CN101700662A

CN101700662A - Drill needle for halogen-free printed circuit board (PCB)

Info

Publication number: CN101700662A
Application number: CN200910112771A
Authority: CN
Inventors: 星宫实
Original assignee: TUNGALOY XIAMEN CO Ltd
Current assignee: TUNGALOY XIAMEN CO Ltd
Priority date: 2009-11-12
Filing date: 2009-11-12
Publication date: 2010-05-05

Abstract

The invention discloses a drill needle for halogen-free printed circuit board (PCB), comprising a needle bar and a needle head, wherein the needle head is spiral, and the included angle between a spiral line of the needle head and an axial line of the needle bar is a spiral angle which is 42-48 degrees; the cross section of the needle head is a core thick ditch cross section which has the design similar to an I shape. Aiming at the characteristic of high strength of a halogen-free base plate which is different from the common PCB in a state of high temperature, the invention adopts the design way of the drill needle different from the traditional way, and carries out creative design on the spiral angle and the core thick ditch cross section of the drill needle, so as to change the spiral angle, improve the cutting property and realize the improvement of pore wall accuracy; furthermore, the high rigidity principle of H-type steel is applied to the design of the core thick ditch cross section of the drill needle, so that the best drill needle strength can be realized by the minimum core thickness and maximum ditch area, and the hole site accuracy which is the same as that processed on the common base plate can be realized.

Description

A kind of halogen-free printed circuit plate drill point

Technical field

The present invention relates to a kind of drill point, particularly be applicable to the drill point of the tellite of halogen-free material.

Background technology

Use harmful substance in the electronic and electrical equipment for being limited in, in February, 2003, the ROHS instruction was issued in European Union.In order to reach the requirement of ROHS instruction, domestic relevant export-oriented enterprise has taked positive counter-measure one after another.

Halogen Halogen is meant the element of the 17th family in the periodic table of elements, comprises F, CL, Br, I, At.And the awkward material of cutting of the tellite that contains Halogen easily produces pernicious gases such as dioxin during its burning, belongs to the object that the ROHS instruction is limited.In order to satisfy the requirement of ROHS instruction, the tellite of halogen-free material (Halogen-free) has appearred in industry.

Halogen-free sheet material is compared with general sheet material, and its main feature is, can not produce above-mentioned pernicious gas during high temperature, the deformation phenomenon of general sheet material also can not occur, has high rigidity; Secondly, heating under the condition of high temperature, than general sheet material hardness height, was called as difficulty and cuts plate when substrate was cut off distortion.

Position, the hole precision and the inwall precision of halogen-free sheet material are all had relatively high expectations, and difficulty of processing is bigger, utilize cutting drill point in the past, are difficult to reach processing request.And advantage of the present invention just is by increasing the spiral angle of existing cutting drill point, adds the particular design of the thick ditch section of core, realizes and the general the same cutting effect of sheet material in the past.But the helical angle that increases drill point means and can occur increasing the substrate difficulty of processing, and the problem that weakens relatively of drill point intensity.

According to original method for designing, the thick ditch section 30 of core is approximate in-line design, as shown in Figure 3, in order to improve drill point intensity, just can only be to improve the thick degree of core, and improve the thick degree of core, can offset the effect of improving that helical angle becomes big generation, reason is, this kind method can reduce the chip removal area of ditch, cause chip removal to be stopped up, and smear metal and sheet material inwall rubs, inwall precision to cutting sheet material also can cause harmful effect, makes the design effect of helical angle weaken.

In view of the above problems, the inventor is through studying repeatedly for a long time, test and improving, make every effort in the design of spiral angle and the thick ditch section of core, seek best Combination Design, finally break through traditional mode, found the another kind of method that has more practicality and feasibility, successfully develop the present invention, solved an industry difficult problem.

Summary of the invention

The object of the present invention is to provide a kind of halogen-free printed circuit plate drill point, so that position, the hole precision that halogen-free sheet material reaches with generally sheet material is the same and the processing effect of inwall precision.

To achieve these goals, solution of the present invention is:

A kind of halogen-free printed circuit plate drill point comprises shank and syringe needle, and syringe needle is helical form, and the angle of its helix and shank axis is a helical angle, and helical angle is 42～48 °; The syringe needle section is the thick ditch section of core, and the thick ditch section of core is the I-shaped design of class.

