TWM446671U - Screw thread squeezer - Google Patents

Description

The present invention relates to a thread processing tool, and more particularly to a thread extruder for internal thread tapping.

Nowadays, electronic devices (such as mobile phones, digital cameras, etc.) on the market are gradually becoming thinner and smaller, and the volume of screws and screw holes for combining the components thereof is also miniaturized, so that it is used in electronic devices. Internal thread tapping operations on the housing require relatively sophisticated and miniaturized tools.

Referring to FIG. 5, the internal thread processing tool used in the prior art is applied to a plastic workpiece having a lower hardness, and is a thread extruder. The extruder is a rod body, and the rod body is respectively a rod. The portion 40 and the one tooth portion 41. A clamping head 400 is disposed at the free end of the rod portion 40. The tooth portion 41 is circumferentially disposed with an external thread. The outer thread can be divided into a plurality of rings arranged at different intervals in the axial position. The threaded segment 42. Referring to FIG. 6 and FIG. 7 , the thread segment 42 has a sharp cutting edge, and a plurality of protruding peaks 420 are formed on the cutting edge, and the teeth on the tooth portion 41 The peaks 420 may be respectively joined along the axial direction of the tooth portion 41 to form a plurality of ridge lines 43 which are straight and are respectively located on the medial side of the extruder. The clamping head 400 of the extruder can be mounted on a chuck of a drilling machine, and the drilling machine can drive the rotation and longitudinal displacement of the extruder, that is, the teeth 41 of the extruder can be longitudinally rotated into the plastic workpiece 50, through The tooth peaks 420 on the thread segments 42 serve as cutting points, and the internal threads are extruded and cut in the plastic workpiece 50. The screw segments 42 can be used as chip removals except for the tooth peaks 420. When it is inserted into the predetermined position in the workpiece 50, it is reversely rotated out of the plastic workpiece 50, and an internally threaded screw hole 51 is obtained on the plastic workpiece 50.

However, in actual operation, referring to FIG. 7, when the extruder taps or reverses the workpiece, since the tooth peaks 420 located on the same ridge line 43 are simultaneously contacted on the inner wall surface of the screw hole 51, Therefore, the stress points are concentrated on the side of the tooth portion 41 having the ridge line 43, so that the torsion force is largely concentrated on the number side, and cannot be evenly distributed on the tooth portion 41, since the extruder generally uses high hardness and low toughness. The tool steel is made, so that the situation in which the torque is concentrated tends to cause the tooth portion 41 to break. Since the tooth portion 41 is located in the screw hole 51 of the workpiece 50 after the fracture, it cannot be easily taken out, so the workpiece 50 cannot be used. The worker must remove the broken extruder from the drill press and install a new extruder onto the drill press, but the re-installation of the extruder must recalibrate its angle and center point, otherwise the new extruder is extremely easy to process. The condition of the fracture requires a long installation and adjustment time, and cannot be quickly and easily replaced, which affects the processing capacity.

In view of the above disadvantages of the above-mentioned extruder being easily broken, another extruder in the prior art is made of a material having lower hardness and better toughness, which can prevent the extruder from breaking when it is retracted from the casing, although High-toughness extruders are more durable, but their low-hardness characteristics result in more time-consuming processing and affecting the processing capacity. Therefore, it is still necessary to develop a high-hardness and non-breakable extruder to meet the needs of the industry.

In view of the fact that the prior art extruder can not be evenly dispersed on the teeth during the tapping, the extruder made of high hardness and low toughness material is easily broken, thereby affecting the processing efficiency and the disadvantage of the production capacity. A threaded extruder that achieves the goal of evenly distributing torque, increasing service life and increasing productivity.

In order to achieve the above-mentioned creative purpose, the technical means used in the thread extruder of the present invention is to provide a rod body, the two ends of which are respectively a rod portion and a tooth portion; a clip is provided at the free end of the rod portion. Holding a head; the external portion is provided with an external thread, and the external thread has a plurality of screw segments spaced apart and connected to each other, and the screw segments are circumferentially disposed on the tooth portion, and the outer edge of the screw segments For the cutting edge, a plurality of protruding peak edges and a plurality of chip edges are arranged on the cutting edge, and adjacent peak edges of the screw segments of each interval are alternately arranged.

In the threaded extruder, adjacent peak edges can be respectively connected to form a plurality of ridge lines, and the ridge lines are spirally arranged and arranged around the teeth.

The threaded extruder wherein the outer diameter of the free end of the tooth portion tapers and forms a conical tip end portion.

The threaded extruder wherein the thickness of the chip edge is greater than the thickness of the peak edge.

In the threaded extruder, the number of peak edges on each cutting edge is five, and the distance between the peak edges is equal.

The threaded extruder, wherein the clamping head has a square cross section.

By the use of the above technical means, since the extruder of the present invention is actually used, the internal thread is tapped in the workpiece through the peak edge of the thread portion of the tooth portion, and most of the torque is located at the time of tapping. On the peak edge, the peak edge disposed on the tooth is interlaced and spirally arranged, and the torsion force during the tapping is provided to be evenly distributed around the tooth portion, so as to avoid the concentration of torque generated by the prior art extruder during tapping. In the case of breakage, the extruder of this creation can withstand greater torque and longer service life, so the extruder can use high hardness materials and high speed processing to effectively improve processing efficiency.

