CN110667033A - Fingerprint hole machining method - Google Patents
Fingerprint hole machining method Download PDFInfo
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- CN110667033A CN110667033A CN201910887087.1A CN201910887087A CN110667033A CN 110667033 A CN110667033 A CN 110667033A CN 201910887087 A CN201910887087 A CN 201910887087A CN 110667033 A CN110667033 A CN 110667033A
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- fingerprint
- cylinder
- mounting groove
- fingerprint module
- module mounting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14008—Inserting articles into the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
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- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a fingerprint hole processing method, which comprises the following steps: providing a workpiece to be machined, performing in-mold injection molding on the workpiece to be machined, forming a reference cylinder and a fingerprint module installation groove, taking a plane where the bottom wall of the fingerprint module installation groove is located as a datum plane, taking the central axis of the reference cylinder to be vertical to the datum plane, taking the central point of the bottom wall of the fingerprint module installation groove as a datum point, and taking the central point of the projection of the reference cylinder on the datum plane as a reference point; acquiring actual absolute coordinates of a reference point on a reference surface by measuring the peripheral surface of the reference cylinder; combining preset relative position coordinates to obtain actual absolute coordinates of the reference point on the reference surface; and processing the fingerprint hole on the bottom wall of the fingerprint module mounting groove by taking the actual absolute coordinate of the datum point on the datum plane as the coordinate of the circle center of the fingerprint hole to be processed.
Description
Technical Field
The invention relates to the field of electronic equipment manufacturing, in particular to a fingerprint hole machining method.
Background
The mobile phone has become an indispensable communication tool, and people have higher and higher requirements on the mobile phone, and the mobile phone is not only a single electronic device aiming at communication, but also a multimedia mobile phone integrating functions of music, video, photographing, internet surfing and the like. With the continuous development of the mobile phone industry, the performance of the mobile phone is stronger and stronger.
At present, the fingerprint identification function arranged on the mobile phone is more and more popular with users, the users can conveniently open the mobile phone, and the opening password of the mobile phone can be prevented from being revealed. Fingerprint hole sets up on the product usually, the preparation in present fingerprint hole generally forms the fingerprint module mounting groove that is used for installing the fingerprint module when cell-phone shell injection moulding, then the cell wall through coordinate measuring equipment detection fingerprint module mounting groove, obtain the coordinate in the centre of a circle of fingerprint module mounting groove, again with the coordinate in the centre of a circle of the fingerprint module mounting groove that obtains as the centre of a circle coordinate in fingerprint hole, process out the fingerprint hole on the cell-phone shell, but because there is more burr on the inner wall of injection moulding's fingerprint module mounting groove, make the centre of a circle coordinate that measures fingerprint module mounting groove have more big error, the concentricity in the fingerprint hole that leads to fingerprint module mounting groove and CNC to process out is very low, make the fingerprint module install can deviate the fingerprint hole behind the fingerprint module mounting groove, influence the function of fingerprint module.
Disclosure of Invention
In view of the above, in order to solve the above problems, a fingerprint hole processing method is provided, which enables a very high concentricity between a fingerprint hole and a fingerprint module mounting groove.
A fingerprint hole machining method comprises the following steps:
providing a workpiece to be machined, performing in-mold injection molding on the workpiece to be machined, forming a reference cylinder and a fingerprint module installation groove, taking a plane where the bottom wall of the fingerprint module installation groove is located as a reference surface, taking the central axis of the reference cylinder to be perpendicular to the reference surface, taking the central point of the bottom wall of the fingerprint module installation groove as a reference point, and taking the central point of the projection of the reference cylinder on the reference surface as a reference point;
acquiring actual absolute coordinates of the reference point on the reference surface by measuring the peripheral surface of the reference cylinder;
combining preset relative position coordinates to obtain actual absolute coordinates of the reference point on the reference surface;
and processing the fingerprint hole on the bottom wall of the fingerprint module mounting groove by taking the actual absolute coordinate of the reference point on the reference surface as the coordinate of the circle center of the fingerprint hole to be processed.
