CN207065059U - A kind of moulding with special-shaped pre-threaded hole - Google Patents

Abstract

The utility model discloses a kind of moulding with special-shaped pre-threaded hole, including moulding housing, the housing outer rim opening is provided with different in nature pre-threaded hole, the odd-shaped cross section is the polygon or ellipse that interior angle is circular arc, by using said structure, surplus is used as by the space of polygon corner, can not only prevent screw from sliding tooth, and can prevent from being split up problem caused by screw is excessive, the service life of product is effectively ensured.

Description

A kind of moulding with special-shaped pre-threaded hole

Technical field

The utility model designs injection structure part technical field, more particularly to a kind of injection with special-shaped pre-threaded hole Part.

Background technology

Moulding refers to be referred to as moulding, including various packagings, part etc. by the various injecting products of injection machine production.It is main If by the material such as polyethylene or polypropylene and made of with the addition of after a variety of organic solvents.Usual injecting products will in injection Screw hole integrated injection molding, bolt hole are mainly used in follow-up injecting products and coordinate tapping screw to play connection function when in use, still, Tapping screw pre-manufactured hole is circular cross-section on existing moulding, and allowance control at that time, does not easily cause tapping screw and screws in generation cunning Tooth and problem is split up, because the crackle, cracking or stripped thread of tapping screw pre-manufactured hole can cause product premature failure, to the matter of product Amount, which is brought, to be had a strong impact on.

Utility model content

The utility model does not easily cause sliding tooth, is split up problem in view of the shortcomings of the prior art, provide a kind of Stability Analysis of Structures Moulding with special-shaped pre-threaded hole.

In order to solve the above technical problems, the utility model is addressed by the following technical programs, one kind has abnormity pre- The moulding of screwed hole processed, including moulding housing, the housing outer rim opening are provided with different in nature pre-threaded hole, the abnormity Section is the polygon or ellipse that interior angle is circular arc.

In such scheme, it is preferred that the polygon is equilateral triangle, quadrangle or pentagon.

In such scheme, it is preferred that the inscribed circle diameter D of the equilateral triangle tee section is the 0.5 of screw nominal diameter ~0.75 times, the pre-threaded hole stability of triangular-section is higher.

In such scheme, it is preferred that the special-shaped pre-threaded hole depth H is more than or equal to the 1.1 of screw nominal diameter ~1.3 times, screwed hole it is deep-controlled, can effectively reduce end material stock stress release, appearance is broken in reduction.

In such scheme, it is preferred that the special-shaped pre-threaded hole is one of the forming with the housing, can guarantee that outward appearance U.S. See, also meet strength demand simultaneously.

The beneficial effects of the utility model are compared with prior art：By using said structure, pass through polygon corner Space as surplus, can not only prevent screw from sliding tooth, and being split up caused by screw screws in when screw shrinks can be prevented Problem, the service life of product is effectively ensured.

Brief description of the drawings

Fig. 1, the utility model structure diagram.

Fig. 2, the utility model front view.

A-A sectional views in Fig. 3, Fig. 2.

Fig. 4, special-shaped pre-threaded hole schematic cross-section.

Embodiment

With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.

Referring to Fig. 1 to Fig. 4, a kind of moulding with special-shaped pre-threaded hole, including moulding housing 1, the housing 1 Outer rim opening is provided with different in nature pre-threaded hole 11, and the different in nature section of pre-threaded hole 11 is the polygon that interior angle has circular arc Or ellipse.

The polygon is equilateral triangle, quadrangle or pentagon, most preferably uses section as equilateral triangle, The inscribed circle diameter D of the equilateral triangle tee section is 0.5~0.75 times of screw nominal diameter, the most most preferably, using etc. The inscribed circle diameter D of side triangular-section is 0.6 times of screw nominal diameter, and the special-shaped depth H of pre-threaded hole 11 is more than Or 1.1 ~ 1.3 times equal to screw nominal diameter, the different in nature pre-threaded hole 11 is one of the forming with the housing.

Self-tapping screw its so-called " self tapping " is exactly that need not make negative thread in advance by latch fitting to coordinate the screw thread on screw, Because self-tapping screw oneself can be locked by latch fitting while making screw thread on by latch fitting, its torsion is bigger than normal to cause screw Hole bursts, and influences that the factor of screw torsion is very more, and the diameter of screw, diameter is bigger, and torsion needs are bigger；The length of screw, Screw is bigger, and torsion needs bigger；The oblique angle of screw hole, oblique angle is bigger, and torsion needs bigger；The draft angle of screw hole, take off Modular angle degree is bigger, and torsion needs bigger.

Be in real life, the problem of screw stripped thread it is embedded it is undersized caused by, and screw screws in then when screw shrinks Screw hole can be caused to be split up, therefore, traditional screwed hole usually requires to select rational tapping screw, according to optimal tightening torque Determination method, study give various physical dimensions, the torque standard of tapping screw, otherwise there is situation about failing, so The screw that causing screwed hole can match relatively limits to, and by using said structure, using the pre-threaded hole of polygon, makes its presence Larger surplus, corner angle disclosure satisfy that the less screw of size, also disclosure satisfy that larger-size screw, improve of screwed hole With ability.

Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art For art personnel, on the premise of the utility model technical principle is not departed from, some improvement and modification can also be made, these change Enter and also should be regarded as the scope of protection of the utility model with modification.

Claims (5)

1. a kind of moulding with special-shaped pre-threaded hole, including moulding housing（1）, it is characterised in that the housing（1） Outer rim opening is provided with special-shaped pre-threaded hole（11）, the special-shaped pre-threaded hole（11）Section is that interior angle has the more of circular arc Side shape or ellipse.

A kind of 2. moulding with special-shaped pre-threaded hole according to claim 1, it is characterised in that the polygon For equilateral triangle, quadrangle or pentagon.

3. a kind of moulding with special-shaped pre-threaded hole according to claim 2, it is characterised in that described equilateral three The inscribed circle diameter D of angle section is 0.5~0.75 times of screw nominal diameter.

4. a kind of moulding with special-shaped pre-threaded hole according to claim 1, it is characterised in that the abnormity is pre- Screwed hole processed（11）Depth H is more than or equal to 1.1 ~ 1.3 times of screw nominal diameter.

5. a kind of moulding with special-shaped pre-threaded hole according to claim 1, it is characterised in that the abnormity is pre- Screwed hole processed（11）It is one of the forming with the housing.