CN2925715Y - Extruded tap of machining connecting-rod threaded hole - Google Patents
Extruded tap of machining connecting-rod threaded hole Download PDFInfo
- Publication number
- CN2925715Y CN2925715Y CN 200620086463 CN200620086463U CN2925715Y CN 2925715 Y CN2925715 Y CN 2925715Y CN 200620086463 CN200620086463 CN 200620086463 CN 200620086463 U CN200620086463 U CN 200620086463U CN 2925715 Y CN2925715 Y CN 2925715Y
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- China
- Prior art keywords
- thread
- tap
- rod body
- screwed hole
- screwthread
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model discloses an extruded tap for machine the connecting rod body bolt hole, consists of a taper guide part in the front end of the taper, an extruded screwthread modeling part connected with the taper guiding part and the shank part connected with the screwthread modeling part. A guide part of keeping the tap extrusion direction is fixing equipped on the shank part; the setting of the taper guiding part and guide part ensure the accuracy of the shape and position of the machining connecting rod body bolt; when the extruded tap is making extrusion machining, the metal material is in leastic and plastic distortion state, the extending value of the bolt hole is quite small, the inner screwthread with high precision is got; through the extrusion, the roughness of the screwthread is low, and the size steady is better; when making the extrusion, the crystal inside the metal is slipping, and forms a chilled layer with orderly increasing chill degree from the tooth form top to the bottom, and improves the tensile strength of the screwthread.
Description
Technical field
The utility model relates to the special screw tap in the gonnecting rod body hole processing process.
Background technology
As shown in Figure 4, steyr diesel engine connecting bar body and connecting rod cap are to be screwed into two bolts hole on the gonnecting rod body by two connecting-rod bolts, and the structure of two bolts hole and connects in the mode that screw thread is tightened respectively as shown in Figure 5 and Figure 6.When the toggle working motion, the screw thread profile in bolt and connecting-rod bolts hole produces the fine motion pultrusion, is in the fretting wear state.Therefore, have relatively high expectations in the connecting-rod bolts hole not only accuracy of form and position, require the screw-type mask that wear resistence is arranged simultaneously, the ridge body, with the tensile strength that should possess to a certain degree that is connected of matrix, prevent initial failure, as screw-type facial cleft line, the ridge body twists, comes off etc., will cause the connecting rod cracking of high-speed motion in case lose efficacy, diesel engine is scrapped.
The internal thread that common cut tap processes, metallic fiber is cut off, and does not possess high tensile strength, shearing strength, obviously is not suitable for processing the connecting-rod bolts hole.Therefore, develop and a kind ofly be fit to add the thread forming tap that body of tool material, the accuracy of form and position required, can carry defined torque link bolt hole, and realize the processing in this hole with the appropriate process process, meaning is non-shallow.
Summary of the invention
It is continuous that technical problem to be solved in the utility model provides a kind of metallic fiber, and tension, shearing strength are higher, and the surface roughness of processing is also processed the thread forming tap of connecting rod screwed hole preferably.
For achieving the above object, the technical solution of the utility model is: the thread forming tap of processing gonnecting rod body screwed hole, comprise the taper guidance part that is positioned at the cone front end, the thread-rolling screw forming section that is connected with the taper guidance part, the handle of a knife portion that is connected with screw forming portion, be installed with in the described handle of a knife portion and keep screw tap to squeeze the guide part of silk direction.
As a kind of improvement, the length of described thread-rolling screw forming section is 15mm-22mm, and the pitch of extruding sword is 1.5mm, and the big footpath of extruding sword is φ 14.1mm-φ 14.3mm, the middle footpath of extruding sword is φ 13.1mm-φ 13.3mm, and the path of extruding sword is φ 12.3mm-φ 12.5mm.
As further improvement, the cross section of described thread-rolling screw forming section is a square, and the edges and corners of described square are arc transition.
As further improvement, the heat treated case hardness of described thread-rolling screw forming section is HRC63-66, and the case hardness of thread forming tap remainder is HRC32-48.
As further improvement, the outer surface of described thread-rolling screw forming section is coated with the BN-SiN ceramic thin sheet.
As further improvement, the diameter of described guide part is φ 14.85mm-φ 14.98mm, and the distance between the front end of the front end of guide part and thread-rolling screw forming section is 25mm-44mm.
