SCANNING TOOL HOLDER

Abstract

A scanning tool holder (1), comprising: a tool holder unit (10), comprising: a base (11), wherein a passage (111) is formed in the base (11); and an additional body (12) attached to the base (11) by an additive manufacturing process, wherein the additional body (12) comprises: a mounting structure (121) formed on an outer surface (12s) of the additional body (12) and comprising: a plurality of first mounting recesses (121f) arranged in pairs symmetrically to an axis line (L) of the additional body (12) as a symmetrical axis; and a plurality of second mounting recesses (121s) arranged in pairs symmetrically to the axis line (L) of the additional body (12) as a symmetrical axis;a channel (122) coiled and formed in the additional body (12), the channel (122) having an inlet (122i) and an outlet (122o), the inlet (122i) communicating with the passage (111), and a diameter of the outlet (122o) being smaller than a diameter of the inlet (122i); a scanning unit (20) arranged on the mounting structure (121); and a housing (30) mounted around the additional body (12) and covering the scanning unit (20), a closed space (40) being formed between the housing (30) and the additional body (12).

Description

BACKGROUNDField of the invention

[0001] The present disclosure relates to a scanning tool holder and, more particularly, to a scanning tool holder capable of effectively dissipating heat. Description of the state of the art

[0002] To enable direct and convenient sensing of a tool holder, sensors are embedded in the tool holder or attached to it by destroying the tool holder. However, installing sensors by destroying the tool holder affects the dynamic balance of the tool holder and is therefore not ideal. Furthermore, during long machining times, the temperature of the tool holder rises due to the poor heat dissipation effect of the tool holder, which affects the stability of the sensor data transmission. The industry urgently needs to address the above-mentioned problems.

[0003] CN104139322A describes a capacitive intelligent knife handle system for detecting four-dimensional cutting force. The capacitive intelligent knife handle system includes a standard knife handle, a capacitive displacement sensor, a lithium battery, a capacitive sensor detection circuit, a signal preprocessing and acquisition unit, a wireless signal transmission module, an outer packaging ring, a sealing cover, and a mounting block.

[0004] CN215147392U describes a recording device for monitoring working condition parameters of a cutting tool in real time. A cutting tool assembly includes a cutter handle, a cutter clamped onto the cutter handle, and a cutter handle connector that can be clamped onto the cutter handle. The tool clamp can be used to clamp the cutting tool.

[0005] CN115026633A describes an intelligent, multi-component force measuring system for machine tools, comprising a tool handle body, a shell, a fixing ring, a fixing screw, a herringbone force measuring unit, a first beam, a second beam, a third beam, a support piece, a resistance strain gauge, and a mounting groove. SUMMARY

[0006] Therefore, an object of the present disclosure is to provide a scanning tool holder that can increase the installation freedom of sensors and further improve the heat dissipation efficiency.

[0007] According to the aforementioned objectives, the present disclosure provides a scanning tool holder. The scanning tool holder includes a base, an auxiliary body, a scanning unit, and a housing. The auxiliary body is attached to the base by an additive manufacturing process and includes a mounting structure. The mounting structure is formed on an outer surface of the auxiliary body and includes a plurality of first mounting recesses and a plurality of second mounting recesses. The first mounting recesses are arranged in pairs symmetrically with an axis line of the auxiliary body as a symmetrical axis. The second mounting recesses are arranged in pairs symmetrically with the axis line of the auxiliary body as a symmetrical axis. The scanning unit is arranged on the mounting structure. The housing is attached around the auxiliary body and covers the scanning unit. A closed space is formed between the housing and the auxiliary body.

[0008] According to one embodiment of the present disclosure, the additional body is a powder bed melting element.

[0009] According to one embodiment of the present disclosure, a passage is formed in the base. The tool holder unit includes a channel. The channel is coiled and formed in the additional body. The channel includes an inlet and an outlet. The inlet communicates with the channel. A diameter of the outlet is smaller than a diameter of the inlet.

[0010] According to one embodiment of the present disclosure, a center point of the inlet and a center point of the outlet are each located on the axis line of the additional body.

[0011] According to one embodiment of the present disclosure, the sensing unit comprises a circuit board, a transmitting unit, a power supply, and at least one sensor. The transmitting unit is provided on the circuit board. The power supply is configured to supply power required by the circuit board and the transmitting unit. The circuit board and the power supply are provided in symmetrical two of the first mounting recesses. Each of the at least one sensor is provided in a corresponding one of the second mounting recesses and is electrically connected to the circuit board. The transmitting unit is signal-connected to the circuit board and each of the at least one sensor.

