ball bodies is adapted to the irregular curved surface of the outer surface of the bumper, and stable clamping is formed; at the same time, through the characteristics of the hardening of the non-Newtonian fluid in the annular pad under impact, the annular pad forms a surface form matched with the bumper shell during the uniform speed pressing stage of the punching executive part, and then the non-Newtonian fluid in the annular pad is hardened to provide effective supporting force at the moment of punching, which can effectively avoid the possibility of cracks and deformation defects caused by mold matching errors, improve the punching quality and ensure the stable clamping of the outer surface curve of the bumper and the anti-impact performance after punching, improve the overall alignment and appearance quality of the bumper assembly, and make the bumper product maximize its vehicle protection function. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic diagram of an embodiment of the present application;

[0013] Figure 2 is a partial structural schematic diagram of an embodiment of the present application;

[0014] Figure 3 is a pre-punching operation schematic diagram of an embodiment of the present application;

[0015] Figure 4 is a punching operation schematic diagram of an embodiment of the present application.

[0016] In the figure: 1-base, 2-supporting table, 3-lower mold, 3a-punching groove, 4-rack, 5-punching executive part, 6-upper mold, 6a-punching head, 7-upper adjusting oil cylinder, 8-lower adjusting oil cylinder, 9-adjusting seat, 9a-ball body, 9b- telescopic shaft, 9c-compression spring, 10-annular pad, 10a-hard ring layer, 10b-deformation ring layer, 10c-surface ring layer, 11-spring array, 12-bumper shell. DETAILED DESCRIPTION

[0017] The present application will be further described in detail below in conjunction with the drawings and embodiments of the present application.

[0018] As Figures 1-2As shown, a punching device for automobile bumper includes a base 1, wherein the base 1 is provided with a lower die 3 supported by a support table 2, a rack 4 is provided above the base 1, a punching executor 5 is fixedly installed on the rack 4, an output shaft of the punching executor 5 is downwardly connected with an upper die 6, the punching executor 5 and the upper die 6 are located directly above the lower die 3, and a working area is formed between the lower die 3 and the upper die 6; a plurality of upper adjusting cylinders 7 are arranged around the punching executor 5, a plurality of lower adjusting cylinders 8 are arranged around the support table 2, the upper adjusting cylinders 7 and the lower adjusting cylinders 8 are located above and below the working area respectively, the cylinder bodies of the upper adjusting cylinders 7 and the lower adjusting cylinders 8 are fixedly connected to the rack 4 and the base 1 respectively, the output shafts of the upper adjusting cylinders 7 and the lower adjusting cylinders 8 are connected with adjusting seats 9, the surface of the adjusting seat 9 facing the working area is embedded with a ball body 9a, the surface of the punching groove 3a or the punching head 6a of the upper die 6 and the lower die 3 is provided with a spring array 11, and the spring array 11 is abutted against a ring-shaped pad 10, and the ring-shaped pad 10 is filled with non-Newtonian fluid material. The non-Newtonian fluid has the characteristics of normal liquid and hardening under impact, thereby providing a stable clamping surface for the punching object in the working area.

[0019] In the embodiment, the ring-shaped pad 10 is sequentially attached by a hard ring layer 10a, a deformation ring layer 10b and a surface ring layer 10c, the outer surface of the surface ring layer 10c faces the working area, the hard ring layer 10a is made of metal material, the deformation ring layer 10b is made of metal film wrapped non-Newtonian fluid material, and the surface ring layer 10c is made of metal film material. The metal film has good toughness and strength, and can adapt to the softening and hardening physical characteristics of the non-Newtonian fluid in the inner layer, thereby successfully completing the clamping operation of the ring-shaped pad 10.

[0020] In the embodiment, the lower surface of the ring-shaped pad 10 in the upper die 6 exceeds the lower surface of the punching head 6a, specifically, the lower surface of the surface ring layer 10c in the upper die 6 exceeds the lower surface of the punching head 6a, thereby ensuring that the ring-shaped pad 10 preferentially contacts the bumper shell 12, and the non-Newtonian fluid in the ring-shaped pad 10 is first deformed in a flexible manner under uniform pressure, thereby forming a matching surface of the bumper shell 12.

[0021] In the embodiment, the adjusting seat 9 and the output shaft of the oil cylinder connected thereto are provided with an extension shaft 9b, and the extension shaft 9b is provided with a compression spring 9c, thereby ensuring that each group of adjusting seats 9 can be abutted with the curved surface of the bumper shell 12 under the action of the oil cylinder, and the compression amount of the compression spring 9c can adapt to the irregular shape of the curved surface of the bumper shell 12, thereby forming stable clamping.

