A convex ring stamping forming device

Abstract

The present invention discloses a convex ring stamping forming device, including a lower die, a floating part, a die opening assembly and an upper die assembly, wherein the lower die is fixedly arranged on a bottom plate, a first punching hole matching the inner diameter of a pipe is arranged on the top of the lower die, a floating part surrounds the lower die, a plurality of die opening assemblies penetrate the floating part in a radial direction, the die opening assemblies are combined above the lower die to form a second punching hole matching the outer diameter of the pipe, a ring-shaped forming cavity is arranged on the side wall of the second punching hole, the upper die assembly includes a first punch and a second punch, the second punch is slidably arranged in the first punch, the second punch includes an inner punching part matching the first punching hole and an outer pressure part matching the second punching hole, the first punch is arranged corresponding to the floating part, and a punching head corresponding to the second punch is arranged in the first punch. The present invention adopts a three-plate stamping die, and uses mechanical cooperation to open the die, which is convenient for taking and releasing materials of the pipe, has a simple structure, reliable operation and a long service life.

Description

Technical Field

[0001] The invention relates to the technical field of mold design and manufacturing, and in particular to a convex ring stamping forming device. Background Art

[0002] It is often necessary to process convex rings on metal pipes to meet different usage requirements. Currently, stamping is mainly used for this purpose. However, in this method, since the die and the pier are two separate components, it is difficult to ensure that they are on the same central axis during the actual working process. This can easily cause different wall thicknesses at different parts of the pipe, that is, uneven pipe wall thickness. During the deformation of the pipe, excessive stress is generated locally, resulting in cracking or explosion of the pipe, which causes the scrapping of raw materials or dents in the pipe wall. The deformation tolerance of the product is difficult to control, the production and processing efficiency is low, and the labor intensity is high. At the same time, the convex ring stamping device in the prior art is only suitable for pipes with consistent diameters. Pipes with inconsistent diameters cannot be processed. Even if they can be processed, it is very inconvenient to take and put the pipe.

[0003] Therefore, there is an urgent need for a device that can perform convex ring processing on pipes with inconsistent pipe diameters. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a convex ring stamping forming device, which adopts a three-plate stamping die and uses mechanical cooperation to open the die, which is convenient for taking and placing pipes, has a simple structure, reliable operation and a long service life.

[0005] In order to solve the above technical problems, the present invention provides a convex ring stamping and forming device, including a lower die, a floating part, an opening die assembly and an upper die assembly, the lower die is fixedly arranged on a bottom plate, the top of the lower die is provided with a first punching hole matching the inner diameter of the tube, the floating part surrounds the lower die, a plurality of the opening die assemblies radially penetrate the floating part, the opening die assemblies are combined above the lower die to form a second punching hole matching the outer diameter of the tube, the side wall of the second punching hole is provided with an annular forming cavity, the upper die assembly includes a first punch and a second punch, the second punch is slidably arranged in the first punch, the second punch includes an inner punching part matching the first punching hole and an outer pressure part matching the second punching hole, the first punch is arranged corresponding to the floating part, and a punching head corresponding to the second punch is arranged in the first punch.

[0006] Furthermore, the mold opening assembly includes a mold sleeve, a slider and a template, the mold sleeve is fixedly connected to the base plate outside the floating part, the template radially penetrates the floating part, the slider is fixedly connected to the outer end of the template, and a first guide groove is provided on the slider, and a pin provided on the mold sleeve passes through the first guide groove.

[0007] Furthermore, the first guide groove includes a lower inclined section inclined inwardly and downwardly and an upper straight section arranged vertically.

[0008] Furthermore, a reset groove is radially arranged in the floating member, a reset spring is arranged in the reset groove, one end of the reset spring is fixedly connected to the floating member, and the other end is connected to the template.

[0009] Furthermore, the mold sleeve includes an upper mold sleeve and a lower mold sleeve, the lower mold sleeve is fixedly connected to the base plate, the lower mold sleeve and the upper mold sleeve are provided with corresponding connecting grooves, and the lower mold sleeve and the upper mold sleeve are fixedly connected by connecting pins inserted into the connecting grooves.

