A delayed ejection device

Abstract

The present invention provides a delayed ejection device, including an upper mold assembly and a lower mold assembly, the upper mold assembly includes a punch fixing structure and a material pressing structure elastically connected in parallel from top to bottom, an upper nitrogen spring is arranged between the punch fixing structure and the material pressing structure, and the lower mold assembly is provided with an external force transmission rod and an internal force transmission rod vertically and parallelly arranged inside the lower mold assembly, and the internal force transmission rod is provided with a pair of external force transmission rods, the top of the pair of internal force transmission rods contacts the slider, and the bottom contacts the plate-beating structure, and the lower nitrogen spring is sleeved on the external force transmission rod; the plate-beating structure is installed on the side of the lower mold assembly away from the upper mold assembly, and the side of the plate-beating structure is penetrated by a side plate, and the side plate slides left and right in the plate-beating structure groove under the action of the cylinder. The present invention has an ingenious structure, sensitive operation, matches the running speed of the mold, and can provide back pressure and delay ejection. It is a low-priced and simple-structured delayed ejection device.

Description

Technical Field

[0001] The invention mainly relates to the field of thin plate blanking, and in particular to a delayed ejection device. Background Art

[0002] This structure is designed for thin plate blanking, and has very high requirements on the flatness and dimensional tolerance of the final product. This structure is used in the blanking process of thin plate blanking. For thick plate blanking or blanking processes that do not have very high dimensional requirements, direct blanking is often used. During the blanking process, the mold does not need to provide reverse back pressure to the part. Such parts often receive the action of unidirectional blanking force and the surface will be slightly arched. When blanking thin materials or irregularly shaped parts, this arch will be particularly prominent, thereby affecting the flatness of the part and some other related dimensional accuracy.

[0003] Therefore, back pressure is often used in the stamping process of this type of parts, and the ejection needs to be delayed, that is, the parts can only be ejected when the punch is disengaged from the sheet and the material leaves the die side. Otherwise, the parts will be pressed back and embedded in the sheet, affecting the appearance quality of the parts and also affecting continuous safe production. Therefore, the industry often uses hydraulic or pneumatic methods with electrical control to complete this process, but this method is expensive, and the ejection speed is often very difficult to control. If the speed is too fast, abnormal noise will be generated and even the life of the mold will be affected. If the speed is too slow, the parts cannot be ejected in time, affecting the production rhythm.

[0004] Therefore, it is necessary to develop a mold structure with low cost, suitable response speed and complete functions.

[0005] The Chinese utility model patent has been published, application number CN201820879455.9, patent name: A mold delayed ejection device for reducing deformation, application date: 2018-06-07, the present invention relates to a mold delayed ejection device for reducing deformation, comprising an ejector reset rod and a mold bottom plate, the bottom end of the ejector reset rod passes through the guide through hole of the mold bottom plate and is fixed with an ejector cover plate, the bottom surface of the ejector cover plate is fixed with a common ejector fixing plate, the top surface of the ejector cover plate is formed with at least one stepped through hole, the stepped through hole The diameter of the upper section of the through hole is smaller than that of the lower section, the delayed ejector is inserted into the stepped through hole, and the delayed ejector block provided at the bottom end of the delayed ejector is inserted into the lower section of the stepped through hole, and a gap is formed between the top surface of the delayed ejector block and the top surface of the lower section of the stepped through hole; when ejecting the mold product, it can first eject the part of the product with a large holding force, and delay the ejection of the part with a small holding force, so that the deformation of the mold product after ejection is within a reasonable range, thereby improving the quality stability of the die-casting products and reducing the scrap rate in processing and assembly. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a delayed ejection device which is matched with the running speed of the mold, can provide back pressure and delay ejection, has a low price and a simple structure, comprises an upper mold assembly and a lower mold assembly, the upper mold assembly comprises a punch fixing structure 1 and a material pressing structure 2 which are elastically connected in parallel from top to bottom, an upper nitrogen spring 3 is arranged between the punch fixing structure 1 and the material pressing structure 2,

[0007] The lower mold assembly is provided with an outer force transfer rod 4 and an inner force transfer rod 5 vertically and parallelly arranged inside, and the inner force transfer rod 5 is provided with a pair of the outer force transfer rods 4, the top of the pair of inner force transfer rods 5 contacts the slider 6, and the bottom contacts the plate structure 7, and the outer force transfer rod 4 is sleeved with a lower nitrogen spring 8;

[0008] A beating plate structure 7 is installed on the side of the lower mold assembly away from the upper mold assembly, and a side plate 9 is penetrated through the side of the beating plate structure 7. The side plate 9 slides left and right in the groove of the beating plate structure 7 under the action of the cylinder.

