Floating type die for flattening and forming pipe fitting

Abstract

The utility model discloses a floating type die for flattening and forming a pipe fitting. The floating type die comprises an upper die, a lower die, a guide column, a lining core, a hydraulic cylinder and an induction control system. The upper die consists of an upper die frame and a split upper die core; the upper die core comprises an upper floating die core and an upper fixed die core which are in floating connection through a first spring; the lower die comprises a lower die frame and a split type lower die core, the lower floating die core is in floating connection through a second spring, and the lining core is driven by an air cylinder to move horizontally and floats up and down through a third spring. The mold is linked with the control valve through the inductive switch, the lining core is triggered to be jacked into a pipe fitting blank to be positioned before pressing, the floating mold core and the lining core adjust the height in a self-adaptive mode along with material deformation in the pressing process, and the lining core automatically retracts in the demolding process. The mold solves the problems of forming deviation, demolding adhesion and poor process adaptability caused by a traditional fixed lining core, and has the characteristics of high dynamic pressure regulation precision, high demolding success rate and compatibility of special-shaped pipe fittings and thin-wall materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of molds, in particular to a floating mold for pipe flattening forming, which is especially suitable for the flattening forming of circular pipes. BACKGROUND

[0002] In the mechanical processing technology, flat pipes or special-shaped pipes are usually obtained by flattening forming of circular pipes. In the flattening forming process of the traditional mold, the pipe blank is prone to deviation or deformation due to uneven stress, and the demolding is difficult. In the prior art, the inner liner core for forming the internal structure of the pipe is usually designed as a fixed type, which cannot adapt to the dynamic adjustment requirement in the material deformation process, resulting in low product yield. In addition, the inner liner core and the formed product are prone to adhesion during demolding, which requires additional manual intervention, resulting in low efficiency. SUMMARY

[0003] To solve the above problems, the purpose of the present application is to provide a floating mold for pipe flattening forming, which realizes the functions of pneumatic filling and stripping through the floating installation and inductive control of the inner liner core, and improves the forming precision and demolding efficiency.

[0004] To achieve the above purpose, the present application adopts the following technical scheme:

[0005] The floating mold for pipe flattening forming comprises an upper mold, a lower mold and an inner liner core, the upper mold is movably connected to the lower mold through guide columns and is driven to move up and down by a hydraulic cylinder;

[0006] The upper mold comprises an upper mold frame, a split upper mold core and an upper mold clamping plate, the upper mold core comprises an upper floating mold core and an upper fixed mold core, the upper floating mold core is floatingly connected to the upper mold clamping plate through a first spring;

[0007] The lower mold comprises a lower mold frame, a split lower mold core and a lower mold clamping plate, the lower mold core comprises a lower floating mold core and a lower fixed mold core, the lower floating mold core is floatingly connected to the lower mold clamping plate through a second spring;

[0008] The inner liner core is drivingly connected to a pneumatic cylinder to realize left-right movement, and is elastically connected to an inner liner core guide seat through a third spring to realize up-down floating.

[0009] Further, the left-right movement path of the inner liner core is perpendicular to the pressing direction of the upper mold core, and the surface of the inner liner core is provided with an anti-sticking coating.

[0010] Further, the floating stroke range of the upper floating mold core and the lower floating mold core is 5-20mm.

[0011] Further, the floating mold further comprises an inductive control system, the inductive control system comprises:

[0012] A contact type induction switch is arranged at a blank placing area of the lower mold core.

[0013] A control valve is connected with the cylinder, and the control valve controls the ejection or retraction of the inner liner core according to the signal of the contact type induction switch.

[0014] Further, the contact type induction switch is one of a photoelectric type, a pressure type or a displacement type sensor.

[0015] Further, a linear bearing is arranged between the guide column and the upper mold frame, and the forming precision of the hydraulic cylinder is ±0.1 mm.

[0016] Further, the inner liner core guide seat is provided with a sliding guide rail, and the inner liner core is horizontally moved through the sliding guide rail.