[0010] Furthermore, a plurality of second guide grooves are arranged on the floating member, and guide posts inserted into the second guide grooves are arranged on the bottom plate.

[0011] Furthermore, a third punch is provided between the first punch and the second punch, and the first punch and the third punch are provided with pin holes that match each other, and a fixing pin passes through the pin holes to fix the first punch and the third punch.

[0012] Furthermore, a movable groove is provided on the side of the second punch, a pin groove for fixing a guide pin is provided inside the first punch, the guide pin is inserted between the pin groove and the movable groove, and the second punch moves up and down within the length range of the movable groove.

[0013] Furthermore, the upper mold assembly is configured to be in a flat tenon shape.

[0014] Furthermore, four mold opening assemblies are provided, and the four mold opening assemblies are symmetrically arranged around the floating part.

[0015] Compared with the prior art, the convex ring stamping forming device of the present invention has the beneficial effect of adopting a three-plate stamping die and utilizing mechanical cooperation to open the die, which is convenient for taking and placing the pipe material, has a simple structure, reliable operation and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 is a cross-sectional view of the present invention;

[0018] Figure 3 is a schematic diagram of a floating member of the present invention;

[0019] Figure 4 It is a schematic diagram of the interior of the floating member of the present invention;

[0020] Figure 5 It is a schematic diagram of an upper mold assembly of the present invention.

[0021] Explanation of numbers in the figure: 10, lower die, 11, bottom plate, 12, first punching hole, 20, floating part, 21, guide column, 30, mold opening assembly, 31, second punching hole, 32, annular forming cavity, 33, die sleeve, 331, upper die sleeve, 332, lower die sleeve, 333, connecting pin, 34, slider, 35, template, 36, first guide groove, 361, lower inclined section, 362, upper straight section, 37, pin, 39, reset spring, 40, upper die assembly, 41, first punch, 42, second punch, 421, inner punch part, 422, outer pressure part, 43, punching head, 44, third punch, 45, fixing pin, 46, guide pin, 47, movable groove. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0023] Reference Figure 1 The figure shows a schematic diagram of an embodiment of a convex ring stamping forming device of the present invention. The forming device of the present invention comprises a lower die 10, a floating part 20, a mold opening assembly 30 and an upper die assembly 40. The lower die 10 supports the pipe, the upper die presses downward, compresses the floating part 20, and the mold opening assembly 30 is tightened to restrict the pipe, and finally the pipe forms a convex ring at a designated position around the pipe under the restriction of the mold opening assembly 30; after the stamping is completed, the upper die is reset, the floating part 20 rebounds and resets, the mold opening assembly 30 is pushed open in all directions, and the pipe is released, so that it is convenient to take out the finished product and put in the workpiece to be processed again.

[0024] Specifically, refer to Figure 2 and Figure 3The figure shows a cross-sectional view and a schematic diagram of the structure of the lower die 10 of the present invention. The lower die 10 is fixedly arranged on the bottom plate 11, and a first punching hole 12 matching the inner diameter of the pipe is arranged on the top of the lower die 10. The floating member 20 surrounds the lower die 10, and a plurality of die opening assemblies 30 radially penetrate the floating member 20. The die opening assemblies 30 are combined above the lower die 10 to form a second punching hole 31 matching the outer diameter of the pipe. The side wall of the second punching hole 31 is provided with an annular forming cavity 32. The upper die assembly 40 includes a first punch 41 and a second punch 42. The second punch 42 is slidably arranged in the first punch 41. The second punch 42 includes an inner punching portion 421 matching the first punching hole 12 and an outer pressing portion 422 matching the second punching hole 31. The first punch 41 is arranged corresponding to the floating member 20, and a punching head 43 corresponding to the second punch 42 is arranged in the first punch 41. During operation, different diameter sections of the pipe are sleeved on the lower die 10, and the lower die 10 provides support for the pipe. The pipe section to be punched with the convex ring is arranged in the second punching hole 31 formed by the die opening assembly 30. During punching, the second punch 42 is inserted into the second punching hole 31, wherein the inner punch portion 421 is inserted into the pipe and the first punching hole 12, the outer pressure portion 422 presses against the top of the pipe, and the first punch 41 presses against the floating part 20. As the upper die is continuously pressed downward, the first punch 41 compresses the floating part 20, and the second punch 42 slides toward the top of the first punch 41 until the second punch 42 abuts against the punching head 43 at the top of the first punch 41. The first punch 41 continues to press downward, and the outer pressure portion 422 punches downwardly on the pipe. Since the inside and outside of the pipe are respectively limited by the second punch 42, the die opening assembly 30 and the first punch 41, the pipe can only expand at the position of the annular forming cavity 32, that is, a convex ring is formed at the designed position.