[0012] According to an embodiment of the present disclosure, an outer contour of each of the second mounting recesses is polygonal.

[0013] According to one embodiment of the present disclosure, the outer contour of each of the second mounting recesses is hexagonal.

[0014] According to one embodiment of the present disclosure, the channel comprises a spiral section. Two ends of the spiral section are connected to the inlet and the outlet, respectively. An inner diameter of the spiral section is smaller than the diameter of the inlet, and the inner diameter of the spiral section is larger than the diameter of the outlet.

[0015] According to an embodiment of the present disclosure, a minimum distance between a center portion of the spiral portion and the outer surface of the auxiliary body is smaller than a minimum distance between a head portion of the spiral portion and the outer surface of the auxiliary body, and is also smaller than a minimum distance between an end portion of the spiral portion and the outer surface of the auxiliary body.

[0016] According to one embodiment of the present disclosure, the head portion is connected to the inlet. The end portion is connected to the outlet. Two ends of the middle portion are connected to the head portion and the end portion, respectively.

[0017] According to one embodiment of the present disclosure, the minimum distance between the center portion of the spiral portion and the outer surface of the additional body is equal to the minimum distance between the head portion of the spiral portion and the outer surface of the additional body, and also equal to the minimum distance between the end portion of the spiral portion and the outer surface of the additional body.

[0018] According to one embodiment of the present disclosure, the minimum distance between the center portion of the spiral portion and the outer surface of the additional body is equal to the minimum distance between the head portion of the spiral portion and the outer surface of the additional body and is smaller than the minimum distance between the end portion of the spiral portion and the outer surface of the additional body.

[0019] According to one embodiment of the present disclosure, the minimum distance between the center portion of the spiral portion and the outer surface of the additional body is smaller than the minimum distance between the head portion of the spiral portion and the outer surface of the additional body, and equal to the minimum distance between the end portion of the spiral portion and the outer surface of the additional body.

[0020] According to one embodiment of the present disclosure, the housing includes a through-hole. The through-hole faces the transmitting unit.

[0021] According to one embodiment of the present disclosure, the additional body comprises a plurality of fixed sections and a plurality of air sections. The fixed sections are located between the adjacent second mounting recesses. The air sections are located between the fixed sections and the channel.

[0022] According to the aforementioned objectives, the present disclosure provides a scanning tool holder. The scanning tool holder includes a base, an auxiliary body, a scanning unit, a housing, a first sealing ring, and a second sealing ring. The auxiliary body is attached to the base by an additive manufacturing process and includes a mounting structure. The mounting structure is formed on an outer surface of the auxiliary body and includes a plurality of first mounting recesses and a plurality of second mounting recesses. The first mounting recesses are arranged in pairs symmetrically with an axis line of the auxiliary body as a symmetrical axis. The second mounting recesses are arranged in pairs symmetrically with the axis line of the auxiliary body as a symmetrical axis. The scanning unit is arranged on the mounting structure. The housing is attached around the auxiliary body and covers the scanning unit.The first sealing ring is provided between an upper part of the housing and the additional body. The second sealing ring is provided between a lower part of the housing and the additional body.

[0023] The mounting structure of the present disclosure is formed on the outer surface of the auxiliary body and can be used to accommodate the sensing unit, thus increasing the installation freedom of the sensor. The mounting structure provides the second mounting recesses to increase the installation freedom of the sensor. In this way, the sensor can effectively sense and provide real-time sensing data.

[0024] In addition, the channel of the additional body can enlarge the fluid flow path to improve heat dissipation efficiency and maintain a stable working temperature. Furthermore, the diameter of the channel outlet is smaller than the diameter of the inlet, which can provide a pressure-generating effect, increase the jet throughput, and improve the accuracy and efficiency of chip removal, thus achieving the goal of improving machining quality and service life.

