A fully automatic CNC spraying machine and its spraying process

Abstract

The invention discloses a fully automatic CNC spraying machine and a spraying process thereof, which relate to the field of thermal spraying technology. The machine comprises a base, a mechanical arm is arranged on the top of the base, a water pump is arranged on the outer wall of the mechanical arm, and a surround-type spraying mechanism is arranged on one end of the water pump. By arranging the surround-type spraying mechanism, three rotating blades will rotate on the inner wall of a connecting sleeve through a rotation connection with the inner wall of the connecting sleeve when being toggled, and the rotating blades will drive the rotating shaft to rotate synchronously through a slide groove between the rotating shaft when rotating, and the rotating shaft will drive the sliding sleeve and the arc cover to rotate when rotating, so that the spray liquid sprayed outward through the internal spray holes of the sliding sleeve and the arc cover can be synchronously rotated and sprayed, thereby avoiding the problem of clogging of individual spray holes due to long-term spraying, resulting in uneven spraying to the surroundings, and completing a more uniform and stable annular spraying work by rotation.

Description

Technical Field

[0001] The invention relates to the technical field of thermal spraying, in particular to a full-automatic numerically controlled spraying machine and a spraying process thereof. Background Art

[0002] The sprayer is a special coating equipment that uses spraying technology. The principle is to control the airflow to instantly push the air distribution reversing device to reverse, so that the piston of the pneumatic motor can make a stable and continuous reciprocating motion. The inhaled paint is pressurized and transported to the spray gun of the sprayer through a high-pressure hose. The spray gun instantly atomizes the paint and releases it onto the surface of the object to be coated.

[0003] A fully automatic CNC spraying machine described in the patent application with announcement number CN117431493B relates to the field of plasma spraying and thermal spraying powder and wire, including a spraying covering layer, the outer side of the spraying covering layer is covered with a plurality of covering layer connectors, and the top of the covering layer connector is fixedly connected to a covering layer limit plate; the top of the spraying covering layer is fixedly connected to a connecting cylinder, the outer side of the connecting cylinder is movably connected to a temperature control layer, and the top of the temperature control layer is slidably provided with a guide bracket; the outer side of the guide bracket is provided with a spiral guide layer, and the inner side of the spiral guide layer is provided with a landing groove; the top of the guide bracket is provided with a compressed air bag;

[0004] Currently, when spraying the inside of a cylindrical metal part, the nozzle needs to rotate continuously to achieve uniform spraying in all directions. However, rotary spraying is prone to overlapping spraying at the joints after one rotation, resulting in thicker spraying in this area, affecting the uniformity of spraying on the inner wall of the cylindrical metal part. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a fully automatic CNC spraying machine and a spraying process thereof, which achieves the purpose of solving the above-mentioned problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a fully automatic CNC spraying machine, comprising a base, a mechanical arm is arranged on the top of the base, a water pump is arranged on the outer wall of the mechanical arm, and a surrounding spraying mechanism is arranged at one end of the water pump;

[0007] The surround spraying mechanism comprises:

[0008] A connecting sleeve, the connecting sleeve is a circular cylindrical structure, one end of the connecting sleeve is fixedly connected to one end of the water pump, the inner wall of the connecting sleeve is slidably connected to a sliding sleeve, one end of the sliding sleeve is fixedly connected to an arc cover, the sliding sleeve is a circular cylindrical structure, the sliding sleeve and the inner wall of the arc cover are provided with spray holes, the spray holes are distributed in an annular equidistant array in the inner wall of the arc cover, the interior of the connecting sleeve is connected to the interior of the sliding sleeve, and the connecting sleeve is used to connect the water pump and the sliding sleeve;

[0009] The rotating blade is an inclined plate-like structure, one side of the rotating blade is rotatably connected to the inner wall of the connecting sleeve, the other side of the rotating blade is slidably connected to the rotating shaft through a sliding groove, and one end of the rotating blade is fixedly connected to the inner wall of the arc cover.

[0010] Preferably, a bearing ring is rotatably connected to one side of the sliding sleeve, an outer wall of the bearing ring does not contact an inner wall of the connecting sleeve, and a spring is fixedly connected to one side of the bearing ring.

