CN113146563B - Hole marking tool and method for marking holes in assemblies - Google Patents

Abstract

The present invention relates to a hole site marking tool and a method of marking hole sites on a fitting. The hole site marking tool includes a hole locator having a locator magnet and a hole marker having a marker magnet and a marker member. The locator magnet includes a locator proximal surface facing the pre-marking surface of the fitting, the locator magnet having a circular shape with a locator central bore through which the pre-marking in the pre-marking surface is visible. The marker magnet includes a marker proximal surface facing the surface to be marked of the mount, the marker magnet having a circular ring shape with a marker central aperture. The marking member includes a proximal end facing the surface to be marked of the fitting and a distal end opposite the proximal end, the marking member being disposed in the marker central bore and axially movable relative to the marker magnet such that the proximal end of the marking member leaves a hole site correspondence mark in the surface to be marked of the fitting at a location corresponding to the reserved mark. The hole site marking tool described above is used in a method of marking hole sites on a fitting.

Description

Hole marking tool and method for marking holes in assemblies

technical field

The present invention relates to a hole position marking tool for marking the hole position of an assembly and a method for marking the hole position on the assembly, in particular to a tool capable of marking the front hole of the assembly to the back of the assembly, An assembly can be a pair of parts or another number of parts. This tool is especially used for the assembly of two parts on an aircraft.

Background technique

When there is an assembly relationship between two or more parts on the aircraft, the drawing generally only shows the fastener hole position information on one of the parts. During actual operation on site, mark the positioning holes on the parts with hole position information according to the drawings. Then mark the hole on another part through other reference planes, lines, etc., and then check whether the hole is too close to the edge of the part or whether the hole is in the chamfering area of the part, and then proceed to the hole making operation after checking.

For part A and part B as shown in Figure 1, after part A and part B are positioned as shown in Figure 1, the margin D of the assembly hole on part A is given on the drawing, and the hole position is drawn according to D , the distance H1 between the hole and the outer bottom edge of part A can be further obtained. If the thickness of the outer wall of the part is h, then the distance H2 between the hole and the inner bottom edge of part A can be calculated through H1-h, and the hole can be drawn according to H2. The projection position on the other side of the assembly, and then get the edge distance d of the hole on part B. If d meets the requirements, the hole can be made.

The above method is suitable for the case where the assembly parts are small, and there are reference planes and lines that can transmit hole positioning information between the assembly parts. There are no reference planes, lines that can project the holes on one side of the assembly to the other side.

As shown in Figure 2, the skin A and skin B have been assembled, and now it is necessary to make holes in the riveting area of the A area shown in the figure. The drawing shows the margin D of the fastener hole on the skin A, And the spacing L of the two rows of fasteners, theoretically, the position of the F row of holes can be marked on the side of the skin B according to the edge line of the skin A and the value of D+L, and then the F row of holes in the skin B can be obtained The margin d on one side, but in fact, because the skin A and skin B have been assembled, forming a single-sided closed state, the edge of skin A cannot be known on the skin B side, so it cannot be realized in the skin B. Marking of row of holes F on side of leather B. When the holes are made without knowing the distance d of the F row of holes on the side of the skin B, once there is an error between the actual and the theoretical overlap W of the skin, it will result in the edge of the F row of holes on the skin B. The distance d cannot be guaranteed. In fact, there are many out-of-tolerance phenomena in the production site.

Contents of the invention

Therefore, in order to solve the above-mentioned technical problems in the prior art, according to one aspect of the present invention, the present invention provides a hole position marking tool for marking the hole position of an assembly, and the assembly includes a reserved mark with a hole position The pre-marked surface of and the surface to be marked of the holes to be marked, wherein the hole marking tool includes a hole locator and a hole marker.

The hole locator includes a locator housing and a locator magnet, the locator magnet is disposed within the locator housing and includes a locator proximal surface facing a pre-marked surface of the assembly, the locator magnet is in the shape of a circle having a central hole of the locator Ring, through the center hole of the locator to allow visualization of reserved marks in pre-marked surfaces.