[0025] In addition, the housing can protect the scanning unit, so that the service life of the scanning unit can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the above and other objects, features, advantages and embodiments of the present disclosure more apparent, the accompanying drawings are described as follows: Fig. 1A is a schematic three-dimensional representation of a scanning tool holder according to an embodiment of the present disclosure; Fig. 1B is a schematic three-dimensional illustration of the scanning tool holder without a housing according to an embodiment of the present disclosure; Fig. 1C is a schematic plan view of the scanning tool holder according to an embodiment of the present disclosure; Fig. Figure 1D is a schematic cross-sectional view along a line AA in Fig. 1C; Fig. 2A is a schematic three-dimensional representation of an additional body and a scanning unit according to an embodiment of the present disclosure; Fig. Figure 2B is a schematic side view of the additional body and the scanning unit in Fig. 2A; Fig. Figure 2C is a schematic cross-sectional view taken along a line BB in Fig. 2B; and Fig. 3 is a schematic side view of an additional body in a scanning tool holder according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] At the same time, reference should be made to Fig. 1A and Fig. 1B. Fig. 1A is a schematic three-dimensional representation of a scanning tool holder 1 according to an embodiment of the present disclosure. Fig. 1B is a schematic three-dimensional representation of the scanning tool holder 1 without the housing 30 according to an embodiment of the present disclosure. The scanning tool holder 1 comprises a tool holder unit 10, a scanning unit 20, and the housing 30.

[0028] At the same time, reference should be made to Fig. 1C and Fig. 1D. Fig. 1C is a schematic plan view of the scanning tool holder 1 according to an embodiment of the present disclosure. Fig. Figure 1D is a schematic cross-sectional view along a line AA in Fig. 1C. The tool holder unit 10 can be used to hold a tool (not shown) and includes a base 11 and an auxiliary body 12. A passage 111 is formed in the base 11. The passage 111 passes through the base 11, and a cutting fluid can flow through the passage 111. The auxiliary body 12 is attached to the base 11 by an additive manufacturing process. Specifically, the additive manufacturing process for forming the auxiliary body 12 can be, but is not limited to, a powder bed fusion (PBF) process. In one example, the auxiliary body 12 is a powder bed fusion element. As shown in Fig. 1D, the auxiliary body 12 includes a mounting structure 121 and a channel 122. The auxiliary body 12 is manufactured by the additive manufacturing method such that the mounting structure 121 and the channel 122 are formed together with the auxiliary body 12, the mounting structure 121 and the channel 122 are not formed by a method in which the auxiliary body 12 is destroyed, and thus a degree of control of the dynamic balance can be increased.

[0029] Reference is made to Fig. 2A, which is a schematic three-dimensional representation of the additional body 12 and the scanning unit 20 according to an embodiment of the present disclosure. The mounting structure 121 is formed on an outer surface 12s of the additional body 12. The mounting structure 121 includes a plurality of first mounting recesses 121f and a plurality of second mounting recesses 121s. As shown in Fig. 2C, the number of first mounting recesses 121f is four. The first mounting recesses 121f are arranged in pairs symmetrically to an axis line L of the additional body 12 as a symmetrical axis, so that the angular momentum compensation is increased. As shown in Fig. 2B, the shape of each first mounting recess 121f may generally be a quadrilateral, such as a rectangle.

[0030] Further with reference to Fig. 2A and Fig. 2C, the first mounting recesses 121f and the second mounting recesses 121s are arranged alternately on the outer surface 12s of the additional body 12. In other words, every second mounting recess 121s is located between the adjacent first mounting recesses 121f. In one example, the second mounting recesses 121s are arranged in pairs symmetrically to the axis line L of the additional body 12 as the symmetrical axis, so that the angular momentum balance is increased. An outer contour of every second mounting recess 121s may be polygonal. As further shown in Fig. As shown in Figure 2B, the outer contour of each second mounting recess 121s may be hexagonal or circular, but is not limited thereto. The auxiliary body 12 is formed by the additive manufacturing method, so a hexagon may be selected as the shape of each second mounting recess 121s, which can improve the deformation situation without using additional molding accessories, thereby increasing the manufacturability of the auxiliary body 12. In one example, a plurality of second mounting recesses 121s are provided between the adjacent first mounting recesses 121f and may be arranged at the top and bottom and spaced apart from each other.

