Clamp for machining rivet core rod and machining lathe for rivet core rod

Abstract

The utility model discloses a fixture for processing a rivet core rod and a lathe for processing the rivet core rod, the fixture is provided with a length control section and a clamping section along the axial direction of the fixture, the length control section is provided with an adjusting cavity and a clamping inlet, the clamping section is provided with a clamping cavity and a clamping outlet which are communicated with the adjusting cavity, and the inner diameter of the clamping cavity is smaller than that of the adjusting cavity; the clamp is provided with a plurality of notch grooves, the notch grooves extend to the clamping inlet of the clamping section from the length control section in the axial direction of the clamp and are formed in the radial direction of the clamp in a penetrating mode, the notch grooves are distributed in the circumferential direction of the clamp at intervals, and therefore a plurality of elastic clamping arms are formed among the notch grooves. According to the utility model, the clamp is clamped and fixed on the chuck of the lathe, and the clamped position of the rivet pulling core rod is adjusted by adjusting the length of the rivet pulling core rod extending into the adjusting cavity, so that the clamping is stable, the slipping or thread overpressure deformation in the machining process is avoided, and the clamp is suitable for clamping and fixing the rivet pulling core rods with different lengths; and the rivet pulling core rod within a diameter range can be clamped.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical part processing technical field, in particular to a kind of clamp and draw core rod processing lathe for draw core rod processing. BACKGROUND

[0002] Core rivet is a commonly used connecting fastener, generally including draw core rod, nail body and nail cover, when using, first, the assembled draw core rivet is inserted into the preset rivet hole, then draw core rod is drawn out, the nail cover is deformed, and the big foot is formed, so as to be locked, and the draw core rod is broken from the neck slot.

[0003] At present, the slender rod such as draw core rod is mainly processed by ordinary lathe, and the common clamping methods include the following three kinds: one is chuck and center cooperation clamping, but the clamping method is only suitable for single-piece small-batch slender rod processing; another is chuck, center and tool rest cooperation clamping, although the clamping method can process longer slender rod, but it is difficult to adjust for thinner slender rod.

[0004] The draw core rod needs to form a neck slot in the middle part of the draw core rod by turning, since the draw core rod has threads, after being clamped by the three-jaw chuck of the lathe, the clamping force is unstable, which leads to slipping of the draw core rod or deformation of the threads during turning, resulting in waste parts. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of clamp and draw core rod processing lathe for draw core rod processing, to solve the technical problem that draw core rod slips or thread overpressure deformation due to unstable clamping force when turning draw core rod at present.

[0006] The above-mentioned purposes of the utility model can be realized by the following technical solutions:

[0007] The utility model provides a kind of clamp for draw core rod processing, the clamp is provided with length control section and clamping section along its axial direction, the length control section is provided with adjusting cavity and the clamping entrance being communicated with one end of the adjusting cavity, the clamping section is provided with the clamping cavity being communicated with the other end of the adjusting cavity and the clamping exit being communicated with the other end of the clamping cavity, and the inner diameter of the clamping cavity is less than the inner diameter of the adjusting cavity;The clamp is provided with multiple notched grooves, the notched groove extends to the clamping exit of the clamping section along the axial direction of the clamp from the length control section and is arranged through along the radial direction of the clamp, and multiple notched grooves are arranged at intervals along the circumferential direction of the clamp, so that multiple elastic clamping arms are formed between multiple notched grooves.

[0008] The outer wall surface of the clamping section is provided with a positioning step structure, and the positioning step structure is used for abutting against the end surface of the entry end of the chuck of the lathe to realize axial positioning of the clamp.

[0009] In the embodiment of the utility model, the positioning step structure has a positioning step surface and an outer end surface arranged oppositely in the axial direction of the clamp, the positioning step surface is used for abutting against the end surface of the entry end of the chuck of the lathe, and the outer end surface is arranged flush with the end surface of the clamping section around the clamping entry.

[0010] In the embodiment of the utility model, the length control section is provided with a plurality of anti-cracking arc-shaped holes corresponding to a plurality of notch grooves.