The fingerprint hole processing method comprises the steps of performing in-mold injection molding on a workpiece to be processed to form a fingerprint module mounting groove and a reference cylinder, taking the plane where the bottom wall of the fingerprint module mounting groove is located as a reference surface, taking the central axis of the reference cylinder to be vertical to the reference surface, taking the central point of the bottom wall of the fingerprint module mounting groove as a reference point, and taking the central point of the projection of the reference cylinder on the reference surface as a reference point, wherein the fingerprint module mounting groove and the reference cylinder are simultaneously injection molded, so that the relative position between the fingerprint module mounting groove and the reference cylinder can be ensured, and the surface of the injection molded reference cylinder is smooth and has few burrs, so that the three-dimensional coordinate of the central axis of the reference cylinder can be accurately measured by measuring the outer peripheral surface of the reference cylinder, and the actual absolute coordinate of the reference point on the reference surface is obtained according, the actual absolute coordinate of the reference point on the reference surface can be accurately calculated by combining the coordinate of the predicted relative position, and then the actual absolute coordinate of the reference point on the reference surface is taken as the central coordinate of the fingerprint hole to be processed, so that the fingerprint hole concentric with the fingerprint module mounting groove can be accurately processed on the workpiece to be processed, and the concentricity of the fingerprint module mounting groove and the fingerprint hole is ensured.
In one of them embodiment, before the step of processing out the fingerprint hole on the diapire of fingerprint module mounting groove, still include: detect whether the installation of fingerprint module is influenced to burr on the cell wall of fingerprint module mounting groove, if, then right the cell wall of fingerprint module mounting groove carries out burring work. Whether burr on the cell wall through detecting fingerprint module mounting groove influences the installation of fingerprint module, is for the convenience of follow-up fingerprint module can install smoothly in fingerprint module mounting groove.
In one embodiment, in the step of deburring the groove wall of the fingerprint module mounting groove, the groove wall of the fingerprint module mounting groove is milled by a milling cutter, and the workpiece to be machined is fixed by suction holes in an adsorption manner. Adsorb fixedly through inhaling the hole and treat the machined part, can reduce the vibration of treating the machined part at the in-process of milling cutter deburring on the cell wall of fingerprint module mounting groove for the cell wall of fingerprint module mounting groove is difficult for producing the bad sword that shakes when the turnning and milling, guarantees the high smoothness behind the cell wall turnning and milling of fingerprint module mounting groove.
In one embodiment, the method further includes, before the step of machining the fingerprint hole on the bottom wall of the fingerprint module mounting groove by using the actual absolute coordinate of the reference point as the coordinate of the center of the fingerprint hole to be machined, the step of:
providing a protective sleeve, installing the protective sleeve in the fingerprint module mounting groove, the protective sleeve is attached to the inner wall of the fingerprint module mounting groove.
Through installing the protective sheath in fingerprint module mounting groove, can be when the cutter processing goes out the fingerprint hole, avoid the cutter because the cell wall of maloperation damage fingerprint module mounting groove.
In one embodiment, in the step of performing in-mold injection molding on the to-be-processed workpiece and forming the reference cylinder and the fingerprint module mounting groove, at least two alternative cylinders are formed on the to-be-processed workpiece, central axes of the alternative cylinders are perpendicular to the reference plane, and the alternative cylinder with the smoothest surface is selected as the reference cylinder.
At least two alternative cylinders are formed during injection molding of the workpiece to be machined, and the alternative cylinder with the smoothest surface is selected from the at least two alternative cylinders to serve as a reference cylinder, so that the accuracy of actual absolute coordinates of a subsequently obtained reference point on a reference surface can be further improved, and the concentricity of a subsequently machined fingerprint hole and a fingerprint module installation groove is further improved.
In one embodiment, the optional columns are distributed at intervals around the fingerprint module mounting groove.
Through setting up the even interval distribution of the central axis of alternative cylinder around fingerprint module mounting groove to the limit portion atress that makes fingerprint module mounting groove is even when the drawing die, can not take place great deformation, has guaranteed the shape of fingerprint module mounting groove, has ensured to install smoothly in fingerprint module mounting groove.
In one embodiment, the step of selecting the candidate cylinder with the smoothest surface as the reference cylinder specifically includes: and detecting the roughness of the outer surface of each alternative cylinder by adopting a contact method, and selecting the alternative cylinder with the smoothest surface as the reference cylinder by comparing the roughness of each alternative cylinder. The method adopts a contact pin method for detection, and is simple and convenient.
In one of them embodiment, before the step of processing out the fingerprint hole on the diapire of fingerprint module mounting groove, still include the step:
and placing a punching template assembly on the workpiece to be machined, wherein a cutter hole is formed in the punching template assembly corresponding to the fingerprint module mounting groove, positioning holes are formed in the punching template assembly corresponding to the alternative cylinders, the alternative cylinders penetrate through the positioning holes, and the punching template assembly is positioned on the workpiece to be machined.
Through placing the template subassembly that punches on treating the machined part, can avoid the cutter to treat the machined part fish tail when processing out the finger hole on the machined part.
