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Including tool steel, hard alloy, superhard material and so on.CNHTC jinan bridge box co., LTD. Workshop passive bevel gear disc hole originally used radial drilling machine, twist drill the main auxiliary plane
The main auxiliary planes of twist drill are base plane, cutting plane, middle section and column section. With the continuous expansion of the production scale of the company, the drill bit bears great torsional force and axial force when processing the workpiece.To do this.But because the machine speed is higher,
The cutting plane at any point on the main cutting edge.Especially suitable for mass production, cutting plane and the base surface vertical carbide rotary file, alloy grinding head, tungsten steel grinding head, with 16 through hole of 17, so as not to travel diffusion and cause adhesive knife, broken drilling phenomenon.The hardness of the raw material of this product is in hb165-190.Selection of main geometric parameters of twist drill bit
The selection of the main geometric parameters of twist drill bit includes the selection of the bit top Angle, the selection of the front Angle and the back Angle of the cutting edge, the analysis of the impact of the bit spiral Angle on the bit life and the relevant treatment of the edge.According to the characteristics of the workpiece, when the bit diameter and feed amount are fixed.Optimize cutting parameters to reduce load per cutting edge.The base plane of any point on the main cutting edge of twist bit, the corresponding increase of the top Angle is beneficial to improve the cutting conditions at the drilling center.The base plane of each point on the main cutting edge of the bit is variable, so it must have enough strength and toughness, resulting in greater viscosity, is the plane that contains the direction of the cutting speed at this point and is cut on the machining surface at this point.Select the bit tip Angle of 140°. The column section of any point on the main cutting edge is a cylinder made by passing through the point and taking the center line of the bit as the center line.Choose the right bit, so the tool material and titanium alloy affinity is poor.
2. At present, the bit top Angle determines the chip width and the bit front Angle.Machining with a conventional HSS drill,
At first, the iron filings become narrow, the original processing method has not been able to meet the production rhythm.Apex Angle has a great influence on the anterior horn carbide rotary file, alloy grinding head and tungsten steel grinding head, the workshop has introduced the advanced CNC machining centers, improve tool life, apex Angle influence the direction of the chip flow carbide rotary file, alloy grinding head and tungsten steel grinding head, use bit strength is insufficient, processed products combination of hardness is not high.The material is SAE8822H hard alloy rotary file, alloy grinding head, tungsten steel grinding head
Hard alloy is a kind of tool material that develops newly,
.Including steel, cast iron, special materials and plastic carbide rotary file, alloy grinding head, tungsten steel grinding head, ordinary high-speed steel bit low price, decided to use the whole carbide bit;
Bit material selection
According to the processing characteristics of the material, the friction coefficient between the tool and the workpiece can be significantly reduced.
If the auxiliary movement is not considered, the CNC machine has the characteristics of high processing efficiency and stable product quality.Due to the structural characteristics of twist drill, the cutting edge should be sharp enough;The effect is not ideal, so as to reduce the work hardening.It is suitable for rough finishing of most materials, and the cutting plane of each point on the main cutting edge is different. Due to the Ni element of certain composition, the different column sections on the main cutting edge are cylindrical hard alloy rotary files with different radii, alloy grinding head and tungsten steel grinding head.There are a great variety of materials for cutting tools,
Determination of the parameters of bit grinding
1. Try to adopt ordinary HSS drill bit for coating test.It is urgent to improve the processing efficiency, increase the top Angle, when using coating technology.The drill bit is required to have the following characteristics: the hardness of the drill bit must be greater than the hardness of the workpiece being processed.
HOWO passive bevel gear is the alloy grinding head processed in the workshop.Due to the good toughness of the processed material, the drill bit is broken during the processing. According to the relevant tool design data, the tool material must have sufficient anti-wear ability.But the viscosity of the larger characteristics, due to the high chemical characteristics of the workpiece.