Structure for achieving uniform temperature of rotating mandrel quickly

Abstract

The present application discloses a structure for quickly achieving temperature uniformity of a rotating spindle, which comprises a spindle housing, a spindle, a heat exchange ring and a conducting member. The spindle housing is formed with a fluid inlet and a fluid outlet at two sides respectively. The spindle is rotatably supported in the spindle housing by bearings, and a plurality of assembly holes are formed in a truncated surface of one end of the spindle. The heat exchange ring is connected to one end of the spindle and has an exchange groove and a plurality of matching fluid outlet and inlet communication holes. The conducting member is connected to the heat exchange ring at one end and accommodated in the assembly holes at the other end. By means of the above components, the conducting member has a higher heat conduction coefficient than the physical properties of the spindle, and the spindle is quickly heated and maintained at a uniform temperature by heat exchange.

Description

Technical Field

[0001] This invention relates to the technical field of machining machine spindles, and in particular to a structure for rapidly achieving uniform temperature on a rotating spindle. Background Technology

[0002] In the spindle assembly of a machining center, the spindle is rotatably supported in the spindle housing by multiple bearings. The spindle housing further houses the drive motor used to rotate the spindle. When the spindle rotates, both the supporting bearings and the drive motor generate heat. When the spindle is heated, it experiences axial displacement (commonly known as thermal expansion). The tool attached to the spindle will then experience a relative axial position change with the workpiece it is in contact with. Any change in position will affect machining accuracy.

[0003] It is known that a temperature rise will inevitably occur after the spindle is activated, and the temperature will continue to accumulate (rise) over time. Therefore, during general operation, users are required to let the spindle idle for a period of time before loading and processing materials.

[0004] However, to improve stability, machining machines are designed with materials and structures that have low thermal conductivity as much as possible to avoid affecting machining accuracy due to changes in ambient or other temperatures. Mandrels, in particular, are often made of materials with low thermal conductivity.

[0005] As mentioned above, the spindle must be preheated by idling before it reaches the working temperature. However, due to the low thermal conductivity of the spindle, the idling preheating time must be extended, resulting in a waste of time and energy.

[0006] Unable to actively preheat, traditional technology must rely on the spindle to idle for a long time to achieve the preheating effect, and cannot shorten the preheating time through an external heat source.

[0007] There is a real need to improve the existing spindle structure in order to quickly bring the spindle to a uniform preheating temperature, thereby reducing waiting time and energy waste. Summary of the Invention

[0008] In view of the problems and deficiencies of the prior art, one object of the present invention is to provide a structure through structural innovation that allows a rotating mandrel to quickly achieve uniform temperature, thereby overcoming the deficiencies of the prior art.

[0009] A structure for rapidly achieving uniform temperature using a rotating mandrel includes:

[0010] A main shaft housing is a hollow component with a predetermined length. A fluid inlet and a fluid outlet are respectively formed on one side of the main shaft housing in the extending direction.

[0011] A spindle is rotatably supported within the spindle housing by multiple bearings, and the cross-section of one end of the spindle in the extending direction is recessed with a plurality of assembly holes;

[0012] A heat exchange ring, which is a hollow annular component connected in series to one end of the mandrel, has an internally formed exchange groove, a plurality of connecting holes formed through the outer periphery of the heat exchange ring, connecting the exchange groove, the fluid inlet, and the fluid outlet, and further includes:

[0013] A first ring member has a connecting portion, an inner ring portion and an outer ring portion symmetrically formed on the same end face of the connecting portion, which together define the exchange groove, wherein the outer ring portion has each of the connecting holes through it, and the inner ring portion has a plurality of insertion holes through it matching each of the assembly holes; and

[0014] A second ring component has a cover portion and an abutting ring portion, wherein the cover portion is assembled on the outer ring portion and closes the preset open end of the exchange slot, while the abutting ring portion is disposed facing the inner ring portion and together define a clamping groove communicating with the exchange slot; and

[0015] A conductive element, one end of which is connected to the heat exchange ring and the other end of which is inserted into each of the assembly holes, and the thermal conductivity of the conductive element is higher than that of the mandrel, includes a ring plate housed in the clamping groove, and a plurality of rod portions connected to the ring plate and extending through and matching each of the insertion holes and the assembly holes.

[0016] Furthermore, the outer contour of each rod is selected from a rod-shaped contour or a sheet-shaped contour.

[0017] Furthermore, the position of the hole wall of each assembly hole is smaller than the outer diameter of the mandrel.

[0018] Furthermore, the characteristic feature is that each of the conductive elements is selected from artificial graphite.