In one embodiment, in the step of placing the punching template assembly on the workpiece to be processed, the punching template assembly includes a first rigid punching template and a second elastic punching template, the first punching module and the second punching module are connected, and the second punching template protrudes from the first punching template and faces the workpiece to be processed.
The second punching template is arranged to protrude out of the first punching template towards the side face of the workpiece to be machined, so that the punching template assembly is in contact with the workpiece to be machined through the elastic second punching template, and the workpiece to be machined cannot be crushed.
The invention also discloses a fingerprint hole processing method, which comprises the following steps:
providing a workpiece to be machined, performing in-mold injection molding on the workpiece to be machined, and forming a reference cylinder, wherein the central axis of the reference cylinder is vertical to a datum plane, and the central point of the projection of the reference cylinder on the datum plane is used as a reference point;
measuring the peripheral surface of the cylinder to obtain the actual absolute coordinates of the reference point on the reference surface;
combining preset relative position coordinates to obtain actual absolute coordinates of the circle center of the fingerprint hole to be processed on the reference surface;
processing out concentric fingerprint module mounting groove and fingerprint hole on treating the machined part with the actual absolute coordinate of waiting to process the fingerprint hole centre of a circle that obtains on the datum plane.
The fingerprint hole processing method comprises the steps of performing in-mold injection molding on a workpiece to be processed to form a reference cylinder, enabling the central axis of the reference cylinder to be perpendicular to a reference surface, enabling the central point of the projection of the reference cylinder on the reference surface to be used as a reference point, enabling the surface of the reference cylinder to be smooth and having few burrs due to the fact that the reference cylinder is injection molded, enabling the three-dimensional coordinate of the central axis of the reference cylinder to be accurately measured by measuring the outer peripheral surface of the reference cylinder, obtaining the actual absolute coordinate of the reference point on the reference surface according to the three-dimensional coordinate of the central axis of the reference cylinder, accurately calculating the actual absolute coordinate of the center of the fingerprint hole to be processed on the reference surface according to the predicted relative position coordinate, accurately processing the concentric fingerprint module mounting groove and the fingerprint hole on the workpiece to be processed according to the actual absolute coordinate of the center of the fingerprint hole to be processed on the reference surface, the concentricity of fingerprint module mounting groove and fingerprint hole has been guaranteed.
Drawings
Fig. 1 is a flowchart of a fingerprint hole processing method according to a first embodiment of the present invention;
FIG. 2 is a schematic perspective view of a part to be machined which has just been injection molded in the first embodiment;
FIG. 3 is an enlarged view of the area encircled by circle A in FIG. 2;
FIG. 4 is a schematic position diagram of a reference object and a base point in an XY rectangular coordinate system;
FIG. 5 is a schematic view of a fingerprint hole formed in the bottom wall of the fingerprint module mounting groove;
FIG. 6 is a flowchart of a fingerprint hole processing method according to a second embodiment of the present invention;
fig. 7 is a flowchart of a fingerprint hole processing method according to a third embodiment of the present invention;
fig. 8 is a flowchart illustrating a fingerprint hole processing method according to a fourth embodiment of the present invention;
FIG. 9 is a schematic view of a punch template assembly pressed onto a workpiece to be machined;
FIG. 10 is a perspective view of the punch template assembly;
FIG. 11 is a cross-sectional view of a second punch template;
fig. 12 is a flowchart illustrating a fingerprint hole processing method according to a fifth embodiment of the present invention;
FIG. 13 is a schematic view of a fifth embodiment showing a protective cover being mounted in a fingerprint module mounting slot;
fig. 14 is a flowchart of a fingerprint hole processing method according to a sixth embodiment of the present invention;
FIG. 15 is an enlarged view of a portion of a reference cylinder to be processed before a fingerprint hole and a fingerprint module mounting groove are formed in the sixth embodiment;
fig. 16 is an enlarged view of a portion of a workpiece to be processed where the cylinder is located after the fingerprint hole and the fingerprint module mounting groove are processed in the sixth embodiment.
In fig. 1 to 13:
10. a workpiece to be processed; 11. fingerprint module mounting grooves; 12. a reference column; 13. a fingerprint hole; 14. an arc-shaped surface; 20. a perforating template assembly; 21. drilling a cutter hole; 22. positioning holes; 23. a first punching template; 24. a second punching template; 241. a first silica gel layer; 242. a second silica gel layer; 243. a TPU layer; 30. a protective sleeve;
in fig. 14 to 16:
10a, a workpiece to be machined; 11a, a fingerprint module mounting groove; 12a, a reference column; 13a, fingerprint holes.
