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Device and method to study relationship between interference and thermal contact resistance

A technology of contact thermal resistance and interference, which is applied in the field of devices to explore the relationship between the interference and the contact thermal resistance of the joint surface of the cylindrical sleeve, can solve the problems that the spindle affects the machining accuracy of the machine tool, bearing burns, temperature distribution deviation, etc.

Active Publication Date: 2018-03-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermal deformation will reduce the service life of bearings and other components and even cause bearing burns and seizures. At the same time, thermal elongation of the spindle will also affect the machining accuracy of machine tools. The thermal-mechanical coupling of machine tools has become one of the current research hotspots.
Among them, the thermal network method is gradually adopted by people due to its advantages of convenient and fast calculation and easy programming. However, the traditional thermal network method does not consider the influence of contact thermal resistance, resulting in a large deviation between the calculated results and the actual temperature distribution of the machine tool.

Method used

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  • Device and method to study relationship between interference and thermal contact resistance
  • Device and method to study relationship between interference and thermal contact resistance
  • Device and method to study relationship between interference and thermal contact resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A device for exploring the relationship between the interference amount and the contact thermal resistance of the joint surface of a cylindrical sleeve, including a cooling conical mandrel 11, a ring 4, a sleeve 3, a host computer and a support 6,

[0040] The outer surface of the sleeve 3 is provided with a heating film 12 for maintaining the constant temperature of the outer surface of the sleeve 3; wherein, the heating film 12 is a common thermal insulation heating device, which has a heater, a temperature detector and a feedback controller, The temperature detector detects the temperature of itself or the outer surface of the sleeve 3, and transmits the detection result to the feedback controller; the feedback controller determines the heating power of the heater according to the set target.

[0041] The ring 4 is at the same height as the sleeve 3, the outer surface of the ring 4 is in contact with the inner surface of the sleeve 3, and the inner cavity of the ring ...

Embodiment 2

[0069] The present invention designs a device for exploring the relationship between the interference amount and the contact thermal resistance of the joint surface of the cylindrical sleeve. The technical scheme of the device is as follows:

[0070] The detection device includes a cooling conical mandrel 11, a four-lobed ring 4, a sleeve 3, a heating film 12, a screw loader 8, a thrust bearing 7, a heat insulation cover, a support 6, a vacuum cover, and the like. All other components except the vacuum hood are placed inside the vacuum hood. The inner hole of the cooling conical mandrel 11 is used for circulating cooling water, and the upper and lower parts are connected with water pipes with pipe threads, and the direction of circulating cooling water is from bottom to top; , the four-petal ring 4 is to divide the ring 4 into four equal parts to realize external expansion; the four-petal ring 4 is radially externally connected to the sleeve 3, and the outer wall of the sleeve...

Embodiment 3

[0085] Such as Figure 1 to Figure 4 As shown, the device designed in the present invention to explore the relationship between the interference amount and the contact thermal resistance of the cylindrical sleeve joint surface includes a cooling conical mandrel 11, a four-lobed ring 4, a sleeve 3, a heating film 12, a spiral loading Device 8, thrust bearing 7, upper heat insulation cover 5, lower heat insulation cover 2, support 6 and vacuum cover 10.

[0086]The temperature of the heating film 12 on the outer surface of the sleeve 3 is kept constant, and the cooling conical mandrel 11 is fed with circulating constant temperature cooling water, and the water pipes are threaded through the upper and lower pipes in the cooling conical mandrel. The four-lobe ring 4 and the upper and lower end faces of the sleeve 3 are insulated with a heat insulating cover. This ensures a large temperature gradient in the radial direction, improves test accuracy, and facilitates later data proce...

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Abstract

The invention provides a device and method to study relationship between interference and thermal contact resistance. The device comprises a cooling conical spindle, a ring and sleeve equal in height,an upper computer, and a support; the outer side of the sleeve is provided with heating film, the outer side of the ring is in contact connection with the inner side of the sleeve, and an inner cavity of the ring fits the lower end of the cooling conical spindle; the ring is radially divided into 2-6 ring units; the cooling conical spindle is connected with a cooling medium circulation pipeline,and the upper end of the cooling conical spindle fits the lower end of a spiral loader; the upper end of the cooling conical spindle is greater than its lower end in diameter; the spiral loader is fixed on the support; the support and the sleeve are fixed to each other, wherein both the sleeve and the ring are axially provided with two temperature detection holes, a temperature sensor is arrangedin each temperature detection hole, and a probe of each temperature sensor is arranged at the corresponding axial center. The device and method have the advantages that magnitude of thermal contact resistance of joint faces of a cylinder and sleeve under different interferences can be measured and data support is provided for completing a thermal network method.

Description

technical field [0001] The invention belongs to the technical field of contact thermal resistance detection, and in particular relates to a device and a method for exploring the relationship between the interference amount and the contact thermal resistance of a joint surface of a cylindrical sleeve. Background technique [0002] During the operation of the main shaft, the motor, belt, bearing and other related moving parts will generate heat due to friction and loss, which will cause thermal deformation. Thermal deformation will reduce the service life of bearings and other components and even cause bearing burns and seizures. At the same time, thermal elongation of the spindle will also affect the machining accuracy of machine tools. The thermal-mechanical coupling of machine tools has become one of the current research hotspots. Among them, the thermal network method is gradually adopted by people due to its advantages of convenient and quick calculation and easy programm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 张进华刘译励方斌闫柯朱永生洪军
Owner XI AN JIAOTONG UNIV
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