[0017] Further, the third spring is one of a butterfly spring, a spiral spring or a gas spring, and the up-down floating stroke of the inner liner core is 2-10 mm.

[0018] Further, the cylinder can be replaced by an electric push rod, a hydraulic cylinder or a lead screw mechanism driven by a servo motor.

[0019] Further, the mold is used for the flattening forming of a circular pipe, the local forming of a special-shaped pipe or the stamping forming of a thin-walled part.

[0020] The beneficial effects of the present application are as follows:

[0021] 1. The inner liner core floating design can dynamically adjust the height, so as to avoid material tearing or uneven deformation.

[0022] 2. The induction control system realizes automatic filling and demolding, and improves the production efficiency.

[0023] 3. The spring and the guide rail are combined to ensure the movement precision and the service life of the inner liner core. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 According to some embodiments of the present application, a structural schematic view of a floating mold for pipe flattening forming is shown.

[0025] Figure 2 According to some embodiments of the present application, a front view of the floating mold is shown.

[0026] Figure 3 According to some embodiments of the present application, a sectional view in the direction of A-A is shown. Figure 2

[0027] Figure 4 According to some embodiments of the present application, a sectional view in the direction of B-B is shown. Figure 2 ​A sectional view along the direction of B-B;

[0028] Figure 5 According to some embodiments of the present application, a structural diagram of the inner liner core and its driving device is shown. DETAILED DESCRIPTION

[0029] The technical features and advantages of the present application will be described in more detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application can be more clearly defined.

[0030] It should be noted that in the description of the present application, the terms indicating the direction or positional relationship of "up", "down", "left", "right", "inner", "outer" and the like are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the importance of the technical features shown.

[0032] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] Please refer to Figures 1-5 The embodiment of the present application provides a floating mold for pipe flattening forming, which comprises an upper mold 100, a lower mold 200, an inner liner core 300, guide columns 400, hydraulic cylinders, air cylinders 500 and an induction control system.

[0034] Upper die 100: composed of upper die frame 110, split upper die core 120 and upper die clamp plate 130, upper die core 120 is divided into upper floating die core 121 and upper fixed die core 122, upper floating die core 121 deviates from the top of the blank mounting area and is connected with upper die clamp plate 130 by first spring, to adapt to the material deformation in the pressing process. The position of upper die frame 110 matched with upper floating die core 121 can be designed with multiple first guide grooves 111, for guiding the floating of upper floating die core 121, the first guide groove 111 can be designed in dovetail shape. Upper fixed die core 122 and upper die clamp plate 130 can be fixedly connected by bolts. Upper die frame 110 is movably connected with lower die frame 210 through guide column 400, and can move up and down under the drive of hydraulic cylinder, to realize clamping and unclamping. Upper die frame 110 can be made of Cr12MoV steel, and the surface is treated with nitriding to improve the hardness; upper floating die core 121 can be installed by multiple groups of first springs to improve the stability, the elastic coefficient of the first spring is 50N / mm, and the floating stroke of upper floating die core 121 is 5-20mm.

[0035] Lower die 200: composed of lower die frame 210, split lower die core 220 and lower die clamp plate 230, lower die core 220 includes lower floating die core 221 and lower fixed die core 222, lower floating die core 221 deviates from the bottom of the blank mounting area and is connected with lower die clamp plate 230 by second spring. The position of lower die frame 210 matched with lower floating die core 221 can be designed with multiple second guide grooves 211, for guiding the floating of lower floating die core 221, the second guide groove 211 can also be designed in dovetail shape. Lower fixed die core 222 and lower die clamp plate 230 can be fixedly connected by bolts. Lower die frame 210 can be made of Cr12MoV steel, and the surface is treated with nitriding to improve the hardness. The floating stroke of lower floating die core 221 is 5-20mm.

