CN1046299A - Tools for rolling screw-threads - Google Patents
Tools for rolling screw-threads Download PDFInfo
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- CN1046299A CN1046299A CN 89102283 CN89102283A CN1046299A CN 1046299 A CN1046299 A CN 1046299A CN 89102283 CN89102283 CN 89102283 CN 89102283 A CN89102283 A CN 89102283A CN 1046299 A CN1046299 A CN 1046299A
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- die
- targeting part
- screw
- screw die
- length
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Abstract
Thread rolling tool has adjustable die and fixing screw die, and each screw die has targeting part and calibrated section.Length (the L of each targeting part of adjustable die
3) and the fixing length (L of the calibrated section of screw die
6) by by the diameter of rolled thread decision, the fixedly length (L of the targeting part of screw die
5) be the fixing length (L of screw die
2) and be somebody's turn to do the fixedly length (L of the calibrated section of screw die
6) poor, and the targeting part of each screw die and the angle between the calibrated section (α) arc tangent of angle (arctg) thus is by the pitch of rolling screw-threads (P) and the fixing length (L of the targeting part of screw die
5) decision.
Description
The present invention relates to the stress metal manufacture field, more particularly, relate to thread rolling tool.
The present invention can apply to have the screw thread automatic rolling machine of dull and stereotyped tooth like a bomb, in order to rolled thread on difficult-to-deformation material bolt, pin, screw and like parts.
In addition, the present invention also can apply to rolled thread on the ordinary steel workpieces.
The structure of well-known thread rolling tool contains movable and fixing screw die, and feeding part, calibrated section and output section are arranged on screw die.Produce very big tangential force during with this instrument rolled thread, cause screw thread to slide and the instrument rapid wearing.
At present in the metallic article production field rising direction be development at a high speed, high efficiency can be on difficulty distortion and high-strength material product the automatic rolling machine of rolled thread.Yet, improve rolling speed and be subjected to the series of factors restriction.At first, the life-span of thread rolling tool is very low under high speed.Secondly, when the high speed rolling screw thread, must overcome huge deformation drag, when biting blank blank be quickened rapidly with assurance screw die targeting part.
Russian Patent (SU, A, 1162538) has been announced a kind of instrument that is used for rolled thread on bolt, screw, pin and like parts.This instrument contains adjustable die and fixing screw die, and each screw die is shaped on targeting part at its working surface two ends, is calibrated section between targeting part.The fixed head toilet article have targeting part, and its length can be determined by following formula:
(P)/(tgφ) - b（1）
a＝K
In the formula: a-is the length of screw die targeting part fixedly,
The K-coefficient equals 0.6～0.7,
P-pitch,
The angle of φ-adjustable die targeting part,
The length of b-adjustable die targeting part
At this moment the angle φ of adjustable die targeting part is identical with the angle φ of fixing screw die targeting part, and is determined by following formula:
φ＝1400 (P)/(a) ±5 （2）
The deformation extent of blank can change internal thread depth of section increment with 1/2 and represent.
Roll extrusion power and tangential contact stress depend on the amount of instrument incision blank, and the size of this amount depends on the structure of screw die guiding and calibrated section.This shows the size of the structure influence roll extrusion power of thread rolling tool and the service behaviour of instrument.
Known the condition of carrying out of stable nonslipping horizontal oblique milling process, this condition also can be used for characterizing rolled thread, and the condition that blank produce to slide is, when coefficientoffriction surpasses its limiting value μ ' time, promptly
μ＞μ′ （3）
According to the constant law of tangential stress
μ＝ (τ)/(σ) （4）
In the formula: τ-tangential contact stress,
The yield limit of σ-blank material,
Therefore, by formula (3) as can be seen, in order to guarantee should to satisfy following condition along institute's deformation path of depositing rolled thread fricton-tightly reliably:
(τ)/(σ) ＞μ′ （5）
So (τ)/(σ) value is to influence the principal element that blank slides.
The ratio of (τ)/(σ) usually surpasses the coefficient of friction limiting value in this instrument.So just cause that blank slides on the targeting part of screw die, that is to say to cause job insecurity.Because the slip of blank greatly reduces the life-span of thread rolling tool and rolls out the quality of screw thread.During rolled thread, this difficulty is bigger on the less-deformable steel product.
The purpose of this invention is to provide a kind of thread rolling tool, when the rolling screw-threads that carries out on high-speed equipment on the less-deformable steel blank, the geometry of tool work part can guarantee the long and reliable fricton-tight work of the life-span of instrument.
The measure of finishing above-mentioned purpose of the present invention is to rely on to have the adjustable die and the fixing thread rolling tool of screw die, wherein each screw die is shaped on targeting part at its working surface two ends, between two targeting parts, calibrated section is arranged, the surface of targeting part and the surface of calibrated section are acute angle, the length of instrument adjustable die targeting part is in 0.1D to 2.0D scope, and fixedly the length of screw die calibrated section in 3.0D to 5.0D scope
In the formula: D-screw thread nominal diameter.
Fixedly the length of screw die targeting part is determined by following formula:
0.5（L
2-l
6）
In the formula: L
2-fixing the length of screw die,
l
6-fixing the length of screw die calibrated section,
And the α angle of each screw die targeting part can be calculated as follows:
α = arctg (λP)/(l
6)
In the formula: λ-coefficient lambda=0.2～0.3;
P-pitch.
When the physical dimension of the above-mentioned instrument of Que Dinging can guarantee on high-speed equipment the screw thread on the roll extrusion less-deformable steel blank like this, long and reliable operation of the life-span of instrument.
When the angle of screw die targeting part exceeds the optimum value that above-mentioned formula determines, produce (τ)/(σ) peak value greatly at the screw die targeting part, it causes blank to slide and the instrument rapid wearing.
