A punch structure and eccentric forming method for an eccentric screw

Abstract

The present invention discloses a punch structure for an eccentric screw, wherein the punch comprises a first punch and a second punch, wherein the first punch comprises a first body, an arc-shaped hole arranged at the center of the lower part of the first body, and an ejector pin arranged at the center of the first body, the head of the ejector pin abuts against the arc-shaped hole, and the first punch is used to punch out the prototype of the eccentric screw. The second punch comprises three parts: an upper part, a middle part, and a lower part, wherein the upper part is provided with a protective mechanism, the middle part is the second body, and the lower part is provided with a concave punch hole at the center, and an eccentric downward convex punch block is provided at the top of the punch hole, and the second punch punches out an eccentric screw with fastening and light-shielding functions under the impact of a punch press. The punch designed by the present scheme has a simple structure and is easy to manufacture, thus saving mold costs. The semicircular groove designed at the upper part of the second punch can improve the impact resistance of the second punch and extend the service life of the second punch. The punch designed by the present scheme is convenient for the processing and manufacturing of eccentric screws, thereby improving production efficiency.

Description

Technical Field

[0001] The invention relates to the field of screw production, and in particular to a punch structure and an eccentric forming method of an eccentric screw. Background Art

[0002] In order to avoid certain problems, some electronic products or equipment need to adopt certain measures to solve them. For example, the printer is not allowed to leak light at a specific position, otherwise it will affect the clarity of the print. In order to overcome this problem, a special block is needed, which will increase the cost of materials and assembly hours, and the work efficiency is low.

[0003] In order to overcome the above problems, we developed an eccentric screw and invented a punch structure and an eccentric forming method for the eccentric screw. Summary of the invention

[0004] The invention aims to solve the problem that adding independent baffles to existing printers increases material costs, assembly time, and low work efficiency. Therefore, an eccentric screw punch structure is invented, and its specific solution is as follows:

[0005] A punch structure for an eccentric screw, the punch comprises a first punch and a second punch, wherein the first punch comprises a first body, an arc-shaped hole arranged at the center of the lower part of the first body, and an ejector arranged at the center of the first body, the head of the ejector abuts against the arc-shaped hole, and the first punch is used to punch out the prototype of the eccentric screw. The second punch comprises three parts: an upper part, a middle part, and a lower part, the upper part is provided with a protection mechanism, the middle part is the second body, the lower part is provided with a concave punch hole at the center, and an eccentric downward convex punch block is provided at the top of the punch hole, and the second punch punches out an eccentric screw with fastening and light shielding functions under the impact of a punch press.

[0006] Furthermore, the protection mechanism is a concave semicircular groove arranged at the center of the top of the second punch, and the diameter of the semicircular groove is 5.2 mm.

[0007] Furthermore, the punching hole is divided into two upper and lower concentrically overlapped hollow cylinders, wherein the diameter of the upper cylinder is smaller than the diameter of the lower cylinder; the depth of the punching hole is 1.5±0.05mm.

[0008] Furthermore, the diameter of the upper cylinder is 4.3-4.4 mm, and the diameter of the lower cylinder is 5.9-6.0 mm.

[0009] Furthermore, the punch block is in a hexagonal shape, the diameter of the circumscribed circle of the hexagonal shape is 2.39 mm, and the height of the hexagonal shape is 1.15-1.20 mm.

[0010] Furthermore, the head of the punch block is conical, the top angle of the cone is 143°, and the bottom of the cone is connected to the hexagonal flower shape.

[0011] Furthermore, the distance between the center of the punch block and the center of the punch hole is 0.40 to 0.45 mm.

[0012] Furthermore, a protrusion is provided at the intersection of the center of the punch block and the center of the punch hole and the edge of the upper cylinder. The length of the protrusion is 0.6-0.7 mm, the width is 0.5 mm, and the height is 0.25±0.05 mm.

[0013] Furthermore, the corners and intersections of the upper cylinder and the lower cylinder are provided with inverted arcs.

[0014] Furthermore, the height of the second body is 24.96-24.99 mm, and the diameter is 13.96-13.98 mm. The height of the first body is 44.8-45.0 mm, the main body diameter of the first body is 18.97-19.0 mm, and the bottom diameter of the first body is 20.0±0.05 mm. The depth of the arc-shaped hole is 1.75±0.05 mm, and the hole diameter of the arc-shaped hole is 4.3-4.4 mm. The main body diameter of the ejector pin is 2.35-2.37 mm, the bottom diameter of the ejector pin is 3.35±0.05 mm, and the bottom height of the ejector pin is 8.0±0.1 mm.

[0015] An eccentric forming method for an eccentric screw, using the punch structure of the eccentric screw and a female die matched therewith, is carried out according to the following steps:

[0016] Step 1, loading a low-carbon steel coil with a circular cross section into a cold heading machine;

[0017] Step 2, the low carbon steel is pressed into a straight line after passing through a straightening wheel;

[0018] Step 3, cutting into segments of low carbon steel using scissors;

[0019] Step 4, the segmented low carbon steel is fed into the female die by a feeding rod;

[0020] Step 5, the first punch is aligned with the female die to perform a punching process to obtain a screw blank with a mushroom-shaped upper portion and a polished rod at the lower portion;

[0021] Step 6, the second punch is aligned with the female die to perform a second punching process to obtain an eccentric screw semi-finished product with an eccentric screw head at the upper part and an eccentric polished rod at the lower part;

[0022] Step 7: The ejector pin in the female mold ejects the semi-finished eccentric screw into the receiving box below;

[0023] Step 8, the eccentric screw semi-finished product is inspected for the first time, and the qualified material is transferred to the next process;

[0024] Step 9, install the eccentric screw semi-finished product into the vibration plate;

[0025] Step 10, the semi-finished eccentric screw is sent from the discharge port of the vibration plate through the transmission track and into the thread rolling template by the automatic pushing device;

[0026] Step 11, after the thread rolling process of the dynamic and static thread rolling templates, the eccentric screw finished product is obtained;

[0027] Step 12, the finished eccentric screws automatically fall into the finished product receiving box;

[0028] Step 13, conduct a second inspection on the finished eccentric screws, and transfer qualified materials to the next process;

[0029] Step 14, the eccentric screw finished product is cleaned;

[0030] Step 15, after electroplating, the final eccentric screw product is obtained;

[0031] Step 16, performing final product inspection on the eccentric screw product;

[0032] Step 17, qualified products are put into storage;

[0033] The eccentric screw head described in step 6 is in the shape of two concentric cylinders stacked up and down, the diameter of the upper cylinder is smaller than the diameter of the lower cylinder, a downwardly concave hexagonal screw hole is provided at the top of the eccentric screw head deviating from the center of the circle, and a concave hole is provided at the intersection of the extension line of the line connecting the center of the screwdriver hole and the center of the circle to the edge of the upper cylinder for position marking, and the eccentric polished rod is a cylinder or a triangular prism; a cylindrical cavity or a triangular prism cavity is provided in the female mold described in steps 4, 5, and 6.

[0034] In summary, the technical solution of the present invention has the following beneficial effects:

[0035] This solution solves the problem of adding independent baffles to existing printers, which increases material costs, assembly time, and low work efficiency. Using a punch for an eccentric screw according to this solution, an eccentric screw can be produced. This eccentric screw cleverly utilizes the screw and the eccentric screw head, avoiding the problem of printer light leakage affecting printing clarity, and does not add independent baffles, saving materials and assembly time, while improving work efficiency. The punch designed by this solution has a simple structure and is easy to make, saving the cost of the mold. The semicircular groove designed on the upper part of the second punch can improve the impact resistance of the second punch and extend the service life of the second punch. The punch designed by this solution facilitates the processing and manufacturing of eccentric screws, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only part of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative labor.

[0037] Figure 1 is a cross-sectional structural diagram of the first punch of the present invention;

[0038] Figure 2 is a bottom view of the first punch of the present invention;

[0039] Figure 3 is a three-dimensional diagram of a second punch of the present invention;

[0040] Figure 4 for Figure 3 Sectional view along line AA;

[0041] Figure 5 for Figure 3 Bottom view of

[0042] Figure 6 for Figure 5 Enlarged view of area B in the middle;

[0043] Figure 7 for Figure 4 Structural diagram of the middle C area;

[0044] Figure 8 for Figure 7 Schematic diagram of the inverted arc.