A hole marker includes a marker housing, a marker magnet, and a marking member. The marker magnet is arranged in the marker housing and includes a marker near surface facing the surface to be marked of the assembly, the marker magnet is in the form of a ring with a marker central hole; the marking member includes a marker to be marked facing the assembly The proximal end of the surface and the distal end opposite to the proximal end, the marking member is arranged in the central hole of the marker and can move axially relative to the marker magnet, so that the proximal end of the marking member can be in the surface to be marked of the assembly, in the corresponding Leave the corresponding mark for the hole position at the position of the reserved mark.

Wherein, the locator magnet and the marker magnet are mutually opposite poles.

Preferably, on the basis of the above technical solution, the hole locator includes an alignment member fixedly connected to the hole locator for aligning the reserved marks of the hole positions.

Preferably, on the basis of the above technical solution, the alignment member includes a plurality of fixedly connected pointers, the plurality of pointers meet at a meeting point, and the meeting point can be aligned with the reserved mark.

Preferably, on the basis of the above technical solution, the multiple pointers include three pointers.

Wherein, the intersection point is set coaxially with the center hole of the locator.

Preferably, on the basis of the above technical solution, the hole marker includes a moving member movably connected to the marker housing, and the moving member axially protrudes from the marker housing toward the surface to be marked of the assembly, so that the moving member Able to move over the surface of the assembly to be marked.

Preferably, on the basis of the above technical solution, the moving member includes three rolling bearings evenly distributed along the circumference of the marker housing, so that the rolling bearings axially protrude from the marker magnet and can move on the surface to be marked of the assembly .

Preferably, on the basis of the above technical solution, the rolling bearing is configured such that a point contact is formed between the hole marker and the surface to be marked of the fitting.

Preferably, on the basis of the above technical solution, the marking member includes a marking piece and a bias spring.

The marker includes a marker head at the proximal end and a button end at the distal end.

The biasing spring is configured to bias the marker towards the distal end such that the marking head is axially retracted into the moving member away from the surface to be marked of the fitting, and when the button end is pressed axially, the marker moves axially towards the proximal end, A portion of the marking head is caused to protrude from the moving member.

Wherein, the marking head of the marking member is arranged coaxially with the central hole of the marking device.

Preferably, on the basis of the above technical solution, the marking head includes a replaceable fiber ink pen nib.

Preferably, on the basis of the above technical solution, the locator housing includes a locator contact wall and a locator handle.

The locator contact wall covers the locator proximal surface of the locator magnet and includes a contact surface capable of conforming to the pre-marked surface of the fitting.

Locator handle for easy handling of the hole locator.

Preferably, on the basis of the above technical solution, the locator magnet further includes a locator far surface opposite to the locator near surface, the alignment member is fixedly connected to the locator magnet or the locator housing, and the intersection point of the alignment member The far surface of the locator is adjacent to the locator magnet.

Preferably, on the basis of the above technical solution, the locator magnet and the marker magnet have the same shape and are made of the same material.

In order to solve the above-mentioned technical problems in the prior art, according to another aspect of the present invention, the present invention also provides a method for marking holes on an assembly using the hole-position marking tool defined in the above-mentioned technical solution, wherein the method includes the following step:

a. Place the hole locator on the pre-marked surface of the assembly with the reserved mark of the hole position, and attach it to the pre-marked surface;

b. Place the hole marker on the surface to be marked of the assembly, under the action of the magnetic force of the locator magnet of the hole locator of the opposite pole and the marker magnet of the hole marker, the hole marker corresponds to the hole locator sticker Fitting onto the surface to be marked of the assembly, the circular ring shape of the locator magnet and the marker magnet aligns the locator magnet and the marker magnet with each other;

c. making the center of the locator center hole of the hole locator correspond to the reserved mark; and

d. Press the marking member of the hole marker axially towards the surface to be marked, so that the marking member moves axially towards the proximal end, and the proximal end of the marking member protrudes from the marker proximal surface of the marker magnet, so that in the surface to be marked, in The position corresponding to the reserved mark leaves the corresponding mark of the hole position.

Preferably, on the basis of the above technical solution, the hole locator includes the alignment member defined in the above technical solution, and the above step c further includes aligning the alignment member with the reserved mark of the hole position.

Preferably, on the basis of the above technical solution, step c occurs before step b.

