Necking Die for Processing Water Sealing Neck and Necking Processing Method

Abstract

The present invention discloses a necking die and a necking processing method for processing a water sealing neck that can meet the processing requirements of water sealing necks with different depths and reduce the scrap rate. The necking die includes a die base, a universal joint, a connecting rod, a synchronous die and a positioning die; a receiving hole is provided in the middle of the die base, and a through groove is provided at the center of the upper part of the die base; the universal joint is placed in the receiving hole, and the connecting rod is placed in the through groove; one end of the universal joint is fixed to the middle of the connecting rod, and the other end is fixed to the center of the bottom of the die base; the synchronous die is located above the connecting rod, and the center of the connecting rod is coaxial with the center of the synchronous die; the positioning die is arranged above the synchronous die, the lower part of the positioning die passes through and is fixedly connected, and is coaxial with the die base; a groove ring for processing the water sealing neck is formed between the upper port of the synchronous die and the upper part of the positioning die; during processing, the synchronous die rotates eccentrically and synchronously, which can form a deeper water sealing neck forming effect while ensuring the ejection of the workpiece. The movement of the synchronous die in the radial direction also avoids the workpiece from slipping and stopping rotating, so that the water sealing neck can meet the preset requirements while ensuring the processing quality.

Description

Technical Field

[0001] The present invention relates to a workpiece processing machine and equipment, in particular to a necking die and a necking processing method for processing the water sealing neck of an inner container. Background Art

[0002] For existing metal cups, such as stainless steel vacuum cups, a relatively common water sealing structure is that the cup lid sealing ring cooperates with the water sealing neck at the cup mouth neck to seal water. This requires using a special necking die at the mouth of the inner container of the cup to perform necking processing to form the water sealing neck. The commonly used necking die is a concave die with a groove at a corresponding position. During processing, the workpiece to be processed is sleeved outside the die, the power shaft rotates the die, and at the same time drives the workpiece to rotate. Then, the cutter wheel is brought closer, and in cooperation with the groove of the die, a water sealing neck is formed at the corresponding position of the workpiece.

[0003] For example, CN 203030701U discloses a die for processing the water sealing neck of a vacuum cup, which includes a lower template fixed on the workbench of a necking machine. A die shank is connected to the lower template, a stop block is connected to the die shank, and a water sealing neck die is connected to the stop block. For example, CN206952012U discloses an efficient automatic necking die case, which includes a top head, a die head, a shaft, a tailstock, and a bottom plate. The die head is fixed at the upper end of the shaft through an inner hexagon screw. The lower end of the shaft is integrally connected to the bottom plate by welding and is fixed on the chassis of a numerical control necking machine through an inner hexagon screw. The top head is placed with a bearing and installed on the ejector rod of the numerical control necking machine and is concentric with the shaft. The top head is located above the die head and is driven by a servo motor to move up and down. The tailstock is sleeved on the shaft, and a spring is installed between the lower end of the tailstock and the lower end of the shaft. The workpiece is placed between the die head and the tailstock, and the upper port of the workpiece is sleeved with the lower end of the top head during processing.

[0004] When using the above-mentioned necking die to process the water sealing neck, the water sealing neck is processed through the groove and the cutter wheel in the necking die, but there are still several problems: First, when processing different water sealing necks, different necking dies need to be replaced, and the disassembly and installation are very time-consuming and laborious. Second, due to the rigidity of metal materials such as stainless steel, the depth of the formed water sealing neck often fails to meet the requirements. If the groove of the necking die is designed deeper to achieve a deeper water sealing neck, due to the ductility limitation of metal materials such as stainless steel, holes are likely to appear in the relative position of the workpiece, resulting in scrap. Third, the collision between the cutter wheel and the necking die is rigid. The workpiece is driven by the die to rotate. During the processing, when the cutter wheel feeds, the workpiece and the necking die slip, easily causing the workpiece to stop moving and resulting in scrap. Summary of the Invention

