CN105345172A - Method for machining internal thread of blind hole without tool withdrawal groove - Google Patents
Method for machining internal thread of blind hole without tool withdrawal groove Download PDFInfo
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- CN105345172A CN105345172A CN201510888233.4A CN201510888233A CN105345172A CN 105345172 A CN105345172 A CN 105345172A CN 201510888233 A CN201510888233 A CN 201510888233A CN 105345172 A CN105345172 A CN 105345172A
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- blind hole
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Abstract
The invention discloses a method for machining an internal thread of a blind hole without a tool withdrawal groove. The method comprises the steps that the machining specification parameter of the thread of the blind hole to be machined is obtained; a corresponding tool is selected and the cutting allowance is obtained according to the machining specification parameter of the thread so that the cutting feeding distance can be determined, and the initial position of the cutting feeding distance is located at an opening of the blind hole to be machined; and the thread is machined on the blind hole to be machined through the tool according to the cutting feeding distance. According to the method for machining the internal thread of the blind hole without the tool withdrawal groove, the thread machining precision is improved, and the quality of the thread is improved; the service life of the tool is prolonged, and the use cost of the tool is greatly reduced; machining efficiency is improved.
Description
Technical field
The present invention relates to mechanical field, especially, relate to a kind of female thread machining method without escape blind hole.
Background technology
Numerical control turning screw thread is comparatively extensive in the application of screw thread process field, but still immature for the process technology without the accurate internal thread of escape blind hole at present.Because endoporus is without escape, cutter turning thread termination place, chipping allowance increases suddenly, and cutting force suffered by cutter is increased suddenly, as easy as rolling off a logly causes point of a knife tipping; And when cutter withdrawing direction setting is unreasonable, easily damage manufactured screw thread; In addition, because aperture is less, the iron filings produced in working angles in time outside evacuation aperture, easily cannot occur that blade is squeezed by iron filings and hinder phenomenon; Thus causing this quality instability without the accurate internal thread numerical control workshop of escape blind hole, cutter consumption large, working (machining) efficiency is low, has a strong impact on production.
Therefore, without the quality instability of the accurate internal thread numerical control workshop of escape blind hole and the consumption of cutter, be a problem demanding prompt solution.
Summary of the invention
The invention provides a kind of female thread machining method without escape blind hole, to solve the technical problem without the quality instability of the accurate internal thread numerical control workshop of escape blind hole and the consumption of cutter.
The technical solution used in the present invention is as follows:
Without a female thread machining method for escape blind hole, comprise step:
Obtain the screw thread process specifications parameter of blind hole to be processed;
According to screw thread process specifications parameter, selected corresponding cutter and acquisition chipping allowance are to determine to cut feed distance; Wherein, the start position cutting feed distance is positioned at the opening part of blind hole to be processed;
Use cutter to treat processing blind hole according to cutting feed distance and carry out screw thread process.
Further, screw thread process specifications parameter comprises the specification size of screw thread, thread material and thread angle.
Further, according to screw thread process specifications parameter, the step of the selected cutter corresponding with screw thread process specifications parameter comprises:
According to specification size and the thread material of screw thread, selected specification size with screw thread and the suitable cutter of thread material.
Further, according to screw thread process specifications parameter, the step of selected corresponding cutter comprises:
According to the size of thread angle, cut feed distance and the mapping relations of cutting the feed degree of depth in setting every layer, in determining every layer, cut feed distance.
Further, according to screw thread process specifications parameter, obtain chipping allowance to determine that the step of cutting feed distance comprises:
According to the nominal diameter of blind hole to be processed and the footpath, the end of blind hole to be processed, calculate chipping allowance;
According to the cutting feed degree of depth of chipping allowance and setting, determine to cut the number of plies;
Cut feed distance in setting every layer and cut the mapping relations of the feed degree of depth, and according to the size of thread angle with cut the number of plies, determine that every layer is cut feed distance.
Further, cut feed distance to be expressed as by formula with the mapping relations of cutting the feed degree of depth:
d*tan(α/2)＝L
n-1-L
n
Wherein, cutting feed degree of depth when d is every layer of cutting, n is the number of plies of cutting, L
n-1for last layer cuts feed distance, L
nfor current layer cuts feed distance, α is thread angle, and setting current layer cuts feed distance and cuts feed apart from little than last layer.
