SELF -LUBRICATING DWELL CAM DRIVER

Field of the Invention :

The invention is related to the self-lubricating v-driver and cam dwell member of molding members of mechanical presses used for shaping metal sheet parts used in vehicle frames in the automotive sector.

Prior Art:

There are many automobile manufacturers in Turkey and Europe and the automotive industry is leaping forward with its increasing market share and competition. Especially at a time when costs are constantly increasing, automotive manufacturers place much emphasis on their costs to play a more active part in the market.

One of the indispensable raw materials of the automotive industry is the sheet material. The sheet material forms the whole frame of the car and acts as a structural member to form approximately 70% of the car. Metal sheet materials generally sourced from big steel plants are brought to the metal processing sections of automobile plants and there, the sheets are given the shapes and designs of vehicle frame parts to be manufactured by big mechanical presses. With the advancing technology, now size tolerances of the manufactured parts are decreasing, while higher quality and more precise manufacturing techniques come forward. Precise manufacturing techniques being very important for the automobile » industry are emphasized especially in terms of the no error manufacture principle for manufacturing and assembly of vehicle frame parts as well.

Today, many manufacturers use self-lubricating v-driver and cam dwell materials that can be used as molding members in mechanical presses for manufacturing sheet frame parts with such precise size tolerances. Such members are self-lubricating, and can be used in moving machine parts where high wear and friction occur.

As self-lubricating parts, v-drivers and cam dwells are used in molding members and v- drivers are comprised of male and female blocks. As female part, generally stainless steel or ck45 0.45% carbon-containing non-alloy steel is used, in v-driver lower male part and the cam dwell, high-resistance manganese bronze is used. Such bronze parts are generally used under heavy loads, in parts that require high resistance, but operating in low speeds and having high friction. Worn bronze in the v-driver or cam dwell corrodes and wears out the male block and makes it useless. The scrapped whole male block or cam dwell are made of bronze material and is a high-cost material in the market. For this reason, for both manufacturing and consuming companies, the material purchasing cost and the amount of scrapped material increase, which is reflected on the manufacturers' prices. The v-driver male bronze part or glass cam dwell slide surface have graphite holes for lubrication and these grooves are filled with graphite blocks bound together by various binders. As known, graphite has sliding and lubricating properties, it gives an extra lubricating property to the part. While there are no similar products to this one in terms of design in Europe and in Turkey, various self-lubricating molding elements are used that are available for use in various processes.

In the American patent no. 5718144, interlacing horizontal axis an cam dwell part moving by sliding on each other are used in the stamp press. The part includes an anvil placed on the guide shaft as .interlaced in the press and the anvil moves by sliding on this guide shaft. Whenever the guide shaft moves downwards, the cam dwell faces the anvils and interlaces with them. Anvil parts slide as dependent on each other. The shaft here becomes inclined and performs the sliding. Finally, the cam dwell goes into vertical position. It does so to hold the advancing sliding. Here, the cam dwell is used in an effort to reduce friction caused by sliding and as it does not include graphite, the lubrication is low and it does not reduce the friction stress to a sufficient degree, the part wears off rapidly.

In the Chinese patent no. 101664885, the invention is related to a v-shaped block member. The part is characterized by the inclusion of grooves on the surface. The part is manufactured as follows: Firstly, grooves are opened on the V-shaped surface. In the next stage, hard alloys are placed and fixed in the processed grooves. Finally, the V- shaped surface is sharpened. Hard alloys with an unusual coverability property protect the v-shaped block surface from wearing. However, hard alloys used here have a high cost as well as the friction energy occurring on the surface rises to high levels.

In the European patent no.2123923, a self-lubricating bushing structure is described. The bushing structure is comprised of a bush made of a porous material that can transfer and absorb the lubricant. There is an axle hole in the middle of the bush and through this hole, a shaft part of a motor passes. The grooves on the part hold oil. As the shaft rotates, the lubricating oil appears on the porous structures and starts lubricating the shaft. When the shaft stops rotating, the lubricant is drawn back to the grooves. The disadvantage here is that the part needs to contain an extra lubricant fluid for lubrication. This increases both the manufacturing and the part's maintenance costs, thus the maintenance costs of the machine where the part is used.