[0031] As in Fig. As shown in Figure 2B, the outer contour of each second mounting recess 121s may be hexagonal. When each sensor 24 is installed in the second mounting recess 121s, an installation angle of 90 degrees, 180 degrees, or even 45 degrees can be adopted. Depending on the selected installation angle, the sensor 24 can be used to detect lateral pressure, overpressure, or torque of the tool holder unit 10 and provide real-time data. Further referring to Fig. 2B, the installation angle of the upper sensor 24 is 90 degrees, so that the upper sensor 24 can be used to detect the lateral pressure of the tool holder unit 10 and is suitable for a cutting process. With further reference to Fig. 2B, the installation angle of the lower sensor 24 is 180 degrees, so the lower sensor 24 can be used to detect the overpressure of the tool holder unit 10 and is suitable for a drilling operation. When the installation angle of the sensor 24 is 45 degrees, the sensor 24 can also be used to detect the torque of the tool holder unit 10 and is suitable for a compound machining process. Therefore, users can arrange the sensor 24 in the second mounting recess 121s at various suitable installation angles according to different machining processes. In other words, the second mounting recesses 121s of the mounting structure 121 can increase the installation freedom of the sensor 24 of the scanning unit 20. In one example, the sensor 24 may be an embedded sensor and is installed in the second mounting recess 121s.

[0032] With reference to Fig. 3, Fig. 3 is a schematic side view of an additional body 12' in a scanning tool holder according to another embodiment of the present disclosure. The additional body 12' includes a plurality of fixed portions 12a. In each fixed portion 12a, the fixed portion 12a is located between the adjacent second mounting recesses 121s. The sensor 24' may be a fixed sensor and is attached to the fixed portion 12a. The additional body 12' includes a plurality of air portions AP. In each air portion AP, the air portion AP is located between the channel 122 and the fixed portion 12a, thereby reducing heat conduction to prevent the sensitivity of the fixed sensor from decreasing.For example, when the sensors 24' are fixed sensors and are respectively attached to the fixed portions 12a, an installation angle of 45 degrees and 90 degrees can be adopted to detect lateral pressure, overpressure, or torque of the tool holder unit 10 and provide real-time sensing data. Furthermore, when the sensors are fixed sensors, a distance D4 between the outer surface 12s of the auxiliary body 12' and the air portion AP can be reduced to a minimum of 2 mm to improve the detection effect.

[0033] In one example, the auxiliary body 12' includes a main portion 12m and a frame portion 12f provided around the main portion 12m. The channel 122 is formed through the main portion 12m. The fixed portion 12a is located on the frame portion 12f. The air portion AP is located between the main portion 12m and the frame portion 12f, thereby reducing a contact area between the frame portion 12f and the main portion 12m.

[0034] In one example, the embedded sensor and / or the attached sensor may be incorporated into the additional body 12'. This improves the flexibility in installing the sensors to accommodate individual customization.

[0035] Referring to Fig. 1D, the channel 122 in the auxiliary body 12 is coiled and configured to enlarge a flow path of the cutting fluid in the auxiliary body 12 and fully absorb the heat energy generated by the scanning unit 20. That is, part of the heat energy generated by the scanning unit 20 is conducted to the auxiliary body 12, and then the heat energy absorbed by the auxiliary body 12 is absorbed by the cutting fluid flowing through the channel 122. In other words, the coiled channel 122 can improve the heat dissipation of the scanning unit 20.

[0036] As in Fig. 1D, the channel 122 includes an inlet 122i and an outlet 122o. The inlet 122i is located at an end adjacent to the base 11, and the inlet 122i is in fluid communication with the passage 111 of the base 11. The outlet 122o is located at an end far from the base 11. In one example, a center point of the inlet 122i and a center point of the outlet 122o are each located on the axis line L of the auxiliary body 12. In one example, a diameter 122od of the outlet 122o is smaller than a diameter 122id of the inlet 122i, which can provide a pressure-generating effect, increase the jet throughput at the outlet 122o, and improve the accuracy and efficiency of chip removal. In one example, the diameter 122id of the inlet 122i and the diameter 122od of the outlet 122o are both tapered.That is, a cross section of the inlet 122i is conical, and a cross section of the outlet 122o is conical, so that the pressure generating effect can be gradually increased.

[0037] With reference to Fig. 1D, the additional body 12 is manufactured by the additive manufacturing process, making it possible to produce the generally spiral-shaped channel 122. The channel 122 includes a spiral section 122s. Two ends of the spiral section 122s are connected to the inlet 122i and the outlet 122o, respectively. An inner diameter 122sd of the spiral section 122s is smaller than the diameter 122id of the inlet 122i, and the inner diameter 122sd of the spiral section 122s is larger than the diameter 122od of the outlet 122o.

