Method for producing blood taking needle and progressive stamping die adopted by same

Abstract

The invention provides a method for producing a blood taking needle, which is characterized in that a plate is placed in a progressive stamping die, and the method comprises the following steps of: S1, blanking the outer edge contour of the blood taking needle; s2, punching a needle blade part; s3, punching the outer edge contour of the bottom of the needle rod; s4, deep drawing; and S5, blanking. The invention further provides a progressive stamping die for producing the blood taking needle, the progressive stamping die comprises a needle head die used for stamping a needle head blade part, the needle head die comprises an upper die punch and a lower die cavity, a boss is arranged on the lower end face of the upper die punch, a needle head blade stamping female die is arranged on one side edge of the boss, and the needle head blade stamping female die is arranged on the other side edge of the boss. The needle blade stamping female die comprises a female die side blade face and a female die chisel blade. According to the method for producing the blood taking needle and the progressive stamping die adopted by the method, the blood taking needle is produced through stamping machining, the production efficiency is improved, the product precision is improved, and the automation degree is high.

Description

Technical Field

[0001] The invention belongs to the field of blood collection needle processing, and in particular relates to a method for producing a blood collection needle and a progressive stamping die used therein. Background Art

[0002] Progressive stamping dies are stamping dies that can complete multiple stamping processes at different positions of the die in sequence during one stroke. The traditional die structure is an eight-plate structure or a nine-plate structure. The eight plates are the upper and lower die bases, the punch fixing plate, the punch pad, the die fixing plate, the die pad, the discharge plate, and the discharge pad; the nine-plate structure is to add a guide plate. In a progressive stamping die, the parts can be punched, flanging, bending, drawing, three-dimensional forming and other processes.

[0003] At present, medical needles include U-shaped blood collection needles, which are used to collect blood from diabetic patients and pierce the skin to collect blood samples. The processing method for producing medical needles usually includes steps such as tube rolling, welding, needle tip forming, polishing and punching. The processing steps of traditional needles are relatively large and the processing efficiency is relatively low. Summary of the invention

[0004] In view of this, the present invention aims to propose a method for producing a blood collection needle and a progressive stamping die used therein, which are completed through stamping processing, have a high degree of automation, improve production efficiency, and improve product precision.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows: The present invention provides a method for producing a blood collection needle, wherein a plate is placed in a progressive stamping die, and the method comprises the following steps implemented in sequence: S1. Punch out the outer edge contour of the blood collection needle. Punch and cut from opposite sides of the blood collection needle. Punch out the tip of the needle by overlapping and cross punching. After punching, separate the needle and the needle rod from the plate, and keep the bottom of the needle rod connected to the plate; S2, stamping the needle tip, placing the outer edge contour of the blood collection needle in a stamping cavity formed by the progressive stamping die when the die is closed, and then applying pressure to the needle tip; S3, punching out the outer edge contour of the bottom of the needle bar, punching and cutting from both sides of the bottom of the needle bar, and only retaining the connection between the bottom of the needle bar and the plate; S4, drawing, drawing the needle head and the needle rod into a needle blank with a U-shaped side wall; S5, blanking, separating the needle blank from the plate along the connecting portion.

[0006] Furthermore, the following steps are included between step S3 and step S4: Step S301 is shaping, punching downward, and applying pressure to the plate material of the outer edge contour of the blood collection needle.

[0007] Furthermore, the plate is in the shape of an elongated strip as a whole, and upwardly extending bending portions are arranged along both sides of its long sides.

[0008] Furthermore, in the step S1, when punching from opposite sides of the blood collection needle respectively, the length of the punch needle blade is greater than the length of the blood collection needle blade.

[0009] Furthermore, in the step S2, the stamping cavity is composed of an upper die punch and a lower die cavity, and the upper die punch can cooperate to be stamped into the lower die cavity to form a stamping cavity.

[0010] The present invention also provides a progressive stamping die for producing blood collection needles, the progressive stamping die includes a needle die for stamping the needle blade, the needle die includes an upper die punch and a lower die cavity, a boss is arranged on the lower end surface of the upper die punch, a needle blade stamping die is arranged on one side of the boss, the needle blade stamping die includes a die side blade surface and a die transverse blade, the upper ends of the die side blade surfaces intersect to form a die transverse blade; a groove is arranged on the upper end surface of the lower die cavity, a needle blade stamping punch is arranged on one side of the groove, the needle blade stamping punch has the same shape as the needle blade stamping die, and the boss can be stamped into the groove.