[0011] Preferably, one end of the spring is fixedly connected to the inner wall of the connecting sleeve, and the slide groove on the outer wall of the rotating shaft is used to enable the rotating blade to slide on the rotating shaft along the direction of the slide groove, but cannot slide radially on the outer wall of the rotating shaft.

[0012] Preferably, the sliding sleeve and the outer wall of the arc-shaped cover are provided with a spray propulsion mechanism, and the spray propulsion mechanism comprises a fixed plate, the outer wall of the fixed plate is fixedly connected to the outer wall of the arc-shaped cover, and the fixed plate is an arc-shaped plate-like structure.

[0013] Preferably, one end of the fixed plate is fixedly connected to a connecting plate, one side of the connecting plate is slidably connected to the outer wall of the connecting sleeve, and one end of the connecting plate is fixedly connected to a rotating ring.

[0014] Preferably, the inner wall of the rotating ring is rotatably connected to the outer wall of the connecting sleeve, and the outer wall of the rotating ring is fixedly connected with blades.

[0015] Preferably, the inner wall of the blade is slidably connected to a sliding plate C, and the inner wall of the blade is fixedly connected to one side of the sliding plate C via a first built-in spring.

[0016] Preferably, the inner wall of the fixed plate is slidably connected to the sliding plate A, the inner wall of the connecting plate is slidably connected to the sliding plate B, the inner wall of the fixed plate is fixedly connected to one side of the sliding plate A through a second built-in spring, and the inner wall of the connecting plate is fixedly connected to one side of the sliding plate B through a third built-in spring.

[0017] A fully automatic CNC spraying process comprises the following steps:

[0018] S1: Start the robot arm to move the water pump and the connecting sleeve to the cylindrical metal part to be sprayed, then start the water pump to pass the external spraying liquid into the connecting sleeve, and then enter the sliding sleeve and the arc cover through the connecting sleeve;

[0019] S2: The spraying liquid is then sprayed out through the spraying holes, thereby completing the uniform spraying work on the inner wall of the cylindrical metal part. The spraying of the inner wall of the cylindrical metal part is achieved by using the spraying holes opened in all directions.

[0020] The present invention provides a fully automatic CNC spraying machine and a spraying process thereof, which have the following beneficial effects:

[0021] 1. The present invention sets a surrounding spraying mechanism, which enters into the sliding sleeve and the arc cover through the connecting sleeve, and sprays out through the spray holes outside the arc cover, thereby completing the uniform spraying of the inner wall of the cylindrical metal part. The spray holes opened in all directions are used to achieve dead-angle spraying of the inner wall of the cylindrical metal part, and effectively avoids the problem of uneven superposition of the spray liquid at the annular spray joint.

[0022] 2. The present invention sets a surround spraying mechanism. When the three rotating blades are moved, they will rotate on the inner wall of the connecting sleeve through the rotation connection with the inner wall of the connecting sleeve. When the rotating blades rotate, they drive the rotating shaft to rotate synchronously through the slide grooves between the rotating shaft. When the rotating shaft rotates, it drives the sliding sleeve and the arc cover to rotate, so that the spray liquid sprayed outward through the internal spray holes of the sliding sleeve and the arc cover can be rotated and sprayed synchronously, thereby avoiding the problem of uneven spraying to the surrounding caused by clogging of individual spray holes due to long-term spraying. By utilizing rotation, a more uniform and stable annular spraying work can be completed.

[0023] 3. The present invention provides a surround spraying mechanism, so that as the spraying pressure increases and the spring deforms, the sliding sleeve and the arc cover will automatically extend outward, so that a large number of spray holes on the outer wall of the sliding sleeve are separated from the inner wall of the connecting sleeve as much as possible, so that the surrounding spraying can be completed through more surround spray holes. It can not only realize automatic increase of the spraying area under high-pressure rapid spraying to adapt to the spraying work in a larger metal cylinder and ensure work efficiency, but also avoid the problem that the atomized spray liquid at the spray hole is converted into a columnar spray due to excessive pressure in the connecting sleeve, the sliding sleeve and the arc cover, and reduce the inner wall material of the connecting sleeve, the sliding sleeve and the arc cover being damaged and sprayed out due to excessive pressure, causing spraying quality problems in the sprayed metal cylinder.