[0022] The working principle of the embodiment is as follows:

[0023] S1: use an automatic carrier to place a batch of bumper shells 12 produced in the working area of the punching device, as shown inFigure 2 The state shown, and then, the punch execution member 5 is started at a constant speed to make its output shaft extend, so that the upper annular pad 10 is pressed at a constant speed until the surface ring layer 10c touches the bumper shell 12, and then the lower surface of the bumper shell 12 touches the surface ring layer 10c of the lower annular pad 10, generating an upper and lower clamping force on the bumper shell 12, and forming a seamless fit as shown in Figure 3 The state shown, and at this time, the punch execution member 5 is driven at a constant speed to press the annular pad 10 and contact the bumper shell 12, so that the non-Newtonian fluid of the inner layer deformation ring layer 10b exhibits the softening characteristics of a liquid, and the irregular curved surface of the bumper shell 12 deforms the surface ring layer 10c of the metal film material and transmits the pressure stress to the inner layer deformation ring layer 10b, so that the non-Newtonian fluid in the annular pad 10 is first deformed in flexible deformation under constant pressure, thereby forming a seamless fit with the bumper shell 12, and ensuring that the punch head 6a maintains a certain distance from the bumper shell 12;

[0024] S2: Start the upper and lower adjusting cylinders 7 and 8 to make their output shafts extend, so that the upper and lower adjusting seats 9 move towards the middle bumper shell 12, and the bumper shell 12 is pressed by the upper rolling body of the adjusting seat 9, at this time, no matter the size of the curved surface slope of the bumper shell 12, the multidirectional rotation function of the two side ball bodies 9a can form a seamless fit, and the compression amount of the compression spring 9c of each adjusting seat 9 can adapt to the irregular shape of the curved surface of the bumper shell 12, thereby forming a stable clamping action on the bumper shell 12;

[0025] S3: Start the punch execution member 5 and drive the upper die 6 to press down at an accelerated state, at this time, the punch head 6a completes the accelerated motion within the distance between it and the bumper shell 12, presses the upper annular pad 10, and impacts the lower bumper shell 12 and again presses the lower annular pad 10, in this process, the upper annular pad 10 and the lower annular pad 10 are pressed downward by the output shaft of the punch execution member 5, so that the non-Newtonian fluid of the deformation layer in the annular pad 10 is hardened by the instantaneous impact, and since the annular pad 10 has formed a softened fit with the bumper shell 12 in step S1, the hardening of the deformation layer can promote the hardening of the fit between the annular pad 10 and the bumper shell 12, forming a seamless hardening fit surface in a short time, at this time, the bumper shell 12 is impacted and punched by the punch head 6a (as shown in Figure 4 The state shown), which can effectively avoid matching errors and related defects such as cracks and deformation, and the material after punching is extruded into the hole of the lower annular pad 10 and the punching groove 3a of the lower die 3, completing the punching operation and obtaining a bumper product with excellent punching quality.

[0026] Through the above operation, the bumper shell 12 is applied stable clamping and seamless matching punching environment, so as to improve the stamping quality and ensure the bumper outer surface of the stable clamping and anti-impact performance after punching, improve the overall alignment of the bumper assembly and the appearance quality, make the bumper product maximize its due vehicle protection function.

[0027] In the embodiment, the servo cylinder of the punching implement type uses the high precision of the servo cylinder to provide the operation function of two kinds of uniform speed and acceleration down pressure state, so as to successfully stimulate the physical properties of the non-Newtonian fluid and smoothly form the seamless hardening matching surface.

[0028] The above only describes the preferred embodiments of the present application, and does not limit the form of the present application, and it should be understood that for ordinary skilled in the art, the embodiments can be other forms of equivalent replacement, within the scope of the characteristics defined by the claims, all should be included in the protection scope of the present application.

Claims

1. A punching device for automobile bumpers, comprising a base, characterized in that: The base is supported by a support platform for a lower die, and a frame is provided above the base. A punching actuator is fixedly mounted on the frame. An upper die corresponding to the lower die is provided on the output shaft of the punching actuator. A working area is formed between the lower die and the upper die. The punching actuator is surrounded by multiple upward adjusting cylinders arranged around it, and the support platform is surrounded by multiple downward adjusting cylinders arranged around it. The output shafts of the upward adjusting cylinders and the downward adjusting cylinders are equipped with adjusting seats. Ball bearings are embedded in the surface of the adjusting seats facing the working area. The punching slots or punching heads of the upper die and the lower die are all equipped with spring arrays, which abut against the annular pads. The annular pads are filled with non-Newtonian fluid material. The annular pad is composed of a rigid annular layer, a deformable annular layer, and a surface annular layer attached sequentially. The outer surface of the surface annular layer faces the working area. The rigid annular layer is made of a metal material, the deformable annular layer is made of a non-Newtonian fluid material wrapped in a metal film, and the surface annular layer is made of a metal film material. The lower surface of the annular pad in the upper mold extends beyond the lower surface of the punch head.

2. The punching equipment for automobile bumpers as described in claim 1, characterized in that: The cylinder bodies of the upper adjustment cylinder and the lower adjustment cylinder are fixed by the frame and the base, respectively.

3. The punching equipment for automobile bumpers as described in claim 1, characterized in that: A telescopic shaft is provided between the adjusting seat and the output shaft of the connected oil cylinder, and a compression spring is fitted around the telescopic shaft.

4. The punching equipment for automobile bumpers as described in claim 1, characterized in that: The servo electric cylinder of the punching actuator type.

5. The punching equipment for automobile bumpers as described in claim 1, characterized in that: The working area is equipped with a bumper shell.

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