TWI411733B - Structure for conciliating hot deformation of a rolling screw - Google Patents
Structure for conciliating hot deformation of a rolling screw Download PDFInfo
- Publication number
- TWI411733B TWI411733B TW99147154A TW99147154A TWI411733B TW I411733 B TWI411733 B TW I411733B TW 99147154 A TW99147154 A TW 99147154A TW 99147154 A TW99147154 A TW 99147154A TW I411733 B TWI411733 B TW I411733B
- Authority
- TW
- Taiwan
- Prior art keywords
- tensioned
- fixed
- actuator
- bearing
- rolling
- Prior art date
Links
Landscapes
- Transmission Devices (AREA)
- Rolling Contact Bearings (AREA)
- Support Of The Bearing (AREA)
Abstract
Description
本發明係與滾動螺桿有關，特別是指一種使用滾動螺桿傳遞動力之熱變形調和結構。The present invention relates to a rolling screw, and more particularly to a thermal deformation coupling structure that uses a rolling screw to transmit power.
按滾動螺桿包含滾珠螺桿及滾柱螺桿，滾珠螺桿以滾珠來傳遞動力，而滾柱螺桿則以滾柱來傳遞動力；兩者都已被應用於各種高精度的機台上。隨著機台的精度需求愈高，滾動螺桿的各項精度要求也愈高，然而，由於滾動螺桿於運轉作業後，其螺桿軸會因發熱而使溫度上昇，因而產生熱變形之現象，而螺桿軸因為溫度改變所導致的熱變形即會導致機台定位上的漂移(俗稱為機台熱變位)，而使機台的定位精度不佳。The rolling screw includes a ball screw and a roller screw. The ball screw transmits power by balls, and the roller screw transmits power by rollers. Both have been applied to various high-precision machines. With the higher precision requirements of the machine, the precision requirements of the rolling screw are higher. However, since the rolling screw is heated after the rolling screw, the temperature rises due to heat generation, and thus thermal deformation occurs. The thermal deformation caused by the temperature change of the screw shaft will cause the drift of the positioning of the machine (commonly known as the thermal displacement of the machine), and the positioning accuracy of the machine is not good.
為減少螺桿軸溫度的改變所導致的熱變形對機台所造成的影響，目前的因應方法有以下三種方式：In order to reduce the impact of thermal deformation caused by the change of screw shaft temperature on the machine, the current method of response has the following three methods:
其一是預先熱機。在機台每天運作量產前，先快速空運轉一段時間(稱為熱機)後再進行運作量產，如此可以預先使螺桿軸的溫度上昇，在後續的使用中，螺桿軸溫度的再改變量就會比較少，以減少(或避免)加工過程中螺桿軸持續溫度上昇而產生熱變形的持續變化，使被加工之工件的尺寸誤差減少。但是，空運轉是耗時耗電而且不環保的，特別是因為滾動螺桿的摩擦係數很小，在滾動螺帽不受外力下，螺桿軸的溫度上昇的速度不快，而螺桿軸要達到穩定溫度所需的時間很長，因此，此方式特別耗時耗電，並不經濟。One is the pre-heating machine. Before the machine is in operation for mass production every day, it is necessary to run the mass production for a period of time (called a heat engine), so that the temperature of the screw shaft can be raised in advance, and the screw shaft temperature can be changed again in subsequent use. It will be less, in order to reduce (or avoid) the continuous change of the thermal deformation of the screw shaft during the machining process, and reduce the dimensional error of the workpiece to be processed. However, the idling operation is time consuming and environmentally unfriendly, especially because the friction coefficient of the rolling screw is small. When the rolling nut is not subjected to external force, the temperature of the screw shaft rises not fast, and the screw shaft reaches a stable temperature. The time required is very long, so this method is particularly time consuming and power consuming and uneconomical.
其二是使用光學尺或磁性尺來補正。由於光學尺或磁性尺的成本較高，且當機台的行程較長時，光學尺或磁性尺的製造困難度劇增，使光學尺或磁性尺的成本隨機台長度以指數式的增加，因此，此方式會造成大型機台的製造成本過高。The second is to use an optical ruler or a magnetic ruler to correct. Since the cost of the optical ruler or the magnetic ruler is high, and when the stroke of the machine is long, the manufacturing difficulty of the optical ruler or the magnetic ruler is greatly increased, and the cost of the optical ruler or the magnetic ruler is increased exponentially. Therefore, this method will cause the manufacturing cost of the main machine to be too high.