The invention is an alternative to the above-mentioned patents, and it significantly reducing the costs of using today's technology as well. Normally self-lubricating parts are manufactured of high-resistance manganese bronze and are discarded, as they wear off. The invention reduces the use of this bronze material and also allows the use of the material without compromising the friction and lubricating properties of the material. Explanation of the Figures:

Figure 1 The front view of the v-driver female part of the invention

Figure 2 The top view of the v-driver female part of the invention

Figure 3 The front view of the v-driver male part of the invention

Figure 4 The top view of the v-driver male part of the invention

Figure 5 The perspective view of the v-driver male part of the invention

Figure 6 The front view of the v-driver cam dwell of the invention

Figure 7 The top view of the v-driver cam dwell of the invention

Figure 8 The perspective view of the v-driver cam dwell of the invention

Figure 9 The front view of the assembled v-driver of the invention

Figure 10 The top view of the assembled v-driver of the invention

Figure 1 1 The front vie of the v-driver and cam dwell- of the invention in a different design

Figure 12 The perspective view of the cam dwell of the invention in a different design Figure 13 The top view of the cam dwell of the invention in a different design

Explanation of References: 1. Male block

2. Female block

3. Cam dwell

4. Lubricating graphite parts

5. Grooves

6. Assembly slots Explanation of the Invention:

The invention is related to a self-lubricating v-driver in the molding members of the mechanical presses used for shaping the metal sheet parts used in vehicle frames in the automotive sector and the cam dwell member, characterized by comprising a male block ( 1 ), Female block ( 2 ), cam dwell( 3 ), Lubricating graphite parts ( 4 ), Grooves ( 5 ), and Assembly slots ( 6 ).

Normally, the v-driver used in molding members of the mechanical presses is comprised of 2 parts and the male part is manufactured of bronze material, while the female part is made of stainless steel and CK45 steel material. However, both materials which are discarded as they wear off bring big materials losses as the female and male parts are also discarded and each part that is discarded brings big losses and costs to both the manufacturing and the consuming firms. Normally, the cam dwell used in molding members of the mechanical presses is comprised of 2 parts and one part is manufactured of bronze material, while the other part is made of stainless steel and CK45 steel material. However, both of the materials which are discarded as they wear off bring big materials losses and each part that is discarded brings big losses and costs to both the manufacturers and the consumer firms.

The invention is the solution to all these disadvantages as the part is retained with all the mechanical properties. The v-driver part includes a male block ( 1 ) and a female block ( 2 ) and both of the blocks are made of stainless steel or C 45 , 0.45% C steel. An cam dwell ( 3 ) is used between the two parts and with the friction between the male block ( 1 ) and the female block ( 2 ), the cam dwell ( 3 ) wears off. The cam dwell is manufactured from bronze .alloys with high-manganese-containing, therefore high- resistance and low-speed-functioning parts such as SAE 430 B, AMPCO or a sintered surface (Fe-Ni, Cu-Sn etc.) steel cam dwell. In traditional methods, the male block ( 1 ) is manufactured of whole bronze material and as the part wears off, the male block ( 1 ) and also the female block ( 2 ) are discarded completely and the consumer incurs great costs. The invention is the solution to all these problems and reduces the amount of the scrapped bronze part down to very low levels.

The male block ( 1 ) does not have lubricating graphite parts ( 4 ) which are included in cam dwell ( 3 ) or sintered cam dwel l ( 3 ) mounted on the male block ( 1 ). The female block ( 2 ) and the the cam dwell ( 3 ) mounted on the male block ( 1 ) rub against each other and move on the vertical or horizontal axis. With the friction created during their movement, as the lubricating graphite parts ( 4 ) or sintered surface on the cam dwell ( 3 ) of the male block ( 1 ) warm up, they release lubricant and minimize the wear on both blocks. The grooves ( 5 ) located in the middle of both the male block ( 1 ) and the female block ( 2 ) of the v-drivers are highly important to enable the easy fit between the male block ( 1 ) and the female block ( 2 ) and the assembly of the parts to the mechanical press. The assembly slots ( 6 ) by the sides of the grooves ( 5 ) of the male block ( 1 ) are used while assembling the cam dwell ( 3 ) on the male block ( 1 ) and mounted on the male block to avoid displacement of the part due to friction and different loads during operation.