Detailed Description
In the description of the present invention, it is to be understood that the terms "length," "width," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", may explicitly or implicitly include one or more of that feature.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "fixed" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The first embodiment is as follows:
fig. 1 to 5 show a fingerprint hole processing method according to a first embodiment of the present invention.
Referring to fig. 1, a flowchart of a fingerprint hole processing method according to a first embodiment of the present invention includes the following steps:
s100, providing a to-be-processed piece 10, carrying out in-mold injection molding on the to-be-processed piece 10, forming a reference cylinder 12 and a fingerprint module installation groove 11, taking a plane where a bottom wall of the fingerprint module installation groove 11 is located as a reference plane, taking a central axis of the reference cylinder 12 to be perpendicular to the reference plane, taking a central point of the bottom wall of the fingerprint module installation groove 11 as a reference point, and taking a central point of a projection on the reference plane of the reference cylinder 12 as a reference point.
Treat that machined part 10 after injection moulding can be for cell-phone shell or other electronic product parts that need set up finger print hole and fingerprint module mounting groove. In the present embodiment, the to-be-processed member 10 after the in-mold injection molding is a mobile phone case.
Specifically, as shown in fig. 3, refer to cylinder 12 and be located the periphery of fingerprint module mounting groove 11, because refer to cylinder 12 and fingerprint module mounting groove 11 and be synchronous injection moulding, so can guarantee to refer to the relative position between cylinder 12 and the fingerprint module mounting groove 11. Injection moulding's reference cylinder 12 compares with injection moulding's fingerprint module mounting groove 11, and injection moulding's reference cylinder 12's surface can be more smooth than injection moulding's fingerprint module mounting groove 11's inner wall, and the burr of formation is also very few. In this embodiment, the fingerprint module mounting groove 11 is defined by two arc surfaces 14 arranged oppositely.
The member 10 to be machined may be made of a plastic material or a metal material. And the reference plane may be an XY plane, an XZ plane, or a YZ plane.
In order to allow for rapid and accurate measurement of the three-dimensional coordinates of the central axis of the reference cylinder 12, the reference cylinder 12 is preferably circular in cross-section. Further, the reference cylinder 12 is preferably conical, and the conical reference cylinder 12 not only facilitates rapid measurement of the three-dimensional coordinates of the central axis of the reference cylinder 12, but also facilitates the drawing of the reference cylinder 12.
S200, measuring the outer peripheral surface of the reference cylinder 12 to obtain the actual absolute coordinates of the reference point on the reference surface.
In the present embodiment, the outer peripheral surface of the reference cylinder 12 is measured by the three-dimensional coordinate measuring device, the three-dimensional coordinate of the central axis of the reference cylinder 12 is measured, and the two-dimensional coordinate projected on the reference plane by the central axis of the reference cylinder 12 is obtained from the measured three-dimensional coordinate of the central axis of the reference cylinder 12, and the two-dimensional coordinate is used as the actual absolute coordinate of the reference point on the reference plane. For example, if the reference plane is an XY plane and the measured three-dimensional coordinates of the reference cylinder 12 are (a, b, c), the actual absolute coordinates of the reference point on the XY plane are (a, b).
And S300, acquiring the actual absolute coordinate of the reference point on the reference surface according to the preset relative position coordinate.
The preset relative position coordinate may be a relative position coordinate of the preset reference point on the reference plane with respect to the reference point, or may be a relative position coordinate of the preset reference point on the reference plane with respect to the reference point.
Taking the preset relative position coordinate as the relative position coordinate of the preset reference point on the reference plane relative to the reference point, and taking the reference plane as an XY plane as an example, the calculation for obtaining the actual absolute coordinate of the reference point on the reference plane is specifically described as follows: coordinates shown in FIG. 4 are established, A in FIG. 4 represents a reference point, B represents a reference point, and a directed line segment is present
For the relative position coordinates of the reference point on the reference plane with respect to the reference point, assume
Has coordinates (△ X, △ Y) and the absolute coordinate of the reference point A is (X)Insulation A，YInsulation A)，The absolute coordinate of reference point B is (X)B seed of，YB seed of) From
Available (△ X, △ Y) ═ XInsulation A-XB seed of，YInsulation A-YB seed of) Further, the following equation is obtained:
△X＝Xinsulation A-XB seed of........................ (1)；
△Y＝YInsulation A-YB seed of........................ (2)；
From equations (1) and (2), the relationship can be derived:
Xb seed of＝XInsulation A-△X....................... (3)；
YB seed of＝YInsulation A-△Y....................... (4)。
For example, the relative position coordinates of the preset reference point a on the XY plane with respect to the reference point B are (-2,3), that is, △ X is-2, and △ Y is 3, and the actual absolute coordinates of the measured reference point a on the XY plane are (1,1), that is, △ X is 3Insulation A＝1，△YInsulation A1 is ═ 1; by substituting the above numerical values into the relational expressions (3) and (4), X can be obtaineda absolute＝1-(-2)＝3，YB seed ofThe actual absolute coordinates of reference point B on the XY plane are (3, -2) when the actual absolute coordinates are 1-3 or-2.
