CN111531050A - Needle tube type pen point manufacturing equipment - Google Patents

Needle tube type pen point manufacturing equipment Download PDF

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Publication number
CN111531050A
CN111531050A CN202010161421.8A CN202010161421A CN111531050A CN 111531050 A CN111531050 A CN 111531050A CN 202010161421 A CN202010161421 A CN 202010161421A CN 111531050 A CN111531050 A CN 111531050A
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CN
China
Prior art keywords
truncated cone
shaped cavity
ball
limiting plate
pen point
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Pending
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CN202010161421.8A
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Chinese (zh)
Inventor
林大喜
郭亨长
胡东红
林桢
姚鸿俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wenzhou Wenxing Pen Co ltd
Hubei University
Shanghai M&G Stationery Inc
Original Assignee
Wenzhou Wenxing Pen Co ltd
Hubei University
Shanghai M&G Stationery Inc
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Application filed by Wenzhou Wenxing Pen Co ltd, Hubei University, Shanghai M&G Stationery Inc filed Critical Wenzhou Wenxing Pen Co ltd
Priority to CN202010161421.8A priority Critical patent/CN111531050A/en
Publication of CN111531050A publication Critical patent/CN111531050A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/04—Reducing; Closing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/04—Movable or exchangeable mountings for tools

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pens And Brushes (AREA)

Abstract

The invention discloses a needle tube type pen point manufacturing device which is used for reducing the diameter of a needle tube type pen point and comprises a truncated cone-shaped cavity (4), an upper limiting disc (2), a lower limiting disc (3) and a ball (1), wherein the upper limiting disc and the lower limiting disc are respectively arranged on the truncated cone-shaped cavity from two ends of the truncated cone-shaped cavity along the central axis (I) of the truncated cone-shaped cavity, so that an insertion channel (23) for inserting the needle tube pen point is formed along the central axis, the ball is arranged to move in a ball movement space formed by the upper limiting disc, the lower limiting disc and the truncated cone-shaped cavity and is used for extruding the pen point in a rolling manner around the central axis to uniformly reduce the diameter of the pen point, the truncated cone-shaped cavity is arranged to be capable of rotating to drive the ball to roll, and the inner diameter of the part of the truncated cone-shaped cavity, which is contacted with the ball, limits the radius of the rolling track of the ball, thereby determining the outer diameter of the needle tube nib after reducing.

Description

Needle tube type pen point manufacturing equipment
Technical Field
The invention relates to pen point manufacturing equipment, in particular to needle tube pen point manufacturing equipment.
Background
An important procedure in the manufacture of needle-type tips is diameter reduction. The traditional undergauge mode of needle tubing nib is the mould extrusion, sets up a mould promptly earlier, then reaches the purpose of undergauge through the extrusion with the pipe material in mould one end, however, this kind of mould extruded mode causes the pipe material surface not smooth easily, easily the deckle edge appears. Moreover, different reducing sizes require different forming dies, which is inconvenient to use and increases the cost.
In addition, many nib manufacturing equipment on the market easily produce metal debris and remain in the production process, influence follow-up processingquality.
Therefore, in order to improve the production quality and reduce the production cost, a brand new needle tube type pen point manufacturing device needs to be developed.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a needle tube type pen point manufacturing device, which can improve the smoothness of the diameter-reduced surface of the needle tube type pen point and reduce the generation of burrs.
In order to achieve the purpose, the invention adopts the following technical scheme:
a needle tube type pen point manufacturing device is used for reducing the diameter of a needle tube pen point and comprises a truncated cone-shaped cavity, an upper limiting plate, a lower limiting plate and a ball, the upper limiting disc and the lower limiting disc are respectively installed on the truncated cone-shaped cavity from two ends of the truncated cone-shaped cavity along the central axis of the truncated cone-shaped cavity, so that an insertion channel for inserting a pen point of the needle tube is formed along the central axis, the ball is arranged to move in a ball movement space formed by the upper limiting disc, the lower limiting disc and the truncated cone-shaped cavity, used for extruding the needle tube pen point in a rolling way around the central axis to ensure that the needle tube pen point is uniformly reduced in diameter, the truncated cone-shaped cavity is arranged to be capable of rotating to drive the ball to roll, the inner diameter of the contact part of the truncated cone-shaped cavity and the ball defines the radius of the rolling track of the ball, so that the reduced outer diameter of the needle tube nib is determined.