[0005] The purpose of the present invention is to provide a necking die and a necking processing method for processing the water sealing neck, which can meet the processing of water sealing necks with different depths and reduce the scrap rate.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] Technical solution 1: A necking die for processing a water sealing neck, which comprises a die base, a universal joint, a connecting rod, a synchronous die and a positioning die; a receiving hole is provided in the middle of the die base, and a through groove is provided in the center of the upper part of the die base; the universal joint is placed in the receiving hole, and the connecting rod is placed in the through groove; one end of the universal joint is fixed to the middle of the connecting rod, and the other end is fixed to the center of the bottom of the die base; the synchronous die is located above the connecting rod, and the center of the connecting rod is coaxial with the center of the synchronous die; a convex platform extending radially outwards is provided at the lower part of the synchronous die; the positioning die is arranged above the synchronous die, the lower part of the positioning die passes through and is fixedly connected, and is coaxial with the die base; a groove ring for processing the water sealing neck is formed between the upper port part of the synchronous die and the upper part of the positioning die.

[0008] Preferably, both ends of the universal joint are square fixing blocks, a square hole matching the square fixing block is opened in the middle of the connecting rod, and a square hole matching the square fixing block is also opened in the center of the bottom of the die base.

[0009] Preferably, an inclined surface is provided at the bottom end of the upper part of the positioning die; when the synchronous die is in an eccentric state, one side of the outer side of one end of the upper part of the synchronous die is flush with one side of the lower end surface of the upper part of the positioning die.

[0010] Preferably, two connecting holes are symmetrically provided on the connecting rod, and the synchronous die is connected and fixed to the connecting rod through the two connecting holes.

[0011] Preferably, on the die base, screw holes are symmetrically opened on both sides of the through groove; positioning holes corresponding to the screw holes on the die base are provided on the positioning die, and the positioning die is connected and fixed to the die base through the positioning holes and the screw holes.

[0012] Technical solution 2: A necking processing method for processing a water sealing neck, which is processed by using the above-mentioned necking die for processing a water sealing neck, and is carried out in the following steps in sequence;

[0013] ① Connect the die base to the transmission shaft of the machine, place the universal joint in the receiving hole of the die base, and respectively fix and connect both ends of the universal joint to the bottom of the die base and the connecting rod;

[0014] ② According to the requirements of the water sealing neck of the workpiece to be processed, select the corresponding synchronous die and positioning die, and fix the synchronous die on the connecting rod;

[0015] ③ Place the workpiece to be processed on the necking die;

[0016] ④ Start the switch, the upper die head quickly descends and elastically compresses the workpiece to be processed, and the workpiece to be processed rotates synchronously with the die base;

[0017] ⑤ Start the cutter wheel. The cutter wheel feeds towards the groove ring position. Under the action of the cutter wheel, the synchronous die generates eccentricity. The workpiece to be processed forms a water-sealing neck according to the groove formed by the upper port of the synchronous die and the upper part of the positioning die.

[0018] ⑥ After the machining is completed, retract the cutter wheel. The synchronous die returns to its original state, the upper die head rises, and the workpiece is taken out.

[0019] Preferably, the cutter wheel feeding and machining in step ⑤ can be divided into two times. The first time, a rough cutter wheel is used to machine the general contour of the water-sealing neck; the second time, a fine cutter wheel is used to machine the water-sealing neck more deeply to complete the machining.