Owing to adopt technique scheme, the thread forming tap of processing connecting rod screwed hole, comprise the taper guidance part that is positioned at the cone front end, the thread-rolling screw forming section that is connected with the taper guidance part, the handle of a knife portion that is connected with screw forming portion, be installed with in the described handle of a knife portion and keep screw tap to squeeze the guide part of silk direction; Setting up of taper guidance part and guide part guaranteed the shape of institute's processing gonnecting rod body screw thread and the accuracy of position; Thread forming tap is when extrusion process, and metal material is in elasticity and the state of plastic deformation, and the expansion amount of screw is minimum, can obtain the very high internal thread of precision, and by squeezing silk, the thread surface roughness is lower, and size stability is better; During extruding, the grain sliding of metal inside has formed the chilling layer that chill degree increases gradually from the tooth form top to the bottom, has improved the tensile strength of screw thread.
The outer surface of described thread-rolling screw forming section is coated with the BN-SiN ceramic thin sheet, has improved the case hardness of thread forming tap, thereby has improved the service life of thread forming tap.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment thread forming tap;
Fig. 2 be among Fig. 1 C-C to cutaway view;
Fig. 3 is the cutaway view of the utility model embodiment thread-rolling screw forming section axial cross section;
Fig. 4 is the structural representation of the utility model embodiment background technology;
Fig. 5 be among Fig. 4 A-A to cutaway view;
Fig. 6 be among Fig. 4 B-B to cutaway view.
The specific embodiment
The steyr diesel engine is the engine of China from Austria's introduction, has many enterprises to produce at home.Introduce two during the last ten years, because its excellent power performance has been subjected to user's welcome.Along with the continuous increase of development of technology and output, the production technology of introduction not too has been fit to existing production and specification requirement, and the raising of steyr diesel engine performance is caused bottleneck.Wherein the crudy of steyr diesel engine connecting bar body screwed hole is especially need be improved in the diesel engine production technology.
Theoretically, adopt thread forming tap to carry out screw thread processing and can improve the reliability of connecting rod and the service life of complete machine.But traditional thread forming tap generally is used to be processed with non-ferrous metal, because non-ferrous metal hardness is lower, this method more easily realizes; But adopt the gonnecting rod body of structural alloy steel through excellent suitability for press forming, its hardness is higher, how will squeeze the processing that a method is applied to the gonnecting rod body screw thread, becomes a big technical barrier.
Through us years of researches and test, invented the dedicated extruded screw tap that can be applicable to the structural alloy steel gonnecting rod body.
As shown in Figure 1, the thread forming tap of processing gonnecting rod body screwed hole, described thread forming tap comprises the taper guidance part 1 that is positioned at the cone front end, the thread-rolling screw forming section 2 that is connected with the taper guidance part, the handle of a knife portion 3 that is connected with screw forming portion, is installed with in the described handle of a knife portion to keep screw tap to squeeze the guide part 4 of silk direction.
As shown in Figure 3, the length of described thread-rolling screw forming section 2 is 15mm-22mm, and the pitch of extruding sword is 1.5mm, and the big footpath of extruding sword is φ 14.1mm-φ 14.3mm, the middle footpath of extruding sword is φ 13.1mm-φ 13.3mm, and the path of extruding sword is φ 12.3mm-φ 12.5mm.
As shown in Figure 2, the cross section of described thread-rolling screw forming section 2 is a square, and the edges and corners of described square are arc transition.Have four extruding swords on the same cross section of present embodiment, extruding force is balance comparatively, and the manufacture craft of thread forming tap is also comparatively simple.
The heat treated case hardness of described thread-rolling screw forming section 2 is HRC63-66, and the case hardness of thread forming tap remainder is HRC32-48.
The outer surface of described thread-rolling screw forming section 2 is coated with the BN-SiN ceramic thin sheet, with the case hardness of raising thread-rolling screw forming section 2, and then the service life of improving thread forming tap.
The diameter of described guide part 4 is φ 14.9mm, distance between the front end of the front end of guide part 4 and thread-rolling screw forming section 2 is 30mm, this structure can use the bolt hole on the connecting rod cap to position, and has satisfied the installation positioning requirements of gonnecting rod body and connecting rod cap fully.
