CN220718541U - CNC machining clamp special for key metal material belt - Google Patents

Abstract

The utility model relates to the technical field of nonstandard machining tool design, in particular to a CNC machining clamp special for a key metal material belt. The CNC machining fixture special for the key metal material belt comprises a bottom plate, a cover plate and a locking unit. A plurality of parallel lower milling cutter avoiding notches and upper milling cutter avoiding notches are formed on the bottom plate and the cover plate respectively. The metal strips are clamped by the bottom plate and the cover plate in a coordinated manner and are tightly clamped by the locking unit. The back and the front of the metal material belt are respectively exposed to the milling cutter through the lower milling cutter avoiding notch and the upper milling cutter avoiding notch. In practical application, a worker can realize milling of the front and back surfaces of the metal material belt through one-time clamping operation, and the clamp can be automatically turned over midway without repeated disassembly and clamping, so that the positioning error caused by repeated clamping is avoided; furthermore, the clamping operation of at least two metal strips can be realized by one-time operation, so that the working intensity of workers is effectively reduced, and the milling efficiency is improved.

Description

CNC machining clamp special for key metal material belt

Technical Field

The utility model relates to the technical field of nonstandard machining tool design, in particular to a CNC machining clamp special for a key metal material belt.

Background

The decoration key (as shown in fig. 1) is widely applied to the field of electronic products, and is usually sleeved on a key body for combined use so as to achieve a decoration effect. In actual production, the key metal material strip is firstly molded (as shown in fig. 2), and after surface processing, the key metal material strip is sequentially separated to form independent decorative key finished products in batches, and finally, the key finished products are separated and stored in a warehouse.

The preparation of the key metal material belt is mainly applied to two process schemes, and specifically comprises the following steps: in the first technical scheme, for the situation that the thickness of the metal strip is less than 1.2mm, a profiling operation is carried out on the metal strip by means of a profiling die so as to form a plurality of decorative keys on the metal strip, and then a blanking operation is carried out on the metal strip by means of a blanking die so as to hollowed out the metal strip; in the second technical scheme, for the situation that the thickness of the metal strip is larger than 1.2mm, the milling cutter is preferably used for milling the front side and the back side of the metal strip so as to form the decorative key, and then the material removing hollowed-out process is carried out so as to weaken the connection strength between the individual decorative key and the periphery of the decorative key.

For the situation of preparing a large-thickness-size key metal material belt, in terms of the current state of the industry, a metal strip is usually clamped on a clamp and then integrally fixed on a CNC (computerized numerical control) machine tool workbench. The conventional clamp is mainly composed of a bottom plate and a cover plate. The milling cutter avoiding notch is formed in the cover plate only, so that the milling cutter can extend into the milling cutter to finish milling surfaces or milling contours. After finishing the milling operation of the front surface of the metal strip, removing the metal strip from the clamp, turning over for 180 degrees, clamping the metal strip in the clamp again, and continuously finishing the milling operation of the back surface of the metal strip, so that the decorative key is formed; after the machining operation is finished, the metal strip is detached from the clamp and flows to a laser cutting or water cutting station to execute the material removing hollowed-out operation. The technical scheme has the following problems in actual implementation: 1) In the process of milling and forming the decorative keys, the metal strip is required to be subjected to two clamping operations, so that positioning errors can be inevitably generated, and the final forming quality of the key metal material strip is finally affected; 2) The single metal strip can be clamped as much as possible by one-time clamping, and when one surface of the metal strip is milled, a great amount of manpower and material resources are required to be spent for repeated disassembly and clamping operations, so that the working strength of workers can be increased, and the manufacturing cost of single key products can be increased. Thus, a technician is required to solve the above problems.

Disclosure of Invention

Therefore, in view of the above-mentioned problems and drawbacks, the present utility model sets the related data, through multiple evaluations and consideration, and through continuous experiments and modification by the set personnel, the present utility model finally results in the appearance of the CNC machining fixture dedicated for the metal material belt of the key.

