US20170072455A1

US20170072455A1 - Burr-freebolt forging mould

Info

Publication number: US20170072455A1
Application number: US15/258,145
Authority: US
Inventors: Hasan SEMSI; Yusuf KARABULUT
Original assignee: Berdan Arge Bilisim Yazilim Danismanlik Muhendislik Baglanti Elemanlari Uretim Ve
Current assignee: Berdan Arge Bilisim Yazilim Danismanlik Muhendislik Baglanti Elemanlari Uretim Ve Laboratuvar Hizmetleri Sanayi Ticaret AS; Berdan Arge Bilisim Yazilim Danismanlik Muhendislik Baglanti Elemanlari Uretim Ve
Priority date: 2015-09-11
Filing date: 2016-09-07
Publication date: 2017-03-16

Abstract

A positive extractor ensuring pressing of the bolt shaft belonging to the bolt draft with the force applied on Y-axis after reaching to upper head connection block, the bolt die module having the die connection block enabling connection of aforementioned positive extactor, and characterized with, containing the die having the die hole centered with the die connection block on aforementioned y-axis, different forms of brand die centered within the upper head connection block enabling burr-free production during shaping and enabling forming the pressed bolt shaft in different head shape, containing different forms of head die placed between different die and different forms of brand die.

Description

CROSS-REFERENCE TO RELATED U.S. APPLICATIONS

Not applicable.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

NAMES OF PARTIES TO A JOINT RESEARCH AGREEMENT

Not applicable.

REFERENCE TO AN APPENDIX SUBMITTED ON COMPACT DISC

Not applicable.

BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a manufacturing method where steel bolts are pressed and head form is hot forged without creating any burrs.
The present invention relates to a manufacturing method that eliminates the undesired excess metal that form following the hot forging, referred to as burr, which are removed in an additional operation called trimming on a separate workbench, using the steel rods cut to a certain length and one end heated.
2. Description of Related Art Including Information Disclosed Under 37 CFR 1.97 and 37 CFR 1.98
Steel bolts are mechanical fastening parts that are widely used in almost all fields and manufactured in fairly large volumes. Even small reductions from the manufacturing and transfer costs result in great savings. Likewise, small costs and small losses of time add up to great additional costs. This makes the factors of time, material and labor indispensable factors in steel bold manufacturing.
In steel bolt manufacturing using the former technique, burrs form at the bolt head section. This results in undesired excess metal formation, which in turn increases the material costs in steel bold manufacturing.
The technique, in the current situation, involves formation of excess metal, which has to be removed on a separate workbench in an additional operation step. This brings about the requirement of additional labor force and additional workbench to carry out this operation step.
Moreover, scrap costs in addition to labor costs as well as manufacturing times increase with the additional work of removing excess metal.
Today's friction presses that are employed to manufacture steel bolts by hot forging bolt heads consist of die to give the bolt various head forms and brand imprinter, as a single unit, and bolts are manufactured by forging this way, and then left to cool. In the current open die method, undesired burr of thickness of 2-3 mm, form during the forging between the surfaces where the lower die and upper die merge. The requirement of removing this burr increases labor costs, scrap costs as well as manufacturing times.
Literature researches show us various structures pertaining to the aforementioned bolt manufacturing methods. Utility model with application number 2005/04964, titled “Fastening Component Manufacturing System” is one of these methods. The mode summary reads: “Head form, subject to the utility model, a method of manufacturing bolts, screws, rivets, and other similar fastening parts using eccentric presses and pertaining system, consists of four assemblies, namely a conical forming assembly, bolt head preliminary forming assembly, reduction assembly and burr-free cutting assembly. In this method, one end of the coil shaped material is subjected to forming in a forming assembly, then conic shaped head section is forged to shape in preliminary forming assembly and then the section of material body where the threads will be made is brought to rubbing diameter in reduction assembly. Head section of the material whose body section is in rolling diameter is given its final form in burr-free cutting assembly”.
Too many process have been used in the aforementioned application which increases the manufacturing costs, aforementioned application is an example of certain disadvantages mentioned above.
Consequently, certain improvements are made in parallel to the advancing technology in bolt manufacturing methods, and therefore, new structures are needed to eliminate the disadvantages mentioned above and to bring solutions to existing systems.

BRIEF SUMMARY OF THE INVENTION

The present invention relates to hot forging method that meets all the aforementioned requirements, by eliminating all of the disadvantages and brings certain additional advantages, and related with burr-free bolt head manufacturing.
The purpose of the present invention is to eliminate the need for an additional machinery to be used for trimming operation to be carried out on eccentric press as a second operation following the forging as well as manufacturing or procurement of burr removal dies suitable for the bolt, and the labor force required for the aforementioned operation step.
Another purpose of the present invention is to eliminate the labor cost and time required for transporting to burr removal eccentric press of the bolts, manufactured with burrs and kept in a separate section for many hours in order for them to cool.
On the other hand, the present invention aims to eliminate by 2-5% material scraping that occur due to manufacturing of bolts with burrs.
Another purpose of the present invention is to eliminate cut marks because there is no cutting on the bolt head, which gives the bolts a higher quality look.
Yet another purpose of the present invention fabrication operation time and delivery time are reduced because one operation step is eliminated in bolt manufacturing, which results in lower bolt unit prices.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a perspective drawing of bolt die module subject to the present invention.

