Novel structure arch bottom forming die

Abstract

The utility model relates to the technical field of metal container forming, and discloses a novel structure arch bottom forming die which comprises a die base installed on a cold extruding machine body, a male die and a female die, the male die and the female die are used for arch bottom forming, and the male die comprises a second punch. The female die comprises a die ring and a first punch. The die ring and the first punch are both fixedly installed on the die base, and meanwhile the die ring is arranged on the periphery of the first punch in a sleeving mode. The punch tip of the second punch is of an inwards-concave structure matched with the arch bottom, the top of the first punch is of an outwards-convex structure matched with the arch bottom, and the inwards-concave structure is matched with the outwards-convex structure; an inner ring is fixedly arranged in the die ring and arranged outside the top of the first punch in a sleeving mode. The second punch and the first punch are horizontally arranged oppositely, and meanwhile the second punch and the inner ring are in clearance fit with the clearance larger than zero. The forming height of the arch bottom is increased, the production standard is met, the strength and the pressure-bearing performance of the bottom of the aerosol can are enhanced, the production efficiency and the yield are improved, and the rejection rate is remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of metal container forming technology, and in particular to a new type of arch bottom forming mold. Background Technology

[0002] The arched bottom design of aerosol cans is intended to enhance the product's pressure-bearing capacity. Conventional arched bottom forming processes typically involve a necking process, where the bottom of the aerosol can is machined into an arch shape using a mold. However, for large-diameter aerosol cans, due to the greater thickness of the bottom, a single necking process cannot achieve the required arch height. In such cases, the bottom of the aerosol can may experience insufficient pressure-bearing capacity during subsequent use, leading to substandard deformation and burst pressure, severely impacting product safety and market demand.

[0003] To solve the above problems, the traditional arch bottom forming process must be improved to make it suitable for the production requirements of large-diameter aerosol cans, and to ensure that the height and strength of the arch bottom meet the standards. Utility Model Content

[0004] The purpose of this invention is to provide a new type of arch bottom forming mold to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a novel arch bottom forming mold, comprising a mold base mounted on a cold extrusion press body and a punch and a die for forming the arch bottom. The punch includes a second punch; the die includes a die ring and a first punch; both the die ring and the first punch are fixedly mounted on the mold base, with the die ring sleeved around the first punch; the tip of the second punch is an inwardly concave structure matching the arch bottom, and the top of the first punch is an outwardly convex structure matching the arch bottom, with the inwardly concave structure and the outwardly convex structure being matched; an inner ring is fixedly disposed within the die ring, and the inner ring sleeved around the top of the first punch; the second punch and the first punch are horizontally opposed, with the second punch and the inner ring having a clearance fit greater than zero.

[0006] Preferably, the first punch has an outer edge near the mold base, and the outer edge is fixedly connected to the mold base by a second fastening screw; the outer edge of the first punch has a positioning pin hole, and a positioning guide pin is inserted into the positioning pin hole; the positioning guide pin passes through the mold base and is slidably connected to the mold base.

[0007] Preferably, a demolding sleeve is slidably fitted onto the first punch, and the demolding sleeve is slidably engaged with the inner ring of the die ring; the demolding sleeve is fixedly connected to a positioning guide pin; a push plate is fixedly installed on the body of the cold extrusion press, and the push plate is in a stop-and-limit engagement with the positioning guide pin; the die base is slidably installed on the body of the cold extrusion press.

[0008] Preferably, a slip ring is fixedly provided at the end of the demolding sleeve near the mold base, and the slip ring is integrally formed with the demolding sleeve; the slip ring slides with the mold ring and is fixedly connected to the positioning guide pin; an elastic component is provided on the demolding sleeve, and the elastic component is located between the slip ring of the demolding sleeve and the inner ring of the mold ring.

[0009] Preferably, the elastic component is an elastic washer.

[0010] The technical effects and advantages of this utility model are as follows:

[0011] First, this utility model adopts cold extrusion molding to form the arched bottom of the aerosol can in one step, followed by a necking process to complete the secondary forming of the arched bottom. For the primary forming of the arched bottom: a first punch, a second punch, a die ring, and an inner ring are used in conjunction to perform horizontal cold extrusion molding to form the initial arched bottom. For the secondary forming: the workpiece undergoes a necking operation in the existing necking molding process to perform secondary processing on the bottom arch. The two work together to improve the height and shape accuracy, ensuring that the pressure-bearing performance meets the standards. This achieves the goal of increasing the forming height of the arched bottom, meeting production standards, enhancing the strength and pressure-bearing performance of the aerosol can bottom, improving production efficiency and yield, and significantly reducing the scrap rate.

