CN205110892U - Chamfer centre drill - Google Patents

Abstract

The utility model provides a chamfer centre drill, including a chamfer centre drill body, chamfer centre drill body both ends are drill bit portion, and wherein, the diameter phi d2 of drill bit portion and thread bottom hole diameter phi d1 equal, the length L2 of drill bit portion and thread bottom hole's flight depth L1 equal, both ends drill bit portion tail end is spired, and its cone angle alpha 2 and thread bottom hole's chamfer cone angle alpha 1 equal that the diameter size at a chamfer centre drill body middle part is greater than the diameter phi d2 of drill bit portion. The utility model provides a pair of chamfer centre drill changes the centre drill point diameter into and requires the thread bottom hole diameter, and extension front end length, guarantee thread length, require to manufacture corresponding angle according to processing, reached in drilling while chamfer, the axiality of the assurance conical surface and screw thread improves the machining precision, reduces processing step.

Description

A kind of chamfering centre drill

Technical field

This utility model relates to a kind of machining tool, particularly relates to a kind of a kind of chamfering centre drill used when the hydraulic pump part sealing processing conical surface and thread Pilot hole.

Background technology

As described in Figure 1, the sealing of plunger displacement pump part process oil through adopts conical surface seal usually, as cone seal plug 1, can improve sealing effectiveness, simple to operate;

Traditional procedure of processing: boring → expand thread Pilot hole → chamfering → tapping, because expansion thread Pilot hole and chamfering are processed in two steps, so cannot ensure the conical surface and thread coaxiality, may cause leakage when installing plug.

Utility model content

The purpose of this utility model is to provide a kind of a kind of chamfering centre drill improving machining accuracy.

The technical solution adopted in the utility model is:

According to an aspect of the present utility model, provide a kind of chamfering centre drill, comprise a kind of chamfering centre drill body, a kind of chamfering centre drill body two ends are bit head, and wherein, the diameter phi d2 of bit head is equal with thread Pilot hole diameter phi d1; The length L2 of bit head is equal with the depth of thread L1 of thread Pilot hole; Two ends bit head tail end is tapered, and its cone angle 2 is equal with the chamfering cone angle 1 of thread Pilot hole, and the diameter in the middle part of a kind of chamfering centre drill body is greater than the diameter phi d2 of bit head.

A kind of chamfering centre drill that the utility model provides, changes into centre drill point diameter and requires thread Pilot hole diameter; And lengthen front end length, ensure reach; Corresponding angle is manufactured according to processing request; Reach in boring chamfering simultaneously, ensured the axiality of the conical surface and screw thread, improve machining accuracy, reduce procedure of processing.

Accompanying drawing explanation

Fig. 1 is oil through sealing state figure.

Fig. 2 is oil through thread Pilot hole sectional view.

The structural representation of a kind of chamfering centre drill that Fig. 3 provides for the utility model.

Detailed description of the invention

Below in conjunction with drawings and the specific embodiments, explanation is described in further detail to the technical solution of the utility model.

Fig. 2 and Fig. 3 show schematically show a kind of chamfering centre drill according to a kind of embodiment of the utility model.

As shown in Figure 2, the depth of thread of thread Pilot hole is L1, and thread Pilot hole diameter is φ d1, and the chamfering cone angle of thread Pilot hole is α 1.

As shown in Figure 3, a kind of chamfering centre drill that the utility model provides comprises a kind of chamfering centre drill body 11, a kind of chamfering centre drill body 11 two ends are bit head 111, the diameter phi d2 of two ends bit head 111 is equal with thread Pilot hole diameter phi d1, the length L2 of bit head 111 is equal with the depth of thread L1 of thread Pilot hole, two ends bit head 111 tail end is tapered, its cone angle 2 is equal with the chamfering cone angle 1 of thread Pilot hole, and the diameter in the middle part of a kind of chamfering centre drill body 11 is greater than the diameter phi d2 of bit head 111.

A kind of chamfering centre drill that the utility model provides is chamfering while the bottom diameter bored needed for thread tapping and drilling depth, step is: boring → tapping, reduces procedure of processing, ensures the axiality of the conical surface and screw thread, avoid causing leakage when sealing screw plug is installed, improve precision.

The above is only the utility model preferred embodiment; it should be pointed out that to those skilled in the art, under the prerequisite not departing from the utility model creation design; can also make some similar distortion and improvement, these also should be considered as within the protection domain of utility model.

Claims (1)

1. a chamfering centre drill, comprise a kind of chamfering centre drill body (11), described a kind of chamfering centre drill body (11) two ends are bit head (111), it is characterized in that, the diameter phi d2 of described bit head (111) is equal with thread Pilot hole diameter phi d1; The length L2 of described bit head (111) is equal with the depth of thread L1 of thread Pilot hole; Described two ends bit head (111) tail end is tapered, its cone angle 2 is equal with the chamfering cone angle 1 of thread Pilot hole, and the diameter at described a kind of chamfering centre drill body (11) middle part is greater than the diameter phi d2 of bit head (111).