Cutter pressure control mechanism and machining equipment

Abstract

The utility model discloses a cutter pressure control mechanism and machining equipment. The cutter pressure control mechanism comprises a support, a driving assembly, a moving assembly and a first elastic assembly. The driving assembly is movably arranged on the support; the moving assembly is movably arranged on the support and is in driving connection with the driving assembly; the moving assembly is used for installing the tool module and can drive the tool module to move towards the workpiece. The first elastic assembly is connected between the driving assembly and the moving assembly and used for adjusting the pressure of the moving assembly driving the tool module to the workpiece. According to the technical scheme, the precision of cutter pressure control can be improved, the machining requirements of workpieces made of different materials or with different thicknesses are met, and the machining effect of the workpieces is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to processing technical field, especially a kind of knife pressure control mechanism and processing equipment. BACKGROUND

[0002] With the development of manufacturing industry, processing equipment has been widely applied in production plant.

[0003] Processing equipment is driven by movement module to feed cutter to process, in the processing process, the pressure of cutter to workpiece is one of important influencing factors of processing effect, if pressure is too large, workpiece surface can be damaged, if pressure is too small, processing efficiency and processing accuracy will be affected.

[0004] In related art, processing equipment uses electromagnet to control the pressure of cutter to workpiece, however, the precision of pressure control is poor, and it cannot meet the processing needs of different materials or different thickness workpieces. UTILITY MODEL CONTENT

[0005] The main purpose of the utility model is to provide a kind of knife pressure control mechanism, to improve the precision of knife pressure control, meet the processing needs of different materials or different thickness workpieces, improve the processing effect of workpiece.

[0006] To achieve the above-mentioned purpose, the knife pressure control mechanism provided by the utility model comprises:

[0007] Support;

[0008] Driving assembly, movably arranged on the support;

[0009] Moving assembly, movably arranged on the support, and drivingly connected with the driving assembly; the moving assembly is used for installing cutter module, and can drive the cutter module to move towards workpiece; and

[0010] First elastic component, connected between the driving assembly and the moving assembly, for adjusting the pressure of the moving assembly driving the cutter module to workpiece.

[0011] In an embodiment of the present application, the first elastic component is arranged on the side of the driving assembly close to the cutter module, and the driving assembly can compress the first elastic component to drive the moving assembly to move towards workpiece;

[0012] In the direction of the driving assembly compressing the first elastic component, the elastic coefficient of the first elastic component increases in a segmented manner.

[0013] In an embodiment of the present application, the first elastic assembly comprises at least a first spring and a second spring arranged in a spaced manner, the free length of the first spring is greater than that of the second spring, and the elastic coefficient of the first spring is less than that of the second spring.

[0014] In an embodiment of the present application, one end of the first spring and the second spring is connected with the moving assembly, and the other end of the first spring and the second spring extends freely towards the driving assembly.

[0015] In an embodiment of the present application, the moving assembly is capable of lifting and lowering relative to the support, thereby driving the cutter module to lift and lower.

[0016] In an embodiment of the present application, the moving assembly comprises:

[0017] a moving member in sliding connection with the support, the lower end of the moving member being connected with the cutter module;

[0018] a first mounting portion arranged on one side of the moving member and below the driving assembly, the first elastic assembly being arranged between the first mounting portion and the driving assembly; and

[0019] a second mounting portion arranged on one side of the moving member and above the first mounting portion in a spaced manner, at least part of the driving assembly being located between the first elastic assembly and the second mounting portion for driving the moving member to lift and lower.

[0020] In an embodiment of the present application, the knife pressure control mechanism further comprises a second elastic assembly connected between the second mounting portion and the driving assembly.

[0021] In an embodiment of the present application, the driving assembly comprises:

[0022] a lead screw fixedly arranged on the support;

[0023] a motor sleeved on the lead screw and capable of rotating along the lead screw; and

[0024] a motor fixing member arranged on one end of the motor and in sliding cooperation with the moving assembly, the first elastic assembly being clamped between the motor fixing member and the moving assembly.

