CN210936892U

CN210936892U - Forming mechanism of pressure riveting nut

Info

Publication number: CN210936892U
Application number: CN201920733129.1U
Authority: CN
Inventors: 詹怀波; 路凤
Original assignee: Penn Engineering Automotive Fasteners Kunshan Co ltd
Current assignee: Penn Engineering Automotive Fasteners Kunshan Co ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-07-07
Anticipated expiration: 2029-05-21

Abstract

The utility model discloses a forming mechanism of nut is riveted in pressure, including being used for the shaping the cold heading machine of holding slot part, tooth portion, flange, pole portion and through-hole of nut is riveted in pressure is used for form threaded tapping device in the through-hole, be used for after tapping the nut is riveted in pressure carries out the equipment for heat treatment that handles and is used for right the nut carries out surface treatment's surface treatment equipment is riveted in pressure. Compared with the prior art, the mode of machining is replaced by the mode of cold heading machining, the appearance and the through hole of the rivet pressing nut can be directly subjected to cold heading, and equipment for machining the through hole is saved in comparison with machining, so that the manufacturing cost is saved, the utilization rate of materials and the qualification rate of products can be improved, and the production efficiency of the products is improved.

Description

Forming mechanism of pressure riveting nut

Technical Field

The utility model relates to a fastener field of making, in particular to forming mechanism who rivets nut presses.

Background

In the fixing of the television set housing, a clinch nut is required, which is mainly structured with a head, a flange and a stem. The shape of the pressure riveting nut is complex, the flange is flat, the size of the rod part is the same as that of the head part, and the head part comprises a tooth part and a groove containing part. The existing production process is realized by machining, but the product is very difficult to form due to the complex structure of the product, and the production efficiency is low. The machining requires a large amount of equipment and the utilization rate of materials is low, resulting in high production cost.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect among the prior art, the embodiment of the utility model provides a forming mechanism of nut is riveted to pressure, include: the cold header is used for forming the groove containing part, the tooth part, the flange, the rod part and the through hole of the press riveting nut, is used for forming a tapping device of a thread in the through hole, is used for carrying out heat treatment on the press riveting nut after tapping and is used for carrying out surface treatment on the press riveting nut.

Further, the cold header includes: blank mechanism, ejection mechanism, transport mechanism and six moulds, wherein, install cutting die and shear die in the die cavity of blank mechanism for cut off the material, six moulds are integrated in the cold heading machine, ejection mechanism is used for with the product in the die cavity is ejecting, transport mechanism is in remove the pay-off between ejection mechanism and the six moulds, specifically, follow blank mechanism in proper order and convey first mould until the sixth mould.

Further, the six molds comprise: a first die for shaping a wire and preforming a first bore at a top of the wire, forming a second bore at a bottom of the wire, a second mold for preforming the flange on the first mold material processed by the first mold, is used for carrying out flange forming on the second die technology material processed by the second die, a third die for preforming the groove part and the tooth part, and a fourth die for performing the groove part preforming and the tooth part molding on a third die process material processed by the third die, a fifth mould used for flanging and forming the groove containing part of the fourth mould process material processed by the fourth mould and removing waste materials between the first inner hole and the second inner hole, and the sixth die is used for removing the flash of the fifth die process material processed by the fifth die.

Further, the first to sixth molds are composed of a master mold and a punch; the master mold includes: the device comprises a main die shell, a main die core, a nitrogen spring, a main die cushion block and a main die thimble, wherein the main die core, the nitrogen spring and the main die cushion block are arranged in the main die shell from top to bottom in sequence; the die includes: the stamping die comprises a stamping die mould shell, a stamping die core arranged in the stamping die mould shell, a stamping die thimble and a stamping die cushion block, wherein a stamping die cavity is arranged at the bottom of the stamping die core, and the stamping die thimble extends into the stamping die cavity from the stamping die core; the main die cavity corresponds to the die cavity and is used for fixing the wire.

Further, the second die adopts a floating main die, and the floating main die performs floating forward extrusion on the bottom of the first die process material.