In order to solve the technical problems, the utility model relates to a CNC machining fixture special for a key metal material belt, which is suitable for machining and forming the key metal material belt in a material preparation stage and comprises a bottom plate, a cover plate and a locking unit. N parallel lower milling cutter avoiding notches are formed on the bottom plate, and n is more than or equal to 2. N upper milling cutter avoiding grooves which are parallel and opposite to the lower milling cutter avoiding grooves are formed on the cover plate. The n metal strips which are arranged side by side and used for milling and forming the key metal strips are cooperatively clamped by the bottom plate and the cover plate, and are tightly applied by the locking unit. The back and the front of the metal material belt are respectively exposed to the milling cutter through the lower milling cutter avoiding notch and the upper milling cutter avoiding notch.

As a further improvement of the technical scheme of the utility model, the metal material belt of the single key is assumed to be linearly typeset with m keys. And m lower milling cutter bar avoidance extension contours and m upper milling cutter bar avoidance extension contours are respectively formed along two opposite side walls of the lower milling cutter avoidance notch and the upper milling cutter avoidance notch.

As a further improvement of the technical scheme of the utility model, a lower pressing boss is formed on the bottom plate around the periphery of the avoidance notch of the lower milling cutter. An upper pressing boss is formed on the cover plate around the periphery of the avoidance notch of the upper milling cutter. After the metal material belt is clamped, the lower pressing boss and the upper pressing boss cooperate to directly press the metal material belt.

As a further improvement of the technical scheme of the utility model, the clamping surfaces of the upper pressing boss and the lower pressing boss are respectively provided with an upper friction increasing structure and a lower friction increasing structure.

As a further improvement of the technical scheme of the utility model, the upper friction increasing structure is preferably upper friction increasing teeth or upper friction increasing protrusions formed on the clamping surface of the upper pressing boss. The lower friction increasing structure is preferably lower friction increasing teeth or lower friction increasing protrusions formed on the clamping surface of the lower pressing boss.

As a further improvement of the technical scheme of the utility model, assuming that the thickness of the metal material belt is t, the groove depth value of the upper friction increasing tooth is t1, and the groove depth value of the lower friction increasing tooth is t2, the t1 is less than or equal to 1/5t, and the t2 is less than or equal to 1/5t.

As a further improvement of the technical proposal of the utility model, the locking unit is composed of a plurality of groups of screw fasteners which penetrate through the bottom plate and the cover plate at the same time.

As a further improvement of the technical scheme of the utility model, a plurality of upper screw through holes for the screw fasteners to pass through are formed on the cover plate around the avoiding notch of the upper milling cutter. Is aligned with the upper screw through hole, and a plurality of lower threaded holes for the screw fasteners to pass through are formed on the bottom plate.

As a further improvement of the technical scheme of the utility model, the CNC machining fixture special for the key metal material belt also comprises a limiting unit. The limiting unit is used for ensuring that the cover plate is accurately positioned relative to the bottom plate and comprises a left limiting pin and a right limiting pin. The left-position limiting pin and the right-position limiting pin are oppositely positioned along the left-right direction and are inserted on the bottom plate, and correspondingly, the cover plate is provided with a left-position limiting pin hole matched with the left-position limiting pin and a right-position limiting pin hole matched with the right-position limiting pin.

As a further improvement of the technical scheme of the utility model, the CNC machining fixture special for the key metal material belt also comprises a buffer unit. The buffer unit is used for avoiding the phenomenon that the metal material belt is damaged due to the action of rigid impact force in the falling process of the cover plate relative to the bottom plate, and is composed of a plurality of upright rubber columns assembled on the bottom plate.

In practical application, a worker can realize the milling of the front and back surfaces of the metal material belt through one-time clamping operation, and the clamp can be automatically turned over midway without repeated disassembly and clamping, so that the positioning error caused by repeated clamping is avoided, and the key metal material belt is finally ensured to have good finished product quality; furthermore, the clamping operation of at least two metal strips can be realized by one-time operation, so that the working intensity of workers is effectively reduced, the milling efficiency is improved, and the manufacturing cost of single key products is reduced.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a finished product of a decorative key according to the present utility model.

Fig. 2 is a schematic perspective view of a metal belt for a key according to the present utility model.

Fig. 3 is a schematic perspective view of a CNC machining fixture for a metal strip of keys according to the present utility model.

FIG. 4 is an exploded view of a CNC machining fixture for key metal strips of the present utility model.