[0025] At this time, since the convex ring protrudes outward and the diameter of other sections of the tube is different from the second punching hole 31 formed by the mold opening assembly 30, in order to enable the stamped tube to be taken out, the mold opening assembly 30 should expand outward to release the tube. In order to realize that the mold opening assembly 30 automatically opens outward when the mold is opened, the mold opening assembly 30 in this embodiment includes a mold sleeve 33, a slider 34 and a template 35. The mold sleeve 33 is fixedly connected to the bottom plate 11 outside the floating member 20, and the template 35 radially penetrates the floating member 20. The slider 34 is fixedly connected to the outer end of the template 35. The slider 34 is provided with a first guide groove 36, and a pin 37 provided on the mold sleeve 33 passes through the first guide groove 36. Since the mold sleeve 33 is fixedly connected to the bottom plate 11 and the pin 37 is arranged on the mold sleeve 33, the position of the pin 37 remains unchanged. Since the slider 34 and the template 35 penetrate the floating part 20, when the upper mold moves upward, the floating part 20 rebounds upward, pushing the slider 34 and the template 35 to move upward. During the upward movement of the slider 34, due to the limitation of the pin 37, the template 35 is driven by the slider 34 to move outward, releasing the pipe, thereby facilitating the removal of the pipe.

[0026] Furthermore, to ensure that the floating member 20 can be completely released to a free state, the first guide groove 36 includes a lower inclined section 361 that is inclined inward and downward and an upper straight section 362 that is vertically arranged. Therefore, the cooperation between the pin 37 and the first guide groove 36 will not limit the compression and relaxation of the floating member 20. To ensure that each template 35 can be tightly spliced ​​when the upper mold is pressed down, a reset groove is radially arranged inside the floating member 20, and a reset spring 39 is arranged in the reset groove. One end of the reset spring 39 is fixedly connected to the floating member 20, and the other end is connected to the template 35. The reset spring 39 pulls the diaphragm plate in the splicing direction to ensure that the template 35 is tightly spliced. Furthermore, to facilitate the assembly of various parts, the mold sleeve 33 includes an upper mold sleeve 331 and a lower mold sleeve 332. The lower mold sleeve 332 is fixedly connected to the bottom plate 11. The lower mold sleeve 332 and the upper mold sleeve 331 are provided with corresponding connecting grooves. The lower mold sleeve 332 and the upper mold sleeve 331 are fixedly connected by a connecting pin 333 inserted into the connecting groove. The lower mold sleeve 332 surrounds the floating member 20, and the upper mold sleeve 331 covers the upper part of the floating member 20. On the one hand, the lower mold sleeve 332 cooperates with the upper mold sleeve 331 to form a protection for the floating member 20, and on the other hand, the upper mold sleeve 331 forms a limit for the template 35.

[0027] Reference Figure 4 The figure shows the internal structure of the floating member 20. To ensure that the floating member 20 can shrink in the vertical direction, the floating member 20 is provided with a plurality of second guide grooves, and the bottom plate 11 is provided with guide posts 21 inserted into the second guide grooves. With the guidance of the guide posts 21, the floating member 20 can only shrink in the vertical direction. There are four mold opening assemblies 30, and the four mold opening assemblies 30 are symmetrically arranged around the floating member 20. Each mold opening assembly 30 has the same shape, which is convenient for processing and splicing.