其三是對螺桿軸預先加予一個預拉力的設計。此方法雖然有減少熱變形影響機台精度的效果，但是目前的設計並不完善，在初始加工的過程中，螺桿軸隨著溫度的上升仍會持續有熱變形產生，並且機台的定位仍會持續不斷的漂移，在開機後的半小時甚至一小時間內，工件雖比不預拉且不熱機的情形穩定，但尺寸仍會不斷的變化。目前的預拉方式只能減少螺桿軸熱變形對機台影響，並不能完全或幾近完全消除螺桿軸的熱變形影響。除此之外，參閱第1圖為一滾動螺桿預拉方式示意圖，其中該螺桿軸11的固定端部111係樞設於固定軸承座12，該螺桿軸11的預拉端部112係樞設於該預拉軸承座13上，定義該螺桿軸11的螺旋部113兩端點為A與B，而在預拉的過程中，床台14上的預拉軸承座13以及固定軸承座12都會微量地向中間彎曲變形(在此故意誇示此變形量，以容易了解)。並且，為了降低成本，該預拉軸承座13以及固定軸承座12皆朝向體積小型化設計，此造成各該軸承座的剛性愈來愈差，使得預拉後該預拉軸承座13以及固定軸承座12的變形問題也會愈來愈嚴重。The third is to pre-apply a pre-tension on the screw shaft. Although this method has the effect of reducing the thermal deformation affecting the precision of the machine, the current design is not perfect. During the initial machining process, the screw shaft will continue to have thermal deformation with the rise of temperature, and the positioning of the machine still remains. It will continue to drift. In the half hour or even a short time after starting the machine, although the workpiece is stable than if it were not pre-tensioned and not hot, the size will continue to change. The current pre-tensioning method can only reduce the influence of the hot deformation of the screw shaft on the machine table, and can not completely or completely eliminate the thermal deformation effect of the screw shaft. In addition, referring to FIG. 1 is a schematic view of a rolling screw pre-drawing manner, wherein the fixed end portion 111 of the screw shaft 11 is pivotally disposed on the fixed bearing housing 12, and the pre-tensioned end portion 112 of the screw shaft 11 is pivoted. On the pre-tension bearing block 13, the ends of the spiral portion 113 defining the screw shaft 11 are defined as A and B, and during the pre-tensioning process, the pre-tensioned bearing seat 13 on the bed 14 and the fixed bearing housing 12 are It is slightly deformed to the middle (the amount of deformation is deliberately exaggerated here for easy understanding). Moreover, in order to reduce the cost, the pre-tensioned bearing housing 13 and the fixed bearing housing 12 are all designed toward a small size, which causes the rigidity of each of the bearing housings to become worse and worse, so that the pre-tensioned bearing housing 13 and the fixed bearing are pre-tensioned. The deformation problem of the seat 12 will also become more and more serious.
由於預拉軸承座13以及固定軸承座12的變形量將隨著預拉力的大小而改變，因此，第1圖中的A點的位置將隨預拉力的變化而改變(因為預拉力不同，則固定軸承座12的彎曲量不同)；當機台開機後，該螺桿軸11開始運轉而使溫度慢慢上昇，預拉力也會慢慢下降，而A點及B點也會持續不斷的移動(在溫昇的過程中螺旋部113膨脹，預拉力量逐漸減少，因而A點逐漸向右移，B點逐漸向左移)。是以，此傳統的預拉方式，該床台14上的預拉軸承座13以及固定軸承座12會有變形問題，即造成該螺桿軸11的螺旋部113兩端產生左右方向的漂移，導致該螺桿軸11溫昇時機台的熱變位而影響機台運作時的定位精度。Since the amount of deformation of the pre-tensioned bearing housing 13 and the fixed bearing housing 12 will vary with the magnitude of the pre-tensioning force, the position of point A in Fig. 1 will change as the pre-tensioning force changes (because the pre-tensioning force is different, The bending amount of the fixed bearing seat 12 is different); when the machine is turned on, the screw shaft 11 starts to operate, the temperature is gradually increased, the pre-tension is gradually decreased, and the points A and B are continuously moved ( During the temperature rise process, the spiral portion 113 expands, and the pre-tensioning force gradually decreases, so that the point A gradually shifts to the right, and the point B gradually shifts to the left. Therefore, in the conventional pre-tensioning method, the pre-tensioned bearing seat 13 and the fixed bearing housing 12 on the bed 14 have a deformation problem, that is, the left and right directions of the spiral portion 113 of the screw shaft 11 are caused to drift. When the screw shaft 11 rises, the thermal displacement of the machine table affects the positioning accuracy of the machine when the machine is in operation.
因此滾動螺桿的熱變形問題目前仍是機械領域的重要問題之一，實有加以再研究改善及精進的需要。Therefore, the problem of thermal deformation of the rolling screw is still one of the important problems in the mechanical field, and there is a need to study and improve and improve.
本發明的目的在於提供一種滾動螺桿的熱變形調和結構，其主要係為了減少該螺桿軸在溫度上昇時其螺旋部因為溫度改變而變形的問題，避免機台運作時，因為熱變位而使機台定位精度不佳。The object of the present invention is to provide a thermal deformation adjustment structure of a rolling screw, which is mainly for reducing the problem that the screw shaft is deformed due to temperature change when the temperature of the screw shaft rises, and avoids the heat displacement due to the operation of the machine. The positioning accuracy of the machine is not good.
