CN200981164Y - Machine tool guide screw stretching device - Google Patents
Machine tool guide screw stretching device Download PDFInfo
- Publication number
- CN200981164Y CN200981164Y CN 200620076869 CN200620076869U CN200981164Y CN 200981164 Y CN200981164 Y CN 200981164Y CN 200620076869 CN200620076869 CN 200620076869 CN 200620076869 U CN200620076869 U CN 200620076869U CN 200981164 Y CN200981164 Y CN 200981164Y
- Authority
- CN
- China
- Prior art keywords
- screw mandrel
- saddle
- lead screw
- shaft coupling
- pad
- Prior art date
- 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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- Automatic Control Of Machine Tools (AREA)
Abstract
The utility model relates to a stretching device for a lead screw, solving the problem of that the lead screw arches when outstretching by heating which influences the machine accuracy, characterized in that one end of the lead screw is connected with a motor through a coupler, the other end of the lead screw is installed in a bearing seat which is connected with a saddle, a coupler seat of the coupler is connected with the saddle, the end face which connects the coupler seat and the saddle is perpendicular to the axial direction of the lead screw, and a pad is equipped in the connecting point between the coupler seat and the saddle. By installing the pad in the connecting point between the coupler seat and the saddle and pre-stretching the lead screw, the lead screw produces an inner stress, when heating the lead screw, thermal expansive force won't make the lead screw outstretch due to the existence of the inner stress, thereby the length of the lead screw won't change any more, and ensuring the positioning accuracy of the machine.
Description
Technical field
The utility model relates to the screw mandrel on the lathe, specifically, is the stretching device of screw mandrel.
Technical background
On lathe, an end of screw mandrel links to each other with motor by shaft coupling, and in the bearing block that the other end of screw mandrel is installed in saddle links to each other, the shaft coupling seat of described shaft coupling is connected on the saddle.The feed screw nut who matches with screw mandrel is fixed on the workbench.
During work, the motor direct-drive screw mandrel rotates, and drives the motion that workbench is done horizontal direction by the feed screw nut on the screw mandrel, thereby realizes the feeding of lathe along X-direction.
Because the screw mandrel two ends all are fixed bearings, when work, screw mandrel is subjected to thermal stretching, and screw mandrel can't extend to two ends, the screw mandrel phenomenon that arches upward then can occur, thereby make the helical pitch of screw mandrel error occur, has influenced the positioning accuracy of lathe.
Summary of the invention
The utility model solves, and to be exactly screw mandrel because of temperature rise extend to occur arching upward influences the problem of machine tool accuracy.
Lathe screw mandrel stretching device described in the utility model, one end of screw mandrel links to each other with motor by shaft coupling, in the bearing block that the other end of screw mandrel is installed in saddle links to each other, the shaft coupling seat of described shaft coupling is connected on the saddle, the end face that shaft coupling seat and saddle join is axial perpendicular to screw mandrel, in the joint of shaft coupling seat and saddle pad is set.
In installation process, pad is set by joint at shaft coupling seat and saddle, screw mandrel is carried out prestretched, thereby make screw mandrel produce internal stress, when screw mandrel is heated temperature rise, thermal expansion force can can't make screw mandrel extend because of the existence of internal stress, thereby the length of screw mandrel no longer changes, and the positioning accuracy of lathe is guaranteed.The utility model is by screw mandrel being imposed certain pretension, reduces the screw mandrel lead error that produces because of temperature rise, thereby improves the positioning accuracy of lathe.
As improvement, the thickness of described pad is S+ Δ S, and wherein S is the definite value that the conventional design personnel calculate according to machine tool structure, its increment size Δ S=(ρ * Δ T * L), wherein: ρ is the screw mandrel thermal coefficient of expansion, the temperature rise value of screw mandrel when Δ T is lathe work, and L is the screw mandrel length overall.
Why the thickness S of pad will add an increment size Δ S=(ρ * Δ T * L); Be because screw mandrel is Δ L=ρ * Δ T * L because of the elongation that temperature rise produces.In order to reduce the influence of elongation to screw mandrel, in installation process, screw mandrel is carried out the prestretched of Δ L by the thickness of adjusting pad, and the adjustment amount of spacer thickness is Δ S (Δ S=Δ L), screw mandrel after the prestretched its length when temperature rise occurring no longer changes, and the positioning accuracy of lathe is higher.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the partial enlarged drawing among Fig. 2.
The specific embodiment
Fig. 1,2 is depicted as the installation diagram of workbench saddle, one end of screw mandrel 5 links to each other with motor 1 by shaft coupling 3, the other end of screw mandrel 5 is installed in the bearing block 9 that links to each other with saddle 7, the shaft coupling seat 4 of described shaft coupling 3 is connected on the saddle 7, the end face that shaft coupling seat 4 and saddle 7 join is axial perpendicular to screw mandrel 5, in the joint of shaft coupling seat 4 and saddle 7 pad 2 is set.Be fixed on the workbench 6 with screw mandrel 5 fit screw rod nuts 8.The thickness of described pad is S+ Δ S, and wherein S is the definite value that the conventional design personnel calculate according to machine tool structure; Δ S=(ρ * Δ T * L), wherein: ρ is the screw mandrel thermal coefficient of expansion, the temperature rise value of screw mandrel when Δ T is lathe work, and L is the screw mandrel length overall.
