阅读说明：本技术 一种盖型螺母的成型工艺及其成型装置 (Forming process and forming device of cap nut ) 是由 钱定忠 周浩伟 钱铭 林万鹏 于 2020-06-22 设计创作，主要内容包括：本发明涉及一种盖型螺母成型装置,包括送料机构以及依次设置的五个模具,其中,所述送料机构在五个模具之间移动送料,所述五个模具包括：用于得到整形坯件的预镦模具、用于形成六角坯件的镦六角模具、用于生成预成型坯件的镦预成型模具、用于进一步加工预成型坯件的成型模具和用于完成体盖形法兰螺母通内孔的通孔模具。并利用该盖型螺母成型装置进行的成型工艺,步骤有：整形；镦六角；镦六角法兰盖形雏形；成型；通内孔。通过采用上述技术方案,减少焊盖或铆压盖工序及其成本；减少焊盖或铆压盖后二次攻丝的成本；避免因焊盖或铆压盖造成的螺纹通止问题而导致的成本浪费和质量风险；采用冷挤压一次成型工艺,不但降低了生产成本,提高生产效率。(The invention relates to a cap nut forming device, which comprises a feeding mechanism and five dies which are sequentially arranged, wherein the feeding mechanism feeds materials in a moving manner among the five dies, and the five dies comprise: the pre-upsetting die is used for obtaining a shaped blank, the upsetting hexagonal die is used for forming a hexagonal blank, the upsetting preforming die is used for generating a preforming blank, the forming die is used for further processing the preforming blank, and the through hole die is used for completing the through inner hole of the body-shaped flange nut. And the molding process by using the cap nut molding device comprises the following steps: shaping; upsetting a hexagon; upsetting a hexagonal flange cover-shaped prototype; molding; and an inner hole is formed. By adopting the technical scheme, the cover welding or riveting process and the cost are reduced; the cost of secondary tapping after the cover is welded or riveted is reduced; the problems of thread connection and disconnection caused by welding a cover or riveting a cover are avoided, so that cost waste and quality risks are avoided; the cold extrusion one-step forming process is adopted, so that the production cost is reduced, and the production efficiency is improved.)

1. The utility model provides a lid type nut forming device which characterized in that: including feeding mechanism and five moulds that set gradually, wherein, feeding mechanism removes the pay-off between five moulds, five moulds include: the pre-upsetting die is used for obtaining a shaped blank, the upsetting hexagonal die is used for forming a hexagonal blank, the upsetting preforming die is used for generating a preforming blank, the forming die is used for further processing the preforming blank, and the through hole die is used for completing the through inner hole of the body-shaped flange nut.

2. A cap nut molding apparatus as claimed in claim 1, wherein: the five dies comprise female die assemblies and male die assemblies which are correspondingly arranged, the male die assemblies are arranged on the sliding block, the pre-upsetting die comprises a female pre-upsetting die and a male pre-upsetting die, the upsetting die comprises a female upsetting die and a male upsetting die, the upsetting pre-forming die comprises a female upsetting pre-forming die and a male upsetting pre-forming die, the forming die comprises a female forming die and a male forming die, the through hole die comprises a male through hole die, a blind hole rod and a female through hole die, the blind hole rod is arranged in the male through hole die, and the feeding mechanism is arranged between the female die assemblies and the male die assemblies.

3. A cap nut molding apparatus as claimed in claim 2, wherein: the female upsetting forming die is characterized in that a chamfer hole is formed in the female upsetting die, an inverted cover blank hole is formed in the female upsetting pre-forming die, an inverted cover forming hole is formed in the female forming die, and a waste discharge hole is formed in the female through hole die.

4. A forming process of a cap nut is characterized in that: sequentially shaping the blank by using the cap nut forming apparatus according to any one of claims 1 to 3; upsetting a hexagon; upsetting a hexagonal flange cover-shaped prototype; molding; and an inner hole is formed.

5. The process for forming a cap nut according to claim 4, wherein: the method comprises the following steps:

step S1: conveying the blank between a male pre-upsetting die and a female pre-upsetting die by using a feeding mechanism, extruding the blank piece into the female pre-upsetting die by the male pre-upsetting die under a vertically downward pressure, and obtaining a shaping blank with a chamfer through a chamfer hole;

step S2: conveying the shaped blank to a position between a male heading die and a female heading die by adopting a feeding mechanism, extruding the shaped blank into the female heading die by the male heading die under a vertically downward pressure, and generating a hexagonal blank with a hexagonal prism at the lower end and a cylinder at the upper end through a reversed hexagonal hole;