Present embodiment only is to give an example to of the present utility model, wherein as the technical parameter of shape facility, is not unique, and the scope of its parameter is as the criterion with the content of claim.Any by the selection of the technical characterictic that claim of the present utility model covered, the flesh and blood protected of the utility model just.
Claims (6)
1. process the thread forming tap of gonnecting rod body screwed hole, it is characterized in that: described thread forming tap comprises the taper guidance part (1) that is positioned at the cone front end, the thread-rolling screw forming section (2) that is connected with the taper guidance part, the handle of a knife portion (3) that is connected with screw forming portion, is installed with in the described handle of a knife portion to keep screw tap to squeeze the guide part (4) of silk direction.
2. the thread forming tap of processing gonnecting rod body screwed hole as claimed in claim 1, it is characterized in that: the length of described thread-rolling screw forming section (2) is 15mm-22mm, the pitch of extruding sword is 1.5mm, the big footpath of extruding sword is φ 14.1mm-φ 14.3mm, the middle footpath of extruding sword is φ 13.1mm-φ 13.3mm, and the path of extruding sword is φ 12.3mm-φ 12.5mm.
3. the thread forming tap of processing gonnecting rod body screwed hole as claimed in claim 2 is characterized in that: the cross section of described thread-rolling screw forming section (2) is a square, and the edges and corners of described square are arc transition.
4. the thread forming tap of processing connecting rod screwed hole as claimed in claim 2 is characterized in that: the heat treated case hardness of described thread-rolling screw forming section (2) is HRC63-66, and the case hardness of thread forming tap remainder is HRC32-48.
5. as the thread forming tap of the described processing gonnecting rod body of the arbitrary claim of claim 1-4 screwed hole, it is characterized in that: the outer surface of described thread-rolling screw forming section (2) is coated with the BN-SiN ceramic thin sheet.
6. the thread forming tap of processing gonnecting rod body screwed hole as claimed in claim 5, it is characterized in that: the diameter of described guide part (4) is φ 14.85mm-φ 14.98mm, and the distance between the front end of the front end of guide part (4) and thread-rolling screw forming section (2) is 25mm-44mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620086463 CN2925715Y (en) | 2006-07-05 | 2006-07-05 | Extruded tap of machining connecting-rod threaded hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620086463 CN2925715Y (en) | 2006-07-05 | 2006-07-05 | Extruded tap of machining connecting-rod threaded hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2925715Y true CN2925715Y (en) | 2007-07-25 |
Family
ID=38279949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620086463 Expired - Fee Related CN2925715Y (en) | 2006-07-05 | 2006-07-05 | Extruded tap of machining connecting-rod threaded hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2925715Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102145418A (en) * | 2010-01-22 | 2011-08-10 | 株式会社田野井制作所 | Extruding tap for thin wall |
| CN103008703A (en) * | 2012-12-03 | 2013-04-03 | 西安航天发动机厂 | Special forming tool for deep hole double-sealing toothed valve seat |
| CN103846508A (en) * | 2012-12-01 | 2014-06-11 | 中国航空工业标准件制造有限责任公司 | Composite type screw tapper for threading machine |
| CN104227151A (en) * | 2013-06-19 | 2014-12-24 | 许灵生 | Tapping knife |
| CN106513874A (en) * | 2015-09-15 | 2017-03-22 | 许灵生 | Screw tap |
-
2006
- 2006-07-05 CN CN 200620086463 patent/CN2925715Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102145418A (en) * | 2010-01-22 | 2011-08-10 | 株式会社田野井制作所 | Extruding tap for thin wall |
| CN103846508A (en) * | 2012-12-01 | 2014-06-11 | 中国航空工业标准件制造有限责任公司 | Composite type screw tapper for threading machine |
| CN103008703A (en) * | 2012-12-03 | 2013-04-03 | 西安航天发动机厂 | Special forming tool for deep hole double-sealing toothed valve seat |
| CN104227151A (en) * | 2013-06-19 | 2014-12-24 | 许灵生 | Tapping knife |
| CN106513874A (en) * | 2015-09-15 | 2017-03-22 | 许灵生 | Screw tap |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070725 Termination date: 20150705 |
|
| EXPY | Termination of patent right or utility model |