緣是，為了達成前述之目的，本發明所提供之一種熱變形調和結構，包含：一螺桿軸，其上具有一螺旋部，該螺旋部之兩端分別接續一固定端部及一預拉端部；一滾動螺帽，係螺合於該螺旋部上；一床台，其上設有一固定軸承座與一預拉軸承座，該固定軸承座設有一固定軸承組，以供該固定端部樞設，該預拉軸承座也設有一預拉軸承組，以供該預拉端部樞設；而該預拉軸承座厚度小於該固定軸承座厚度，以使固定軸承座的彎曲量儘可能減少；一固定螺帽，係螺設於該固定端部，以限制該固定軸承組和固定端部間移動；一預拉螺帽，係螺設於該預拉端部，以限制該預拉軸承組和預拉端部間移動；一感測器，用以偵測變化；其變化可以是位置上的變化，或溫度的變化；一致動器，設於前述之預拉軸承座及預拉軸承組間，以調整前述之預拉軸承座及預拉軸承組間之距離；而致動器可以為一壓電致動器，可以用改變其輸入的電壓大小來控制其長度或厚度，且壓電致動器的體積小而剛性佳，可以承受較大的機械結構的負荷。In order to achieve the foregoing objective, the present invention provides a thermal deformation-adjusting structure comprising: a screw shaft having a spiral portion thereon, wherein the two ends of the spiral portion are respectively connected to a fixed end portion and a pre-tensioned end a rolling nut is screwed onto the spiral portion; a bed having a fixed bearing seat and a pre-tensioned bearing seat, the fixed bearing seat being provided with a fixed bearing set for the fixed end The pretensioned bearing block is also provided with a pre-tensioned bearing set for pivoting the pre-tensioned end portion; and the pre-tensioned bearing seat has a thickness smaller than the thickness of the fixed bearing seat, so that the bending amount of the fixed bearing seat is as a fixing nut is screwed on the fixed end portion to restrict movement between the fixed bearing set and the fixed end portion; a pre-tensioned nut is screwed on the pre-tensioned end portion to limit the pre-tensioning Moving between the bearing set and the pre-tensioned end; a sensor for detecting changes; the change may be a change in position, or a change in temperature; an actuator, provided in the aforementioned pre-tensioned bearing housing and pre-tensioned Between the bearing sets to adjust the aforementioned pre-tensioned bearing housing and pre-tensioning The distance between the groups; and the actuator can be a piezoelectric actuator, the length or thickness of which can be controlled by changing the voltage of its input, and the piezoelectric actuator is small in size and rigid, and can withstand The load of large mechanical structures.
其中，該螺旋部及預拉端部間可形成一預拉端面，且該感測器係偵測該預拉端面之位置或位移，以驅動該致動器作動。A pre-tensioned end surface is formed between the spiral portion and the pre-tensioned end portion, and the sensor detects the position or displacement of the pre-tensioned end surface to drive the actuator to actuate.
其中，該固定端部可區分為一固定圓柱段與一固定陽螺紋段，該固定圓柱段上係套設該固定軸承組而樞設於該固定軸承座，該固定陽螺紋段係供該固定螺帽螺設。The fixed end portion can be divided into a fixed cylindrical section and a fixed male threaded section. The fixed cylindrical section is sleeved on the fixed bearing set and pivoted on the fixed bearing seat, and the fixed male thread section is used for the fixing. Nut screw setting.
其中，該預拉端部可區分為一預拉圓柱段與一預拉陽螺紋段，該預拉圓柱段上係套設該預拉軸承組而樞設於該預拉軸承座上，該預拉陽螺紋段係供該預拉螺帽螺設。Wherein, the pre-tensioned end portion can be divided into a pre-tensioned cylindrical section and a pre-tensioned threaded section, and the pre-tensioned cylindrical section is sleeved on the pre-tensioned bearing set and pivoted on the pre-tensioned bearing seat, the pre-tensioning The pull-on screw section is provided for the pre-tensioned nut.
其中，該螺旋部可具有一滾動溝，且該滾動螺帽具有一與該滾動溝形成一負荷路徑的滾動槽，且於該負荷路徑內設有複數個滾動元件於其間循環滾動。滾動元件可以為滾珠或滾柱。The spiral portion may have a rolling groove, and the rolling nut has a rolling groove forming a load path with the rolling groove, and a plurality of rolling elements are cyclically rolled in the load path. The rolling elements can be balls or rollers.
其中，該感測器可設於該滾動螺帽上，該感測器可偵測該滾動螺帽之溫度，以驅動該致動器作動。The sensor can be disposed on the rolling nut, and the sensor can detect the temperature of the rolling nut to drive the actuator to act.
其中，該感測器可設於該固定軸承座上，該感測器可偵測該固定軸承座之溫度，以驅動該致動器作動。The sensor can be disposed on the fixed bearing housing, and the sensor can detect the temperature of the fixed bearing housing to drive the actuator to act.
其中，該感測器可設於該預拉軸承座上，該感測器可偵測該預拉軸承座之溫度，以驅動該致動器作動。Wherein, the sensor can be disposed on the pre-tensioned bearing housing, and the sensor can detect the temperature of the pre-tensioned bearing housing to drive the actuator to act.