[0024] 4. The present invention sets a spray propulsion mechanism, under different spraying pressures, can achieve different degrees of effect of the fixed plate and the sliding plate C moving the air. When it is necessary to spray larger and deeper cylindrical metal parts, the spraying pressure can be increased to achieve circumferential spraying while quickly diffusing deep into the metal cylinder. Then, metal cylinders and metal tubes of certain depths can be evenly sprayed, and the problem of being unable to spray in a circular shape due to the inability to reach deep parts will not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 The structure of the surrounding spraying mechanism of the present invention is shown in FIG. Figure 1 ;

[0027] Figure 3 The structure of the surrounding spraying mechanism of the present invention is shown in FIG. Figure 2 ;

[0028] Figure 4 It is a cross-sectional structural schematic diagram of the surrounding spraying mechanism of the present invention;

[0029] Figure 5 It is a state diagram of the surrounding spraying mechanism of the present invention when it rotates;

[0030] Figure 6 For the present invention Figure 3 A magnified image of point A;

[0031] Figure 7 For the present invention Figure 4 The enlarged view of point B;

[0032] Figure 8 It is a schematic diagram of the cross-sectional structure of the sliding sleeve of the present invention;

[0033] Fig. 9 The motion state of the surrounding spraying mechanism of the present invention is shown in FIG. Figure 1 ;

[0034] Fig.10 The motion state of the surrounding spraying mechanism of the present invention is shown in FIG. Figure 2 ;

[0035] Fig.11 It is a cross-sectional structural schematic diagram of the spray propulsion mechanism of the present invention;

[0036] Fig.12 It is a structural schematic diagram of the spray propulsion mechanism of the present invention;

[0037] Fig.13 It is a schematic diagram of the motion state of the spray propulsion mechanism of the present invention.

[0038] In the figure: 1 base, 2 mechanical arm, 3 surround spray mechanism, 301 connecting sleeve, 302 sliding sleeve, 303 arc cover, 304 spray hole, 305 bearing ring, 306 spring, 307 rotating blade, 308 rotating shaft, 4 spray propulsion mechanism, 401 fixed plate, 402 connecting plate, 403 rotating ring, 404 blade, 405 sliding plate A, 406 sliding plate B, 407 sliding plate C, 5 water pump. DETAILED DESCRIPTION

[0039] Example 1: Please refer to Figure 1-4 The present invention provides a technical solution: a fully automatic CNC spraying machine, comprising a base 1, a mechanical arm 2 is arranged on the top of the base 1, a water pump 5 is arranged on the outer wall of the mechanical arm 2, and a surrounding spraying mechanism 3 is arranged at one end of the water pump 5;

[0040] The surrounding spraying mechanism 3 comprises:

[0041] A connecting sleeve 301 is a circular cylindrical structure. One end of the connecting sleeve 301 is fixedly connected to one end of the water pump 5. A sliding sleeve 302 is slidably connected to the inner wall of the connecting sleeve 301. One end of the sliding sleeve 302 is fixedly connected to an arc cover 303. The sliding sleeve 302 is a circular cylindrical structure. Spray holes 304 are provided on the inner walls of the sliding sleeve 302 and the arc cover 303. The spray holes 304 are distributed in an annular equidistant array on the inner wall of the arc cover 303. The interior of the connecting sleeve 301 is connected to the interior of the sliding sleeve 302. The connecting sleeve 301 is used to connect the water pump 5 with the sliding sleeve 302.

[0042] The rotating blade 307 is an inclined plate-shaped structure. One side of the rotating blade 307 is rotatably connected to the inner wall of the connecting sleeve 301. The other side of the rotating blade 307 is slidably connected to the rotating shaft 308 through a slide groove. One end of the rotating blade 307 is fixedly connected to the inner wall of the arc cover 303. When in use, the mechanical arm 2 is started to move the water pump 5 and the connecting sleeve 301 to the cylindrical metal part that needs to be sprayed, and then the water pump 5 is started to pass the external spraying liquid into the inside of the connecting sleeve 301, and then enters the sliding sleeve 302 and the arc cover 303 through the connecting sleeve 301, and is sprayed out through the spraying holes 304 outside the arc cover 303, thereby completing the uniform spraying of the inner wall of the cylindrical metal part, and utilizing the spraying holes 304 opened in all directions to achieve dead-angle spraying of the inner wall of the cylindrical metal part, and effectively avoiding the problem of uneven superposition of the spraying liquid at the annular spraying joint;