[0011] Furthermore, the width of the side blade surface is greater than the thickness of the plate.

[0012] Furthermore, the needle blade stamping punch shown includes a punch side blade surface and a punch transverse blade, the front ends of the two punch side blade surfaces intersect to form a punch transverse blade; the inclination angle of the punch side blade surface is consistent with that of the die side blade surface; the inclination angle of the punch transverse blade is consistent with that of the die transverse blade.

[0013] Furthermore, the needle mold includes an upper mold assembly and a lower mold assembly, the upper mold assembly includes an upper mold base, an upper pad, an upper clamping plate, a stop plate and a stripping plate arranged from top to bottom, and the lower mold assembly includes a lower mold base, a lower pad and a lower mold plate arranged from bottom to top, the upper mold punch is connected to the upper mold base through the upper pad, and the lower mold cavity is connected to the lower mold base through the lower pad.

[0014] Compared with the prior art, the method for producing a blood collection needle and the progressive stamping die used in the present invention have the following advantages: (1) The method for producing a blood collection needle described in the present invention includes punching out the outer edge contour of the blood collection needle, punching out the blade of the needle head, punching out the outer edge contour of the bottom of the needle rod, drawing and blanking through a progressive stamping die, so as to produce a blood collection needle head, which can realize the function of the blood collection needle and realize mass production, thereby improving production efficiency.

[0015] (2) The progressive stamping die for producing blood collection needles described in the present invention can stamp the needle tip through the needle tip die, thereby ensuring the sharpness of the needle tip, realizing the function of the blood collection needle, and improving production efficiency; it can replace the current processing method for producing blood collection needle tips, including realizing mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of a progressive stamping die stamping a plate according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the bending portion structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the punch needle blade according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the needle mold structure according to an embodiment of the present invention; Figure 5 It is a schematic diagram of the structure of the upper die punch according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the lower mold cavity structure according to an embodiment of the present invention; Figure 7 Schematic diagram of the structure of a U-shaped blood collection needle according to an embodiment of the present invention.

[0017] Description of reference numerals: 1-plate; 2-first blanking plate; 3-second blanking plate; 4-needle tip; 5-needle rod; 6-needle rod bottom; 7-needle blade; 8-right area of ​​needle rod bottom; 9-left area of ​​needle rod bottom; 10-connecting part; 11-needle blank; 12-through hole; 13-axial groove; 14-radial groove; 15-plate of outer edge contour of blood collection needle; 16-bending part; 17-needle rod; 18-needle; 20-punch needle blade; 21-blood collection needle blade; 22-upper die punch; 23-lower die cavity; 25-upper mold base; 26-upper pad; 27-upper clamping plate; 28-stop plate; 29-stripping plate; 30-lower mold plate; 31-lower pad; 32-lower mold base; 40-boss; 41-die side blade surface; 42-die cross blade; 43-groove; 44-punch side blade surface; 45-punch cross blade. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0019] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0020] like Figure 7 As shown, this embodiment takes a U-shaped blood collection needle as an example. The U-shaped blood collection needle includes a needle 18 and a needle shaft 17. The needle 18 includes a needle blade 7 and a needle tip 4. The needle tip 4 is composed of two intersecting needle blades 7. The cross-section of the needle shaft of the U-shaped blood collection needle is U-shaped as a whole.

[0021] The method for producing a blood collection needle and the progressive stamping die used therein include placing a sheet in the progressive stamping die, and comprising the following steps implemented in sequence: like Figure 1 As shown, S1, punch out the outer edge contour of the blood collection needle, and punch and cut from the opposite sides of the blood collection needle respectively during punching. The needle head adopts overlapping and cross punching to punch out the tip of the needle head. After punching, the needle head and the needle rod are separated from the plate, and the connection between the bottom of the needle rod and the plate is maintained; wherein, during punching, the blood collection needle is punched and cut from the opposite sides of the blood collection needle respectively, the first blanking plate 2 is punched on one side, and the second blanking plate 3 is punched on the other side. The needle tip of the first blanking plate 2 overlaps and crosses with the second blanking plate 3 to punch out the needle tip 4; after punching, the needle head blank and the needle rod blank are separated from the plate 1, and the connection between the bottom 6 of the needle rod and the plate 1 is maintained; like Figure 1 As shown, S2, the stamping needle blade 7, the outer edge contour of the blood collection needle is placed in a stamping cavity formed by the progressive stamping mold when the mold is closed, and then pressure is applied to the needle blade; wherein, the stamping cavity used for stamping the needle blade 7 is composed of an upper die punch and a lower die cavity cooperating with each other.