step S3: conveying the hexagonal blank to a position between a male upsetting preforming die and a female upsetting preforming die by adopting the feeding mechanism, extruding the hexagonal blank into the female upsetting preforming die by the male upsetting preforming die under the action of a vertical downward pressure, and generating a preformed blank with a cap part with a positioning hole at the lower end, a hexagonal prism at the middle end and a flange plate with a blind hole at the upper end through an inverted cap blank hole;

step S4: conveying the preformed blank to a position between a male forming die and a female forming die by adopting the feeding mechanism, extruding the preformed blank into the female forming die by the male forming die under the action of a vertically downward pressure, further forming the preformed blank, further deepening a blind hole to the middle end, and obtaining a formed cover-shaped flange blank with a dome-shaped cover part by inverting the cover forming hole;

step S5: adopt feeding mechanism conveys shaping lid shape flange blank to between positive through-hole mould and the negative through-hole mould, and the positive through-hole mould receives a vertical decurrent pressure and extrudees this shaping lid shape flange blank in the negative through-hole mould, further deepens the blind hole to block portion through the extrusion of blind hole stick, obtains the completion lid shape flange nut and pushes up the waste material into negative through-hole mould through the blind hole stick and gets rid of through the waste discharge mouth.

6. The process of claim 5, wherein the cap nut is formed by: the step S1 further includes: and extruding the blank piece into the female pre-upsetting die by the male pre-upsetting die through forward extrusion to obtain a shaped blank which is 5-10 mm larger than the blank with the excircle diameter.

7. The process of claim 5, wherein the cap nut is formed by: the step S2 further includes: and extruding the shaping blank into a hexagonal blank through composite extrusion, wherein the diameter of an inscribed circle of the lower hexagonal prism of the hexagonal blank is equal to that of the upper cylinder, and the diameter of the inscribed circle of the lower hexagonal prism of the hexagonal blank is 10-12 mm larger than that of the shaping blank, and the volume of the hexagonal blank is unchanged.

8. The process of claim 5, wherein the cap nut is formed by: the step S5 further includes: the male through hole die is pressed into the female through hole die by a vertical downward pressure, and the flange plate of the formed cover-shaped flange blank is positioned outside the female through hole die.

9. The process of claim 4, wherein the cap nut is formed by: the frequency is 70-90 deg.C/min.

Technical Field

The invention belongs to the technical field of machinery, and particularly relates to a forming process and a forming device of a cap nut.

Background

The cap nut is widely applied to automobile parts and has a large market demand. The cap-type nut comprises a nut body and a cap, and the common technical scheme is that the nut body and the cap are of split structures and are connected through a welding or riveting process. After the split structure is adopted, the nut body is an existing standard nut, only the nut cap needs to be welded or riveted on the standard nut, the manufacturing difficulty is low, but when the process is used for welding or riveting, the nut cap deflects, the nut cannot pass through the nut cap easily, secondary tapping needs to be carried out, the processing cost is high, and the risk of incapability is caused after the secondary tapping. In view of the above, the conventional cap nut forming process has disadvantages and drawbacks in practical use, and therefore needs to be improved.

Disclosure of Invention

In summary, in order to overcome the defects in the prior art, the invention provides a cap nut forming device which saves cost and improves quality.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a lid type nut forming device, includes feeding mechanism and five moulds that set gradually, wherein, feeding mechanism removes the pay-off between five moulds, five moulds include: the pre-upsetting die is used for obtaining a shaped blank, the upsetting hexagonal die is used for forming a hexagonal blank, the upsetting preforming die is used for generating a preforming blank, the forming die is used for further processing the preforming blank, and the through hole die is used for completing the through inner hole of the body-shaped flange nut.

The invention further provides that: the five dies comprise female die assemblies and male die assemblies which are correspondingly arranged, the male die assemblies are arranged on the sliding block, the pre-upsetting die comprises a female pre-upsetting die and a male pre-upsetting die, the upsetting die comprises a female upsetting die and a male upsetting die, the upsetting pre-forming die comprises a female upsetting pre-forming die and a male upsetting pre-forming die, the forming die comprises a female forming die and a male forming die, the through hole die comprises a male through hole die, a blind hole rod and a female through hole die, the blind hole rod is arranged in the male through hole die, and the feeding mechanism is arranged between the female die assemblies and the male die assemblies.

The invention further provides that: the female upsetting forming die is characterized in that a chamfer hole is formed in the female upsetting die, an inverted cover blank hole is formed in the female upsetting pre-forming die, an inverted cover forming hole is formed in the female forming die, and a waste discharge hole is formed in the female through hole die.

By adopting the technical scheme, the cover-shaped nut forming device is adopted to form the cover-shaped nut at one time, so that the production cost is reduced, and the production efficiency is improved.