Further, the periphery of a fourth stamping ejector pin in the fourth die is wrapped with a stamping sleeve, and the stamping sleeve extends into the groove accommodating part of the third die process material and carries out cold heading on the third die process material; the outer periphery of a fifth stamping ejector pin in the fifth die is wrapped with a first stamping sleeve, the outer periphery of the first stamping sleeve is wrapped with a second stamping sleeve, the first stamping sleeve is used for forming a flanging of the accommodating groove part, the second stamping sleeve is clamped with the tooth part, and a discharge hole is further formed in a fifth main die core.

Further, the conveying mechanism adopts a clamp, the clamp is made into a step shape, and the clamp is formed by clamping two identical parts.

Further, the main molds of the first mold to the sixth mold are spliced from the same two parts.

The utility model has the advantages as follows: compared with the prior art, the utility model discloses a mode of cold-heading processing replaces the direct cold-heading of machining to go out the appearance and the through-hole of pressure rivet nut are compared in the equipment that has saved a processing through-hole in machining, can practice thrift the cost. And the cold heading machine is adopted to produce the rivet pressing nut, so that the utilization rate of materials and the qualification rate of products are greatly improved, and the production efficiency is improved.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a press-riveting nut in an embodiment of the present invention;

fig. 2 is a schematic structural view of a first mold to a sixth mold in a forming mechanism for a clinch nut according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a change of a wire rod during a cold heading process according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a second mold in an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a fourth mold in the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fifth mold in the embodiment of the present invention;

FIG. 7 is a schematic view of a half clip according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a clip according to an embodiment of the present invention.

Reference numerals of the above figures: pressing and riveting the nut-100; a head-1; a groove accommodating part-2; a tooth-3; a flange-4; a rod part-5; a through-hole-6; a first bore-7; a second bore-8; flanging part-9; a first mold-10; a main mold shell-201; a master mold core-202; a main mold thimble-203; a main mold cushion block-204; a main model cavity-205; a nitrogen spring-206; die form-211; die ejector pin-213; die pad-214; die cavity-215; a second mold-20; a second main mold thimble-203; a second main model cavity-205; a second gas spring-206; a main die sleeve-208; a third mold-30; a fourth mold-40; a fourth die ejector pin-513, a first die sleeve-516; a second die sleeve-517; a fifth mold-50; a fifth master mold core-502; a discharge hole-5020; sixth mold-60; a clip-70; a clamping portion-701;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.

To achieve the above object, the present invention also provides a forming mechanism for pressing the rivet nut 100, including: the cold header is used for forming the press rivet nut 100, and the cold header is used for performing heat treatment on the press rivet nut 100 and performing surface treatment on the press rivet nut 100. Specifically, the utility model discloses a cold heading machine is accomplished the shaping operation of pressure rivet nut 100 can be with direct by the cold heading machine cold-heading shaping. Compared with the prior art, the mode of machining is replaced by the mode of cold heading, the appearance and the through hole of the rivet pressing nut 100 can be directly subjected to cold heading, and compared with machining, equipment for machining the through hole is saved, so that the manufacturing cost is saved. The use of the cold heading machine to produce the press rivet nut 100 greatly improves the utilization rate of materials, and the size of the used die is accurately designed according to the needs of the product, so that the forming rate of the product and the precision of the size of the product are improved, the qualification rate of the product is improved, and the production efficiency is greatly improved.

Furthermore, the heat treatment equipment is a heating furnace, and the surface treatment equipment comprises polishing, electroplating and anticorrosion treatment equipment.

The cold header includes: blanking mechanism, ejection mechanism, transport mechanism and six moulds. The material cutting mechanism is arranged on the ejection mechanism, and a cutting die and a shearing die are arranged in a die cavity of the material cutting mechanism and used for cutting off materials. The six dies are integrated in the cold header, and the ejection mechanism is located on one side of the machine table and used for ejecting the product in the die cavity. And the conveying mechanism moves between the ejection mechanism and the six molds for feeding. Specifically, the cutting mechanism cuts wires or wire rods by using equipment such as scissors, and the ejection mechanism continuously ejects wires of fixed length. After the wire rods are cut off by the scissors, the wire rods are transferred to a die of the cold header by the conveying mechanism. Generally, in order to ensure the continuous operation of the cold header, a group of conveying mechanisms is generally arranged between every two adjacent groups of equipment. And the conveying mechanism is sequentially conveyed from the blanking mechanism to the first die to the sixth die. Typically, the delivery mechanism employs a clip 70.