Preferably, on the basis of the above technical solution, in step c: the hole locator is attached to the pre-marked surface of the assembly and moved, and the hole marker is attached to the surface to be marked of the assembly under the action of the magnetic force. , so that the alignment member aligns with the reserved mark of the hole position.

Description of drawings

Fig. 1 is a schematic diagram of an assembly in the prior art that can locate holes by calculating and marking the back holes;

Fig. 2 is a schematic diagram of an assembly in the prior art where holes cannot be positioned by calculating and marking the back holes;

3 is a three-dimensional exploded schematic diagram of a hole marking tool for marking assembly holes according to the present invention;

Fig. 4 is a three-dimensional schematic diagram of a hole marking tool for marking assembly holes according to the present invention, which shows the appearance structure of a hole locator and a hole marker;

Fig. 5 is the front view of the hole position marking tool for marking the hole position of the assembly part according to the present invention in use state, wherein the assembly part is shown in a cross-sectional view;

Fig. 6 is the same as Fig. 5, which is a schematic diagram of the stress on the back hole marker;

Figure 7 shows an embodiment of the hole marker of the hole marking tool for marking assembly holes shown in Figure 4, showing the rolling ball bearing on the hole marker as the back hole marker ;

Figure 8 shows an embodiment of the hole locator of the hole marking tool for marking the holes of the assembly shown in Figure 4, which shows a schematic diagram of hole positioning when the hole locator is used as the front hole locator;

FIG. 9 is a perspective view of a partial section of the hole marking tool for marking holes of an assembly shown in FIG. 5 , which shows a schematic diagram of marking when the hole marker is used as a back hole marker.

List of reference signs among the figure in technical scheme and embodiment:

1-hole locator, including:

10-Positioner housing, including:

101 - Positioner contacting the wall, having a contact surface,

102-positioner handle,

11- Locator magnet, including:

111-center hole of locator,

11a - locator near surface,

11b - locator far surface,

- Alignment components, including:

12 - pointer;

2-hole marker, including:

20 - Marker housing, comprising:

201 - marker opening,

21 - Marker magnets, including:

211--marker center hole,

21a--marker near surface,

21b--marker far surface,

22 - Marking components, including:

221 - Marking parts, including:

221a - marking head,

221b - button end,

222 - bias spring,

23 - Movement components, including:

23a - Rolling bearings,

23b - Rolling bearings,

23c - Rolling bearings; and

3- Assemblies, including:

31 - Marking surfaces, including reserved markings,

32 - The surface to be marked, including the marks corresponding to the holes.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, so as to more clearly connect the inventive principle and beneficial technical effects of the present invention.

For the convenience of describing the present invention, the terms used herein are explained as follows:

Proximity: Approaching or facing a face or end of an assembly;

Far: The face or end away from or facing away from an assembly;

Front: In the embodiments listed in the specification, the front is the marking surface of the assembly, and in other embodiments, it can also be called the back:

Back side: In the enumerated embodiments, the side opposite to the front side can also be referred to as the front side opposite to the back side in other embodiments.

Figures 3 and 4 show a tool for marking the holes on the back of an assembly part 3 according to the present invention, i.e. a hole marking tool, in this embodiment, comprising: a back hole marker, i.e. a hole marker 2, a front hole The locator, namely the hole locator 1. A strong magnet, i.e. the locator magnet 11, is installed inside the hole locator 1, and another strong magnet, i.e. the marker magnet 21, is installed inside the hole marker 2. The exposed surfaces of the two strong magnets, ie, the locator magnet 11 and the marker magnet 21 after installation are N pole and S pole, or S pole and N pole.

The hole position marking tool according to the present invention is used to mark the hole position of the assembly part 3. In the example shown in Figure 5, the assembly part 3 is a pair of parts to be fastened, and the hole position is not marked in the figure. The hole position is basically at the center of the locator magnet 11 . As shown in FIG. 6 , the assembly part 3 includes a pre-marked surface 31 with holes reserved for marking and a surface 32 to be marked with holes to be marked opposite to the back side of the mark.

As shown in FIG. 4 , the hole marking tool includes a hole locator 1 , a hole marker 2 and an alignment member. The hole locator 1 includes a locator housing 10 and a locator magnet 11 , and the hole marker 2 includes a marker housing 20 , a marker magnet 21 and a marking member 22 .