S400, processing out the fingerprint hole 13 on the bottom wall of the fingerprint module mounting groove 11 by using the actual absolute coordinate of the datum point on the datum plane as the coordinate of the circle center of the fingerprint hole 13 to be processed. The state of the member to be processed 10 in which the fingerprint hole 13 is processed is shown in fig. 5.
In the fingerprint hole processing method, the workpiece 10 to be processed is subjected to in-mold injection molding, a fingerprint module mounting groove 11 and a reference cylinder 12 are formed, a plane where the bottom wall of the fingerprint module mounting groove 11 is located is used as a reference plane, the central axis of the reference cylinder 12 is perpendicular to the reference plane, the central point of the bottom wall of the fingerprint module mounting groove 11 is used as a reference point, and the central point of the projection of the reference cylinder 12 on the reference plane is used as a reference point, because the fingerprint module mounting groove 11 and the reference cylinder 12 are simultaneously subjected to injection molding, the relative position between the fingerprint module mounting groove 11 and the reference cylinder 12 can be ensured, and because the surface of the reference cylinder 12 formed by injection molding is smooth and has very few burrs, the three-dimensional coordinates of the central axis of the reference cylinder 12 can be accurately measured by measuring the outer peripheral surface of the reference cylinder 12, and the actual absolute coordinates of the reference point on the reference plane can be, and the actual absolute coordinate of the reference point on the reference surface can be accurately calculated by combining the coordinate of the predicted relative position and the coordinate principle, and the actual absolute coordinate of the reference point on the reference surface is taken as the central coordinate of the fingerprint hole 13 to be processed, so that the fingerprint hole 13 concentric with the fingerprint module mounting groove 11 can be accurately processed on the workpiece 10 to be processed, and the concentricity of the fingerprint module mounting groove 11 and the fingerprint hole 13 is ensured.
Example two:
referring to fig. 6, a flowchart of a fingerprint hole processing method according to a second embodiment of the present invention is shown, where the difference between the first embodiment and the second embodiment is:
in the present embodiment, at least two candidate cylinders are formed on the workpiece 10 to be processed, the central axes of the candidate cylinders are perpendicular to the reference plane, and the candidate cylinder with the smoothest surface is selected as the reference cylinder 12. Through selecting out the alternative cylinder that the surface is the smoothest from at least two alternative cylinders as reference cylinder 12, can further improve the accuracy of the actual absolute coordinate of the reference point on the reference surface of follow-up acquisition, reach the purpose of further improving the concentricity of fingerprint hole 13 and fingerprint module mounting groove 11 after the follow-up processing is made.
In this embodiment, the roughness of the outer surface of each candidate cylinder is detected by a stylus method, and the candidate cylinder with the smoothest surface is selected as the reference cylinder 12 by comparing the roughness of each candidate cylinder. The roughness of the surface of the alternative cylinder is detected by a contact pin method, so that the detection method is simple and convenient.
Preferably, the even interval distribution of the central axis of alternative cylinder around fingerprint module mounting groove 11 to the limit portion atress that makes fingerprint module mounting groove 11 is even when the drawing die, can not take place great deformation, has guaranteed fingerprint module mounting groove 11's shape, has guaranteed that the fingerprint module can install smoothly in fingerprint module mounting groove 11.
After step S400, further comprising the steps of:
and S500, removing each optional column.
The alternative cylinder is removed after the fingerprint hole 13 is processed, so that the alternative cylinder can be prevented from occupying the internal space of the electronic equipment. The alternative cylinder may be removed by cutting the alternative cylinder layer by layer in a direction from the top end of the alternative cylinder to the bottom end of the alternative cylinder by a turning tool, and milling the remaining part of the alternative cylinder by a milling cutter, so that the plane on which the alternative cylinder is disposed maintains high smoothness, and the quality of the workpiece 10 to be machined is ensured.