Further, according to cut feed distance use cutter to treat step that processing blind hole carries out screw thread process comprises:
The cutting feed distance degree determined according to cutting relation, successively treats processing blind hole and carries out screw thread process.
Further, use cutter to treat after processing blind hole carries out the step of screw thread process according to cutting feed distance to comprise:
According to the withdrawing angle threshold of setting in advance, withdrawing is carried out to cutter.
Further, according to cutting feed distance use cutter the step of screw thread process is carried out to described blind hole to be processed after comprise:
The withdrawing angle direction of cutter according to setting is in advance exited outside blind hole to be processed.
Further, also comprise cutter is exited the step outside blind hole to be processed according to the withdrawing angle direction of setting in advance after:
Receive one-stroke screw chasing instruction, implement to suspend to the cutter completing current layer screw thread process, and in the threshold time of setting, the iron filings treated in processing blind hole are cleaned out.
Further, use cutter to treat after processing blind hole carries out the step of screw thread process according to cutting feed distance to comprise:
According to cutting feed distance, until when chipping allowance is zero, then the screw thread process of blind hole to be processed is complete.
The present invention has following beneficial effect:
1, treat processing blind hole according to the cutting feed distance of setting and carry out screw thread process, the accuracy of thread of processing is high, and in process, the stability of thread quality improves greatly.
2, according to screw thread process specifications parameter, the selected cutter corresponding with screw thread process specifications parameter, cutting-tool's used life improves greatly, significantly reduces cutter use cost.
3, select the cutter corresponding with screw thread process specifications parameter and cut feed distance, improve working (machining) efficiency, decrease the number of times that operator changes cutter in process.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the present invention without female thread machining method first embodiment of escape blind hole;
Fig. 2 is the machining sketch chart of the present invention without the female thread machining method of escape blind hole;
Fig. 3 is the flow chart of the present invention without female thread machining method second embodiment of escape blind hole;
Fig. 4 is the flow chart of the present invention without female thread machining method the 3rd embodiment of escape blind hole; And
Fig. 5 is the flow chart of the present invention without female thread machining method the 4th embodiment of escape blind hole.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
With reference to Fig. 1, the preferred embodiments of the present invention provide a kind of female thread machining method without escape blind hole, comprise step:
Step S100, obtain the screw thread process specifications parameter of blind hole to be processed.
Digit Control Machine Tool obtains the screw thread process specification coefficient of the blind hole to be processed of artificial input by human-computer interaction interface, this screw thread process specifications parameter comprises the specification size of screw thread, thread material and thread angle etc.Wherein the specification size of screw thread comprises the nominal diameter of screw thread, tooth depth, pitch and reach.
Step S200, according to screw thread process specifications parameter, selected corresponding cutter and obtain chipping allowance to determine to cut feed distance.
Digit Control Machine Tool, according to the specification size of screw thread obtained, thread material and thread angle, selects adaptive cutter.Such as, the cutter identical with blind threaded angle of thread to be processed is selected.And according to screw thread process specifications parameter, obtain chipping allowance to determine to cut feed distance.Wherein, cut in feed distance and be provided with screw thread process start position and screw thread process final position, screw thread process start position is just positioned at the opening part of blind hole to be processed, and screw thread process final position is limited with footpath, the end end not exceeding blind hole to be processed.The metal layer thickness that chipping allowance cuts needed for blind hole to be processed, specifically can calculate according to the footpath, the end of the screw thread nominal diameter of blind hole to be processed and blind hole to be processed, the footpath, the end of the screw thread nominal diameter-blind hole to be processed of chipping allowance=blind hole to be processed.If when chipping allowance equals zero, then the interior volution completion of processing of blind hole to be processed is described.If when chipping allowance equals the interior volution tooth depth of blind hole to be processed, then can sentence identical cutting feed distance in the starting point of same turning and treat processing blind hole and carry out screw thread process after multilayer is cut.If when chipping allowance is greater than the internal thread tooth depth of blind hole to be processed, then cut based on feed distance by last layer, determine that current layer cuts feed distance.Particularly, according to the number of plies that every layer is cut the feed degree of depth and determines to process, each cutting feed degree of depth can be identical, also can be different, in this no limit.If when every layer of cutting feed degree of depth is identical, then the number of plies=chipping allowance ÷ every layer cuts the feed degree of depth.