REFERENCE NUMBERS

10. Positive Extractor
20. Die fastening block
21. Fastening flange
211. Fastening parts
30. Die
31. Die block
32. Die hole
40. Head die of various forms
41. Marking die of various forms
42. Marking die of various forms
50. Upper head fastening block
51. Fastening parts
60. Bolt
61. Bolt Head
62. Bolt Shaft
A. Bolt die module

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1, the positive extractor (10) maintaining press by arriving upper head connection block (50) of bolt shaft (62) belonging to bolt draft with the force applied on y-axis, bolt die module (A) having the mould connection block (20) providing connection of mentioned positive extractor (10) are figured. In the aforementioned y-axis, die connection block (20) centered die hole (32) owning die (30) and brand die (42) in various forms centered in the upper head connection block (50) maintaining burr-free production while forming and ensuring the shape of head in different forms by the pressed bolt shaft (62). Aforementioned die (30) and different formed head die (40) located between different forms of brand dies(42) and aforementioned different forms of brand die (42) bolt die module (A) fixing different head formed brand die houses (41) are available. Also, housing level (31) is available for centering the aforementioned die (30) with the die connection block (20).
FIG. 1 indicates the perspective view of the bolt die module (A). Positive extractor (10) is available at the bottom of figure that enables forming of the bolt head (61) by supporting the bolt (60). Positive extractor (10) enters into the die connection (20) and supports the bolt (60). Aforementioned die connection block (60) ensures inter-connection of aforementioned positive extractor (10) and the die (10). Aforementioned die connection block (20) prevents unwanted movement of the die (30) with the pressure applied by the positive extractor (10) encapsulated in the die (30) with the connection flange (21). Aforementioned connection flange (21) is fixed to aforementioned die connection block (20) via fixation elements (211). As indicated above, the die (30) holding the bolt shaft (62) belonging to the bolt (60) within the connection flange (21) and die connection block (20). Head die (40) having a design that prevents burr forming while forming bolt head (61) in different head forms is available on the die (30). Head die in different forms (40) consists of different forms of brand die (42) shaping the bolt head (61) in different forms and brand die house (41) in different head forms fixing aforementioned different forms of brand die (42) to the bolt die module (A).
FIG. 1 shows the upper head connection block (50) at the upper section. Upper head connection block (50) is fixed via inter-connection elements (51) via different forms of head die (40). Upper head connection block (50) is shaped as the different forms of brand die (42) of bolt (60) with applied press force since different forms of brand dies (42) are located on the upper section.
The bolt die module (A) working principle is as follows.
When the operation is initiated, the different forms of brand die (42) connected to bolt die module (A) is moved with downwards direction (Y−) and one end is encapsulated along the downward movement direction (Y−) between the upper head connection block (50) and one end with the bolt shaft (62) positive extractor (10) by heating to the forging heat. Bolt head (61) of the bolt (60) with heated one end between different forms of head die (40) and different forms of brand die (42) shall be forged and formed as burr-free. Through movement of upper head connection block (50) towards backwards direction (Y+), head (61) shall be taken out from the die (30) as burr free and left in the case for cooling down.
Production steps burr-free bolt (60) containing the of Bolt die module (A) are as given below.

- placing induction device head side heated steel stick pieces within the die hole (32) having the same diameter with the heated steel part at the middle of lower die (30) connected to friction press table,
- successively placing steel stick centering die and different forms of head die (40) as tight-fit in the lower die (30),
- when the operation is initiated, different forms of head dies (40) connected to upper table of the press is moved downwards and encapsulating heated stick with one end heated to forging temperature with ongoing downwards movement between lower die and upper die,
- forming the head die (30) and steel stick with heated one end between different forms of head die (40) and forging as the burr-free,
- upon back upwards movement of the head die (30), taking out the head forged bolt as burr-free from the die housing and leaving for cooling down.

Claims

1. A positive extractor ensuring pressing of the bolt shaft belonging to the bolt draft with the force applied on Y-axis after reaching to upper head connection block, the bolt die module having the die connection block enabling connection of aforementioned positive extactor, and characterized with;

a die having a die hole centered with the die connection block on aforementioned y-axis,

different forms of brand die centered within the upper head connection block enabling burr-free production during shaping and enabling forming the pressed bolt shaft in different head shape,

containing different forms of head die placed between different die and different forms of brand die.

2. A bolt die module according to claim 1 and characterized by containing different head forms brand die bed fixing the aforementioned different forms of brand dies to the bolt die module.

3. A bolt die module according to claim 1 and characterized by containing a housing level centering the aforementioned die with the die connection block.

4. Y-axis applied forces bolt draft of bolt shaft of the upper head connection block positive remover allowing pressed to come, said positive extractor connection enables fitting mold block with a bolt pattern module containing the burr-freebolt the production method and characterized by the following steps:

placing induction device head side heated steel stick pieces within the die hole having the same diameter with the heated steel part at the middle of lower die connected to friction press table,

successively placing steel stick centering die and different forms of head die as tight-fit in the lower die,

when the operation is initiated, different forms of head dies connected to upper table of the press is moved downwards and encapsulating heated stick with one end heated to forging temperature with ongoing downwards movement between lower die and upper die,

forming the head die and steel stick with heated one end between different forms of head die and forging as the burr-free,

upon back upwards movement of the head die, taking out the head forged bolt as burr-free from the die housing and leaving for cooling down.