[0038] In one example, a minimum distance D2 between a center portion 122sm of the spiral portion 122s and the outer surface 12s of the additional body 12 is smaller than a minimum distance D1 between a head portion 122sh of the spiral portion 122s and the outer surface 12s of the additional body 12, and is also smaller than a minimum distance D3 between an end portion 122st of the spiral portion 122s and the outer surface 12s of the additional body 12. Furthermore, the minimum distance D1 between the head portion 122sh of the spiral portion 122s and the outer surface 12s of the additional body 12 may be equal to the minimum distance D3 between the end portion 122st of the spiral portion 122s and the outer surface 12s of the additional body 12, or it may not be equal to the minimum distance D3 between the end portion 122st of the spiral portion 122s and the outer surface 12s of the additional body 12.In other words, the minimum distance D1 between the head portion 122sh of the spiral portion 122s and the outer surface 12s of the additional body 12 may be smaller than, equal to, or larger than the minimum distance D3 between the end portion 122st of the spiral portion 122s and the outer surface 12s of the additional body 12. In addition to being able to adjust a length of the channel 122, the positions at which the channel 122 extends may also be adjusted so that the channel 122 is adjacent to the locations where heat dissipation is required, thereby improving the heat dissipation efficiency.

[0039] In one example, the minimum distance D2 between the center section 122sm of the spiral section 122s and the outer surface 12s of the additional body 12 is equal to the minimum distance D1 between the head section 122sh of the spiral section 122s and the outer surface 12s of the additional body 12, and is also equal to the minimum distance D3 between the end section 122st of the spiral section 122s and the outer surface 12s of the additional body 12. In one example, the minimum distance D2 between the center section 122sm of the spiral section 122s and the outer surface 12s of the additional body 12 is equal to the minimum distance D1 between the head section 122sh of the spiral section 122s and the outer surface 12s of the additional body 12, and is smaller than the minimum distance D3 between the end section 122st of the spiral section 122s and the outer surface 12s of the additional body 12.In one example, the minimum distance D2 between the center portion 122sm of the spiral portion 122s and the outer surface 12s of the additional body 12 is smaller than the minimum distance D1 between the head portion 122sh of the spiral portion 122s and the outer surface 12s of the additional body 12 and is equal to the minimum distance D3 between the end portion 122st of the spiral portion 122s and the outer surface 12s of the additional body 12.

[0040] The head portion 122sh is connected to the inlet 122i. The end portion 122st is connected to the outlet 122o. Two ends of the center portion 122sm are connected to the head portion 122sh and the end portion 122st, respectively. That is, the inlet 122i, the head portion 122sh, the center portion 122sm, the end portion 122st, and the outlet 122o are arranged sequentially.

[0041] As in Fig. As shown in Figure 1D, the scanning unit 20 is arranged on the mounting structure 121 of the additional body 12 and can be used to detect the load on the tool holder unit 10 and the tool during machining. The scanning unit 20 comprises a circuit board 21, a transmitter unit 22, a power supply 23, and the sensors 24 (as shown in Fig. 1B). The circuit board 21 can be arranged in the corresponding first mounting recess 121f. The transmitting unit 22 is provided on the circuit board 21.

[0042] The power supply 23 is provided in the corresponding first mounting recess 121f, and the power supply 23 and the circuit board 21 are opposite each other on both sides of the axis line L of the auxiliary body 12. The power supply 23 is configured to supply the power required by the circuit board 21 and the transmitting unit 22. In one example, the number of power supplies 23 is one, the number of circuit boards 21 is one, and the power supply 23 and the circuit board 21 are opposite each other. In one example, there are three power supplies 23 and one circuit board 21, and these power supplies 23 are spaced apart from each other, and the middle power supply 23 is opposite the circuit board 21.

[0043] The sensor 24 is provided in the corresponding second mounting recess 121s and is electrically connected to the circuit board 21. The sensor 24 can detect and generate a measurement signal when an external force, such as torsion or tension, is applied to the tool holder unit 10. In one example, the sensor 24 can be a piezoelectric material or a pressure sensor.

[0044] The transmitter unit 22 is signal-connected to the circuit board 21 and the sensor 24. Scanning data from the sensor 24 can be transmitted to the circuit board 21. After the circuit board 21 has processed the scanning data, the processed scanning data is transmitted from the transmitter unit 22 to an external control unit. The external control unit also uses the scanning data to determine the machining status of the tool holder unit 10 and adjusts the machining parameters.

