TWI893585B - Screw head die - Google Patents

Abstract

A screw head die is provided, which is composed of a screw head die base, an inner die base and an outer die cylinder. A concave tapered hollow forming cavity is provided in the center of the screw head die base, which is larger at the top and smaller at the bottom and passes through the screw head die base. The inner ring wall of the tapered hollow forming cavity is provided with at least one spiral concave spiral cutter forming groove. The lower spiral starting point and the upper spiral ending point of the concave spiral cutter forming groove are both zero, so that the spiral cutter forming groove gradually widens and deepens from the lower spiral starting point at zero, and then gradually narrows and shallows to the upper spiral ending point at zero. At the end of the rotation, the screw head die seat is located at the top center of the mold's inner base. A through-hole is located in the center of the upper portion of the mold's outer barrel, allowing the screw head die seat to be exposed. This through-hole communicates downward with the hollow inner cavity of the outer barrel. The inner base is placed within the hollow inner cavity of the outer barrel, and a hollow channel is provided in the center of the inner base. This ensures that the hollow channel of the inner base and the tapered hollow molding cavity of the screw head die seat are coaxial. This creates a screw head die that is easy to assemble, low in cost, allows for quick component replacement, is highly industrially applicable, and offers excellent economic benefits.

Description

Screw head die

A modular screw head die that features simple assembly, low cost, quick component replacement, long service life, high industrial applicability, and excellent economic benefits.

The use of cold forging to form screws individually during the screw production process is a well-known technique in the related technology industry. However, the screw forming dies essential for this forging process also have varying technical results depending on the technical philosophies and molding efficiency requirements of each industry.

However, conventional screw head die casting molds are constructed as a single, integral structure. Because the die must withstand the impact of forging, it is manufactured from a single material, resulting in high mold manufacturing costs. Furthermore, the die design resulting from this single mold processing also limits the mold design to a single die. Consequently, the more screw head shapes designed, the more die casting molds are required. Furthermore, if the die is damaged, the entire die casting mold becomes unusable or even scrapped. This presents existing shortcomings in terms of practicality, industrial applicability, and economic efficiency that need to be improved.

Therefore, the inventors of this case believe that the early technical innovations, which limited the high cost of single-unit manufacturing and the single mold with only a single mold model, are indeed in need of further improvement to effectively enhance the practical progress and industrial applicability of the technical innovations.

The purpose of creating this "screw head die" project is to:

(1) Provide practical convenience such as easy assembly, cost-effective reduction, component damage, or component interchangeability.

(2) Provide long service life and allow replacement of damaged components while continuing to use undamaged components, thus achieving high industrial utilization efficiency and excellent economic benefits.

The creative features of this project are:

The die-casting mold is composed of a screw head mold base, an inner mold base, and an outer mold cylinder; among them,

The screw head mold base is located at the top center of the mold base. A concave, tapered hollow molding cavity is provided in the center of the screw head mold base, extending through the screw head mold base and extending from larger at the top to smaller at the bottom. The inner ring wall of the tapered hollow molding cavity is provided with at least one spirally concave spiral cutter molding groove.

The spiral cutter's groove forming point has both the lower spiral starting point and the upper spiral ending point set to zero;

The spiral cutter forms a groove that gradually widens and deepens from the starting point of the lower spiral, which returns to zero, and then gradually narrows and shallows to the end point of the upper spiral, which returns to zero;

The inner wall of the spiral cutter-formed groove is an inclined surface that slopes outward from top to bottom, while the outer wall of the spiral cutter-formed groove is an inclined surface that slopes inward from top to bottom.

The inner wall of the spiral cutter forming groove is a slanted wall surface that slopes outward from top to bottom at a predetermined angle. The outer wall of the spiral cutter forming groove is a slanted wall surface that slopes inward from top to bottom at a predetermined angle. An arc angle is formed between the upper end of the inner wall of the spiral cutter forming groove and the inner annular wall of the tapered hollow forming cavity.

The upper outer diameter of the screw head die base is smaller than the lower outer diameter of the screw head die base;

The screw head die seat can be divided into two tightly fitting parts or more than two equal parts;

A through-hole is provided in the center of the upper portion of the mold's outer mold barrel for exposing the screw head and the mold base. The through-hole downwardly communicates with the hollow inner cavity of the mold's outer mold barrel. The upper inner diameter of the through-hole is smaller than the lower inner diameter of the through-hole.

The upper outer diameter of the screw head die seat is the same as the upper inner diameter of the through-hole of the mold outer barrel, and the lower outer diameter of the screw head die seat is the same as the lower inner diameter of the through-hole of the mold outer barrel;

The inner mold base is placed in the hollow inner cavity of the outer mold barrel. A hollow channel is provided in the center of the inner mold base, so that the hollow channel of the inner mold base and the tapered hollow molding cavity of the screw head mold base are coaxial.

The combination of the screw head die holder, inner mold base, and outer mold barrel creates a modular screw head die that offers simple assembly, low cost, fast component replacement, high industrial availability, and excellent economic benefits.

1: Screw head die holder

11: Conical hollow molding cavity

12: Inner Ring Wall

13: Spiral cutter forming grooves

131: Inner groove wall

132:Outer ditch wall

2: Mold base

20: Hollow Channel

3: Mold outer mold cylinder

30: Hollow cavity

31: Penetration

P1: Starting point of the lower spiral

P2: Upper spiral end point

Q1: Predetermined Angle

Q2: Predetermined Angle

Q3: Arc Angle

Figure 1: Schematic diagram of the combination of the creative embodiment of this case.