[0019] By utilizing the composition of the above components and taking advantage of the physical property that the thermal conductivity of the conductive component is higher than that of the mandrel, heat exchange occurs between the conductive component and the mandrel, thereby rapidly increasing and maintaining the overall temperature of the mandrel. Attached Figure Description

[0020] Figure 1 This is a three-dimensional appearance diagram of an embodiment of the present invention.

[0021] Figure 2 yes Figure 1 The illustrated embodiment is a partial cross-sectional schematic diagram.

[0022] Figure 3 yes Figure 1 A cross-sectional schematic diagram of the embodiment shown (I).

[0023] Figure 4 yes Figure 1 Schematic cross-sectional view of the embodiment shown (II).

[0024] Figure 5 yes Figure 1 The illustrated embodiment is shown in a partial component exploded view.

[0025] Figure 6 yes Figure 5 The illustrated embodiment is shown in a partial component exploded view.

[0026] 10: Spindle housing

[0027] 10A: First spindle housing

[0028] 10B: Second spindle housing

[0029] 11: Fluid inlet

[0030] 12: Fluid outlet

[0031] 20: Mandrel

[0032] 21: Assembly Hole

[0033] 30: Heat exchange ring

[0034] 31: First Ring Component

[0035] 311: Connecting part

[0036] 312: Inner Ring Road

[0037] 313: Outer Ring Road

[0038] 314: Insertion Hole

[0039] 315: Connecting hole

[0040] 316: Exchange slot

[0041] 32: Second ring component

[0042] 321: Cover

[0043] 322: Abutting ring

[0044] 40: Transmission component

[0045] 41: Ring plate

[0046] 42: Bar section

[0047] A: Groove

[0048] B: Bearing Detailed Implementation

[0049] The following description, with reference to the accompanying drawings, further illustrates the structural embodiments of the present invention for rapidly achieving uniform temperature using a rotating mandrel. Various objects in the embodiments are depicted according to the scale, dimensions, deformation, or displacement suitable for illustration, rather than being drawn to scale with actual components; this is stated prior to the description. Furthermore, elements in the remaining embodiments that are identical or symmetrically arranged are represented by the same numbers. Additionally, directional terms such as "front," "back," "left," "right," "up," "down," "inner," and "outer" in the descriptions of the embodiments listed below are used according to the specified view direction and should not be construed as limiting the scope of the present invention.

[0050] Please see Figures 1 to 6 As shown, the structure of the rotating mandrel of the present invention for quickly achieving uniform temperature includes a main shaft housing 10, a mandrel 20, a heat exchange ring 30, and a conductive element 40.

[0051] The aforementioned spindle housing 10 is a hollow component of a predetermined length, with a fluid inlet 11 and a fluid outlet 12 formed on one side of the spindle housing 10 respectively in the extending direction.

[0052] The spindle housing 10 further includes a first spindle housing 10A and a second spindle housing 10B connected in series; wherein the fluid inlet 11 and the fluid outlet 12 are respectively disposed in the second spindle housing 10B.

[0053] The aforementioned spindle 20 is a hollow component of a predetermined length, rotatably supported within the spindle housing 10 (first spindle housing 10A) by multiple bearings B. The spindle 20 has a plurality of assembly holes 21 recessed in a cross-section along its extension direction. In practice, the assembly holes 21 can be through holes penetrating the spindle 20 or blind holes not penetrating it. Their positions are less than or equal to the outer diameter of the spindle 20.

[0054] The aforementioned heat exchange ring 30 is a hollow ring-shaped component, connected in series to one end of the spindle 20 and moving together with it, including a first ring 31 and a second ring 32 connected to each other.

[0055] The first ring member 31 has a connecting portion 311, an inner ring portion 312 and an outer ring portion 313 symmetrically formed on the same end face of the connecting portion 311, and a number of insertion holes 314 formed through the inner ring portion 312 and a number of connecting holes 315 formed through the outer ring portion 313.

[0056] The connecting part 311, the inner ring part 312 and the outer ring part 313 together define an exchange slot 316.

[0057] The second ring member 32 has a cover portion 321 and an abutting ring portion 322 that are orthogonally connected. The cover portion 321 is fastened to the cross-section of the outer ring portion 313 and closes the preset open end of the exchange groove 316. The abutting ring portion 322 is arranged facing the inner ring portion 312 of the first ring member 31 and together they define a clamping groove A.

[0058] The aforementioned conductive member 40 has one end inserted into the assembly hole 21 of the spindle 20 and the other end accommodated in the insertion hole 314 and the clamping groove A of the heat exchange ring 30. It includes a ring plate 41 and a plurality of rods 42 with one end connected to the ring plate 41. The ring plate 41 is accommodated in the clamping groove A and the exchange groove 316 of the heat exchange ring 30, and each rod 42 extends through the insertion hole 314 (the first ring member 31) and is inserted into the assembly hole 21 of the spindle 20.