有關本發明為達成上述目的，所採用之技術、手段及其他之功效，茲舉一較佳可行實施例並配合圖式詳細說明如後。The present invention has been described in connection with the preferred embodiments of the present invention in accordance with the accompanying drawings.
第2圖為本發明之一種熱變形調和結構的一實施例，該熱變形調和結構包含一螺桿軸20、一滾動螺帽31、一床台40、一固定螺帽71、一預拉螺帽72、一感測器74及一致動器60。2 is an embodiment of a thermal deformation blending structure of the present invention, the heat distortion blending structure comprising a screw shaft 20, a rolling nut 31, a bed 40, a fixing nut 71, and a pre-tensioned nut 72. A sensor 74 and an actuator 60.
其中，該螺桿軸20上具有一螺旋部21，該螺旋部21之兩端分別各接續一固定端部22及一預拉端部23；其中，該螺旋部21及預拉端部23的外徑可以設計成不同的尺寸，而通常可如第2圖所示將螺旋部21的外徑設計成大於預拉端部23的外徑，該螺旋部21及預拉端部23間因為外徑的差異而形成一預拉端面213；其中，該滾動螺帽31，係螺合於該螺旋部21，用以傳遞動力；其中，該床台40，其上設有一固定軸承座41與一預拉軸承座42，該固定軸承座41設有一固定軸承組33，以供該固定端部22樞設，該預拉軸承座42設有一預拉軸承組34，以供該預拉端部23樞設；而為了使固定軸承座41的變形量小於該預拉軸承座42的變形量，該預拉軸承座厚度W2可以設計為小於該固定軸承座厚度W1，以使固定軸承座41的彎曲變形量較少；其中，該固定螺帽71，係螺設於該固定端部22之外表面，用以限制該固定軸承組33和固定端部22間之相互移動；其中，該預拉螺帽72，係螺設於該預拉端部23之外表面，用以限制該預拉軸承組34和預拉端部23間之相互移動；其中，該感測器74，係用以偵測變化；在此實施例中之感測器74係用以偵測預拉端面213之位置變化，而該感測器74偵測到預拉端面213之位置變化後，依該偵測到的位置之數值轉換為一個驅動致動器60作動之信號，所謂作動包含使致動器60伸長或縮短；其中，該致動器60，設於預拉軸承座42及預拉軸承組34之間，以調整預拉軸承座42及預拉軸承組34間之距離；藉以改變該螺旋部21所承受之軸向力，使該螺旋部21因而改變其因為應力所引起的伸長量，以平衡因為溫度改變而產生的熱應變，達到使螺旋部21不因溫度的高低而改變長度的目的。而其中之致動器60可以為一壓電致動器，藉由施予致動器60的電壓不同而改變致動器60的長度。The screw shaft 20 has a spiral portion 21, and the two ends of the spiral portion 21 are respectively connected to a fixed end portion 22 and a pre-tensioned end portion 23; wherein the spiral portion 21 and the pre-tensioned end portion 23 are externally The diameter can be designed to be different in size, and the outer diameter of the spiral portion 21 can be generally designed to be larger than the outer diameter of the pre-tensioned end portion 23 as shown in Fig. 2, and the outer diameter between the spiral portion 21 and the pre-tensioned end portion 23 is a pre-tensioned end surface 213 is formed by the difference; wherein the rolling nut 31 is screwed to the spiral portion 21 for transmitting power; wherein the bed 40 is provided with a fixed bearing seat 41 and a pre-preparation The bearing block 42 is provided with a fixed bearing set 33 for pivoting the fixed end portion 22, and the pre-tensioned bearing block 42 is provided with a pre-tensioned bearing set 34 for the pre-tensioned end portion 23 In order to make the deformation amount of the fixed bearing housing 41 smaller than the deformation amount of the pre-tension bearing housing 42, the pre-tension bearing housing thickness W2 can be designed to be smaller than the fixed bearing housing thickness W1 to bend the fixed bearing housing 41. The fixing nut 71 is screwed on the outer surface of the fixed end portion 22 for limiting The fixed bearing set 33 and the fixed end portion 22 move relative to each other; wherein the pre-tensioned nut 72 is screwed on the outer surface of the pre-tensioned end portion 23 for limiting the pre-tensioned bearing set 34 and the pre-tensioning The sensores 74 are used to detect changes; the sensor 74 in this embodiment is used to detect the positional change of the pre-tensioned end surface 213, and the sensing is performed. After detecting the change of the position of the pre-tensioned end surface 213, the device 74 converts the value of the detected position into a signal for driving the actuator 60 to actuate, the so-called actuation includes extending or shortening the actuator 60; wherein The actuator 60 is disposed between the pre-tension bearing housing 42 and the pre-tension bearing group 34 to adjust the distance between the pre-tension bearing housing 42 and the pre-tension bearing group 34; thereby changing the axial force of the spiral portion 21 The spiral portion 21 is thus changed in its elongation due to stress to balance the thermal strain due to the temperature change, so that the spiral portion 21 does not change its length due to the temperature. The actuator 60 therein may be a piezoelectric actuator, and the length of the actuator 60 is changed by the voltage applied to the actuator 60.