[0011] In the embodiment of the utility model, the width of the notch groove is 1mm-1.5mm, and the inner diameter of the anti-cracking arc-shaped hole is 2.5mm-3.5mm.

[0012] In the embodiment of the utility model, the number of the elastic clamping arms is three.

[0013] In the embodiment of the utility model, the outer diameter of the clamping section is greater than the outer diameter of the length control section; the inner wall surface of the clamping section has an inner clamping surface capable of clamping the extracted nail core rod to be machined, the inner diameter of the inner clamping surface is smaller than the diameter of the head boss of the extracted nail core rod, the inner diameter of the length control section is greater than the diameter of the head boss of the extracted nail core rod to be machined, and the inner wall surface of the length control section is connected with the inner clamping surface through a tapered surface arranged in a tapering manner.

[0014] In the embodiment of the utility model, the outer wall surface of the clamping section has an outer clamping surface capable of being clamped by the chuck of the lathe; the length of the outer clamping surface is 7mm-12mm; and the length of the length control section is 13mm-18mm.

[0015] In the embodiment of the utility model, the clamp is of an integral forming structure, and the material of the clamp is 65Mn steel.

[0016] The utility model also provides an extracted nail core rod machining lathe, which comprises the clamp, is provided with a chuck, and the clamp is clamped and fixed on the chuck.

[0017] The utility model has the characteristics and advantages that:

[0018] The utility model discloses a clamp and draw nail core rod processing lathe for draw nail core rod processing, through the chuck of clamp clamping fixed in lathe, the one end of the draw nail core rod of processing in proper order from the clamping entrance of clamp passes through the adjusting cavity of length control section and the clamping cavity of clamping section and then extends from the clamping exit of clamp, and through the length of draw nail core rod extending the clamping exit, can adjust the position of draw nail core rod being clamped by the multiple elastic clamping arms of clamping section, to ensure that draw nail core rod is clamped stably, avoids draw nail core rod slipping or thread overpressure deformation in the processing, and can be applicable to the clamping fixation of draw nail core rod of different lengths, in addition, utilizes multiple elastic clamping arms and multiple notched slots cooperation to make draw nail core rod in the diameter range all can be clamped without being limited to clamping draw nail core rod of certain diameter. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be briefly introduced the drawing needed to be used in the embodiment description, obviously, the drawing in the following description only is some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0020] Figure 1 It is the perspective view of the clamp of the utility model.

[0021] Figure 2 It is the local longitudinal section view of the clamp of the utility model.

[0022] Figure 3 It is the structure schematic view of the clamping entrance of the clamp of the utility model.

[0023] Figure 4 It is the structure schematic view of the clamp of the utility model being installed on the chuck.

[0024] Figure 5 It is the local longitudinal section view of the clamp of the utility model being installed on the chuck.

[0025] In the drawing:

[0026] 1, clamp; 11, clamping section; 111, clamping cavity; 112, clamping exit; 113, outer clamping surface; 114, inner clamping surface; 115, taper surface; 12, length control section; 121, adjusting cavity; 122, clamping entrance; 13, elastic clamping arm; 14, notched groove; 15, positioning step structure; 151, positioning step surface; 152, outer end surface; 153, positioning block; 16, anti-cracking arc hole;

[0027] 2, chuck; 21, claw;

[0028] 3, draw nail core rod; 31, head boss. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] Embodiment one

[0031] As shown in Figure 1 , Figure 2 and Figure 3 , the utility model provides a kind of clamp 1 for extracting nail core rod processing, clamp 1 is provided with length control section 12 and clamping section 11 along its axial direction, length control section 12 is provided with adjusting cavity 121 and the clamping entrance 122 being communicated with one end of adjusting cavity 121, clamping section 11 is provided with the clamping cavity 111 being communicated with the other end of adjusting cavity 121 with one end and the clamping exit 112 being communicated with the other end of clamping cavity 111, the inner diameter of clamping cavity 111 is less than the inner diameter of adjusting cavity 121;Clamp 1 is provided with multiple notched grooves 14, notched groove 14 is extended to the clamping exit 112 of clamping section 11 from length control section 12 along the axial direction of clamp 1 and is arranged along the radial direction of clamp 1, and multiple notched grooves 14 are arranged at intervals along the circumferential direction of clamp 1, so that multiple notched grooves 14 form multiple elastic clamping arms 13.

[0032] As shown in Figure 4 and Figure 5 , the clamp 1 for extracting nail core rod processing of the utility model is clamped and fixed on chuck 2 of lathe, one end of the extracting nail core rod 3 to be processed is sequentially passed through the adjusting cavity 121 of length control section 12 and the clamping cavity 111 of clamping section 11 from the clamping entrance 122 of clamp 1 and then extends out from the clamping exit 112 of clamp 1, and by adjusting the length of extracting nail core rod 3 extending out of clamping exit 112, the position of extracting nail core rod 3 clamped by multiple elastic clamping arms 13 at clamping section 11 can be adjusted, so as to ensure that extracting nail core rod 3 is stably clamped, avoid slipping or thread overpressure deformation of extracting nail core rod 3 in the processing process, and can be suitable for clamping and fixing of extracting nail core rod 3 within a length range, in addition, by using the cooperation of multiple elastic clamping arms 13 and multiple notched grooves 14, extracting nail core rod 3 within a diameter range can be clamped without being limited to clamping extracting nail core rod 3 of a specific diameter.

[0033] After extracting nail core rod 3 is clamped and fixed by the clamp 1 of the utility model for processing, the roundness of extracting nail core rod 3 is improved to below 0.05mm, and the diameter runout of the processing part is greatly reduced, and the diameter tolerance of extracting nail core rod 3 is controlled to below 0.05mm.

[0034] The diameter range of the clamp 1 is not particularly limited, is related to the inner diameter of the clamping cavity 111, and is of course also related to the elasticity of the elastic clamping arms 13, and the elasticity of the elastic clamping arms 13 is related to the width of the notch groove 14, the length of the notch groove 14 and the thickness of the elastic clamping arms 13.

[0035] The outer wall surface of the clamping section 11 has an outer clamping surface 113 that can be clamped by the chuck of the lathe, and the mounting stability of the clamp 1 is related to the length of the outer clamping surface 113; the inner wall surface of the clamping section 11 has an inner clamping surface 114 that can be clamped to the to-be-processed draw nail core rod 3, and the clamping stability of the draw nail core rod 3 is also related to the length of the inner clamping surface 114. The length range of the clamp 1 of the utility model is also not particularly limited, and is related to the length of the adjusting cavity 121 and the length of the inner clamping surface 114. The length of the adjusting cavity 121 is similar to the length L2 of the length control section 12, and the length of the inner clamping surface 114 is similar to the length of the outer clamping surface 113. In the embodiment, the length L1 of the outer clamping surface 113 is 7mm-12mm, and the length L2 of the length control section 12 is 13mm-18mm.

[0036] Specifically, in combination with the drawings shown in Figure 2 and Figure 5 , the diameter of the rod part of the to-be-processed draw nail core rod 3 can be equal to, slightly smaller than or slightly larger than the inner diameter of the clamping cavity 111, so that the draw nail core rod 3 can be clamped by each elastic clamping arm 13 or tightly clamped with the inner wall surface of the clamping section 11 (i.e. the inner side surface of each elastic clamping arm 13 located at the clamping section 11) in cooperation with the chuck 2. The first end of the draw nail core rod 3 is provided with a head boss 31, the diameter of the head boss 31 is greater than the diameter of the rod part of the draw nail core rod 3, and the second end of the draw nail core rod 3 extends out of the clamping outlet 112 of the clamp 1 after sequentially passing through the adjusting cavity 121 of the length control section 12 and the clamping cavity 111 of the clamping section 11 from the clamping inlet 122 of the clamp 1. The inner diameter of the inner clamping surface 114 is smaller than the diameter of the head boss 31 of the draw nail core rod 3, so as to avoid the head boss 31 being clamped by the inner clamping surface 114, and the inner diameter of the length control section 12 is greater than the diameter of the head boss 31 of the draw nail core rod 3, that is, the head boss 31 of the draw nail core rod 3 and the inner wall surface of the length control section 12 have a gap, so as to facilitate the draw nail core rod 3 to adjust the position of being clamped along the axial direction thereof. In the embodiment, the clamp 1 is an integral forming structure, and the material of the clamp 1 is 65Mn steel, so that the clamp 1 has the advantages of high strength, high hardness and good elasticity after heat treatment.