When mounted screw mandrel is carried out prestretched, process is as follows: respectively add a pad 2 on installed surface between shaft coupling seat 4 and the saddle 7, aim at screw mandrel 5 axle heads with the dial gauge contact, thickness by continuous adjustment pad 2, finally read the desired value that screw mandrel 5 is stretched on dial gauge, this value is Δ L=ρ * Δ T * L, and wherein: ρ is the screw mandrel thermal coefficient of expansion, the temperature rise value of screw mandrel when Δ T is lathe work, L is the screw mandrel length overall.
For example, during temperature rise value＜5 of lathe when work screw mandrel ℃, generally getting Δ T is 3 ℃, and screw mandrel length overall L is 2000mm, and screw mandrel thermal coefficient of expansion ρ is 0.0000116/ ℃, then the thickness increment size Δ S=0.0000116 * 3 * 2000=0.0696mm of pad 2.
Claims (2)
1. lathe screw mandrel stretching device, one end of screw mandrel links to each other with motor by shaft coupling, in the bearing block that the other end of screw mandrel is installed in saddle links to each other, the shaft coupling seat of described shaft coupling is connected on the saddle, it is characterized in that: the end face that shaft coupling seat and saddle join is axial perpendicular to screw mandrel, in the joint of shaft coupling seat and saddle pad is set.
2. lathe screw mandrel stretching device according to claim 1 is characterized in that: the thickness of described pad is S+ Δ S, and wherein S decides according to machine tool structure, Δ S=(ρ * Δ T * L), wherein: ρ is the screw mandrel thermal coefficient of expansion, the temperature rise value of screw mandrel when Δ T is lathe work, and L is the screw mandrel length overall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620076869 CN200981164Y (en) | 2006-08-22 | 2006-08-22 | Machine tool guide screw stretching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620076869 CN200981164Y (en) | 2006-08-22 | 2006-08-22 | Machine tool guide screw stretching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200981164Y true CN200981164Y (en) | 2007-11-28 |
Family
ID=38908328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620076869 Expired - Fee Related CN200981164Y (en) | 2006-08-22 | 2006-08-22 | Machine tool guide screw stretching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200981164Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817153A (en) * | 2010-04-26 | 2010-09-01 | 济南二机床集团有限公司 | Ram type milling head feeding mechanism |
| CN102554638A (en) * | 2010-12-31 | 2012-07-11 | 富泰华工业（深圳）有限公司 | Positioning cabinet |
| CN105032960A (en) * | 2015-07-30 | 2015-11-11 | 南通科技投资集团股份有限公司 | Screw rod stretching device |
| CN105817940A (en) * | 2016-05-24 | 2016-08-03 | 深圳市创世纪机械有限公司 | Transmission assembly and numerical control machine tool |
| CN112025379A (en) * | 2020-07-27 | 2020-12-04 | 珠海格力电器股份有限公司 | Screw rod pre-stretching adjusting structure and method and numerical control machine tool |
| CN112846827A (en) * | 2020-12-25 | 2021-05-28 | 津上精密机床（浙江）有限公司 | Machine tool for small workpieces and method for improving precision of machine tool |
-
2006
- 2006-08-22 CN CN 200620076869 patent/CN200981164Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817153A (en) * | 2010-04-26 | 2010-09-01 | 济南二机床集团有限公司 | Ram type milling head feeding mechanism |
| CN102554638A (en) * | 2010-12-31 | 2012-07-11 | 富泰华工业（深圳）有限公司 | Positioning cabinet |
| CN102554638B (en) * | 2010-12-31 | 2016-06-29 | 富泰华工业（深圳）有限公司 | Positioning machine table |
| CN105032960A (en) * | 2015-07-30 | 2015-11-11 | 南通科技投资集团股份有限公司 | Screw rod stretching device |
| CN105817940A (en) * | 2016-05-24 | 2016-08-03 | 深圳市创世纪机械有限公司 | Transmission assembly and numerical control machine tool |
| CN112025379A (en) * | 2020-07-27 | 2020-12-04 | 珠海格力电器股份有限公司 | Screw rod pre-stretching adjusting structure and method and numerical control machine tool |
| CN112846827A (en) * | 2020-12-25 | 2021-05-28 | 津上精密机床（浙江）有限公司 | Machine tool for small workpieces and method for improving precision of machine tool |
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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: 20071128 Termination date: 20140822 |
|
| EXPY | Termination of patent right or utility model |