CN2208995Y

CN2208995Y - Screw extrusion self-tapping bolt combs

Info

Publication number: CN2208995Y
Application number: CN 93224010
Authority: CN
Inventors: 王庆堂; 王民钢; 唐力军
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-08
Filing date: 1993-09-08
Publication date: 1995-10-04
Anticipated expiration: 2003-09-08

Abstract

The utility model relates to a screw extrusion self-tapping screw thread rolling plate, which is a high efficiency tool used for rolling screws with threads. The moulding faces of a movable plate and a dead plate of the utility model are plain faces or are composed of a plain face part and a slant face part. The utility model is characterized in that the threads of the plain face part are provided with 10-120 excavated spiral chutes with a large guiding distance, the bottom faces of the threads are provided with periodic wave-shaped faces, and the thread forms of the slant face are from the starting end of 30-120 DEG graded into the 60 DEG metric thread standard thread form or the 55 DEG inch screw thread standard thread form on the excavated metric threads of the plain face part. The utility model has the advantages standard internal threads can be extruded without chips in an unthreaded hole on the rolled screws, the rolled screws can replace the ordinary screws, the fastening force is strong, and the self locking character is good.

Description

Screw extrusion self-tapping bolt combs

The utility model is a screw extrusion tapping screw screw plate, is to be used for twisting the higher a kind of instrument of screw extrusion tapping screw efficient.

The utility model is made up of moving plate and two of quiet plates, by the screw plate development that twists international standard ISO1478-83 self threading pin, because ISO1478-83 tapping screw thread height is too little, it is limited to bear pulling force, easily thread off, only limit the use of in stressed little thin-walled parts, can not exchange with the metric system screw again.Its guide cone is circular cone or truncated cone, and the form of thread of guide cone is constant, and it is big to be screwed into moment, guides badly, and friction is big, and screw thread fineness is low.

The purpose of this utility model is the screw plate that design is a kind ofly made applied range, fastening force is strong, self-locking performance good, chipless squeezes out the screw extrusion tapping screw of standard female in unthreaded hole.

Technical solution of the present utility model is: screw extrusion tapping screw screw plate, be made up of moving plate (1) and (2) two of quiet plates, the profile of its moving plate (1) and quiet plate (2) is plane (4) or is made up of planar section (4) and chamfered portion (3).Recessed 10～120 the big helical pitch spiral chutes (5) that have expansion on the thread surface of planar section (4), each bar skewed slot is by the sunk little hole of a constant pitch by many, form by big helical pitch spiral oblique line arrangement continuously, the form of thread in these little holes is 60 ° of basic-profiles of metric thread (7) or 55 ° of basic-profiles of inch screw thread (7), remainder is recessed 60 °～120 ° form of threads (6), more than two kinds of different form of threads (7), (6) be in the tooth kerve of same helix, because its depth is different with width, form a periodic wave, thereby the ideal plane at the bottom of monoblock screw plate planar section (4) tooth is one periodic wave profile is arranged.

The degree of depth of the form of thread in the utility model (7) be the footpath the most greatly of screw deduct screw the nominal path divided by 2,60 °～120 ° form of threads (6) degree of depth of remainder is the intersection point places that two half-angles intersect.

The oblique angle (10) of the chamfered portion in the utility model (3) is 0 °～30 °.Form of thread on the chamfered portion (3) is carried out the transition to 60 ° of basic-profiles of recessed metric thread (9) or 55 ° of basic-profiles of inch screw thread (9) of planar section gradually by 30 °～120 ° tooth forms (8) at top.

The utility model advantage compared with prior art:

1, have 10～120 big helical pitch spiral chutes (5) on the screw plate thread surface, its effect has 2 points:

(1) can utilize the moment of torsion of how much adjusting screw of spiral chute.

(2) when twisting, can keep screw to rotate continuously and stably, improve the precision and the quality of screw.

2, the top tooth form (8) of screw plate chamfered portion is 30 °～120 °, can attack crowded material according to different quilts, optimizes angle with rational, and it is crowded not turned again smoothly that screw is attacked.

3, the screw thread of screw plate is a metric thread, and the screw that rubs can exchange with the metric system screw.

Below in conjunction with accompanying drawing, the utility model embodiment has been described:

Fig. 1 twists schematic diagram for screw extrusion tapping screw screw plate.Fig. 2 is a screw extrusion tapping screw screw plate front view.Fig. 3 is the screw plate vertical view.Fig. 4,5,6, be screw plate right side sectional view example.Fig. 7 is big helical pitch spiral chute part form of thread schematic diagram.Fig. 8 is non-big helical pitch spiral chute part form of thread schematic diagram.