Further, the truncated cone shaped cavity has a conical inner cavity side and a cylindrical outer peripheral side around the central axis, the inner cavity side for contacting the ball to define a radius of a rolling trajectory of the ball.
Further, go up spacing dish top center and be equipped with the annular round platform of spacing dish of bellied down, it is formed with central through-hole to go up spacing dish annular round platform, it is equipped with the annular round platform of spacing dish of bellied lower limit down to go up spacing dish top center down, it is formed with central through-hole to go up spacing dish annular round platform with the central through-hole of spacing dish annular round platform down forms jointly insert the passageway, just go up the lower terminal surface of spacing dish annular round platform with the up end of spacing dish annular round platform down with the round platform shape cavity the inner chamber side is injectd together ball motion space.
Furthermore, a semi-open hollow circular upper limiting disc cylindrical cavity is formed in the upper limiting disc and used for receiving the upper end of the truncated cone-shaped cavity, and a semi-open hollow circular lower limiting disc cylindrical cavity is formed in the lower limiting disc and used for receiving the lower end of the truncated cone-shaped cavity.
Further, the distance between the lower end surface of the upper limiting disc annular circular truncated cone and the upper end surface of the lower limiting disc annular circular truncated cone is slightly larger than the diameter of the ball.
Further, the truncated cone-shaped cavity and the upper limiting disc are releasably locked through a locking bolt, and the outer ring of the truncated cone-shaped cavity and the outer ring of the lower limiting disc are releasably locked through another locking bolt, so that the relative positions of the upper limiting disc, the lower limiting disc and the truncated cone-shaped cavity can be adjusted through the locking bolts, and the radius of the rolling track of the ball is adjusted.
Furthermore, the top of the upper limiting disc is in a hollow screen mesh shape, and the bottom of the lower limiting disc is in a hollow screen mesh shape and used for discharging metal chips generated in the production process along with the jet flow of the cooling liquid.
Further, the manufacturing equipment includes a plurality of the beads.
Further, when the needle tube is in a working state, the axis of the needle tube pen point is superposed with the central axis of the circular truncated cone-shaped cavity.
A needle tubing pen point, the pen point is manufactured by any manufacturing equipment.
The invention provides a needle tube type pen point manufacturing device, which is used for reducing the diameter of a pen point tube material by rotating and extruding a ball around a pen point at a high speed, and the diameter-reduced tube material has a smooth surface, is not easy to generate burrs and has accurate size. Moreover, the adjustment of the diameter reduction size can be realized by adjusting the positions of the upper limiting disc and the lower limiting disc relative to the truncated cone-shaped inner cavity. In addition, the upper limiting disc and the lower limiting disc which are hollowed out can discharge metal chips generated in the diameter reducing process along with the jet flow of the cooling liquid, so that the damage of the metal chips generated in the traditional diameter reducing process to manufacturing equipment and the deterioration of the diameter reducing quality are avoided.
Drawings
The foregoing technical disclosure as well as the following detailed description of the present invention will be better understood when read in conjunction with the appended drawings. It is to be noted that the figures are only intended as examples of the claimed solution. In the drawings, like reference characters designate the same or similar elements.
FIG. 1 is a schematic diagram illustrating the relationship between the geometric structure of a truncated cone-shaped cavity, the radius of a ball, and a ball constraint circle according to an embodiment of the present invention;
FIG. 2 is a schematic view of the relationship of the radius of the constraint circle, the radius of the ball and the radius of the reducer in normal use in accordance with one embodiment of the present invention;
FIG. 3 is a schematic diagram of the relationship between the minimum allowable ball radius R1min and the maximum diameter reducer radius R2max while constraining the radius R0 according to one embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the relationship between the maximum allowable ball radius R1max and the minimum diameter reducer radius R2min for a constrained circle radius R0 according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of a vertical cross-sectional structure of the manufacturing equipment of the stylus type pen tip according to the embodiment of the present invention.
Wherein the reference numerals are as follows:
1 ball
2 upper limiting disc
21 upper limiting disc cylindrical cavity
22 upper limit disc ring-shaped round platform
23 into the channel
3 lower limiting disc
31 lower limiting disc cylindrical cavity
32 lower limit disc annular round table
4 round platform shaped cavity
5 locking bolt
I central axis
Detailed Description
The detailed features and advantages of the invention are described in the following detailed description, which is sufficient to enable one skilled in the art to understand the technical content of the invention and to implement the invention, and the related objects and advantages of the invention can be easily understood by one skilled in the art from the description, the claims and the accompanying drawings.