[0020] Preferably, for the two-time cutter wheel feeding and machining in step ⑤, the cutter wheels for the two times can be respectively arranged on the left and right sides of the workpiece, so that the cutter wheels on the left and right sides feed and machine in sequence.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: First, the design of the universal joint. One end of the universal joint is connected to the fixed die base, and the other end is connected to the fixed connecting rod, and is fixed to the synchronous die through the connecting rod. In this way, power is transmitted through the universal joint, and the synchronous die and the die base rotate synchronously. That is, while the synchronous die is eccentric, it can also maintain synchronous rotation with the die base. Second, the eccentric design of the synchronous die. The groove ring formed by the upper part of the synchronous die and the upper part of the positioning die is used for the machining of the water-sealing neck. The eccentric design of the synchronous die can give a deeper forming effect of the water-sealing neck and ensure the ejection of the workpiece at the same time. Third, the synchronous eccentric design of the synchronous die. The synchronous die can move radially while rotating synchronously with the die base, so as to drive the workpiece to move synchronously, increasing the friction force with the workpiece, avoiding the slipping of the workpiece, and avoiding the phenomenon that the workpiece stops rotating synchronously due to slipping, greatly reducing the machining rejection rate. Fourth, the water-sealing neck forming groove jointly formed by the synchronous die and the positioning die. On the one hand, it can adapt to the machining of the water-sealing necks of more specifications of workpieces. When machining workpieces and water-sealing necks of different specifications, only the synchronous die and the positioning die need to be replaced, and the disassembly and assembly are very convenient. On the other hand, it can also be adjusted in real time according to the situation of the cutter wheel feeding, and the depth of machining the water-sealing neck is controllable. Fifth, the method of machining the water-sealing neck using the necking die of the present technical solution. The operations of installing the die, replacing the die, and clamping the workpiece are very simple. Not only can the machined water-sealing neck meet the preset requirements, but also the quality can be guaranteed, effectively reducing the rejection rate.

[0022] Further beneficial effects: First, both ends of the universal joint are fixed with square holes, which has a lower cost, a larger stress area, stronger stability and is easier to disassemble and assemble; second, the bottom end of the upper part of the positioning die is provided with an inclined surface. When the synchronous die is in an eccentric state, one end of the outer side of the upper part of the synchronous die is flush with one side of the lower end surface of the upper die. The design of the inclined surface makes the depth and size of the water sealing neck more controllable, and at the same time, the workpiece is easier to demold; third, after the lower part of the positioning die passes through the synchronous die, it is fixedly connected to the die base through the symmetric screw holes on the die base. In this way, the positioning die not only serves as the eccentric guide of the synchronous die, but also can be fixedly connected to the die base to rotate synchronously, restricting the axial movement of the synchronous die and improving the processing yield; fourth, by adopting two processing procedures, the phenomenon of thin-walled metal cracking caused by insufficient metal ductility can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional exploded structural schematic diagram of the necking die for processing the water sealing neck of the present invention;

[0024] Figure 2 is a cross-sectional structural schematic diagram of the necking die for processing the water sealing neck of the present invention;

[0025] Figure 3 is a cross-sectional structural schematic diagram of the synchronous die;

[0026] Figure 4 is a cross-sectional structural schematic diagram of the positioning die;

[0027] Figure 5 is a structural schematic diagram of the necking die for processing the water sealing neck of the present invention in the unprocessed clamped state;

[0028] Figure 6 is a structural schematic diagram during the processing of the necking method for processing the water sealing neck using the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] In order to make the technical solutions of the present invention clearer, the following is a detailed description of the present invention with reference to the attached Figure 1-6 , which is not intended to limit the protection scope of the present invention. It should be understood that the specific embodiments described in this specification are only for explaining the present invention.