[0009] Preferably, the plate-beating structure 7 comprises an upper plate-beating plate 701 and a lower plate-beating plate 702, wherein the upper plate-beating plate 701 and the lower plate-beating plate 702 are connected via a discharge screw 10, and a plate-beating nitrogen spring 11 is sleeved on the discharge screw 10;

[0010] A guide groove 12 is provided on the side of the upper plate 701 , and a hole 14 is provided on the guide groove corresponding to the through hole 13 of the side plate.

[0011] Preferably, a limiting nail 15 is installed on the side plate 9, and a pair of the limiting nails 15 are arranged up and down on the left and right sides of the column of the plate structure 7, and the side of the side plate 9 close to the upper plate 701 is transported to the hole 14.

[0012] Preferably, the outer force transmission rod 4 consists of two parts, an upper part and an lower part, and a lower nitrogen spring 8 is sleeved on the lower part of the outer force transmission rod 4 .

[0013] Preferably, the punch fixing structure 1 includes an upper die base 101, an upper pad 102, and an upper fixing plate 103 which are elastically connected in parallel from top to bottom to form an upper half that can move in time with the press. A punch 16 is fixedly installed on one side of the upper die base 101 close to the upper pad 102, and the punch 16 passes through the punch fixing structure 1.

[0014] Preferably, a side of the punch 16 away from the punch fixing structure 1 is also penetrated by a material pressing structure 2, and the material pressing structure 2 includes a discharge pad 4 and a discharge plate 5 fixed from top to bottom to form a buffer section.

[0015] Preferably, the force of the upper nitrogen spring 3 is greater than that of the lower nitrogen spring 8 .

[0016] The invention has the following beneficial effects: ingenious structure, sensitive operation, matching with the running speed of the mold, capable of providing back pressure and delayed ejection, and is a low-cost and simple-structured delayed ejection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of step 1 of this embodiment;

[0018] Figure 2 This is a structural diagram of step 2 of this embodiment;

[0019] Figure 3 This is a structural diagram of step 3 of this embodiment;

[0020] Figure 4 This is a structural diagram of step 4 of this embodiment;

[0021] Figure 5 This is a structural diagram of step 5 of this embodiment;

[0022] Figure 6 This is a structural diagram of step 6 of this embodiment;

[0023] Figure 7 This is a structural diagram of step 7 of this embodiment;

[0024] Figure 8 This is a structural diagram of step 8 of this embodiment;

[0025] Fig. 9 This is a structural diagram of step 9 of this embodiment;

[0026] In the figure,

[0027] 1. Punch fixing structure, 101, upper die seat, 102, upper pad, 103, upper fixing plate; 2. Material pressing structure; 3. Upper nitrogen spring; 4. External force transfer rod; 5. Internal force transfer rod; 6. Slider; 7. Plate hitting structure, 701, upper plate hitting, 702, lower plate hitting; 8. Lower nitrogen spring; 9. Side plate; 10. Unloading screw; 11. Plate hitting nitrogen spring; 12. Guide groove; 13. Hole; 14. Through hole; 15. Limit pin; 16. Punch; 17. Raw materials. DETAILED DESCRIPTION

[0028] In order to make the technical solution of the present invention better understood by the technical personnel in the field, and to make the above-mentioned features, purposes and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with the embodiments. The embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0029] like Figure 1-9As shown, the present invention includes: an upper die assembly and a lower die assembly, wherein the upper die assembly includes a punch fixing structure 1 and a material pressing structure 2 which are elastically connected in parallel from top to bottom, and an upper nitrogen spring 3 is arranged between the punch fixing structure 1 and the material pressing structure 2.