Fig. 5 shows the equipment for manufacturing the needle tube type pen point of the embodiment of the invention, which comprises a truncated cone-shaped cavity 4, a lower limiting plate 3, an upper limiting plate 2, a locking bolt 5 and a ball 1. It is to be understood that "upper", "lower", "inner" and "outer" as used herein are described with reference to the orientation shown in fig. 5.
The upper limiting plate 2 and the lower limiting plate 3 are respectively mounted on the truncated cone-shaped cavity 4 from both ends of the truncated cone-shaped cavity 4 along the central axis I of the truncated cone-shaped cavity 4, so that an insertion channel 23 for inserting the pen point of the needle tube is formed along the central axis I. The ball 1 is arranged to move in a ball movement space formed by the upper limiting disc 2, the lower limiting disc 3 and the truncated cone-shaped cavity 4 and is used for extruding the pen point of the needle tube around the central axis I in a rolling mode to enable the pen point to be uniformly reduced in diameter. The truncated cone-shaped cavity 4 is arranged to rotate to drive the ball 1 to roll, and the inner diameter of the part of the truncated cone-shaped cavity 4 contacted with the ball 1 limits the radius of the rolling track of the ball 1, thereby determining the outer diameter of the reduced diameter of the needle tube pen point.
The truncated cone-shaped cavity 4 is in a central through shape, is symmetrical around a central axis I, and has a conical inner cavity side surface and a cylindrical outer peripheral side surface around the central axis I. The conical inner chamber side essentially forms the truncated cone-shaped inner chamber of the truncated cone-shaped chamber 4. The lumen side 1 is in contact with the ball 1, thereby defining the radius of the rolling trajectory of the ball 1. The conical inner cavity side surface can adjust the radius of the rolling track of the ball by changing the contact part of the inner cavity side surface and the ball 1, thereby adjusting the reduced outer diameter of the pen point of the needle tube. Of course, it will be appreciated that the sides of the cavity may have other shapes as desired, such as an arcuate taper, or may be straight cylindrical without the need to adjust the radius of the ball rolling trajectory.
The lower limiting disc 3 is arranged at the lower part of the round table-shaped cavity 4. The lower limiting disc 3 is a hollow cylinder with an open upper part and is provided with a lower limiting disc cylindrical cavity 31, and the inner diameter of the cylindrical cavity 31 is slightly larger than the diameter of the peripheral side surface 42 of the truncated cone-shaped cavity 4, so that the lower limiting disc can be sleeved on the truncated cone-shaped cavity 4. The locking bolt 5 can lock the peripheral wall of the lower limiting disc 3 and the peripheral wall of the truncated cone-shaped cavity 4 in a releasable way so as to realize the adjustable positioning of the lower limiting disc 3 relative to the truncated cone-shaped cavity 4. The bottom of the lower limiting disc 3 is in a hollow screen shape, the center of the bottom is provided with an upward convex lower limiting disc annular circular truncated cone 32, and the lower limiting disc annular circular truncated cone 32 is provided with a central through hole for forming the insertion channel 23. The outer diameter of the annular truncated cone 32 of the lower retainer disc is smaller than the inner diameter at the lower end of the truncated cone-shaped cavity 4 so that the lower end of the truncated cone-shaped cavity 4 is received in the cylindrical cavity 31 of the lower retainer disc 3.
The upper limiting disc 2 is arranged at the upper part of the round table-shaped cavity 4. The upper limiting disc 2 is a hollow cylinder with an open upper part and is provided with an upper limiting disc cylindrical cavity 21, and the inner diameter of the cylindrical cavity 21 is slightly larger than the diameter of the peripheral side surface of the truncated cone-shaped cavity 4, so that the upper limiting disc can be sleeved on the truncated cone-shaped cavity 4. The locking bolt 5 can lock the outer peripheral wall of the upper limiting disc 2 and the outer peripheral wall of the truncated cone-shaped cavity 4 in a releasable manner, so that the upper limiting disc 2 can be adjustably positioned relative to the truncated cone-shaped cavity 4. The top of the upper limiting disc 2 is in a hollow screen shape, the center of the top is provided with an upper limiting disc annular circular truncated cone 22 protruding downwards, and the upper limiting disc annular circular truncated cone 22 is provided with a central through hole for forming an insertion channel 23. The outer diameter of the annular frustum 22 of the upper limiting disc is smaller than the inner diameter at the upper end of the frustum-shaped cavity 4, so that the upper end of the frustum-shaped cavity 4 is received in the cylindrical cavity 21 of the upper limiting disc 2.