As shown in FIGS. 8 and 9 , the locator magnet 11 is disposed in the locator housing 10 and includes a locator proximal surface 11 a facing the pre-marked surface 31 of the fitting 3 and a locator proximal surface 11 a opposite, away from the locator. The locator far surface 11b of the pre-marking surface 31 of the assembly part 3, the locator magnet 11 is in the shape of a ring with a locator central hole 111, and the pre-positioning of the hole position in the pre-marking surface 31 can be visualized through the locator central hole 111. Leave a mark. Preferably, the marker housing 10 includes a marker opening 201 facing the back of the assembly part 3 , so that the marker housing 10 is open facing the assembly part 3 , and the marker magnet 21 is accommodated in the marker opening 201 .

The marker magnet 21 arranged in the marker housing 20 includes a marker near surface 21a facing the surface 32 to be marked of the fitting 3 and a marker near surface 21a opposite to the marker near surface 21a, away from the surface 32 to be marked of the fitting 3. On the far surface 21b of the marker, the marker magnet 21 is in the shape of a ring with a central hole 211 of the marker.

The marking member 22 includes a proximal end facing the surface 32 to be marked of the fitting 3 and a distal end opposite to the proximal end. The marking member 22 is arranged in the central hole 211 of the marker and can move axially relative to the marker magnet 21, so that the marking The proximal end of the component 22 can leave a hole position corresponding mark on the surface 32 to be marked of the assembly part 3 at a position corresponding to the reserved mark.

As shown in FIG. 8 , the alignment member is fixedly connected with respect to the hole locator 1 , and is used for aligning the reserved marks on the side of the fitting 3 with the holes. Preferably, the alignment member is fixedly connected to the locator magnet 11 or the locator housing 10 . An example of an alignment means includes a plurality of fixedly connected fingers 12 meeting at a junction adjacent to the locator far surface 11b of the locator magnet 11 and capable of being aligned with the reserved marks. Preferably, the plurality of pointers 12 includes three pointers 12, wherein the intersection point is arranged coaxially with the center hole 111 of the locator. In the example shown in Figure 8, three protruding pointers 12 are designed on the hole locator 1 on the front of the tool, and can be observed through the reserved hole on the hole locator 1 on the front, that is, the center hole of the locator magnet 11. To the position pointed by the three pointers 12, the three pointers 12 are configured as the front hole locator 1. When placed, the three pointers 12 point to the center of the hole position that has been drawn on the front of the assembly part 3, that is, the hole locator 1 on the front part of the tool can be completed positioning.

As shown in FIG. 7 , the hole marker 2 includes a moving member 23 connected to the marker housing 20, and the moving member 23 protrudes axially from the marker housing 20 toward the surface 32 to be marked of the fitting 3, so that the moving member 23 Can be moved on the surface 32 to be marked of the fitting 3 . In the example shown in FIG. 7, the moving member 23 comprises three rolling bearings 23a, 23b, 23c evenly distributed along the circumference of the marker housing 20, so that the rolling bearings 23a, 23b, 23c axially protrude from the marker magnet 21 At least partly so as to be able to roll on the surface 32 to be marked of the fitting 3 . The number of rolling bearings may also be other numbers than three. The moving member 23 can also be replaced with other forms of moving members, for example, sliding members. The moving member 23 may also be an optional member, ie the hole marker 2 is not provided with such a moving member 23 . For the rough surface to be marked 32 of the fitting 3, preferably the rolling bearings 23a, 23b, 23c are configured such that a point contact is formed between the hole marker 2 and the surface to be marked 32 of the fitting 3, for example rolling bearings 23a, 23b, 23c is a ball bearing. And the hole locator 1 on the front of the tool is in surface contact with the assembly part 3 after being attached to the front.

As shown in FIG. 3 , the facing opposite ends of the locator magnet 11 and the marker magnet 21 are opposite to each other, so that the locator magnet 11 and the marker magnet 21 are attracted to each other. In the example shown in Fig. 3, the locator magnet 11 and the marker magnet 21 have the same shape, both are circular and made of the same material.