The invention also provides a forming process by using the cap nut forming device, which comprises the following steps: shaping; upsetting a hexagon; upsetting a hexagonal flange cover-shaped prototype; molding; and an inner hole is formed.

The invention further provides that: step S1: conveying the blank between a male pre-upsetting die and a female pre-upsetting die by using a feeding mechanism, extruding the blank piece into the female pre-upsetting die by the male pre-upsetting die under a vertically downward pressure, and obtaining a shaping blank with a chamfer through a chamfer hole; step S2: conveying the shaped blank to a position between a male heading die and a female heading die by adopting a feeding mechanism, extruding the shaped blank into the female heading die by the male heading die under a vertically downward pressure, and generating a hexagonal blank with a hexagonal prism at the lower end and a cylinder at the upper end through a reversed hexagonal hole; step S3: conveying the hexagonal blank to a position between a male upsetting preforming die and a female upsetting preforming die by adopting the feeding mechanism, extruding the hexagonal blank into the female upsetting preforming die by the male upsetting preforming die under the action of a vertical downward pressure, and generating a preformed blank with a cap part with a positioning hole at the lower end, a hexagonal prism at the middle end and a flange plate with a blind hole at the upper end through an inverted cap blank hole; step S4: conveying the preformed blank to a position between a male forming die and a female forming die by adopting the feeding mechanism, extruding the preformed blank into the female forming die by the male forming die under the action of a vertically downward pressure, further forming the preformed blank, further deepening a blind hole to the middle end, and obtaining a formed cover-shaped flange blank with a dome-shaped cover part by inverting the cover forming hole; step S5: adopt feeding mechanism conveys shaping lid shape flange blank to between positive through-hole mould and the negative through-hole mould, and the positive through-hole mould receives a vertical decurrent pressure and extrudees this shaping lid shape flange blank in the negative through-hole mould, further deepens the blind hole to block portion through the extrusion of blind hole stick, obtains the completion lid shape flange nut and pushes up the waste material into negative through-hole mould through the blind hole stick and gets rid of through the waste discharge mouth.

By adopting the technical scheme, the cover welding or riveting process and the cost are reduced; the cost of secondary tapping after the cover is welded or riveted is reduced; the problems of thread connection and disconnection caused by welding a cover or riveting a cover are avoided, so that cost waste and quality risks are avoided; the cold extrusion one-step forming process is adopted, so that the production cost is reduced, and the production efficiency is improved; but also improves the surface quality of the parts, the strength and the structure performance of the parts.

According to the manufacturing process, the step S1 further includes: and extruding the blank piece into the female pre-upsetting die by the male pre-upsetting die through forward extrusion to obtain a shaped blank which is 5-10 mm larger than the blank with the excircle diameter.

According to the manufacturing process, the step S2 further includes: and extruding the shaping blank into a hexagonal blank through composite extrusion, wherein the diameter of an inscribed circle of the lower hexagonal prism of the hexagonal blank is equal to that of the upper cylinder, and the diameter of the inscribed circle of the lower hexagonal prism of the hexagonal blank is 10-12 mm larger than that of the shaping blank, and the volume of the hexagonal blank is unchanged.

According to the manufacturing process, the step S5 further includes: the male through hole die is pressed into the female through hole die by a vertical downward pressure, and the flange plate of the formed cover-shaped flange blank is positioned outside the female through hole die.

By adopting the technical scheme, the blank is naturally shaped by the upward thrust outside the die through the plasticity of metal, so that the utilization rate of the material is increased.

The invention further provides that: the frequency is 70-90 deg.C/min.

Through adopting above-mentioned technical scheme, keep certain frequency, prevent that speed from passing to lead to the mould to damage.

Drawings

FIG. 1 is a view showing a structure of a cap nut forming apparatus according to an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is an enlarged view of section C of FIG. 1;

FIG. 5 is a process flow diagram of an embodiment of the invention;

FIG. 6 is a schematic view of a blank forming process according to an embodiment of the present invention;

reference numerals: 1. the blank comprises a blank, 2, a shaping blank, 3, a hexagonal blank, 4, a preforming blank, 5, a forming cover flange blank, 6, a finished cover flange nut, 7, a male die assembly, 71, a male pre-upsetting die, 72, a male upsetting die, 73, a male upsetting preforming die, 74, a male forming die, 75, a male through hole die, 751, a blind hole rod, 8, a female die assembly, 81, a female pre-upsetting die, 82, a female upsetting die, 821, an inverted hexagonal hole, 83, a female pre-upsetting die, 831, an inverted cover brooding hole, 84, a female forming die, 841, an inverted cover forming hole, 85, a female through hole die, 851, a waste discharge hole and 9, a sliding block.

The examples describe specific embodiments of the present invention.