The utility model mainly is to change the tapping screw thread on the screw plate into metric thread by the screw plate development that twists international standard ISO1478-83 self threading pin.As shown in Figure 1, form by moving plate (1) and (2) two of quiet plates, the profile of its moving plate (1) and quiet plate (2) is formed by planar section Fig. 2 (4) and chamfered portion Fig. 2 (3), recessed 25 the big helical pitch spiral chute Fig. 3 (5) that have expansion on the thread surface of planar section Fig. 2 (4), each bar skewed slot is by the sunk little hole of a constant pitch by many, form by big helical pitch spiral oblique line arrangement continuously, the form of thread in these little holes is 60 ° of basic-profile Fig. 7 of metric thread (7), remainder is 100 ° recessed form of thread Fig. 8 (6), more than two kinds of different form of thread Fig. 7 (7) Fig. 8 (6) be in the tooth kerve of same helix, because its depth is different with width, form a periodic wave, thereby the ideal plane at the bottom of the monoblock screw plate planar section tooth is one periodic wave profile is arranged.

The degree of depth of form of thread Fig. 7 (7) in the utility model be the footpath the most greatly of screw deduct screw the nominal path divided by 2,100 ° of form of thread Fig. 8 (6) degree of depth of remainder is the intersection point places that two half-angles intersect.

The oblique angle (10) of chamfered portion Fig. 2 (3) in the utility model is 22 ° 30 ', and the form of thread on chamfered portion Fig. 2 (3) is carried out the transition to 60 ° of basic-profile Fig. 4 of recessed metric thread (9) of planar section gradually by 60 ° of tooth form Fig. 4 (8) at top.

Example: M3-6h screw extrusion tapping screw screw plate

Known: screw is footpath d=3.045 the most greatly

Footpath d in the screw nominal ₂=2.735

Screw nominal path d ₁=2.459

Pitch p=0.5

Rib is counted n=5

The wide f=0.5 of rib

Cone angle 2 θ=45 °

Screw plate spiral chute angle ω=6 ° then

Because of the screw rib is counted n=5, so 25 recessed big helical pitch spiral chutes (calculating with screw rotation 5 circles) are arranged on the screw plate.

Little hole form of thread is 60 ° of basic-profiles of metric thread.Remainder is 100 ° of form of threads.

The little hole form of thread degree of depth is (d-d ₁) ÷ 2=(3.045-2.459) ÷ 2=0.293.100 ° of form of threads (6) degree of depth of remainder is the intersection point place that two half-angles intersect.

Bevel angle θ=22 ° 30 '

Form of thread on the chamfered portion is carried out the transition to 60 ° of basic-profiles of recessed metric thread of planar section gradually by 60 ° of tooth forms at top.

All the other key elements of screw plate are all by GB972-83.

The utility model can twist a kind of screw extrusion tapping screw, this screw is made up of head of screw, screw rod and guide cone, have many big helical pitch scrolls on the screw rod, guide cone is circular cone or truncated cone, cone angle is 0 °～60 °, form of thread on the guide cone is by 30 °～120 ° 60 ° of basic-profiles of metric thread or 55 ° of basic-profiles of inch screw thread that crossfade into big end of small end first button, this screw can squeeze out standard female by chipless in unthreaded hole, can exchange with plain screw, the screw of extruding, fineness is good, intensity is big, precision is high; Can be used for thin-walled parts and be hit, the machine components of variable load, its applied range, fastening force is strong, self-locking performance is good.

Claims

1, screw extrusion tapping screw screw plate, form by moving plate (1) and (2) two of quiet plates, the profile of its moving plate (1) and quiet plate (2) is plane (4) or is made up of planar section (4) and chamfered portion (3), it is characterized in that: recessed 10～120 the big helical pitch spiral chutes (5) that on the thread surface of planar section (4), have expansion, each bar skewed slot is by the sunk little hole of a constant pitch by many, form by big helical pitch spiral oblique line arrangement continuously, the form of thread in these little holes is 60 ° of basic-profiles of metric thread (7) or 55 ° of basic-profiles of inch screw thread (7), remainder is recessed 60 °～120 ° form of threads (6), more than two kinds of different form of threads (7), (6) be in the tooth kerve of same helix, because its depth is different with width, form a periodic wave, thereby the ideal plane at the bottom of monoblock screw plate planar section (4) tooth is one periodic wave profile is arranged.

2, screw extrusion tapping screw screw plate according to claim 1, it is characterized in that: the degree of depth of form of thread (7) be the footpath the most greatly of screw deduct screw the nominal path divided by 2,60 °～120 ° form of threads (6) degree of depth of remainder is the intersection point places that two half-angles intersect.

3, according to claim 1 or 2 described screw extrusion tapping screw screw plates, it is characterized in that: the oblique angle (10) of screw plate chamfered portion (3) is 0 °～30 °, and the form of thread on the screw plate chamfered portion (3) is carried out the transition to 60 ° of basic-profiles of recessed metric thread (9) or 55 ° of basic-profiles of inch screw thread (9) of planar section gradually by 30 °～120 ° tooth forms (8) at top.