Described helical angle is 45 °.

Adopt said structure, the present invention is directed to halogen-free substrate and under the condition of high temperature, be different from the high-strength characteristic of general printed circuit board (PCB), use is different from traditional drill point design, helical angle and the thick ditch section of core to drill point carry out innovative design, change spiral angle, to improve cutting ability, realize that the hole wall precision improves; With the high rigidity principle of H shaped steel, be applied to the thick ditch Section Design of core of drill point, realized with the core of minimum thick, the maximum best drill point intensity of ditch area realization, thereby realized and the same position, the hole precision of general substrate processing.

Description of drawings

Fig. 1 is the schematic diagram of drill point spiral angle of the present invention;

Fig. 2 is the key diagram of drill point spiral angle process principle of the present invention;

Fig. 3 is the design diagram of the thick ditch section of original core;

Fig. 4 is the schematic diagram of the thick ditch Section Design of drill point core of the present invention;

Fig. 5 is the structural representation of H shaped steel.

The specific embodiment

Below in conjunction with accompanying drawing embodiments of the invention are done detailed explanation.

As shown in Figure 1, a kind of halogen-free printed circuit plate drill point comprises shank 2 and syringe needle 1, and syringe needle 1 is a helical form, and its helix 11 is a helical angle with the angle of shank 2 axis, and helical angle is 42～48 °, and present embodiment is preferably 45 °; The section of syringe needle 1 is the thick ditch section 3 of core, and the thick ditch section 3 of core is the I-shaped design of class.

Aspect the inwall precision, because halogen-free sheet material has the hardness higher than general sheet material, use general design angle can't satisfy processing request, general design angle mostly is 30 degree～40 degree.If adopt the spiral angle of 30 degree～40 degree, the cutting angle of cutting blade and substrate is bigger, and cutting effect is not good, and the present invention uses industry from original 45 degree helical angles, consults shown in Figure 1.After the principle of 45 degree helical angles is to add large helix angle, the angle that cutting blade and substrate form will diminish, and under equal row culture, have stronger cutting ability, thereby will solve the inwall precision problem of halogen-free sheet material, consult shown in Figure 2.Certainly, the raising of spiral angle will certainly increase the difficulty of processing of drill point, and main by improving the board precision in the actual process, the board adjustment technology that promotes the operating personnel is dealt with.

Aspect the precision of position, hole,, strengthen spiral angle and make the intensity of drill point reduce, thereby influence position, hole precision because halogen-free sheet material has the hardness higher than general sheet material.In order not reduce the intensity of drill point, guarantee position, hole precision, the present invention utilizes the structural principle (consulting Fig. 5) of H shaped steel, adopt the H shaped steel thick ditch Section Design of core (consulting Fig. 4), do not increasing under the thick prerequisite of core, promptly do not reduce under the prerequisite of ditch area, improve the rigidity of drill point, guaranteed the inwall precision of substrate.

H-shaped steel is the better economical section steel of a kind of section mechanical property that formed by the i shaped steel optimized development, it is because of section and identical the gaining the name of English alphabet " H ", characteristics are that the edge of a wing is wide, lateral rigidity is big, bending resistance is strong, and the same cross-sectional load is down. and hot rolling H steel construction alleviates 15%-20% than conventional steel construction weight.

Therefore, the drill point of said structure can make halogen-free sheet material reach the hole position precision the same with general sheet material and the processing effect of inwall precision.

In conjunction with the accompanying drawings the present invention has been done detailed description above, but the present invention is not limited to the foregoing description, in the ken that those of ordinary skills possessed,, all should falls within the scope of protection of the present invention its many variations of making.

Claims

1. a halogen-free printed circuit plate drill point comprises shank and syringe needle, and syringe needle is a helical form, the angle of its helix and shank axis is a helical angle, the syringe needle section is the thick ditch section of core, it is characterized in that: described helical angle is 42～48 °, and the thick ditch section of core is the I-shaped design of class.

2. a kind of halogen-free printed circuit plate drill point as claimed in claim 1, it is characterized in that: described helical angle is 45 °.