Example three:
referring to fig. 7, a flowchart of a fingerprint hole processing method according to a third embodiment of the present invention is shown, where the difference between the present embodiment and the second embodiment is: before step S400, the method further includes:
step S310, detecting whether installation is affected by burrs on the wall of the fingerprint module installation groove 11; if not, the groove wall of the fingerprint module mounting groove 11 is not deburred; if, then carry out burring work to the cell wall of fingerprint module mounting groove 11 to the messenger can install smoothly in fingerprint module mounting groove 11.
In this embodiment, burrs on the groove wall of the fingerprint module mounting groove 11 are removed by a milling cutter. Further, in the step of getting rid of the burr on the cell wall of fingerprint module mounting groove 11 through milling cutter, adopt and inhale the hole and adsorb fixed and treat machined part 10. Adsorb fixedly through inhaling the hole and treat machined part 10, can reduce the vibration of treating machined part 10 at the in-process of milling cutter deburring on the cell wall of fingerprint module mounting groove 11 for the difficult bad sword that shakes that produces of cell wall of fingerprint module mounting groove 11 when the turnning and milling, the high smoothness degree after the cell wall turnning and milling of assurance fingerprint module mounting groove 11.
The present embodiment is configured such that the step S310 is located before the step S400, that is, the operation of removing the burrs on the groove walls of the fingerprint module mounting groove 11 by the milling cutter is placed before the operation of machining the fingerprint hole 13 on the member to be machined 10, the sequential arrangement can ensure that the part of the workpiece 10 to be processed, where the fingerprint module mounting groove 11 is located, can be adsorbed by the suction hole in more area in the process that the milling cutter removes burrs on the groove wall of the fingerprint module mounting groove 11, so that the part of the workpiece 10 to be processed where the fingerprint module mounting groove 11 is located is not easy to generate large vibration when the groove wall of the fingerprint module mounting groove 11 is milled, thereby make the cell wall of fingerprint module mounting groove 11 be difficult for producing bad sword that shakes more when the turn-milling, further guaranteed that the cell wall turn-milling of fingerprint module mounting groove 11 has higher smoothness after, help the installation in fingerprint module mounting groove 11.
It should be noted that, in other embodiments, the position of the step of detecting whether the burr on the groove wall of the fingerprint module installation groove 11 affects the installation of the fingerprint module may be changed as long as the position is between step S100 and step S400.
Example four:
referring to fig. 8, a flowchart of a fingerprint hole processing method according to a fourth embodiment of the present invention is shown, where the difference between the present embodiment and the third embodiment is: before step S400, the method further includes the steps of:
s320, placing the punching template assembly 20 on the workpiece 10, as shown in fig. 9, a tool hole 21 is formed in the punching template assembly 20 corresponding to the fingerprint module mounting groove 11, and a positioning hole 22 is formed in each of the optional columns, so that the optional column passes through the positioning hole 22, and the punching template assembly 20 is positioned on the workpiece 10.
The punching template assembly 20 is placed on the workpiece 10 to be processed, so that the workpiece 10 to be processed can be prevented from being scratched by a cutter when the cutter is used for processing the fingerprint hole 13 in the workpiece 10 to be processed.
As shown in fig. 10, the punching template assembly 20 includes a first rigid punching template 23 and a second flexible punching template 24 connected to each other, and the second punching template 24 protrudes from the side of the first punching template 23 facing the workpiece 10, so that the punching template assembly 20 contacts the workpiece 10 through the second flexible punching template 24 without crushing the workpiece 10.
As shown in fig. 11, the second hole-punching template 24 includes a first silicone layer 241, a second silicone layer 242, and a TPU layer 243 located between the first silicone layer 241 and the second silicone layer 242, the first silicone layer 241 is connected to the first hole-punching template 23, and the second silicone layer 242 is located on a side of the first silicone layer 241 away from the first hole-punching template 23; the TPU layer 243 and the first silicone rubber layer 241 and the TPU layer 243 and the second silicone rubber layer 242 are connected through glue. First silica gel layer 241, TPU layer 243 and second silica gel layer 242 all have elasticity, and the hole that inner structure all exists is very few moreover, and even smooth deformation can take place for the homoenergetic when receiving the extrusion, can guarantee that first punching template 23 can not take place the slope when receiving the extrusion for let sword hole 21 can the accurate fingerprint module mounting groove 11 that aligns, guarantee that first punching template 23 can not block the processing of cutter to fingerprint hole 13. In addition, the lower cost TPU layer 243 reduces the cost of the second hole forming die plate 24.