When adopting the screw die of structure of the present invention, above-mentioned phenomenon can not take place.
When the size of the size of fixing screw die calibrated section or adjustable die targeting part surpasses specified limits, produce (τ)/(σ) peak value at the targeting part of screw die, this can cause blank to slide and the instrument rapid wearing.When screw die calibrated section and targeting part had optimum value, this phenomenon can not take place.When the length of adjustable die feeding part is zero, on blank, may form the impression of adjustable die end acute angle.In addition, if the angle of adjustable die feeding part is when fixedly the angle of screw die feeding part equates, the clamping improvement of terms.Therefore, the lower limit of adjustable die feeding part length should be got minimum of a value, at this moment just can not form impression.When the length value of the fixing calibrated section of screw die during less than 3.0D, the ovality of diameter increases, can be above 8 grades by the precision of rolled thread.
Must be by targeting part to the transition of calibrated section by the radius manufacturing.Screw die targeting part to the rapid transition meeting of calibrated section causes very big load, thereby reduce thread quality and quicken tool wear, the screw die targeting part to calibrated section for to seamlessly transit under the situation of (pressing radius), can not produce additional load, at this moment improve life tools.
Following the present invention is elaborated with reference to accompanying drawing with specific embodiment, and total figure of thread rolling tool shown in the figure is a cross-sectional view.
The thread rolling tool of recommending by adjustable die 1 and fixedly screw die 2 form.The length L of adjustable die 1
1Than the fixing length L of screw die 2
2Want big.Have targeting part and the calibrated section that is positioned at two ends on the working surface of each screw die 1,2.The targeting part of adjustable die 1 is equal to each other, and with label 3 signs, its length is l
3The calibrated section of adjustable die 1 is between targeting part 3, and with label 4 signs, its length is l
4Fixedly the targeting part of screw die 2 is equal to each other, and with label 5 signs, its length is l
5Fixedly the calibrated section of screw die 2 is between its targeting part 5, and little label 6 indicates that its length is l
6
According to the present invention, the length l of the targeting part 3 of adjustable die 1
3In 0.1D to 2.0D scope, in the formula: the rolling screw-threads diameter of D-blank 7; The fixing length l of screw die 2 calibrated sections 6
6In 3.0D to 5.0D scope.The fixing length l of the targeting part 5 of screw die 2
5Determine by following formula: 0.5(L
2-l
6).
Screw die 1 and 2 targeting part 3 and 5 angle [alpha] are determined by following formula:
Arc tg (λ P)/(l
5), in the formula: λ-coefficient equals 0.2～0.3, P-pitch.
It is as follows to carry out the rolling screw-threads process with the instrument of suggestion: be fixed on the adjustable die 1 on the slide block 8, move back and forth with respect to the fixedly screw die work that is fixed on the support 9 along arrow B-B.Send into the blank 7 of the targeting part 3,5 of screw die 1,2, by wedging between the two, and because the translational motion of adjustable die 1 and do gyration along arrow ω.Blank 7 undeformed parts owing to rotate near instrument and begin metal deformation.
The test of being carried out during rolled thread on having the carbon steel of high deformation drag by the present invention in advance shows that the life-span of instrument on average improved 0.3～0.5 times than existing instrument.
In addition, the quality and the amount of labour that has reduced fabrication tool of rolling screw-threads have been improved.
Claims (1)
- A kind of thread rolling tool, have adjustable die (1) and fixing screw die (2), each screw die (1,2) is shaped on targeting part (3,5) at its working surface two ends, and be positioned at calibrated section (4,6) between the targeting part (3,5), be acute angle (α) between the calibrated section (4,6) of the surface of targeting part (3,5) and each screw die (1,2), it is characterized in that: the length (l of each targeting part (3) of adjustable die (1) 3) in 0.1D to 2.0D scope, the fixing length (l of screw die (2) and calibrated section (6) 6) in 3.0D to 5.0D scope (in the formula: D-is by the nominal diameter of rolled thread), the fixing length (l of the targeting part (5) of screw die (2) 5) by formula 0.5 (L 2-l 6) determine (in the formula: L 2-fixing the length of screw die (2)), the angle (α) of each targeting part (3,5) of each screw die (1,2) is by formula tg (λ P)/(l in addition 5) decision (in the formula: λ-coefficient 0.2～0.3, P-pitch).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102283 CN1046299A (en) | 1989-04-14 | 1989-04-14 | Tools for rolling screw-threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102283 CN1046299A (en) | 1989-04-14 | 1989-04-14 | Tools for rolling screw-threads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1046299A true CN1046299A (en) | 1990-10-24 |
Family
ID=4854627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89102283 Pending CN1046299A (en) | 1989-04-14 | 1989-04-14 | Tools for rolling screw-threads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1046299A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081497C (en) * | 1997-11-14 | 2002-03-27 | 唐宗才 | Threading tool for rolling compound thread and processing method thereof |
| CN101829746A (en) * | 2010-04-08 | 2010-09-15 | 帅汉周 | External thread processor for two-end screw |
| CN107530763A (en) * | 2016-03-18 | 2018-01-02 | 株式会社三秀 | Thread part screw plate and rotary rolling mill method |
-
1989
- 1989-04-14 CN CN 89102283 patent/CN1046299A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081497C (en) * | 1997-11-14 | 2002-03-27 | 唐宗才 | Threading tool for rolling compound thread and processing method thereof |
| CN101829746A (en) * | 2010-04-08 | 2010-09-15 | 帅汉周 | External thread processor for two-end screw |
| CN107530763A (en) * | 2016-03-18 | 2018-01-02 | 株式会社三秀 | Thread part screw plate and rotary rolling mill method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |