CN105710266A - Electric hammer drill bit cold-headed part molding process - Google Patents

Electric hammer drill bit cold-headed part molding process Download PDF

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Publication number
CN105710266A
CN105710266A CN201610208184.XA CN201610208184A CN105710266A CN 105710266 A CN105710266 A CN 105710266A CN 201610208184 A CN201610208184 A CN 201610208184A CN 105710266 A CN105710266 A CN 105710266A
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CN
China
Prior art keywords
cold
molding
electric hammer
hammer drill
heading
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Application number
CN201610208184.XA
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Chinese (zh)
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CN105710266B (en
Inventor
梁乐天
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乐清市弘德金属有限公司
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Priority to CN201610208184.XA priority Critical patent/CN105710266B/en
Publication of CN105710266A publication Critical patent/CN105710266A/en
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Publication of CN105710266B publication Critical patent/CN105710266B/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08Upsetting

Abstract

The invention discloses an electric hammer drill bit cold-headed part molding process. The electric hammer drill bit cold-headed part molding process comprises 4-5 cold heading molding procedures; and the upper section of a finished wire raw material is thickly upset to form a drill handle rod body of an electric hammer drill bit cold-headed part, and the lower section of the finished wire is finely upset to form a drill body rod body of the electric hammer drill bit cold-headed part. The electric hammer drill bit cold-headed part molding process is characterized by further comprising the following molding steps before the first cold heading molding procedure: (1) the wire diameter of the finished wire raw material after drawing is smaller than the outer diameter of the drill handle rod body by above 0.35 mm; (2) the surface phosphating treatment is performed for the finished wire raw material; and (3) the finished wire raw material performs a pre-cold heading procedure after fixed-length cutting; an edge covering throat is formed at the lower end part of the finished wire; and the port caliber of the edge covering throat is smaller than the outer diameter of the drill body rod body after the first cold heading molding procedure. Through the molding process, the cold heading molding can be directly performed for the finished wire raw material (a metal wire) to form the electric hammer drill bit cold-headed part under the precondition of not performing the annealing treatment, so that the energy conservation and the environmental protection are achieved, the mold stress is low when cold heading molding, and the mold service life is prolonged.

Description

Electric hammer drill cold-heading part moulding process

Technical field

The present invention relates to the moulding process of a kind of electric hammer drill cold-heading part.

Background technology

Electric hammer drill is " impact is bored " and the electric hand tool of " electric hammer " two kinds of functional unifications, " impact is bored " is based on rotary cutting, the beater mechanism having impulsive force concurrently drives drill hammer, while driving drill bit to rotate, also have a direction to be perpendicular to the reciprocating hammer motion of the bit surfaces of revolution, hole on the materials such as concrete, brick, ceramic tile, marble.It is all to carry out the shape drill shanks body of rod by machining and bore the body body of rod before the drill bit of electric hammer drill, cost is reduced for improving efficiency, some producers begin with cold-heading molding technique to carry out the production of electric hammer drill, cold-heading molding technique generally comprises 4-5 road cold-heading molding operation, surface is upset the drillstock body of rod forming electric hammer drill cold-heading part through the epimere of parkerized finished silk raw material (metal wire rod), the hypomere of finished silk is carefully formed the brill body body of rod of electric hammer drill cold-heading part by upsetting, bores the body body of rod and has elongated shape.Owing to finished silk raw material needs to carry out customized cut-off before cold-heading; so cut-off port will exposed metal and do not have phosphate coating to protect; so; during cold-heading; finished silk lower end is easy for occurring that metal contacts with the die cavity of cold upsetting die of car during upsetting is carefully elongated; causing friction to strengthen and deformation difficulty, mould cavity stress is scraped off greatly and easily, and die life is short;Also have, in prior art, the drillstock body of rod is for avoiding upset excessive, the line footpath of finished silk raw material and the external diameter difference of the drillstock body of rod typically to control within 0.25mm, thus result in the undergauge boring the body body of rod and deform than i.e. excessive, also the top layer phosphate coating making finished silk raw material easily causes localized loss exposed metal in deformation process, simultaneously because deflection big mould stress is big, die life is short.Because there is above-mentioned deficiency, so current finished silk raw material drawing process before carrying out cold-heading molding, the annealing heat treatment carried out at least twice is needed to make the metal structure of material improve, first it is unfavorable for energy-conserving and environment-protective, but also there is the deficiency that mould stress is relatively big, die life is shorter in various degree.

