CN104708125B

CN104708125B - A kind of method of the safe tapping of Digit Control Machine Tool

Info

Publication number: CN104708125B
Application number: CN201510064291.5A
Authority: CN
Inventors: 杨基义
Original assignee: Supporting Co Ltd Of Ship Power In Anqing
Current assignee: Supporting Co Ltd Of Ship Power In Anqing
Priority date: 2015-02-06
Filing date: 2015-02-06
Publication date: 2017-06-16
Anticipated expiration: 2035-02-06
Also published as: CN104708125A

Abstract

The method that the present invention discloses a kind of safe tapping of Digit Control Machine Tool, the method first programs tapping with the first tap of screw tap in groups by normal cutting parameter, flexible tapping mode is used during secondary tapping, feed of every rotation during setting tapping is smaller than the pitch of the screw thread by 1/6, plug tap is set to have 1/6 bootup process of circumference when the helicoid that first tap is formed is entered, and make screw tap and passively followed up with the hysteresis of every turn of 1/6 spiral shell square in tapping process, can effectively prevent helicoid from misplacing.While the amount of feeding is reduced, it is necessary to make corresponding adjustment to tapping depth.This method is particularly well-suited to processing of the Digit Control Machine Tool to coarse thread screw of the aperture with the relatively running-deep-hole slightly larger than screwhole diameter.

Description

A kind of method of the safe tapping of Digit Control Machine Tool

Technical field

The invention belongs to mechanical manufacturing technology, it is related to a kind of method of the safe tapping of Digit Control Machine Tool.

Background technology

Many screwed holes are processed with the method for tap tapping in machine components.Screw tap is screw thread on processing equipment part The Common Use Tools in hole.The coarse thread screw of some more than diameter 30mm on steel component, aperture with slightly larger than screwhole diameter compared with Running-deep-hole, because tapping torque is big, scrap rate is big, and chip removal is difficult, is processed on Digit Control Machine Tool with regular tap and there is crowded wound The risk that screw thread, screw tap collapse tooth, screw tap fractures and causes workpiece to be scrapped.Common solution has：To the depth of thread and screw thread Screw of the diameter ratio less than 1.5 uses the machine tap with internal swarf passage of lengthening handle, the spiral shell of the ratio between the depth of thread and the diameter of thread more than 1.5 Hole uses the screw tap of cooling water hole in the big chip pocket band of large helix angle of lengthening handle, but these special screw taps are expensive； The first tap of the common screw tap in groups of useful first tap and plug tap composition is first pre- with maneuver mode on Digit Control Machine Tool Attack, to prevent helicoid from misplacing (being commonly called as " random tooth "), then with plug tap, method is attacked by hand is finished product, this method efficiency Low, form and position tolerance is difficult to ensure that, it is impossible to play the advantage of Digit Control Machine Tool.

The content of the invention

It is an object of the invention to overcome usual tapping method or high cost or the low shortcoming of efficiency, the present invention to provide a kind of With the method for the common lengthening handle safe tapping of screw tap in groups on Digit Control Machine Tool.

The purpose of the present invention is achieved through the following technical solutions：

A kind of safe tapping method of Digit Control Machine Tool, first uses first tap pre-tapped, and the one of screw thread is only cut off due to first tap Part surplus, the cutting moment of torque and scrap rate are small, potential safety hazard very little, so programming tapping by normal cutting parameter.During second tap Using flexible tapping mode, the flexible tapping handle of a knife from nose balance flexible function clamps screw tap, is reached in screw tap end face and attacked After silk safe distance, feed of every rotation during setting tapping is smaller than the pitch of the screw thread by 1/6, plug tap is being entered end threading Taper into helicoid when have 1/6 bootup process of circumference, and make screw tap in tapping process with the stagnant of every turn of 1/6 spiral shell square Passive follow-up is measured afterwards, can effectively prevent helicoid from misplacing.While the amount of feeding is reduced, it is necessary to according to formula D '=D/P × P ' makees corresponding adjustment to tapping depth.