Fig. 5 is a perspective view of a base plate in a CNC machining fixture for a key metal strip according to the present utility model.

Fig. 6 is a partial enlarged view of I of fig. 5.

FIG. 7 is a perspective view of another view of the base plate in the CNC machining fixture for key metal strips of the present utility model.

Fig. 8 is a perspective view of one view of the cover plate in the CNC machining fixture for the key metal strip of the present utility model.

Fig. 9 is a perspective view of another view of a cover plate in the CNC machining fixture for a key metal strip of the present utility model.

Fig. 10 is a partial enlarged view of II of fig. 9.

Fig. 11 is a front view of fig. 3.

Fig. 12 is a cross-sectional view A-A of fig. 11.

Fig. 13 is an enlarged view of part III of fig. 12.

1-a bottom plate; 11-a lower milling cutter avoiding notch; 12-the lower milling cutter bar avoids the extension outline; 13-arranging a pressing boss; 131-a lower friction increasing structure; 1311-lower friction increasing protrusions; 14-arranging a threaded hole downwards; 2-cover plate; 21-an upper milling cutter avoiding notch; 22-the upper milling cutter bar avoids the extension outline; 23-upper pressing boss; 231-upper friction increasing structure; 2311-upper friction increasing teeth; 24-upper screw through holes; 25-left limiting pin holes; 26-right limit pin holes; a 3-locking unit; 31-screw fasteners; 4-a limiting unit; 41-left-positioned limiting pins; 42-right limiting pin; a 5-buffer unit; 51-rubber column.

Detailed Description

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "front", "rear", "upper", "lower", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the following, the disclosure of the present utility model will be further described in detail with reference to the specific embodiments, and fig. 3 and 4 respectively show a schematic perspective view and an exploded view of a CNC machining fixture for a metal material belt for a key according to the present utility model, which is mainly composed of a base plate 1, a cover plate 2, a locking unit 3, and the like. As shown in fig. 5, 2 parallel lower milling cutter avoiding notches 11 are formed on the base plate 1. As shown in fig. 8, 2 upper milling cutter escape slots 21 are formed in the cover plate 2 in parallel and in a position opposite to the lower milling cutter escape slots 11. The 2 metal strips placed side by side are clamped in cooperation by the bottom plate 1 and the cover plate 2 and are tightened by means of the locking unit 3. The back and the front of the metal material belt are respectively exposed to the milling cutter through the lower milling cutter avoiding notch 11 and the upper milling cutter avoiding notch 12. The metal material belt is subjected to milling processing to form the key metal material belt.

In actual production, a worker places two metal strips on the bottom plate 1 side by side and respectively and accurately aligns with the two lower milling cutter avoidance notches 11, then, the cover plate 2 is buckled on the bottom plate 1, the alignment accuracy of the metal strips and the two upper milling cutter avoidance notches 21 is confirmed again, and then, the locking unit 3 is used for locking, so that the metal strips are ensured to always occupy the correct relative positions in the whole milling process; and then, the CNC numerical control machine is used for sequentially carrying out milling operation on the front side and the back side of the two metal strips until the appearance outline of each key is formed, and the clamp is only required to be automatically turned 180 degrees during milling, so that the participation of workers is not required.

By adopting the technical scheme, the front and back milling processing of the metal material belt can be realized by one-time clamping operation of workers, and the fixture can be automatically turned over midway without repeated disassembly and clamping, so that the positioning error caused by repeated clamping is avoided, and the key metal material belt is finally ensured to have good finished product quality; furthermore, the clamping operation of at least two metal strips can be realized by one-time operation, so that the working intensity of workers is effectively reduced, the milling efficiency is improved, and the manufacturing cost of single key products is reduced.

As shown in fig. 2, a single key metal strip is linearly arranged with a plurality of keys. As shown in fig. 7 and 8, the same number of lower milling cutter bar avoidance extension profiles 12 and upper milling cutter bar avoidance extension profiles 22 are respectively molded along the two opposite side walls of the lower milling cutter avoidance slot 11 and the upper milling cutter avoidance slot 21. On one hand, the milling cutter mounting shaft can be effectively avoided, and smooth implementation of milling is ensured; on the other hand, the clamping working surface area of the bottom plate 1 and the cover plate 2 can be increased as much as possible, so that stable clamping of the metal material strip is ensured, and the phenomenon of position change caused by the action of milling force in actual milling processing is avoided.