Example five:
referring to fig. 12, a flowchart of a fingerprint hole processing method according to a fifth embodiment of the present invention is shown, where the difference between the present embodiment and the third embodiment is:
before S400, the method further includes:
SA00, provide protective sheath 30, install protective sheath 30 in fingerprint module mounting groove 11, protective sheath 30 pastes with the inner wall of fingerprint module mounting groove 11 mutually.
The state of the member to be processed through step a00 is shown in fig. 13. Through installing protective sheath 30 in fingerprint module mounting groove 11, can avoid the cutter because the cell wall of maloperation damage fingerprint module mounting groove 11 when the cutter processing goes out the finger hole.
Example six:
fig. 14 to 16 show a fingerprint hole processing method according to a sixth embodiment of the present invention.
Referring to fig. 14, a flowchart of a fingerprint hole processing method according to a sixth embodiment of the present invention includes the following steps:
100a, providing a workpiece to be processed 10a, performing in-mold injection molding on the workpiece to be processed 10a, and forming a reference cylinder 12a, wherein the central axis of the reference cylinder 12a is vertical to a reference surface, and the central point of the reference cylinder 12a projected on the reference surface is taken as a reference point.
The to-be-processed piece 10 after injection molding can be a mobile phone shell or other electronic product parts needing to be provided with a fingerprint hole and a fingerprint module mounting groove, and the reference surface can be an XY plane, an XZ plane or a YZ plane. As shown in fig. 15, in the present embodiment, the workpiece to be processed after injection molding is a mobile phone case.
200a, measuring the outer peripheral surface of the reference cylinder 12a to obtain the actual absolute coordinates of the reference point on the reference surface.
In the present embodiment, the outer peripheral surface of the reference cylinder 12a is measured by a three-dimensional coordinate measuring device, the three-dimensional coordinate of the central axis of the reference cylinder 12a is measured, the two-dimensional coordinate of the projection of the central axis of the reference cylinder 12a on the reference plane is obtained from the measured three-dimensional coordinate of the central axis of the reference cylinder 12a, and the two-dimensional coordinate is used as the actual absolute coordinate of the reference point on the reference plane. For example, if the reference plane is an XY plane and the measured three-dimensional coordinates of the reference cylinder 12a are (a, b, c), the actual absolute coordinates of the reference point on the XY plane are (a, b).
And S300a, combining the preset relative position coordinates to obtain the actual absolute coordinates of the circle center of the fingerprint hole 13a to be processed on the reference surface.
The preset relative position coordinate may be a relative position coordinate of a preset reference point on the reference plane relative to the center of the to-be-machined fingerprint hole 13a, or may be a relative position coordinate of the preset center of the to-be-machined fingerprint hole 13a on the reference plane relative to the reference point.
The calculation process of obtaining the actual absolute coordinate of the center of the fingerprint hole 13a to be processed by combining the obtained actual absolute coordinate of the reference point on the reference plane with the preset relative position coordinate is the same as the calculation principle of obtaining the actual absolute coordinate of the reference point on the reference plane in the first embodiment, and is not specifically described here.
And S400a, processing the concentric fingerprint module mounting groove 11a and the fingerprint hole 13a on the workpiece 10a by using the obtained actual absolute coordinate of the center of the fingerprint hole 13a to be processed on the reference surface.
The state of the workpiece to be processed with the fingerprint module mounting groove 11a and the fingerprint hole 13a is shown in fig. 16. In this embodiment, the fingerprint module mounting groove 11a is defined by two arc surfaces 14a disposed oppositely.
The processing sequence of the fingerprint module mounting groove 11a and the fingerprint hole 13a may be before the processing of the fingerprint hole 13a by the processing of the fingerprint module mounting groove 11a, or before the processing of the fingerprint hole 13a by the processing of the fingerprint module mounting groove 11 a.