The upper limiting disc annular truncated cone 22 and the lower limiting disc annular truncated cone 32 are opposite to each other in the up-down direction, so that the ball movement space is limited by the lower end face of the upper limiting disc annular truncated cone 22 and the upper end face of the lower limiting disc annular truncated cone 32 and the side face of the inner cavity of the truncated cone-shaped cavity 4. It will be appreciated that the distance between the lower end face of the upper limiting disc annular land 22 and the upper end face of the lower limiting disc annular land 32 may preferably be slightly larger than the diameter of the ball 1, so as to facilitate free rolling of the ball.
In the present embodiment, three balls 1 are provided, and the three balls 1 are all disposed between the upper limiting disc annular truncated cone 22 and the lower limiting disc annular truncated cone 32. Of course, other numbers of beads may be used as desired.
When the needle tube type pen point manufacturing equipment is used for processing the needle tube type pen point, the axis of the needle tube type pen point is superposed with the central axis I of the truncated cone-shaped cavity 4, the truncated cone-shaped cavity 4 rotates at a high speed, the needle tube type pen point extends into the insertion channel 23 along the central axis I, and the diameter reduction of the outer diameter of the needle tube type pen point is realized under the rolling extrusion effect of the three balls 1.
As shown in figure 1, the ball 1 is provided with an upper limit disc annular round platform 22, a lower limit disc annular round platform 32 and a reducing radius R of a pen point needle tube2Under the combined action of the three balls 1, the three balls 1 are tightly attached to the inner wall of the truncated cone-shaped cavity 4, the central axis of the truncated cone-shaped cavity 4 and the center of the ball 1 form a plane screenshot, the central axis of the truncated cone-shaped cavity 4 is taken as a Y axis, the straight line of the diameter of the bottom of the truncated cone-shaped cavity 4 is taken as an X axis, and the radius of the bottom of the truncated cone-shaped inner cavity of the truncated cone-shaped cavity 4 is L0The included angle between the inner cavity generatrix of the circular truncated cone-shaped cavity 4 in the XOY plane and the X axis is βThe radius of the ball 1 is R1, the coordinates of the center of the ball 1 are (x, y), and the following relationship is given:
x＝R2+R1(1.1)
Figure BDA0002405930950000051
the center of the ball 1 is crossed to make a straight line parallel to the X axis, and the coordinate of the intersection point of the straight line and the left side of the circumference of the ball 1 is recorded as (R)0Y), the coordinates of the tangent point between the ball 1 and the inner wall of the truncated cone-shaped cavity 4 are (Lx, Ly), and the following relationship is given:
Figure BDA0002405930950000052
Lx＝R2+R1(1+sinβ) (2.2)
Ly＝y+R1cosβ (2.3)
wherein R is0Is equal to three radii of R1The radius of the constraining circle tangent to the ball circle of (a) is shown in fig. 2.
In FIG. 2, three radii are R1The ball circle has a radius of R0Under the constraint of the constraint circle, the pen point of the needle tube is extruded to obtain the pen point of the needle tube which is reduced to the radius R2The circle of (c). The following relationships exist:
R0＝R2+2R1(3)
from the formulae (2) and (3)
Figure BDA0002405930950000061
That is, for the inner wall of the truncated cone-shaped cavity 4 shown in FIGS. 1 and 2, when the radius of the ball 1 is R1When the upper limiting disc 2 and the lower limiting disc 3 limit the ball 1 at the position with the coordinate of the center of the ball as y, the reduced diameter size R can be processed2The reducing needle tube pen point.