[0045] Description of reference numerals:

[0046] 1-first punch, 2-second punch, 11-first body, 12-arc hole, 13-thrust pin, 14-positioning surface, 21-second body, 22-punch hole, 23-punch block, 24-semicircular groove, 25-upper cylinder, 26-lower cylinder, 27-bump. DETAILED DESCRIPTION

[0047] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] like Figures 1 to 8As shown, a punch structure of an eccentric screw, the punch includes a first punch 1 (that is, the first punch of cold heading processing) and a second punch 2 (that is, the second punch of cold heading processing), wherein the first punch 1 includes a first body 11, an arc-shaped hole 12 arranged at the lower center of the first body 11, and a ejector pin 13 arranged at the inner center of the first body 11, the head of the ejector pin 13 is in contact with (the top of) the arc-shaped hole 12, and the first punch 1 is used to punch out the prototype of the eccentric screw (not shown in the figure). The second punch 2 includes three parts: the upper part, the middle part, and the lower part. The upper part is provided with a protective mechanism, the middle part is the second body 21, and the center of the lower part is provided with an inwardly concave punch hole 22. The top of the punch hole 22 is provided with an eccentric (meaning offset from the center of the punch hole) lower convex punch block 23. Under the impact of a punch press (not shown in the figure), the second punch 2 punches out an eccentric screw (not shown in the figure) with the functions of tightening and light shielding (the eccentric screw prototype punched out in the first punch is punched out in the second punch process). (Note: The first punch 1 and the second punch 2 in this scheme are respectively used to punch the eccentric screw head of the eccentric screw for the first and second punches)

[0049] Furthermore, the protection mechanism is a concave semicircular groove 24 provided at the center of the top of the second punch 2, and the diameter of the semicircular groove 24 is 5.2 mm.

[0050] Furthermore, the punching hole 22 is divided into two upper and lower concentrically overlapped hollow cylinders, wherein the diameter of the upper cylinder 25 is smaller than the diameter of the lower cylinder 26; the depth of the punching hole 22 is 1.5±0.05 mm.

[0051] Furthermore, the diameter of the upper cylinder 25 is 4.3-4.4 mm, and the diameter of the lower cylinder 26 is 5.9-6.0 mm.

[0052] Furthermore, the punch block 23 is in a hexagonal shape, the diameter of the circumscribed circle of the hexagonal shape is 2.39 mm, and the height of the hexagonal shape is 1.15-1.20 mm.

[0053] Furthermore, the head of the punch block 23 is in a cone shape, the top angle of the cone is 143°, and the bottom of the cone is connected to the hexagonal flower shape.

[0054] Furthermore, the distance between the center of the punch block 23 and the center of the punch hole 22 is 0.40 to 0.45 mm.

[0055] Furthermore, a protrusion 27 is provided at the intersection of the center of the punch block 23 and the center of the punch hole 22 and the edge of the upper cylinder 25. The length of the protrusion 27 is 0.6-0.7 mm, the width is 0.5 mm, and the height is 0.25±0.05 mm.

[0056] Furthermore, the corners and intersections of the upper cylinder 25 and the lower cylinder 26 are both provided with inverted arcs (preferably, the arc radius is as follows: Figure 8shown).

[0057] Furthermore, the height of the second body 21 is 24.96-24.99 mm, and the diameter is 13.96-13.98 mm. The height of the first body 11 is 44.8-45.0 mm, the main body diameter of the first body 11 is 18.97-19.0 mm, and the bottom diameter of the first body 11 is 20.0±0.05 mm. The depth of the arc-shaped hole 12 is 1.75±0.05 mm, and the hole mouth diameter of the arc-shaped hole 12 is 4.3-4.4 mm. The main body diameter of the ejector pin 13 is 2.35-2.37 mm, the bottom diameter of the ejector pin 13 is 3.35±0.05 mm, and the bottom height of the ejector pin 13 is 8.0±0.1 mm. A positioning surface 14 is provided on one side of the first body 11 for positioning the first body 11 when it is fixed.

[0058] In the actual processing, the first punch 1 and the second punch 2 (both belong to the male die) of this scheme are both arranged in the horizontal direction and respectively installed in the corresponding punch sleeves of the cold heading machine (that is, the punch press), and together with a female die (not shown in the figure) form a one-die-two-punch processing technology for processing the eccentric screw head and the eccentric screw of the eccentric screw. Since the female die belongs to the prior art, the specific structure and working principle are not described here.

[0059] An eccentric forming method for an eccentric screw, using the punch structure of the eccentric screw and a female die matched therewith, is carried out according to the following steps:

[0060] Step 1, loading a low carbon steel coil with a diameter of 2.22 mm into a cold heading machine;

[0061] Step 2, the low carbon steel is pressed into a straight line after passing through a straightening wheel;

[0062] Step 3, cutting the steel into segments of low carbon steel with a length of 11.5 to 11.6 mm (the length can be determined according to the specific product requirements) by scissors;

[0063] Step 4, the segmented low carbon steel is fed into the female die by a feeding rod;

[0064] Step 5, the first punch is aligned with the female die to perform a punching process to obtain a screw blank with a mushroom-shaped upper portion and a polished rod at the lower portion; (the maximum diameter of the mushroom shape is 4.3-4.4 mm, the height of the mushroom shape is 1.7-1.8 mm, and the length of the polished rod is 4.6-4.7 mm)

[0065] Step 6, the second punch is aligned with the female die to perform a second punching process to obtain an eccentric screw semi-finished product with an eccentric screw head at the upper part and an eccentric polished rod at the lower part;

[0066] Step 7: The ejector pin in the female mold ejects the semi-finished eccentric screw into the receiving box below;

[0067] Step 8, conduct the first inspection on the semi-finished eccentric screws, and transfer the qualified materials to the next process;

[0068] Step 9, install the eccentric screw semi-finished product into the vibration plate;

[0069] Step 10, the semi-finished eccentric screw is sent from the discharge port of the vibration plate through the transmission track and into the thread rolling template by the automatic pushing device;

[0070] Step 11, after the thread rolling process of the two dynamic and static thread rolling templates, the eccentric screw product is obtained; (Note: the thread can be a triangular thread or a common thread, the screw can be a machine screw or a self-threading screw, and the specific parameters are set according to the product requirements)

[0071] Step 12, the finished eccentric screws automatically fall into the finished product receiving box;

[0072] Step 13, conduct a second inspection on the finished eccentric screws, and transfer qualified materials to the next process;

[0073] Step 14, the eccentric screw finished product is cleaned;

[0074] Step 15, after electroplating, the final eccentric screw product is obtained;

[0075] Step 16, performing final product inspection on the eccentric screw product;

[0076] Step 17: Qualified products are put into storage.

[0077] In step 6, the eccentric screw head is in the shape of two concentric cylinders stacked up and down, the diameter of the upper cylinder is smaller than that of the lower cylinder, the top of the eccentric screw head is deviated from the center of the circle and is provided with a hexagonal screwdriver hole concave downward, and a concave hole is provided at the intersection of the extension line of the line connecting the center of the screwdriver hole and the center of the circle to the edge of the upper cylinder for position marking, the specific height and diameter of the upper cylinder and the lower cylinder can be set according to product requirements, and the eccentric polished rod is a cylinder or a triangular cylinder. In steps 4, 5, and 6, a cylindrical cavity or a triangular cylinder cavity is provided in the female mold.

[0078] In summary, the technical solution of the present invention has the following beneficial effects:

[0079] This solution solves the problem of adding independent baffles to existing printers, which increases material costs, assembly time, and low work efficiency. Using a punch for an eccentric screw according to this solution, an eccentric screw can be produced. This eccentric screw cleverly utilizes the screw and the eccentric screw head, avoiding the problem of printer light leakage affecting printing clarity, and does not add independent baffles, saving materials and assembly time, while improving work efficiency. The punch designed by this solution has a simple structure and is easy to make, saving the cost of the mold. The semicircular groove designed on the upper part of the second punch can improve the impact resistance of the second punch and extend the service life of the second punch. The punch designed by this solution facilitates the processing and manufacturing of eccentric screws, thereby improving production efficiency.

