Roll finishing die for threads of water cup

Abstract

The utility model discloses a rolling machining die for threads of a water cup, which can greatly improve the out-of-round problem of the threads and ensure that the height size of the threads at the mouth of the water cup reaches a preset value. Comprising a male die and a female die, and the male die comprises a male die body and a thread protrusion; the female die comprises a female die body and a threaded groove. The male die main body and the female die main body are circular; the thread protrusions and the thread grooves are wound around the circumferential side walls of the male die body and the circumferential side walls of the female die body correspondingly. A gap is formed between the thread groove and the thread bulge, and the spiral directions are opposite; each thread bulge is provided with a continuous single section and an overlapping section; the height of the overlapping section is not smaller than that of the single section, and the overlapping section and the single section are connected in a gradual transition mode.

Description

TECHNICAL FIELD

[0001] The utility model belongs to thread processing device technical field, especially relate to a kind of water cup thread roll press processing die. BACKGROUND

[0002] At present, the cup body and the cup cover of water cup are generally connected by thread. Therefore, the cup opening position of water cup is usually provided with thread matched with cup cover. Thread height is a major factor affecting the connection firmness of cup cover and water cup. Thread height is usually set at about 1.5-2mm. If thread is lower than the above height, the thread hanging size between cup cover and water cup is not enough. Under high pressure in water cup, cup cover is easy to be blown off to cause water leakage. In extreme case, cup cover is bounced under high pressure steam (like explosion), which is very dangerous.

[0003] At present, the thread of water cup is generally formed by thread die roll press processing. However, the thread processed by existing thread die is intuitively out of round. The height difference between higher and lower parts of thread can reach 0.6-0.9mm. That is to say, if thread height requirement is set at 2mm, but the lower part of thread after processing can only be 1.1-1.4mm, which is far from the predetermined requirement, and cup cover is easy to be blown off to cause water leakage. After thread is out of round, it also causes the rotation and jamming between cup cover and cup opening. SUMMARY

[0004] In order to solve the problems existing in the prior art, the utility model aims to provide a kind of water cup thread roll press processing die, which can greatly improve the problem of thread out of round and ensure that the height size of water cup opening thread reaches the preset value.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions.

[0006] A kind of water cup thread roll press processing die, comprising a punch and a die, the punch comprises a punch body and a thread projection, the die comprises a die body and a thread groove, the punch body and the die body are circular, the thread projection and the thread groove are wound on the circumferential sidewall of the punch body and the die body respectively, the thread groove and the thread projection have a gap between them, and the spiral directions are opposite, the thread projection has a continuous single section and an overlapping section, the height of the overlapping section is not lower than the height of the single section, and the overlapping section and the single section are gradually transitioned and connected.

[0007] Preferably, the height of the overlapping section is 0.2-0.3mm higher than the single section.

[0008] Preferably, the height of the overlapping section is 0.3mm higher than the single section.

[0009] Preferably, the depth of the thread groove is not less than the height of the overlapping section.

[0010] The beneficial effects of the utility model compared with the prior art are: adopting the technical scheme, when at least one of the male die and the female die rotates around the other, the mouth thin wall of the water cup can be formed with threads by rolling; by setting the overlapping section height of the male die thread protrusion to be higher than the height of a single section, the situation of thread height not meeting the standard due to the overlapping section thread not being full caused by the material flow factor due to structural limitations during rolling can be reduced, the increased height of the overlapping section can be compensated for height, so that the thread out-of-roundness of the formed water cup mouth is improved and the thread height meets the preset size; moreover, the overlapping section and the single section are gradually connected, so that no step difference is formed during rolling and the overlapping section is not damaged due to extrusion. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 is a schematic view of the three-dimensional structure of the male die.

[0012] Fig. 2 is a schematic view of the three-dimensional structure of the female die.

[0013] Fig. 3 is a schematic view of the cross-sectional structure during rolling processing. DETAILED DESCRIPTION

[0014] In order to make the technical scheme of the utility model more clear, the following will be combined with the drawings of the utility model to further describe the utility model. Figs. 1 to 3 The utility model will be described in detail. It should be understood that the specific embodiments described in the specification are only for the purpose of explaining the utility model, and are not intended to limit the protection scope of the utility model.

[0015] The utility model is a rolling processing die for water cup threads, which comprises a male die 1 and a female die 2, and at least one of the male die 1 and the female die 2 rotates around the other to form threads by rolling the mouth thin wall of the water cup.

[0016] Specifically, the outer diameter size of the male die 1 is matched with the inner diameter of the mouth of the water cup and can freely extend into or out of the mouth of the water cup (applicable to forming external threads, if internal threads are required, the female die 2 needs to be arranged to be able to extend into or out of the mouth of the water cup); it comprises a circular male die main body 11, and a thread protrusion 12 is wound on the circumferential side wall of the male die main body 11.

[0017] Specifically, the female die 2 comprises a circular female die main body 21, and a thread groove 22 matched with the thread protrusion 12 is arranged on the circumferential side wall of the female die main body 21, the thread groove 22 and the thread protrusion 12 have a gap therebetween, and the spiral directions are opposite, which facilitates rolling processing.

[0018] Further, the thread convex 12 has a continuous single section 121 and an overlapping section 122; in the prior art, the height of the single section 121 and the overlapping section 122 is consistent, and in the processing process, the overlapping section 122 is spaced and overlapped by two or more thread sections, and when rolling and forming, the flow of the material is not sufficient, resulting in that the thread forming of the section is not full, the height after forming cannot meet the requirements, and compared with the height of the single section 121, there is a gap, and finally the problem of thread out-of-roundness occurs; in the embodiment, the overlapping section 122 is set to be 0.2-0.3 mm higher than the single section 121, and preferably 0.3 mm, and the overlapping section 122 and the single section 121 are gradually connected; by increasing the height of the overlapping section 122, although the structure limits the flow of the material, after the height is increased, the height difference between the higher part and the lower part of the cup mouth thread of the formed water cup can be stabilized at 0.2-0.3 mm, for example, the thread height is specified to be 2 mm, and then the height of the lowest part of the thread after forming can reach 1.7-1.8 mm, which greatly improves the thread out-of-roundness, and the size can ensure that the height size of the cup mouth thread of the water cup reaches the preset value, and ensures the connection firmness of the cup cover and the cup body.

[0019] Further, the depth of the thread groove 22 is overall matched with the height of the overlapping section 122, and specifically cannot be less than the height size of the overlapping section 122.

Claims

1. A thread rolling die for water cup, comprising a punch (1) and a die (2), characterized in that: the punch (1) comprises a punch body (11) and a thread projection (12); the die (2) comprises a die body (21) and a thread groove (22); the punch body (11) and the die body (21) are both circular; the thread projection (12) and the thread groove (22) are respectively wound on the circumferential side wall of the punch body (11) and the die body (21); the thread groove (22) and the thread projection (12) have a gap therebetween and the spiral directions are opposite; the thread projection (12) has a continuous single section (121) and an overlapping section (122); the height of the overlapping section (122) is not less than the height of the single section (121); the overlapping section (122) and the single section (121) are gradually and transitionally connected.

2. The thread rolling die for water cup according to claim 1, characterized in that: the height of the overlapping section (122) is 0.2-0.3 mm higher than the height of the single section (121).

3. The thread rolling die for water cup according to claim 2, characterized in that: the height of the overlapping section (122) is 0.3 mm higher than the height of the single section (121).

4. The thread rolling die for water cup according to claim 1, characterized in that: the depth of the thread groove (22) is not less than the height of the overlapping section (122).

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