In the example shown in Figure 6, the locator magnet 11 and the marker magnet 21 respectively installed in the hole locator 1 on the front side of the hole position marking tool and the hole marker 2 on the back side are strong magnets, such as neodymium iron boron, Opposite magnetic poles are opposite. Generally, the magnetic energy product of a strong magnet is about 410KJ/m ³ , and the material density is about 7.5g/cm ³ . The diameter of the strong magnet used in this example is about 8.5mm, and the thickness is about 6.0mm. When the magnetic surface distance is 0, the attractive force F0 generated by the bonding surface is about 280N. With the increase of the distance dn of the strong magnet attraction surface, the attractive force attenuates. The calculation formula is: Fn=F0/dn3. When the hole locator 1 on the front of the hole marking tool and the hole marker 2 on the back are attached to the assembly 3 and left still, the surface friction coefficient is 0.3. According to the calculation, the total thickness Hn of the marked assembly 3 is about Within the range of 130mm, the hole position marking tool can not fall off by the friction force fn greater than its gravity Gn generated by the attractive force on the front and back of the assembly part 3, as shown in FIG. 6 .

Generally need to adopt hole position marking tool of the present invention to mark the assembly part 3 of hole position on the aircraft. The attraction force of the magnet 21 is relatively large. Since the circular strong magnets are neutral when they attract each other, when the hole locator 1 and the hole marker 2 on the front and back sides of the hole marking tool are close to each other on both sides of the assembly part 3, The ball bearings on the hole marker 2 on the back will roll to center the hole locator 1 and hole marker 2 on the front and back. At the same time, after the hole locator 1 on the front side moves, the hole marker 2 on the back will be linked with the hole locator 1 on the front side under the action of the strong magnet attraction of the locator magnet 11 and the marker magnet 21 and the action of the ball bearing, so that The locator magnet 11 and marker magnet 21 are always kept centered.

As shown in FIG. 9 , the marker member 22 includes a marker 221 and a bias spring 222 . The marker 221 includes a marker head 221a at a proximal end and a button end 221b at a distal end. The biasing spring 222 is configured to bias the marker 221 towards the distal end, so that the marking head 221a retracts into the rolling bearings 23a, 23b, 23c in the axial direction and away from the surface 32 to be marked of the fitting 3, when the button end 221b is pressed axially , the marking member 221 moves axially toward the proximal end, so that a part of the marking head 221a protrudes from the rolling ball bearings 23a, 23b, 23c, wherein the marking head 221a of the marking member 22 is coaxially arranged with the central hole 211 of the marking device.

In the example shown in Figure 9, the hole marker 2 on the back is designed with a pressing device, that is, a button end 221b, and the bias spring 222 in the pressing device is in a compressed state, under the action of the spring force of the bias spring 222, The marking head 221a is in a retracted state. As shown in FIG. 5 , the marking head 221a is a replaceable fiber ink pen nib, for example, similar to a common marker pen nib. After the hole marker 2 on the back has been positioned along with the hole locator 1 on the front side, press the button end 221b lightly, as shown in FIG. On the marking surface 32, the marking is completed after leaving marks, and the button end 221b for marking is released after the marking is completed, and the marking head 221a is retracted axially.

As shown in FIG. 9 , the locator housing 10 includes a locator contact wall 101 and a locator handle 102 . The locator contact wall 101 covers the locator proximal surface 11 a of the locator magnet 11 and comprises a contact surface capable of being bonded to the pre-marked surface 31 of the fitting 3 . The locator handle 102 facilitates holding the hole locator 1 .

According to the present invention, there is also provided a method of using the above-mentioned hole marking tool to mark holes on the assembly part 3, the method includes the following steps:

a. Place the hole locator 1 on the pre-marked surface 31 with the reserved mark of the hole position of the assembly part 3, and attach it to the pre-marked surface 31;

b. Place the hole marker 2 on the surface 32 to be marked of the assembly part 3, and under the action of the magnetic force of the locator magnet 11 of the hole locator 1 of different poles and the marker magnet 21 of the hole marker 2, the hole marks The device 2 is attached to the surface 32 to be marked of the assembly part 3 corresponding to the hole locator 1, and the annular shape of the locator magnet 11 and the marker magnet 21 makes the locator magnet 11 and the marker magnet 21 centered on each other;

c. The hole locator 1 is attached to the pre-marked surface 31 of the assembly 3 and moved, and the hole marker 2 is attached to the surface 32 to be marked of the assembly 3 under the action of magnetic force to move, so that the alignment member is aligned with the hole reserved flags for bits; and

d. Press the marking member 22 of the hole marker 2 axially towards the surface 32 to be marked, so that the marking member 22 moves axially towards the proximal end, and the proximal end of the marking member 22 protrudes from the marker proximal surface 21a of the marker magnet 21, so as to On the surface 32 to be marked, mark corresponding to the hole position is left at the position corresponding to the reserved mark.