[0030] The lower mold assembly is provided with an outer force transfer rod 4 and an inner force transfer rod 5 vertically and parallelly arranged inside, and the inner force transfer rod 5 is provided with a pair of the outer force transfer rods 4, the top of the pair of inner force transfer rods 5 contacts the slider 6, and the bottom contacts the plate structure 7, and the outer force transfer rod 4 is sleeved with a lower nitrogen spring 8;

[0031] A beating plate structure 7 is installed on the side of the lower mold assembly away from the upper mold assembly, and a side plate 9 is penetrated through the side of the beating plate structure 7. The side plate 9 slides left and right in the groove of the beating plate structure 7 under the action of the cylinder.

[0032] In this embodiment, the plate-beating structure 7 preferably includes an upper plate-beating plate 701 and a lower plate-beating plate 702, wherein the upper plate-beating plate 701 and the lower plate-beating plate 702 are connected by a discharge screw 10, and a plate-beating nitrogen spring 11 is sleeved on the discharge screw 10;

[0033] A guide groove 12 is disposed on the side of the upper plate 701 , and a hole 14 is disposed on the guide groove 12 corresponding to the through hole 13 of the side plate.

[0034] The above structure is set up, and the plate structure is divided into upper and lower plates, the upper plate is provided with guide grooves and holes, and the upper and lower plates are connected by springs and unloading screws.

[0035] In this embodiment, preferably, a limiting nail 15 is installed on the side plate 9, and a pair of the limiting nails 15 are arranged up and down on the left and right sides of the column of the plate structure 7, and the side of the side plate 9 close to the upper plate 701 is transported to the hole 14.

[0036] The above structure is set up, and two limiting nails and a circular hole are arranged on the side plate, and the side plate can slide left and right in the groove of the upper hitting plate under the action of the cylinder.

[0037] In the present embodiment, the outer force transmission rod 4 is preferably composed of an upper and lower part, and a lower nitrogen spring 8 is sleeved on the lower part of the outer force transmission rod 4 .

[0038] With the above structure, the outer force transmission rod is composed of two parts, and a spring is arranged on the lower force transmission rod. Under normal conditions, the spring keeps it at the upper dead center position.

[0039] In this embodiment, the punch fixing structure 1 preferably includes an upper die base 101, an upper pad 102, and an upper fixing plate 103 which are elastically connected in parallel from top to bottom to form an upper half that can move in time with the press. A punch 16 is fixedly installed on one side of the upper die base 101 close to the upper pad 102, and the punch 16 passes through the punch fixing structure 1.

[0040] In this embodiment, preferably, a side of the punch 16 away from the punch fixing structure 1 is also penetrated by a material pressing structure 2, and the material pressing structure 2 includes a discharge pad 4 and a discharge plate 5 fixed from top to bottom to form a buffer section.

[0041] In this embodiment, preferably, the force of the upper nitrogen spring 3 is greater than that of the lower nitrogen spring 8 .

[0042] In use, the following movements are included:

[0043] Step 1. Initial position:

[0044] The side panel is at the far left, and the inner and outer force transmission rods, the hitting plate, and the slider are all at the top dead center;

[0045] Step 2. Downward, outer force transfer rod contact:

[0046] The downward discharge plate of the upper die part contacts the outer force transmission rod;

[0047] Step 3. Go down. Since the nitrogen spring force above is much greater than the reset spring force of the force transfer rod, the outer force transfer rod compresses the spring under the action of the unloading plate and passes through the circular hole of the side plate to the bottom dead center. At this time, the unloading plate is also at the bottom dead center.

[0048] Step 4. Go down, punch, separate the raw materials. During the material separation process, the lower slider always gives the parts an upward back pressure under the action of the lower punching plate. The punch and the parts compress the lower single-plate spring to move downward until the punching stroke ends;

[0049] Step 5. The side plate moves to the right: At this time, the upper hitting plate and the slider are both at the bottom dead center. The side plate moves to the right under the action of the cylinder and reaches the right dead center position under the action of the limit stop.