[0025] In an embodiment of the present application, the support comprises two fixed plates arranged in a spaced and opposite manner and a side plate supporting and connecting the two fixed plates, the driving assembly being arranged between the two fixed plates;

[0026] a guide column arranged between the two fixed plates, the moving assembly being in sliding cooperation with the guide column.

[0027] To achieve the above object, the application further provides a processing equipment, comprising:

[0028] a host computer;

[0029] a tool module; and

[0030] The tool pressing control mechanism described above, the support is connected with the host computer, and the tool module is connected with the moving assembly.

[0031] In the tool pressing control mechanism, the driving assembly is movably arranged on the support, and the moving assembly is drivingly connected with the driving assembly, so that the tool module can be driven to move towards the workpiece. The first elastic assembly is connected between the moving assembly and the driving assembly, so that the driving assembly can drive the moving assembly to move through the first elastic assembly, thereby adjusting the downward pressure of the tool module on the workpiece, achieving more precise control of the tool pressure, meeting the processing requirements of different materials or different thickness workpieces, and achieving better processing effect. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description.

[0033] Figure 1 The figure is a schematic view of the cooperation structure of the tool pressing control mechanism and the tool module of the present application.

[0034] Figure 2 The figure is a schematic view of the structure of an embodiment of the tool pressing control mechanism of the present application.

[0035] Figure 3 The figure is a sectional view of the tool pressing control mechanism of the present application.

[0036] Explanation of reference numerals:

[0037] Reference Name Reference Name 310 Knife pressing control mechanism 313 Moving assembly 311 Support 3131 Moving piece 3111 Fixed plate 3132 First mounting portion 3112 Side plate 3133 Second mounting portion 3113 Guide column 314 First elastic assembly 312 Driving assembly 3141 First spring 3121 Lead screw 3142 Second spring 3122 Motor 315 Second elastic assembly 3123 Motor fixing piece 320 Tool module

[0038] The realization, functional characteristics and advantages of the present application will be further described with reference to the drawings. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present utility model.

[0040] It should be noted that if the embodiments of the present utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0041] Meanwhile, "and / or" or "and / or" appearing throughout the text means that three solutions are included, taking "A and / or B" as an example, including A solution, or B solution, or A and B solutions.

[0042] In addition, if the embodiments of the present utility model involve "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] The utility model provides a kind of knife pressure control mechanism 310, it is applied to processing equipment, for controlling the pressure of tool module 320 to workpiece when processing, satisfy the processing demand of different materials or different thickness workpiece, reach better processing effect.It can be understood that the above processing equipment is not limited to a certain specific type of processing equipment, such as can be laser processing equipment, machine tool or machining center etc..The type of tool module 320 controlled by knife pressure control mechanism 310 is not limited to a certain specific type of tool module, such as can be needle knife, turning tool, hob or other types of tool etc..The specific structure of knife pressure control mechanism 310 is described below.

[0044] In the embodiments of the present utility model, as shown in the drawings, Figures 1 to 3 The knife pressure control mechanism 310 includes support 311, drive assembly 312, moving assembly 313 and first elastic assembly 314.

[0045] The driving assembly 312 is movably arranged on the support 311; the moving assembly 313 is movably arranged on the support 311 and drivingly connected with the driving assembly 312; the moving assembly 313 is used for mounting the tool module 320 and can drive the tool module 320 to move towards the workpiece; the first elastic assembly 314 is connected between the driving assembly 312 and the moving assembly 313, so as to adjust the pressure of the tool module 320 on the workpiece.