[0043] Example 2: Please refer to Figure 1-10 On the basis of the first embodiment, the present invention provides a technical solution: a bearing ring 305 is rotatably connected to one side of the sliding sleeve 302, the outer wall of the bearing ring 305 does not contact the inner wall of the connecting sleeve 301, and a spring 306 is fixedly connected to one side of the bearing ring 305.

[0044] One end of the spring 306 is fixedly connected to the inner wall of the connecting sleeve 301, and the sliding groove on the outer wall of the rotating shaft 308 is used to make the rotating blade 307 slide along the sliding groove direction on the rotating shaft 308, but cannot slide radially on the outer wall of the rotating shaft 308;

[0045] When the spraying liquid flows through the inner wall of the connecting sleeve 301 to the sliding sleeve 302, it will first pass through the rotating blades 307 on the inner wall of the connecting sleeve 301. When the liquid flows and contacts the rotating blades 307, a forward force will be generated on the rotating blades 307. When the inclined blades are subjected to a force exerted on them by the liquid, since the rotating blades 307 are inclined surfaces and inclined settings, the rotating blades 307 will also exert an equal but opposite force on the liquid. This reaction force is the power source for the rotation of the rotating blades 307. Therefore, when the three rotating blades 307 are moved, they will rotate on the inner wall of the connecting sleeve 301 through the rotation connection with the inner wall of the connecting sleeve 301. When the rotating blades 307 rotate, The sliding groove between the sliding sleeve 302 and the rotating shaft 308 drives the rotating shaft 308 to rotate synchronously. When the rotating shaft 308 rotates, the sliding sleeve 302 and the arc cover 303 are driven to rotate. Since the sliding sleeve 302 is rotatably connected with the spring 306 through the bearing ring 305, the rotation of the sliding sleeve 302 will not cause the spring 306 to twist, and the spring 306 only plays the role of elastic expansion and contraction, and the spraying liquid sprayed outward through the internal spraying holes 304 of the sliding sleeve 302 and the arc cover 303 can be synchronously rotated and sprayed, thereby avoiding the problem of clogging of individual spraying holes 304 due to long-term spraying, resulting in uneven spraying to the surroundings, and using rotation to complete a more uniform and stable annular spraying work;

[0046] The spraying liquid is sprayed at high pressure. Under the high pressure spraying state, the flow rate is fast and the pressure is high, which can drive the rotating blade 307 to rotate, and drive the light rotating shaft 308 and the sliding sleeve 302 to rotate together. While realizing the rotary spraying, there is no need to set up extra motors and transmission components to control its rotation, which not only saves costs and resources, but also prevents the long-term high humidity at the nozzle, which leads to the occurrence of accidents caused by setting up too many electrical appliances.

[0047] When the water pump 5 controls the spraying pressure, the spraying force can be adjusted automatically. When the spraying pressure is high, the pressure inside the connecting sleeve 301, the sliding sleeve 302 and the arc cover 303 increases, thereby pushing the sliding sleeve 302 to slide out in the inner wall of the connecting sleeve 301, and the sliding sleeve 302 pulls the spring 306 through the bearing ring 305, so that the spring 306 is deformed. As the pressure increases, the degree of deformation of the spring 306 increases, so that as the spraying pressure increases and the spring 306 deforms, the sliding sleeve 302 and the arc cover 303 automatically extend outward, so that a large number of spray holes 304 on the outer wall of the sliding sleeve 302 can be as large as possible. It can be separated from the inner wall of the connecting sleeve 301, so that the surrounding spraying can be completed through more surrounding spray holes 304, which can not only realize the automatic increase of the spraying area under high-pressure rapid spraying to adapt to the spraying work in a larger metal cylinder, while ensuring the work efficiency, but also avoid the problem that the atomized spray liquid at the spray hole 304 is transformed into a columnar spray due to excessive pressure in the connecting sleeve 301, the sliding sleeve 302, and the arc cover 303, and reduce the inner wall material of the connecting sleeve 301, the sliding sleeve 302, and the arc cover 303. The inner wall material is damaged and sprayed out due to excessive pressure, which causes the spraying quality problem in the sprayed metal cylinder;

