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A processing method of welded extension drill bit
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A processing method and welding technology, which is applied in the processing field of welded extension drill bits, can solve the problem that the drill bit and the extension rod cannot obtain straight line accuracy, the coaxiality between the drill bit and the extension rod is difficult to guarantee, and deep holes are prone to waste products, etc. problems, to achieve the effect of ensuring processing quality, zero scrap rate of deep holes, and improving processing accuracy
Active Publication Date: 2017-06-23
HARBIN TURBINE +1
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[0003] The present invention aims to solve the problem that the coaxiality between the drill bit and the extension rod is difficult to guarantee in the existing welding-type extension drill bit processing method, and good straight line accuracy cannot be obtained after the drill bit and the extension rod are welded, and the processed deep hole is easy to produce To solve the problem of waste products, a processing method for welded extension drill bits is provided
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specific Embodiment approach 1
[0026] Specific implementation mode one: combine Figure 1 to Figure 7 Describe this implementation mode, this implementation mode is realized through the following steps:
[0027] Step 1. Machining the main body section 1-1, the cone section 1-2 and the auxiliary head 1-3 of the drill bit 1 on a common lathe: the drill bit 1 is the auxiliary head 1-3, the main body section 1-1 and the auxiliary head 1-3 from left to right. Cone section 1-2, the main section 1-1 car cylinder outer diameter is D+(0.6~0.7)mm, length is 220mm, according to the drawing size car cone section 1-2 cone outer diameter, its taper is 1:20 , and leave a machining allowance of 0.6mm to 0.7mm, the length is 40mm, the outer diameter of the auxiliary head 1-3 is d, the length is 15mm, and a 60° center hole is drilled at both ends of the drill bit 1, see figure 1 ;
[0028] Step 2, process the connection section 2-1, the empty knife section 2-2, the taper handle section 2-3, the transition section 2-4 and ...
specific Embodiment approach 2
[0039] Specific implementation mode two: combination figure 1 Describe this embodiment, this embodiment is the selection of the outer diameter d of the auxiliary head 1-3 in step 1: d≤1 / 3D, D is the outer diameter of the main body section 1-1 of the drill bit 1. Other steps are the same as in the first embodiment.
specific Embodiment approach 3
[0040] Specific implementation mode three: combination figure 1 Describe the present embodiment, the present embodiment is that the cutting parameters adopted when processing the main body section 1-1, the cone section 1-2 and the auxiliary head 1-3 of the drill bit 1 in step 1 are: rotating speed 400r / min, The feed rate is 0.3mm / r, and the cutting depth is 1.5mm. Other steps are the same as in the second embodiment.
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Abstract
A machining method of a welded type lengthened drill bit includes the steps that firstly, a body section, a cone section and an auxiliary head of the drill bit are machined on a lathe; secondly, a connection section, an idle stroke section, a conical handle section, a transition section and a flat tail of a lengthened rod are machined on the lathe; thirdly, a groove and a tooth back of the drill bit are milled on a horizontal milling machine; fourthly, the flat tail and a kidney-shaped hole are milled on the horizontal milling machine; fifthly, the cone section of the drill bit is ground on an outer circle grinding machine; sixthly, a conical hole is turned on the lathe; seventhly, a bench worker drills an exhaust hole till the size required by a drawing is achieved; eighthly, the drill bit and the lengthened rod are welded together to form the lengthened drill bit, and welding stress is removed after welding; ninthly, central holes in the two ends of the lengthened drill bit are ground through a grinder; tenthly, the blade outer circle of the lengthened drill bit is ground to reach the size required by the drawing, and the conical handle section is ground to reach the standard size of a Mohs 4 conical handle; eleventhly, a cutting point corner and a rear corner of the lengthened drill bit are rough and fine ground; and twelfthly, the gauge number is carved on the connection section of the lengthened drill bit and then machining of the welded type lengthened drill bit is completed. The machining method is used for machining the welded type lengthened drill bit.
Description
technical field [0001] The invention relates to a processing method for an extension drill bit, in particular to a processing method for a welded extension drill bit. Background technique [0002] The extended drill is a common tool for machining deep holes (such as the radial deep hole of the valve cover). The shape of the tool is as follows: Figure 7 As shown, the general extension drill bit adopts the welded structure type. The processing method of the existing welded extension drill bit is: firstly use the lathe to process the drill bit and the extension rod to the size of the drawing, and then weld the two together. The cutting front angle α and the relief angle γ of the rough and fine grinding extension drill bit on the grinder; the cutting front angle α in the present embodiment is 118 °; the welded extension drill bit processed by the above method has the following disadvantages: the drill bit and the extension bit The coaxiality of the rod is difficult to guarantee...
Claims
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