[0012] Secondly, this utility model is applicable to the mass production of various large-diameter aerosol cans, providing an efficient and reliable production solution for the aerosol can industry.

[0013] Third, the first punch of this utility model is precisely positioned by the positioning guide pin, and the remaining stamping force is absorbed by the elastic component. The push plate and the demolding sleeve complete the demolding, thus avoiding damage to the workpiece. Attached Figure Description

[0014] Figure 1 This is a schematic half-sectional view of the present invention.

[0015] In the diagram: 10, push plate; 20, mold base; 30, mold ring; 40, first fastening screw; 50, first punch; 60, second fastening screw; 70, third fastening screw; 80, demolding sleeve; 90, positioning guide pin; 100, elastic component; 110, punch rod; 120, second punch; 130, punch tip. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides, for example Figure 1 The illustration shows a novel arch bottom forming die, comprising a die base 20 mounted on a cold extrusion press body, and a punch and a die for forming the arch bottom. The die base 20 is slidably mounted on the cold extrusion press body.

[0018] The punch includes a second punch 120, the head of which is fixedly provided with a tip 130, which is a concave structure that matches the arch bottom of the aerosol can. The tail of the second punch 120 is fixedly connected to a punch rod 110, which is connected to a power unit on the cold extrusion press to drive the second punch 120 to move horizontally. This is prior art and will not be described in detail here.

[0019] The die includes a die ring 30 and a first punch 50. An inner ring is fixedly disposed inside the head end of the die ring 30, and the tail end of the die ring 30 is fixedly connected to the die base 20 by a first fastening screw 40. The tail end of the first punch 50 is fixedly connected to the die base 20 by a second fastening screw 60. The first punch 50 is located inside the die ring 30, and the die ring 30 is sleeved around the first punch 50.

[0020] The inner ring is fitted around the top of the first punch 50, and the second punch 120 is fitted with the inner ring with a clearance greater than zero to fit the aerosol can body. The top of the first punch 50 has an outwardly convex structure that matches the arched bottom of the aerosol can.

[0021] The second punch 120 and the first punch 50 are horizontally opposed, with a concave structure and a convex structure complementing each other. After the second punch 120 is inserted into the inner ring of the die ring 30, the concave structure and the convex structure press against each other to form an arched bottom on the bottom of the aerosol can.

[0022] The first punch 50 has an outer rim near the end of the mold base 20, which is threaded to the second fastening screw 60. A locating pin hole is provided on the outer rim, into which a locating guide pin 90 is inserted. The locating guide pin 90 passes through the mold base 20 and is slidably connected to it. This is used for the mounting and positioning of the first punch 50.

[0023] A demolding sleeve 80 is slidably fitted onto the first punch 50. The end of the demolding sleeve 80 away from the mold base 20 is slidably engaged with the inner ring of the mold ring 30, and a slip ring is coaxially fixedly mounted on the end of the demolding sleeve 80 near the mold base 20. The slip ring and the demolding sleeve 80 are integrally formed, and the slip ring is slidably engaged with the mold ring 30.

[0024] The slip ring is fixedly connected to the positioning guide pin 90. A push plate 10 is fixedly installed on the body of the cold extrusion press, and the push plate 10 abuts and limits the positioning guide pin 90. It is used for demolding.

[0025] An elastic component 100 is provided on the demolding sleeve 80, located between the slip ring of the demolding sleeve 80 and the inner ring of the die ring 30. It is used to absorb residual force during stamping and demolding, reducing impact damage to the die. The elastic component 100 is an elastic washer, which is fitted onto the demolding sleeve 80.

[0026] The tail of the first punch 50 is fixedly connected to a push rod by a third fastening screw 70. The push rod passes through the mold base 20 and the push plate 10, and is slidably engaged with both the mold base 20 and the push plate 10. The push rod is slidably connected to the cold extrusion press body and is also connected to a corresponding component on the cold extrusion press. This drives the push rod to move horizontally, while restricting its movement during cross-punching. This is prior art and will not be described in detail here.