The first die to the sixth die correspond to the first station to the sixth station respectively, and the wires passing through each die correspond to the first die process material to the sixth die process material respectively.

As shown in fig. 2, the six molds include: the first die 10 at the first station, the first die 10 for shaping a wire and preforming a first bore 7 at the top of the wire, preforming the stem 5 at the bottom of the wire, forming a second bore 8 at the stem 5. And the wire is subjected to cold heading by the first die 10 to obtain the first die process material.

The second mold 20 at a second station, the second mold 20 being used to preform the head 1 and flange 4 for the first mold charge. And the second die technology material is obtained after the first die technology material is subjected to cold heading by the second die 20.

And the third die 30 is positioned at a third station, and the third die 30 is used for forming the flange 4 of the second mold material and pre-forming the groove-containing part 2 and the tooth part 3 of the head part 1. The second die work material is subjected to cold heading by the third die 30 to obtain the third die work material.

And the fourth die 40 is positioned at a fourth station, and the fourth die 40 is used for molding the tooth part 3 and the groove containing part 2 of the third die material. And the fourth die technology material is obtained after the third die technology material is subjected to cold heading by the fourth die 40.

And the fifth die 50 is positioned at a fifth station, and the fifth die 50 is used for flanging the accommodating groove part 2 of the fourth die process material and removing waste materials between the first inner hole 7 and the second inner hole 8. And the fourth die process material is subjected to cold heading by the fifth die 50 to obtain the fifth die process material.

And the sixth die 60 is positioned at a sixth station, and the sixth die 60 is used for deburring the fifth die process material. And the fifth die process material is subjected to cold heading by the sixth die 60 to obtain the sixth die process material, namely the appearance and the through hole of the clinch nut 100.

The first to sixth molds 10 to 60 are each composed of a master mold and a punch.

The main mold comprises a main mold shell 201, a main mold core 202 arranged in the main mold shell 201, a nitrogen spring 206, a main mold cushion block 204 and a main mold thimble 203, wherein the main mold core 202, the nitrogen spring 206 and the main mold cushion block 204 are sequentially arranged in the main mold shell 201 from top to bottom, a main mold cavity 205 is arranged in the main mold core 202, one end of the main mold thimble 203 is fixed on the main mold cushion block 204, and the other end of the main mold thimble 203 is driven by the main mold to extend into the main mold cavity 205.

The die comprises a die mould shell 211, a die mould core arranged in the die mould shell 211, a die thimble 213 and a die cushion block 214, wherein a die cavity 215 is arranged at the bottom of the die mould core, one end of the die thimble 213 is fixed on the die cushion block 214, and the other end of the die thimble extends into the die cavity 215. The primary mold cavity 215 corresponds to the die cavity 215 for holding the wire.

The die ejector pins of the first die 10 act on the top of the wire to preform the first bore 7, the main die ejector pins of the first die 10 act on the bottom of the wire to preform the stem 5 and form the second bore 8 at the stem 5. The first bore 7 and the second bore 8 have the same bore size but are not connected.

As shown in fig. 4, the outer periphery of the main ejector pin 203 of the second mold 20 is wrapped with a main mold sleeve 208, and the main mold sleeve 208 has a certain wall thickness. The main mold ejector 203, the main mold sleeve 208 and the main mold cavity 205 are used for molding the rod portion 6, and the wall thickness of the main mold sleeve 208 is determined according to the wall thickness of the rod portion 6. Preferably, the second mold 20 is a floating main mold, and the floating main mold can float and shape the first mold material, so that the precision of the product can be greatly controlled. Specifically, by using the nitrogen spring 206, the main die can perform floating forward extrusion on the bottom of the first die process material, so that the problem of wire root overlapping can be solved.