Figure 2: Top view of Figure 1 after assembly.

Figure 3: A-A cross-section of Figure 2.

Figure 4: Enlarged cross-section of the screw head die seat in Figure 3.

Figure 5: Enlarged view of section C in Figure 4.

Figure 6: Enlarged view of section D in Figure 4.

Figure 7: Enlarged view of section E in Figure 4.

Figure 8: B-B cross-section of Figure 2.

Figure 9: A top view of another embodiment of this project.

Figure 10: A top view of another assembled embodiment of this project.

Figure 11: A top view of another assembled embodiment of this design.

Please refer to Figures 1 and 2, and Figures 9 and 10 for different technical application examples of this invention within the same technical scope, purpose, function, and technical value. All utilize the same screw head die holder, inner mold base, and outer mold barrel to create a modular screw head die that offers simple assembly, low cost, fast component replacement, high industrial applicability, and excellent economic benefits.

Please refer to Figures 1 to 4. The die-casting mold is composed of a screw head mold base 1, a mold inner base 2 and a mold outer mold cylinder 3. Among them, the screw head mold base 1 is located at the top center of the mold inner base 2. The center of the screw head mold base 1 is provided with a concave tapered hollow forming cavity 11 that is larger at the top and smaller at the bottom and passes through the screw head mold base 1. The inner ring wall 12 of the tapered hollow forming cavity 11 is provided with at least one spiral concave spiral cutter forming groove 13. The lower end spiral starting point P1 and the upper end spiral end point P2 of the spiral cutter forming groove 13 are both zeroed to one point. The spiral cutter forming groove 13 is formed by the lower end spiral returning to zero. The spiral starts at point P1 and gradually widens and deepens, then narrows and shallows to its zero-spinning end point P2. The inner groove wall 131 of the spiral cutter forming groove 13 is a sloping wall surface that slopes outward from top to bottom at a predetermined angle Q1. The outer groove wall 132 of the spiral cutter forming groove 13 is a sloping wall surface that slopes inward from top to bottom at a predetermined angle Q2. An arc angle Q3 is formed between the upper end of the inner groove wall 131 of the spiral cutter forming groove 13 and the inner annular wall 12 of the tapered hollow forming cavity 11. The upper outer diameter of the screw head die base 1 is smaller than the lower outer diameter of the screw head die base 1, resulting in a sloping wall surface that slopes inward from bottom to top.

As shown in Figures 1 and 3, the inner mold base 2 is placed within the hollow inner cavity 30 of the outer mold barrel 3. A hollow channel 20 is provided in the center of the inner mold base 2, so that the hollow channel 20 of the inner mold base 2 and the tapered hollow molding cavity 11 of the screw head mold base 1 are coaxial.

Referring again to the figure, the upper center of the mold's outer barrel 3 features a through-hole 31 for the screw head die holder 1 to be exposed. This through-hole 31 communicates downward with the hollow interior 30 of the mold's outer barrel 3. The upper inner diameter of this through-hole 31 is smaller than its lower inner diameter, ensuring that the upper outer diameter of the screw head die holder 1 and the upper inner diameter of the through-hole 31 of the mold's outer barrel 3 are identical, and the lower outer diameter of the screw head die holder 1 and the lower inner diameter of the through-hole 31 of the mold's outer barrel 3 are identical, ensuring a tight and secure fit.

Please refer to Figures 9 to 11 for different application embodiments of the screw head mold base 1. The screw head mold base 1 can be divided into two or more closely spaced equal parts. For example, as shown in Figure 9, the screw head mold base 1 can be divided into two closely spaced equal parts. As shown in Figure 10, the screw head mold base 1 can be divided into four closely spaced equal parts. As shown in Figure 11, the screw head mold base 1 can be divided into six closely spaced equal parts. This allows for different practical application benefits and requirements in manufacturing.

By combining the components shown in the diagram, this design creates a modular screw head die that offers simple assembly, low cost, quick component replacement, long service life, high industrial applicability, and excellent economic benefits.

1: Screw head die holder

11: Conical hollow molding cavity

13: Spiral cutter forming grooves

2: Mold base

20: Hollow Channel

3: Mold outer mold cylinder

30: Hollow cavity

31: Penetration

P1: Starting point of the lower spiral

P2: Upper spiral end point

Claims (2)

A screw head die mold, comprising a screw head die seat, a die inner base, and a die outer barrel, wherein: the screw head die seat is located at the top center of the die inner base, a concave tapered hollow forming cavity is provided in the center of the screw head die seat, and the cavity is larger at the top and smaller at the bottom. The inner ring wall of the conical hollow forming cavity is provided with at least one spirally concave spiral cutter forming groove; the die inner base is placed in the hollow inner cavity of the die outer barrel, and a hollow channel is provided in the center of the die inner base. The mold outer mold barrel has a through-hole at the center of its upper portion, communicating downwardly with the hollow inner cavity of the mold outer mold barrel. The upper inner diameter of the through-hole is smaller than the lower inner diameter of the through-hole. The invention is characterized in that the inner annular wall of the tapered hollow molding cavity is provided with at least one spirally concave spiral cutter forming groove, with the lower spiral starting point and the upper spiral ending point of the spiral cutter forming groove both returning to zero. The spiral cutter forming groove gradually widens and deepens from the lower spiral starting point returning to zero, and then gradually narrows and shallows to the upper spiral ending point returning to zero. According to the die for punching a screw head as described in Item 1 of the patent application, an arc angle is formed between the upper end of the inner groove wall of the spiral cutter forming groove and the inner annular wall of the tapered hollow forming cavity.