[0022] S3, punch out the outer edge contour of the bottom of the needle bar, punch and cut from both sides of the bottom of the needle bar, and only keep the connection between the bottom of the needle bar and the plate; Figure 1 As shown, the right area 8 and the left area 9 of the bottom of the needle rod are punched out from both sides of the bottom of the needle rod to retain the connecting portion 10. Step S3 completes punching out the outer edge contour of the bottom of the needle rod, and thus the outer edge contour of the blood collection needle is completed.

[0023] like Figure 1 As shown, step S4, deep drawing, drawing the needle head and the needle rod into a needle blank 11 with a U-shaped side wall; after completing the outer edge contour of the blood collection needle, the blood collection needle is deep drawn and formed; step S5, blanking, separating the needle blank 11 from the plate 1 along the connecting portion 10.

[0024] like Figure 1As shown, the following steps are also included between step S3 and step S4: step S301, shaping, punching downward, applying pressure to the plate 15 of the outer edge contour of the blood collection needle; through step S301, shaping, before the deep drawing process in step S4, the plate 15 of the outer edge contour of the blood collection needle can also be stamped and shaped, and the stamping shaping includes axial grooves 13, radial grooves 14 or through holes 12, and blood collection needles with axial grooves, radial grooves or through hole structures on the side walls can be processed.

[0025] like Figure 2 As shown, the plate 1 is in the shape of a long strip as a whole, and upwardly extending bending parts 16 are arranged along both sides of the long sides thereof. The bending parts 16 are added on both sides of the plate 1 to further support the more stable feeding of the 0.05 thick plate.

[0026] like Figure 3 As shown, in step S1, when punching from opposite sides of the blood collection needle, the length of the punch needle blade 20 is greater than the length of the blood collection needle blade 21. In step S1, by increasing the length of the punch needle blade to be greater than the length of the blood collection needle blade, the tip of the blood collection needle is punched out when punching from both sides.

[0027] In step S2, the punching cavity is formed by an upper die punch and a lower die cavity, and the upper die punch can cooperate with the punching into the lower die cavity to form a punching cavity. In step S2, the upper die punch can cooperate with the punching into the lower die cavity, so that the upper die punch is punched downward for a certain distance to ensure the sharpness of the punching needle blade.

[0028] like Figure 5 and Figure 6 As shown, this embodiment also provides a progressive stamping die for producing blood collection needles to realize the above-mentioned method for producing blood collection needles, wherein, for realizing the step S2 of stamping the needle blade, the progressive stamping die includes a needle mold for stamping the needle blade, the needle mold includes an upper die punch 22 and a lower die cavity 23, a boss 40 is arranged on the lower end surface of the upper die punch 22, a needle blade stamping die is arranged on one side of the boss 40, the needle blade stamping die includes a die side blade surface 41 and a die transverse blade 42, and the front end of the die side blade surface 41 intersects to form a die transverse blade 42; a groove 43 is arranged on the upper end surface of the lower die cavity 23, a needle blade stamping punch is arranged on one side of the groove 43, the needle blade stamping punch has the same shape as the needle blade stamping die, and the boss 40 can be stamped into the groove 43.

[0029] The working principle of a progressive stamping die for producing blood collection needles in this embodiment is that when the mold is closed, the upper die punch 22 punches downward, the boss 40 punches into the groove 43, and the needle is punched out by the die side blade surface 41 and the die cross blade 42; and, after punching out the sheet, the die side blade surface 41 continues to move downward and punches into the groove 43, which can improve the sharpness of the needle blade 7.

[0030] like Figure 5 and Figure 6 As shown, the width of the side blade surface 41 is greater than the thickness of the plate 1. The needle blade stamping punch shown includes a punch side blade surface 44 and a punch transverse blade 45. The front ends of the two punch side blade surfaces 44 intersect to form a punch transverse blade; the punch side blade surface 44 and the die side blade surface 41 have the same inclination angle; the punch transverse blade 45 and the die transverse blade 42 have the same inclination angle. The boss 40 can be punched into the groove 43, and the die side blade surface 41 continues to move downward after punching the thickness of the plate downward, and punches into the groove 43, which can improve the sharpness of the needle blade 7.