The third die cavity of the third die 30 performs the groove portion 2 and the tooth portion 3 on the wire rod, and the shape thereof matches the shape of the groove portion 2 and the tooth portion 3 of the clinch nut 100. As shown in fig. 5, the fourth die ejector 413 of the fourth die 40 is used for extending into the first inner hole 7 during forming, so as to protect the first inner hole 7 and prevent the head portion 1 and the flange 4 from being deformed during cold heading. The periphery of the fourth die ejector pin 413 is wrapped with a die sleeve 416, and the die sleeve 416 extends into the groove accommodating part 2 of the third die material and performs cold heading on the third die material. In this way, the dimensional accuracy of the groove receiving portion 2 and the tooth portion 3 of the clinch nut 100 can be greatly improved.

As shown in fig. 6, the periphery of the fifth punch pin 513 in the fifth die 50 is wrapped by a first punch set 516, and the periphery of the first punch set 516 is wrapped by a second punch set 517. The first die sleeve 516 is used for forming the flanging 9 of the accommodating groove part 2, and the second die sleeve 517 is clamped with the tooth part 3, so that the tooth part 3 is prevented from deforming in a cold heading process, and the flanging precision of the press riveting nut 100 can be improved. A discharge hole 5020 is further arranged in the fifth main mold core 502, specifically, a die of the fourth mold 40 is used for ejecting the waste between the first inner hole 7 and the second inner hole 8, and the ejected waste is discharged through the discharge hole 5020. The first bore 7 communicates with the second bore 8 to form the through bore 6.

The main die and the punch die of the sixth die 60 respectively have a main die trimming die and a punch die trimming die for removing the flash of the fifth die process material.

Preferably, the trimming die is composed of two halves, since the trimming dimensions are identical to those of the stem 5. The master molds of the first mold 10 to the sixth mold 60 are composed of two identical parts.

In addition, the main dies of the second die 20 to the fifth die 50 are all identical, the main die ejector pin 203 extends into the second inner hole 8, and the main die sleeve 208 acts on the rod portion 5, so that the second inner hole 8 is protected, and the rod portion 5 is prevented from being deformed in the cold heading process.

Since the clinch nut 100 is relatively flat and thin, a general clip cannot clamp a wire, and in the present embodiment, as shown in fig. 7 and 8, the clamping portion 701 of the clip 70 is formed in a stepped shape so as to be more closely clamped with a product, and thus is suitable for clamping such a flat product. The clip 70 is also made from two identical parts that are joined together.

The utility model also discloses a forming method of pressing rivet nut 100, include:

step 1: cold heading the wire to form the head 1, flange 4, stem 5 and through hole 6 of the clinch nut 100; the head part 1 comprises a groove containing part 2 and a tooth part 3;

as shown in fig. 2 and fig. 3, in the embodiment of the present invention, the step 1 specifically includes:

step 11: shaping a wire, preforming the first inner hole 7 at the top of the wire, preforming the rod 5 at the bottom of the wire, forming the second inner hole 8 at the rod 5 to obtain the first molding material, wherein the inner diameters of the first inner hole 7 and the second inner hole 8 are the same, but the end parts of the first inner hole 7 and the second inner hole 8 are close to each other but not communicated, so that the precision of the finally formed through hole 6 can be ensured; of course, the cutting operation of the wire rod is completed by a cutting mechanism in the cold header and the feeding operation of the wire rod is completed by the conveying mechanism of the cold header before this step.

Step 12: cold heading the first die work material to form the stem 5, and pre-forming the head 1 and the flange 4 to obtain the second die work material.

Step 13: cold heading the second die material in step 12 to form the flange 4, and pre-forming the groove-containing part 2 and the tooth part 3, the groove-containing part 2 being above the tooth part 3, the tooth part 3 being above the flange 4, to obtain the third die material.

Step 14: and (3) performing cold heading on the third die process material in the step (13) so as to form the accommodating groove part 2 and the tooth part 3, thus obtaining the fourth die process material.

Step 15: and (3) performing cold heading on the fourth die process material in the step (14), removing waste materials between the first inner hole (7) and the second inner hole (8) to form the through hole (6), and performing flanging forming on the accommodating groove part (2) to obtain the fifth die process material.