[0037] In addition, the inner wall surface of the clamping section 11 also has a conical surface 115. The inner wall surface of the length control section 12 is connected to the inner clamping surface 114 through the tapered conical surface 115, so that while the pin-pulling core rod 3 is clamped by the inner clamping surface 114, the head boss 31 of the pin-pulling core rod 3 can abut against the conical surface 115, thereby further improving the stability of the pin-pulling core rod 3.

[0038] Combination Figure 2 and Figure 5 As shown in the embodiment of this utility model, the outer wall surface of the clamping section 11 is provided with a positioning step structure 15. The positioning step structure 15 is used to abut against the end face of the inlet end of the lathe chuck 2 to achieve axial positioning of the fixture 1. When installing the fixture 1, the end of the length control section 12 away from the clamping section 11 is extended into the chuck 2 along the axial direction of the fixture 1 from the inlet end of the chuck 2 until the positioning step structure 15 abuts against the end face of the inlet end of the chuck 2, and then the fixture 1 is clamped and fixed by the chuck 2.

[0039] Specifically, the positioning step structure 15 has a positioning step surface 151 and an outer end face 152 arranged opposite to each other in the axial direction of the fixture 1. The positioning step surface 151 is used to abut against the end face of the inlet end of the lathe chuck 2. The outer end face 152 is flush with the end face of the clamping section 11 located around the clamping outlet 112, which facilitates processing and allows the clamping section 11 to extend into the chuck 2 as much as possible, which is beneficial to the stable installation of the clamping section 11 under the clamping of the chuck 2, thereby improving the stability of the clamping section 11 clamping the pull pin core rod 3. Among them, the positioning step surface 151 is a plane. The positioning step structure 15 includes multiple positioning blocks 153, which are correspondingly arranged on the outer side surface of multiple elastic clamping arms 13.

[0040] like Figure 1 and Figure 5 As shown, in this embodiment of the invention, the length control section 12 is provided with multiple anti-crack arc-shaped holes 16 corresponding to and communicating with multiple notch slots 14. This prevents the connection between adjacent elastic clamping arms 13 from cracking when subjected to greater pressure, thereby improving the service life of the clamp 1 and also increasing the clamping range of the clamp 1. The anti-crack arc-shaped holes 16 are not limited to the circular holes in this embodiment; they can also be elliptical holes, oblong holes, or other holes with a rounded transition surface on their inner wall. Specifically, the width of the notch slot 14 is 1mm to 1.5mm, and the inner diameter of the anti-crack arc-shaped hole 16 is 2.5mm to 3.5mm.

[0041] like Figure 3 and Figure 5As shown, in this embodiment, the number of elastic clamping arms 13 is three, to better adapt to the three-jaw chuck (i.e., the chuck 2 with three jaws 21). Of course, the number of elastic clamping arms 13 can also be set to other numbers according to the number of jaws 21 on the chuck 2, and can also be different from the number of jaws 21 on the chuck 2.