[0030] Referring to the attached Figure 1 , 2。A necking die for processing a water sealing neck, which comprises a die base 1, a universal joint 2, a connecting rod 3, a synchronous die 4 and a positioning die 5; the die base 1 is fixedly connected to the machine transmission shaft, and the connection structures of the machine, the transmission shaft, and the transmission shaft and the die base 1 are all prior arts and will not be elaborated here; a receiving hole 10 is provided in the middle of the die base 1, a square hole is provided at the center of the bottom of the receiving hole 10 of the die base 1, and a through groove 11 is provided at the center of the upper part of the die base 1, that is, the through groove 11 is radially opened on the die base 1; the universal joint 2 is placed in the receiving hole 10, and the connecting rod 3 is placed in the through groove 11; the universal joint 2 is an existing spare part with a wide variety of types. Here, taking the two ends of the universal joint 2 being square fixing blocks as an example, one end of the universal joint 2 is fixedly connected to the middle of the connecting rod 3, and the other end is fixed in the through hole 13 at the center of the bottom of the die base 1 and the through hole 13 is a square hole, that is, the middle of the connecting rod 3 and the through holes 13 and 30 at the center of the bottom of the die base 1 are all square holes and are fixedly matched with the square fixing blocks of the universal joint 2; the synchronous die 4 is located above the connecting rod 3, and the center of the connecting rod 3 is coaxial with the center of the synchronous die 4. Two connecting holes 31 are symmetrically provided on the connecting rod 3, and the synchronous die 4 is connected and fixed to the connecting rod 3 through the two connecting holes 31, which can be a screw connection; a convex platform 40 extending radially outward is provided at the lower part of the synchronous die 4; the positioning die 5 is generally T-shaped, the upper part of the positioning die 5 is arranged above the synchronous die 4, and the bottom surface of the upper part of the positioning die 5 is in contact with the top surface of the synchronous die 4; the synchronous die 4 is a hollow structure, the lower part of the positioning die 5 passes through the synchronous die 4 and is fixedly connected to the die base 1, and the positioning die 5 is coaxial with the die base 1. Specifically, two symmetrically arranged screw holes 12 are provided on the die base 1, and the two screw holes 12 can be arranged on both sides of the through groove 11. The positioning die 5 is provided with positioning holes 50 that cooperate with the two screw holes 12. After the lower part of the positioning die 5 passes through the synchronous die 4, the screw holes 12 and the positioning holes 50 are connected by screws or bolts, etc., and then the positioning die 5 and the die base 1 are connected and fixed.

[0031] The upper port part of the above-mentioned synchronous die 4 and the upper part of the positioning die 5 form a groove ring 6 for processing the water sealing neck; specifically, referring to the attached Figure 3 , the synchronous die 4 is a cylindrical shape with gradually increasing diameters from top to middle to bottom. The middle part of the synchronous die 4 is empty and its inner diameter is d1. The outer diameter of the upper end of the synchronous die 4 is D1, the outer diameter of the middle part is D2, and the outer diameter of the lower part, that is, the outer diameter of the convex platform 40, is D3. Then D3 > D2 > D1 > d1. The connection between the outer diameters of the upper part and the middle part is an arc surface; referring to the attached Figure 4 , the positioning die 5 is generally T-shaped. The outer diameter of the lower part of the positioning die 5 is d2, the outer diameter of the upper part is d3, and the diameter of the lower end surface of the upper part is d4. The connection between the lower end surface of the upper part of the positioning die 5 and the outer diameter of the upper part is an inclined surface. Then D2 > d3 > D1 > d4 > d1 > d2.

[0032] During processing, when the synchronous die 4 is in an eccentric state, the outer side of one end of the upper part of the synchronous die 4 is flush with one side of the lower end surface of the upper part of the positioning die 5. At this time, the groove formed by the positioning die 5 and the synchronous die 4 is the deepest, that is, a deeper water sealing neck can be processed at this time. The eccentric design of the synchronous die 4 can not only process a deeper water sealing neck, but also the synchronous die 4 can move radially. The synchronous die 4 drives the workpiece to synchronously shift, which can increase the friction force with the workpiece, avoid the workpiece from slipping and stopping synchronous rotation, and greatly reduce the processing rejection rate. In addition, the pre-processing specifications of the water sealing neck of the workpiece are mainly determined by the groove formed by the synchronous die 4 and the positioning die 5, and the size of the workpiece is mainly determined by the outer diameter of the synchronous die 4. Therefore, when processing different workpieces, different water sealing neck sizes can be achieved by simply replacing the synchronous die 4 and the positioning die 5, and the disassembly and installation are very convenient, with strong practicability; and the depth of the water sealing neck can also be freely controlled by controlling the feed depth of the cutter wheel, with stronger applicability; for the necking die adopting this technical solution, the water sealing neck can meet the preset requirements while ensuring the quality.