[0036] Inner liner core 300: arranged on one side of lower die 200, driven to move left and right by air cylinder 500, when inner liner core 300 moves left, it enters the inside of pipe blank, for forming the internal structure in the process of pipe flattening forming, when inner liner core 300 moves right, it exits the inside of pipe blank. Inner liner core guide seat 310 is arranged between inner liner core 300 and air cylinder 500, for guiding the left and right movement of inner liner core 300. At the same time, inner liner core 300 and inner liner core guide seat 310 are elastically connected by third spring, so that inner liner core 300 can float up and down within a small range. Inner liner core guide seat 310 can be provided with sliding guide rail 320, to ensure the accuracy of horizontal movement. The material of inner liner core 300 is SKD11, and the surface is treated with titanium plating. The sliding guide rail 320 can be linear ball guide rail, and the repeat positioning accuracy is ≤0.02mm.

[0037] Induction control system: including contact type induction switch and control valve, the contact type induction switch is installed in the blank mounting area of the lower mold 200, used for detecting the blank position after triggering the control valve, the control valve linkage cylinder 500, used for controlling the ejection or retraction of the inner liner core 300.

[0038] The working principle of the floating mold of the embodiment of the application is as follows:

[0039] 1. Blank placement: place the circular pipe blank in the positioning area of the lower mold 200, and after the contact type induction switch detects the blank, trigger the control valve to act, the control valve pneumatic cylinder 500 drives the inner liner core 300 to enter the inside of the pipe blank;

[0040] 2. Pressing stage: the hydraulic cylinder drives the upper mold 100 to press down, and the upper floating mold core 110 and the lower floating mold core 210 adaptively deform under the action of the spring, and the inner liner core 300 floats up and down with the pressing process, ensuring uniform molding;

[0041] 3. Demolding stage: the upper mold 100 is driven by the hydraulic cylinder to return to the upper limit, the contact type induction switch triggers the control valve to drive the inner liner core 300 to retract, and the molded product is retained in the lower mold 200 and taken out by a mechanical hand or manually.

[0042] In the above embodiment, the first spring, the second spring and the third spring can be metal springs, or can be gas springs or rubber elastic bodies, etc. The contact type induction switch can be one of photoelectric, pressure or displacement sensors, or can be replaced by an infrared sensor or a pressure sensor. The cylinder 500 can be replaced by a servo electric push rod to realize precise position control. The application scenarios of the embodiment of the application include but are not limited to the flattening molding of automobile exhaust pipes, air conditioner fans and metal decorative parts.

[0043] In some embodiments, in order to facilitate processing, the upper fixed mold core 122 and the lower fixed mold core 222 can be designed in a segmented manner, segmented according to the shape characteristics of the product, and then fixedly installed in the upper mold frame 110 and the lower mold frame 210, respectively.

[0044] The floating mold of the embodiment of the application has the following beneficial effects:

[0045] 1. Dynamic adaptive molding, improving product precision:

[0046] The upper floating mold core 122 and the lower floating mold core 222 are connected through springs and can adaptively adjust the height during the pressing process, avoiding the offset, distortion or local tearing of the pipe caused by uneven stress, and ensuring the molding size precision (the tolerance can be controlled within ±0.1 mm), especially suitable for processing high-precision pipes or thin-walled pipes.

[0047] 2. Pneumatic filling and stripping, reducing demolding difficulty:

[0048] The inner liner core 300 is driven to eject by the pneumatic cylinder 500, accurately positioning the pipe inside before pressing, preventing the blank from shifting; when demolding, the inner liner core 300 is automatically retracted by the induction system, combined with the surface anti-sticking coating, effectively solving the problem of product and inner liner core sticking in traditional molds, and the demolding success rate is improved to more than 99%.

[0049] 3. Floating inner liner core design, enhancing process adaptability:

[0050] The inner liner core 300 realizes up and down floating through the third spring, dynamically adjusts the height during the mold closing process with material deformation, avoids stress concentration caused by rigid contact, especially suitable for special-shaped pipe fittings or asymmetric pressing process, and can be compatible with different wall thickness (0.5-5mm) of metal or plastic materials.