[0048] Example 3: Please refer to Figure 1-13 On the basis of Embodiment 1 and Embodiment 2, the present invention provides a technical solution: a spray propulsion mechanism 4 is provided on the outer wall of the sliding sleeve 302 and the arc cover 303, and the spray propulsion mechanism 4 includes a fixed plate 401, and the outer wall of the fixed plate 401 is fixedly connected to the outer wall of the arc cover 303, and the fixed plate 401 is an arc-shaped plate-like structure.

[0049] One end of the fixed plate 401 is fixedly connected to a connecting plate 402 , one side of the connecting plate 402 is slidably connected to the outer wall of the connecting sleeve 301 , and one end of the connecting plate 402 is fixedly connected to a rotating ring 403 .

[0050] The inner wall of the rotating ring 403 is rotatably connected to the outer wall of the connecting sleeve 301 , and the outer wall of the rotating ring 403 is fixedly connected with the blade 404 .

[0051] The inner wall of the blade 404 is slidably connected to a sliding plate C407 , and the inner wall of the blade 404 is fixedly connected to one side of the sliding plate C407 via a first built-in spring.

[0052] The inner wall of the fixed plate 401 is slidably connected to a sliding plate A405, the inner wall of the connecting plate 402 is slidably connected to a sliding plate B406, the inner wall of the fixed plate 401 is fixedly connected to one side of the sliding plate A405 via a second built-in spring, and the inner wall of the connecting plate 402 is fixedly connected to one side of the sliding plate B406 via a third built-in spring;

[0053] When the arc cover 303 rotates, it will synchronously drive the fixed plate 401 and the connecting plate 402 of the outer wall to rotate, the connecting plate 402 drives the rotating ring 403 to rotate, and the rotating ring 403 drives the blades 404 to rotate. The rotation of the blades 404 can move the air to flow toward the arc cover 303, so that the spray liquid sprayed out through the spray hole 304 can maintain the circular outward spraying and flow forward evenly, ensuring its circular forward spraying work;

[0054] When the spraying pressure increases, the speed at which the rotating blade 307 is driven to rotate increases, and the rotation speeds of the blade 404 and the connecting plate 402 also increase. When the blade 404 rotates quickly, the sliding plate C407 overcomes the first built-in spring on the inner wall of the blade 404 and slides outward, and the sliding plate A405 and the sliding plate B406 also overcome the second built-in spring and the third built-in spring inside the fixed plate 401 and the connecting plate 402 and slide outward. Under the spraying of different pressures, the fixed plate 401 and the sliding plate C407 can achieve different degrees of air-moving effects. When it is necessary to spray larger and deeper cylindrical metal parts, the spraying pressure can be increased to achieve circumferential spraying while quickly diffusing into the depths of the metal cylinder. Then, metal cylinders and metal pipes of certain depths can be evenly sprayed, and the problem of being unable to spray in a circular manner due to the inability to reach deep areas will not occur.

[0055] A fully automatic CNC spraying process comprises the following steps:

[0056] S1: Start the robot arm 2 to move the water pump 5 and the connecting sleeve 301 to the cylindrical metal part to be sprayed, then start the water pump 5 to pass the external spraying liquid into the connecting sleeve 301, and then enter the sliding sleeve 302 and the arc cover 303 through the connecting sleeve 301;

[0057] S2: The spraying liquid is then sprayed out through the spraying holes 304, thereby completing the uniform spraying work on the inner wall of the cylindrical metal part. The spraying holes 304 opened in all directions are used to spray the inner wall of the cylindrical metal part.

