Manufacturing process of step drill for processing rivet holes of automobile brake pads
A technology of automobile brake and manufacturing process, which is applied in the direction of metal material coating process, coating, gaseous chemical plating, etc., can solve the problems of easy deformation, difficult control, and inapplicability of tantalum wire, so as to reduce processing cost and processing efficiency High, the effect of improving rigidity
Active Publication Date: 2015-01-14
CONPROFE TECH GRP CO LTD +1
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Problems solved by technology
Both of the above two coating methods adopt the method of rotating the workbench, and the tool is coated by heating the tantalum wire. However, the tantalum wire in the above method is easily deformed and difficult to control. The method of diamond coating will result in the phenomenon that part of the cutting edge of the step compound drill tool cannot be coated with diamond film or carbonization can not be effectively controlled due to temperature, so the above methods are not suitable for diamond coating of step hole drill tools
Method used
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[0020] The present invention is used for the step drill manufacturing process of automobile brake disc rivet hole processing, as figure 1 and as figure 2 shown, including the following steps:
[0021] (1), the cutter head 27 of tool steel and the cutter head 30 of YG6 cemented carbide are connected as one by brazing. knife point 26 and knife shoulder 29;
[0022] (2) Put the tool in a mixed solution of hydrochloric acid and nitric acid for pretreatment by ultrasonic cleaning;
[0023] (3) Put the pretreated cutter on the support 31 of the workbench in the reaction chamber 19, place the cutter bar 27 vertically with the cutter head 30 facing upwards, and arrange two carbonized cutters on both sides of the cutter head 30 Tantalum wire 25, four tantalum wires 25 are parallel in pairs, and the two tantalum wires 25 on each side are respectively arranged up and down, wherein the two tantalum wires 25 on the upper layer are 5-8 mm higher than the upper end surface of the tip 26 ...
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Abstract
The invention relates to a manufacturing process of a step drill for processing rivet holes of automobile brake pads. The manufacturing process comprises the following steps of: (1) connecting a cutter arbor made of tool steel and a cutter head made of YG6 hard alloy into an integral cutter by brazing; (2) placing the cutter into a mixed solution of hydrochloric acid and nitric acid to perform pretreatment in an ultrasonic cleaning way; (3) placing the cutter after pretreatment onto a workbench of a reaction chamber, keeping the cutter arbor vertical, upwards placing the cutter head, and respectively arranging two tantalum wires after carbonization treatment on each of the two sides of the cutter head; and (4) performing core formation and growth treatment on the surface of the cutter head in the reaction chamber, and finally depositing a layer of diamond thin film on the surface of the cutter head of the cutter. A coating disclosed by the invention adopts a method of arranging the tantalum wires in parallel like steps, so that the diamond thin film can be coated on different cutting blade parts of the step drill made of the hard alloy, and then the service life of the cutter of the step drill is greatly prolonged; and the manufacturing process can be widely applied to the high-efficient precision bath processing of the rivet step holes of the automobile brake pads, the processing cost is greatly reduced, and the processing efficiency is very high.
Description
technical field [0001] The invention relates to a manufacturing process of a machining tool, in particular to a manufacturing process of a step drill used for machining rivet holes of automobile brake pads. Background technique [0002] Automobile brake pads refer to the friction material fixed on the brake drum or disc that rotates with the wheel. The friction lining and friction pad in it are subjected to external pressure to generate friction to achieve the purpose of vehicle deceleration. Automobile brake pads are riveted to the brake drum through rivets, and the rivet holes are stepped holes with countersunk heads. In the actual processing of stepped holes on automobile brake pads, they are often directly drilled by carbide drills, and because the material of the brake pads is relatively hard, the tools used in processing the stepped holes are easy to wear, and the production efficiency is low. Realize mass production. On the other hand, during the drilling process, t...
Claims
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IPC IPC(8): C23C16/44
Inventor 向道辉赵重阳秦强杨广宾梁松王艳凤赵波高国富焦锋童景琳
Owner CONPROFE TECH GRP CO LTD