Summary of the invention

The present invention has adopted the following technical scheme that:

Electric hammer drill cold-heading part moulding process, including 4-5 road cold-heading molding operation, the epimere of finished silk raw material is upset the drillstock body of rod forming electric hammer drill cold-heading part, the hypomere of finished silk is carefully formed the brill body body of rod of electric hammer drill cold-heading part by upsetting, it is characterised in that also include following forming step before first cold-heading molding operation: 1. finished silk raw material line footpath after drawing is less than the described drillstock body of rod more than external diameter 0.35mm;2. finished silk raw material is through surface granosealing;3. finished silk raw material is carried out pre-cooling upsetting operation after customized cut-off, and the lower end at finished silk forms bound edge reducing, and the port bore of bound edge reducing is less than the brill body body of rod external diameter after first cold-heading molding operation.

By above-mentioned moulding process, the Advantageous Effects that the present invention realizes is: first, finished silk raw material is carried out pre-cooling upsetting operation after customized cut-off, lower end at finished silk forms bound edge reducing, the port bore of bound edge reducing is less than the brill body body of rod external diameter after first cold-heading molding operation, so, the cut-off port of the finished silk raw material of customized cut-off just has phosphate coating protection and avoids exposed metal, in cold-heading molding operation subsequently, finished silk lower end would not occur that during upsetting is carefully elongated metal contacts with the die cavity of cold upsetting die of car, the smooth and easy friction of deformation boring the body body of rod is little, therefore mould cavity stress is little and is difficult to be scraped off, improve die life;Second, because there being the existence of the bound edge reducing that pre-cold-heading operation formed, and the cylindricity of finished silk is the highest after pre-cold-heading, so upset during drillstock body of rod first cold-heading molding can be bigger than normal, so, finished silk raw material line footpath after drawing can be less than the described drillstock body of rod more than external diameter 0.35mm, thus reduces the undergauge i.e. deflection of ratio boring the body body of rod, the little i.e. mould stress of deflection is the least, improves die life.During owing to solving cold-heading molding, mould stress is little, the problem of die life length, so finished silk raw material (metal wire rod) can directly carry out cold-heading molding to form electric hammer drill cold-heading part on the premise of without annealing, reach the purpose of energy-conserving and environment-protective.

As preferably, the difference of the brill body body of rod external diameter after the port bore of described bound edge reducing and first cold-heading molding operation controls at more than 0.15mm.

Accompanying drawing explanation

The present invention has the following drawings:

Fig. 1 is the outline drawing of the finished silk raw material after customized cut-off,

Fig. 2 is the product design figure after pre-cold-heading operation,

Fig. 3 is the product design figure after first cold-heading molding operation,

Fig. 4 is the product design figure after second cold-heading molding operation,

Fig. 5 is the product design figure after the 3rd road cold-heading molding operation,

Fig. 6 is the product design figure after the 4th road cold-heading molding operation.

Detailed description of the invention

As shown in Figure 6, the electric hammer drill cold-heading part of institute of the present invention molding, is made up of, for the electric hammer drill of M8 the arc-shaped transition section 2 boring the body body of rod 3 and the connection upper-lower section body of rod of the drillstock body of rod 1 of epimere, hypomere, the external diameter 11.87mm of the drillstock body of rod 1, bores the external diameter 7.27mm of the body body of rod 3.

The electric hammer drill cold-heading part moulding process of the present invention, including following forming step: 1. finished silk raw material line footpath after drawing is less than the described drillstock body of rod more than external diameter 0.35mm, for the electric hammer drill of M8, the line footpath of finished silk raw material can be 11.5mm;2. finished silk raw material forms phosphate coating through surface granosealing, the outer round surface at finished silk;3. finished silk raw material is by customized cut-off, and now the line footpath of finished silk is equal to the line footpath of finished silk raw material, for the electric hammer drill of M8; the line footpath of finished silk is 11.5mm; the outer round surface of finished silk has phosphate coating 4, and cut-off port does not has phosphate coating 4 to protect, as shown in Figure 1 up and down;4. pre-cold-heading operation is carried out, after pre-cold-heading, while finished silk epimere is upset, the lower end of finished silk forms bound edge reducing 5, and bound edge reducing 5 makes the metal of cut-off port under finished silk not exclusively expose, the port bore D of bound edge reducing 5 is less than the external diameter of the brill body body of rod (i.e. finished silk hypomere) after first cold-heading molding operation, for the electric hammer drill of M8, after pre-cooled upsetting operation, the external diameter of finished silk epimere is 11.55mm, the port bore D of bound edge reducing 5 is 7.01mm, as shown in Figure 2;5. first cold-heading molding operation, the epimere of finished silk raw material is upset, and the hypomere of finished silk is carefully elongated by upsetting, for the electric hammer drill of M8, after first cold-heading molding operation, the external diameter of finished silk epimere is 11.7mm, the external diameter of finished silk hypomere is 7.27mm, as shown in Figure 3;6. second cold-heading molding operation, for the electric hammer drill of M8, after second cold-heading molding operation, the external diameter of finished silk epimere is 11.7mm, and the external diameter of finished silk hypomere is 7.27mm, as shown in Figure 4;7. the 3rd road cold-heading molding operation, for the electric hammer drill of M8, after the 3rd road cold-heading molding operation, the external diameter of finished silk epimere is 11.88mm, and the external diameter of finished silk hypomere is 7.27mm, as shown in Figure 5;8. the 4th road cold-heading molding operation, for the electric hammer drill of M8, after the 4th road cold-heading molding operation, the external diameter of finished silk epimere is 11.87mm, the external diameter of finished silk hypomere is 7.27mm, i.e. the drillstock body of rod 1 of electric hammer drill cold-heading part and the brill body body of rod 3 molding, as shown in Figure 6.

