CN1125699C

CN1125699C - Technology for machining top arc of teeth for thread rolling die

Info

Publication number: CN1125699C
Application number: CN00127682A
Authority: CN
Inventors: 王明卿
Original assignee: Shanghai Diesel Engine Co Ltd
Current assignee: Shanghai Diesel Engine Co Ltd
Priority date: 2000-12-01
Filing date: 2000-12-01
Publication date: 2003-10-29
Anticipated expiration: 2020-12-01
Also published as: CN1293100A

Abstract

The present invention relates to a technology for processing a tooth top arc of a tooth of a thread rolling die. In the technology for processing a top arc of a tooth of a thread rolling die, after inclined planes on both sides of the tooth of the thread rolling die is ground by a thread grinding machine, a single-line grinding wheel in an arc shape is rolled by a prefabricated single-line metal roller in an arc shape, a multiline metal roller in an arc shape is ground by using the single-line grinding wheel in an arc shape, a multiline grinding wheel in an arc shape is rolled by the multiline metal roller in an arc shape, and the tooth top arc of tooth of the thread rolling die is ground by the multiline grinding wheel in an arc shape. The grinding method of the present invention ensures the high accurate of the thread rolling die, the rolling thread accuracy of the present invention is greatly improved, a performance level can reach 12.9 grades, and an accurate level can reach 4 grades.

Description

The processing method of thread rolling die tooth form crest circular arc

(1), technical field:

The present invention relates to a kind of processing method of thread rolling die tooth form crest circular arc.

(2), background technology:

As everyone knows, use bolt very widely in the Course Exercise in Machinery Elements Design, its screw thread forms with the thread rolling die roll extrusion usually.According to existing document, the 23rd page of the 3rd joint of China's " regular screw threads " national standard (GB197-81) " Bottom of Thread shape " regulation, performance rate is greater than or equal to 8.8 grades securing member (by standard GB 38-76 bolt technical conditions), its external screw thread tooth return pulley exterior feature will have the slick and sly curve that connects, and the radius R of curved portion should be less than 0.125P (P be not a pitch).And size, the form accuracy of decision screw thread is size, shape and the precision of thread rolling die.The method of present domestic manufacturing thread rolling die, the one, adopt screw grinder processing, the thread rolling die tooth form crest that comes out of grinding can only be a flat-top like this, and production efficiency is very low; The 2nd, employing is carried out rolling and processing by thread rolling die and is formed before thread rolling die hardens, though can be cold-pressed into tooth form crest circular arc R with this method processing thread rolling die, but after hardening, heat treatment cause thread rolling die tooth form precision to reduce, by the accuracy of screw machining and the precision performance of its processing, the requirement that does not reach powerful screw thread thereupon reducing greatly.

(3), summary of the invention:

The purpose of this invention is to provide a kind of processing method, it can finish grinding to thread rolling die tooth form crest circular arc R with threader, thereby makes high-precision thread rolling die, rolls out the external screw thread of circular arc R at the bottom of the high-precision tooth form tooth with it.

The present invention realizes like this, a kind of processing method of thread rolling die tooth form crest circular arc, grind the inclined-plane, both sides and bottom of thread rolling die tooth form with screw grinder after, roll wheel rolling single line arc diamond wheel with prefabricated single line circular arc metal, grind multi-thread circular arc metal with the single line arc diamond wheel and roll wheel, roll the multi-thread arc diamond wheel of wheel rolling with multi-thread circular arc metal, with multi-thread arc diamond wheel grinding thread rolling die tooth form crest circular arc, the tooth form radius of rounded crest that prefabricated single line circular arc metal rolls wheel equates with the thread rolling die tooth form radius of rounded crest of preprocessing.

(4), description of drawings:

Fig. 1 is that the tooth form crest is the thread rolling die schematic diagram of circular arc R;

Fig. 2 is the local enlarged diagram of thread rolling die tooth form;

Fig. 3 is that single line circular arc metal rolls the wheel schematic diagram;

Fig. 4 is rolling single line arc diamond wheel schematic diagram;

Fig. 5 grinds multi-thread circular arc metal to roll the wheel schematic diagram;

Fig. 6 is rolling multi-thread arc diamond wheel schematic diagram;

Fig. 7 is a grinding thread rolling die tooth form crest circular arc R schematic diagram.

Among the figure, 1 is inclined-planes, tooth form both sides, and 2 is tooth form bottom, and 3 is thread rolling die, and 4 roll wheel for single line circular arc metal, and 5 is the single line arc diamond wheel, and 6 roll wheel for multi-thread circular arc metal, and 7 is multi-thread arc diamond wheel.

(5), the specific embodiment:

Embodiments of the invention are provided by following accompanying drawing.

As shown in Figure 1 and Figure 2, inclined-plane 1, thread rolling die tooth form both sides and bottom 2 are according to external screw thread pitch t and angle [alpha] screw grinder grinding moulding.

As shown in Figure 3, with No. 45 steel material, hardness is HRC (35～42), and by the design accuracy requirement, the single line circular arc metal that is processed into the tooth form radius of rounded crest and is R rolls wheel 4 by numerically controlled lathe, and radius R equates with the thread rolling die tooth form radius of rounded crest of preprocessing.

As shown in Figure 4, roll wheel 4 rolling single line arc diamond wheels 5 with single line circular arc metal.

As shown in Figure 5, grind multi-thread circular arc metal with single line arc diamond wheel 5 and roll wheel 6.

As shown in Figure 6, roll wheel 6 rolling multi-thread arc diamond wheels 7 with multi-thread circular arc metal.

As shown in Figure 7, with multi-thread arc diamond wheel 7 grinding thread rolling dies 3 tooth form crest circular arc R.

The present invention has realized on screw grinder thread rolling die tooth form crest circular arc R being implemented precise grinding process, thereby guaranteed the high accuracy of thread rolling die, accuracy of thread with its roll extrusion improves greatly, and performance rate can reach 12.9 grades (superlative degrees), and accuracy class can reach 4 grades.

Claims

1. the processing method of a thread rolling die (3) tooth form crest circular arc, after it is characterized in that grinding the inclined-plane, both sides (1) and bottom (2) of thread rolling die tooth form with screw grinder, roll the rolling single line arc diamond wheel of wheel (4) (5) with prefabricated single line circular arc metal, grind multi-thread circular arc metal with single line arc diamond wheel (5) and roll wheel (6), roll the rolling multi-thread arc diamond wheel of wheel (6) (7) with multi-thread circular arc metal, with multi-thread arc diamond wheel (7) grinding thread rolling die (3) tooth form crest circular arc, the tooth form radius of rounded crest that prefabricated single line circular arc metal rolls wheel (4) equates with thread rolling die (3) the tooth form radius of rounded crest of preprocessing.