Beneficial effects of the present invention：Screw tap safety on Digit Control Machine Tool is threaded with slightly in groups for the common lengthening handle of the present invention More than the screw of the relatively running-deep-hole of the diameter of thread, the cost of charp tool is greatly reduced, effectively prevents screw tap from collapsing tooth, screw tap and fracture and spiral shell Radial facing dislocation equivalent risk.

Brief description of the drawings

For the ease of it will be appreciated by those skilled in the art that the present invention is further illustrated below in conjunction with the accompanying drawings.

Fig. 1 is a kind of tapping instance graph of the screw of the relatively running-deep-hole with slightly larger than the diameter of thread.

Specific embodiment

Screw as shown in Figure 1, its screw specification is M36, and spiral shell square is P=4, and it is 54, thread Pilot hole that screw thread demarcates depth Depth is 70, and counterbore size is φ 38 × 130, and material is 35 steel, normalized condition.

Using common M36 × 4 × 280 lengthening handle in groups screw tap (first tap and plug tap) on horizontal digital-control lathe Processing.Normal procedure tapping is pressed with first tap first, program specifies tapping depth D routinely for screw thread demarcation depth adds 3 times Pitch, i.e. D=54+4 × 3=66, then use flexible tapping method, from the soft of nose balance flexible function with plug tap Property threading knife handle clamping screw tap, the feed of every rotation P ' during program setting tapping is smaller by 1/6 than spiral shell square P, i.e. P '=4 × (1-1/6) =3.33, the bootup process that make plug tap has 1/6 circumference when the helicoid that first tap is formed is entered smoothly enters, and Make screw tap and passively followed up with every turn of 1/6 i.e. hysteresis of 4 × 1/6=0.67 of pitch in tapping process, effectively prevent spiral shell Radial facing misplaces.

Corresponding to the passive follow-up of plug tap, it is necessary to which the tapping depth to being specified in program is adjusted accordingly：In tapping In program, the number of active coils n of screw thread is equal to the ratio D/P for specifying tapping depth D and specified feed of every rotation to be pitch P, be by Procedure auto-control, although the feed of every rotation P ' that plug tap is specified in tapping process is delayed, but it must be by every turn One pitch P is passively fed, and its axial difference (P '-P) is recompensed by flexible tapping handle of a knife, in order to ensure actual tapping depth Degree, then number of active coils n when must assure that secondary tapping is constant, i.e.,：D '/P '=D/P, that is,：D '=D/P × P ', D ' in formula It is the tapping depth specified in secondary tapping program.

The tapping depth specified in secondary tapping program in this example should be D '=66/4 × 3.33=55.Flexibility is attacked in this example Silk handle of a knife nose balance total amount is D '-D=55-66=-11, i.e., 11 to hole depth directional compensation, that is, flexible tapping handle of a knife quilt Elongate 11.If being processed screw hole depth larger (i.e. number of active coils is larger) and making nose balance amount beyond flexible tapping handle of a knife Safe compensation range, P ' can change to take 1/8 pitch hysteresis smaller than spiral shell square P.

Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims

1. the method for the safe tapping of a kind of Digit Control Machine Tool, it is characterised in that the method is comprised the following steps：First with screw tap in groups First tap programs tapping by normal cutting parameter；Then during tapping secondary with plug tap, often rotating into during setting tapping It is smaller than the pitch of screw thread by 1/6 to measuring, plug tap is had 1/6 guiding of circumference when the helicoid that first tap is formed is entered Process, and make screw tap and passively followed up with the hysteresis of every turn of 1/6 spiral shell square in tapping process；Plug tap uses flexible tapping Method, the flexible tapping handle of a knife from nose balance function clamps screw tap, is passively fed according to every turn of pitch P, its axial direction Difference P '-P are recompensed by flexible tapping handle of a knife, wherein, P is spiral shell square, feed of every rotation when P ' is program setting tapping.

2. the method for the safe tapping of a kind of Digit Control Machine Tool according to claim 1, it is characterised in that during the secondary tapping While the amount of feeding is reduced, corresponding adjustment is made to tapping depth by relational expression D '=D/P × P '.