Set the cutting relation mapped mutually with screw thread process specifications parameter, this cutting relation is used for determining that current layer cuts feed distance, wherein, blind hole internal thread to be processed adopts layered mode processing, and setting is cut the feed degree of depth accordingly and cut feed distance and meets this cutting relation.Particularly, as shown in Figure 2, this cutting relation is expressed as by formula:
d*tan(α/2)＝L
n-1-L
n
Wherein, cutting feed degree of depth when d is every layer of cutting, n is the number of plies of cutting, L
n-1for last layer cuts feed distance, L
nfor current layer cuts feed distance, the cutting feed distance of ground floor is the reach of blind hole internal thread to be processed, α is thread angle, when cutting for every layer, setting current layer cuts feed distance and cuts feed apart from little than last layer, according to above-mentioned formula, the feed degree of depth and last layer cutting feed distance can be cut according to every layer, calculate current layer and cut feed distance.And cut feed distance according to the current layer calculated, make tool sharpening constant to thread termination place machining allowance, ensure that cutter can not be damaged, can ensure to be worked into the triangle that the destination county form of thread is α simultaneously.
Step S300, cutter is used to treat processing blind hole and carry out screw thread process according to cutting feed distance.
Digit Control Machine Tool cuts feed distance according to current layer, uses the cutter identical with blind threaded angle of thread to be processed, successively treats processing blind hole and carry out screw thread process.
The female thread machining method without escape blind hole that the present embodiment provides, obtains the screw thread process specifications parameter of blind hole to be processed; According to screw thread process specifications parameter, selected corresponding cutter and acquisition chipping allowance are to determine to cut feed distance; Wherein, the start position cutting feed distance is positioned at the opening part of blind hole to be processed; Use cutter to treat processing blind hole according to cutting feed distance and carry out screw thread process.Thus prevent the thread termination processed from making cutter tipping because chipping allowance increases, and the thread form ensureing thread termination place is the triangle of α.The accuracy of thread stability that is high, thread quality of the present embodiment processing improves greatly; Cutting-tool's used life improves greatly, significantly reduces cutter use cost; Improve working (machining) efficiency, decrease the number of times that operator changes cutter in process.
Further, as shown in Figure 3, Fig. 3 is the flow chart of the present invention without female thread machining method second embodiment of escape blind hole, on the basis of the first embodiment, comprises after step S300:
Step S400, according to the withdrawing angle threshold of in advance setting, withdrawing is carried out to cutter.
Digit Control Machine Tool carries out withdrawing according to the withdrawing angle threshold of setting in advance, and particularly, as shown in Figure 2, this withdrawing angle threshold setting range is: be greater than α and be less than 90 °, and in the 1st quadrant area, thus when effectively can avoid withdrawing, blade damages machining screw.
The female thread machining method without escape blind hole that the present embodiment provides, carries out withdrawing to cutter according to the withdrawing angle threshold of in advance setting, and when effectively can avoid withdrawing, blade damages machining screw.
Further, as shown in Figure 4, Fig. 4 is the flow chart of the present invention without female thread machining method the 3rd embodiment of escape blind hole, on the basis of the first embodiment, comprises after step S300:
Step S500, the withdrawing angle direction of cutter according in advance setting to be exited outside blind hole to be processed.
Digit Control Machine Tool is according to one-stroke screw chasing instruction (G32), and after the complete one deck of the every turning of cutter, exited outside described blind hole to be processed by the withdrawing angle direction of cutter by setting, the withdrawing angle direction set is negative Z-direction as edge.
Step S600, reception one-stroke screw chasing instruction, implement to suspend, and in the threshold time of setting, the iron filings treated in processing blind hole are cleaned out to the cutter completing current layer screw thread process.