在此實施例中，固定端部22係區分為一固定圓柱段221與一固定陽螺紋段222，該固定圓柱段221上係套設該固定軸承組33，而樞設於該固定軸承座41上，該固定陽螺紋段222係和固定螺帽71相互螺合；而該預拉端部23區分為一預拉圓柱段231與一預拉陽螺紋段232，於該預拉圓柱段231上係套設該預拉軸承組34，而樞設於該預拉軸承座42上，預拉陽螺紋段232係供該預拉螺帽72螺設。前述之固定軸承組33通常包含兩個或多個相互反向的斜角滾珠(柱)軸承以承受軸向負荷，也可以使用一交叉滾柱軸承等可承受軸向力的軸承來達到相同的效果；而，預拉軸承組34通常由一個或多個同向的斜角滾珠(柱)軸承組成，以承受施加預拉時所產生的軸向負荷。為了方便組立及增加扭轉剛性的考量，固定軸承組33及預拉軸承組34中可以附設置數間隔環。In this embodiment, the fixed end portion 22 is divided into a fixed cylindrical section 221 and a fixed male threaded section 222. The fixed cylindrical section 221 is sleeved with the fixed bearing set 33 and pivoted to the fixed bearing seat 41. The fixed male threaded portion 222 and the fixed nut 71 are screwed to each other; and the pre-tensioned end portion 23 is divided into a pre-tensioned cylindrical section 231 and a pre-pulled male threaded section 232 on the pre-tensioned cylindrical section 231. The pre-tensioned bearing set 34 is sleeved on the pre-tensioned bearing block 42 and the pre-tensioned threaded section 232 is provided for the pre-tensioned nut 72 to be screwed. The aforementioned fixed bearing set 33 usually comprises two or more mutually opposite angled ball (column) bearings to bear the axial load, and a bearing such as a cross roller bearing that can withstand the axial force can be used to achieve the same. The pre-tensioned bearing set 34 is typically comprised of one or more co-directional bevel ball (column) bearings to withstand the axial loads created by the application of the pre-tension. In order to facilitate the assembly and increase the torsional rigidity, a plurality of spacer rings may be attached to the fixed bearing set 33 and the pre-tensioned bearing set 34.
此外，在此實施例中，螺旋部21上具有一滾動溝211，而滾動螺帽31具有一通孔，通孔之內徑上則具有一與該滾動溝211形成一負荷路徑的滾動槽311，且於該負荷路徑內設有複數個滾動元件32於滾動螺帽31間循環滾動。經由複數個滾動元件32於滾動螺帽31間循環滾動，可以降低相對運動的摩擦阻力，使螺旋部21的發熱量減少，進而使螺旋部21的溫度改變量減少。其中之滾動元件32可以是呈球形之滾珠，或者是呈圓柱形之滾柱。In addition, in this embodiment, the spiral portion 21 has a rolling groove 211, and the rolling nut 31 has a through hole, and the inner diameter of the through hole has a rolling groove 311 which forms a load path with the rolling groove 211. A plurality of rolling elements 32 are cyclically rolled between the rolling nuts 31 in the load path. By rolling between the rolling nuts 31 via the plurality of rolling elements 32, the frictional resistance of the relative movement can be reduced, the amount of heat generated by the spiral portion 21 can be reduced, and the amount of temperature change of the spiral portion 21 can be reduced. The rolling element 32 may be a spherical ball or a cylindrical roller.
以上所述即為本發明實施例各主要構件之結構及其組態說明。至於本發明的作動方式及功效請參考以下的說明。The above description is the structure and configuration description of each main component of the embodiment of the present invention. Please refer to the following description for the mode of operation and efficacy of the present invention.