[0050] Step 6. Open the mold, and the side plate contacts the external force transfer rod: As the side plate moves to the right, the original hole and the external force transfer rod are offset. During the upward process, the upper plate moves upward with the mold, carrying the side plate upward and contacting the external force transfer rod;

[0051] Step 7. Continue to open the mold: During the process of continuing to open the mold, since the force of the upper nitrogen spring is much greater than the force of the plate reset spring, even if the punch continues to move upward before the punching stroke is reset, the part will not move upward until the punching stroke is completed;

[0052] Step 8. Continue to open the mold: the raw material and the unloading plate are separated from the lower mold part, and the outer force transmission rod, the inner force transmission rod and the punching plate move upward together to push out the blanked parts and reach the top dead center to complete the reset, realizing the delayed ejection function;

[0053] Step 9. Move the side panel to the left and reset:

[0054] This cycle is repeated to complete the subsequent blanking process.

[0055] The above embodiments are merely illustrative of the principles and effects of this patent application, and are not intended to limit this patent application. Anyone familiar with this technology can modify or change the above embodiments without violating the spirit and scope of this patent application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in this patent application should still be covered by the claims of this patent application.

Claims

1. A delayed ejection device, characterized in that: The invention comprises an upper die assembly and a lower die assembly, wherein the upper die assembly comprises a punch fixing structure (1) and a material pressing structure (2) which are elastically connected in parallel from top to bottom, and an upper nitrogen spring (3) is arranged between the punch fixing structure (1) and the material pressing structure (2). The lower die assembly is provided with an outer force transmission rod (4) and an inner force transmission rod (5) which are arranged vertically and in parallel. The inner force transmission rod (5) is arranged between a pair of the outer force transmission rods (4). The top of the pair of the inner force transmission rods (5) contacts the slider (6) and the bottom contacts the plate structure (7). The outer force transmission rod (4) is sleeved with a lower nitrogen spring (8). A beating plate structure (7) is installed on the side of the lower mold assembly away from the upper mold assembly, and a side plate (9) is penetrated through the side of the beating plate structure (7). The side plate (9) slides left and right in the groove of the beating plate structure (7) under the action of the cylinder; The beating plate structure (7) comprises an upper beating plate (701) and a lower beating plate (702), wherein the upper beating plate (701) and the lower beating plate (702) are connected via a discharge screw (10), and a beating plate nitrogen spring (11) is sleeved on the discharge screw (10); A guide groove (12) is provided on the side of the upper punching plate (701), and a hole (14) is provided on the guide groove corresponding to the through hole (13) of the side plate, and the side of the side plate (9) close to the upper punching plate (701) is transported to the hole (14); in the initial position, the side plate (9) is at the leftmost side, the inner force transmission rod (5), the outer force transmission rod (4), the upper punching plate (701), and the slide block (6) are all at the upper dead point, and when the punching stroke ends, the upper punching plate (701) and the slide block (6) are all at the lower dead point, and the side plate (9) moves to the right to reach the right dead point position, and the original The hole (14) is staggered with the outer force transfer rod (4). During the upward movement of the punch (16), the upper punch plate moves upward with it, and moves the side plate (9) upward and contacts the outer force transfer rod (4), and the mold continues to be opened. Before the punching stroke is reset, even if the punch (16) continues to move upward, the punched part will not move upward with it. Until the punching stroke mold opening is completed, the mold continues to be opened, the raw material (17) and the unloading plate are separated from the lower die assembly, and the outer force transfer rod (4), the inner force transfer rod (5) and the upper punch plate (701) move upward together to push out the punched part and reach the top dead center to complete the reset, thereby realizing the delayed ejection function; The side plate (9) is provided with a limit pin (15), and a pair of the limit pins (15) are arranged vertically on the left and right sides of the column of the plate-beating structure (7); The outer force transmission rod (4) is composed of an upper and lower part, and a lower nitrogen spring (8) is sleeved on the lower part of the outer force transmission rod (4); The force of the upper nitrogen spring (3) is greater than that of the lower nitrogen spring (8).

2. The delayed ejection device according to claim 1, characterized in that: The punch fixing structure (1) comprises an upper die base (101), an upper pad (102), and an upper fixing plate (103) which are elastically connected in parallel from top to bottom to form an upper half that can move in time with the press machine. A punch (16) is fixedly mounted on one side of the upper die base (101) close to the upper pad (102), and the punch (16) passes through the punch fixing structure (1).

3. The delayed ejection device according to claim 1, characterized in that: A material pressing structure (2) is also provided on the side of the punch (16) away from the punch fixing structure (1), and the material pressing structure (2) comprises a material unloading pad and a material unloading plate fixed from top to bottom to form a buffer section.

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