[0051] 4. Automatic induction control, improve production efficiency:

[0052] The contact type induction switch is linked with the control valve to realize the full automation of blank positioning, inner liner core ejection / retraction, the single forming cycle is shortened by 30%-40%, manual intervention is reduced, and it is suitable for large batch processing scenes in continuous production line.

[0053] 5. Modular design, low maintenance cost:

[0054] The floating mold core of the upper mold 100 and the lower mold 200 can be detachably installed, the spring and the sliding guide rail 320 are standard parts, which can be quickly replaced after local wear, and the mold maintenance cost is reduced by more than 50%.

[0055] 6. Multi-scene compatibility, expand application range:

[0056] By adjusting the spring elastic coefficient of the floating mold core or replacing the size of the inner liner core 300, various processing needs such as circular pipe flattening, special-shaped pipe local forming (such as bending, slotting) and thin-walled stamping parts (such as metal decorative sheet) can be adapted, and the mold versatility is significantly improved.

[0057] 7. Stability and life optimization:

[0058] The sliding guide rail 320 of the inner liner core guide seat 310 adopts high-precision linear ball structure, cooperates with the stroke accuracy of the pneumatic cylinder 500, ensures the repeatability and stability of the inner liner core 300, and prolongs the overall life of the mold to more than 500,000 times.

[0059] In the description of the specification, the description of the terms "some embodiments", "some examples", "exemplarily", "example", "preferably", or "further" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A floating mold for flattening and forming pipe fittings, characterized in that, include: The upper mold (100), the lower mold (200), and the inner liner (300) are provided. The upper mold (100) is movably connected to the lower mold (200) via a guide post (400) and is driven by a hydraulic cylinder to move up and down. The upper mold (100) includes an upper mold frame (110), a split upper mold core (120) and an upper mold clamping plate (130). The upper mold core (120) includes an upper floating mold core (121) and an upper fixed mold core (122). The upper floating mold core (121) is floatingly connected to the upper mold clamping plate (130) by a first spring. The lower mold (200) includes a lower mold frame (210), a split lower mold core (220) and a lower mold clamping plate (230). The lower mold core (220) includes a lower floating mold core (221) and a lower fixed mold core (222). The lower floating mold core (221) is floatingly connected to the lower mold clamping plate (230) by a second spring. The inner lining core (300) is driven by a cylinder (500) to move left and right, and is elastically connected to the inner lining core guide seat (310) through a third spring to float up and down.

2. The mold according to claim 1, characterized in that, The left and right movement path of the inner lining core (300) is perpendicular to the pressing direction of the upper mold core (120), and the surface of the inner lining core (300) is provided with an anti-stick coating.

3. The mold according to claim 1, characterized in that, The floating stroke range of the upper floating mold core (121) and the lower floating mold core (221) is 5-20mm.

4. The mold according to claim 1, characterized in that, It also includes a sensing control system, which includes: A contact-type inductive switch is provided in the blank placement area of ​​the lower mold core (220); A control valve, connected to the cylinder, is used to receive signals from the contact-type inductive switch and control the ejection or retraction of the inner liner core (300).

5. The mold according to claim 4, characterized in that, The contact-type inductive switch is one of photoelectric, pressure, or displacement sensors.

6. The mold according to claim 1, characterized in that, A linear bearing is provided between the guide post (400) and the upper mold frame (110), and the forming accuracy of the hydraulic cylinder is ±0.1mm.

7. The mold according to claim 1, characterized in that, The inner lining core guide seat (310) is provided with a sliding guide rail (320), and the inner lining core (300) can move horizontally through the sliding guide rail (320).

8. The mold according to claim 1, characterized in that, The third spring is one of a disc spring, a helical spring, or a gas spring, and the vertical floating stroke of the inner liner core (300) is 2-10mm.

9. The mold according to claim 1, characterized in that, The cylinder (500) can be replaced by an electric push rod, a hydraulic cylinder, or a lead screw mechanism driven by a servo motor.

10. The mold according to claim 1, characterized in that, The mold is used for flattening round pipe fittings, partially forming irregularly shaped pipe fittings, or stamping thin-walled parts.

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