參閱第2圖，圖中顯示該螺桿軸20已進行預拉後的示意圖，其中該床台40上的預拉軸承座42有較明顯的變形(在此故意誇示此變形量，以容易了解)，而固定軸承座41因為厚度較大而剛性較大，彎曲量相對比較不明顯。當機台開始運轉後，該螺桿軸20開始運轉，該螺桿軸20的溫度會慢慢改變，預拉力也會慢慢改變，如果該螺旋部21的溫度上升時，則螺旋部21的熱應變(strain)會因為溫度上昇而增加，因此需要減少致動器60的長度以降低螺旋部21所受到的預拉力，並減少由於預拉力而產生的彈性變形量，以使螺旋部21的總變形量(熱變形加上彈性變形)維持一定值。參閱第3圖，該感測器74將偵測到該預拉端面213的位置變化(偏移)而輸出一位移信號，該位移信號則傳至該致動器60，使該致動器60的長度縮短，進而施予該螺桿軸20的預拉力量減少，使該預拉端面213相對床台40維持不動；同樣的，當該螺桿軸20的螺旋部21的預拉端面213因溫度降低而向右漂移時，該感測器74則偵測到該預拉端面213的位置變化，而輸出一位移信號給致動器60，使該致動器60的長度增長，而預拉力因而增加，則螺旋部21因為預拉力增加而變長，最終使該螺桿軸20的預拉端面213相對於床台40維持不動。是以，本發明藉由該感測器74的檢測，而相對應的驅動該致動器60作動，使該螺桿軸20在溫度有變化時，其預拉端面213不會左右飄移，以減少機台的熱變位的產生，據此，本發明確實得以改善該螺桿軸20溫度改變時螺旋部21的熱變位，而可增進機台的定位精度。Referring to Fig. 2, there is shown a schematic view of the pre-tensioned shaft 20 of the screw shaft 20, wherein the pre-tensioned bearing block 42 on the bed 40 has a relatively obvious deformation (the amount of deformation is deliberately exaggerated here for easy understanding). However, the fixed bearing housing 41 has a large rigidity and a large rigidity, and the amount of bending is relatively inconspicuous. When the machine starts to operate, the screw shaft 20 starts to operate, the temperature of the screw shaft 20 changes slowly, and the pre-tension is also slowly changed. If the temperature of the spiral portion 21 rises, the thermal strain of the spiral portion 21 is changed. The strain will increase due to the temperature rise, so it is necessary to reduce the length of the actuator 60 to reduce the pre-tensioning force applied to the spiral portion 21, and to reduce the amount of elastic deformation due to the pre-tension, so that the total deformation of the spiral portion 21 is made. The amount (thermal deformation plus elastic deformation) maintains a certain value. Referring to FIG. 3, the sensor 74 detects a change (offset) of the position of the pre-tensioned end surface 213 and outputs a displacement signal, and the displacement signal is transmitted to the actuator 60 to cause the actuator 60. The length of the screw shaft 20 is shortened, and the pre-tensioning force applied to the screw shaft 20 is reduced, so that the pre-tensioned end surface 213 is maintained relative to the bed 40; likewise, when the pre-tensioned end surface 213 of the spiral portion 21 of the screw shaft 20 is lowered due to temperature When drifting to the right, the sensor 74 detects a change in the position of the pre-tensioned end surface 213, and outputs a displacement signal to the actuator 60, so that the length of the actuator 60 is increased, and the pre-tension is increased. Then, the spiral portion 21 becomes long because the pre-tension is increased, and finally the pre-tensioned end surface 213 of the screw shaft 20 is kept stationary with respect to the bed 40. Therefore, in the present invention, the actuator 60 is driven by the detection of the sensor 74, so that the pre-tensioned end surface 213 of the screw shaft 20 does not drift left and right when the temperature changes. According to the present invention, the heat displacement of the spiral portion 21 when the temperature of the screw shaft 20 is changed can be improved, and the positioning accuracy of the machine can be improved.
參閱第4圖為本發明另一實施的示意圖，一個感測器76係鄰接於該床台40的固定軸承座41設置，該感測器76為一溫度感測器，用以感測該固定軸承座41的溫度。當該感測器76偵測到該固定軸承座41溫度變化時，以偵測的數據回饋一補正訊號，經放大器後驅動該致動器60作動，藉以改變該螺旋部21所承受之軸向力，使該螺旋部21因而改變其因為應力所引起的伸長量，以平衡因為溫度改變而產生的熱應變，達到使螺旋部21不因溫度的高低而改變長度的目的。4 is a schematic view of another embodiment of the present invention. A sensor 76 is disposed adjacent to the fixed bearing housing 41 of the bed 40. The sensor 76 is a temperature sensor for sensing the fixing. The temperature of the bearing housing 41. When the sensor 76 detects the temperature change of the fixed bearing block 41, the corrected data is fed back by the detected data, and the actuator 60 is driven by the amplifier to change the axial direction of the spiral portion 21. The force causes the spiral portion 21 to change its elongation due to stress to balance the thermal strain due to the temperature change, so that the spiral portion 21 does not change its length due to the temperature.
參閱第5圖為本發明又一實施的示意圖，一個感測器77係鄰接於該床台40的預拉軸承座42設置，該感測器77為一溫度感測器，用以感測該預拉軸承座42的溫度。當該感測器77偵測到該預拉軸承座42溫度變化時，以偵測的數據回饋一補正訊號，經放大器後驅動該致動器60作動，藉以改變該螺旋部21所承受之軸向力，使該螺旋部21因而改變其因為應力所引起的伸長量，以平衡因為溫度改變而產生的熱應變，達到使螺旋部21不因溫度的高低而改變長度的目的。5 is a schematic view of a further embodiment of the present invention. A sensor 77 is disposed adjacent to the pre-tension bearing housing 42 of the bed 40. The sensor 77 is a temperature sensor for sensing the The temperature of the bearing housing 42 is pre-tensioned. When the sensor 77 detects the temperature change of the pre-tensioned housing 42, the corrected data is fed back with the detected data, and the actuator 60 is driven by the amplifier to change the axis of the spiral portion 21. The force causes the spiral portion 21 to change its elongation due to stress to balance the thermal strain due to the temperature change, so that the spiral portion 21 does not change its length due to the temperature.