Claims (2)

1. electric hammer drill cold-heading part moulding process, including 4-5 road cold-heading molding operation, the epimere of finished silk raw material is upset the drillstock body of rod forming electric hammer drill cold-heading part, the hypomere of finished silk is carefully formed the brill body body of rod of electric hammer drill cold-heading part by upsetting, it is characterised in that also include following forming step before first cold-heading molding operation: 1. finished silk raw material line footpath after drawing is less than the described drillstock body of rod more than external diameter 0.35mm;2. finished silk raw material is through surface granosealing;3. finished silk raw material is carried out pre-cooling upsetting operation after customized cut-off, and the lower end at finished silk forms bound edge reducing, and the port bore of bound edge reducing is less than the brill body body of rod external diameter after first cold-heading molding operation.
2. electric hammer drill cold-heading part moulding process as claimed in claim 1, it is characterised in that the difference of the brill body body of rod external diameter after the port bore of described bound edge reducing and first cold-heading molding operation controls at more than 0.15mm.
CN201610208184.XA 2016-04-06 2016-04-06 Electric hammer drill cold-heading part moulding process CN105710266B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610208184.XA CN105710266B (en) 2016-04-06 2016-04-06 Electric hammer drill cold-heading part moulding process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610208184.XA CN105710266B (en) 2016-04-06 2016-04-06 Electric hammer drill cold-heading part moulding process

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CN105710266A true CN105710266A (en) 2016-06-29
CN105710266B CN105710266B (en) 2017-07-25

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63224835A (en) * 1987-03-11 1988-09-19 Sumitomo Metal Ind Ltd Necking method for tubular product
CN101100027A (en) * 2006-07-07 2008-01-09 唐建军 Petroleum drilling rod joint extrusion forming technology method
CN201168760Y (en) * 2007-11-21 2008-12-24 罗至典 Forging machine producing fixed length heat pipe choke
CN102581211A (en) * 2012-02-02 2012-07-18 哈尔滨飞机工业集团有限责任公司 Cold forming method for integral aluminum alloy pull rod of aircraft
JP2012171016A (en) * 2011-02-24 2012-09-10 Jkb:Kk Method of working sharp edge
US20130091991A1 (en) * 2011-10-15 2013-04-18 Yu-Jyun Lee Method for Making a Bit of a Tool
CN103358100A (en) * 2013-07-26 2013-10-23 江南工业集团有限公司 Forging and molding process method for titanium alloy tubular piece
CN105057974A (en) * 2015-07-16 2015-11-18 江苏龙城精锻有限公司 Manufacturing process of rotor spindle cold heading blank for automobile generator

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63224835A (en) * 1987-03-11 1988-09-19 Sumitomo Metal Ind Ltd Necking method for tubular product
CN101100027A (en) * 2006-07-07 2008-01-09 唐建军 Petroleum drilling rod joint extrusion forming technology method
CN201168760Y (en) * 2007-11-21 2008-12-24 罗至典 Forging machine producing fixed length heat pipe choke
JP2012171016A (en) * 2011-02-24 2012-09-10 Jkb:Kk Method of working sharp edge
US20130091991A1 (en) * 2011-10-15 2013-04-18 Yu-Jyun Lee Method for Making a Bit of a Tool
CN102581211A (en) * 2012-02-02 2012-07-18 哈尔滨飞机工业集团有限责任公司 Cold forming method for integral aluminum alloy pull rod of aircraft
CN103358100A (en) * 2013-07-26 2013-10-23 江南工业集团有限公司 Forging and molding process method for titanium alloy tubular piece
CN105057974A (en) * 2015-07-16 2015-11-18 江苏龙城精锻有限公司 Manufacturing process of rotor spindle cold heading blank for automobile generator

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