[0045] With simultaneous reference to Fig. 1A and Fig.1D, the housing 30 is mounted around the auxiliary body 12 and covers the sensing unit 20. A closed space 40 is formed between the housing 30 and the auxiliary body 12. In other words, the sensing unit 20 is located in the closed space 40. That is, the circuit board 21, the transmitting unit 22, the power supply 23, and the sensor 24 are all located in the closed space 40. In one example, the housing 30 includes a through-hole 33. The through-hole 33 faces the transmitting unit 22, so that the processed sensing data is transmitted from the transmitting unit 22 to the external control device.

[0046] In one example, a first sealing ring 31 is provided between an upper part of the housing 30 and the auxiliary body 12, and a second sealing ring 32 is provided between a lower part of the housing 30 and the auxiliary body 12 to enhance the sealing effect of the closed space 40. During a cutting operation, the housing 30 can protect the scanning unit 20, so that the cutting fluid and chips are not splashed into the closed space 40 and the operation of the scanning unit 20 is not affected. Therefore, the scanning unit 20 is effectively protected, and the service life of the scanning unit 20 is extended by the configuration of the housing 30 and the formation of the closed space 40.

[0047] According to the aforementioned embodiments, the mounting structure of the sensing unit of the present disclosure is formed on the outer surface of the auxiliary body and provides the second mounting recesses. Considering angular momentum compensation and a requirement for the angle for receiving information, the sensor of the sensing unit can be provided in the appropriate second mounting recess. The sensing unit can be provided in the second mounting recesses with different installation angles according to a detection requirement. In other words, the second mounting recesses can not only enable the installation of various sensors but also provide the sensor with different installation angles. Therefore, the installation freedom of the sensor can be effectively increased.

[0048] Second, the channel of the auxiliary body can enlarge the fluid flow path, and a spiral extension section of the channel covers the scanning unit, meaning the channel extends spirally and passes through the auxiliary body. Therefore, when the cutting fluid flows through the channel, the cutting fluid can absorb the thermal energy of the scanning unit and the thermal energy generated during machining, thereby increasing heat dissipation efficiency. The working temperature of the scanning unit can be kept stable and is not affected by long machining times. Therefore, the sensor can operate normally and transmit scanning data stably.

[0049] In addition, the diameter of the outlet of the channel is smaller than the diameter of the inlet, which can provide a pressure-generating effect, increase the jet flow rate at the outlet, and improve the accuracy and efficiency of chip removal, thus increasing the machining quality and service life.

[0050] The housing covers the scanning unit, and the closed space is formed between the housing and the auxiliary body so that the housing can protect the scanning unit, extend the service life of the scanning unit and improve the stability of the scanning unit during monitoring.