參閱第6圖為本發明再一實施的示意圖，一個感測器78係鄰接於該滾動螺帽31設置，該感測器78為一溫度感測器，用以感測該滾動螺帽31的溫度。當該感測器78偵測到該滾動螺帽31溫度變化時，以偵測的數據回饋一補正訊號，經放大器後驅動該致動器60作動，藉以改變該螺旋部21所承受之軸向力，使該螺旋部21因而改變其因為應力所引起的伸長量，以平衡因為溫度改變而產生的熱應變，達到使螺旋部21不因溫度的高低而改變長度的目的。FIG. 6 is a schematic view showing still another embodiment of the present invention. A sensor 78 is disposed adjacent to the rolling nut 31. The sensor 78 is a temperature sensor for sensing the rolling nut 31. temperature. When the sensor 78 detects the temperature change of the rolling nut 31, the corrected data is fed back with a corrected signal, and the actuator 60 is driven by the amplifier to change the axial direction of the spiral portion 21. The force causes the spiral portion 21 to change its elongation due to stress to balance the thermal strain due to the temperature change, so that the spiral portion 21 does not change its length due to the temperature.
而前述之溫度和螺旋部21長度的補正關係，可以實驗的方式或力學的分析來獲得。The correction relationship between the aforementioned temperature and the length of the spiral portion 21 can be obtained experimentally or mechanically.
綜上所述，此實施例及圖示僅為本發明的較佳實施例而已，當不能以之限定本發明實施之範圍，即大凡依本發明申請專利範圍所作的均等變化與修飾，皆應屬本發明專利涵蓋的範圍內。In the above, the embodiments and the illustrations are only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the equal changes and modifications made by the scope of the patent application of the present invention should be It is within the scope of the patent of the present invention.
11．．．螺桿軸11. . . Screw shaft
111．．．固定端部111. . . Fixed end
112．．．預拉端部112. . . Pre-tensioned end
113．．．螺旋部113. . . Spiral part
12．．．固定軸承座12. . . Fixed bearing
13．．．預拉軸承座13. . . Pre-tensioned bearing housing
14．．．床台14. . . Bed
A．．．螺旋部右端點A. . . Right end of the helix
B．．．螺旋部左端點B. . . Left end of the helix
20．．．螺桿軸20. . . Screw shaft
21．．．螺旋部twenty one. . . Spiral part
211．．．滾動溝211. . . Rolling groove
213．．．預拉端面213. . . Pre-tensioned end face
22．．．固定端部twenty two. . . Fixed end
221．．．固定圓柱段221. . . Fixed cylindrical section
222．．．固定陽螺紋段222. . . Fixed male thread segment
23．．．預拉端部twenty three. . . Pre-tensioned end
231．．．預拉圓柱段231. . . Pre-pulled cylindrical section
232．．．預拉陽螺紋段232. . . Pre-pulling thread section
31．．．滾動螺帽31. . . Rolling nut
311．．．滾動槽311. . . Rolling groove
32．．．滾動元件32. . . Rolling element
33．．．固定軸承組33. . . Fixed bearing set
34．．．預拉軸承組34. . . Pre-tensioned bearing set
40．．．床台40. . . Bed
41．．．固定軸承座41. . . Fixed bearing
W1．．．固定軸承座厚度W1. . . Fixed housing thickness
42．．．預拉軸承座42. . . Pre-tensioned bearing housing
W2．．．預拉軸承座厚度W2. . . Pre-tensioned housing thickness
60．．．致動器60. . . Actuator
71．．．固定螺帽71. . . Fixed nut
72．．．預拉螺帽72. . . Pre-tensioned nut
74．．．感測器74. . . Sensor
76．．．感測器76. . . Sensor
77．．．感測器77. . . Sensor
78．．．感測器78. . . Sensor
第1圖 係為習知滾動螺桿組設於床台上之示意圖，顯示螺桿預拉後的狀態。Fig. 1 is a schematic view showing a conventional rolling screw set on a bed, showing the state after the screw is pre-tensioned.
第2圖 係為本發明組設有滾動螺桿的示意圖。Fig. 2 is a schematic view showing a rolling screw provided in the group of the invention.
第3圖 係本發明作動後的示意圖。Figure 3 is a schematic diagram of the operation of the present invention.
第4圖 係本發明另一實施示意圖，顯示感測器鄰接於固定軸承座的狀態。Figure 4 is a schematic view of another embodiment of the present invention showing the state in which the sensor is adjacent to the fixed bearing housing.
第5圖 係本發明又一實施示意圖，顯示感測器鄰接於預拉軸承座的狀態。Fig. 5 is a schematic view showing still another embodiment of the present invention, showing a state in which the sensor is adjacent to the pre-tensioned bearing housing.