[0046] In the embodiment, the support 311 serves to support the driving assembly 312, the moving assembly 313 and the first elastic assembly 314. The tool module 320 is fixedly connected to the moving assembly 313, and the driving assembly 312 can move relative to the support 311 to drive the moving assembly 313 to move the tool module 320 towards the workpiece, so as to realize the machining function of the workpiece. It can be understood that when the tool module 320 machines the workpiece, the tool module 320 will generate a certain downward pressure on the machined surface of the workpiece. The pressure of the tool module 320 on the workpiece can be adjusted by the tool pressure control mechanism 310. The first elastic assembly 314 is arranged between the driving assembly 312 and the moving assembly 313, so that the power transmission between the driving assembly 312 and the moving assembly 313 is adjusted by the first elastic assembly 314. The driving assembly 312 compresses or stretches the first elastic assembly 314, and the first elastic assembly 314 transmits the elastic force to the moving assembly 313 to drive the moving assembly 313 to drive the tool module 320 to press the workpiece. Thus, based on the elastic coefficient of the first elastic assembly 314 and the deformation length of the driving assembly 312 compressing or stretching the first elastic assembly 314, more accurate control of the tool pressure can be realized, so that the tool module 320 has a suitable pressure to machine the workpiece and meets the machining requirements of workpieces of different materials or different thicknesses.

[0047] It should be noted that the moving direction of the moving assembly 313 in the embodiment is not limited to a certain direction, for example, it can be the upward and downward direction, the horizontal direction or the inclined direction, etc. The specific direction can be determined according to the machining direction of the tool module 320 on the workpiece. For the sake of understanding, the moving assembly 313 is taken as an example to move in the upward and downward direction (e.g. the Z direction in the figure) in the following description. The driving assembly 312 moves upward and downward relative to the support 311 to compress or stretch the first elastic assembly 314, and the first elastic assembly 314 drives the moving assembly 313 to move to adjust the downward pressure of the tool module 320 on the workpiece.

[0048] The specific structure of the driving assembly 312 can be determined according to the actual situation, for example, it can be a motor and a screw rod cooperating to realize upward and downward movement, or a cylinder driving upward and downward movement, or an electric cylinder driving structure realizing upward and downward movement, etc. The specific structure is not limited here.

[0049] The specific structure of the moving assembly 313 can be determined according to actual conditions, for example, can be a slider structure, a sliding frame structure or other special-shaped structures, etc., and the specific structure is not limited herein. Optionally, the cutter module 320 can be installed with the moving assembly 313 through screwing or buckling connection or the like.

[0050] In the cutter pressure control mechanism 310, the driving assembly 312 is movably arranged on the support 311, and the moving assembly 313 is drivingly connected with the driving assembly 312, so as to drive the cutter module 320 to move towards the workpiece. The first elastic assembly 314 is connected between the moving assembly 313 and the driving assembly 312, so that the driving assembly 312 can drive the moving assembly 313 to move through the first elastic assembly 314, and then the downward pressure of the cutter module 320 on the workpiece is adjusted, the control of the cutter pressure is more accurate, the processing requirements of different materials or different thickness workpieces are met, and better processing effect is achieved.

[0051] In an embodiment of the present application, as shown in Figure 2 and Figure 3 , the first elastic assembly 314 is arranged on one side of the driving assembly 312 close to the cutter module 320, the driving assembly 312 can compress the first elastic assembly 314 to drive the moving assembly 313 to move towards the workpiece; in the direction in which the driving assembly 312 compresses the first elastic assembly 314, the elastic coefficient of the first elastic assembly 314 is segmentedly increased.

[0052] It can be understood that the first elastic assembly 314 is located below the driving assembly 312, and the downward movement of the driving assembly 312 can compress the first elastic assembly 314, and the first elastic assembly 314 can generate downward pressure on the moving assembly 313 after being compressed, and then drive the cutter module 320 to press downwards on the workpiece.

[0053] In the embodiment, the elastic coefficient of the first elastic assembly 314 increases in a segmented manner in the direction in which the driving assembly 312 compresses the first elastic assembly 314. It can be understood that when the driving assembly 312 starts to move downward by a distance, the downward pressure acting on the moving assembly 313 and the tool module 320 is small due to the small elastic coefficient of the first elastic assembly 314, and at this time, the workpiece processing with a small tool pressure requirement, such as a thin or soft workpiece, is adapted. When the driving assembly 312 continues to move downward by a distance, the elastic coefficient of the first elastic assembly 314 increases, and the downward pressure acting on the moving assembly 313 and the tool module 320 increases, and at this time, the workpiece processing with a large tool pressure requirement, such as a thick or hard workpiece, is adapted. When a workpiece with a larger tool pressure requirement needs to be processed, the driving assembly 312 can continue to move downward to correspond to the larger elastic coefficient of the first elastic assembly 314, so that the downward pressure acting on the moving assembly 313 and the tool module 320 is larger. In this way, the tool pressure requirement of workpieces of different materials or different thicknesses can be met, and the processing effect is improved.