[0033] Refer to the attached Figure 5 、 6 。Technical solution 2: A necking processing method for processing a water sealing neck, which is processed by using the above-mentioned necking die for processing a water sealing neck, and is carried out in the following steps in sequence;

[0034] ① Connect the die holder 1 to the transmission shaft of the machine, place the universal joint 2 in the accommodating hole 10 of the die holder 1, and fixedly connect the two ends of the universal joint 2 to the bottom of the die holder 1 and the connecting rod 3 respectively;

[0035] ② According to the requirements of the water sealing neck of the workpiece to be processed, select the corresponding synchronous die 4 and positioning die 5, and fix the synchronous die 4 on the connecting rod 3;

[0036] ③ Place the workpiece 100 to be processed on the necking die. The workpiece 100 to be processed is placed upside down and buckled on the synchronous die 4, that is, the workpiece 100 to be processed is placed on the convex platform 40 of the synchronous die 4, and the outer diameter of the middle part of the synchronous die 4 is determined by the caliber of the workpiece 100 to be processed;

[0037] ④ Start the switch, the top head 8 of the upper die 7 quickly descends and elastically presses the workpiece 100 to be processed, and the workpiece 100 to be processed rotates synchronously with the die holder 1;

[0038] ⑤ Start the left cutter wheel. The left cutter wheel is a rough cutter wheel. The left cutter wheel feeds towards the groove ring 6 position to pre-process the workpiece. Under the action of the cutter wheel, the synchronous die 4 generates eccentric movement, and the workpiece 100 to be processed moves synchronously. And the workpiece 100 to be processed forms a rough contour of the water sealing neck according to the groove formed by the upper port part of the synchronous die 4 and the upper part of the positioning die 5;

[0039] ⑥Start the right cutter wheel. The right cutter wheel is a fine cutter wheel. The right cutter wheel feeds into the position of the groove ring 6 to perform finish machining on the workpiece. Under the action of the cutter wheel, the synchronous die 4 generates eccentric movement, and the workpiece to be machined 100 moves synchronously. And the workpiece to be machined 100 is processed in accordance with the groove formed by the upper port of the synchronous die 4 and the upper part of the positioning die 5, that is, the right cutter wheel further deeply processes to complete the machining of the water sealing neck.

[0040] ⑦After the machining is completed, retract the tool, the synchronous die 4 is restored, and the ejector head 8 of the upper die 7 rises to take out the workpiece.

[0041] If the workpiece to be machined is produced by the conventional hydroforming process, the method of two - stage machining may not be adopted, and it can be directly formed in one - stage machining; if the workpiece to be machined is produced by the stretching process, then the workpiece itself has already extended a lot after stretching, and its performance of continuing to extend is relatively poor. If it is necked down in one - stage machining, it is very easy to be damaged. By machining in two stages, it can be successfully machined in place. While being able to machine a deeper water sealing neck, no damage will occur, greatly improving the necking success rate and effectively reducing the machining scrap rate.