As can be seen from the equations in FIGS. 2 and 3, for a given bead radius R1And the radius of the reducing circle R2As long as the constrained circle radius R is obtained0Can realize diameter reductionTo a radius of circle R2The required constrained circular radius R can be obtained by adjusting the position of the ball in the Y direction in the truncated cone-shaped cavity according to the formula (2.1)0。
To be processed into a radius of R2If the diameter of the ball 1 is R1Too small, there is a possibility that 3 beads 1 are all located on the reduced diameter circle side. As shown in FIG. 3, the radius of the ball 1 is R1minThe left and right balls 1 are tangent to the middle ball 1 at the same time, the three balls 1 are tangent to the constraint ring, the circle center line passes through the circle center of the constraint ring, and the radius of the ball is the minimum radius R of the ball1minThe corresponding radius of the constraint circle is the minimum radius of the constraint circle R0minIf the bead radius is smaller, there is a possibility that 3 beads are all located at the lower part of the reduced diameter circle, and the reduced diameter circle cannot be press-worked. Thus, in practical use, for a given reduced diameter radius R2Radius of ball R1Should be greater than R1minThe radius of the circle R is constrained accordingly0Should be greater than R0min。
R0min、R1minAnd R2The following conditions are satisfied:
R0min＝2R1min+R2(5)
Figure BDA0002405930950000062
the formula (5) and (6) can be used for obtaining:
Figure BDA0002405930950000063
Figure BDA0002405930950000064
similarly, for a given reduced diameter circle radius R2If the radius of the ball is too large, as shown in FIG. 4, when 3 balls 1 are tangent, the reducing circle is tangent to 3 ball circles, and the radius of the ball is R1maxThe corresponding radius of the constraint circle is R0max. If the radius of the ball is larger thanR1maxThen, the machining radius is not R2The diameter reduction circle of (2). R0max、R1maxAnd R2The following relationship is satisfied:
R0max＝2R1max+R2(9)
Figure BDA0002405930950000071
the formula (9) and (10) can be used for obtaining:
Figure BDA0002405930950000072
Figure BDA0002405930950000073
for a given minimum reduction radius R2minAnd the maximum radius of reduction R2maxThe corresponding minimum bead diameter R can be calculated from the expressions (7) and (11)1minAnd maximum bead diameter R1maxSelecting and determining the proper ball radius R in the range1。
An angle of β (about 80 degrees) is specified, and the maximum diameter reduction radius R for machining is calculated according to the formula (2.2)2minCorresponding LxIs marked as L0(ii) a Calculating the minimum diameter reducing radius R2minCorresponding LxIs marked as L1(ii) a Wherein L is0I.e. the inner cavity bottom circle radius L of the truncated cone-shaped cavity 41Namely the top circle radius of the inner cavity of the truncated cone-shaped cavity 4. The height H of the inner cavity of the truncated cone-shaped cavity 4 is as follows:
H＝(L0-L1)tanβ (13)
after the shape of the truncated-cone-shaped cavity 4 is determined, for R2minTo R2maxRadius reduction machining requirement R2According to the formula (1.2), the height position coordinate y of the circle center of the ball 1 in the cavity can be calculated, the positions of the upper limiting disc and the lower limiting disc are adjusted accordingly, the circle center position of the ball 1 is positioned at the height position y in the truncated cone-shaped cavity 4, and the diameter-reducing radius R can be processed2The needle tube pen point.
In one example:
calculating the corresponding minimum ball diameter R according to the formulas (7) and (11) according to the diameter-reducing circle radius R2 of the needle tube nib in diameter reducing processing of 0.2-0.36 mm1minAnd maximum bead diameter R1maxAs shown in table 1:
TABLE 1 reducing circle radius R2Corresponding minimum ball radius R1minAnd maximum bead radius R1max
Figure BDA0002405930950000074
Figure BDA0002405930950000081
As can be seen from Table 1, in order to process a reducing circle with a radius of 0.3 mm, the radius of the ball should be 0.724-1.939 mm; in order to process a reducing circle with the radius of 0.7mm, the radius of the ball should be 1.69-4.525 mm.
Because the ball radius is too small and is easily worn, the ball with the largest radius is selected according to the ball radius range, and the ball radius R1 is 1.939mm in table 1, so that a diameter-reduced circle with the radius of 0.3-0.7 mm can be processed.
Selecting the beta angle as 85 degrees, and calculating the reducing circle with the processing radius of 0.3-0.4 mm, wherein the Lx value is 4.171-4.571 mm, namely, the inner diameter range of the truncated cone-shaped cavity is 4.171-4.571 mm, and the corresponding height of the truncated cone-shaped cavity can be calculated to be 4.572mm according to the formula (13).
In practical applications, further adjustment is often required near the height position y according to the trial machining result.
The terms and expressions which have been employed herein are used as terms of description and not of limitation. The use of such terms and expressions is not intended to exclude any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications may be made within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims should be looked to in order to cover all such equivalents.