[0054] To realize the function that the elastic coefficient of the first elastic assembly 314 increases in a segmented manner, the first elastic assembly 314 can alternatively include at least two springs with different free lengths arranged in parallel. When the driving assembly 312 moves downward, the spring with a longer length is first contacted and compressed, and the corresponding elastic coefficient is smaller. When the driving assembly 312 continues to move downward to contact the second spring with a longer length, the corresponding elastic coefficient is the sum of the elastic coefficients of the two springs. In this way, the function that the elastic coefficient of the first elastic assembly 314 increases in a segmented manner is realized. In actual application, the elastic coefficients of different springs can be the same or different, which can be determined according to actual conditions.

[0055] As an example, Figure 2 and Figure 3 The first elastic assembly 314 includes at least a first spring 3141 and a second spring 3142 arranged at intervals, the free length of the first spring 3141 is greater than that of the second spring 3142, and the elastic coefficient of the first spring 3141 is smaller than that of the second spring 3142.

[0056] In this embodiment, when the driving assembly 312 moves downward, the first spring 3141 with longer free length is compressed first, and the corresponding spring coefficient is smaller, the downward pressure of the moving assembly 313 and the tool module 320 is provided by the first spring 3141, which is suitable for the workpiece processing with smaller tool pressure requirement. When the driving assembly 312 moves downward to compress the second spring 3142, the corresponding spring coefficient is the sum of the spring coefficients of the first spring 3141 and the second spring 3142, and then the downward pressure of the moving assembly 313 and the tool module 320 is provided by the first spring 3141 and the second spring 3142 together, which is suitable for the workpiece processing with larger tool pressure requirement.

[0057] Specifically, one end of the first spring 3141 and the second spring 3142 is connected with the moving assembly 313, and the other end of the first spring 3141 and the second spring 3142 is free to extend towards the driving assembly 312. In this way, the height of the first spring 3141 is higher than the height of the second spring 3142, the driving assembly 312 first contacts and compresses the first spring 3141 by a distance, and then contacts the second spring 3142 while compressing the first spring 3141 and the second spring 3142.

[0058] For example, the difference between the free length of the first spring 3141 and the free length of the second spring 3142 is 5mm, at this time, the first spring 3141 provides the downward pressure when the driving assembly 312 is pressed downward by 0-5mm, and the first spring 3141 and the second spring 3142 together provide the downward pressure when the driving assembly 312 is continuously moved downward by 5mm-10mm.

[0059] In an embodiment of the present application, as shown in Figure 2 and Figure 3 The moving assembly 313 includes a moving piece 3131, a first mounting portion 3132 and a second mounting portion 3133, the moving piece 3131 is in sliding connection with the support 311, and the lower end of the moving piece 3131 is connected with the tool module 320; the first mounting portion 3132 is arranged on one side of the moving piece 3131 and below the driving assembly 312, and the first elastic assembly 314 is arranged between the first mounting portion 3132 and the driving assembly 312; the second mounting portion 3133 is arranged on one side of the moving piece 3131 and above the first mounting portion 3132 in a spaced manner; at least part of the driving assembly 312 is located between the first elastic assembly 314 and the second mounting portion 3133, for driving the moving piece 3131 to move up and down.

[0060] In this way, when the driving assembly 312 moves downward, the first elastic assembly 314 is compressed, and then the first mounting portion 3132 is pushed to drive the moving piece 3131 to move downward, so that the tool module 320 presses the workpiece downward. When the driving assembly 312 moves upward, the second mounting portion 3133 is pushed to drive the moving piece 3131 to move upward, so that the tool module 320 moves away from the workpiece.