In order to better apply a pressing force to the metal strip by the base plate 1 and the cover plate 2, as a further optimization of the above-described technical solution, as shown in fig. 5, a lower pressing boss 13 is formed on the base plate 1 around the periphery of the lower milling cutter escape slot 11. As shown in fig. 9, an upper pressing boss 23 is formed on the cover plate 2 around the periphery of the upper milling cutter escape slot 21. After the metal strip is clamped, the lower pressing boss 13 and the upper pressing boss 23 cooperate to directly press the metal strip.

As is clear from fig. 5 and 9, the upper pressing boss 23 and the lower pressing boss 13 are provided with an upper friction increasing structure 231 and a lower friction increasing structure 131, respectively. As shown in fig. 10, the upper friction increasing structure 231 is upper friction increasing teeth 2311 formed on the clamping surface of the upper pressing boss 23. As shown in fig. 6, the lower friction increasing structure 131 is a lower friction increasing protrusion 1311 formed on the clamping surface of the lower pressing boss 13. Thus, after the bottom plate 1 and the cover plate 2 are fastened, the back surface of the metal material belt is supported by the plurality of lower friction increasing protrusions 1311 in a cooperative manner, and the front surface of the metal material belt is pressed against the plurality of upper friction increasing teeth 2311 in a cooperative manner (as shown in fig. 11, 12 and 13), which means that the roughness of the clamping working surfaces of the bottom plate 1 and the cover plate 2 is obviously increased, so that the metal material belt can be effectively lifted to occupy the correct relative position relative to the clamp after being clamped.

Through multiple experimental demonstration, assuming that the thickness of the metal material belt is t, the groove depth value of the upper friction increasing tooth is t1, and the groove depth value of the lower friction increasing tooth is t2, t1 is preferably less than or equal to 1/5t, and t2 is preferably less than or equal to 1/5t. Thus, the phenomenon that the clamping strength of the metal material belt is weakened due to the fact that the metal material belt is excessively deep by the upper friction increasing teeth 2311 or/and the lower friction increasing protrusions 1311 due to the fact that the tightening force is excessively large can be effectively avoided.

As shown in fig. 3 and 4, the locking unit 3 is preferably constituted by a plurality of sets of screw fasteners 31 penetrating the base plate 1 and the cover plate 2 at the same time. As shown in fig. 8 and 9, a plurality of upper screw through holes 24 through which screw fasteners 31 pass are formed in the cover plate 2 around the periphery of the upper milling cutter escape slot 21. As shown in fig. 5 and 7, a plurality of lower screw holes 14 through which screw fasteners 31 pass are formed in the base plate 1 in a positive alignment with the upper screw through holes 24. In this way, compared with the conventional fastening means (the screw fasteners 31 are only arranged along the outer contours of the bottom plate 1 and the cover plate 2), the peripheral edges of the metal strips are ensured to be subjected to stable clamping force on the premise of ensuring that the bottom plate 1 and the cover plate 2 are reliably fastened, and the metal strips still occupy correct relative positions relative to the clamp even if subjected to milling force in the processing process.

As shown in fig. 3 and 4, the special CNC machining fixture for the key metal strip is additionally provided with a limiting unit 4. The limiting unit 4 is used for ensuring that the cover plate 2 is accurately positioned relative to the bottom plate 1, so as to realize correct clamping of the metal material belt. The limiting unit 4 comprises a left limiting pin 41 and a right limiting pin 42. The left and right position-restricting pins 41 and 42 are relatively positioned in the left-right direction and are both inserted on the base plate 1 (as shown in fig. 5), and correspondingly, the cover plate 2 is provided with a left position-restricting pin hole 25 adapted to the left position-restricting pin 41 and a right position-restricting pin hole 26 adapted to the right position-restricting pin 42 (as shown in fig. 9).