Digit Control Machine Tool is implemented to suspend to the cutter completing current layer screw thread process, and use high pressure air rifle to be cleaned out by the iron filings in blind hole to be processed in the threshold time of setting, and check whether the point of a knife blade of cutter has damage, and if cutter is without damage, then start-up routine again.The time threshold of setting can adjust in real time according to the actual demand of user.
Further, as shown in Figure 5, Fig. 5 is the flow chart of the present invention without female thread machining method the 4th embodiment of escape blind hole, on the basis of the first embodiment, comprises after step S300:
Step S700, according to cutting feed distance, until when chipping allowance is zero, then the screw thread process of blind hole to be processed is complete.
Digit Control Machine Tool is according to cutting feed distance, and operate successively, until when chipping allowance is zero, then the screw thread process of blind hole to be processed is complete.
The female thread machining method without escape blind hole that the present embodiment provides, by cutting feed distance, until the screw thread process of blind hole to be processed is complete.Thus improve accuracy of screw machining, improve thread quality; Cutter life is provided, significantly reduces cutter use cost; Improve working (machining) efficiency.
Below with a concrete case study on implementation, the present invention is described in detail:
The processing specification of blind hole internal thread to be processed is:
Machining screw is M8 × 1, and the pitch diameter of thread is φ 7.35 (+0.095,0), and footpath, the end is φ 6.91 (+0.1,0), and the form of thread is triangle, and angle of thread is 60 °, and reach L=10mm, without escape.
1,60 ° of forming threading tools are selected.
2, in the present embodiment, the first programming method or the second programming method establishment screw thread process numerical control program can be adopted.
One, the first programming method
Diametric chipping allowance is 8mm-6.91mm=1.09mm, in a program, if cutting feed degree of depth d when cutting in setting every layer is equal, and d=0.109mm, then the number of plies of turning is n=10, the relation according to Ln exists with cutting feed degree of depth d:
d*tan(α/2)＝L
n-1-L
n
Ground floor cutted thread distance L
1=10mm,
So, second layer turning distance is L
2=L
1-0.109*tan30 °=10mm-0.0629mm=9.9371mm,
…….
So, Floor 12 turning distance L
12=L
11-0.109*tan30 °=9.434mm.
Two, the second programming method
Certainly, cutting feed degree of depth d when cutting in each layer also can be set to not identical, such as, when first time cuts setting d
1=0.2, then according to the relation that Ln exists with cutting feed degree of depth d
d*tan(α/2)＝L
n-1-L
n
Ground floor cutted thread distance L
1=10mm,
So, second layer turning distance is L
2=L
1-0.2*tan30 °=10mm-0.1156mm=9.8844mm,
Setting d when second time is cut
2=0.1mm,
So, third layer turning distance is L
3=L
2-0.1*tan30 °=9.8844mm-0.0578mm=9.8266mm
…….
3, withdrawing
The direction setting scope of cutter withdrawing is: be greater than 60 ° and be less than in the 1st quadrant area of 90 °.
Select one-stroke screw chasing instruction G32 in program, after every one deck turning completes, increase pause instruction.
4, clear up
In screw thread process program, the complete one deck of the every turning of cutter, cutter moves back outside blind hole to be processed in the axial direction, simultaneously Digit Control Machine Tool suspends, and uses high pressure air rifle to be cleaned out by the iron filings in blind hole, needs to check tool nose simultaneously, whether blade have damage, if cutter is without damage, restart program, repeat, until screw thread process completes.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. without a female thread machining method for escape blind hole, it is characterized in that, comprise step:
Obtain the screw thread process specifications parameter of blind hole to be processed;
According to described screw thread process specifications parameter, selected corresponding cutter and acquisition chipping allowance are to determine to cut feed distance; Wherein, the start position of described cutting feed distance is positioned at the opening part of blind hole to be processed;
Described cutter is used to carry out screw thread process to described blind hole to be processed according to described cutting feed distance.
2. the female thread machining method without escape blind hole according to claim 1, is characterized in that,
Described screw thread process specifications parameter comprises the specification size of screw thread, thread material and thread angle.
3. the female thread machining method without escape blind hole according to claim 2, is characterized in that,
Described according to described screw thread process specifications parameter, the step of selected corresponding cutter comprises:
According to specification size and the thread material of screw thread, selected specification size with described screw thread and the suitable cutter of described thread material.