[0061] It can be understood that the first mounting portion 3132 serves to mount the first elastic assembly 314, and the specific structure thereof can be determined according to actual conditions, for example, can be a plate structure or a groove structure, etc. As an example, the first mounting portion 3132 can be a mounting groove structure, so as to mount the first spring 3141 and the second spring 3142, and the upper ends of the first spring 3141 and the second spring 3142 extend upward freely.

[0062] It can be understood that the second mounting portion 3133 serves to resist the driving assembly 312, so that the driving assembly 312 can push the second mounting portion 3133 to move upward, and the specific structure thereof can be determined according to actual conditions, for example, can be a plate structure or a groove structure, etc.

[0063] Optionally, the first mounting portion 3132 and the second mounting portion 3133 can be an integral molding structure with the moving piece 3131, or a separate fixing structure.

[0064] In order to further improve the accuracy of the tool pressure control, for example, Figure 2 and Figure 3 The tool pressure control mechanism 310 further comprises a second elastic assembly 315 connected between the second mounting portion 3133 and the driving assembly 312.

[0065] By arranging the second elastic assembly 315 between the second mounting portion 3133 and the driving assembly 312, when the driving assembly 312 moves upward, the second elastic assembly 315 can offset the gravity of the moving assembly 313 and the tool module 320, so that the driving assembly 312 is not disturbed by the gravity of the mechanism components when moving upward to adjust the downward pressure of the tool module 320, so that the tool pressure can be controlled more accurately and reliably.

[0066] Optionally, the second elastic assembly 315 comprises two reset springs arranged at intervals, so that the driving assembly 312 moves more stably when moving upward, and the pressure of the tool module 320 on the workpiece is more stable.

[0067] In an embodiment of the present application, for example, Figure 2 and Figure 3 The driving assembly 312 comprises a lead screw 3121, a motor 3122 and a motor fixing piece 3123, the lead screw 3121 is fixedly arranged on the support 311; the motor 3122 is sleeved on the lead screw 3121 and can rotate along the lead screw 3121; the motor fixing piece 3123 is arranged at one end of the motor 3122 and is in sliding cooperation with the moving assembly 313; and the first elastic assembly 314 is clamped between the motor fixing piece 3123 and the moving assembly 313.

[0068] In this way, the motor 3122 rotates around the screw rod 3121 to realize the lifting movement relative to the support 311. The motor fixing member 3123 is arranged at the lower end of the motor 3122, and is used in sliding cooperation with the moving assembly 313, so that the lifting movement of the motor 3122 is more stable and reliable.

[0069] Specifically, the first elastic assembly 314 is clamped between the motor fixing member 3123 and the moving assembly 313, so that when the motor 3122 moves downward, the motor fixing member 3123 compresses the first elastic assembly 314 downward, and the first mounting portion 3132 of the moving assembly 313 is driven to move downward. Further, the second elastic assembly 315 is clamped between the motor fixing member 3123 and the second mounting portion 3133, and when the motor 3122 moves upward, the motor fixing member 3123 compresses the second elastic assembly 315 upward, and the second elastic assembly 315 generates an upward elastic force on the second mounting portion 3133 to offset the gravity of the moving assembly 313 and the tool module 320.

[0070] In an embodiment of the present application, as shown in Figure 2 and Figure 3 Figure 2 Figure 3 The support 311 includes two fixed plates 3111 arranged oppositely and spaced apart, and a side plate 3112 supporting and connecting the two fixed plates 3111, and the driving assembly 312 is arranged between the two fixed plates 3111. The moving assembly 313 is in sliding cooperation with the guide column 3113 between the two fixed plates 3111.

[0071] Specifically, the side plate 3112 is perpendicularly connected with the two fixed plates 3111, which enhances the reliability of the structure of the support 311. The screw rod 3121 is fixed on the upper fixed plate 3111 through a nut, and extends in the up-down direction. The motor 3122 is installed on the screw rod 3121 and can move up and down.