[0058] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fully automatic CNC spraying machine, comprising a base (1), a mechanical arm (2) being arranged on the top of the base (1), and a water pump (5) being arranged on the outer wall of the mechanical arm (2), characterized in that: A surrounding spraying mechanism (3) is provided at one end of the water pump (5); The surround spraying mechanism (3) comprises: A connecting sleeve (301), the connecting sleeve (301) being a circular cylindrical structure, one end of the connecting sleeve (301) being fixedly connected to one end of a water pump (5), a sliding sleeve (302) being slidably connected to the inner wall of the connecting sleeve (301), one end of the sliding sleeve (302) being fixedly connected to an arc-shaped cover (303), the sliding sleeve (302) being a circular cylindrical structure, the inner walls of the sliding sleeve (302) and the arc-shaped cover (303) being provided with spray holes (304), the spray holes (304) being distributed in an annular equidistant array in the inner wall of the arc-shaped cover (303), the interior of the connecting sleeve (301) being connected to the interior of the sliding sleeve (302), and the connecting sleeve (301) being used to connect the water pump (5) with the sliding sleeve (302); A rotating blade (307), wherein the rotating blade (307) is an inclined plate-shaped structure, one side of the rotating blade (307) is rotatably connected to the inner wall of the connecting sleeve (301), the other side of the rotating blade (307) is slidably connected to a rotating shaft (308) via a sliding groove, and one end of the rotating blade (307) is fixedly connected to the inner wall of the arc-shaped cover (303); A bearing ring (305) is rotatably connected to one side of the sliding sleeve (302); an outer wall of the bearing ring (305) does not contact an inner wall of the connecting sleeve (301); and a spring (306) is fixedly connected to one side of the bearing ring (305).

2. A fully automatic CNC spraying machine according to claim 1, characterized in that: One end of the spring (306) is fixedly connected to the inner wall of the connecting sleeve (301), and the sliding groove on the outer wall of the rotating shaft (308) is used to enable the rotating blade (307) to slide on the rotating shaft (308) along the direction of the sliding groove, but cannot slide radially on the outer wall of the rotating shaft (308).

3. A fully automatic CNC spraying machine according to claim 2, characterized in that: The sliding sleeve (302) and the outer wall of the arc-shaped cover (303) are provided with a spraying propulsion mechanism (4), and the spraying propulsion mechanism (4) comprises a fixing plate (401), the outer wall of the fixing plate (401) is fixedly connected to the outer wall of the arc-shaped cover (303), and the fixing plate (401) is an arc-shaped plate-shaped structure.

4. A fully automatic CNC spraying machine according to claim 3, characterized in that: One end of the fixed plate (401) is fixedly connected to a connecting plate (402), one side of the connecting plate (402) is slidably connected to the outer wall of the connecting sleeve (301), and one end of the connecting plate (402) is fixedly connected to a rotating ring (403).

5. A fully automatic CNC spraying machine according to claim 4, characterized in that: The inner wall of the rotating ring (403) is rotatably connected to the outer wall of the connecting sleeve (301), and the outer wall of the rotating ring (403) is fixedly connected with a blade (404).

6. A fully automatic CNC spraying machine according to claim 5, characterized in that: The inner wall of the blade (404) is slidably connected to a sliding plate C (407), and the inner wall of the blade (404) is fixedly connected to one side of the sliding plate C (407) via a first built-in spring.

7. A fully automatic CNC spraying machine according to claim 6, characterized in that: The inner wall of the fixed plate (401) is slidably connected to a sliding plate A (405), and the inner wall of the connecting plate (402) is slidably connected to a sliding plate B (406). The inner wall of the fixed plate (401) is fixedly connected to one side of the sliding plate A (405) via a second built-in spring, and the inner wall of the connecting plate (402) is fixedly connected to one side of the sliding plate B (406) via a third built-in spring.

8. A fully automatic CNC spraying process, based on a fully automatic CNC spraying machine according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: starting the mechanical arm (2) to move the water pump (5) and the connecting sleeve (301) to the inside of the cylindrical metal part to be sprayed, then starting the water pump (5) to allow the external spraying liquid to pass into the inside of the connecting sleeve (301), and then into the sliding sleeve (302) and the arc cover (303) through the connecting sleeve (301); S2: The spraying liquid is then sprayed out through the spraying holes (304), thereby completing the uniform spraying work on the inner wall of the cylindrical metal part. The spraying holes (304) opened in all directions are used to spray the inner wall of the cylindrical metal part.

Images