Claims

1. A necking die for processing a water sealing neck, characterized in that: it includes a die base (1), a universal joint (2), a connecting rod (3), a synchronous die (4) and a positioning die (5); a receiving hole (10) is provided in the middle of the die base (1), and a through groove (11) is provided in the center of the upper part of the die base (1); the universal joint (2) is placed in the receiving hole (10), and the connecting rod (3) is placed in the through groove (11); one end of the universal joint (2) is fixed to the middle of the connecting rod (3), and the other end is fixed to the center of the bottom of the die base (1); the synchronous die (4) is located above the connecting rod (3), and the center of the connecting rod (3) is coaxial with the center of the synchronous die (4); a convex platform (40) extending radially outward is provided at the lower part of the synchronous die (4); the synchronous die (4) is a cylindrical shape with gradually increasing diameters from top to middle to bottom, the outer diameter of the upper end is D1, the outer diameter of the middle part is D2, and the outer diameter of the convex platform at the lower part is D3; the middle part of the synchronous die (4) is empty and its inner diameter is d1; the positioning die (5) is provided above the synchronous die (4), the lower part of the positioning die (5) passes through the synchronous die (4) and is fixedly connected to the die base (1), and the positioning die (5) is coaxial with the die base (1); the positioning die (5) is in a T shape, its lower outer diameter is d2, its upper outer diameter is d3, and the diameter of the lower end face of the upper part is d4; D2 > d3 > D1 > d4 > d1 > d2; a groove ring (6) for processing the water sealing neck is formed between the upper port of the synchronous die (4) and the upper part of the positioning die (5); during processing, when the synchronous die (4) is in an eccentric state and one side of the outer side of the upper end of the synchronous die (4) is flush with one side of the lower end face of the upper part of the positioning die (5), the groove formed between the synchronous die (4) and the positioning die (5) is the deepest.

2. The necking die for processing a water sealing neck according to claim 1, characterized in that: both ends of the universal joint (2) are square fixing blocks, a square hole matching the square fixing blocks is opened in the middle of the connecting rod (3), and a square hole matching the square fixing blocks is also opened in the center of the bottom of the die base (1).

3. The necking die for processing a water sealing neck according to claim 1, characterized in that: a slope is provided at the bottom end of the upper part of the positioning die (5); when the synchronous die (4) is in an eccentric state, one side of the outer side of the upper end of the synchronous die (4) is flush with one side of the lower end face of the upper part of the positioning die (5).

4. The necking die for processing a water sealing neck according to claim 1, characterized in that: two connecting holes (31) are symmetrically provided on the connecting rod (3), and the synchronous die (4) is connected and fixed to the connecting rod (3) through the two connecting holes (31).

5. The necking die for processing a water sealing neck according to claim 1, characterized in that: on the die base (1), screw holes (12) are symmetrically opened on both sides of the through groove (11); positioning holes (50) corresponding to the screw holes (12) of the die base (1) are provided on the positioning die (5), and the positioning die (5) is connected and fixed to the die base (1) through the positioning holes (50) and the screw holes (12).

6. A necking processing method for processing a water sealing neck, characterized in that: It is processed by using the necking die for processing the water sealing neck according to any one of claims 1-5, and the following steps are carried out in sequence; ① Connect the die holder to the transmission shaft of the machine, place the universal joint in the accommodating hole of the die holder, and fixedly connect the two ends of the universal joint to the bottom of the die holder and the connecting rod respectively; ② According to the requirements of the water sealing neck of the workpiece to be processed, select the corresponding synchronous die and positioning die, and fix the synchronous die on the connecting rod; ③ Place the workpiece to be processed on the necking die; ④ Start the switch, the upper die head quickly descends and elastically presses the workpiece to be processed, and the workpiece to be processed rotates synchronously with the die holder; ⑤ Start the cutter wheel, the cutter wheel feeds towards the groove ring position, the synchronous die generates eccentricity under the action of the cutter wheel, and the workpiece to be processed is processed to form a water sealing neck according to the groove formed by the upper port part of the synchronous die and the upper part of the positioning die; ⑥ After the processing is completed, the cutter is retracted, the synchronous die is restored, the upper die head rises, and the workpiece is taken out.

7. The necking processing method for processing the water sealing neck according to claim 6, characterized in that: In step ⑤, the cutter wheel feeding for processing can be divided into two times. The first time, a rough cutter wheel is used to process the general contour of the water sealing neck; the second time, a fine cutter wheel is used to process more deeply to complete the processing of the water sealing neck.

8. The necking processing method for processing the water sealing neck according to claim 7, characterized in that: In step ⑤, for the two times of cutter wheel feeding for processing, the cutter wheels for the two times of processing can be respectively arranged on the left and right sides of the workpiece, so that the cutter wheels on the left and right sides feed in sequence for processing.

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