Claims

[1] Scanning tool holder (1), comprising: a tool holder unit (10) comprising: a base (11), wherein a passage (111) is formed in the base (11); and an additional body (12) attached to the base (11) by an additive manufacturing process, the additional body (12) comprising: a mounting structure (121) formed on an outer surface (12s) of the additional body (12) and comprising: a plurality of first mounting recesses (121f) arranged in pairs symmetrically to an axis line (L) of the additional body (12) as a symmetrical axis; and a plurality of second mounting recesses (121s) arranged in pairs symmetrically to the axis line (L) of the additional body (12) as a symmetrical axis; a channel (122) which is coiled and formed in the additional body (12), the channel (122) having an inlet (122i) and an outlet (122o), the inlet (122i) communicating with the passage (111), and a diameter of the outlet (122o) being smaller than a diameter of the inlet (122i); a scanning unit (20) arranged on the mounting structure (121); and a housing (30) mounted around the additional body (12) and covering the scanning unit (20), wherein a closed space (40) is formed between the housing (30) and the additional body (12). [2] Scanning tool holder (1) according to claim 1, wherein the additional body (12) is a powder bed melting element. [3] Scanning tool holder (1) according to claim 1, wherein a center point of the inlet (122i) and a center point of the outlet (122o) each lie on the axis line (L) of the additional body (12). [4] Scanning tool holder (1) according to claim 1, wherein the scanning unit (20) comprises: a printed circuit board (21); a transmitting unit (22) provided on the circuit board (21); a power supply (23) configured to supply power required by the circuit board (21) and the transmitting unit (22), wherein the circuit board (21) and the power supply (23) are provided in symmetrical two of the first mounting recesses (121f); and at least one sensor (24), each of the at least one sensor (24) being provided in a corresponding one of the second mounting recesses (121s) and being electrically connected to the circuit board (21); wherein the transmitting unit (22) is signal-connected to the circuit board (21) and each of the at least one sensor (24). [5] The scanning tool holder (1) according to claim 1, wherein an outer contour of each of the second mounting recesses (121s) is polygonal. [6] A scanning tool holder (1) according to claim 5, wherein the outer contour of each of the second mounting recesses (121s) is hexagonal. [7] The scanning tool holder (1) according to claim 1, wherein the channel (122) has a spiral portion (122s), two ends of the spiral portion (122s) are connected to the inlet (122i) and the outlet (122o), respectively, an inner diameter of the spiral portion (122s) is smaller than the diameter of the inlet (122i), and the inner diameter of the spiral portion (122s) is larger than the diameter of the outlet (122o). [8] Scanning tool holder (1) according to claim 7, wherein a minimum distance (D2) between a center portion (122sm) of the spiral portion (122s) and the outer surface (12s) of the additional body (12) is smaller than a minimum distance (D1) between a head portion (122sh) of the spiral portion (122s) and the outer surface (12s) of the additional body (12), and is also smaller than a minimum distance (D3) between an end portion (122st) of the spiral portion (122s) and the outer surface (12s) of the additional body (12). [9] The scanning tool holder (1) according to claim 8, wherein the head portion (122sh) is connected to the inlet (122i), the end portion (122st) is connected to the outlet (122o), and two ends of the middle portion (122sm) are connected to the head portion (122sh) and the end portion (122st), respectively. [10] Scanning tool holder (1) according to claim 7, wherein a minimum distance (D2) between a center portion (122sm) of the spiral portion (122s) and the outer surface (12s) of the additional body (12) is equal to a minimum distance (D1) between a head portion (122sh) of the spiral portion (122s) and the outer surface (12s) of the additional body (12), and is also equal to a minimum distance (D3) between an end portion (122st) of the spiral portion (122s) and the outer surface (12s) of the additional body (12). [11] Scanning tool holder (1) according to claim 7, wherein a minimum distance (D2) between a center portion (122sm) of the spiral portion (122s) and the outer surface (12s) of the additional body (12) is equal to a minimum distance (D1) between a head portion (122sh) of the spiral portion (122s) and the outer surface (12s) of the additional body (12), and is smaller than a minimum distance (D3) between an end portion (122st) of the spiral portion (122s) and the outer surface (12s) of the additional body (12). [12] Scanning tool holder (1) according to claim 7, wherein a minimum distance (D2) between a center portion (122sm) of the spiral portion (122s) and the outer surface (12s) of the additional body (12) is smaller than a minimum distance (D1) between a head portion (122sh) of the spiral portion (122s) and the outer surface (12s) of the additional body (12), and is equal to a minimum distance (D3) between an end portion (122st) of the spiral portion (122s) and the outer surface (12s) of the additional body (12). [13] Scanning tool holder (1) according to claim 4, wherein the housing (30) has a through hole (33) and the through hole (33) faces the transmitting unit (22). [14] Scanning tool holder (1) according to claim 1, wherein the additional body (12) comprises: a plurality of fixed portions (12a) located between the adjacent second mounting recesses (121s); and a plurality of air sections (AP) located between the fixed sections (12a) and the duct (122). [15] Scanning tool holder (1), comprising: a tool holder unit (10) comprising: a base (11), wherein a passage (111) is formed in the base (11); and an additional body (12) attached to the base (11) by an additive manufacturing process, the additional body (12) comprising: a mounting structure (121) formed on an outer surface (12s) of the additional body (12) and comprising: a plurality of first mounting recesses (121f) arranged in pairs symmetrically to an axis line (L) of the additional body (12) as a symmetrical axis; and a plurality of second mounting recesses (121s) arranged in pairs symmetrically to the axis line (L) of the additional body (12) as a symmetrical axis; a channel (122) which is coiled and formed in the additional body (12), the channel (122) having an inlet (122i) and an outlet (122o), the inlet (122i) communicating with the passage (111), and a diameter of the outlet (122o) being smaller than a diameter of the inlet (122i); a scanning unit (20) arranged on the mounting structure (121); a housing (30) mounted around the additional body (12) and covering the scanning unit (20); a first sealing ring (31) provided between an upper part of the housing (30) and the additional body (12); and a second sealing ring (32) provided between a lower part of the housing (30) and the additional body (12).

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