[0042] like Figure 2 and Figure 5 As shown, in this embodiment of the invention, the outer diameter of the clamping section 11 is larger than the outer diameter of the length control section 12. Multiple jaws 21 of the chuck 2 cooperate to form a connected mounting cavity and a receiving cavity. The mounting cavity is located near the inlet end of the chuck 2. The length control section 12 is placed in the receiving cavity, and the clamping section 11 is placed in the mounting cavity. The outer clamping surface 113 of the clamping section 11 is held in close contact by the multiple jaws 21, further improving the stability of the pin-pulling core rod 3. Furthermore, because the inner diameter of the clamping cavity 111 is smaller than the inner diameter of the adjusting cavity 121, and the outer diameter of the clamping section 11 is larger than the outer diameter of the length control section 12, the wall thickness of the clamping section is greater than the wall thickness of the length control section 12. This ensures the structural strength of the clamping section, saves materials, reduces manufacturing costs, and maintains the elasticity of each elastic clamping arm 13.

[0043] Implementation Method 2

[0044] Combination Figure 4 and Figure 5 As shown, this utility model also provides a peg-pulling mandrel processing lathe, including a fixture 1. The peg-pulling mandrel processing lathe is equipped with a chuck 2, and the fixture 1 is clamped and fixed on the chuck 2. In this embodiment, the fixture 1 has the same specific structure, working principle and beneficial effects as the fixture 1 in embodiment one, and will not be described again here.

[0045] The above descriptions are merely a few embodiments of this utility model. Those skilled in the art can make various modifications or variations to the embodiments of this utility model based on the content disclosed in the application documents without departing from the spirit and scope of this utility model.

Claims

1. A clamp for machining of a core rod of a draw nail, characterized in that the clamp is provided with a length control section and a clamping section along an axial direction of the clamp, the length control section is provided with an adjusting cavity and a clamping inlet connected to one end of the adjusting cavity, the clamping section is provided with a clamping cavity connected to the other end of the adjusting cavity and a clamping outlet connected to the other end of the clamping cavity, and an inner diameter of the clamping cavity is smaller than an inner diameter of the adjusting cavity.

2. The clamp for machining of a core rod of a draw nail according to claim 1, characterized in that an outer wall surface of the clamping section is provided with a positioning step structure for abutting against an end surface of an inlet end of a chuck of a lathe to realize axial positioning of the clamp.

3. The clamp for machining of a core rod of a draw nail according to claim 2, characterized in that the positioning step structure has a positioning step surface and an outer end surface arranged oppositely along the axial direction of the clamp, the positioning step surface is used for abutting against the end surface of the inlet end of the chuck of the lathe, and the outer end surface is arranged flush with an end surface of the clamping section around the clamping outlet.

4. The clamp for machining of a core rod of a draw nail according to claim 1, characterized in that the length control section is provided with a plurality of anti-cracking arc-shaped holes corresponding to the plurality of notch grooves.

5. The clamp for machining of a core rod of a draw nail according to claim 4, characterized in that a width of the notch groove is 1mm-1.5mm, and an inner diameter of the anti-cracking arc-shaped hole is 2.5mm-3.5mm.

6. The clamp for machining of a core rod of a draw nail according to claim 1, characterized in that the number of the elastic clamping arms is three.

7. The clamp for machining of a core rod of a draw nail according to claim 1, characterized in that an outer diameter of the clamping section is greater than an outer diameter of the length control section, an inner wall surface of the clamping section has an inner clamping surface capable of clamping a core rod of a draw nail to be machined, an inner diameter of the inner clamping surface is smaller than a diameter of a head boss of the core rod of the draw nail, an inner diameter of the length control section is greater than the diameter of the head boss of the core rod of the draw nail, and an inner wall surface of the length control section is connected to the inner clamping surface through a tapered surface arranged gradually.

8. The clamp for machining of a core rod of a draw nail according to claim 1, characterized in that an outer wall surface of the clamping section has an outer clamping surface capable of being clamped by a chuck of a lathe, a length of the outer clamping surface is 7mm-12mm, and a length of the length control section is 13mm-18mm.

9. The clamp for machining of a core rod of a draw nail according to claim 1, characterized in that the clamp is an integrally formed structure, and a material of the clamp is 65Mn steel. The clamp for machining of a core rod of a draw nail according to any one of claims 1-9, a draw nail machining lathe is provided with a chuck, and the clamp is clamped and fixed on the chuck. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 10. A draw core rod processing lathe characterized by, ​

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