In the step sequence of the above method, step c can also be operated first, followed by step b.

A specific application of the method of marking holes on the assembly 3 using the hole marking tool in the above example is briefly described as follows:

1) Place the hole locator 1 on the front side of the assembly 3 on the side where the holes are marked according to the drawing, that is, the pre-marked surface 31, and stick it tightly, and place the hole marker 2 on the back on the other side of the assembly 3, That is, the surface 32 to be marked and attached tightly;

2) Move the hole marker 2 on the back to make it close to the hole locator 1 on the front. Under the action of two strong magnets, the hole marker 2 on the back is attracted by the hole locator 1 on the front. After the marker 2 is firmly attached to the surface 32 to be marked of the assembly 3, loosen the fixation of the hole marker 2 on the back;

3) Gently move the hole locator 1 on the front up, down, left, and right to ensure that the hole marker 2 on the back of the other side of the assembly 3 moves flexibly accordingly;

4) Move the hole locator 1 on the front to the marked hole so that the pointer 12 of the hole locator 1 on the front is aligned with the center of the hole;

5) On the other side of the assembly part 3, as shown in Figure 5, lightly press the button on the button end 221b of the hole marker 2 on the back in the direction of the arrow, and the hole corresponding to the front side can be marked on the back of the assembly part 3. hole position.

The above content describes specific implementations of the present invention, but those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, and these changes and modifications all fall within the protection scope of the present invention.

Each feature in the above embodiments can also be combined arbitrarily within a reasonable range according to the principles of the present invention, and such combinations also fall within the protection scope of the present invention.

Claims (16)

1. A hole site marking tool for marking a hole site of a fitting (3), the fitting (3) comprising a pre-marking surface (31) with a pre-marking of the hole site and a surface to be marked (32) to be marked of the hole site, characterized in that the hole site marking tool comprises:

a hole locator (1), the hole locator (1) comprising:

a locator housing (10);

a locator magnet (11), the locator magnet (11) being disposed within the locator housing (10) and comprising a locator proximal surface (11 a) facing the pre-marking surface (31) of the fitting (3), the locator magnet (11) having a circular shape with a locator central aperture (111), the pre-marking in the pre-marking surface (31) being visible through the locator central aperture (111);

a hole marker (2), the hole marker (2) comprising:

a marker housing (20);

a marker magnet (21), the marker magnet (21) being disposed within the marker housing (20) and comprising a marker proximal surface (21 a) facing the surface (32) to be marked of the fitting (3), the marker magnet (21) having a circular ring shape with a marker central aperture (211);

-a marking member (22), the marking member (22) comprising a proximal end facing the surface (32) to be marked of the fitting (3) and a distal end opposite to the proximal end, the marking member (22) being arranged in the marker central bore (211) and being axially movable with respect to the marker magnet (21) such that the proximal end of the marking member (22) is capable of leaving a hole site correspondence mark in the surface (32) to be marked of the fitting (3) in a position corresponding to the reserved mark;

wherein the locator magnet (11) and the marker magnet (21) are heteropolar with respect to each other.

2. The hole site marking tool of claim 1, wherein,

the hole positioner (1) comprises an alignment member fixedly connected relative to the hole positioner (1) for aligning the reserved marks of the hole sites.

3. The hole site marking tool of claim 2, wherein,

the alignment member comprises a plurality of fixedly connected pointers (12), the plurality of pointers (12) meeting at a meeting point, the meeting point being capable of aligning the reservation mark.

4. The hole site marking tool of claim 3, wherein,

the plurality of pointers (12) includes three pointers (12);

wherein the junction is coaxially disposed with the locator central bore (111).