[0027] Working principle: When the aerosol can is formed into an arched bottom in one step, the aerosol can is fitted onto the second punch 120, at which point the tip 130 of the second punch 120 contacts the bottom of the aerosol can. Then, the power unit on the cold extrusion press drives the second punch 120 to move closer to the first punch 50.

[0028] Subsequently, the second punch 120 drives the aerosol can to slide into the inner ring of the die ring 30. When the bottom of the aerosol can contacts the top of the first punch 50, the tip 130 of the second punch 120 and the top of the first punch 50 press against the bottom of the aerosol can. At this time, the concave structure of the tip 130, which matches the arched bottom of the aerosol can, presses against the convex structure of the top, which matches the arched bottom of the aerosol can. This achieves the one-time forming of the arched bottom of the aerosol can.

[0029] After one-time forming, the corresponding component of the cold extrusion press pulls the ejector rod away from the second punch 120. The ejector rod, through the third fastening screw 70, drives the first punch 50 to move away from the second punch 120. At the same time, the power unit of the cold extrusion press drives the second punch 120 to move away from the first punch 50.

[0030] During this process, the first punch 50 drives the mold base 20 to move closer to the push plate 10. Because the push plate 10 and the positioning guide pin 90 are in a stop-and-hold engagement, the positioning guide pin 90 is stationary, and the demolding sleeve 80 is also stationary. At this time, the mold ring 30, the first punch 50, and the demolding sleeve 80 slide relative to each other. This causes the demolding sleeve 80 to push the aerosol can, after the one-time formed arch bottom, to slide out from inside the mold ring 30.

[0031] Finally, the aerosol can with the arched bottom formed in the first step is removed from the mold ring 30. A necking forming process is then used to neck the bottom of the aerosol can, thus refining the arched shape of the can bottom and achieving secondary arching. This ensures that the forming height meets the design standard and further enhances the strength of the arched bottom area.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A new structure forming die for arch bottom, comprising a die base (20) mounted to a cold extrusion machine body and a punch and a die for forming arch bottom, characterized in that: The punch includes a second punch (120); the die includes a die ring (30) and a first punch (50); the die ring (30) and the first punch (50) are fixedly installed on a die base (20), and the die ring (30) is sleeved on the periphery of the first punch (50); the punch tip (130) of the second punch (120) is an inner recess structure matched with an arch bottom, the top head of the first punch (50) is an outer convex structure matched with the arch bottom, and the inner recess structure and the outer convex structure are matched; an inner ring is fixedly arranged in the die ring (30), and the inner ring is sleeved on the periphery of the top head of the first punch (50); the second punch (120) and the first punch (50) are horizontally opposite, and the second punch (120) and the inner ring are in a gap cooperation with a gap greater than zero.

2. A new structure of forming die for arch bottom, according to claim 1, characterized in that: The first punch (50) is provided with an outer edge close to the end of the die base (20), and the outer edge is fixedly connected with the die base (20) through a second fastening screw (60); the outer edge of the first punch (50) is provided with a positioning pin hole, and a positioning guide pin (90) is inserted into the positioning pin hole; the positioning guide pin (90) penetrates through the die base (20) and is in sliding connection with the die base (20).

3. A new structure forming mold for arch bottom according to claim 2, characterized in that: The first punch (50) is provided with an outer edge close to the end of the die base (20), and the outer edge is fixedly connected with the die base (20) through a second fastening screw (60); the outer edge of the first punch (50) is provided with a positioning pin hole, and a positioning guide pin (90) is inserted into the positioning pin hole; the positioning guide pin (90) penetrates through the die base (20) and is in sliding connection with the die base (20).

4. The forming mold for a new structure of arch bottom according to claim 3, characterized in that: The first punch (50) is provided with an outer edge close to the end of the die base (20), and the outer edge is fixedly connected with the die base (20) through a second fastening screw (60); the outer edge of the first punch (50) is provided with a positioning pin hole, and a positioning guide pin (90) is inserted into the positioning pin hole; the positioning guide pin (90) penetrates through the die base (20) and is in sliding connection with the die base (20).

5. The new structure forming mold for arch bottom according to claim 4, characterized in that: The elastic assembly (100) is an elastic washer.

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