Also, it should be noted that although the present invention has been described with reference to the current specific embodiments, it should be understood by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes or substitutions may be made therein without departing from the spirit of the present invention, and therefore, it is intended that all changes and modifications to the above embodiments within the spirit of the present invention shall fall within the scope of the appended claims.

Claims (10)

1. A needle tube type pen point manufacturing device is used for reducing the diameter of a needle tube pen point and is characterized by comprising a truncated cone-shaped cavity (4), an upper limiting disc (2), a lower limiting disc (3) and a ball (1),
the upper limiting plate and the lower limiting plate are respectively installed on the truncated cone-shaped cavity from two ends of the truncated cone-shaped cavity along the central axis (I) of the truncated cone-shaped cavity, so that an insertion channel (23) for inserting a pen point of the needle tube is formed along the central axis,
the ball is arranged to move in a ball movement space formed by the upper limiting disc, the lower limiting disc and the truncated cone-shaped cavity and is used for extruding the pen point of the needle tube in a rolling manner around the central axis to uniformly reduce the diameter of the pen point,
the truncated cone-shaped cavity is arranged to rotate to drive the ball to roll, and the radius of the rolling track of the ball is limited by the inner diameter of the part of the truncated cone-shaped cavity, which is in contact with the ball, so that the reduced outer diameter of the pen point of the needle tube is determined.
2. The stylus-type pen tip manufacturing equipment of claim 1, wherein the truncated cone-shaped cavity has a conical inner cavity side and a cylindrical outer peripheral side around the central axis, the inner cavity side for contacting the ball to define a radius of a rolling trajectory of the ball.
3. The needle tube type pen point manufacturing equipment according to claim 2, characterized in that an upper limiting plate annular circular truncated cone (22) protruding downwards is arranged at the center of the top of the upper limiting plate, a central through hole is formed in the upper limiting plate annular circular truncated cone, an upper limiting plate annular circular truncated cone (32) protruding upwards is arranged at the center of the top of the lower limiting plate, a central through hole is formed in the lower limiting plate annular circular truncated cone, the upper limiting plate annular circular truncated cone and the central through hole of the lower limiting plate annular circular truncated cone jointly form the insertion channel, and the ball movement space is defined by the lower end face of the upper limiting plate annular circular truncated cone and the upper end face of the lower limiting plate annular circular truncated cone together with the inner cavity side face of the circular truncated cone-shaped cavity.
4. The needle-tube type pen tip manufacturing equipment according to claim 3, characterized in that the upper limiting plate forms inside a semi-open hollow circular upper limiting plate cylindrical cavity (21) for receiving the upper end of the truncated cone-shaped cavity, and the lower limiting plate forms inside a semi-open hollow circular lower limiting plate cylindrical cavity (31) for receiving the lower end of the truncated cone-shaped cavity.
5. The stylus type pen point manufacturing equipment according to claim 3, wherein the distance between the lower end surface of the upper limiting disk annular truncated cone and the upper end surface of the lower limiting disk annular truncated cone is slightly larger than the diameter of the ball.
6. The needle-tube type pen tip manufacturing equipment according to claim 2, characterized in that the truncated cone-shaped cavity and the upper limiting plate are releasably locked by a locking bolt (5), and the truncated cone-shaped cavity and the outer ring of the lower limiting plate are releasably locked by another locking bolt (5), so that the relative position between the upper limiting plate and the lower limiting plate and the truncated cone-shaped cavity can be adjusted by the locking bolts, thereby adjusting the radius of the rolling track of the ball.
7. The needle tube type pen point manufacturing equipment of claim 1, wherein the top of the upper limiting disc is in a hollowed-out screen mesh shape, and the bottom of the lower limiting disc is in a hollowed-out screen mesh shape, so that metal chips generated in a production process can be discharged along with a cooling liquid jet flow.
8. The needle-type pen point manufacturing equipment according to claim 1, characterized in that it comprises a plurality of said balls.
9. The needle-type pen point manufacturing equipment according to claim 1, characterized in that, in the working condition, the axis of the needle-type pen point coincides with the central axis of the truncated-cone-shaped cavity.
10. A needle-cannula nib characterized in that it is manufactured with nib manufacturing equipment according to any one of claims 1 to 9.
CN202010161421.8A 2020-03-10 2020-03-10 Needle tube type pen point manufacturing equipment Pending CN111531050A (en)

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