[0072] The guide column 3113 extends in the up-down direction and plays a guiding role in the movement of the moving assembly 313. Optionally, the moving member 3131 can be in sliding cooperation with the guide column 3113 through a linear bearing, and the first mounting portion 3132 and the second mounting portion 3133 are arranged on the side of the moving member 3131 facing the motor 3122.

[0073] In order to further improve the movement reliability of the moving assembly 313, two guide columns 3113 are arranged between the two fixed plates 3111, and the two guide columns 3113 are arranged spaced apart.

[0074] The utility model discloses still provide a kind of processing equipment, the processing equipment includes host computer, tool module 320 and knife pressure control mechanism 310, the specific structure of this knife pressure control mechanism 310 refers to above-mentioned embodiment, since the all technical solutions of above-mentioned all embodiments are used in the processing equipment, at least have all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer one by one elaboration.

[0075] The above is only preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made under the inventive concept of the utility model, using the utility model specification and the contents of drawings, or direct / indirectly applied in other related technical fields are included in the patent protection range of the utility model.

Claims

1. A knife pressure control mechanism characterized by, The tool pressure control mechanism comprises: a support; a driving assembly movably arranged on the support; a moving assembly movably arranged on the support and drivingly connected with the driving assembly, the moving assembly being used for mounting a tool module and moving the tool module towards a workpiece; and a first elastic assembly connected between the driving assembly and the moving assembly, and used for adjusting the pressure of the tool module on the workpiece.

2. The knife pressure control mechanism of claim 1, wherein, The first elastic assembly is arranged on the side of the driving assembly close to the tool module, and the driving assembly can compress the first elastic assembly to drive the moving assembly to move towards the workpiece. In the direction in which the driving assembly compresses the first elastic assembly, the elastic coefficient of the first elastic assembly increases in a segmented manner.

3. The knife pressure control mechanism of claim 2, wherein, The first elastic assembly comprises at least a first spring and a second spring arranged at intervals, the free length of the first spring is greater than the free length of the second spring, and the elastic coefficient of the first spring is less than the elastic coefficient of the second spring.

4. The knife pressure control mechanism of claim 3, wherein, One end of the first spring and the second spring is connected with the moving assembly, and the other end of the first spring and the second spring extends freely towards the driving assembly.

5. The knife pressure control mechanism of any one of claims 1 to 4, wherein, The moving assembly can move up and down relative to the support to drive the tool module to move up and down.

6. The knife pressure control mechanism of claim 5, wherein, The moving assembly comprises: a moving piece slidingly connected with the support, the lower end of the moving piece being connected with the tool module; a first mounting portion arranged on one side of the moving piece and located below the driving assembly, the first elastic assembly being arranged between the first mounting portion and the driving assembly; and a second mounting portion arranged on one side of the moving piece and located above the first mounting portion at intervals, at least part of the driving assembly being located between the first elastic assembly and the second mounting portion to drive the moving piece to move up and down.

7. The knife pressure control mechanism of claim 6, wherein, The tool pressure control mechanism further comprises a second elastic assembly connected between the second mounting portion and the driving assembly.

8. The knife pressure control mechanism of any one of claims 1 to 4, wherein, The driving assembly comprises: a lead screw fixedly arranged on the support; a motor sleeved on the lead screw and rotatable along the lead screw; and a motor fixing piece arranged on one end of the motor and slidingly matched with the moving assembly, the first elastic assembly being clamped between the motor fixing piece and the moving assembly.

9. The knife pressure control mechanism of any one of claims 1 to 4, wherein, The support comprises two fixed plates arranged at intervals and opposite to each other, and a side plate supporting and connecting the two fixed plates, the driving assembly being arranged between the two fixed plates; a guide column is arranged between the two fixed plates, and the moving assembly is slidingly matched with the guide column.

10. A processing apparatus characterized by comprising: The tool pressure control mechanism comprises: a main machine; a tool module; and the tool pressure control mechanism according to any one of claims 1 to 9, the support being connected with the main machine, and the tool module being connected with the moving assembly. ​

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