[0059] In practice, the outer contour of the rod 42 is selected from either a rod-shaped contour or a sheet-shaped contour.

[0060] Furthermore, the conductive element 40 is made of a material with a higher thermal conductivity than the mandrel 20. For example, graphite, which has high thermal conductivity, or artificial graphite obtained by stacking graphene layers through chemical vapor deposition. Additionally, artificial graphite can be controlled to exhibit high thermal conductivity in only two of the three axes, while exhibiting extremely low thermal conductivity in the remaining axis. In this embodiment, the conductive element 40 has high thermal conductivity in both the axial and radial directions extending within the insertion hole 314.

[0061] The above is an introduction to the structural components and assembly method of a preferred embodiment of the present invention, which uses a rotating mandrel to quickly achieve uniform temperature. The operating characteristics of the embodiments of the present invention are described below.

[0062] During implementation, the heat source generated by the operation of the mandrel 20 will exchange heat with the rod 42 in each assembly hole 21, transferring the heat source along the rod 42 as a whole. By taking advantage of the fact that the thermal conductivity of the rod 42 is higher than that of the mandrel 20, heat exchange will be carried out in the opposite direction to the low temperature zone of the mandrel 20, thereby quickly achieving a uniform temperature for the mandrel 20.

[0063] In addition, when the temperature of the spindle 20 reaches the preset value, to avoid continuous temperature rise, a heat exchange device (not shown in the figure) can be connected to the fluid inlet 11 and fluid outlet 12 of the spindle housing 10 respectively. The heat exchange fluid is transported through the fluid inlet 11 of the spindle housing 10 and the connecting hole 315 of the heat exchange ring 30, and then enters the exchange groove 316 of the heat exchange ring 30, where it exchanges heat with the ring plate 41 (rod 42) of the conductive member 40. After that, it flows back to the heat exchange device through the connecting hole 315 and the fluid outlet 12 of the spindle housing 10, thereby achieving the purpose of stabilizing the temperature of the spindle 20.

[0064] Conversely, a heat exchange device can be used to provide heat exchange fluid into the heat exchange ring 30 to exchange heat with the conductive element 40, thereby heating the mandrel with an external heat source and shortening the preheating time.

[0065] The above description is merely a preferred embodiment of the present invention and is intended to clarify the features of the present invention. It is not intended to limit the scope of the embodiments of the present invention. Equivalent variations made by those skilled in the art based on the present invention, as well as changes well known to those skilled in the art, should still fall within the scope of the present invention.

Claims

1. A structure for quickly achieving uniform temperature of a rotating mandrel, characterized by, The application relates to a heat exchange device, comprising: a spindle housing, which is a hollow member with a preset length, and a fluid inlet and a fluid outlet are formed on the two sides of the spindle housing respectively; a spindle, which is rotatably supported in the spindle housing through bearings, and a plurality of assembly holes are formed in the truncated surface of one end of the spindle in the extending direction; a heat exchange ring, which is a ring-shaped hollow member and is connected to one end of the spindle, has an exchange groove formed in the interior, a plurality of communication holes formed through the outer circumferential side of the heat exchange ring, and communicates the exchange groove, the fluid inlet and the fluid outlet; and a first ring member, which has a connecting part, an inner ring part and an outer ring part symmetrically formed on the same end surface of the connecting part, and jointly defines the exchange groove, wherein the outer ring part is formed with the communication holes, and the inner ring part is formed with a plurality of insertion holes matched with the assembly holes; and a second ring member, which has a cover part and an abutting ring part, wherein the cover part is arranged on the outer ring part and closes the preset open end of the exchange groove, and the abutting ring part faces the inner ring part and jointly defines a clamping groove which communicates the exchange groove; and a conducting member, one end of which is connected to the heat exchange ring, and the other end is inserted into the assembly holes, and the heat conduction coefficient of the conducting member is higher than that of the spindle, which comprises a ring piece arranged in the clamping groove, a plurality of rod parts connected with the ring piece and penetratingly matched with the insertion holes and the assembly holes; the heat exchange between the conducting member and the spindle is carried out by using the physical property that the heat conduction coefficient of the conducting member is higher than that of the spindle, so that the overall temperature of the spindle is rapidly increased and maintained.

2. The structure for achieving uniform temperature of a rotary mandrel quickly according to claim 1, wherein The outer contour of each rod part is selected from a rod-shaped contour or a sheet-shaped contour.

3. The structure for achieving uniform temperature of the rotary mandrel according to claim 1, wherein The hole wall arrangement position of each assembly hole is smaller than the outer diameter of the spindle.

4. The structure for achieving uniform temperature of the rotary mandrel quickly according to claim 1, wherein The conducting member is selected from artificial graphite.

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