4. the female thread machining method without escape blind hole according to claim 2, is characterized in that,
Described according to described screw thread process specifications parameter, obtain chipping allowance to determine that the step of cutting feed distance comprises:
According to the nominal diameter of blind hole to be processed and the footpath, the end of blind hole to be processed, calculate chipping allowance;
According to the cutting feed degree of depth of described chipping allowance and setting, determine to cut the number of plies;
Cut feed distance in setting every layer and cut the mapping relations of the feed degree of depth, and according to the size of described thread angle and the described cutting number of plies, determine that every layer is cut feed distance.
5. the female thread machining method without escape blind hole according to claim 4, is characterized in that,
Described cutting feed distance is expressed as by formula with the mapping relations of cutting the feed degree of depth:
d*tan(α/2)＝L
n-1-L
n
Wherein, cutting feed degree of depth when d is every layer of cutting, n is the number of plies of cutting, L
n-1for last layer cuts feed distance, L
nfor current layer cuts feed distance, α is thread angle, and setting current layer cuts feed distance and cuts feed apart from little than last layer.
6. the female thread machining method without escape blind hole according to claim 5, is characterized in that,
Describedly described cutter is used to comprise the step that described blind hole to be processed carries out screw thread process according to described cutting feed distance:
According to the described cutting feed distance that described cutting relation is determined, successively screw thread process is carried out to described blind hole to be processed.
7. the female thread machining method without escape blind hole according to claim 6, is characterized in that,
Described according to described cutting feed distance use described cutter screw thread process step is carried out to described blind hole to be processed after comprise:
According to the withdrawing angle threshold of setting in advance, withdrawing is carried out to described cutter.
8. the female thread machining method without escape blind hole according to claim 6, is characterized in that,
Described according to described cutting feed distance use described cutter the step of screw thread process is carried out to described blind hole to be processed after comprise:
The withdrawing angle direction of described cutter according to setting is in advance exited outside described blind hole to be processed.
9. the female thread machining method without escape blind hole according to claim 8, is characterized in that,
Also comprise after the described step described cutter exited according to the withdrawing angle direction of setting in advance outside described blind hole to be processed:
Receive one-stroke screw chasing instruction, implement to suspend to the described cutter completing current layer screw thread process, and in the threshold time of setting, the iron filings in described blind hole to be processed are cleaned out.
10. the female thread machining method without escape blind hole according to claim 5, is characterized in that,
Described according to described cutting feed distance use described cutter the step of screw thread process is carried out to described blind hole to be processed after comprise:
According to described cutting feed distance, until when described chipping allowance is zero, then the screw thread process of blind hole to be processed is complete.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510888233.4A CN105345172B (en) | 2015-12-07 | 2015-12-07 | Female thread machining method without escape blind hole |
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|---|---|---|---|
| CN201510888233.4A CN105345172B (en) | 2015-12-07 | 2015-12-07 | Female thread machining method without escape blind hole |
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Cited By (4)
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| CN108672841A (en) * | 2018-06-06 | 2018-10-19 | 钱立民 | A method of utilizing slot knife turning tooth bottom screw thread |
| CN110125493A (en) * | 2019-06-20 | 2019-08-16 | 苏州市航宝科技技术有限公司 | A kind of elongated thread segmental machining method |
| CN111037008A (en) * | 2019-12-30 | 2020-04-21 | 西安昆仑工业（集团）有限责任公司 | Method for manufacturing fixed-start-point rectangular internal thread |
| CN112756712A (en) * | 2019-10-21 | 2021-05-07 | 贵州捷盛钻具股份有限公司 | Method for machining tool withdrawal groove-free blind hole wave-shaped threads by using numerical control lathe |
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| CN111037008B (en) * | 2019-12-30 | 2021-04-13 | 西安昆仑工业（集团）有限责任公司 | Method for manufacturing fixed-start-point rectangular internal thread |
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Address after: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee after: China Hangfa South Industrial Co. Ltd. Address before: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee before: China Southern Airlines Industry (Group) Co., Ltd. |
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