第6圖 係本發明再一實施示意圖，顯示感測器鄰接於滾動螺帽的狀態。Figure 6 is a schematic view of still another embodiment of the present invention showing the state in which the sensor is adjacent to the rolling nut.
20．．．螺桿軸20. . . Screw shaft
21．．．螺旋部twenty one. . . Spiral part
211．．．滾動溝211. . . Rolling groove
213．．．預拉端面213. . . Pre-tensioned end face
22．．．固定端部twenty two. . . Fixed end
221．．．固定圓柱段221. . . Fixed cylindrical section
222．．．固定陽螺紋段222. . . Fixed male thread section
23．．．預拉端部twenty three. . . Pre-tensioned end
231．．．預拉圓柱段231. . . Pre-pulled cylindrical section
232．．．預拉陽螺紋段232. . . Pre-pulling thread section
31．．．滾動螺帽31. . . Rolling nut
311．．．滾動槽311. . . Rolling groove
32．．．滾動元件32. . . Rolling element
33．．．固定軸承組33. . . Fixed bearing set
34．．．預拉軸承組34. . . Pre-tensioned bearing set
40．．．床台40. . . Bed
41．．．固定軸承座41. . . Fixed bearing
42．．．預拉軸承座42. . . Pre-tensioned bearing housing
60．．．致動器60. . . Actuator
71．．．固定螺帽71. . . Fixed nut
72．．．預拉螺帽72. . . Pre-tensioned nut
74．．．感測器74. . . Sensor
W1．．．固定軸承座厚度W1. . . Fixed housing thickness
W2．．．預拉軸承座厚度W2. . . Pre-tensioned housing thickness
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW99147154A TWI411733B (en) | 2010-12-31 | 2010-12-31 | Structure for conciliating hot deformation of a rolling screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW99147154A TWI411733B (en) | 2010-12-31 | 2010-12-31 | Structure for conciliating hot deformation of a rolling screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201226745A TW201226745A (en) | 2012-07-01 |
| TWI411733B true TWI411733B (en) | 2013-10-11 |
Family
ID=46932929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW99147154A TWI411733B (en) | 2010-12-31 | 2010-12-31 | Structure for conciliating hot deformation of a rolling screw |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI411733B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5025914A (en) * | 1988-08-31 | 1991-06-25 | Okuma Machinery Works, Ltd. | Feed-screw support structure |
| TW200846130A (en) * | 2007-05-25 | 2008-12-01 | Awea Mechantronic Co Ltd | Thermal deformation control device and method for feed mechanism |
-
2010
- 2010-12-31 TW TW99147154A patent/TWI411733B/en active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5025914A (en) * | 1988-08-31 | 1991-06-25 | Okuma Machinery Works, Ltd. | Feed-screw support structure |
| TW200846130A (en) * | 2007-05-25 | 2008-12-01 | Awea Mechantronic Co Ltd | Thermal deformation control device and method for feed mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201226745A (en) | 2012-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4824080B2 (en) | Synchronous control system | |
| JP5882097B2 (en) | Rolling bearing device manufacturing apparatus and rolling bearing device manufacturing method | |
| CN104088871A (en) | Precision positioning drive-end pre-tightening device | |
| CN104565252A (en) | Dual-nut ball screw assembly with controllable pre-tightening force | |
| US20150275981A1 (en) | Universal joint assembly method and universal joint assembly apparatus | |
| US9399250B2 (en) | Thread rolling method for gear using cylindrical dies | |
| TWI411733B (en) | Structure for conciliating hot deformation of a rolling screw | |
| JP2008101711A (en) | Method for combining ball screw with rolling bearing and ball screw device | |
| Ciou et al. | Controllable preload spindle with a piezoelectric actuator for machine tools | |
| CN113710926B (en) | Lead screw device capable of detecting pre-pressing | |
| CN104675947B (en) | A kind of planetary roller screw and its load are evenly distributed with method | |
| JP2007198425A (en) | Preloading device and preloading method for rolling bearing, and bearing unit | |
| TW201919850A (en) | Double-side transfer type sheet-film molding roll apparatus double-side transfer type sheet-film molding method | |
| CN202701885U (en) | Ball screw supporting construction | |
| JP2015025546A (en) | Support structure for shaft and manufacturing method of support structure for shaft | |
| JP6582603B2 (en) | Ball screw preload recovery device | |
| US11359670B2 (en) | Transmission roller, and pin-teeth cycloid reducer with the same and bearing with the same | |
| TWI398586B (en) | Thermal deformation adjustment screw for a ball screw | |
| TWI686588B (en) | Thermal elongation measuring device | |
| CN103707256A (en) | Multistation axial clutch structure for roller pins of manual torque screwdriver | |
| KR20200066621A (en) | Double row ball bearing and its manufacturing method | |
| JP2007321789A (en) | Machine component assembling method | |
| JP2005325956A (en) | Ball screw for motor-driven actuator | |
| WO2021125130A1 (en) | Method for manufacturing hydraulic pressure control valve | |
| JP2001330031A (en) | Rolling bearing device and method of determining pre- load thereof |