[0031] like Figure 4 As shown, the needle mold includes an upper mold assembly and a lower mold assembly, the upper mold assembly includes an upper mold base 25, an upper pad 26, an upper clamping plate 27, a stop plate 28 and a stripper plate 29 arranged from top to bottom, and the lower mold assembly includes a lower mold base 32, a lower pad 31 and a lower mold plate 30 arranged from bottom to top, the upper mold punch 22 is connected to the upper mold base 25 through the upper pad 26, and the lower mold cavity 23 is connected to the lower mold base 32 through the lower pad 31.

[0032] The present invention provides a method for producing a blood collection needle and a progressive stamping die used therein, which rationally utilizes the stamping process, breaks the traditional blood collection needle processing technology, and innovates a new production process for blood collection needles, thereby ensuring functionality and improving production efficiency.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for producing a blood collection needle, placing a plate in a progressive stamping die, characterized in that , including the following steps implemented in sequence: S1. Punch out the outer edge contour of the blood collection needle. Punch and cut from opposite sides of the blood collection needle. Punch out the tip of the needle by overlapping and cross punching. After punching, separate the needle and the needle rod from the plate, and keep the bottom of the needle rod connected to the plate; S2, stamping the needle tip, placing the outer edge contour of the blood collection needle in a stamping cavity formed by the progressive stamping die when the die is closed, and then applying pressure to the needle tip; S3, punching out the outer edge contour of the bottom of the needle bar, punching and cutting from both sides of the bottom of the needle bar, and only retaining the connection between the bottom of the needle bar and the plate; S4, drawing, drawing the needle head and the needle rod into a needle blank with a U-shaped side wall; S5, blanking, separating the needle blank from the plate along the connecting portion.

2. A method for producing a blood collection needle according to claim 1, characterized in that: The following steps are also included between step S3 and step S4: Step S301 is shaping, punching downward, and applying pressure to the plate of the outer edge contour of the blood collection needle.

3. A method for producing a blood collection needle according to claim 1, characterized in that: The plate is in the shape of an elongated strip as a whole, and upwardly extending bending portions are arranged along both sides of its long sides.

4. A method for producing a blood collection needle according to claim 1, characterized in that: In the step S1, when punching out from opposite sides of the blood collection needle respectively, the length of the punch needle blade is greater than the length of the blood collection needle blade.

5. The method for producing a blood collection needle according to claim 1, characterized in that: In the step S2, the stamping cavity is composed of an upper die punch and a lower die cavity, and the upper die punch can cooperate to be stamped into the lower die cavity to form a stamping cavity.

6. A progressive stamping die used in a method for producing a blood collection needle, characterized in that: The progressive stamping die comprises a needle die for stamping a needle blade portion, the needle die comprising an upper die punch (22) and a lower die cavity (23); a boss (40) is arranged on the lower end surface of the upper die punch (22); a needle blade stamping die is arranged on one side of the boss (40); the needle blade stamping die comprises a die side blade surface (41) and a die transverse blade (42); the front ends of the die side blade surface (41) intersect to form a die transverse blade (42); a groove (43) is arranged on the upper end surface of the lower die cavity (23); a needle blade stamping punch is arranged on one side of the groove (43); the needle blade stamping punch has the same shape as the needle blade stamping die; the boss (40) can be stamped into the groove (43) in cooperation.

7. The progressive stamping die used in the method for producing a blood collection needle according to claim 6, characterized in that: The width of the side blade surface (41) is greater than the thickness of the plate (1).

8. The progressive stamping die used in the method for producing a blood collection needle according to claim 6, characterized in that: The needle blade stamping punch comprises a punch side blade surface (44) and a punch transverse blade (45), the front ends of the two punch side blade surfaces (44) intersect to form a punch transverse blade; the punch side blade surface (44) and the die side blade surface (41) have the same inclination angle; the punch transverse blade (45) and the die transverse blade (42) have the same inclination angle.

9. The progressive stamping die used in the method for producing a blood collection needle according to claim 6, characterized in that: The needle mold comprises an upper mold assembly and a lower mold assembly, wherein the upper mold assembly comprises an upper mold base (25), an upper pad (26), an upper clamping plate (27), a stop plate (28) and a stripper plate (29) arranged from top to bottom, and the lower mold assembly comprises a lower mold base (32), a lower pad (31) and a lower mold plate (30) arranged from bottom to top, wherein the upper mold punch (22) is connected to the upper mold base (25) via the upper pad (26), and the lower mold cavity (23) is connected to the lower mold base (32) via the lower pad (31).

Images