5. The hole site marking tool of claim 3, wherein,

the hole marker (2) comprises a moving member (23) movably connected to the marker housing (20), the moving member (23) axially protruding from the marker housing (20) towards the surface (32) to be marked of the fitting (3) such that the moving member (23) is movable on the surface (32) to be marked of the fitting (3).

6. The hole site marking tool of claim 5, wherein,

the moving member (23) comprises three rolling bearings (23 a,23b,23 c) uniformly distributed along the circumference of the marker housing (20) such that the rolling bearings (23 a,23b,23 c) axially protrude out of the marker magnet and are movable on the surface (32) to be marked of the fitting (3).

7. The hole site marking tool of claim 6, wherein,

the rolling bearings (23 a,23b,23 c) are configured such that a point contact is formed between the bore marker (2) and the surface (32) to be marked of the fitting (3).

8. The hole site marking tool of claim 6, wherein,

the marking member (22) includes:

a marker (221), the marker (221) comprising a marker head (221 a) at the proximal end and a button end (221 b) at the distal end;

-a biasing spring (222), the biasing spring (222) being configured to bias the marker (221) towards the distal end such that the marker head (221 a) is axially retracted into the moving member (23) away from the surface (32) to be marked of the fitting (3), the marker (221) being axially moved towards the proximal end when the button end (221 b) is axially pressed such that a portion of the marker head (221 a) protrudes out of the moving member (23);

wherein the marking head (221 a) of the marking member (22) is coaxially arranged with the marker central hole (211).

9. The hole site marking tool of claim 8, wherein,

the marking head (221 a) comprises a replaceable fiber ink pen nib.

10. The hole site marking tool of claim 9, wherein,

the locator housing (10) comprises:

a locator contact wall (101), the locator contact wall (101) covering the locator proximal surface (11 a) of the locator magnet (11) and comprising a contact surface that is conformable to the pre-marking surface (31) of the fitting (3);

a locator handle (102) for facilitating gripping of the hole locator (1).

11. The hole site marking tool of claim 10, wherein,

the locator magnet (11) further comprises a locator distal surface (11 b) opposite the locator proximal surface (11 a), the alignment member being fixedly connected to the locator magnet (11) or the locator housing (10), the intersection of the alignment member being adjacent the locator distal surface (11 b) of the locator magnet (11).

12. The hole site marking tool of any one of claims 1-11, wherein,

the locator magnet (11) and the marker magnet (21) have the same shape and are made of the same material.

13. A method of marking a hole site on a fitting using a hole site marking tool as claimed in any one of claims 1 to 12, the method comprising the steps of:

a. placing a hole locator (1) on a pre-marking surface (31) of the fitting (3) with a reserved mark of hole sites and attaching to the pre-marking surface (31);

b. -placing a hole marker (2) on a surface (32) to be marked of the fitting (3), the hole marker (2) being attached to the surface (32) to be marked of the fitting (3) in correspondence of the hole marker (1) under the effect of the magnetic forces of a locator magnet (11) of the hole marker (1) and a marker magnet (21) of the hole marker (2) of different poles, the annular shape of the locator magnet (11) and the marker magnet (21) being such that the locator magnet (11) and the marker magnet (21) are centered to each other;

c. such that the center of the locator center hole (111) of the hole locator (1) corresponds to the reservation mark; and

d. pressing the marking member (22) of the hole marker (2) axially towards the surface (32) to be marked such that the marking member (22) is moved axially proximally, the proximal end of the marking member (22) protruding beyond the marker proximal surface (21 a) of the marker magnet (21) to leave a hole site corresponding mark in the surface (32) to be marked at a position corresponding to the reserved mark.

14. A method of marking hole sites on a fitting according to claim 13, characterized in that the hole locator (1) comprises an alignment member according to claim 2,

the step c further comprises:

such that the alignment member is aligned with the preformed indicia of the hole site.

15. The method of marking hole sites on a fitting of claim 14,

said step c occurs before said step b.

16. The method of marking hole sites on a fitting of claim 14,

in said step c:

-moving the hole locator (1) against the pre-marking surface (31) of the fitting (3), the hole marker (2) being moved against the surface (32) to be marked of the fitting (3) under the influence of magnetic force such that the alignment member is aligned with the pre-marking of the hole site.