Finally, it should be further noted that, in order to avoid the metal strip being damaged due to the action of rigid impact force during the falling process of the cover plate 2 relative to the bottom plate 1, and further influence the smooth implementation phenomenon of the milling process, as a further optimization of the above technical solution, as shown in fig. 3 and 4, the CNC machining fixture dedicated for the key metal strip is also matched with a buffer unit 5. The buffer unit 5 is composed of a plurality of rubber columns 51 assembled upright on the base plate 2. After the metal material belt is positioned on the bottom plate 1, in the process that a worker holds the cover plate 2 to press the bottom plate 1, the rubber column 51 is subjected to self-adaptive elastic deformation due to the action of extrusion force, and has a good buffering effect, so that the phenomenon of pressure loss of the metal material belt due to the action of instantaneous extrusion force can be effectively avoided.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The CNC machining fixture special for the key metal material belt is suitable for machining and forming the key metal material belt in the material preparation stage and is characterized by comprising a bottom plate, a cover plate and a locking unit; forming n parallel lower milling cutter avoiding notches on the bottom plate, wherein n is more than or equal to 2; n upper milling cutter avoiding notches which are parallel to each other and are opposite to the lower milling cutter avoiding notches are formed in the cover plate; n metal strips which are arranged side by side and used for milling and forming key metal strips are cooperatively clamped by the bottom plate and the cover plate, and are tightly applied by the locking unit; the back and the front of the metal material belt are respectively exposed to the milling cutter through the lower milling cutter avoiding notch and the upper milling cutter avoiding notch.

2. The CNC machining fixture for key metal strips of claim 1, wherein a single key metal strip is assumed to have m keys linearly arranged; and m lower milling cutter bar avoidance extension contours and m upper milling cutter bar avoidance extension contours are respectively formed along two opposite side walls of the lower milling cutter avoidance notch and the upper milling cutter avoidance notch.

3. The CNC machining fixture for metal material belt for key set of claim 1, wherein a lower pressing boss is formed around the periphery of the lower milling cutter avoiding notch; an upper pressing boss is formed on the cover plate around the periphery of the avoidance notch of the upper milling cutter; after the metal material belt is clamped, the lower pressing boss and the upper pressing boss cooperate to directly press the metal material belt.

4. The CNC machining fixture special for key metal strips according to claim 3, wherein the clamping surfaces of the upper pressing boss and the lower pressing boss are respectively provided with an upper friction increasing structure and a lower friction increasing structure.

5. The CNC machining fixture for metal material belt for press key of claim 4, wherein the upper friction increasing structure is an upper friction increasing tooth or an upper friction increasing protrusion formed on the clamping surface of the upper pressing boss; the lower friction increasing structure is formed by lower friction increasing teeth or lower friction increasing protrusions on the clamping surface of the lower pressing boss.

6. The CNC machining fixture for metal material belt for push button key set of claim 5, wherein assuming that the thickness of the metal material belt is t, the groove depth of the upper friction increasing tooth is t1, and the groove depth of the lower friction increasing tooth is t2, then t1 is less than or equal to 1/5t, and t2 is less than or equal to 1/5t.

7. The CNC machining fixture for key metal strips according to claim 1, wherein the locking unit is composed of a plurality of sets of screw fasteners penetrating through the base plate and the cover plate at the same time.

8. The CNC machining fixture for metal material belt for key set of claim 7, wherein a plurality of upper screw through holes for the screw fastener to pass through are formed around the upper milling cutter avoiding notch on the cover plate; and a plurality of lower threaded holes for the screw fasteners to pass through are formed on the bottom plate in alignment with the upper screw through holes.

9. The special CNC machining fixture for key metal strips according to any one of claims 1 to 8, further comprising a limiting unit; the limiting unit is used for ensuring that the cover plate is accurately positioned relative to the bottom plate and comprises a left limiting pin and a right limiting pin; the left limiting pin and the right limiting pin are oppositely positioned along the left-right direction and are inserted on the bottom plate, and correspondingly, the cover plate is provided with a left limiting pin hole matched with the left limiting pin and a right limiting pin hole matched with the right limiting pin.

10. The CNC machining fixture for metal key material belt according to any one of claims 1 to 8, further comprising a buffer unit; the buffer unit is used for avoiding the phenomenon that the metal material belt is damaged due to the action of rigid impact force in the falling process of the cover plate relative to the bottom plate, and is composed of a plurality of upright rubber columns assembled on the bottom plate.