[0080] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. A punch structure for an eccentric screw, characterized in that: The punch includes a first punch and a second punch, wherein the first punch includes a first body, an arc-shaped hole arranged at the center of the lower part of the first body, and an ejector pin arranged at the center of the first body, the head of the ejector pin abuts against the arc-shaped hole, and the first punch is used to punch out the prototype of an eccentric screw; the second punch includes three parts: an upper part, a middle part, and a lower part, the upper part is provided with a protection mechanism, the middle part is the second body, and the lower part is provided with a concave punch hole at the center, and an eccentric lower convex punch block is provided at the top of the punch hole, and the second punch punches out an eccentric screw with fastening and light shielding functions under the impact of the punch press; The protection mechanism is a concave semicircular groove arranged at the center of the top of the second punch, and the diameter of the semicircular groove is 5.2 mm; The punch hole is divided into two concentrically overlapping upper and lower hollow cylinders, the diameter of the upper cylinder is smaller than that of the lower cylinder; the depth of the punch hole is 1.5±0.05mm; the diameter of the upper cylinder is 4.3-4.4mm, and the diameter of the lower cylinder is 5.9-6.0mm; The punch block is hexagonal, the circumscribed circle diameter of the hexagonal is 2.39 mm, and the height of the hexagonal is 1.15-1.20 mm; The distance between the center of the punch block and the center of the punch hole is 0.40 to 0.45 mm; A protrusion is provided at the intersection of the center of the punch block and the center of the punch hole and the edge of the upper cylinder. The length of the protrusion is 0.6-0.7mm, the width is 0.5mm, and the height is 0.25±0.05mm.

2. The punch structure of an eccentric screw according to claim 1, characterized in that: The head of the punch block is conical, the top angle of the cone is 143°, and the bottom of the cone is connected to the hexagonal flower shape; the height of the second body is 24.96-24.99 mm, and the diameter is 13.96-13.98 mm.

3. The punch structure of an eccentric screw according to claim 2, characterized in that: The corners and intersections of the upper cylinder and the lower cylinder are all provided with inverted arcs.

4. The punch structure of an eccentric screw according to claim 3, characterized in that: The height of the first body is 44.8-45.0 mm, the main body diameter of the first body is 18.97-19.0 mm, and the bottom diameter of the first body is 20.0±0.05 mm; the depth of the arc-shaped hole is 1.75±0.05 mm, and the hole mouth diameter of the arc-shaped hole is 4.3-4.4 mm; the main body diameter of the ejector pin is 2.35-2.37 mm, the bottom diameter of the ejector pin is 3.35±0.05 mm, and the bottom height of the ejector pin is 8.0±0.1 mm.

5. An eccentric forming method for an eccentric screw, using the punch structure of an eccentric screw according to any one of claims 1 to 4, and a female die matched therewith, characterized in that: Follow these steps: Step 1, loading a low-carbon steel coil with a circular cross section into a cold heading machine; Step 2, the low carbon steel is pressed into a straight line after passing through a straightening wheel; Step 3, cutting into segments of low carbon steel using scissors; Step 4, the segmented low carbon steel is fed into the female die by a feeding rod; Step 5, the first punch is aligned with the female die to perform a punching process to obtain a screw blank with a mushroom-shaped upper portion and a polished rod at the lower portion; Step 6, the second punch is aligned with the female die to perform a second punching process to obtain an eccentric screw semi-finished product with an eccentric screw head at the upper part and an eccentric polished rod at the lower part; Step 7: The ejector pin in the female mold ejects the semi-finished eccentric screw into the receiving box below; Step 8, conduct the first inspection on the semi-finished eccentric screws, and transfer the qualified materials to the next process; Step 9, install the eccentric screw semi-finished product into the vibration plate; Step 10, the semi-finished eccentric screw is sent from the discharge port of the vibration plate through the transmission track and into the thread rolling template by the automatic pushing device; Step 11, after the thread rolling process of the dynamic and static thread rolling templates, the eccentric screw finished product is obtained; Step 12, the finished eccentric screws automatically fall into the finished product receiving box; Step 13, conduct a second inspection on the finished eccentric screws, and transfer qualified materials to the next process; Step 14, the eccentric screw finished product is cleaned; Step 15, after electroplating, the final eccentric screw product is obtained; Step 16, performing final product inspection on the eccentric screw product; Step 17, qualified products are put into storage; The eccentric screw head described in step 6 is in the shape of two concentric cylinders stacked up and down, the diameter of the upper cylinder is smaller than the diameter of the lower cylinder, a downwardly concave hexagonal screw hole is provided at the top of the eccentric screw head deviating from the center of the circle, and a concave hole is provided at the intersection of the extension line of the line connecting the center of the screwdriver hole and the center of the circle to the edge of the upper cylinder for position marking, and the eccentric polished rod is a cylinder or a triangular prism; a cylindrical cavity or a triangular prism cavity is provided in the female mold described in steps 4, 5, and 6.

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