[0028] Reference Figure 1 and Figure 5As shown, it is a schematic diagram of the upper die structure of the present invention. Since the inner diameter of the top of the floating member 20 is larger than the second punching hole 31, in order to ensure complete restriction of the pipe, in this embodiment, a third punch 44 is further provided between the first punch 41 and the second punch 42. The third punch 44 is punched between the floating member 20 and the second punch 42. To fix the third punch 44, the first punch 41 and the third punch 44 are provided with mutually matching pin holes, and a fixing pin 45 passes through the pin holes to fix the first punch 41 and the third punch 44. At the same time, in order to realize the up and down movement of the second punch 42 in the first punch 41, a movable groove 47 is provided on the side of the second punch 42, and a pin groove for fixing a guide pin 46 is provided in the first punch 41. The guide pin 46 is inserted between the pin groove and the movable groove 47, and the second punch 42 moves up and down within the length range of the movable groove 47. The relative positions of the guide pin 46 and the first punch 41 are fixed. When the second punch 42 moves up and down in the first punch 41, there is rolling friction between the guide pin 46 and the second punch 42, and the friction force is small, which ensures the smooth movement of the second punch 42. Furthermore, the upper die assembly 40 is set to a flat tenon shape, so that the punching force is more concentrated.

[0029] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A convex ring stamping forming device, characterized in that: It comprises a lower die, a floating part, an opening die assembly and an upper die assembly, wherein the lower die is fixedly arranged on a bottom plate, a first punching hole matching the inner diameter of the pipe is arranged on the top of the lower die, the floating part surrounds the lower die, a plurality of the opening die assemblies penetrate the floating part in a radial direction, the opening die assemblies are combined above the lower die to form a second punching hole matching the outer diameter of the pipe, the side wall of the second punching hole is provided with an annular forming cavity, the upper die assembly comprises a first punch and a second punch, the second punch is slidably arranged in the first punch, the second punch comprises an inner punching portion matching the first punching hole and an outer pressing portion matching the second punching hole, the first punch is arranged corresponding to the floating part, and a punching head corresponding to the second punch is arranged in the first punch; The mold opening assembly includes a mold sleeve, a slider and a template, the mold sleeve is fixedly connected to the bottom plate outside the floating member, the template radially penetrates the floating member, the slider is fixedly connected to the outer end of the template, the slider is provided with a first guide groove, and the pin provided on the mold sleeve passes through the first guide groove; The floating member is provided with a plurality of second guide grooves, and the bottom plate is provided with guide columns inserted into the second guide grooves.

2. A convex ring stamping forming device as claimed in claim 1, characterized in that: The first guide groove includes a lower inclined section inclined inwardly and downwardly and an upper straight section arranged vertically.

3. A convex ring stamping forming device as claimed in claim 1, characterized in that: A reset groove is radially arranged in the floating member, and a reset spring is arranged in the reset groove. One end of the reset spring is fixedly connected to the floating member, and the other end is connected to the template.

4. A convex ring stamping forming device as claimed in claim 1, characterized in that: The mold sleeve includes an upper mold sleeve and a lower mold sleeve, the lower mold sleeve is fixedly connected to the bottom plate, the lower mold sleeve and the upper mold sleeve are provided with corresponding connecting grooves, and the lower mold sleeve and the upper mold sleeve are fixedly connected by connecting pins inserted into the connecting grooves.

5. A convex ring stamping forming device as claimed in claim 1, characterized in that: A third punch is further arranged between the first punch and the second punch. The first punch and the third punch are provided with pin holes that match each other. A fixing pin passes through the pin holes to fix the first punch and the third punch.

6. A convex ring stamping forming device as claimed in claim 1, characterized in that: A movable groove is arranged on the side of the second punch, a pin groove for fixing a guide pin is arranged inside the first punch, the guide pin is inserted between the pin groove and the movable groove, and the second punch moves up and down within the length range of the movable groove.

7. A convex ring stamping forming device as claimed in claim 1, characterized in that: The upper die assembly is configured to be in a flat tenon shape.

8. A convex ring stamping forming device as claimed in claim 1, characterized in that: There are four mold opening assemblies, and the four mold opening assemblies are symmetrically arranged around the floating part.

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