EP0481112A1

EP0481112A1 - Method to produce an integral cap-nut

Info

Publication number: EP0481112A1
Application number: EP90119908A
Authority: EP
Inventors: Wen Su
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-10-17
Filing date: 1990-10-17
Publication date: 1992-04-22

Abstract

This invention relates to a method of producing an integral cap-cut and in particular to a machine that can precisely cut raw material, machine the head to hexagonal and the shank to cylindrical shape then through squeezing and forming procedures to form the bottom portion of the hexagon in an arc shape and the upper portion with flats.

Description

BACKGROUND OF THE INVENTION

Ever since the Industrial Revolution, machines have been widely adapted in production and the requirement trend is in a stable and gradually increasing for they have so many merits that man power can hardly catch up with. Such as, hard work, no emotional or pay raise problems....etc.. However, some subassemblies still can not be produced in mass and economically with the present machine.
The inventor, has therefore, invented this method which is able to mass and economically produce screwnut.

SUMMARY OF THE INVENTION

It is the primary object of the present invention to provide a method to integrally produce screwnut which can increase the quality of production.
It is another object of the present invention to provide a method to integrally produce screwnut which can increase the quantity of the products.
It is still another object of the present invention to provide a method to integrally produce screwnut which can minimize the waste of raw material during production.
It is a further object of the present invention to provide a method to integrally produce screwnut which can produce safer screwnuts which prevent people from scratched by the sharp end of a shank or a nut.
It is still a further object of the present invention to provide a method to integrally produce screwnut which can prolong its service life.
Other important features and advantages of the invention will become apparent during the course of the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of the present invention;
FIG. 2a is a flow chart of the production line of the present invention;
FIG. 2b, 2c and 2d are three production line of the present invention;
FIG. 3 is a prior art with welding method to produce capnut;
FIG. 4 is another prior art with riveting method to produce capnut; and
FIG. 5 is also a prior art with machinery method to produce capnut.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

It may now be seen to FIG. 1, that the present method generally comprises the following step. The first step of this invention is to cut precisely raw material and conveyed into a forge machine which implements five steps at each movement. The five steps are shearing, trimming, pressing, extrusion and form. The first step, shearing is to shear exactly size required out of the raw material then conveyed to the trimming processing which trims the granual finish out from the raw material and also to buff pulish the shearing end of the material. The third step, pressing, means to press the raw material to form into a hexagonal shaped body and conveys this body to the extrusion step which utilizes forward extrusion method to form its bottom portion of the body into a cylindrical shaped body and forge the top portion of the hexagonal body with teeth and completed the produce procedure. All of the above mentioned procedures are processed with automation operation which has a few points to be considered.

1. Auto feeding which mainly consists of a sam, a ratchet and a conveyer. When the sam starts to rotate which activates the ratchet to rotate simultaneous. When the ratchet rotates to an angle, the conveyer starts to feed; that is the conveyer will feed at every 2_7Te . Should the tangent between the conveyer and the point raw material louched is 'D', the auto machine will feed with πD-2π/θ = De/2 at each feeding. If zero loss of raw material is required during proceeding, since the feeding control is one of the major consideration for production, 0 angle is an important factor. Take 'V' represents the screw nut, 'd' represents the diameter of raw material and '1' as the feeding length, the formular will be "V=πd²xl" which means that the feeding length "I=4V/πd²" so Dθ/2=4V/πd² and therefore, θ=8V/πd²D. Once the 0 angle is known, it is only necessary to adjust a feeding arm to make the angle of the ratchet equals to 8V/_7Td²D at every spining.
2. Autoclamp and convey which are the basic requirements for automotion operation. Every time when a mold is punched nut by a knocknut, a clamp will clip the mold and conveyed to next processing. There are many different models of clamps according to their functions. One of the models is a horizontal moving clamp 6 which has a center axle 13 connected to a linking shaft 4 of a revolving sam (shown as in FIG.2d) and clips the mold with two springs 7 on its two sides to push the shaft inwardly so as to clip a mold when conveying. The clamp 6 has a cutter 11 and a shearing mold 12 to cutter raw material (shown as in FIG. 2b) while a which will hold the cutted raw matrial and bring to the next processing area. The next step is to turn the clamp 180 degree to convey the raw material to the following step with another side faces up. This turning is by installing a wheel 4 on the center axle 13 and to coupe with a chain 10 to have it done. In general function of this auto conveying (please refer to FIG. 2d). The revolving sam when activated, will bring the linking shaft 4 to move straight. Upon reaching to the right hand side of the FIG. 2d, the cutter 11 and the shearing mold 12 will cut the raw material which then slipped and conveyed to next step which has the raw material trimming, pressing, extrusion and form in one processing. After this processing, the revolving sam will bring the linking shaft 4 to move left (the material is still in the mold 14). When clamp 6 has moved to the leftmost position, the material will be pushed out by the knockout and moved to the next step and the above procedure is repeating its performance. The discussion now may be made to the FIG. 2a which shows that after the raw material been cut by the cutter and the shearing mold it is conveyed to trim out the granual finish from the raw material and buffs polish the shearing end. The next step is to the pressing which presses the raw material to form into a hexagonal shaped body and conveys this body to the extrusion which utilizes forward extrusion method to form its bottom portion of the body into a cylindrical shaped body and forge the top portion of the hexagonal body with teeth and the final step is to use combination extrusion to forge the teeth with required depth and the cap into arc shape. Because of this automation process is equal to 120 pieces every minute. The present invention has increase the production up to 20 times to the prior art. Nevertheness, the waste of raw material is close to zero; it may be mass produced; the cap is not easy to loss; polished surface makes it looks like an ornament; not easy to oxidize because of its integrally formed body, has no any gap; specification unified; low cost makes it maoe competative than others.

Claims

1. A method to produce an integrally screwnut is characterized with the following steps;

cut, trimm, press, extrusion and form; said cut utilizing a cutter and a shearing mold to cut evenly raw material; said trim griding out all granual finish; said press forging the raw material into a hexagonal shaped body; said extrusion extruding the bottom portion of the hexagonal shaped body into cylindrical and the top into a reversed hexagonal shape; said form utilizing combination extrusion to forge to a required depth and shape;

2. A method to produce an integrally screwnut, claimed as in claim 1, wherein the conveyance of raw material between each steps is done by a clamp which may rotate in 180 degrees;

3. A method to produce an integrally screwnut, claimed as in claim 1, wherein the automation conveyance is utilizing a revolving cam, a ratchet and a conveyer; said revolving cam activate said ratchet to rotate an angle which linking said conveyer to feed and the feeding is depending on the angle times the touching point of the material and divided by 2;

4. A method to produce an integrally screwnut, claimed as in claims 1 and 3, wherein the feeding length is controled by the rotating angle of said ratchet which angle shall be eight times of the screwnut divides the tangent of the material tough point, _7T value and the diameter square of the raw material that is 0 ₌ 8V/-ff d2D;

5. A method to produce an integrally screwnut, claimed as in claim 1, which includes the screwnut that is integrally made in comply with this method;

6. A method to produce an integrally screwnut, claimed as in claim 1, wherein the first step of the production procedure is to cut raw material evenly then trim all granual finish out of the material, then forge to a hexagonal shaped then shape the bottom into a cylindrical and utilizing combination extrusion to forge the teeth and cap to required depth and shape.