[00014] The present invention is a threaded extruder, as shown in FIG. 1 , which is a rod body, and a rod portion 10 and a tooth portion 20 are respectively formed at two ends of the rod body, and the rod portion 10 has a cylindrical shape. A non-circular clamping head 11 is formed at the free end thereof. In the specific embodiment of the present invention, the clamping head 11 has a square cross section. [00015] Please refer to FIG. 2, the tooth portion 20 has a plurality of threaded segments 21 spaced apart, and the thread segments 21 are elongated ring segments, which are arcs along the long axis of the tooth portion 20. The outer circumference of the threaded portion 21 is connected to each other to form an external thread, and the outer edge of the threaded portion 21 is a cutting edge on the cutting edge. A plurality of peaks 22 are formed in a protruding shape, and the longitudinal extension line of each of the thread segments 21 has an oblique angle with the central axis of the rod portion. Please refer to FIG. 3 for the specific implementation of the present invention. In the example, the number of peak edges 22 on the cutting edge of each thread segment 21 is five, and the distance between the peak edges 22 is equal. The portion of the cutting edge other than the peak edge 22 is formed as a chip edge 23 having a sheet thickness greater than the sheet thickness at the peak edge 22. The adjacent peak edges 22 of the spaced apart screw segments 21 are alternately arranged, and the peak edges 22 are not linearly arranged along the long axis direction of the tooth portion 20, and the adjacent peak edges 22 are respectively connected to form a plurality of ridge lines 24, The ridge lines 24 are spirally formed and circumferentially disposed on the tooth portion 20. The outer diameter at the free end of the tooth portion 20 tapers and forms a conical tip end portion 25. [00016] In the actual use of the extruder of the present invention, the clamping head 11 is mounted on a chuck of a drilling machine, the drilling machine has a power source and can drive the chuck to rotate and perform displacement in the longitudinal direction, thereby driving the extrusion The rotation and longitudinal displacement of the extruder are first corrected to coincide with the center of rotation of the collet. Referring to FIG. 4, the tooth portion 20 is perpendicular to the horizontal plane and above the workpiece 30 to be processed. The power source and the chuck drive the extruder to rotate and move downward, and the tip end portion 25 penetrates against the surface of the workpiece 30, so that the tooth portion 20 gradually rotates and penetrates into the workpiece 30, and passes through the tooth portion 20. The peak edge 22 of the thread segment 21 taps in the workpiece 30 to form an internal thread 31. The debris generated after the workpiece 30 is tapped can be discharged by the chip edge 23, and most of the torque is located on the peak edge 22 due to tapping. The peak edges 22 of the extruder are arranged in a staggered manner and surround the tooth portion 20, so that the torsion force during the tapping can be evenly distributed around the tooth portion 20 to avoid the concentration of the torque generated during the tapping. The extruder can withstand greater torque and longer service life, so the extruder can use high-hardness materials and high-speed machining to improve processing efficiency. [00017] The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been disclosed above in the preferred embodiment, it is not intended to limit the creation, any familiarity. A person skilled in the art can make some modifications or modifications to equivalent embodiments by using the above-disclosed technical contents without departing from the technical scope of the present invention. The technical essence of the present invention, any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the present technical solution.

10‧‧‧ Rod
11‧‧‧Clamping head
20‧‧‧ teeth
21‧‧‧ thread segments
22‧‧‧ tooth peak
23‧‧‧
24‧‧‧ ridgeline
25‧‧‧ tip
30‧‧‧Workpiece
31‧‧‧ internal thread
40‧‧‧ pole
400‧‧‧Clamping head
41‧‧‧ teeth
42‧‧‧ thread segments
420‧‧‧ tooth peak
43‧‧‧ ridgeline
50‧‧‧Plastic workpiece
51‧‧‧ screw holes

Figure 1 is a perspective view of the creation of the present invention. Figure 2 is a perspective enlarged view of a portion of the appearance of the present invention. Figure 3 is a bottom view of the creation. Figure 4 is a schematic cross-sectional view of the creation in use. Fig. 5 is a perspective view of the prior art. Figure 6 is a bottom view of the prior art. Fig. 7 is a schematic cross-sectional view showing the prior art.

10‧‧‧ Rod

11‧‧‧Clamping head

20‧‧‧ teeth

22‧‧‧ Peak

23‧‧‧

25‧‧‧ tip

Claims (8)

A thread squeezer is a rod body, the two ends of the rod body are respectively a rod portion and a tooth portion; a free clamping end is provided at the free end of the rod portion; the plurality of screw segments are arranged on the tooth portion The thread segments are arranged in an arc around the outer wall of the tooth along the long axial direction of the tooth portion, and the two ends of the thread segments are connected to each other to form an external thread, and the thread segments are The outer edge is a cutting edge, and a plurality of protruding peak edges and a plurality of chip edges are arranged on the cutting edge, and adjacent peak edges of the screw segments of each interval are alternately arranged. The thread extruder of claim 1, wherein the adjacent peak edges are respectively extended and connected to form a plurality of ridge lines which are spirally arranged and disposed around the teeth. A threaded extruder as claimed in claim 2, wherein the outer diameter of the free end of the tooth portion tapers and forms a conical tip end portion. The thread extruder of claim 2, wherein the thickness of the chip edge is greater than the thickness of the peak edge. The thread extruder of claim 3, wherein the thickness of the chip edge is greater than the thickness of the peak edge. The thread extruder of any one of claims 1 to 5, wherein the number of peak edges on each of the cutting edges is five, and the distance between the peak edges is equal. A threaded extruder as claimed in claim 6 wherein the longitudinal extension of the body of the thread segments has an oblique angle to the central axis of the shaft. A threaded extruder as claimed in claim 6 wherein the gripping head has a square cross section.