In the above-mentioned method for processing the fingerprint hole 13a, the workpiece 10a to be processed is injection molded in the mold to form the reference cylinder 12a, the central axis of the reference cylinder 12a is perpendicular to a reference plane, the central point of the reference cylinder 12a projected on the reference plane is used as the reference point, because the reference cylinder 12a is injection molded, the surface of the reference cylinder 12a is smooth and has very few burrs, so that the three-dimensional coordinates of the central axis of the reference cylinder 12a can be accurately measured by measuring the outer peripheral surface of the reference cylinder 12a, the actual absolute coordinates of the reference point on the reference plane can be obtained from the three-dimensional coordinates of the central axis of the reference cylinder 12a, and the actual absolute coordinates of the center of the fingerprint hole 13a to be processed on the reference plane can be accurately calculated by combining the coordinate principle, with the accurate processing go out concentric fingerprint module mounting groove 11a and fingerprint hole 13a on treating machined part 10a, guaranteed fingerprint module mounting groove 11a and fingerprint hole 13 a's concentricity.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A fingerprint hole machining method is characterized by comprising the following steps:
providing a workpiece to be machined, performing in-mold injection molding on the workpiece to be machined, forming a reference cylinder and a fingerprint module installation groove, taking a plane where the bottom wall of the fingerprint module installation groove is located as a reference surface, taking the central axis of the reference cylinder to be perpendicular to the reference surface, taking the central point of the bottom wall of the fingerprint module installation groove as a reference point, and taking the central point of the projection of the reference cylinder on the reference surface as a reference point;
acquiring actual absolute coordinates of the reference point on the reference surface by measuring the peripheral surface of the reference cylinder;
combining preset relative position coordinates to obtain actual absolute coordinates of the reference point on the reference surface;
and processing the fingerprint hole on the bottom wall of the fingerprint module mounting groove by taking the actual absolute coordinate of the reference point on the reference surface as the coordinate of the circle center of the fingerprint hole to be processed.
2. The fingerprint hole processing method of claim 1, further comprising, before the step of processing the fingerprint hole on the bottom wall of the fingerprint module mounting groove: detect whether the installation of fingerprint module is influenced to burr on the cell wall of fingerprint module mounting groove, if, then right the cell wall of fingerprint module mounting groove carries out burring work.
3. The fingerprint hole processing method according to claim 2, wherein in the step of deburring the groove wall of the fingerprint module mounting groove, the groove wall of the fingerprint module mounting groove is milled by a milling cutter, and the member to be machined is fixed by suction by a suction hole.
4. The fingerprint hole processing method according to claim 1, wherein the actual absolute coordinates of the reference points are used as coordinates of the center of the fingerprint hole to be processed, and before the step of processing the fingerprint hole on the bottom wall of the fingerprint module mounting groove, the method further comprises the following steps:
providing a protective sleeve, installing the protective sleeve in the fingerprint module mounting groove, the protective sleeve is attached to the inner wall of the fingerprint module mounting groove.
5. The fingerprint hole machining method according to claim 4, wherein in the step of performing in-mold injection molding on the workpiece to be machined and forming the reference cylinder and the fingerprint module installation groove, at least two alternative cylinders are formed on the workpiece to be machined, the central axes of the alternative cylinders are perpendicular to the reference surface, and the alternative cylinder with the smoothest surface is selected as the reference cylinder.
6. The fingerprint hole machining method of claim 5, wherein the alternative columns are distributed at intervals around the fingerprint module mounting groove.
7. The fingerprint hole machining method according to claim 5, wherein the step of selecting the candidate cylinder with the smoothest surface as the reference cylinder comprises the following steps: and detecting the roughness of the outer surface of each alternative cylinder by adopting a contact method, and selecting the alternative cylinder with the smoothest outer surface as the reference cylinder by comparing the roughness of each alternative cylinder.
8. The fingerprint hole processing method of claim 5, wherein before the step of processing the fingerprint hole on the bottom wall of the fingerprint module mounting groove, further comprising the steps of:
and placing a punching template assembly on the workpiece to be machined, wherein a cutter hole is formed in the punching template assembly corresponding to the fingerprint module mounting groove, positioning holes are formed in the punching template assembly corresponding to the alternative cylinders, the alternative cylinders penetrate through the positioning holes, and the punching template assembly is positioned on the workpiece to be machined.
9. The fingerprint hole machining method of claim 8, wherein in the step of placing the punching template assembly on the workpiece to be machined, the punching template assembly comprises a first rigid punching template and a second elastic punching template, the first punching module and the second punching module are connected, and the second punching template protrudes out of the first punching template and faces the workpiece to be machined.
10. A fingerprint hole machining method is characterized by comprising the following steps:
providing a workpiece to be machined, performing in-mold injection molding on the workpiece to be machined, and forming a reference cylinder, wherein the central axis of the reference cylinder is vertical to a datum plane, and the central point of the projection of the reference cylinder on the datum plane is used as a reference point;
measuring the peripheral surface of the cylinder to obtain the actual absolute coordinates of the reference point on the reference surface;
combining preset relative position coordinates to obtain actual absolute coordinates of the circle center of the fingerprint hole to be processed on the reference surface;
processing out concentric fingerprint module mounting groove and fingerprint hole on treating the machined part with the actual absolute coordinate of waiting to process the fingerprint hole centre of a circle that obtains on the datum plane.
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| CN110667033B (en) | 2021-07-27 |
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