Step 16: and (5) performing cold heading on the fifth die process material in the step (15), and removing burrs to obtain the sixth die process material, namely the appearance and the through hole of the press riveting nut 100.

Step 2: tapping the through hole 6 of the clinch nut 100 manufactured in step 1, thereby forming a thread in the through hole 6.

And step 3: and (3) carrying out heat treatment on the press riveting nut 100 manufactured in the step (2). Specifically, the heat treatment is mainly an annealing treatment.

And 4, step 4: and (3) performing surface treatment on the press riveting nut 100 in the step (3). The surface treatment includes one or more of polishing, electroplating and corrosion prevention treatment, and in the present embodiment, a rust preventive oil is applied to the surface of the press-riveting nut 100 to prevent the press-riveting nut 100 from rusting and corroding.

The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. The utility model provides a forming mechanism of nut is riveted to pressure which characterized in that includes: the cold header is used for forming the groove containing part, the tooth part, the flange, the rod part and the through hole of the press riveting nut, is used for forming a tapping device of a thread in the through hole, is used for carrying out heat treatment on the press riveting nut after tapping, and is used for carrying out surface treatment on the press riveting nut.

2. The clinch nut forming mechanism of claim 1, wherein the cold header includes: blank mechanism, ejection mechanism, transport mechanism and six moulds, six moulds are first mould to sixth mould respectively, wherein, install cutting die and shear die in the die cavity of blank mechanism for cut off the material, six mould integrations are in the cold heading machine, ejection mechanism be used for with the product in the die cavity is ejecting, transport mechanism is in remove the pay-off between ejection mechanism and the six moulds, specifically, follow blank mechanism in proper order and convey first mould until the sixth mould.

3. The clinch nut forming mechanism of claim 2, wherein six of the dies include: a first die for shaping a wire and preforming a first bore at a top of the wire, forming a second bore at a bottom of the wire, a second mold for preforming the flange on the first mold material processed by the first mold, is used for carrying out flange forming on the second die technology material processed by the second die, a third die for preforming the groove part and the tooth part, and a fourth die for performing the groove part preforming and the tooth part molding on a third die process material processed by the third die, a fifth mould used for flanging and forming the groove containing part of the fourth mould process material processed by the fourth mould and removing waste materials between the first inner hole and the second inner hole, and the sixth die is used for removing the flash of the fifth die process material processed by the fifth die.

4. The forming mechanism of clinch nut of claim 3, wherein the first to sixth dies are composed of a master die and a punch die; the master mold includes: the device comprises a main die shell, a main die core, a nitrogen spring, a main die cushion block and a main die thimble, wherein the main die core, the nitrogen spring and the main die cushion block are arranged in the main die shell from top to bottom in sequence; the die includes: the stamping die comprises a stamping die mould shell, a stamping die core arranged in the stamping die mould shell, a stamping die thimble and a stamping die cushion block, wherein a stamping die cavity is arranged at the bottom of the stamping die core, and the stamping die thimble extends into the stamping die cavity from the stamping die core; the main die cavity corresponds to the die cavity and is used for fixing the wire.

5. The apparatus of claim 3, wherein the second mold is a floating master mold, and the floating master mold is a floating positive extrusion of the bottom of the first mold material.

6. The forming mechanism of the clinch nut as claimed in claim 3, wherein a punch sleeve is wrapped around an outer periphery of a fourth punch pin in the fourth die, the punch sleeve being inserted into the receiving groove portion of the third die material and cold-headed; the outer periphery of a fifth stamping ejector pin in the fifth die is wrapped with a first stamping sleeve, the outer periphery of the first stamping sleeve is wrapped with a second stamping sleeve, the first stamping sleeve is used for forming a flanging of the accommodating groove part, the second stamping sleeve is clamped with the tooth part, and a discharge hole is further formed in a fifth main die core.

7. The apparatus for forming clinch nuts as claimed in claim 2, wherein the transfer means is a clip, the clip being stepped, the clip being formed by two identical parts being sandwiched together.

8. The clinch nut forming mechanism of claim 3, wherein the master dies of the first die to the sixth die are assembled from the same two parts.